阅读说明：本技术 含氧化锌设备的防爆测试方法及装置、设计方法及装置 (Explosion-proof test method and device, design method and device for equipment containing zinc oxide ) 是由 王博闻 陆佳政 方针 蒋正龙 胡建平 彭永晶 于 2020-04-08 设计创作，主要内容包括：本发明公开了一种含氧化锌设备的防爆测试方法及装置、设计方法及装置,含氧化锌设备包括氧化锌电阻片,测试方法包括控制冲击电流发生器向氧化锌电阻片通入不同的冲击电流；获取不同的冲击电流下,氧化锌电阻片破坏时产生的电阻片碎片的冲击强度,以及氧化锌电阻片破坏时含氧化锌设备内部压缩空气的最大压强；根据冲击强度和最大压强获取不同的冲击电流下,氧化锌电阻片破坏时产生的最大冲击强度。通过本发明的技术方案,测试过程有效模拟了氧化锌电阻片的破坏过程,提升了防爆试验的真实性和试验效率,提高了防爆试验的经济性,并有效指导了含氧化锌设备的防爆结构的设计。(The invention discloses an explosion-proof test method and device, a design method and a device for zinc oxide-containing equipment, wherein the zinc oxide-containing equipment comprises a zinc oxide resistance card; acquiring the impact strength of resistance card fragments generated when the zinc oxide resistance card is damaged under different impact currents and the maximum pressure of compressed air in zinc oxide-containing equipment when the zinc oxide resistance card is damaged; and obtaining the maximum impact strength generated when the zinc oxide resistance card is damaged under different impact currents according to the impact strength and the maximum pressure. According to the technical scheme, the test process effectively simulates the damage process of the zinc oxide resistance card, the authenticity and the test efficiency of the explosion-proof test are improved, the economy of the explosion-proof test is improved, and the design of the explosion-proof structure of the zinc oxide-containing equipment is effectively guided.)

1. An explosion-proof test method of zinc oxide-containing equipment, which is characterized in that the zinc oxide-containing equipment comprises a zinc oxide resistor chip, and the test method comprises the following steps:

controlling a surge current generator to supply different surge currents to the zinc oxide resistance chip;

acquiring the impact strength of resistor chip generated when the zinc oxide resistor chip is damaged under different impact currents;

acquiring the maximum pressure of compressed air in the zinc oxide-containing equipment when the zinc oxide resistance card is damaged under different impact currents;

and acquiring the maximum impact strength generated when the zinc oxide resistance card is damaged under different impact currents according to the impact strength and the maximum pressure.

2. The test method according to claim 1, wherein the controlling the surge current generator to apply different surge currents to the zinc oxide resistor sheet comprises:

acquiring the maximum lightning current of the equipment containing zinc oxide;

and controlling the impulse current which is introduced into the zinc oxide resistance chip by the impulse current generator to be changed from the set current of the resistance chip to the maximum lightning current.

3. The test method of claim 1, wherein the obtaining of the impact strength of the fragments of the zinc oxide resistor disc generated when the zinc oxide resistor disc is damaged under different impact currents comprises:

acquiring the speed of resistor chip generated when the zinc oxide resistor chip is damaged under different impact currents;

and acquiring the impact strength of the fragments of the zinc oxide resistance card generated when the zinc oxide resistance card is damaged according to the speed.

4. The test method according to claim 3, wherein the speed of the fragments of the zinc oxide resistor disc generated when the resistor disc is damaged satisfies the following formula:

wherein v is the speed of the resistance card fragments generated when the zinc oxide resistance card is damaged, and d is t₁The distance the resistor disc fragments move in time;

the impact strength of the fragments of the zinc oxide resistor disc generated when the zinc oxide resistor disc is damaged meets the following formula:

wherein, P₁The impact strength of the resistance card fragments generated when the zinc oxide resistance card is damaged, m is the mass of the resistance card fragments, t₂And S is the area of the resistor chip perpendicular to the velocity direction of the resistor chip.

5. The test method of claim 1, wherein the obtaining of the maximum pressure of the compressed air inside the zinc oxide-containing device when the zinc oxide resistor disc is damaged under different impact currents comprises:

acquiring the maximum temperature rise generated when the zinc oxide resistance card is damaged under different impact currents;

and acquiring the maximum pressure of the compressed air in the zinc oxide-containing equipment when the zinc oxide resistance card is damaged according to the maximum temperature rise.

6. The test method according to claim 5, wherein the maximum pressure of the compressed air inside the zinc oxide-containing equipment satisfies the following formula:

wherein, P₂The maximum pressure of the compressed air in the zinc oxide-containing equipment is defined, n is the amount of substances of the compressed air in the zinc oxide-containing equipment, R is a constant, T is the temperature rise generated when the zinc oxide resistor disc is broken, and V is the volume of the compressed air in the zinc oxide-containing equipment.

7. The test method according to claim 1, wherein the obtaining of the maximum impact strength generated when the zinc oxide resistor disc is broken under different impact currents according to the impact strength and the maximum pressure comprises:

and taking the sum of the maximum value of the impact strength and the maximum pressure corresponding to the same impact current as the maximum impact strength generated when the zinc oxide resistance card corresponding to the impact current is damaged.

8. An explosion-proof design method of zinc oxide-containing equipment is characterized by comprising the following steps:

acquiring rupture critical current of a zinc oxide resistance card forming the zinc oxide-containing equipment and maximum lightning current of the zinc oxide-containing equipment;

the test method according to any one of claims 1-7, obtaining the maximum impact strength corresponding to the rupture critical current and the maximum impact strength corresponding to the maximum lightning strike current;

and acquiring the notch intensity of an explosion-proof groove in an explosion-proof structure according to the maximum impact intensity corresponding to the rupture critical current and the maximum impact intensity corresponding to the maximum lightning strike current.

9. The design method of claim 8, further comprising:

obtaining the maximum length of the maximum resistor chip generated when the zinc oxide resistor chip is damaged;

and acquiring the size of the notch of the explosion-proof groove in the explosion-proof structure according to the maximum length.

10. The design method according to claim 8, further comprising, after obtaining notch strength of an explosion-proof slot in the explosion-proof structure according to the maximum impact strength corresponding to the rupture critical current and the maximum impact strength corresponding to the maximum lightning strike current:

testing the sealing performance of the zinc oxide-containing equipment after the mechanical load is set;

and adjusting the design value of the notch strength of the explosion-proof groove in the explosion-proof structure according to the test result of the sealing performance.

11. An explosion-proof testing arrangement who contains zinc oxide equipment which characterized in that includes:

the explosion-proof cover is used for placing zinc oxide resistance cards forming the zinc oxide-containing equipment;

two output ends of the surge current generator are respectively and electrically connected with two ends of the zinc oxide resistance chip;

the shooting component is used for monitoring the damage process of the zinc oxide resistance card in the explosion-proof cover;

the temperature monitoring component is used for monitoring the temperature rise in the explosion-proof cover;

a controller electrically connected to the inrush current generator, the temperature monitoring part and the photographing part, respectively, for performing the test method according to any one of claims 1 to 7.

12. The testing device of claim 11, further comprising:

the current induction component is arranged corresponding to the discharge end of the zinc oxide resistance card and is used for acquiring the discharge current of the zinc oxide resistance card;

and the wave recording component is electrically connected with the current induction component and the shooting component and is used for triggering the shooting component to work according to the discharge current.

13. The testing device of claim 11, further comprising:

the upper electrode plate and the lower electrode plate are positioned in the explosion-proof cover, the upper electrode plate and the lower electrode plate are respectively positioned on two sides of the zinc oxide resistance chip, and the upper electrode plate and the lower electrode plate are used for fixing the zinc oxide resistance chip;

and the surge current generator leads surge current to the zinc oxide resistance card through the upper electrode plate and the lower electrode plate.

14. An explosion-proof design device of zinc oxide equipment, characterized by comprising:

the current acquisition module is used for acquiring rupture critical current of a zinc oxide resistance card forming the zinc oxide-containing equipment and the maximum lightning current of the zinc oxide-containing equipment;

an impact strength acquisition module for acquiring the maximum impact strength corresponding to the rupture critical current and the maximum impact strength corresponding to the maximum lightning strike current according to the test method of any one of claims 1 to 7;

and the notch intensity acquisition module is used for acquiring the notch intensity of an explosion-proof groove in an explosion-proof structure according to the maximum impact intensity corresponding to the rupture critical current and the maximum impact intensity corresponding to the maximum lightning current.

Technical Field

The embodiment of the invention relates to the technical field of electrical engineering, in particular to an explosion-proof test method and device, a design method and a design device for zinc oxide-containing equipment.

Background

The zinc oxide resistance card is a core component of lightning protection equipment, and is widely applied to power systems due to excellent nonlinear characteristics and tolerance capability. Under normal voltage, the zinc oxide resistance chip is a high-resistance resistor and plays an insulating role, under the lightning overvoltage, the zinc oxide resistance chip is converted into a low-resistance resistor, large current flows through the zinc oxide resistance chip to be released to the ground, after the lightning overvoltage, the resistance value of the zinc oxide resistance chip is rapidly recovered, and the circuit is recovered to be insulated. When the impact current exceeds the bearing value of the zinc oxide resistance chip, the zinc oxide resistance chip can have the phenomena of thermal collapse, thermal perforation, even fracture and the like. Once the zinc oxide resistance card is cracked, the fragments of the resistance card form impact force, and the structure is damaged, so that the safe operation of the lightning protection equipment is influenced.

At present, the impact stress generated by the damage of the zinc oxide resistor disc can be released by designing a notch with a thinner thickness on the inner epoxy barrel, namely, a plurality of pressure release ports are formed by utilizing the thinner notch. However, the mechanical stress of the epoxy structure is reduced due to the designed thickness of the notches, the inner notches are easy to break under windage or electrodynamic force, and external moisture enters the inner resistor disc to cause the resistor disc to be affected with damp and fail. The too big stress that can lead to resistance card destruction production of thickness of notch design can't obtain the release in the very first time, and under the electric arc sustained combustion, the inside a large amount of gases that produce of lightning protection equipment probably leads to the overall structure of lightning protection equipment to destroy violently, and burning can appear in the inside material under lasting high temperature, influences lightning protection equipment and personnel's safety. The current standard requires to carry out explosion-proof performance test to the lightning protection equipment body, analyzes the explosion-proof performance of the lightning protection equipment, but can not obtain the impact effect to the structure under the destruction of the zinc oxide resistance card in the test, can only simply judge whether to pass through, and has weak significance to the design guidance of the explosion-proof structure, and the single cost of the explosion-proof test is high, and if the explosion-proof structure performance is verified through a plurality of tests, the economy is weak.

Disclosure of Invention

In view of the above, the invention provides a method and a device for testing an explosion-proof structure of zinc oxide-containing equipment, and a method and a device for designing the explosion-proof structure of the zinc oxide-containing equipment, wherein the testing process effectively simulates the damage process of a zinc oxide resistance card, so that the authenticity and the testing efficiency of an explosion-proof test are improved, the economy of the explosion-proof test is improved, and the design of the explosion-proof structure of the zinc oxide-containing equipment is effectively guided.

In a first aspect, an embodiment of the present invention provides an explosion-proof test method for a device containing zinc oxide, where the device containing zinc oxide includes a zinc oxide resistor disc, and the test method includes:

controlling a surge current generator to supply different surge currents to the zinc oxide resistance chip;

acquiring the impact strength of resistor chip generated when the zinc oxide resistor chip is damaged under different impact currents;

acquiring the maximum pressure of compressed air in the zinc oxide-containing equipment when the zinc oxide resistance card is damaged under different impact currents;

and acquiring the maximum impact strength generated when the zinc oxide resistance card is damaged under different impact currents according to the impact strength and the maximum pressure.

Optionally, the controlling the surge current generator to apply different surge currents to the zinc oxide resistor disc includes:

acquiring the maximum lightning current of the equipment containing zinc oxide;

and controlling the impulse current which is introduced into the zinc oxide resistance chip by the impulse current generator to be changed from the set current of the resistance chip to the maximum lightning current.

Optionally, the obtaining of the impact strength of the fragments of the zinc oxide resistor disc generated when the zinc oxide resistor disc is damaged under different impact currents includes:

acquiring the speed of resistor chip generated when the zinc oxide resistor chip is damaged under different impact currents;

and acquiring the impact strength of the fragments of the zinc oxide resistance card generated when the zinc oxide resistance card is damaged according to the speed.

Optionally, the speed of the fragments of the zinc oxide resistor disc generated when the resistor disc is damaged satisfies the following formula:

wherein v is the speed of the resistance card fragments generated when the zinc oxide resistance card is damaged, and d is t₁The distance the resistor disc fragments move in time;

the impact strength of the fragments of the zinc oxide resistor disc generated when the zinc oxide resistor disc is damaged meets the following formula:

wherein, P₁The impact strength of the resistance card fragments generated when the zinc oxide resistance card is damaged, m is the mass of the resistance card fragments, t₂And S is the area of the resistor chip perpendicular to the velocity direction of the resistor chip.

Optionally, the obtaining the maximum pressure of the compressed air inside the zinc oxide-containing device when the zinc oxide resistance card is damaged under different impact currents includes:

acquiring the maximum temperature rise generated when the zinc oxide resistance card is damaged under different impact currents;

and acquiring the maximum pressure of the compressed air in the zinc oxide-containing equipment when the zinc oxide resistance card is damaged according to the maximum temperature rise.

Optionally, the maximum pressure of the compressed air inside the zinc oxide-containing equipment satisfies the following formula:

wherein, P₂The maximum pressure of the compressed air in the zinc oxide-containing equipment is defined, n is the amount of substances of the compressed air in the zinc oxide-containing equipment, R is a constant, T is the temperature rise generated when the zinc oxide resistor disc is broken, and V is the volume of the compressed air in the zinc oxide-containing equipment.

Optionally, the obtaining of the maximum impact strength generated when the zinc oxide resistance card is damaged under different impact currents according to the impact strength and the maximum pressure includes:

and taking the sum of the maximum value of the impact strength and the maximum pressure corresponding to the same impact current as the maximum impact strength generated when the zinc oxide resistance card corresponding to the impact current is damaged.

In a second aspect, an embodiment of the present invention further provides an explosion-proof design method for a zinc oxide-containing device, including:

acquiring rupture critical current of a zinc oxide resistance card forming the zinc oxide-containing equipment and maximum lightning current of the zinc oxide-containing equipment;

obtaining the maximum impact strength corresponding to the rupture critical current and the maximum impact strength corresponding to the maximum lightning strike current according to the test method of the first aspect;

and acquiring the notch intensity of an explosion-proof groove in an explosion-proof structure according to the maximum impact intensity corresponding to the rupture critical current and the maximum impact intensity corresponding to the maximum lightning strike current.

Optionally, the design method further includes:

obtaining the maximum length of the maximum resistor chip generated when the zinc oxide resistor chip is damaged;

and acquiring the size of the notch of the explosion-proof groove in the explosion-proof structure according to the maximum length.

Optionally, after obtaining the notch strength of an explosion-proof slot in the explosion-proof structure according to the maximum impact strength corresponding to the rupture critical current and the maximum impact strength corresponding to the maximum lightning strike current, the method further includes:

testing the sealing performance of the zinc oxide-containing equipment after the mechanical load is set;

and adjusting the design value of the notch strength of the explosion-proof groove in the explosion-proof structure according to the test result of the sealing performance.

In a third aspect, an embodiment of the present invention further provides an explosion-proof testing apparatus including a zinc oxide device, including:

the explosion-proof cover is used for placing zinc oxide resistance cards forming the zinc oxide-containing equipment;

two output ends of the surge current generator are respectively and electrically connected with two ends of the zinc oxide resistance chip;

the shooting component is used for monitoring the damage process of the zinc oxide resistance card in the explosion-proof cover;

the temperature monitoring component is used for monitoring the temperature rise in the explosion-proof cover;

and the controller is electrically connected with the impact current generator, the temperature monitoring part and the shooting part respectively and is used for executing the test method in the first aspect.

Optionally, the testing apparatus further comprises:

the current induction component is arranged corresponding to the discharge end of the zinc oxide resistance card and is used for acquiring the discharge current of the zinc oxide resistance card;

and the wave recording component is electrically connected with the current induction component and the shooting component and is used for triggering the shooting component to work according to the discharge current.

Optionally, the testing apparatus further comprises:

the upper electrode plate and the lower electrode plate are positioned in the explosion-proof cover, the upper electrode plate and the lower electrode plate are respectively positioned on two sides of the zinc oxide resistance chip, and the upper electrode plate and the lower electrode plate are used for fixing the zinc oxide resistance chip;

and the surge current generator leads surge current to the zinc oxide resistance card through the upper electrode plate and the lower electrode plate.

In a fourth aspect, an embodiment of the present invention further provides an explosion-proof design apparatus for a zinc oxide-containing device, including:

the current acquisition module is used for acquiring rupture critical current of a zinc oxide resistance card forming the zinc oxide-containing equipment and the maximum lightning current of the zinc oxide-containing equipment;

an impact strength obtaining module, configured to obtain the maximum impact strength corresponding to the rupture critical current and the maximum impact strength corresponding to the maximum lightning strike current according to the test method according to the first aspect;

and the notch intensity acquisition module is used for acquiring the notch intensity of an explosion-proof groove in an explosion-proof structure according to the maximum impact intensity corresponding to the rupture critical current and the maximum impact intensity corresponding to the maximum lightning current.

The embodiment of the invention provides an explosion-proof test method and device and a design method and device for zinc oxide-containing equipment, wherein the zinc oxide-containing equipment comprises a zinc oxide resistance chip, different impact currents are controlled to be introduced into the zinc oxide resistance chip by an impact current generator to obtain the impact strength of resistance chip fragments generated when the zinc oxide resistance chip is damaged under different impact currents, and the maximum pressure of compressed air in the zinc oxide equipment when the zinc oxide resistance chip is damaged is obtained.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.

Fig. 1 is a schematic flow chart of an explosion-proof testing method for a zinc oxide-containing device according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an explosion-proof testing apparatus of a zinc oxide-containing device according to an embodiment of the present invention;

fig. 3 is a schematic flow chart of an explosion-proof design method of a zinc oxide-containing device according to an embodiment of the present invention;

fig. 4 is a schematic flow chart of a specific process of an explosion-proof design method of a zinc oxide-containing device according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of an explosion-proof design device of a zinc oxide-containing apparatus according to an embodiment of the present invention.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and examples. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.

Fig. 1 is a schematic flow chart of an explosion-proof testing method for a zinc oxide-containing device according to an embodiment of the present invention. The explosion-proof test method for the equipment containing the zinc oxide can be applied to a scene in which an explosion-proof structure containing the zinc oxide equipment, such as lightning protection equipment, needs to be tested, and can be executed by the explosion-proof test device for the equipment containing the zinc oxide provided by the embodiment of the invention. As shown in fig. 1, the explosion-proof test method of the zinc oxide-containing equipment comprises the following steps:

and S101, controlling the impulse current generator to supply different impulse currents to the zinc oxide resistance card.

In particular, the zinc oxide resistance card is a core component of equipment containing zinc oxide, such as lightning protection equipment, and the zinc oxide resistance card is widely applied to lightning protection of an electric power system due to excellent nonlinear characteristics and tolerance capability, and the zinc oxide resistance card is a high-resistance resistor under normal voltage and plays an insulating role. Under the lightning overvoltage, the zinc oxide resistance sheet is converted into a low resistance value, the large current flows through the zinc oxide resistance sheet and is released to the ground, after the lightning overvoltage, the resistance value of the zinc oxide resistance sheet is quickly recovered, and the circuit is recovered to be insulated.

When a large current flows through the resistor disc, a large amount of energy is generated in the resistor disc, the resistor disc generates heat and the like, and when the impact current exceeds the bearing value of the resistor disc, the resistor disc generates heat breakdown, hot perforation, cracking and the like. Once the crack occurs, the fragments of the resistance chip form impact force and damage the structure, thereby influencing safe operation. For example, a lightning protection device containing a zinc oxide resistor disc can cause the zinc oxide resistor disc to be damaged under a large lightning current, an electric arc cannot be reliably extinguished, the temperature of electric arc discharge reaches up to 2000 ℃, and a large amount of heat is released. When the local temperature of the electric arc acting on the surfaces of the epoxy resin fiber rod and the silicon rubber inside the lightning protection equipment exceeds 500 ℃, molecular chains on the surfaces are degraded and even gasified, the resistance card has an outward impact effect under the damage condition, the inside air also can be violently expanded at high temperature, and if the released inside pressure cannot be effectively released, the whole lightning protection equipment can be cracked, and the safety of nearby equipment and personnel is influenced.

Therefore, the impact current which is introduced into the zinc oxide resistance card by the impact current generator can be adjusted by controlling the impact current generator, so that the simulation of the damage process of the zinc oxide resistance card is realized. Optionally, before controlling the surge current generator to apply different surge currents to the zinc oxide resistance card, the zinc oxide resistance card is placed in a test device for the cracking performance of the zinc oxide resistance card, for example, the zinc oxide resistance card is placed in a transparent explosion-proof glass cover, and the transparent explosion-proof glass cover is also beneficial to observing the damage condition of the zinc oxide resistance card.

The method comprises the steps of controlling an impulse current generator to supply different impulse currents to a zinc oxide resistance card, obtaining the maximum lightning current of equipment containing zinc oxide, and then controlling the impulse current generator to supply the impulse current to the zinc oxide resistance card to change from the set current of the resistance card to the maximum lightning current. Specifically, the lightning positioning system is correspondingly arranged at the actual line of the zinc oxide-containing equipment, and the maximum lightning current amplitude near the actual line of the zinc oxide-containing equipment can be obtained through the lightning positioning system, namely the maximum lightning current which can be received by the zinc oxide-containing equipment can be obtained. The set current of the resistance card is smaller than the maximum lightning current, when the set current of the resistance card is led into the zinc oxide resistance card, the zinc oxide resistance card cannot damage and generate resistance card fragments, the maximum lightning current is led into the zinc oxide resistance card, the zinc oxide resistance card damages and generates the resistance card fragments, the impact current led into the zinc oxide resistance card by the impact current generator is controlled to change from the set current of the resistance card to the maximum lightning current, for example, the impact current can be set to gradually change from the set current of the resistance card to the maximum lightning current, and the process that the zinc oxide resistance card damages and generates the resistance card fragments can be accurately simulated.

And S102, acquiring the impact strength of the fragments of the zinc oxide resistance card generated when the zinc oxide resistance card is damaged under different impact currents.

And controlling the impulse current introduced to the zinc oxide resistance card by the impulse current generator to be changed from the set current of the resistance card to the maximum lightning current, and when the impulse current is increased to the critical impulse current corresponding to the rupture of the zinc oxide resistance card, the zinc oxide resistance card is destroyed to generate resistance card fragments, so as to obtain the impact strength of the resistance card fragments generated when the zinc oxide resistance card is destroyed under different impulse currents.

Alternatively, the impact strength of the fragments of the zinc oxide resistor disc generated when the zinc oxide resistor disc is damaged under different impact currents is obtained, the speed of the fragments of the zinc oxide resistor disc generated when the zinc oxide resistor disc is damaged under different impact currents can be obtained, and then the impact strength of the fragments of the zinc oxide resistor disc generated when the zinc oxide resistor disc is damaged can be obtained according to the speed of the fragments of the zinc oxide resistor disc generated when the zinc oxide resistor disc is damaged.

Specifically, the speed of the fragments of the zinc oxide resistor disc generated when the zinc oxide resistor disc is damaged is obtained under different impact currents, and the speed of the fragments of the zinc oxide resistor disc generated when the zinc oxide resistor disc is damaged meets the following formula:

wherein v is the velocity of the fragments of the zinc oxide resistor disc generated when the resistor disc is damaged, and d is t₁The distance the resistive patch fragments move in time. Specifically, the damage condition of the zinc oxide resistor disc in the explosion-proof cover can be observed by utilizing a shooting component, the shooting component can be a high-definition camera, the condition in the explosion-proof cover can be shot by utilizing the high-definition camera, and t can be set₁For the time interval between two adjacent pictures shot by the high-definition camera, d is the distance of resistance card fragments generated by the damage of the zinc oxide resistance card in the two adjacent pictures, and because the distance between the zinc oxide resistance card in the zinc oxide-containing equipment and the external epoxy barrel is generally less than 1mm, d can be set to be less than 1 mm.

Acquiring the speed of the fragments of the zinc oxide resistance card generated when the zinc oxide resistance card is damaged under different impact currents, and then acquiring the impact strength of the fragments of the zinc oxide resistance card generated when the zinc oxide resistance card is damaged according to the speed of the fragments of the zinc oxide resistance card generated when the zinc oxide resistance card is damaged, wherein the impact strength of the fragments of the zinc oxide resistance card generated when the zinc oxide resistance card is damaged meets the following formula:

wherein, P₁The impact strength of the fragments of the zinc oxide resistor disc generated when the zinc oxide resistor disc is damaged, m is the mass of the fragments of the resistor disc, t₂The time when the fragments of the resistor disc collide with the explosion-proof cover is S, and the area of the fragments of the resistor disc, which is perpendicular to the speed direction of the fragments of the resistor disc, is S. In particular, it can be passed through a balanceObtaining the mass m of resistor fragments generated by the damage of the zinc oxide resistor, taking pictures of the conditions in the explosion-proof cover by using a high-definition camera, and obtaining the time t of the resistor fragments colliding with the explosion-proof cover₂The area S of the resistor disc fragments perpendicular to the speed direction of the resistor disc fragments can be obtained by photographing through the high-definition camera, the speed v of the resistor disc fragments generated when the zinc oxide resistor disc fragments are damaged under the combination of the obtained different impact currents, and the impact strength value P of each surface of the resistor disc fragments generated when the zinc oxide resistor disc fragments are damaged can be obtained₁Namely, the impact strength of the fragments of the zinc oxide resistor disc generated when the zinc oxide resistor disc is damaged under different impact currents is obtained.

S103, obtaining the maximum pressure of the compressed air in the zinc oxide equipment when the zinc oxide resistance card is damaged under different impact currents.

The method comprises the steps of controlling an impulse current which is introduced into a zinc oxide resistance chip by an impulse current generator to be changed from a set current of the resistance chip to a maximum lightning current, and when the impulse current is increased to a critical impulse current corresponding to the rupture of the zinc oxide resistance chip, the zinc oxide resistance chip is destroyed to generate resistance chip fragments, so that the maximum pressure intensity of compressed air in zinc oxide equipment under different impulse currents is obtained.

Optionally, the maximum pressure intensity of the compressed air in the zinc oxide-containing equipment under different impact currents is obtained, the maximum temperature rise generated when the zinc oxide resistance card is damaged under different impact currents can be obtained firstly, and then the maximum pressure intensity of the compressed air in the zinc oxide-containing equipment when the zinc oxide resistance card is damaged is obtained according to the maximum temperature rise.

Specifically, the maximum temperature rise generated when the zinc oxide resistance card is damaged under different impact currents is obtained, the maximum temperature rise generated when the zinc oxide resistance card is damaged under different impact currents can be obtained by using a temperature monitoring component, the temperature monitoring component can be a high-speed infrared imager, and the maximum temperature rise of the zinc oxide resistance card in the damage process under different impact currents can be obtained through the high-speed infrared imager.

Acquiring the maximum temperature rise generated when the zinc oxide resistance card is damaged under different impact currents, and then acquiring the maximum pressure of compressed air inside the zinc oxide-containing equipment when the zinc oxide resistance card is damaged according to the maximum temperature rise, wherein the maximum pressure of the compressed air inside the zinc oxide-containing equipment meets the following formula:

wherein, P₂The maximum pressure of the compressed air in the zinc oxide-containing equipment, n is the amount of the substance of the compressed air in the zinc oxide-containing equipment, wherein n can be taken as a constant, R is a constant, T is the temperature rise generated when the zinc oxide resistor disc is damaged, T is the Kelvin temperature, and V is the volume of the compressed air in the zinc oxide-containing equipment. Specifically, the maximum temperature rise T of the zinc oxide resistor disc in the damage process under different impact currents can be obtained through a high-speed infrared imager, the maximum pressure P of the compressed air in the zinc oxide-containing equipment when the zinc oxide resistor disc is damaged can be obtained by combining the volume V of the compressed air in the zinc oxide-containing equipment and referring to the ideal gas state equation₂。

And S104, acquiring the maximum impact strength generated when the zinc oxide resistance card is damaged under different impact currents according to the impact strength and the maximum pressure.

Specifically, when the impact strength of the fragments of the zinc oxide resistor disc generated when the zinc oxide resistor disc is damaged and the maximum pressure of compressed air in the zinc oxide device when the zinc oxide resistor disc is damaged are obtained under different impact currents, the sum of the maximum value and the maximum pressure of the impact strength corresponding to the same impact current can be used as the maximum impact strength generated when the zinc oxide resistor disc corresponding to the impact current is damaged, that is, the maximum impact strength generated when the zinc oxide resistor disc is damaged satisfies the following formula:

P＝P_1max+P₂

wherein, P is the maximum impact strength generated when the zinc oxide resistance card is damaged, and P is_1maxIs the maximum value of the impact strength, P₂Therefore, the maximum impact strength generated when the zinc oxide resistance card is damaged under different impact currents is obtained,the design of the notch strength of the explosion-proof groove of the explosion-proof structure is provided with test data support.

The testing process of the embodiment of the invention truly simulates the impact force generated by the explosion of the zinc oxide-containing equipment, obtains the true explosion impact force generated when the zinc oxide resistance chip in the zinc oxide-containing equipment is damaged, can design the explosion-proof structure of the zinc oxide-containing equipment according to the test quantification result, truly and effectively guides the design of the explosion-proof structure, improves the efficiency and the economical efficiency of the explosion-proof test, has strong test repeatability, can efficiently and economically optimize the explosion-proof structure, and is beneficial to further improving the integral operation stability of the zinc oxide-containing equipment.

In addition, a tripping structure can be arranged, after the zinc oxide lightning protection equipment is damaged, the discharging gap in the tripper can discharge, and the gap discharge can cause the explosion of trace gunpowder in the tripper, so that the shell of the tripper is exploded, the tripper, the signal acquisition sensor and the grounding wire fall down, the zinc oxide lightning protection equipment losing the insulating property is supported and insulated by the insulating bracket, and the system can still normally operate, thereby preventing the explosion of the equipment containing the zinc oxide and avoiding the occurrence of accidents. However, the tripping structure can only be applied to a distribution network, a certain error action probability exists, and the window size does not meet the design requirement of the tripping structure in a circuit with a higher voltage level. The explosion-proof test method for the equipment containing the zinc oxide, provided by the embodiment of the invention, can effectively realize the test of the explosion-proof structure of the equipment containing the zinc oxide with higher voltage level, and is beneficial to the design of the explosion-proof structure of the equipment containing the zinc oxide with higher voltage level.

The embodiment of the invention also provides an explosion-proof testing device containing zinc oxide equipment, and fig. 2 is a schematic structural diagram of the explosion-proof testing device containing the zinc oxide equipment provided by the embodiment of the invention. As shown in fig. 2, the explosion-proof testing device of the zinc oxide-containing equipment comprises an explosion-proof cover 1, a surge current generator 3, a shooting component 4, a temperature monitoring component 5 and a controller (not shown in fig. 2), wherein two output ends of the surge current generator 3 are respectively and electrically connected with two ends of a zinc oxide resistance sheet 2, and the controller is respectively and electrically connected with the surge current generator 3, the temperature monitoring component 5 and the shooting component 4.

Explosion-proof cover 1 is used for placing the zinc oxide resistance card 2 that constitutes to contain zinc oxide equipment, explosion-proof cover 1 can be transparent glass explosion-proof cover for example, be used for placing the sample in order to test, it has explosion-proof performance, transparent glass explosion-proof cover is favorable to the 2 observation of destruction processes of the zinc oxide resistance card of explosion-proof cover 1 inside, impulse current generator 3 is used for letting in impulse current to zinc oxide resistance card 2, can set up impulse current generator 3's positive terminal and the one end electricity of zinc oxide resistance card 2 and be connected, impulse current generator 3's negative terminal and the other end electricity of zinc oxide resistance card 2 are connected, and be connected with the earthing terminal GND electricity. The shooting component 4 is used for monitoring the damage process of the zinc oxide resistance card 2 in the explosion-proof cover 1, and the shooting component 4 can be a high-definition camera, for example, namely, the high-definition camera can be used for shooting the damage process of the zinc oxide resistance card 2 in the explosion-proof cover 1. The temperature monitoring component 5 is used for monitoring the temperature rise in the explosion-proof cover 1, and the temperature monitoring component 5 can be, for example, a high-speed infrared imager, that is, the maximum temperature rise of the zinc oxide resistor disc 2 in the damage process under different impact currents can be obtained through the high-speed infrared imager.

The controller is used for executing the explosion-proof test method of the zinc oxide-containing device in the embodiment, and the controller can control the impact current generator 3 to supply different impact currents to the zinc oxide resistance card 2, obtain the impact strength of resistance card fragments generated when the zinc oxide resistance card 2 is damaged under different impact currents through the shooting part 4, and obtain the maximum pressure of compressed air in the zinc oxide-containing device when the zinc oxide resistance card 2 is damaged under different impact currents through the temperature monitoring part 5. Acquiring the impact strength of the fragments of the zinc oxide resistance card 2 generated when the zinc oxide resistance card 2 is damaged under different impact currents and the maximum pressure of compressed air in zinc oxide equipment when the zinc oxide resistance card 2 is damaged, and acquiring the maximum impact strength of the zinc oxide resistance card 2 generated when the zinc oxide resistance card 2 is damaged under different impact currents according to the impact strength and the maximum pressure.

Optionally, as shown in fig. 2, the explosion-proof testing apparatus containing a zinc oxide device may further include a current sensing component 7 and a wave recording component 8, where the current sensing component 7 is disposed corresponding to the discharge end of the zinc oxide resistive sheet 2, that is, corresponding to the lower end of the zinc oxide resistive sheet 2, the current sensing component 7 is configured to obtain the discharge current of the zinc oxide resistive sheet 2, the current sensing component 7 may be, for example, an induction coil shown in fig. 2, the current sensing component 7 utilizes hall effect to sense the discharge current waveform of the zinc oxide resistive sheet 2, the wave recording component 8 is electrically connected to the current sensing component 7 and the shooting component 4, the current sensing component 7 transmits the detected discharge current waveform of the zinc oxide resistive sheet 2 to the wave recording component 8, the wave recording component 8 may be, for example, a wave recorder, the wave recording component 8 is configured to record the current waveform of the discharge process of the zinc oxide resistive sheet 2, and triggers the shooting component 4 to work according to the discharge current, namely the wave recording component 8 is linked with the high-speed camera through the discharge current waveform of the zinc oxide resistance card 2 to trigger the high-speed camera to shoot and record.

For example, when the wave recorder judges that the discharge current of the zinc oxide resistance card 2 reaches the critical current value corresponding to the rupture of the zinc oxide resistance card 2, or is about to reach the critical current value corresponding to the rupture of the zinc oxide resistance card 2, the shooting component 4 may be triggered, for example, a high-speed camera shoots and records the rupture condition of the zinc oxide resistance card 2, so as to prevent the shooting component 4 from being in an operating state all the time, and reduce the power consumption of the testing device.

Optionally, as shown in fig. 2, the explosion-proof testing apparatus containing a zinc oxide device may further include an upper electrode plate 9 and a lower electrode plate 10 located in the explosion-proof cover 1, the upper electrode plate 9 and the lower electrode plate 10 are respectively located at two sides of the zinc oxide resistance sheet 2, the upper electrode plate 9 and the lower electrode plate 10 are used for fixing the zinc oxide resistance sheet 2, and the impact current generator 3 supplies impact current to the zinc oxide resistance sheet 2 through the upper electrode plate 9 and the lower electrode plate 10. Specifically, the upper electrode plate 9 is an upper contact electrode of the sample, the lower electrode plate 10 is a lower contact electrode of the sample, and the upper electrode plate 9 and the lower electrode plate 10 are used for conducting electricity and fixing the zinc oxide resistor chip 2 sample.

According to the embodiment of the invention, the shooting component 4, such as a high-speed camera, obtains the damage initial stage speed of the fragments of the resistor and the impact direction of the fragments of the resistor, so that the impact force of each surface of the fragments of the resistor is obtained, and the temperature monitoring component 5, such as a high-speed infrared imager, obtains the maximum temperature rise of air in the damage process of the fragments of the resistor, so that the maximum gas pressure in a limited space is obtained. The anti-explosion structure has the advantages that the anti-explosion structure is designed according to the test quantification result, the design of the anti-explosion structure is really and effectively guided, the efficiency and the economy of the anti-explosion test are improved, the test repeatability is high, the anti-explosion structure can be efficiently and economically optimized, and the stability of the overall operation of the equipment containing zinc oxide is further improved.

The embodiment of the invention also provides an explosion-proof design method of the zinc oxide-containing equipment. Fig. 3 is a schematic flow chart of an explosion-proof design method for a zinc oxide-containing device according to an embodiment of the present invention. The explosion-proof design method of the equipment containing the zinc oxide can be applied to the scene that the explosion-proof structure of the equipment containing the zinc oxide needs to be designed, and can be executed by the explosion-proof design device of the equipment containing the zinc oxide provided by the embodiment of the invention. As shown in fig. 3, the explosion-proof design method of the equipment containing zinc oxide comprises the following steps:

s201, acquiring rupture critical current of a zinc oxide resistance card forming the zinc oxide-containing equipment and the maximum lightning current of the zinc oxide-containing equipment.

Specifically, the rupture critical current of the zinc oxide resistance card forming the zinc oxide-containing equipment is the critical impact current value when the zinc oxide resistance card starts to rupture, and the maximum lightning current to which the zinc oxide-containing equipment is subjected is the maximum lightning current which can appear under lightning stroke and can be obtained by a lightning positioning system arranged near the zinc oxide-containing equipment line.

S202, according to a test method of an explosion-proof structure of equipment containing zinc oxide, obtaining the maximum impact strength corresponding to the rupture critical current and the maximum impact strength corresponding to the maximum lightning current.

Specifically, referring to the explosion-proof test method for the zinc oxide-containing device in the above embodiment, the maximum impact strength generated when the zinc oxide resistance card corresponding to the rupture critical current is destroyed can be obtained by obtaining the impact strength of the resistance card fragments generated when the zinc oxide resistance card corresponding to the rupture critical current is destroyed and the maximum pressure of the compressed air inside the zinc oxide-containing device when the zinc oxide resistance card corresponding to the rupture critical current is destroyed. Similarly, the maximum impact strength generated when the zinc oxide resistance card corresponding to the maximum lightning current is damaged can be obtained by obtaining the impact strength of the resistance card fragments generated when the zinc oxide resistance card corresponding to the maximum lightning current is damaged and the maximum pressure of compressed air in the zinc oxide equipment when the zinc oxide resistance card corresponding to the maximum lightning current is damaged.

S203, acquiring the notch strength of the explosion-proof groove in the explosion-proof structure according to the maximum impact strength corresponding to the rupture critical current and the maximum impact strength corresponding to the maximum lightning current.

Specifically, after the maximum impact strength corresponding to the rupture critical current and the maximum impact strength corresponding to the maximum lightning strike current are obtained, the notch impact strength of the explosion-proof groove can be designed to meet the following conditions:

P_I1≤P_C≤P_I2

wherein, P_CNotch impact strength, P, for explosion-proof grooves_I1To break the critical current I₁Maximum impact strength, P, to failure of equipment containing zinc oxide_I2Is the maximum lightning current I₂Maximum impact strength to failure of the zinc oxide containing equipment. Specifically, the explosion-proof structure that contains zinc oxide equipment can include the cylindric core that the zinc oxide resistance card constitutes, the cover is provided with the first explosion-proof structure of a plurality of pressure release mouths and the cover is provided with the second explosion-proof structure of a plurality of explosion-proof grooves in the first explosion-proof structure outside the core outside, and core, first explosion-proof structure and second explosion-proof structure form nested cylindric structure from inside to outside, and pressure release mouth and explosion-proof groove one-to-one set up.

Illustratively, the first explosion-proof structure and the second explosion-proof structure can be made of epoxy resin, a pressure release port arranged on the first explosion-proof structure forms a first outlet for pressure release, and when a core body of the zinc oxide-containing device is overheated, hot air flows firstly diffuse out from the pressure release port. Through set up explosion-proof groove on the explosion-proof structure of second, the thickness in explosion-proof groove is less than the wall thickness of second explosion-proof structure, and explosion-proof groove forms the weak position of stress, comes out the back from pressure release mouth when the hot gas flow, dashes out from explosion-proof groove to prevent that the expanded hot gas flow from causing bigger damage to the core, reduce the risk that the circuit took place to fall the cluster.

According to the embodiment of the invention, the impact strength of the notch of the explosion-proof groove is set to be greater than or equal to the maximum impact strength of the zinc oxide-containing equipment damaged under the critical current of rupture, so that the sealing performance of the explosion-proof structure of the zinc oxide-containing equipment is ensured, and the problems that the mechanical stress of the epoxy structure is reduced, the inner notch is easily damaged under windage yaw or electric power, and the resistance card is affected with damp and fails due to the fact that external moisture invades into the inner resistance card due to the over-small thickness of the notch design are avoided. The embodiment of the invention sets the impact strength of the notch of the explosion-proof tank to be less than or equal to the maximum impact strength of the damage of the equipment containing zinc oxide under the maximum lightning current, so as to avoid the problems that the stress generated by the damage of the resistance card due to the overlarge thickness of the notch design can not be released at the first time, and a large amount of gas is generated inside the equipment containing zinc oxide under the continuous combustion of electric arcs, which can cause the violent damage of the whole structure of the equipment containing zinc oxide, and the combustion of internal materials can occur at continuous high temperature, thus affecting the safety of the equipment containing zinc oxide and personnel.

When the impact resistance strength of the explosion-proof groove of the explosion-proof structure is designed, the impact resistance strength P of the explosion-proof groove_cThe closer to P_I1The more advantageous the operation of the explosion-proof tank, so that it can be operated from P_I1Designing the notch strength of the explosion-proof groove, and determining the thickness of the notch of the explosion-proof groove according to the specific material of the explosion-proof structure.

Optionally, the maximum length of the maximum resistor piece fragments generated when the zinc oxide resistor piece is damaged can be obtained, for example, the maximum length L of the maximum resistor piece fragments generated when the zinc oxide resistor piece is damaged can be obtained through a high definition camera, then the size of the notch of the explosion-proof groove in the explosion-proof structure can be obtained according to the maximum length, for example, the width of the notch of the explosion-proof groove in the explosion-proof structure can be designed according to L, and the length of the notch of the explosion-proof groove in the explosion-proof structure is designed according to 2L.

Optionally, after the notch strength of the explosion-proof groove in the explosion-proof structure is obtained according to the maximum impact strength corresponding to the rupture critical current and the maximum impact strength corresponding to the maximum lightning strike current, the sealing performance of the zinc oxide-containing equipment after the mechanical load is set can be tested, and the design value of the notch strength of the explosion-proof groove in the explosion-proof structure is adjusted according to the test result of the sealing performance. Specifically, a sealing performance test can be performed on a zinc oxide-containing device with a designed explosion-proof structure, a rated mechanical load is applied to the explosion-proof structure, and then the sealing performance test of the zinc oxide-containing device is performed. If the sealing performance is not passed, the notch strength of the explosion-proof groove is increased by 10 percent for example, and then the sealing performance of the equipment containing the zinc oxide is repeatedly tested until the sealing performance meets the requirement, and the notch strength when the sealing performance passes is determined as the final notch strength.

Fig. 4 is a schematic specific flow chart of an explosion-proof design method for a zinc oxide-containing device according to an embodiment of the present invention. The explosion-proof design method of the equipment containing the zinc oxide can be applied to scenes needing to design the explosion-proof structure of the equipment containing the zinc oxide, and can be executed by the explosion-proof design device of the equipment containing the zinc oxide provided by the embodiment of the invention. As shown in fig. 4, the explosion-proof design method of the equipment containing zinc oxide includes:

s301, obtaining the maximum lightning current amplitude.

S302, the zinc oxide resistance card is placed in a zinc oxide resistance card cracking performance testing device.

And S303, carrying out destruction tests of different currents, and shooting the destruction process of the resistance card by a high-speed camera.

And S304, obtaining the maximum impact strength of the resistor disc when the resistor disc is damaged under different current amplitudes.

S305, obtaining the maximum temperature rise of the zinc oxide resistance card in the damage process under different currents through a high-speed infrared imager.

S306, obtaining the maximum pressure of the compressed air in the zinc oxide equipment in the damage process of the zinc oxide resistance card.

And S307, obtaining the maximum impact strength of the equipment containing zinc oxide under different current amplitudes under damage.

And S308, carrying out explosion-proof design on the structure of the equipment containing zinc oxide.

And S309, judging whether the sealing performance meets the requirement or not according to the sealing performance after mechanical loading. If yes, go to step 311; if not, go to step 310.

And S310, increasing the notch strength of the explosion-proof groove by 10%.

S311, obtaining the explosion-proof tank structure of the zinc oxide-containing equipment.

The embodiment of the invention also provides an explosion-proof design device of the zinc oxide-containing equipment. Fig. 5 is a schematic structural diagram of an explosion-proof design device of a zinc oxide-containing apparatus according to an embodiment of the present invention. As shown in fig. 5, the explosion-proof design apparatus for zinc oxide-containing equipment comprises a current acquisition module 401, an impact strength acquisition module 402 and a notch strength acquisition module 403, wherein the current acquisition module 401 is used for acquiring the rupture critical current of a zinc oxide resistance card constituting the zinc oxide-containing equipment and the maximum lightning strike current of the zinc oxide-containing equipment. The impact strength obtaining module 402 is configured to obtain a maximum impact strength corresponding to the rupture critical current and a maximum impact strength corresponding to the maximum lightning strike current according to the testing method described in the foregoing embodiment. The notch strength obtaining module 403 is configured to obtain notch strength of an explosion-proof slot in an explosion-proof structure according to the maximum impact strength corresponding to the rupture critical current and the maximum impact strength corresponding to the maximum lightning strike current.

According to the embodiment of the invention, a test platform for zinc oxide resistance chip damage is firstly set up, the impact energy which can appear in the early stage of zinc oxide resistance chip damage and the local temperature rise caused by electric arc are obtained through tests, and the impact force under the condition of zinc oxide resistance chip damage is obtained according to the calculation of the impact energy and the air expansion pressure. And obtaining the impact resistance of the explosion-proof groove according to the quantified impact force, and verifying the sealing performance to ensure that the sealing performance meets the normal operation requirement. Through the design, the real bursting impact force is obtained, the anti-explosion structure design of the zinc oxide-containing equipment can be carried out according to the test quantification result, the design of the anti-explosion structure is really and effectively guided, the efficiency and the economical efficiency of the anti-explosion test are improved, the test repeatability is strong, the anti-explosion structure can be efficiently and economically optimized, and the stability of the overall operation of the zinc oxide-containing equipment is further improved.

Those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than others, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments.

Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.