阅读说明：本技术 一种防顶网过电压保护装置 (Prevent top net overvoltage protection device ) 是由 杜少兵 赵捷 刘恩南 任跃峰 余明宣 贾彦伟 王莹 林久胜 崔湖勇 方旭豪 陈余 于 2021-08-13 设计创作，主要内容包括：本发明公开了一种防顶网过电压保护装置,包括绝缘壳体,所述绝缘壳体内设有过电压保护件,所述绝缘壳体两端设有第一导电连接件和第二导电连接件,所述过电压保护件两端分别与第一导电连接件和第二导电连接件形成电连接；所述绝缘壳体内还设有短路保护件,所述短路保护件一端与第一导电连接件电连接且另一端与高压母线电连接；所述短路保护件额定电流大于过电压保护件正常泄漏电流,且小于过电压保护件故障电流。本发明具有以下优点和效果：本发明可满足机车过电压保护同时,弥补现有机车过电压保护件在故障条件下形成短路接地导致烧网的缺陷,从而提高机车运行的安全可靠性。(The invention discloses an overvoltage protection device for a top net, which comprises an insulating shell, wherein an overvoltage protection part is arranged in the insulating shell, a first conductive connecting part and a second conductive connecting part are arranged at two ends of the insulating shell, and two ends of the overvoltage protection part are respectively and electrically connected with the first conductive connecting part and the second conductive connecting part; a short-circuit protection piece is further arranged in the insulating shell, one end of the short-circuit protection piece is electrically connected with the first conductive connecting piece, and the other end of the short-circuit protection piece is electrically connected with the high-voltage bus; the rated current of the short circuit protection element is larger than the normal leakage current of the overvoltage protection element and smaller than the fault current of the overvoltage protection element. The invention has the following advantages and effects: the invention can satisfy the locomotive overvoltage protection and simultaneously make up the defect of network burning caused by the short circuit grounding formed by the existing locomotive overvoltage protection part under the fault condition, thereby improving the safety and reliability of the locomotive operation.)

1. An overvoltage protection device for a top protection net comprises an insulating shell, wherein an overvoltage protection piece (6) is arranged in the insulating shell, a first conductive connecting piece (3) and a second conductive connecting piece (7) are arranged at two ends of the insulating shell, and two ends of the overvoltage protection piece (6) are respectively and electrically connected with the first conductive connecting piece (3) and the second conductive connecting piece (7); the method is characterized in that: a short-circuit protection piece (5) is further arranged in the insulating shell, one end of the short-circuit protection piece (5) is electrically connected with the first conductive connecting piece (3), and the other end of the short-circuit protection piece is electrically connected with the high-voltage bus; the rated current of the short-circuit protection element (5) is larger than the normal leakage current of the overvoltage protection element (6) and smaller than the fault current of the overvoltage protection element (6).

2. An anti-net-jacking overvoltage protection device according to claim 1, wherein said insulating housing comprises a first insulating housing (1) and a second insulating housing (2), said overvoltage protection member (5) being arranged in the first insulating housing (1) and the short circuit protection member (5) being arranged in the second insulating housing (2).

3. The overvoltage protection device of claim 2, wherein said short circuit protection means (5) is provided with a third conductive connector (4) at one end and a fourth conductive connector (51) at the other end, said fourth conductive connector (51) being provided with a through hole (511) for connecting a high voltage bus.

4. An anti-net-roof overvoltage protection device according to claim 3, characterized in that the third conductive connection member (4) is in threaded connection with the first conductive connection member (3).

5. An anti-head net overvoltage protection device according to claim 2, characterized in that the first insulating housing (1) comprises a first insulating cylinder (11) and a first insulating shed (12) coated outside thereof, and the second insulating housing (2) comprises a second insulating cylinder (21) and a second insulating shed (22) coated outside thereof.

6. The overvoltage protection device of claim 1, wherein a spring positioning seat cylinder (9) and a core positioning block (10) are respectively arranged at two ends of the overvoltage protection element (6), a conductive elastic element (8) is further arranged between the spring positioning seat cylinder (9) and the first conductive connecting element (3), the core positioning block (10) is arranged between the overvoltage protection element (6) and the second conductive connecting element (7), and the spring positioning seat cylinder (9), the overvoltage protection element (6) and the core positioning block (10) are abutted in sequence under the elastic force of the conductive elastic element (8).

7. The overvoltage protection device of claim 5, wherein a base (13) is disposed at a lower end of the first insulating housing (1), and at least two fixing holes (131) are disposed on the base (13) and are connected to the locomotive roof through the fixing holes (131) by bolts.

8. The overvoltage protection device of any one of claims 1 to 7, wherein said overvoltage protection means (6) is a zinc oxide resistor stack.

9. The overvoltage protection device of any one of claims 1 to 7, wherein the short circuit protection element (5) is arranged coaxially with the second insulating cylinder (21), and the space between the short circuit protection element (5) and the second insulating cylinder (21) is filled with quartz sand.

10. An anti-net-roof overvoltage protection device according to any one of claims 1 to 7, characterized in that the short-circuit protection element (5) blows when the short-circuit protection element (5) passes a current exceeding the rated current for 10s to 60 s.

Technical Field

The invention relates to the field of locomotive electrical equipment, in particular to an overvoltage protection device for a top net.

Background

When the overvoltage protection part is adopted for preventing overvoltage of the existing locomotive, but the performance of the overvoltage protection part is inevitably reduced along with the time, once a critical point is broken through, the overvoltage protection part can be broken down, after the overvoltage protection part is broken down, the resistance is almost zero, which is equal to that of a contact net which is directly grounded, the contact net can be blown down due to large short-circuit current, C-type accidents are caused, and great loss is caused to the operation of the whole vehicle.

Disclosure of Invention

The invention aims to overcome the defects and shortcomings of the prior art, and provides equipment which can prevent an overvoltage protection part from being isolated from a contact network system in a failure state, does not influence the normal power supply of the contact network system, and avoids secondary damage to a vehicle network, so as to solve the problems in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: an overvoltage protection device for a top net comprises an insulating shell, wherein an overvoltage protection part is arranged in the insulating shell, a first conductive connecting part and a second conductive connecting part are arranged at two ends of the insulating shell, and two ends of the overvoltage protection part are respectively and electrically connected with the first conductive connecting part and the second conductive connecting part; the method is characterized in that: a short-circuit protection piece is further arranged in the insulating shell, one end of the short-circuit protection piece is electrically connected with the first conductive connecting piece, and the other end of the short-circuit protection piece is electrically connected with the high-voltage bus; the rated current of the short circuit protection element is larger than the normal leakage current of the overvoltage protection element and smaller than the fault current of the overvoltage protection element.

As a further scheme of the invention: the insulation housing comprises a first insulation housing and a second insulation housing, the overvoltage protection element is arranged in the first insulation housing, and the short circuit protection element is arranged in the second insulation housing.

As a further scheme of the invention: and one end of the short circuit protection piece is provided with a third conductive connecting piece, the other end of the short circuit protection piece is provided with a fourth conductive connecting piece, and the fourth conductive connecting piece is provided with a through hole for connecting a high-voltage bus.

As a further scheme of the invention: the third conductive connecting piece is connected with the first conductive connecting piece through threads.

As a further scheme of the invention: the first insulating shell comprises a first insulating cylinder and a first insulating umbrella skirt coated outside the first insulating cylinder, and the second insulating shell comprises a second insulating cylinder and a second insulating umbrella skirt coated outside the second insulating cylinder.

As a further scheme of the invention: a spring positioning seat cylinder and a core body positioning block are respectively arranged at two ends of the overvoltage protection element, a conductive elastic element is further arranged between the spring positioning seat cylinder and the first conductive connecting element, and the core body positioning block is arranged between the overvoltage protection element and the second conductive connecting element.

As a further scheme of the invention: the lower end of the first insulating shell is provided with a base, the base is provided with a fixing hole position, and the fixing hole position is connected with a locomotive top cover through a bolt.

As a further scheme of the invention: the overvoltage protection part is a zinc oxide resistor sheet group.

As a further scheme of the invention: the short-circuit protection piece and the second insulating cylinder are coaxially arranged, and quartz sand is filled between the short-circuit protection piece and the second insulating cylinder.

As a further scheme of the invention: and when the short-circuit protection element passes the current exceeding the rated current, the fusing time is 10s-60 s.

The invention has the following beneficial effects: according to the invention, under the condition that the overvoltage protection part is in a failure state, the overvoltage protection part can be isolated from the contact network system by using the short circuit protection part, the normal power supply of the contact network system is not influenced, and the secondary damage to the locomotive network is avoided, so that the safety and reliability of the locomotive operation are improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.

FIG. 1 is a front view of the present invention;

FIG. 2 is a top view of the present invention;

FIG. 3 is a cross-sectional view taken at A of FIG. 2;

in the figure: 1-a first insulating housing; 11-a first insulating cylinder; 12-a first insulating shed; 13-a base; 131-a fixation hole site; 2-a second insulating housing; 21-a second insulating cylinder; 22-a second insulating shed; 3-a first conductive connection; 4-a third conductive connection; 5-short circuit protection; 51-a fourth conductive connection; 511-a via; 6-overvoltage protection; 7-a second conductive connection; 8-a conductive elastic member; 9-spring positioning seat cylinder; 10-core positioning block.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.

It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, which are not described in any more detail in the following embodiments.

The terms of direction and position of the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., refer to the direction or position of the attached drawings

And (4) placing. Accordingly, the use of directional and positional terms is intended to illustrate and understand the present invention and is not intended to limit the scope of the present invention.

As shown in fig. 1 to 3, an overvoltage protection device for a roof net comprises an insulating housing, an overvoltage protection member 6 is disposed in the insulating housing, a first conductive connecting member 3 and a second conductive connecting member 7 are disposed at two ends of the insulating housing, and two ends of the overvoltage protection member 6 are electrically connected with the first conductive connecting member 3 and the second conductive connecting member 7 respectively; a short-circuit protection piece 5 is further arranged in the insulating shell, one end of the short-circuit protection piece 5 is electrically connected with the first conductive connecting piece 3, and the other end of the short-circuit protection piece 5 is electrically connected with the high-voltage bus; the rated current of the short-circuit protection element 5 is larger than the normal leakage current of the overvoltage protection element 6 and smaller than the fault current of the overvoltage protection element 6; the rated current is the current of the short-circuit protection piece 5 when the short-circuit protection piece operates under the rated voltage and according to the rated power, and when the current exceeds the rated current, the short-circuit protection piece 5 can have the fusing problem; the normal leakage current is the current passing through the overvoltage protection element 6 when the overvoltage protection element 6 works under a normal rated voltage, when the performance of the overvoltage protection element 6 is reduced, the leakage current of the overvoltage protection element 6 is increased, and when the leakage current of the overvoltage protection element 6 is too large, a fault current is reached, and the overvoltage protection element 6 is damaged or short-circuited; in the invention, under the failure state of the overvoltage protection part 6, the short-circuit protection part 5 can isolate the overvoltage protection part from a contact network system, the normal power supply of the contact network system is not influenced, and meanwhile, equipment causing secondary damage to a vehicle network is avoided, so that the safety and reliability of the operation of a locomotive are improved.

The insulation housing comprises a first insulation housing 1 and a second insulation housing 2, an overvoltage protection element 6 is arranged in the first insulation housing 1, and a short-circuit protection element 5 is arranged in the second insulation housing 2; the first insulating shell 1 comprises a first insulating cylinder 11 and a first insulating shed 12 coated outside the first insulating cylinder, and the second insulating shell 2 comprises a second insulating cylinder 21 and a second insulating shed 22 coated outside the second insulating cylinder; the insulating cylinder mainly plays a supporting and connecting role, and the insulating umbrella skirt mainly plays a sealing and insulating role.

The short circuit protection piece 5 one end is equipped with third conductive connecting piece 4, and the other end is equipped with fourth conductive connecting piece 51, be equipped with through-hole 511 on the fourth conductive connecting piece 51 and be used for connecting the high voltage bus, third conductive connecting piece 4 passes through threaded connection with first conductive connecting piece 3, simple to operate improves the efficiency of construction.

The overvoltage protection component is characterized in that two ends of the overvoltage protection component 6 are respectively provided with a spring positioning seat barrel 9 and a core positioning block 10, a conductive elastic component 8 is further arranged between the spring positioning seat barrel 9 and the first conductive connecting component 3, the core positioning block 10 is arranged between the overvoltage protection component 6 and the second conductive connecting component 7, and the spring positioning seat barrel 9, the overvoltage protection component 6 and the core positioning block 10 are sequentially abutted and tightly laminated together along the axial direction under the elastic action of the conductive elastic component 8.

The lower end of the first insulating shell 1 is provided with a base 13, the base 13 is provided with a fixing hole 131, and the fixing hole is connected with a locomotive top cover through bolts, so that the fixing hole is firm and reliable, and the safety of equipment in use is improved.

The short-circuit protection piece 5 and the second insulating cylinder 21 are coaxially arranged, and quartz sand is filled between the short-circuit protection piece 5 and the second insulating cylinder 21 and mainly plays roles in arc extinction and heat dissipation.

The overvoltage protection element 6 may be made of metal oxide, and in this embodiment, the overvoltage protection element 6 is made of a zinc oxide resistor group.

The short-circuit protection member 5 may be made of copper, silver, zinc, lead-tin alloy, etc., in this embodiment, the short-circuit protection member 5 is made of low melting point solder and copper wire.

When the short-circuit protection piece 5 passes through the current exceeding the rated current for 10s-60s continuously, the short-circuit protection piece 5 is fused; for example, the rated current of the short-circuit protection element 5 is 10A, the normal leakage current of the overvoltage protection element 6 is 1mA, the fault current of the overvoltage protection element 6 is 30A, the endurance time of the short-circuit protection element is 5min, the short-circuit protection element 5 is fused with a copper wire through low-melting-point soldering tin, the fusing time of the short-circuit protection element can be effectively guaranteed to be 10s-60s at 30A, and the function of protecting a contact net system can be timely played.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.