SF (sulfur hexafluoride)6Temperature rise detection device of electrical equipment
阅读说明：本技术 一种sf6电气设备的温升检测装置 (SF (sulfur hexafluoride)6Temperature rise detection device of electrical equipment ) 是由 李建鹏 赵冀宁 付炜平 胡伟涛 刘晓飞 杨世博 孟延辉 赵智龙 尹子会 冯鹏森 于 2021-07-21 设计创作，主要内容包括：本发明公开了一种SF-6电气设备的温升检测装置,SF-6电气设备包括A相、B相和C相连接端口,本发明装置包括温升检测装置包括设置在分别安装在待测SF-6电气设备的A相、B相和C相连接端口上的两块SF-6压力表。两块SF-6压力表中一块为带温度补偿的压力表A,另一块为不带温度补偿的压力表B。本发明能够及时发现设备发热缺陷。(The invention discloses an SF 6 Temperature rise detection device of electrical equipment, SF 6 The electric equipment comprises A phase, B phase and C phase connection ports, the temperature rise detection device comprises a temperature rise detection device which is respectively arranged on SF to be detected 6 Two SF on the phase A, phase B and phase C connection ports of an electrical device 6 And a pressure gauge. Two blocks of SF 6 One of the pressure gauges is a pressure gauge A with temperature compensation, and the other is a pressure gauge B without temperature compensation. The invention can find the heating defect of the equipment in time.)
1. SF (sulfur hexafluoride)6Temperature rise detection device of electrical equipment, SF6The electrical equipment comprises a phase A, a phase B and a phase C connection port, and is characterized in that: the temperature rise detection device is respectively arranged on SF to be detected6Two SF blocks on the phase A, phase B and phase C connection ports of the electrical equipment (6)6And a pressure gauge.
2. SF according to claim 16Temperature rise detection device of electrical equipment, its characterized in that: two blocks of SF6One of the pressure gauges is a pressure gauge A (1) with temperature compensation, and the other is a pressure gauge B (2) without temperature compensation.
3. SF according to claim 16Temperature rise detection device of electrical equipment, its characterized in that: at each SF6The pressure gauge is internally and electrically connected with a control module (7).
4. An SF according to claim 36Temperature rise detection device of electrical equipment, its characterized in that: the control module and its corresponding SF6The pressure gauges are electrically connected through electric wires, and all the control modules are in wireless communication connection with the single chip microcomputer controller; the number of the single chip microcomputer controllers is one.
5. An SF according to claim 36Temperature rise detection device of electrical equipment, its characterized in that: the control modules are in wireless communication connection; the singlechip controller is electrically connected with a display and an alarm.
6. SF according to claim 16Temperature rise detection device of electrical equipment, its characterized in that: two SF blocks arranged in the same phase6The pressure gauge is connected with the first communicating pipe (3)The first communication pipe (3) and the SF to be measured6An L-shaped second communication pipe (4) is arranged between the electrical equipment (6).
7. SF according to claim 66Temperature rise detection device of electrical equipment, its characterized in that: SF is arranged in the second communicating pipe (4)6An intake pipe (5).
8. An SF according to claim 76Temperature rise detection device of electrical equipment, its characterized in that: SF6The air inlet pipe (5) is provided with a first opening and closing valve (5-1).
9. An SF according to claim 76Temperature rise detection device of electrical equipment, its characterized in that: a second on-off valve (4-1) is arranged on the second communicating pipe (4), and the second on-off valve (4-1) is positioned at SF6An air inlet pipe (5) and the first communicating pipe (3).
10. An SF according to claim 76Temperature rise detection device of electrical equipment, its characterized in that: the second communicating pipe (4) is provided with a third opening and closing valve (4-2).
Technical Field
The invention relates to the technical field of power equipment safe operation monitoring, in particular to SF6Temperature rise detection device of electrical equipment.
Background
With the rapid development of power systems and the increasing voltage class, SF6Electrical equipment is increasingly being used by virtue of its excellent insulating and arc extinguishing properties.
SF6The electric equipment generates heat when in operation and after insulation deterioration, and a large number of field tests and operation experiences show that temperature rise change and SF caused by heat effect6The health condition of the electrical equipment is closely related, is an important characterization of the equipment state, and has higher sensitivity to poor contact of the contact and initial insulation degradation defect. Non-contact infrared thermal imaging method or various types are generally adopted for detecting equipment state by using thermal effectThe contact temperature sensor methods of (1) indirectly measure the internal temperature by detecting the temperature distribution of the outer surface of the equipment, and can not accurately master the temperature field distribution inside the equipment and the equipment state information reflected by the temperature field distribution.
In view of this situation, it is necessary to develop a method capable of accurately grasping SF6The internal temperature of the electrical device.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide the SF capable of timely finding the heating defect of the equipment6Temperature rise detection device of electrical equipment.
The technical scheme adopted by the invention for solving the technical problems is as follows: SF6The electric equipment comprises A phase, B phase and C phase connection ports, and the temperature rise detection device comprises a temperature rise detection device and a temperature rise detection device, wherein the temperature rise detection device is respectively arranged on SF to be detected6Two SF on the phase A, phase B and phase C connection ports of an electrical device6And a pressure gauge.
Further, two SF blocks6One of the pressure gauges is a pressure gauge A with temperature compensation, and the other is a pressure gauge B without temperature compensation.
Further, at each SF6The pressure gauge is internally and electrically connected with a control module.
Further, the control module and its corresponding SF6The pressure gauges are electrically connected through electric wires, and all the control modules are in wireless communication connection with the single chip microcomputer controller; the number of the single chip microcomputer controllers is one.
Furthermore, the control modules are in wireless communication connection; the singlechip controller is electrically connected with a display and an alarm.
Further, two SF blocks installed in the same phase6The pressure gauge is connected through a first communication pipe, the first communication pipe is connected with SF to be measured6An L-shaped second communication pipe is arranged between the electrical equipment.
Further, the second communication pipe is provided with SF therein6An air inlet pipe.
Further, SF6The air inlet pipe is provided with a first openingAnd closing the valve.
Further, a second on-off valve is arranged on the second communicating pipe and is positioned at SF6Between the air inlet pipe and the first communicating pipe.
Further, the second communication pipe is provided with a third opening/closing valve.
The theoretical basis of the invention is as follows: from three state parameter relationships (p ═ ρ Rt, where R is a constant) of gas pressure-density-temperature (p- ρ -t), it can be seen that: when the ambient temperature is constant, the density changes in proportion to the change in pressure; when the ambient temperature changes and the density does not change, the pressure changes along with the change of the temperature. According to SF6Physical characteristics of the gas, SF at a certain temperature in a closed container6The gas density may actually be represented by a pressure value. To maintain SF in a closed container6The gas pressure is not changed, and only the changed temperature is compensated. Currently SF6SF for electrical equipment6The gas pressure gauge is a pressure measurement instrument with a temperature compensation function. SF to be detected as described in the present invention6Two SF are respectively arranged on three phases of the circuit breaker A, B, C6A pressure gauge, wherein the pressure gauge A with temperature compensation is a pressure measurement instrument with temperature compensation function shown in figure 3 and is used for monitoring SF6Whether there is a leak of gas. It measures SF by means of a measuring element6The pressure of the gas, and then the SF is fed through a temperature compensation element of the pressure gauge6Converting the gas pressure into a pressure measurement at 20 deg.C, using the pressure measurement (P)20Value) represents SF6Gas density value. When SF6When the density of the gas is constant, P20The value does not change with changes in temperature to produce a change in the measured value.
The application process of the present invention comprises the following steps,
s1 in the detection of SF6The A, B, C three phases of the electrical equipment are respectively provided with two SF6Pressure gauge, said two blocks SF6The pressure gauges are respectively a pressure gauge A with temperature compensation and a pressure gauge B without temperature compensation; the whole electrical equipment is provided with six SF blocks6And a pressure gauge. Three of which have temperature compensated pressureTable a and three pressure tables B without temperature compensation.
In step S1, SF6Confirming the SF to be detected after the pressure gauge is installed6Presence or absence of SF in electrical equipment6Gas leakage in ensuring SF6Temperature rise detection and prediction can be carried out by using a subsequent method on the premise of no gas leakage; confirming whether SF exists in equipment to be detected or not by utilizing pressure change of pressure gauge A6Gas leakage, if the indication of the pressure gauge A is unchanged, indicating that SF does not occur6Gas leakage, if the indication of the pressure gauge A changes, indicating the occurrence of SF6If gas leaks, the leakage point is checked and repaired, and if gas leaks, the temperature rise test method cannot be used, and only the leakage point is checked and the repair is finished, so that SF is ensured6When the gas is not leaked, the subsequent steps are carried out. The pressure gauge A is used for monitoring the SF inside the equipment in real time6Whether gas leaks or not, and a pressure gauge B is used for monitoring the SF inside the equipment in real time6The pressure of the gas.
S2 calculating A, B, C phases of SF by using pressure value p and temperature value t of pressure gauge A6Gas density value ρA、ρB、ρC。
In S2, A, B, C phases of SF are calculated respectively by using the pressure value p and the temperature value t (20 ℃) of the pressure gauge A6Gas density value ρA、ρB、ρC，SF6When gas is not leaked ρA、ρB、ρCIs a constant value.
Specifically, in step S2, the pressure value P of the pressure gauge a and the compensated temperature value t corresponding thereto are substituted into equation (1) to obtain SF6A gas density ρ;
p＝0.57×10-4ρt(1+B)-ρ2A (1)；
wherein, P is a pressure value, Mpa; t is a temperature value, K; rho is density, kg/m3。
The coefficient A is obtained according to a formula (2), and the coefficient B is obtained according to a formula (3);
A＝0.75×10-4(1-0.727×10-3ρ) (2)；
B＝2.51×10-3ρ(1-0.846×10-3ρ) (3)；
rho is density, kg/m3。
Specifically, the compensation temperature of the pressure gauge a is 20 ℃, and the compensated temperature value t of the pressure gauge a is 20+ 273.5-293.5K;
respectively measuring the pressure value P of a pressure gauge A in A, B, C phasesA、PBAnd PcSubstituting the compensated temperature value t into the formula (1) to obtain the SF corresponding to A, B, C6Gas density ρA、ρBAnd ρC；ρASF corresponding to A6Gas density, kg/m3，ρBIs SF corresponding to B6Gas density, kg/m3，ρCIs SF corresponding to C6Gas density, kg/m3。
S3 using the current pressure value displayed by the pressure gauge B of A, B, C phase and SF combined with the step S26The gas density value calculates the current temperature value t of three phases of the equipment A, B, CVertical and horizontal A、tVertical and horizontal B、tVertical and horizontal C。
In step S3, the current pressure value P of the pressure gauge B is usedVertical and horizontal A、PVertical and horizontal B、PVertical and horizontal CAnd SF calculated at S26Gas density value ρA、ρB、ρCRespectively calculating current temperature values t of A, B, C three-phase equipment of the equipmentVertical and horizontal A、tVertical and horizontal B、tVertical and horizontal C。
Displaying the current pressure value P of the pressure gauge BVertical and horizontalAnd SF obtained in step (3)6Substituting the gas density value rho into the formula (1) to calculate the current temperature tVertical and horizontalAnd at the current temperature tVertical and horizontalCharacterization of SF6The actual temperature inside the electrical device. In step S3, the current pressure value P displayed by the pressure gauge B of phase AVertical and horizontal AAnd SF obtained in step S26Gas density value ρASubstituting the formula (1) to calculate the current temperature of the A-phase equipmenttVertical and horizontal A(ii) a Displaying the current pressure value P of the pressure gauge B of the phase BVertical and horizontal BAnd SF obtained in step S26Gas density value ρBSubstituting the formula (1) to calculate the current temperature t of the B-phase equipmentVertical and horizontal B(ii) a Displaying the current pressure value P of the pressure gauge B of the C phaseVertical and horizontal CAnd SF obtained in step S26Gas density value ρCSubstituting the formula (1) to calculate the current temperature t of the C-phase equipmentVertical and horizontal C。
S4 determines A, B, C the state of the three phases.
In step S4, t is selected based on the device state determination method of interplanetary evidencesVertical and horizontal A、tVertical and horizontal B、tVertical and horizontal CThe lowest temperature of the two phases is the standard phase, and the other two phases are the phases to be compared.
T is selected because the probability of A, B, C three-phase simultaneous overheating fault is basically zero in the operation process of the equipmentVertical and horizontal A、tVertical and horizontal B、tVertical and horizontal CThe smallest of these is the standard phase and the other two are the phases to be compared.
And determining whether the phase to be compared is in a normal state, an attention state or an abnormal state by calculating the temperature difference value of the phase to be compared and the standard phase, and further differentiating and maintaining equipment in a targeted operation mode.
For SF in abnormal state6The real-time temperature of the electrical equipment is predicted so as to accurately and timely arrange power failure for defect elimination work and ensure that the loss of power supply load is reduced to the maximum extent.
Specifically, in consideration of the difference between the temperature rise caused by the high load when the device operates and the actual temperature rise caused by the difference between the device structure, the installation position, and the illumination, the determination criterion of step S4 is to calculate the temperature difference between the phase to be compared and the standard phase, and determine the health status of the phase to be compared according to the temperature difference between the phase to be compared and the standard phase;
when the temperature difference is between 0K and 5K, the phase to be compared is in a normal state, and the equipment is normal and can continuously run at the moment;
when the temperature difference is 5K-10K, the phase to be compared is in an attention state, the inspection cycle of the phase to be compared is shortened, and monitoring is enhanced;
when the temperature difference is more than 10K, the phases to be compared are in an abnormal state, and other means are adopted to enhance monitoring and combine a power failure plan to timely develop hidden danger treatment work.
The method also comprises a step S5, wherein in the step S5, when the phase to be compared is in an abnormal state, the alarm gives an alarm. The invention has the beneficial effects that:
the invention is in SF6Two SF are respectively arranged on three phases of the electrical equipment A, B, C6Pressure gauge for effective detection of SF6The temperature rise condition of the electrical equipment is mastered, the internal temperature and the equipment state information of the equipment are displayed on a display, and the real-time temperature of the equipment with the heating defect is alarmed in time.
Drawings
FIG. 1 SF to be tested6The structure schematic diagram of the connection of the phase A of the electrical equipment and the device of the invention;
FIG. 2 is a graph of pressure versus temperature without temperature compensation;
FIG. 3 is a schematic structural diagram of a pressure measurement instrument with temperature compensation function;
FIG. 4 is a graph of pressure versus temperature for temperature compensation.
In the attached figure 1, 1 is a pressure gauge A with temperature compensation; 2 pressure gauge B without temperature compensation; 3 a first communicating pipe; 4 a second communicating pipe; 4-1 second opening/closing valve; 4-2 a third opening and closing valve; 5SF6An air inlet pipe; 5-1 first opening/closing valve.
Detailed Description
The present invention is further described in detail below with reference to examples, but the scope of the present invention is not limited thereto, and the scope of the invention is set forth in the claims.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
The invention provides an SF6Temperature rise detection device of electrical equipment, SF6The electrical equipment comprises a phase A, a phase B and a phase C connection port, and the temperature rise detection device is respectively arranged on SF to be detected6Two SF blocks on phase A, phase B and phase C connection ports of electric equipment 66And a pressure gauge.
Two blocks of SF6One in the pressure gauge is a beltThe other pressure gauge is a pressure gauge B2 without temperature compensation, and the pressure gauge A1 with temperature compensation is used.
At each SF6The pressure gauge is internally and electrically connected with a control module 7.
The control module 7 is used for acquiring parameters acquired by a pressure gauge connected with the control module 7. I.e. each SF6After the pressure of the gas chamber of the phase is obtained in the pressure gauge, the data are transmitted to the control module 7, and the control module 7 calculates according to three state parameter relational expressions (p is rho Rt, R is a constant) of gas pressure-density-temperature (p-rho-t).
The control module and its corresponding SF6The pressure gauges are electrically connected through electric wires, and all the control modules are in wireless communication connection with the single chip microcomputer controller; the number of the single chip microcomputer controllers is one. And a control program is installed in the singlechip controller.
The control modules are in wireless communication connection; the singlechip controller is electrically connected with a display and an alarm.
In the invention, zigbee can be selected as a wireless communication mode for the transformer substation.
Two SF blocks installed in the same phase as shown in FIG. 16The pressure gauge is connected through a first communication pipe 3, the first communication pipe 3 is connected with SF to be measured6An L-shaped second communication pipe 4 is provided between the electrical devices 6.
The second communicating pipe 4 is provided with SF6An air inlet pipe 5 for supplying SF to be measured6Supply of SF to electrical equipment6A gas.
SF6The intake pipe 5 is provided with a first opening/closing valve 5-1.
A second on-off valve 4-1 is arranged on the second communicating pipe 4, and the second on-off valve 4-1 is positioned at SF6Between the inlet pipe 5 and the first communication pipe 3.
The second communicating pipe 4 is provided with a third opening and closing valve 4-2.
When the present invention is out of order, the maintenance operation can be performed by closing the first opening/closing valve 5-1, the second opening/closing valve 4-1, and the third opening/closing valve 4-2, respectively. The first opening and closing valve 5-1, the second opening and closing valve 4-1 and the third opening and closing valve 4-2 play a role of blocking the gas path of the invention.
When the invention is used, A, B, C phases are provided with two SF in each phase6Pressure gauge, each SF6After the pressure of the air chamber of the phase is obtained in the pressure gauge, the data are transmitted to the control module 7, and the control module 7 transmits the calculated data to the single chip microcomputer controller. And after calculation and comparison, determining whether the abnormal phase exists or not. The single chip microcomputer controller carries out judgment and comparison, the result is displayed in the display, and if the abnormal phase exists, the alarm gives an alarm.
The theoretical basis of the invention is as follows: from three state parameter relationships (p ═ ρ Rt, where R is a constant) of gas pressure-density-temperature (p- ρ -t), it can be seen that: when the ambient temperature is constant, the density changes in proportion to the change in pressure; when the ambient temperature changes and the density does not change, the pressure changes with the change of the temperature, as shown in fig. 2. According to SF6Physical characteristics of the gas, SF at a certain temperature in a closed container6The gas density may actually be represented by a pressure value. To maintain SF in a closed container6The gas pressure is not changed, and only the changed temperature is compensated. Currently SF6SF for electrical equipment6The gas pressure gauge is a pressure measurement type instrument with a temperature compensation function, and is shown in figure 3. SF to be detected as described in the present invention6Two SF are respectively arranged on three phases of the circuit breaker A, B, C6A pressure gauge, wherein the pressure gauge A with temperature compensation is a pressure measurement instrument with temperature compensation function shown in figure 3 and is used for monitoring SF6Whether there is a leak of gas. It measures SF by means of a measuring element6The pressure of the gas, and then the SF is fed through a temperature compensation element of the pressure gauge6Converting the gas pressure into a pressure measurement at 20 deg.C, using the pressure measurement (P)20Value) represents SF6Gas density value. When SF6When the density of the gas is constant, P20The values do not change with temperature, see fig. 4.
The use of the present invention and the calculation of the control module 7 and the one-chip microcomputer controller are explained as follows.
The use and application process of the arrangement of the invention comprises the following steps,
s1 in the detection of SF6The A, B, C three phases of the electrical equipment are respectively provided with two SF6Pressure gauge, said two blocks SF6The pressure gauges are respectively a pressure gauge A with temperature compensation and a pressure gauge B without temperature compensation; the whole electrical equipment is provided with six SF blocks6And a pressure gauge. Three pressure gauges A with temperature compensation and three pressure gauges B without temperature compensation are arranged in the pressure gauge.
In step S1, SF6Confirming the SF to be detected after the pressure gauge is installed6Presence or absence of SF in electrical equipment6Gas leakage in ensuring SF6Temperature rise detection and prediction can be carried out by using a subsequent method on the premise of no gas leakage; confirming whether SF exists in equipment to be detected or not by utilizing pressure change of pressure gauge A6Gas leakage, if the indication of the pressure gauge A is unchanged, indicating that SF does not occur6Gas leakage, if the indication of the pressure gauge A changes, indicating the occurrence of SF6If gas leaks, the leakage point is checked and repaired, and if gas leaks, the temperature rise test method cannot be used, and only the leakage point is checked and the repair is finished, so that SF is ensured6When the gas is not leaked, the subsequent steps are carried out. The pressure gauge A is used for monitoring the SF inside the equipment in real time6Whether gas leaks or not, and a pressure gauge B is used for monitoring the SF inside the equipment in real time6The pressure of the gas.
S2 calculating A, B, C phases of SF by using pressure value p and temperature value t of pressure gauge A6Gas density value ρA、ρB、ρC。
In S2, A, B, C phases of SF are calculated respectively by using the pressure value p and the temperature value t (20 ℃) of the pressure gauge A6Gas density value ρA、ρB、ρC，SF6When gas is not leaked ρA、ρB、ρCIs a constant value.
Specifically, in step S2, the pressure value P of the pressure gauge a and the compensated temperature value t corresponding thereto are substituted into equation (1) to obtain SF6A gas density ρ;
p＝0.57×10-4ρt(1+B)-ρ2A (1)；
wherein, P is a pressure value, Mpa; t is a temperature value, K; rho is density, kg/m3。
The coefficient A is obtained according to a formula (2), and the coefficient B is obtained according to a formula (3);
A＝0.75×10-4(1-0.727×10-3ρ) (2)；
B＝2.51×10-3ρ(1-0.846×10-3ρ) (3)；
rho is density, kg/m3。
Specifically, the compensation temperature of the pressure gauge a is 20 ℃, and the compensated temperature value t of the pressure gauge a is 20+ 273.5-293.5K;
respectively measuring the pressure value P of a pressure gauge A in A, B, C phasesA、PBAnd PcSubstituting the compensated temperature value t into the formula (1) to obtain the SF corresponding to A, B, C6Gas density ρA、ρBAnd ρC；ρASF corresponding to A6Gas density, kg/m3，ρBIs SF corresponding to B6Gas density, kg/m3，ρCIs SF corresponding to C6Gas density, kg/m3。
S3 using the current pressure value displayed by the pressure gauge B of A, B, C phase and SF combined with the step S26The gas density value calculates the current temperature value t of three phases of the equipment A, B, CVertical and horizontal A、tVertical and horizontal B、tVertical and horizontal C。
In step S3, the current pressure value P of the pressure gauge B is usedVertical and horizontal A、PVertical and horizontal B、PVertical and horizontal CAnd SF calculated at S26Gas density value ρA、ρB、ρCRespectively calculating current temperature values t of A, B, C three-phase equipment of the equipmentVertical and horizontal A、tVertical and horizontal B、tVertical and horizontal C。
Display the pressure gauge BCurrent pressure value P of displayVertical and horizontalAnd SF obtained in step (3)6Substituting the gas density value rho into the formula (1) to calculate the current temperature tVertical and horizontalAnd at the current temperature tVertical and horizontalCharacterization of SF6The actual temperature inside the electrical device. In step S3, the current pressure value P displayed by the pressure gauge B of phase AVertical and horizontal AAnd SF obtained in step S26Gas density value ρASubstituting the formula (1) to calculate the current temperature t of the A-phase equipmentVertical and horizontal A(ii) a Displaying the current pressure value P of the pressure gauge B of the phase BVertical and horizontal BAnd SF obtained in step S26Gas density value ρBSubstituting the formula (1) to calculate the current temperature t of the B-phase equipmentVertical and horizontal B(ii) a Displaying the current pressure value P of the pressure gauge B of the C phaseVertical and horizontal CAnd SF obtained in step S26Gas density value ρCSubstituting the formula (1) to calculate the current temperature t of the C-phase equipmentVertical and horizontal C。
S4 determines A, B, C the state of the three phases.
In step S4, t is selected based on the device state determination method of interplanetary evidencesVertical and horizontal A、tVertical and horizontal B、tVertical and horizontal CThe lowest temperature of the two phases is the standard phase, and the other two phases are the phases to be compared.
T is selected because the probability of A, B, C three-phase simultaneous overheating fault is basically zero in the operation process of the equipmentVertical and horizontal A、tVertical and horizontal B、tVertical and horizontal CThe smallest of these is the standard phase and the other two are the phases to be compared.
And determining whether the phase to be compared is in a normal state, an attention state or an abnormal state by calculating the temperature difference value of the phase to be compared and the standard phase, and further differentiating and maintaining equipment in a targeted operation mode.
For SF in abnormal state6The real-time temperature of the electrical equipment is predicted so as to accurately and timely arrange power failure for defect elimination work and ensure that the loss of power supply load is reduced to the maximum extent.
Specifically, in consideration of the difference between the temperature rise caused by the high load when the device operates and the actual temperature rise caused by the difference between the device structure, the installation position, and the illumination, the determination criterion of step S4 is to calculate the temperature difference between the phase to be compared and the standard phase, and determine the health status of the phase to be compared according to the temperature difference between the phase to be compared and the standard phase;
when the temperature difference is between 0K and 5K, the phase to be compared is in a normal state, and the equipment is normal and can continuously run at the moment;
when the temperature difference is 5K-10K, the phase to be compared is in an attention state, the inspection cycle of the phase to be compared is shortened, and monitoring is enhanced;
when the temperature difference is more than 10K, the phases to be compared are in an abnormal state, and other means are adopted to enhance monitoring and combine a power failure plan to timely develop hidden danger treatment work.
The method also comprises a step S5, wherein in the step S5, when the phase to be compared is in an abnormal state, the alarm gives an alarm. In the invention, the control module is combined with the singlechip controller, and an operation program is arranged in the control module and the singlechip controller according to the calculation method, so that whether the three phases have abnormal phases or not is judged, and if the three phases exist, an alarm is given in time. Preferably, the control module in the pressure gauge a respectively calculates A, B, C-phase SF by using the pressure value p and the temperature value t of the pressure gauge a6Gas density value ρA、ρB、ρC. The control module in the pressure gauge B utilizes the current pressure value displayed by the pressure gauge B of A, B, C phases and combines the obtained SF6Gas density value ρA、ρB、ρCCalculating the current temperature t of three phases of the equipment A, B, CVertical and horizontal A、tVertical and horizontal B、tVertical and horizontalC。
The single-chip microcomputer controller collects t of three phasesVertical and horizontal A、tVertical and horizontal B、tVertical and horizontal CSelecting tVertical and horizontal A、tVertical and horizontal B、tVertical and horizontal CThe lowest temperature of the two phases is the standard phase, and the other two phases are the phases to be compared. Determining whether the phase to be compared is in a normal state, an attention state or an abnormal state by calculating the temperature difference value of the phase to be compared and the standard phase, and comparing the temperature difference value with the reference temperatureThe judgment result of the phase is displayed on the display, and if the phase with abnormal state is judged, the alarm gives an alarm.
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