Gas-filled switchgear with partial discharge monitoring and response

Abstract

The present invention provides an inflatable switch cabinet with partial discharge monitoring and response functions, which relates to the field of switch cabinet insulation protection technology, including: a cabinet, a bushing, a detachable connector, a circuit breaker, a partial discharge data acquisition device and an industrial computer; the circuit breaker is electrically connected to the bushing to control the conduction and disconnection of the electrical in the bushing; the partial discharge data acquisition device collects partial discharge data and sends it to the industrial computer; the industrial computer determines the defect state of the inflatable switch cabinet according to the partial discharge data, and determines the response strategy according to the defect state; when the inflatable switch cabinet is powered off for maintenance, a power-off instruction is sent to the circuit breaker; the circuit breaker performs the power-off operation and feeds back a power-off completion signal to the industrial computer; the industrial computer is also used to control the operation of the drive component to disconnect the bushing and the detachable connector. This solution can improve the accuracy of partial discharge monitoring of the inflatable switch cabinet and the timeliness of partial discharge response, so as to reduce the probability of serious accidents caused by partial discharge.

Description

Technical Field

[0001] The present invention relates to the technical field of switch cabinet insulation protection, and in particular to an inflatable switch cabinet with partial discharge monitoring and response functions. Background Art

[0002] Gas-filled switchgear has been widely used in the field of power transmission and distribution due to its many advantages such as small footprint, low cost, simple structure and easy daily maintenance and overhaul. However, with the increase in its application, the number of insulation accidents occurring each year is also increasing year by year. Once an insulation failure occurs in the equipment, it will seriously affect the safe and stable operation of the power grid, causing serious property losses and posing a serious threat to personal safety. Therefore, it is necessary to use an effective partial discharge detection method to evaluate the insulation status of the gas-filled switchgear and to effectively identify and warn the early stages of insulation failures, so as to avoid major insulation failures in the gas-filled switchgear and improve the reliability of power supply in the power grid.

[0003] Traditional inflatable switchgear live detection mainly uses electrical quantity monitoring, that is, monitoring the sound, light, electromagnetic waves, current, voltage and temperature changes generated during the insulation degradation process, and evaluating whether partial discharge occurs inside the switchgear based on a single quantity. The monitoring accuracy is low; and traditional inflatable switchgear only has partial discharge monitoring function, which requires operators to take corresponding measures according to the monitoring results. The response rate is slow, which can easily cause more serious accidents. Summary of the invention

[0004] In view of this, in order to address the above shortcomings, it is necessary to propose an inflatable switchgear with partial discharge monitoring and response functions to improve the accuracy of partial discharge monitoring of the inflatable switchgear and the timeliness of partial discharge response, so as to reduce the probability of serious accidents caused by partial discharge.

[0005] The present invention provides an inflatable switch cabinet with partial discharge monitoring and response functions, comprising: a cabinet body, a bushing, a detachable connector, a circuit breaker, a partial discharge data acquisition device and an industrial computer; the bushing, the detachable connector and the partial discharge data acquisition device are all arranged inside the cabinet body; the detachable connector comprises a connecting component and a driving component, the bushing and the detachable connector are electrically connected through the connecting component, and the driving component is used to drive the connecting component to move so as to achieve electrical connection with the bushing; the circuit breaker is electrically connected to the industrial computer, and the partial discharge data acquisition device and the driving component are both connected to the industrial computer for communication;

[0006] The circuit breaker is electrically connected to the bushing and is used to control the conduction and disconnection of the electrical system in the bushing; the partial discharge data acquisition device is used to acquire at least two types of partial discharge data inside the cabinet, and send the acquired partial discharge data to the industrial computer; the industrial computer determines the defect state of the inflatable switch cabinet based on the partial discharge data, and determines a response strategy based on the defect state; when the response strategy includes powering off the inflatable switch cabinet for maintenance, a power-off instruction is sent to the circuit breaker; the circuit breaker performs a power-off operation upon receiving the power-off instruction, and feeds back a power-off completion signal to the industrial computer after the power-off operation is completed; the industrial computer is also used to control the drive component to work after receiving the power-off completion signal, so as to disconnect the electrical connection between the bushing and the detachable connector.

[0007] Preferably, the partial discharge data acquisition device includes a characteristic gas acquisition component and a partial discharge amount acquisition component; the characteristic gas acquisition component is used to collect characteristic gas data of characteristic gases generated by resin decomposition caused by partial discharge in the cabinet; the partial discharge amount acquisition component is used to collect partial discharge amount data generated by partial discharge.

[0008] Preferably, the characteristic gas collection component includes a characteristic gas sensor and a fan, the fan is used to draw the gas from the monitored area into the characteristic gas sensor, and the characteristic gas sensor is used to detect the incoming gas.

[0009] Preferably, a temperature and humidity sensor is also provided in the inflatable switch cabinet, and the temperature and humidity sensor is communicatively connected to the industrial computer for collecting temperature data and humidity data in the cabinet, and sending the collected temperature data and humidity data to the industrial computer.

[0010] Preferably, the industrial computer includes a main control module, a storage module and a processing module;

[0011] The storage module is used to pre-configure a characteristic gas determination set, a partial discharge amount determination set and a partial discharge response strategy set; wherein the characteristic gas determination set includes at least one characteristic gas determination subset, each characteristic gas determination subset includes a mapping relationship between a gas concentration value of a characteristic gas and a defect state, and the partial discharge amount determination set includes a mapping relationship between a partial discharge amount value and a defect state; the partial discharge response strategy set includes execution strategies for dealing with at least two defect states;

[0012] The processing module is used to correct the characteristic gas determination set and the partial discharge determination set according to the received temperature data and humidity data, and use the corrected characteristic gas determination set to determine the received characteristic gas data, and use the corrected partial discharge determination set to determine the partial discharge data, and determine the defect state of the inflatable switchgear based on the result of the characteristic gas data determination and the result of the partial discharge data determination; the processing module is also used to search the execution strategy corresponding to the current defect state from the storage module according to the determined defect state;

[0013] The main control module performs instruction control on the corresponding equipment according to the execution strategy to implement a response strategy for coping with the defect state.

[0014] Preferably, the processing module is used to increase the gas concentration value corresponding to each defect state in the characteristic gas judgment set, and increase the local discharge value corresponding to each defect state in the local discharge amount judgment set when the temperature data is greater than the upper limit value of the preset temperature data safety range, and / or the humidity data is greater than the upper limit value of the preset humidity data safety range; and the processing module is also used to reduce the gas concentration value corresponding to each defect state in the characteristic gas judgment set, and reduce the local discharge value corresponding to each defect state in the local discharge amount judgment set when the temperature data is less than the lower limit value of the preset temperature data safety range, and / or the humidity data is less than the lower limit value of the preset humidity data safety range.

[0015] Preferably, the sleeve includes a conductor, an insulating sleeve, a first metal shielding layer and a second metal shielding layer; the insulating sleeve is sleeved on the outside of the conductor, the first metal shielding layer and the second metal shielding layer are both cylindrical structures, and the diameter of the first metal shielding layer is smaller than the diameter of the second metal shielding layer; the first metal shielding layer and the second metal shielding layer are coaxially sleeved on the outside of the conductor, and the first metal shielding layer is fixedly connected to the conductor, and the second metal shielding layer is fixedly connected to the grounding end.

[0016] Preferably, the connection assembly comprises a connecting rod, a third shielding layer and a fixing member; the fixing member is a barrel-shaped structure, the third shielding layer is fixedly arranged on the side surface and the bottom surface inside the fixing member, one end of the connecting rod is provided with an external thread for matching and connecting with the internal thread inside the casing conductor, and the other end of the connecting rod extends into the third shielding layer and is fixedly connected with the bottom end of the third shielding layer;

[0017] The drive assembly includes a double-output shaft drive motor and at least two sets of slide rails; the at least two sets of slide rails are fixedly arranged on the inner surface of the lateral side and are arranged laterally; the double-output shaft drive motor is slidably arranged on each slide rail, the first output shaft of the double-output shaft drive motor is fixedly connected to the outer bottom surface of the fixing member, and the second output shaft faces the tail end direction; an auxiliary drive plate is also fixedly arranged at a position near the tail end on the lateral side of the detachable connector, and the surface of the auxiliary drive plate is perpendicular to the second output shaft; a through hole is opened at a position of the auxiliary drive plate facing the second output shaft, and the through hole is provided with an internal thread, and the second output shaft is provided with an external thread for matching and connecting with the internal thread provided in the through hole; wherein the installation position of the auxiliary drive plate satisfies: when the connecting rod is separated from the sleeve conductor, the external thread of the second output shaft has been matched and connected with the internal thread of the through hole, so that after the connecting rod is separated from the sleeve conductor, the double-output shaft drive motor continues to be driven to move through the internal thread of the through hole and the external thread of the second output shaft.

[0018] Preferably, the inflatable switch cabinet further comprises an alarm indication component, which is electrically connected to the industrial computer and is used for displaying a corresponding signal according to the defect state determined by the industrial computer.

[0019] Preferably, there are three bushings and detachable connectors in the cabinet, which are respectively corresponding to the three phases A, B, and C. The partial discharge data acquisition devices also include three devices, which are respectively corresponding to the acquisition of characteristic gas data and local discharge data near the detachable connector of each phase; the industrial computer is also used to determine the detachable connector or bushing in a defective state according to the concentration value represented by the characteristic gas data and the discharge value represented in the local discharge data sent by each partial discharge acquisition device, and indicate the detachable connector or bushing in a defective state through the alarm indication component, so that the operator can quickly check and repair it.

[0020] It can be seen from the above technical scheme that the inflatable switch cabinet with partial discharge monitoring and response functions provided by the present invention includes a cabinet, a bushing, a detachable connector, a circuit breaker, a partial discharge data acquisition device and an industrial computer. The bushing and the detachable connector are located inside the cabinet and are electrically connected through a connecting component, and the driving component in the detachable connector can drive the connecting component to move; the circuit breaker and the bushing are electrically connected and can be used to control the conduction and disconnection of the power supply in the bushing. The partial discharge data acquisition device can collect at least two types of partial discharge data inside the cabinet, and send the collected partial discharge data to the industrial computer. The industrial computer can determine the defect state of the inflatable switch cabinet based on the received partial discharge data, and determine the response strategy based on the defect state. When the response strategy includes powering off the inflatable switch cabinet for maintenance, the industrial computer will send a power-off command to the circuit breaker, and the circuit breaker will perform a power-off operation after receiving the power-off command to disconnect the power supply in the bushing. After determining that the circuit breaker has completed the power-off operation, the industrial computer will control the drive component to work, thereby disconnecting the electrical connection between the bushing and the detachable connector. It can be seen that this solution detects the defect state of the inflatable switchgear based on at least two types of partial discharge data, which greatly improves the accuracy of partial discharge monitoring compared to the detection method of a single parameter. Moreover, the corresponding response strategy can be determined according to the partial discharge monitoring results, and then the corresponding response measures are automatically executed, which greatly improves the timeliness of the partial discharge response and avoids the occurrence of serious accidents caused by insufficient partial discharge response. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of an inflatable switch cabinet with partial discharge monitoring and response functions provided in an embodiment of the present invention.

[0022] Figure 2 A schematic diagram of a characteristic gas collection component provided in an embodiment of the present invention.

[0023] Figure 3 A schematic diagram of assembling a sleeve and a detachable connector provided in an embodiment of the present invention.

[0024] Figure 4 A schematic diagram of a detachable connector provided in an embodiment of the present invention.

[0025] In the figure: cabinet 10, bushing 20, conductor 21, insulating sleeve 22, first metal shielding layer 23, second metal shielding layer 24, detachable connector 30, connecting component 31, connecting rod 311, third shielding layer 312, fixing part 313, driving component 32, double-output shaft driving motor 321, first output shaft 3211, second output shaft 3212, slide rail 322, auxiliary driving board 323, circuit breaker 40, partial discharge data acquisition device 50, characteristic gas acquisition component 51, characteristic gas sensor 511, fan 512, partial discharge amount acquisition component 52, industrial computer 60. DETAILED DESCRIPTION

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] See also Figure 1-4 The present invention provides an inflatable switch cabinet with partial discharge monitoring and response functions, comprising: a cabinet body 10, a bushing 20, a detachable connector 30, a circuit breaker 40, a partial discharge data acquisition device 50 and an industrial computer 60; the bushing 20, the detachable connector 30 and the partial discharge data acquisition device 50 are all arranged inside the cabinet body 10; the detachable connector 30 comprises a connecting component 31 and a driving component 32, the bushing 20 and the detachable connector 30 are electrically connected through the connecting component 31, and the driving component 32 is used to drive the connecting component 31 to move so as to achieve electrical connection with the bushing 20; the circuit breaker 40 is electrically connected to the industrial computer 60, and the partial discharge data acquisition device 50 and the driving component 32 are both communicatively connected to the industrial computer 60;

[0028] The circuit breaker 40 is electrically connected to the bushing 20, and is used to control the conduction and disconnection of the electrical system in the bushing 20; the partial discharge data acquisition device 50 is used to collect at least two types of partial discharge data inside the cabinet 10, and send the collected partial discharge data to the industrial computer 60; the industrial computer 60 determines the defect state of the inflatable switch cabinet according to the partial discharge data, and determines the response strategy according to the defect state; when the response strategy includes powering off the inflatable switch cabinet for maintenance, a power-off instruction is sent to the circuit breaker 40; the circuit breaker 40 performs a power-off operation when receiving the power-off instruction, and feeds back a power-off completion signal to the industrial computer 60 after the power-off operation is completed; the industrial computer 60 is also used to control the drive component 32 to work after receiving the power-off completion signal, so as to disconnect the electrical connection between the bushing 20 and the detachable connector 30.

[0029] In this embodiment, the defect state of the inflatable switchgear is detected based on at least two types of partial discharge data, which greatly improves the accuracy of partial discharge monitoring compared to the detection method of a single parameter. Moreover, the corresponding response strategy can be determined according to the partial discharge monitoring results, and then the corresponding response measures are automatically executed, which greatly improves the timeliness of the partial discharge response and avoids the occurrence of serious accidents caused by the partial discharge response not being timely.

[0030] The cabinet 10 may be provided with at least four independent closed cavities. Figure 1As shown in the figure, a closed cavity is provided on the right side for installing the circuit breaker 40; three closed cavities are provided on the left side from top to bottom, a driving device for driving the circuit breaker 40 to open and close is provided in the upper closed cavity, an industrial computer 60 is provided in the middle closed cavity, a bushing 20 and a detachable connector 30 are provided in the lower closed cavity, and the lower closed cavity is respectively provided with bushings 20 and detachable connectors 30 of the three phases A, B and C, and a partial discharge data acquisition device 50 is provided in the lower closed cavity for collecting partial discharge data at the bushing 20 and the detachable connector 30 in the lower closed cavity.

[0031] Specifically, in order to improve the accuracy of partial discharge monitoring, it is considered to collect at least two types of partial discharge data. Therefore, in one embodiment, the partial discharge data acquisition device 50 may include a characteristic gas acquisition component 51 and a local discharge amount acquisition component 52; the characteristic gas acquisition component 51 is used to collect characteristic gas data of characteristic gases generated by resin decomposition caused by partial discharge in the cabinet 10; the local discharge amount acquisition component 52 is used to collect local discharge amount data generated by local discharge. In this way, the two types of parameters, local discharge amount detection and characteristic gas detection, are used as the basis for judging the defect state of the inflatable switch cabinet at the same time, which can greatly improve the accuracy of the defect state monitoring results. The characteristic gases may include hydrogen data, carbon monoxide data, and volatile organic compounds VOC, etc.

[0032] In order to further improve the sensitivity and accuracy of the data collected by the characteristic gas collection component 51, in one embodiment, the characteristic gas collection component 51 may include a characteristic gas sensor 511 and a fan 512. The fan 512 is used to extract the gas from the monitored part into the characteristic gas sensor 511, and the characteristic gas sensor 511 is used to detect the incoming gas. In this embodiment, the fan 512 can extract the surrounding gas into the characteristic gas sensor 511, and the characteristic gas sensor 511 performs data collection and detection on the incoming gas. In this way, when the characteristic gas is just generated or the amount of the characteristic gas generated is small, it can be timely transported to the characteristic gas sensor 511 for collection and detection through the fan 512, thereby greatly improving the sensitivity and accuracy of the characteristic gas data collected by the characteristic gas collection component 51.

[0033] For the sleeve 20, in order to improve the shielding effect of the sleeve 20 and reduce the occurrence of partial discharge faults caused by excessive electric fields, it is considered to set a double shielding layer in the sleeve 20. Specifically, in one embodiment, the sleeve 20 may include a conductor 21, an insulating sleeve 22, a first metal shielding layer 23 and a second metal shielding layer 24; the insulating sleeve 22 is sleeved on the outside of the conductor 21, the first metal shielding layer 23 and the second metal shielding layer 24 are both cylindrical structures, and the diameter of the first metal shielding layer 23 is smaller than the diameter of the second metal shielding layer 24; the first metal shielding layer 23 and the second metal shielding layer 24 are coaxially sleeved on the outside of the conductor 21, and the first metal shielding layer 23 is fixedly connected to the conductor 21, and the second metal shielding layer 24 is fixedly connected to the grounding terminal. In this embodiment, by setting the inner and outer shielding layers of the first metal shielding layer 23 and the second metal shielding layer 24, the electric field distribution on the surface of the sleeve 20 can be optimized, and the occurrence of partial discharge faults caused by excessive electric fields can be greatly reduced.

[0034] The detachable connector 30 may include a connection component 31 and a drive component 32, wherein the drive component 32 is used to drive the connection component 31 to move, thereby realizing the connection and disconnection between the detachable connector 30 and the sleeve 20. Specifically, in one embodiment, the connection component 31 may include a connection rod 311, a third shielding layer 312, and a fixing member 313; the fixing member 313 is a barrel-shaped structure, the third shielding layer 312 is fixedly arranged on the side and bottom surfaces inside the fixing member 313, one end of the connection rod 311 is provided with an external thread for matching and connecting with the internal thread inside the conductor 21 of the sleeve 20, and the other end of the connection rod 311 extends into the third shielding layer 312 and is fixedly connected to the bottom end of the third shielding layer 312;

[0035] The drive assembly 32 may include a double-output shaft drive motor 321 and at least two sets of slide rails 322; at least two sets of slide rails 322 are fixedly arranged on the inner surface of the lateral side and are arranged in the lateral direction; the double-output shaft drive motor 321 is slidably arranged on each slide rail 322, the first output shaft 3211 of the double-output shaft drive motor 321 is fixedly connected to the outer bottom surface of the fixing member 313, and the second output shaft 3212 faces the tail end direction; an auxiliary drive plate 323 is also fixedly arranged at a position near the tail end on the lateral side of the detachable connector 30, and the surface of the auxiliary drive plate 323 is perpendicular to the second output shaft 3212; the auxiliary drive plate A through hole is provided on 323 at a position directly opposite to the second output shaft 3212, and the through hole is provided with an internal thread, and the second output shaft 3212 is provided with an external thread for matching and connecting with the internal thread provided in the through hole; wherein, the installation position of the auxiliary drive plate 323 satisfies: when the connecting rod 311 is separated from the conductor 21 of the sleeve 20, the external thread of the second output shaft 3212 has been matched and connected with the internal thread of the through hole, so that after the connecting rod 311 is separated from the conductor 21 of the sleeve 20, the dual-output shaft drive motor 321 continues to be driven to move through the matching of the internal thread of the through hole and the external thread of the second output shaft 3212.

[0036] In this embodiment, when disconnecting the separable connector 30 and the sleeve 20, after the external thread of the connecting rod 311 and the internal thread of the conductor 21 of the sleeve 20 are disengaged, the external thread of the second output shaft 3212 of the double output shaft drive motor 321 can be matched with the internal thread on the auxiliary drive plate 323, so that the double output shaft drive motor 321 can continue to move backward, and the connection rod 311 and the copper terminal on the longitudinal side can be separated. Similarly, when connecting the separable connector 30 and the sleeve 20, the first output shaft 3211 and the double output shaft drive motor 321 can be transported forward by the external thread of the second output shaft 3212 of the double output shaft drive motor 321 and the internal thread on the auxiliary drive plate 323, so that the external thread of the first output shaft 3211 and the internal thread of the conductor 21 of the sleeve 20 can be matched, thereby realizing the connection between the sleeve 20 and the separable connector 30.

[0037] Since the temperature and humidity data in the inflatable switch cabinet will affect the defect status monitoring, in one embodiment, a temperature and humidity sensor is also provided in the inflatable switch cabinet. The temperature and humidity sensor is communicated with the industrial computer 60 and is used to collect the temperature data and humidity data in the cabinet body 10, and send the collected temperature data and humidity data to the industrial computer 60.

[0038] The industrial computer 60 is used to perform data processing and control operations. Specifically, in one embodiment, the industrial computer 60 may include a main control module, a storage module, and a processing module;

[0039] The storage module is used to pre-configure a characteristic gas determination set, a partial discharge amount determination set and a partial discharge response strategy set; wherein the characteristic gas determination set includes at least one characteristic gas determination subset, each characteristic gas determination subset includes a mapping relationship between a gas concentration value of a characteristic gas and a defect state, and the partial discharge amount determination set includes a mapping relationship between a partial discharge amount value and a defect state; the partial discharge response strategy set includes execution strategies for dealing with at least two defect states;

[0040] A processing module, used to correct the characteristic gas determination set and the partial discharge determination set according to the received temperature data and humidity data, and use the corrected characteristic gas determination set to determine the received characteristic gas data, and use the corrected partial discharge determination set to determine the partial discharge data, and determine the defect state of the inflatable switchgear based on the result of the characteristic gas data determination and the result of the partial discharge data determination; the processing module is also used to search the storage module for the execution strategy corresponding to the current defect state according to the determined defect state;

[0041] The main control module controls the corresponding equipment according to the execution strategy to implement the response strategy for the defect state.

[0042] In this embodiment, the defect state of the inflatable switchgear is judged based on multiple parameters such as characteristic gas and partial discharge, which solves the problem of poor accuracy of single parameter defect state monitoring. In addition, since different temperature and humidity environments also have an impact on the insulation state, this solution modifies the judgment set by temperature and humidity, fully considering the impact of temperature and humidity on the defect state, thereby further improving the monitoring accuracy of the defect state of the inflatable switchgear.

[0043] Specifically, consider pre-storing the characteristic gas and partial discharge determination sets, as well as the partial discharge response strategy set in the storage module, wherein the characteristic gas determination set should include the mapping relationship between the gas concentration and the defect state for multiple characteristic gases, the partial discharge determination set should include the mapping relationship between the partial discharge value and the defect state, and the partial discharge response strategy set should include the control operations corresponding to various defect states. For example, the partial discharge determination set can be: when P<30pC, the defect state is good; when 30pC≤P<100pC, it is a general defect state; when 100pC≤P<1000pC, it is a serious defect state; when P≥1000pC, it is an emergency defect state; where P is the partial discharge data of the three phases ABC. The characteristic gas judgment set may include: when C1<5ppm, the defect state is good; when 5ppm≤C1<30ppm, it is a general defect state; when 30ppm≤C1<50ppm, it is a serious defect state; when C1≥50ppm, it is an emergency defect state; where C1 is the characteristic gas carbon monoxide data. When C2<25ppm, the defect state is good; when 25ppm≤C2<150ppm, it is a general defect state; when 150ppm≤C2<250ppm, it is a serious defect state; when C2≥250ppm, it is an emergency defect state; where C2 is the characteristic gas hydrogen data. When C3<10ppm, the defect state is good; when 10ppm≤C3<60ppm, it is a general defect state; when 60ppm≤C3<100ppm, it is a serious defect state; when C3≥100ppm, it is an emergency defect state; where C3 is the characteristic gas volatile organic compound VOC data. For the partial discharge response strategy set: when the defect state is good, no control is performed and normal data monitoring continues; when the defect state is a general defect state, close monitoring is performed and an early warning message is sent; when the defect state is a serious defect state, the circuit breaker 40 is controlled to be disconnected, and after the circuit breaker 40 is disconnected, the detachable connector 30 and the bushing 20 are gradually controlled to be disconnected; when the defect state is a serious defect state, the circuit breaker 40 is controlled to be disconnected, and an emergency state alarm message is sent.

[0044] For the processing module, consider revising the characteristic gas determination set and the local discharge determination set according to the temperature and humidity data. Specifically, when the temperature data is greater than the upper limit of the preset temperature data safety range, and / or the humidity data is greater than the upper limit of the preset humidity data safety range, the gas concentration value corresponding to each defect state in the characteristic gas determination set is increased, and the local discharge value corresponding to each defect state in the local discharge determination set is increased; and the processing module is also used to reduce the gas concentration value corresponding to each defect state in the characteristic gas determination set, and reduce the local discharge value corresponding to each defect state in the local discharge determination set when the temperature data is less than the lower limit of the preset temperature data safety range, and / or the humidity data is less than the lower limit of the preset humidity data safety range.

[0045] For example, the temperature data safety range can be 10℃-40℃, and the humidity data safety range can be 20%-80%. When the collected temperature data is outside the safety range of 10℃-40℃, or the collected humidity data is outside the safety range of 20%-80%, or the collected temperature data is outside the safety range of 10℃-40℃, and the collected humidity data is outside the safety range of 20%-80%, that is, when at least one of the temperature data and humidity data is outside the safety range, consider revising the characteristic gas judgment set and the partial discharge judgment set to adapt to the impact of different environmental conditions on the defect state and improve the accuracy of defect state monitoring.

[0046] Of course, the correction amount, that is, the increase or decrease amount, can be determined according to the amount exceeding the safety range. For example, a proportional coefficient corresponding table can be pre-configured first; wherein the proportional coefficient corresponding table includes the corresponding relationship between the difference between the temperature data and the boundary value of the temperature data safety range and the temperature proportional coefficient, and the corresponding relationship between the difference between the humidity data and the boundary value of the humidity data safety range and the humidity proportional coefficient; then when the temperature data exceeds the temperature data safety range, and / or the humidity data exceeds the humidity data safety range, the temperature difference between the temperature data and the nearest boundary of the temperature safety range is calculated, and the humidity difference between the humidity data and the nearest boundary of the humidity safety range is calculated; further, the proportional coefficient values ​​corresponding to the temperature difference and the humidity difference are queried from the proportional coefficient corresponding table respectively; further, the largest proportional coefficient among the proportional coefficients corresponding to the queried temperature difference and humidity difference is determined as the target correction proportional coefficient of the gas concentration value and the partial discharge value; finally, the correction amount of the gas concentration value and the partial discharge value is determined according to the target correction proportional coefficient.

[0047] For example, the pre-configured proportional coefficient correspondence table is shown in Table 1 below, where T is the collected temperature value, T L is the lower limit of the temperature data safety range, TH is the upper limit of the temperature data safety range, H is the collected humidity data, and H L is the lower limit of the humidity data safety range, H H The upper limit of the humidity data safety range:

[0048] Table 1

[0049]

[0050] For example, when the collected temperature data is greater than the upper limit of the temperature data safety range, and the difference with the upper limit of the temperature data safety range is 15°C, the corresponding correction coefficient is 20%, then the correction amount of the gas concentration is 20% of the original gas concentration value, and the correction amount of the partial discharge is 20% of the original partial discharge value. As in the above example, the partial discharge judgment set is when P<30pC, it is good insulation; when 30pC≤P<100pC, it is a general defect; when 100pC≤P<1000pC, it is a serious defect; when P≥1000pC, it is an emergency defect; then after correction, each boundary is increased by 20% of itself, that is, when P<36pC, it is good insulation; when 36pC≤P<120pC, it is a general defect; when 120pC≤P<1200pC, it is a serious defect; when P≥1200pC, it is an emergency defect; similarly, the correction method of the characteristic gas judgment set is the same.

[0051] Of course, if the proportionality coefficient corresponding to temperature is 20% and the proportionality coefficient corresponding to humidity is 30%, the higher 30% will be used as the proportionality coefficient for correcting the characteristic gas determination set and the partial discharge amount determination set.

[0052] Further, the defective state of the characteristic gas data and the partial discharge amount data is determined using the corrected characteristic gas determination set and the partial discharge amount determination set. Further, the defective state of the inflatable switchgear is determined based on the result of the determination using the characteristic gas data and the result of the determination using the partial discharge amount data. For example, if both the characteristic gas defective state and the partial discharge amount defective state are good insulation, the defective state of the inflatable switchgear is good insulation; if only one of the characteristic gas defective state and the partial discharge amount defective state is good insulation, the defective state of the inflatable switchgear is a general defect; if both the characteristic gas defective state and the partial discharge amount defective state are not good insulation, the defective state is a more serious defective state of the characteristic gas defective state and the partial discharge amount defective state.

[0053] In addition, the inflatable switch cabinet can also include an alarm indication component, which is electrically connected to the industrial computer 60 and is used to display a corresponding signal according to the defect state determined by the industrial computer 60, thereby prompting the operator of the current state of the inflatable switch cabinet.

[0054] Furthermore, there are three bushings 20 and detachable connectors 30 in the cabinet 10, which are used to correspond to the three phases A, B, and C respectively. The partial discharge data acquisition devices 50 can also include three, which are used to respectively collect the characteristic gas data and partial discharge data near the detachable connector 30 of each phase; the industrial computer 60 is also used to determine the detachable connector 30 or bushing 20 in a defective state according to the concentration value represented by the characteristic gas data sent by each partial discharge acquisition device and the discharge value represented in the partial discharge data, and indicate the detachable connector 30 or bushing 20 in a defective state through the alarm indication component, so that the operator can quickly check and repair it. In this way, by performing data acquisition through different partial discharge data acquisition devices 50, the industrial computer 60 can determine which phase of the detachable connector 30 and bushing 20 currently has a defective fault according to the difference in the collected data, so as to facilitate the operator to quickly locate the fault location.

[0055] The modules or units in the device of the embodiment of the present invention can be combined, divided and deleted according to actual needs. The above disclosure is only the preferred embodiment of the present invention, and of course it cannot be used to limit the scope of the rights of the present invention. Those skilled in the art can understand that all or part of the processes of the above embodiment are implemented, and the equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. An inflatable switchgear with partial discharge monitoring and response functions, characterized in that: include: A cabinet, a bushing, a detachable connector, a circuit breaker, a partial discharge data acquisition device and an industrial computer; the bushing, the detachable connector and the partial discharge data acquisition device are all arranged inside the cabinet; the detachable connector includes a connecting component and a driving component, the bushing and the detachable connector are electrically connected through the connecting component, and the driving component is used to drive the connecting component to move so as to achieve electrical connection with the bushing; the circuit breaker is electrically connected to the industrial computer, and the partial discharge data acquisition device and the driving component are both connected to the industrial computer for communication; The circuit breaker is electrically connected to the bushing and is used to control the conduction and disconnection of the electrical system in the bushing; the partial discharge data acquisition device is used to collect at least two types of partial discharge data inside the cabinet, and send the collected partial discharge data to the industrial computer; the industrial computer determines the defect state of the inflatable switch cabinet according to the partial discharge data, and determines the response strategy according to the defect state; when the response strategy includes powering off the inflatable switch cabinet for maintenance, a power-off instruction is sent to the circuit breaker; the circuit breaker performs a power-off operation upon receiving the power-off instruction, and feeds back a power-off completion signal to the industrial computer after the power-off operation is completed; the industrial computer is also used to control the drive component to work after receiving the power-off completion signal, so as to disconnect the electrical connection between the bushing and the detachable connector; The partial discharge data acquisition device comprises a characteristic gas acquisition component and a partial discharge quantity acquisition component; the characteristic gas acquisition component is used to collect characteristic gas data of characteristic gas generated by resin decomposition caused by partial discharge in the cabinet; the partial discharge quantity acquisition component is used to collect partial discharge quantity data generated by partial discharge; The characteristic gas collection component includes a characteristic gas sensor and a fan, the fan is used to draw the gas from the monitored part into the characteristic gas sensor, and the characteristic gas sensor is used to detect the incoming gas; The sleeve comprises a conductor, an insulating sleeve, a first metal shielding layer and a second metal shielding layer; the insulating sleeve is sleeved on the outside of the conductor, the first metal shielding layer and the second metal shielding layer are both cylindrical structures, and the diameter of the first metal shielding layer is smaller than the diameter of the second metal shielding layer; the first metal shielding layer and the second metal shielding layer are coaxially sleeved on the outside of the conductor, and the first metal shielding layer is fixedly connected to the conductor, and the second metal shielding layer is fixedly connected to the grounding end; The connecting assembly comprises a connecting rod, a third shielding layer and a fixing member; the fixing member is a barrel-shaped structure, the third shielding layer is fixedly arranged on the side and bottom surfaces inside the fixing member, one end of the connecting rod is provided with an external thread for matching and connecting with the internal thread inside the conductor of the sleeve, and the other end of the connecting rod extends into the third shielding layer and is fixedly connected with the bottom end of the third shielding layer; The drive assembly includes a double-output shaft drive motor and at least two sets of slide rails; the at least two sets of slide rails are fixedly arranged on the inner surface of the lateral side and are arranged laterally; the double-output shaft drive motor is slidably arranged on each slide rail, the first output shaft of the double-output shaft drive motor is fixedly connected to the outer bottom surface of the fixing member, and the second output shaft faces the tail end direction; an auxiliary drive plate is also fixedly arranged at a position near the tail end on the lateral side of the detachable connector, and the surface of the auxiliary drive plate is perpendicular to the second output shaft; a through hole is opened at a position of the auxiliary drive plate facing the second output shaft, and the through hole is provided with an internal thread, and the second output shaft is provided with an external thread for matching and connecting with the internal thread provided in the through hole; wherein the installation position of the auxiliary drive plate satisfies: when the connecting rod is separated from the sleeve conductor, the external thread of the second output shaft has been matched and connected with the internal thread of the through hole, so that after the connecting rod is separated from the sleeve conductor, the double-output shaft drive motor continues to be driven to move through the internal thread of the through hole and the external thread of the second output shaft.

2. The inflatable switchgear with partial discharge monitoring and response function according to claim 1 is characterized in that: The inflatable switch cabinet is also provided with a temperature and humidity sensor, which is communicatively connected with the industrial computer and is used for collecting temperature data and humidity data in the cabinet and sending the collected temperature data and humidity data to the industrial computer.

3. The inflatable switchgear with partial discharge monitoring and response function according to claim 2 is characterized in that: The industrial computer includes a main control module, a storage module and a processing module; The storage module is used to pre-configure a characteristic gas determination set, a partial discharge amount determination set and a partial discharge response strategy set; wherein the characteristic gas determination set includes at least one characteristic gas determination subset, each characteristic gas determination subset includes a mapping relationship between a gas concentration value of a characteristic gas and a defect state, and the partial discharge amount determination set includes a mapping relationship between a partial discharge amount value and a defect state; the partial discharge response strategy set includes execution strategies for dealing with at least two defect states; The processing module is used to correct the characteristic gas determination set and the partial discharge determination set according to the received temperature data and humidity data, and use the corrected characteristic gas determination set to determine the received characteristic gas data, and use the corrected partial discharge determination set to determine the partial discharge data, and determine the defect state of the inflatable switchgear based on the result of the characteristic gas data determination and the result of the partial discharge data determination; the processing module is also used to search the execution strategy corresponding to the current defect state from the storage module according to the determined defect state; The main control module performs instruction control on the corresponding equipment according to the execution strategy to implement a response strategy for coping with the defect state.

4. The inflatable switchgear with partial discharge monitoring and response function according to claim 3 is characterized in that: The processing module is used to increase the gas concentration value corresponding to each defect state in the characteristic gas judgment set, and increase the local discharge value corresponding to each defect state in the local discharge amount judgment set when the temperature data is greater than the upper limit value of the preset temperature data safety range, and / or the humidity data is greater than the upper limit value of the preset humidity data safety range; and the processing module is also used to reduce the gas concentration value corresponding to each defect state in the characteristic gas judgment set, and reduce the local discharge value corresponding to each defect state in the local discharge amount judgment set when the temperature data is less than the lower limit value of the preset temperature data safety range, and / or the humidity data is less than the lower limit value of the preset humidity data safety range.

5. The inflatable switchgear with partial discharge monitoring and response function according to claim 1, characterized in that: The inflatable switch cabinet also includes an alarm indication component, which is electrically connected to the industrial control computer and is used to display a corresponding signal according to the defect state determined by the industrial control computer.

6. The inflatable switchgear with partial discharge monitoring and response function according to claim 5, characterized in that: There are three bushings and detachable connectors in the cabinet, which are respectively corresponding to the three phases A, B, and C. The partial discharge data acquisition devices also include three devices, which are respectively corresponding to the acquisition of characteristic gas data and partial discharge data near the detachable connector of each phase; the industrial computer is also used to determine the detachable connector or bushing in a defective state according to the concentration value represented by the characteristic gas data and the discharge value represented in the partial discharge data sent by each partial discharge acquisition device, and indicate the detachable connector or bushing in a defective state through the alarm indication component, so that the operator can quickly check and repair it.

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