CN109212394B - Partial discharge monitoring system of high-voltage switch cabinet - Google Patents
Partial discharge monitoring system of high-voltage switch cabinet Download PDFInfo
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- CN109212394B CN109212394B CN201811279768.1A CN201811279768A CN109212394B CN 109212394 B CN109212394 B CN 109212394B CN 201811279768 A CN201811279768 A CN 201811279768A CN 109212394 B CN109212394 B CN 109212394B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1209—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using acoustic measurements
Abstract
The invention provides a partial discharge monitoring system of a high-voltage switch cabinet, which comprises a device room, a switch cabinet arranged in the device room, an X-axis moving mechanism arranged at the upper part of the device room, a Y-axis moving mechanism arranged on the X-axis moving mechanism and a monitoring mechanism arranged at the lower end of the Y-axis moving mechanism, wherein the monitoring mechanism comprises a telescopic rod vertically arranged downwards at the lower end of the Y-axis moving mechanism, a U-shaped mounting frame is horizontally arranged at the lower end of the telescopic rod, ultrasonic sensors are arranged at three different positions on the mounting frame, and the ultrasonic sensors are sequentially connected with a control center through a control mechanism and a communication mechanism in a signal manner. The invention can detect the discharge position of the switch cabinet, and mainly can finish the detection of all the switch cabinets by only arranging one set of sensors in the equipment room, has low cost investment and is more beneficial to popularization and use.
Description
Technical Field
The invention relates to the technical field of switch cabinet monitoring, in particular to a high-voltage switch cabinet partial discharge monitoring system.
Background
Practices in recent years show that partial discharge is a main cause of insulation degradation of a switch cabinet and finally insulation accidents. Insulation faults are often accompanied by the generation of partial discharges. The partial discharge is the discharge which occurs between the electrodes but does not penetrate the electrodes, and is characterized in that the phenomenon of repeated breakdown and extinction occurs under the action of high electric field intensity due to the weakness in the insulation of equipment or the defect in the production process, and the partial discharge is represented by the breakdown of gas in the insulation, the partial breakdown of solid or liquid medium in a small range, the partial breakdown discharge caused by the concentration of field intensity at the edge and sharp corner part of the metal surface, and the like. The energy of this discharge is small, so its short-term presence does not affect the insulation strength of the electrical device. However, if the insulation of the electrical equipment is continuously subjected to partial discharge under the operating voltage, the weak discharge will generate cumulative effect, so that the dielectric property of the insulation is gradually deteriorated and the partial defect is enlarged, and finally the whole insulation breakdown is caused. Partial discharge is thus a potential hazard for switchgear.
Currently, there are six main discharge detection methods, including Ultrasonic (UT), chemical, optical, pulsed current (ERA), radio frequency (rf) and Ultra High Frequency (UHF) partial discharge detection. In recent years, with the improvement of the sensitivity of an acoustic-electric element and the development of an electronic signal amplification technology, as a representative of non-contact detection, the advantages possessed by an ultrasonic detection method are more and more remarkable, and the advantages of high sensitivity of ultrasonic detection are also added, so that the development prospect of ultrasonic detection is the best compared with other detection methods.
The publication 108333485a discloses a switchgear partial discharge monitoring system comprising: the system comprises a plurality of field detection modules, a monitoring center module and a plurality of remote terminals, wherein the field detection modules comprise an ultrasonic measurement unit, a transient-state ground electric wave measurement unit, a microprocessor and a field data server, the ultrasonic measurement unit, the transient-state ground electric wave measurement unit and the field data server are connected with the microprocessor, the monitoring center module comprises a database server and a WEB server, the database server is connected with the WEB server, the database server is in communication connection with the field data server, and the WEB server is in communication connection with the plurality of remote terminals. The detection is put in the office through ultrasonic wave and transient state ground electric wave principle realization cubical switchboard, because measuring unit places inside the cubical switchboard, and the sensor receives external disturbance little moreover, abnormal conditions in the reaction cabinet that can be true, secondly realizes monitoring display, analysis early warning and the unified management of equipment, makes things convenient for the staff in time to discover and handle the problem. However, the number of switch cabinets is large and the number of switch cabinets is large, and the cost is high if the device is provided for each switch cabinet, so that the cost needs to be reduced.
Disclosure of Invention
In view of the above, the invention provides a partial discharge monitoring system for a high-voltage switch cabinet, which can complete detection of all switch cabinets by only arranging one set of sensors in an equipment room, thereby greatly reducing the cost.
In order to solve the problems, the invention provides a partial discharge monitoring system of a high-voltage switch cabinet, which comprises a device room, a switch cabinet arranged in the device room, an X-axis moving mechanism arranged at the upper part of the device room, a Y-axis moving mechanism arranged on the X-axis moving mechanism and a monitoring mechanism arranged at the lower end of the Y-axis moving mechanism, wherein the monitoring mechanism comprises a telescopic rod vertically arranged downwards at the lower end of the Y-axis moving mechanism, a U-shaped mounting frame is horizontally arranged at the lower end of the telescopic rod, ultrasonic sensors are arranged at three different positions on the mounting frame, and the ultrasonic sensors are sequentially connected with a control center through a control mechanism and a communication mechanism.
Further, the communication mechanism adopts a 2.4g wireless module, the control mechanism comprises a microcontroller, the control center comprises an industrial personal computer, and the telescopic rod adopts an electric telescopic rod.
Further, three of the ultrasonic sensors cannot be arranged on a straight line.
Further, three ultrasonic sensors are respectively arranged at two ends of the mounting frame and at the connection position of the mounting frame and the lower end of the telescopic rod, and the three ultrasonic sensors are positioned in the same horizontal plane.
Further, the X-axis moving mechanism comprises first guide rods arranged at the upper ends of two sides of the equipment room, the first guide rods are parallel to each other and are horizontally arranged, first sliding blocks are arranged on the first guide rods, second guide rods are arranged between the first sliding blocks, driving blocks are arranged on the lower surfaces of the middle of the second guide rods, first translation screw rods are arranged on the upper portions of the equipment room corresponding to the driving blocks, and first translation motors in transmission connection with one ends of the first translation screw rods are arranged in the equipment room.
Further, the Y-axis moving mechanism comprises a second guide rod and a second translation screw rod which is matched with the second guide rod and is arranged between the two first sliding blocks, the second translation screw rod is provided with a second sliding block, the side face of the second sliding block corresponds to the U-shaped guide plate with a downward opening arranged on the second guide rod, the lower surface of the second sliding block is provided with the telescopic rod, and the first sliding block is provided with a second translation motor which is in transmission connection with the second translation screw rod.
Further, the telescopic rod, the first translation motor and the second translation motor are in signal connection with the control center.
Further, a third guide rod is vertically arranged on the lower surface of the second sliding block downwards, and a guide block matched with the third guide rod is arranged on the side face of the mounting frame.
A partial discharge monitoring method of a high-voltage switch cabinet comprises the following steps:
s1, modeling is performed in advance on an industrial personal computer of a control center, and the positions of all switch cabinets are input;
s2, the control center controls the first translation motor to rotate, so that the X-axis translation mechanism acts to drive the Y-axis translation mechanism to integrally translate, and the translation is stopped when the translation is to the position of the first row of switch cabinets;
s3, the second translation motor works, so that the monitoring mechanism moves to the position right above the switch cabinet to be tested;
s4, starting the telescopic rod to enable the mounting frame to slowly fall, wherein the three ultrasonic sensors are used for monitoring the discharge quantity of the discharge point, after partial discharge occurs, calculating the discharge distance according to a discharge quantity-discharge distance formula, calculating the distance r1 between the discharge point and the three ultrasonic sensors, and then bringing the positions of the three ultrasonic sensors into the positions a1 and a2 of the discharge point;
s5, continuously moving the mounting frame downwards, continuously sending three ultrasonic sensor monitoring signals to the control center, and calculating the positions b1 and b2 of the discharge points through calculation, wherein one of the positions a1 and a2 is equal to one of the positions b1 and b2, and the equal value is the position of the discharge point;
s6, after the monitoring of the first switch cabinet is finished, the mounting frame is lifted, the second switch cabinet of the first row is monitored, and after the monitoring of the mounting cabinet of the first row is finished, the monitoring mechanism returns to the original position, and the X-axis translation mechanism acts to drive the Y-axis translation mechanism to integrally translate to the second row of switch cabinets;
s7, after all the switch cabinets are monitored, returning all the equipment to the original position, and displaying the monitored partial discharge position in a modeling diagram by the control center;
s8, the modeling diagram is a plan view of the equipment room, the positions of the switch cabinets are displayed, the discharge points are marked through red points in the modeling diagram, and the height data are marked beside the red points.
Further, the discharge types of the partial discharge include a tip-tip discharge, a ball-end discharge, and a tip-ball-end discharge.
The invention provides a partial discharge monitoring system of a high-voltage switch cabinet, which comprises a device room, a switch cabinet arranged in the device room, an X-axis moving mechanism arranged at the upper part of the device room, a Y-axis moving mechanism arranged on the X-axis moving mechanism and a monitoring mechanism arranged at the lower end of the Y-axis moving mechanism, wherein the monitoring mechanism comprises a telescopic rod vertically arranged downwards at the lower end of the Y-axis moving mechanism, a U-shaped mounting frame is horizontally arranged at the lower end of the telescopic rod, ultrasonic sensors are arranged at three different positions on the mounting frame, and the ultrasonic sensors are sequentially connected with a control center through a control mechanism and a communication mechanism in a signal manner. The switch cabinets are arranged in the equipment room, and the X-axis moving mechanism and the Y-axis moving mechanism drive the monitoring mechanism to move to the upper part of the switch cabinets and then detect the switch cabinets. The monitoring mechanism is lifted through the control of the telescopic rod, the mounting frame at the lower end of the monitoring mechanism is used for setting the ultrasonic sensor, the ultrasonic sensor can receive the discharge capacity of partial discharge, the numerical value of each distance between the three ultrasonic sensors and a discharge point can be obtained through a discharge capacity-discharge distance formula, two positions can be obtained, the mounting frame is moved to test again, two positions are obtained again, the numerical value measured twice is equal, namely the numerical value of the correct position is equal, and the specific position of the discharge point can be obtained. The control mechanism and the communication mechanism are arranged on the mounting frame and are connected with the ultrasonic sensor in a line, and the control mechanism and the communication mechanism are not shown in the figure and belong to the prior art.
The communication mechanism adopts a 2.4g wireless module, the control mechanism comprises a microcontroller, the control center comprises an industrial personal computer, and the telescopic rod adopts an electric telescopic rod. The wireless module can adopt JF24D, the communication distance reaches 100 meters, the microcontroller can adopt a singlechip, an amplifying circuit, a modulating circuit and the like, and the research on the discharge capacity signals received by the ultrasonic sensor belongs to the conventional technology, so that the specific structure and the principle of the control mechanism are disclosed at present, however, the description is not needed, and the control center gathers data and finally calculates the position of a discharge point. The telescopic link adopts electric telescopic link, and specific model is confirmed according to Y axle translation mechanism's height and the height of cubical switchboard, satisfies the detection demand can.
The three ultrasonic sensors cannot be arranged on a straight line, and if arranged on a straight line, discharge points cannot be measured, but a myriad of points are measured, and the points form a circle.
The three ultrasonic sensors are respectively arranged at the two ends of the mounting frame and at the connecting positions of the mounting frame and the lower end of the telescopic rod, and the three ultrasonic sensors are positioned in the same horizontal plane. The connecting position of the telescopic rod and the mounting frame is positioned at the center of the mounting frame, the ultrasonic sensor is arranged symmetrically, and the ultrasonic sensor is more concise when a program inputs a calculation method.
The X-axis moving mechanism comprises first guide rods arranged at the upper ends of two sides of the equipment room, the first guide rods are parallel to each other and are horizontally arranged, first sliding blocks are arranged on the first guide rods, second guide rods are arranged between the first sliding blocks, driving blocks are arranged on the lower surfaces in the middle of the second guide rods, first translation screw rods are arranged on the upper parts of the equipment room corresponding to the driving blocks, and a first translation motor in transmission connection with one end of each first translation screw rod is arranged in the equipment room. The first translation motor is arranged on the upper portion of the equipment room, and drives the first translation screw rod to rotate, and the driving block can drive the second guide rod to translate due to the fact that the driving block is matched with the screw rod in an internal thread mode, so that translation of the Y-axis moving mechanism is achieved. The first guide bar plays a role in installing the Y-axis moving mechanism and guiding.
The Y-axis moving mechanism comprises a second guide rod and a second translation screw rod which is matched with the second guide rod and is arranged between the two first sliding blocks, the second sliding block is arranged on the second translation screw rod, the side face of the second sliding block corresponds to the U-shaped guide plate with a downward opening arranged on the second guide rod, the telescopic rod is arranged on the lower surface of the second sliding block, and a second translation motor which is in transmission connection with the second translation screw rod is arranged on the first sliding block. The second translation motor is arranged on the first sliding block, the first sliding block is provided with a second translation screw rod through a bearing, and the second translation screw rod is matched with the second guide rod to drive the second sliding block to slide. The second guide rod is rectangular, the driving block is arranged at the lower part of the second guide rod, the upper part of the second guide rod limits the second sliding block through the U-shaped guide plate, and the second sliding block cannot rotate, so that the structure of the U-shaped guide plate is approximately U-shaped, but in order to avoid falling off from the second guide rod, clamping blocks are required to be arranged at the lower end inwards, so that the second guide rod is fixed in the lower end, and a reserved space between the two clamping blocks cannot be influenced when passing through the position of the driving block.
The telescopic rod, the first translation motor and the second translation motor are in signal connection with the control center, and are preferably connected through wireless signals, so that excessive field wiring is avoided.
The lower surface of the second sliding block is vertically and downwards provided with a third guide rod, and the side surface of the mounting frame is provided with a guide block matched with the third guide rod. The third guide bar is mainly to the lift of mounting bracket to lead to, avoids three ultrasonic sensor on the mounting bracket not being in same horizontal plane, causes the imprecision of detection.
The invention can detect the discharge position of the switch cabinet, and mainly can finish the detection of all the switch cabinets by only arranging one set of sensors in the equipment room, has low cost investment and is more beneficial to popularization and use.
Drawings
FIG. 1 is a schematic diagram of a partial discharge monitoring system of a high voltage switchgear of the present invention;
FIG. 2 is a cross-sectional view of the Y-axis movement mechanism of the present invention;
fig. 3 is a schematic structural view of the monitoring mechanism of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 3 of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which are obtained by a person skilled in the art based on the described embodiments of the invention, fall within the scope of protection of the invention.
First embodiment provides a high tension switchgear partial discharge monitoring system, including equipment room 2, arrange the cubical switchboard 15 that sets up in equipment room 2, set up the X axle moving mechanism on equipment room 2 upper portion, set up Y axle moving mechanism on X axle moving mechanism and set up the monitoring mechanism at Y axle moving mechanism lower extreme, monitoring mechanism includes the telescopic link 11 that Y axle moving mechanism lower extreme vertically set up downwards, the telescopic link 11 lower extreme level sets up the mounting bracket 16 of U type, set up ultrasonic sensor 14 in three different positions on the mounting bracket 16, ultrasonic sensor 14 loops through control mechanism, communication mechanism and control center signal connection.
The communication mechanism adopts a 2.4g wireless module, the control mechanism comprises a microcontroller, the control center comprises an industrial personal computer, and the telescopic rod 11 adopts an electric telescopic rod.
Three of the ultrasonic sensors 14 cannot be arranged on a straight line.
The three ultrasonic sensors 14 are respectively arranged at two ends of the mounting frame 16 and at the connection position of the mounting frame 16 and the lower end of the telescopic rod 11, and the three ultrasonic sensors 14 are positioned in the same horizontal plane.
Embodiment two differs from embodiment one in that:
the X-axis moving mechanism comprises first guide rods 3 arranged at the upper ends of two sides of an equipment room 2, the first guide rods 3 are mutually parallel and horizontally arranged, first sliding blocks 4 are arranged on the first guide rods 3, second guide rods 7 are arranged between the first sliding blocks 4, a driving block 10 is arranged on the lower surface in the middle of each second guide rod 7, a first translation screw 1 is arranged on the upper portion of the equipment room 2 corresponding to the driving block 10, and a first translation motor 8 in transmission connection with one end of the first translation screw 1 is arranged in the equipment room 2.
The Y-axis moving mechanism comprises a second guide rod 7 and a second translation screw rod 5 which is matched with the second guide rod 7 and is arranged between the two first sliding blocks 4, a second sliding block 6 is arranged on the second translation screw rod 5, a U-shaped guide plate 13 with a downward opening is arranged on the side face of the second sliding block 6 corresponding to the second guide rod 7, a telescopic rod 11 is arranged on the lower surface of the second sliding block 6, and a second translation motor 9 which is in transmission connection with the second translation screw rod 5 is arranged on the first sliding block 4.
The telescopic rod 11, the first translation motor 8 and the second translation motor 9 are in signal connection with the control center.
The lower surface of the second sliding block 6 is vertically and downwardly provided with a third guide rod 12, and the side surface of the mounting frame 16 is provided with a guide block 17 matched with the third guide rod 12.
An embodiment III, the embodiment provides a method for monitoring partial discharge of a high-voltage switch cabinet, which comprises the following steps:
s1, modeling is performed in advance on an industrial personal computer of a control center, and the positions of all switch cabinets are input;
s2, the control center controls the first translation motor to rotate, so that the X-axis translation mechanism acts to drive the Y-axis translation mechanism to integrally translate, and the translation is stopped when the translation is to the position of the first row of switch cabinets;
s3, the second translation motor works, so that the monitoring mechanism moves to the position right above the switch cabinet to be tested;
s4, starting the telescopic rod to enable the mounting frame to slowly fall, wherein the three ultrasonic sensors are used for monitoring the discharge quantity of the discharge point, after partial discharge occurs, calculating the discharge distance according to a discharge quantity-discharge distance formula, calculating the distance r1 between the discharge point and the three ultrasonic sensors, and then bringing the positions of the three ultrasonic sensors into the positions a1 and a2 of the discharge point;
s5, continuously moving the mounting frame downwards, continuously sending three ultrasonic sensor monitoring signals to the control center, and calculating the positions b1 and b2 of the discharge points through calculation, wherein one of the positions a1 and a2 is equal to one of the positions b1 and b2, and the equal value is the position of the discharge point;
s6, after the monitoring of the first switch cabinet is finished, the mounting frame is lifted, the second switch cabinet of the first row is monitored, and after the monitoring of the mounting cabinet of the first row is finished, the monitoring mechanism returns to the original position, and the X-axis translation mechanism acts to drive the Y-axis translation mechanism to integrally translate to the second row of switch cabinets;
s7, after all the switch cabinets are monitored, returning all the equipment to the original position, and displaying the monitored partial discharge position in a modeling diagram by the control center;
s8, the modeling diagram is a plan view of the equipment room, the positions of the switch cabinets are displayed, the discharge points are marked through red points in the modeling diagram, and the height data are marked beside the red points.
The discharge types of partial discharge include a tip-tip discharge, a bulb-bulb discharge, and a tip-bulb discharge.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (4)
1. A high tension switchgear partial discharge monitoring system, its characterized in that: the device comprises a device room, a switch cabinet arranged in the device room, an X-axis moving mechanism arranged at the upper part of the device room, a Y-axis moving mechanism arranged on the X-axis moving mechanism and a monitoring mechanism arranged at the lower end of the Y-axis moving mechanism, wherein the monitoring mechanism comprises a telescopic rod vertically arranged downwards at the lower end of the Y-axis moving mechanism, a U-shaped mounting frame is horizontally arranged at the lower end of the telescopic rod, ultrasonic sensors are arranged at three different positions on the mounting frame, and the ultrasonic sensors are sequentially connected with a control center through a control mechanism and a communication mechanism;
the X-axis moving mechanism comprises first guide rods which are arranged at the upper ends of two sides of the equipment room, wherein the first guide rods are parallel to each other and are horizontally arranged, first sliding blocks are arranged on the first guide rods, a second guide rod is arranged between the two first sliding blocks, a driving block is arranged on the lower surface in the middle of the second guide rod, a first translation screw rod is arranged at the upper part of the equipment room corresponding to the driving block, and a first translation motor in transmission connection with one end of the first translation screw rod is arranged in the equipment room;
the Y-axis moving mechanism comprises a second guide rod and a second translation screw rod which is matched with the second guide rod and is arranged between the two first sliding blocks, the second sliding block is arranged on the second translation screw rod, a U-shaped guide plate with a downward opening is arranged on the side face of the second sliding block corresponding to the second guide rod, the telescopic rod is arranged on the lower surface of the second sliding block, and a second translation motor which is in transmission connection with the second translation screw rod is arranged on the first sliding block;
a third guide rod is vertically arranged on the lower surface of the second sliding block downwards, and a guide block matched with the third guide rod is arranged on the side surface of the mounting frame;
the method for monitoring the partial discharge of the high-voltage switch cabinet comprises the following steps:
s1, modeling is performed in advance on an industrial personal computer of a control center, and the positions of all switch cabinets are input;
s2, the control center controls the first translation motor to rotate, so that the X-axis translation mechanism acts to drive the Y-axis translation mechanism to integrally translate, and the translation is stopped when the translation is to the position of the first row of switch cabinets;
s3, the second translation motor works, so that the monitoring mechanism moves to the position right above the switch cabinet to be tested;
s4, starting the telescopic rod to enable the mounting frame to slowly fall, wherein the three ultrasonic sensors are used for monitoring the discharge quantity of the discharge point, after partial discharge occurs, calculating the discharge distance according to a discharge quantity-discharge distance formula, calculating the distance r1 between the discharge point and the three ultrasonic sensors, and then bringing the positions of the three ultrasonic sensors into the positions a1 and a2 of the discharge point;
s5, continuously moving the mounting frame downwards, continuously sending three ultrasonic sensor monitoring signals to the control center, and calculating the positions b1 and b2 of the discharge points through calculation, wherein one of the positions a1 and a2 is equal to one of the positions b1 and b2, and the equal value is the position of the discharge point;
s6, after the monitoring of the first switch cabinet is finished, the mounting frame is lifted, the second switch cabinet of the first row is monitored, and after the monitoring of the mounting cabinet of the first row is finished, the monitoring mechanism returns to the original position, and the X-axis translation mechanism acts to drive the Y-axis translation mechanism to integrally translate to the second row of switch cabinets;
s7, after all the switch cabinets are monitored, returning all the equipment to the original position, and displaying the monitored partial discharge position in a modeling diagram by the control center;
s8, the modeling diagram is a plan view of the equipment room, the positions of the switch cabinets are displayed, the discharge points are marked through red points in the modeling diagram, and the height data are marked beside the red points.
2. The high voltage switchgear partial discharge monitoring system of claim 1, wherein: the communication mechanism adopts a 2.4g wireless module, the control mechanism comprises a microcontroller, the control center comprises an industrial personal computer, and the telescopic rod adopts an electric telescopic rod.
3. The high voltage switchgear partial discharge monitoring system of claim 1, wherein: three of the ultrasonic sensors cannot be arranged on a straight line.
4. The high voltage switchgear partial discharge monitoring system of claim 1, wherein: the telescopic rod, the first translation motor and the second translation motor are in signal connection with the control center.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811279768.1A CN109212394B (en) | 2018-10-30 | 2018-10-30 | Partial discharge monitoring system of high-voltage switch cabinet |
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| CN201811279768.1A CN109212394B (en) | 2018-10-30 | 2018-10-30 | Partial discharge monitoring system of high-voltage switch cabinet |
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| CN109212394B true CN109212394B (en) | 2023-12-19 |
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| CN113311296A (en) * | 2021-03-11 | 2021-08-27 | 国网江苏省电力有限公司南通供电分公司 | Combination switch cabinet partial discharge detection system based on ultrasonic detection |
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