CN215894738U - High tension switchgear PT cabinet operation monitoring devices - Google Patents
High tension switchgear PT cabinet operation monitoring devices Download PDFInfo
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- CN215894738U CN215894738U CN202121868931.5U CN202121868931U CN215894738U CN 215894738 U CN215894738 U CN 215894738U CN 202121868931 U CN202121868931 U CN 202121868931U CN 215894738 U CN215894738 U CN 215894738U
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- 239000003990 capacitor Substances 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 230000005350 ferromagnetic resonance Effects 0.000 description 1
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- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000009421 internal insulation Methods 0.000 description 1
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Abstract
The utility model discloses an operation monitoring device of a high-voltage switch PT cabinet, which comprises a PT neutral point current detection unit, an overvoltage monitoring unit, an ultrasonic partial discharge monitoring unit and a control unit, wherein the output ends of the PT neutral point current detection unit, the overvoltage monitoring unit and the ultrasonic partial discharge monitoring unit are respectively connected with the control unit; the control unit comprises a microprocessor, a man-machine module, a communication module and a power supply module, wherein the output ends of the PT neutral point current detection unit, the overvoltage monitoring unit and the ultrasonic partial discharge monitoring unit are respectively connected with the input end of the microprocessor, the microprocessor is respectively connected with the man-machine module and the communication module, and the output end of the power supply module is respectively connected with the microprocessor, the man-machine module and the communication module. The utility model can solve the problems of frequent overvoltage faults, difficult harmonic elimination and difficult internal fault monitoring of the high-voltage PT cabinet, can efficiently, accurately and comprehensively monitor the running state of the PT cabinet, and can be used for intelligently eliminating specific running defects.
Description
Technical Field
The utility model relates to the field of intelligent operation and detection of an electric power system, in particular to an operation monitoring device for a high-voltage switch (PT) cabinet, which can be suitable for automatically monitoring, eliminating and alarming operation risks such as operation overvoltage, partial discharge defects and the like of the high-voltage PT cabinet of a transformer substation.
Background
With the rapid development of national economy, the grid frame scale of the power grid in China is continuously enlarged, and the number of operating substations is increased day by day. In a power grid system, a high-voltage switch cabinet is equipment for realizing connection between a low-voltage side of a transformer substation and a power distribution network, and whether the high-voltage switch cabinet normally operates or not directly relates to reliable supply of power consumption of users. The low-voltage side high-voltage switch PT cabinet can acquire bus voltage signals and can be used for monitoring the running condition of the low-voltage side of the transformer substation, identifying faults in the substation or lines, starting trip protection and the like.
In the operation process of the high-voltage switch PT cabinet, PT faults easily occur or system resonance overvoltage is caused under the influence of factors such as external overvoltage, ferromagnetic resonance, internal insulation local defects and the like, so that the influence is brought to the safety of equipment and the stable operation of a system. At present, a fault recording system is not generally installed on the low-voltage side of a power grid system, and effective means for monitoring, identifying and eliminating overvoltage in real time are not available, and due to the fact that an adopted harmonic eliminator is poor in overvoltage type identification capability and insufficient in sampling precision, the actual harmonic elimination effect is not ideal, the reason is difficult to find out after a fault occurs, and the targeted prevention and improvement are difficult to carry out. Aiming at the defects of the PT body of the switch cabinet, the PT body can only be regularly inspected through live detection, the defect detection effect is not timely, and the detection result has large deviation. In addition, the traditional PT cabinet fault detection method is single, low in judgment accuracy, lack of multi-source parameter linkage comprehensive judgment and analysis capability, or need to be checked through a large amount of later manual intervention, and is slow in response speed and long in power failure time. In summary, in order to improve the fault detection monitoring and automatic harmonic elimination capability of the high-voltage switch PT cabinet, it is urgently needed to research a device and a method for intelligently early warning and inhibiting the operation risk of the high-voltage switch PT cabinet.
SUMMERY OF THE UTILITY MODEL
The technical problems to be solved by the utility model are as follows: aiming at the problems in the prior art and the problem of poor early warning and defect eliminating capability of the operation risk of the high-voltage switch PT cabinet, the utility model provides the operation monitoring device of the high-voltage switch PT cabinet, aiming at solving the problems of frequent overvoltage fault occurrence, difficult harmonic elimination and difficult internal fault monitoring of the high-voltage PT cabinet, being capable of efficiently, accurately and comprehensively monitoring the operation state of the PT cabinet and being capable of realizing intelligent defect elimination of specific operation defects.
In order to solve the technical problems, the utility model adopts the technical scheme that:
the utility model provides a high tension switchgear PT cabinet operation monitoring devices, includes PT neutral point current detection unit, overvoltage monitoring unit, supersound office and puts monitoring unit and control unit, PT neutral point current detection unit, overvoltage monitoring unit, supersound office put monitoring unit's output and link to each other with control unit respectively.
Optionally, the PT neutral point current detection unit is a current transformer TA, the current transformer TA is installed at a tail of a primary resonance elimination module of the high-voltage switch PT cabinet, and collects a neutral point current in a core-through manner and outputs the neutral point current to the control unit.
Optionally, the overvoltage monitoring unit includes a broadband sensing insulator and a secondary voltage dividing circuit, the broadband sensing insulator is arranged in the high-voltage switch PT cabinet, a high-voltage side of the broadband sensing insulator is connected with a leading-out copper bar at the lower end of an isolation handcart of the high-voltage switch PT cabinet, and a low-voltage side outputs a low-voltage signal to the control unit through the secondary voltage dividing circuit.
Optionally, the ultrasonic partial discharge monitoring unit includes an ultrasonic sensing unit and a pre-amplification unit, the ultrasonic sensing unit is installed in the high-voltage switch PT cabinet, and an output end of the ultrasonic sensing unit outputs an ultrasonic sensing signal to the control unit through the pre-amplification unit.
Optionally, the control unit includes a microprocessor, a human-computer module, a communication module and a power module, the output ends of the PT neutral point current detection unit, the overvoltage monitoring unit and the ultrasonic partial discharge monitoring unit are respectively connected to the input end of the microprocessor, the microprocessor is respectively connected to the human-computer module and the communication module, and the output end of the power module is respectively connected to the microprocessor, the human-computer module and the communication module.
Optionally, the control output end of the microprocessor is further connected with the control end of the first harmonic elimination module or the second harmonic elimination module of the high-voltage switch PT cabinet to start the first harmonic elimination module or the second harmonic elimination module of the high-voltage switch PT cabinet to perform harmonic elimination.
Optionally, the human-machine module is a touch screen module.
Optionally, the communication module is a WiFi module, a bluetooth module, or a mobile network communication module.
The utility model provides a high tension switchgear PT cabinet, includes high tension switchgear PT cabinet body and locates the inside monitoring devices of high tension switchgear PT cabinet, monitoring devices is aforementioned high tension switchgear PT cabinet operation monitoring devices.
Optionally, the front side of the high-voltage switch PT cabinet body is provided with an installation cavity, the front side of the installation cavity is provided with a panel with a door lock, the rear part of the installation cavity is provided with a vent hole penetrating through the back plate of the high-voltage switch PT cabinet body, and a heat radiation fan is arranged in the air vent, slots are arranged at two sides of the installation cavity, a plurality of elastic electrodes are arranged at the end parts of the slots of the installation cavity, the control unit is inserted in the slot through a circuit board bottom plate and is respectively connected with a power supply in the high-voltage switch PT cabinet and a PT neutral point current detection unit, an overvoltage monitoring unit and an ultrasonic partial discharge monitoring unit through elastic electrodes, the two sides of the circuit board bottom plate are provided with arc-shaped positioning grooves, each slot is provided with at least one positioning mechanism for realizing the matching positioning with the arc-shaped positioning groove, positioning mechanism includes the mounting groove and inlays the ball of establishing in the mounting groove, be equipped with reset spring between the bottom of ball and mounting groove.
Compared with the prior art, the utility model has the following advantages: the utility model relates to a high-voltage switch PT cabinet operation monitoring device, which comprises a PT neutral point current detection unit, an overvoltage monitoring unit, an ultrasonic partial discharge monitoring unit and a control unit, wherein the output ends of the PT neutral point current detection unit, the overvoltage monitoring unit and the ultrasonic partial discharge monitoring unit are respectively connected with the control unit, so that the PT neutral point current detection unit, the overvoltage monitoring unit and the ultrasonic partial discharge monitoring unit can be used for automatically acquiring, comparing and comprehensively analyzing multidimensional signals of a PT cabinet, can realize the omnibearing monitoring of the operation risk of the high-voltage switch PT cabinet by combining the monitoring of 3 signals of PT neutral point current, overvoltage and ultrasonic partial discharge, can solve the problems of frequent overvoltage fault occurrence, difficult harmonic elimination and difficult internal fault monitoring of the high-voltage switch PT cabinet, can efficiently, accurately and comprehensively monitor the operation state of the high-voltage switch PT cabinet, and can be used for realizing the intelligent defect elimination of specific operation.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of an implementation principle of the positioning mechanism in the embodiment of the present invention.
Illustration of the drawings: 1. a PT neutral point current detection unit; 2. an overvoltage monitoring unit; 21. a broadband sensing insulator; 22. a secondary voltage dividing circuit; 3. an ultrasonic partial discharge monitoring unit; 31. an ultrasonic sensing unit; 32. a pre-amplification unit; 4. a control unit; 40. a circuit board base plate; 401. an arc-shaped positioning groove; 402. a ball bearing; 403. a return spring; 41. a microprocessor; 42. a human-machine module; 43. a communication module; 44. and a power supply module.
Detailed Description
As shown in fig. 1, the operation monitoring device for the high-voltage switch PT cabinet of this embodiment includes a PT neutral point current detecting unit 1, an overvoltage monitoring unit 2, an ultrasonic partial discharge monitoring unit 3, and a control unit 4, where output terminals of the PT neutral point current detecting unit 1, the overvoltage monitoring unit 2, and the ultrasonic partial discharge monitoring unit 3 are respectively connected to the control unit 4. PT neutral point current detection unit 1 can realize the PT neutral point current detection of high tension switchgear PT cabinet, overvoltage monitoring unit 2 can realize the overvoltage monitoring of high tension switchgear PT cabinet, the monitoring is put in the supersound office that monitoring unit 3 can realize high tension switchgear PT cabinet, can be used to realize the automatic acquisition to PT cabinet multidimension signal, contrast, integrated analysis, combine PT neutral point current, it is overvoltage, the monitoring of 3 kinds of signals is put in the supersound office, can realize the all-round monitoring of operational risk of high tension switchgear PT cabinet, can solve high tension switchgear PT cabinet overvoltage fault frequently, the harmonic elimination difficulty, the difficult problem of inside fault monitoring, can be high-efficient, accurate, comprehensive monitoring high tension switchgear PT cabinet running state, can be used to realize the intelligence to specific operation defect and disappear.
The PT neutral point current detection unit 1 is used for monitoring the discharge current of the resonance elimination device as PT neutral point current. In this embodiment, the PT neutral point current detection unit 1 is a current transformer TA, the current transformer TA is installed at the tail of the primary resonance elimination module of the high-voltage switch PT cabinet, and the neutral point current is collected and output to the control unit 4 in a core-through manner, so that the requirements of balance characteristics, anti-interference performance and linearity can be met. In the embodiment, the measurement range of the current transformer TA is 50mA-1A, the ratio difference is less than or equal to 0.2%, the phase difference is less than or equal to 30 minutes, the rated output is 0-1V (AC), and the zero sequence current of the PT neutral point can be effectively measured.
The overvoltage monitoring unit 2 can collect the overvoltage signal for overvoltage identification and countermeasure analysis. As shown in fig. 1, the overvoltage monitoring unit 2 of the present embodiment includes a broadband sensing insulator 21 and a secondary voltage dividing circuit 22, the broadband sensing insulator 21 is disposed in the high-voltage switch PT cabinet, a high-voltage side of the broadband sensing insulator 21 is connected to a leading-out copper bar at a lower end of an isolation handcart of the high-voltage switch PT cabinet, and a low-voltage side outputs a low-voltage signal to the control unit 4 through the secondary voltage dividing circuit 22. The broadband sensing insulator 21 is a non-traditional voltage transformer capable of covering measurement and protection ranges, can realize integration of support insulation and broadband overvoltage monitoring functions, adopts a thin film capacitor or a ceramic capacitor, can meet the requirements of reliable operation for 10 years and unchanged measurement precision, and can meet all error requirements of a rated primary voltage measurement level and a protection level, wherein the rated primary voltage comprises a rated phase voltage and a rated zero sequence voltage, and the standard value is a standard value
Rated secondary phase voltage standard value of
And the rated secondary zero sequence voltage standard value is 6.5V/3.
The ultrasonic partial discharge monitoring unit 3 is used for realizing continuous ultrasonic partial discharge monitoring inside the PT cabinet, and a monitoring result can be used for judging whether partial discharge signals caused by abnormal insulation defects exist inside the PT cabinet. As shown in fig. 1, the ultrasonic partial discharge monitoring unit 3 of this embodiment includes an ultrasonic sensing unit 31 and a pre-amplification unit 32, the ultrasonic sensing unit 31 is installed in a high-voltage switch PT cabinet, and an output end of the ultrasonic sensing unit 31 outputs an ultrasonic sensing signal to the control unit 4 through the pre-amplification unit 32. In this embodiment, the ultrasonic sensing unit 31 employs an industrial-grade high-precision ultrasonic probe, and is matched with a high-efficiency amplification filter circuit, so that the sensitivity is high, the response is rapid, the vibration frequency band of the operating device can be avoided, and the partial discharge ultrasonic signals including the partial discharge pulse frequency and the pulse amplitude are effectively collected. Through the research on the relation among the time domain phase, the pulse number and the measurement threshold under different defect models, various anti-interference algorithms are combined, field interference signals are eliminated, the insulation fault condition of the PT cabinet is early warned, and data can be uploaded to an upper computer in a 485 bus mode.
As shown in fig. 1, the control unit 4 of this embodiment includes a microprocessor 41, a human-machine module 42, a communication module 43, and a power supply module 44, where output ends of the PT neutral point current detection unit 1, the overvoltage monitoring unit 2, and the ultrasonic partial discharge monitoring unit 3 are respectively connected to an input end of the microprocessor 41, the microprocessor 41 is respectively connected to the human-machine module 42 and the communication module 43, and an output end of the power supply module 44 is respectively connected to the microprocessor 41, the human-machine module 42, and the communication module 43.
As shown in fig. 1, the control output terminal of the microprocessor 41 of this embodiment is further connected to the control terminal of the first harmonic elimination module or the second harmonic elimination module of the high-voltage switch PT cabinet to start the first harmonic elimination module or the second harmonic elimination module (not shown) of the high-voltage switch PT cabinet to perform harmonic elimination, so that active harmonic elimination can be performed according to the monitoring result.
In this embodiment, the microprocessor 41 is implemented by a single chip microcomputer.
In this embodiment, the human-machine module 42 is a touch screen module.
In this embodiment, the communication module 43 is a WiFi module, and in addition, a bluetooth module or a mobile network communication module may also be used.
In addition, this embodiment still provides a high tension switchgear PT cabinet, include the high tension switchgear PT cabinet body and locate the inside monitoring devices of high tension switchgear PT cabinet, monitoring devices is aforementioned high tension switchgear PT cabinet operation monitoring devices.
In this embodiment, a mounting cavity is disposed on the front side of the high-voltage switch PT cabinet body, a panel with a door lock is disposed on the front side of the mounting cavity, a vent hole penetrating through the back plate of the high-voltage switch PT cabinet body is disposed on the rear portion of the mounting cavity, a cooling fan is installed in the vent hole, slots are disposed on both sides of the mounting cavity, a plurality of elastic electrodes are disposed at the end portions of the mounting cavity located in the slots, a control unit 4 is inserted in the slots through a circuit board bottom plate 40 and is respectively connected with a power supply in the high-voltage switch PT cabinet and a PT neutral point current detection unit 1, an overvoltage monitoring unit 2, and an ultrasonic partial discharge monitoring unit 3 through the elastic electrodes, arc-shaped positioning slots 401 are disposed on both sides of the circuit board bottom plate 40, at least one positioning mechanism for positioning in cooperation with the arc-shaped positioning slots 401 is disposed in each slot, the positioning mechanism includes a mounting groove and a ball 402 embedded in the mounting groove, a return spring 403 is disposed between the ball 402 and the bottom of the mounting groove, as shown in fig. 2. After the ball 402 enters the arc-shaped positioning groove 401, a thrust force towards the direction of the circle center of the arc-shaped positioning groove 401 is formed by the thrust force of the return spring 403, so that the circuit board bottom plate 40 and the arc-shaped positioning groove 401 are matched in place, and the circuit connection stability of the circuit board bottom plate 40, which is respectively connected with a power supply in a high-voltage switch PT cabinet and a PT neutral point current detection unit 1, an overvoltage monitoring unit 2 and an ultrasonic partial discharge monitoring unit 3 through elastic electrodes, can be realized.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the utility model may occur to those skilled in the art without departing from the principle of the utility model, and are considered to be within the scope of the utility model.
Claims (10)
1. The utility model provides a high tension switchgear PT cabinet operation monitoring devices, its characterized in that, includes PT neutral point current detection unit (1), overvoltage monitoring unit (2), supersound office and puts monitoring unit (3) and control unit (4), PT neutral point current detection unit (1), overvoltage monitoring unit (2), supersound office put the output of monitoring unit (3) and link to each other with control unit (4) respectively.
2. The operation monitoring device of the high-voltage switch PT cabinet according to claim 1, characterized in that the PT neutral point current detecting unit (1) is a current transformer TA, which is installed at the tail of the primary harmonic elimination module of the high-voltage switch PT cabinet and collects the neutral point current in a core-through manner and outputs the neutral point current to the control unit (4).
3. The operation monitoring device of the high-voltage switch PT cabinet according to claim 2, characterized in that the overvoltage monitoring unit (2) comprises a broadband sensing insulator (21) and a secondary voltage dividing circuit (22), the broadband sensing insulator (21) is arranged in the high-voltage switch PT cabinet, the high-voltage side of the broadband sensing insulator (21) is connected with a leading-out copper bar at the lower end of an isolation handcart of the high-voltage switch PT cabinet, and the low-voltage side outputs a low-voltage signal to the control unit (4) through the secondary voltage dividing circuit (22).
4. The operation monitoring device of the high-voltage switch PT cabinet according to claim 3, characterized in that the ultrasonic partial discharge monitoring unit (3) comprises an ultrasonic sensing unit (31) and a pre-amplification unit (32), the ultrasonic sensing unit (31) is installed in the high-voltage switch PT cabinet, and the output end of the ultrasonic sensing unit (31) outputs an ultrasonic sensing signal to the control unit (4) through the pre-amplification unit (32).
5. The operation monitoring device of the high-voltage switch PT cabinet according to claim 4, characterized in that the control unit (4) comprises a microprocessor (41), a man-machine module (42), a communication module (43) and a power module (44), the output ends of the PT neutral point current detection unit (1), the overvoltage monitoring unit (2) and the ultrasonic partial discharge monitoring unit (3) are respectively connected with the input end of the microprocessor (41), the microprocessor (41) is respectively connected with the man-machine module (42) and the communication module (43), and the output end of the power module (44) is respectively connected with the microprocessor (41), the man-machine module (42) and the communication module (43).
6. The device for monitoring the operation of the high-voltage switch PT cabinet according to claim 5, characterized in that the control output terminal of the microprocessor (41) is further connected with the control terminal of the primary resonance elimination module or the secondary resonance elimination module of the high-voltage switch PT cabinet to start the primary resonance elimination module or the secondary resonance elimination module of the high-voltage switch PT cabinet to perform resonance elimination.
7. The high-voltage switch PT cabinet operation monitoring device of claim 5, characterized in that the human machine module (42) is a touch screen module.
8. The operation monitoring device of the high-voltage switch PT cabinet of claim 5, characterized in that the communication module (43) is a WiFi module, a Bluetooth module or a mobile network communication module.
9. A high-voltage switch PT cabinet, comprising a high-voltage switch PT cabinet body and a monitoring device arranged inside the high-voltage switch PT cabinet, characterized in that the monitoring device is the high-voltage switch PT cabinet operation monitoring device of any one of claims 1 to 8.
10. The high-voltage switch PT cabinet according to claim 9, characterized in that the front side of the high-voltage switch PT cabinet body is provided with a mounting cavity, the front side of the mounting cavity is provided with a panel with a door lock, the rear part of the mounting cavity is provided with a vent hole penetrating through the back plate of the high-voltage switch PT cabinet body, the vent hole is provided with a cooling fan, slots are arranged on two sides of the mounting cavity, the end part of the mounting cavity, which is located at the slot, is provided with a plurality of elastic electrodes, the control unit (4) is inserted into the slots through a circuit board bottom plate (40) and is respectively connected with a power supply in the high-voltage switch PT cabinet, a PT neutral point current detection unit (1), an overvoltage monitoring unit (2) and an ultrasonic partial discharge monitoring unit (3) through the elastic electrodes, arc-shaped positioning grooves (401) are arranged on two sides of the circuit board bottom plate (40), and at least one positioning mechanism for realizing the matching positioning with the arc-shaped positioning grooves (401) is arranged in each slot, the positioning mechanism comprises a mounting groove and a ball (402) embedded in the mounting groove, and a return spring (403) is arranged between the ball (402) and the bottom of the mounting groove.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121868931.5U CN215894738U (en) | 2021-08-10 | 2021-08-10 | High tension switchgear PT cabinet operation monitoring devices |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121868931.5U CN215894738U (en) | 2021-08-10 | 2021-08-10 | High tension switchgear PT cabinet operation monitoring devices |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115453288A (en) * | 2022-09-15 | 2022-12-09 | 惟精环境科技有限公司 | High tension switchgear partial discharge monitoring system |
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- 2021-08-10 CN CN202121868931.5U patent/CN215894738U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115453288A (en) * | 2022-09-15 | 2022-12-09 | 惟精环境科技有限公司 | High tension switchgear partial discharge monitoring system |
| CN115453288B (en) * | 2022-09-15 | 2024-03-08 | 惟精环境科技有限公司 | Partial discharge monitoring system of high-voltage switch cabinet |
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