CN218767175U - Ring main unit partial discharge monitoring system - Google Patents
Ring main unit partial discharge monitoring system Download PDFInfo
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- CN218767175U CN218767175U CN202221500022.0U CN202221500022U CN218767175U CN 218767175 U CN218767175 U CN 218767175U CN 202221500022 U CN202221500022 U CN 202221500022U CN 218767175 U CN218767175 U CN 218767175U
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Abstract
The utility model discloses a looped netowrk cabinet partial discharge monitoring system relates to electric power monitoring technology field. The system comprises a local discharge signal acquisition module arranged inside a ring main unit, a first anti-interference shielding box and a second anti-interference shielding box which are arranged outside the ring main unit, wherein a plurality of signal conditioning circuits are arranged in the first anti-interference shielding box, a multichannel ring main unit partial discharge monitoring device is arranged in the second anti-interference shielding box, the local discharge signal acquisition module is connected into two corresponding signal conditioning circuits in the first anti-interference shielding box through two signal lines, the two corresponding signal conditioning circuits are connected into two signal input ports of the multichannel ring main unit partial discharge monitoring device, and the multichannel ring main unit partial discharge monitoring device is connected with an upper computer through a communication interface. The utility model discloses but the inside partial discharge signal of real-time supervision looped netowrk cabinet shows each monitoring point partial discharge amplitude, frequency, in time discovers the insulation defect of looped netowrk cabinet, and the interference killing feature is strong, and monitoring data is accurate.
Description
Technical Field
The utility model relates to an electric power monitoring technology field, concretely relates to looped netowrk cabinet partial discharge monitoring system.
Background
The ring main unit is an important power device in a distribution network system, and the operation reliability of the ring main unit is related to the safety and stability of the whole power grid and the reliability of urban power supply. If insulation faults such as bubble gaps, impurities, spikes and the like exist in the inner insulation part of the ring main unit, the electric field distribution of the defect part is uneven, the electric field intensity is increased, and the charge directionally moves, so that the part generates discharge which does not penetrate through the whole insulation, namely partial discharge. Partial discharge is a sign of aging of electrical and mechanical components and is a significant cause of the eventual dielectric breakdown of high-voltage electrical equipment. Each time of discharge, impact of high-energy electrons or accelerated electrons, especially long-term partial discharge, can cause various physical effects and chemical reactions, for example, when charged particles impact the outer wall of a bubble, insulated chemical bonds can be broken to crack, insulated molecular structures are damaged, insulation degradation is caused, the insulation damage process is accelerated, and the service life of electrical equipment is influenced.
Under long-term work in high voltage environment, looped netowrk cabinet insulating material is degradation gradually under the electric field effect, and energy loss still can puncture under the strong electric field effect, and the local discharge has caused the destruction to the insulation of equipment in the cabinet, can seriously influence the normal operating of looped netowrk cabinet. The insulation fault is represented by external insulation flashover to the ground, internal insulation flashover to the ground, interphase insulation flashover, lightning overvoltage flashover, porcelain insulator sleeve, capacitor sleeve flashover, pollution flashover, breakdown, explosion, lifting rod flashover, CT flashover, breakdown, explosion, porcelain insulator fracture and the like. The main reason causing the equipment failure of the ring main unit is the deterioration of the insulating property, when the deterioration of the insulating property does not penetrate through the insulating medium, the defect is difficult to find by the conventional preventive detection means, and at the moment, partial discharge is often generated in the insulating medium of the equipment. The current ring main unit partial discharge detection is generally realized by adopting a periodic test method, the abnormal condition of partial discharge cannot be detected in time, and the evolution trend of partial discharge is difficult to find, so that the best opportunity of equipment maintenance is missed. In addition, periodic testing is performed entirely by the tester, which also increases the labor cost of the test. Moreover, for the partial discharge test of the ring main unit with the voltage level of more than 10kV and the internal high-voltage equipment thereof, the safety protection of personnel is required to be made in the test process, the test is long in time consumption, and the efficiency is low.
SUMMERY OF THE UTILITY MODEL
In order to solve the defect that above-mentioned technique exists, the utility model provides a looped netowrk cabinet partial discharge monitoring system.
The utility model discloses realize that the technical scheme that above-mentioned technological effect adopted is:
the utility model provides a looped netowrk cabinet partial discharge monitoring system, is including setting up at the inside partial discharge signal collection module of looped netowrk cabinet, establishing the anti-interference shielding box is resisted to the outside first anti-interference shielding box of looped netowrk cabinet and second, be equipped with multichannel signal conditioning circuit in the first anti-interference shielding box, be equipped with multichannel looped netowrk cabinet partial discharge monitoring devices in the anti-interference shielding box of second, partial discharge signal collection module inserts through two way signal lines two way signal conditioning circuit of correspondence in the first anti-interference shielding box, two way signal conditioning circuit that should correspond insert two way signal input ports of monitoring devices are put in multichannel looped netowrk cabinet partial discharge, multichannel looped netowrk cabinet partial discharge monitoring devices's signal output port passes through communication interface and host computer connection.
Preferably, in the above-mentioned ring main unit partial discharge monitoring system, the multichannel ring main unit partial discharge monitoring device is a 16-channel ring main unit partial discharge monitoring device, and 16 signal input ports thereof are respectively connected to one-to-one signal conditioning circuit, the signal conditioning circuit is a corresponding 16 signal conditioning circuit, the number of the partial discharge signal acquisition modules is 8, and each partial discharge signal acquisition module is respectively connected to two corresponding signal input ports of the 16-channel ring main unit partial discharge monitoring device through two signal conditioning circuits.
Preferably, in the above ring main unit partial discharge monitoring system, the 16-channel ring main unit partial discharge monitoring device is a 16-channel ring main unit partial discharge monitoring device with a model number of QYAE-SCC-PV.
Preferably, in the above ring main unit partial discharge monitoring system, the partial discharge signal acquisition module is an AE/TEV two-in-one sensor.
Preferably, in the above partial discharge monitoring system for the ring main unit, the AE/TEV two-in-one sensor is an AE/TEV two-in-one sensor of type QYAE-CTU 01.
Preferably, in the above-mentioned ring main unit partial discharge monitoring system, the backplate of the AE/TEV two-in-one sensor is a magnetic backplate, and is fixed on the inner wall of the ring main unit through magnetic attraction.
Preferably, in the above ring main unit partial discharge monitoring system, screw holes are provided at four corners of a back plate of the AE/TEV two-in-one sensor, and the screw holes are fixed on an inner wall of the ring main unit by screws.
Preferably, in the above-mentioned ring main unit partial discharge monitoring system, a first cable chamber capable of shielding electromagnetic interference is provided between the first anti-interference shielding box and the ring main unit, and a second cable chamber capable of shielding electromagnetic interference is provided between the first anti-interference shielding box and the second anti-interference shielding box.
The utility model has the advantages that: the utility model discloses a but the inside partial discharge signal of real-time supervision looped netowrk cabinet of looped netowrk cabinet partial discharge monitoring system shows each monitoring point partial discharge amplitude, frequency, and the signal interference killing feature is strong, can in time discover the insulation defect of looped netowrk cabinet, and monitoring data is accurate, can provide the data of judging for assessing its insulation level and ageing degree, provides data support for the maintenance work of looped netowrk cabinet to ensure the safe and reliable operation of looped netowrk cabinet.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a block diagram of the present invention;
fig. 3 is a three-dimensional structure diagram of a viewing angle of the 16-channel ring main unit partial discharge monitoring device of the present invention;
fig. 4 is a three-dimensional structure diagram of a viewing angle of the 16-channel ring main unit partial discharge monitoring device of the present invention;
fig. 5 is a circuit diagram of the signal conditioning circuit of the present invention;
fig. 6 is a structural diagram of a magnetic attraction fixed AE/TEV two-in-one sensor according to an embodiment of the present invention;
fig. 7 is a structural diagram of a screw fixed AE/TEV two-in-one sensor according to an embodiment of the present invention.
Detailed Description
For a further understanding of the invention, reference is made to the following description taken in conjunction with the accompanying drawings and specific examples, in which:
in the description of the present application, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it should be further noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, a connection through an intermediate medium, and a connection between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to specific circumstances.
Referring to fig. 1 and fig. 2, as shown in the figures, an embodiment of the present invention provides a ring main unit partial discharge monitoring system, which includes a partial discharge signal acquisition module 1 disposed inside the ring main unit 100, a first anti-interference shielding box 2 disposed outside the ring main unit 100, and a second anti-interference shielding box 3. Wherein, the looped netowrk cabinet 100, interference shielding box 3 is all fixed on a support plate 110 to anti interference shielding box 2 and second of first anti interference shielding box 2, be equipped with multichannel signal conditioning circuit in this first anti interference shielding box 2, be equipped with multichannel looped netowrk cabinet partial discharge monitoring devices in the interference shielding box 3 is resisted to the second, first anti interference shielding box 2 provides interference signal shielding function to multichannel signal conditioning circuit, second is resisted interference shielding box 3 and is provided interference signal shielding function to multichannel looped netowrk cabinet partial discharge monitoring devices, avoid monitoring signal to receive outside electromagnetic signal interference in the process of uploading, prevent signal distortion. Specifically, the partial discharge signal acquisition module 1 is connected to two corresponding signal conditioning circuits in the first anti-interference shielding box 2 through two signal lines, the two corresponding signal conditioning circuits are connected to two signal input ports of the multichannel ring main unit partial discharge monitoring device, a signal output port of the multichannel ring main unit partial discharge monitoring device is connected with an upper computer through a communication interface, and monitoring signals of a terminal can be acquired through the upper computer.
Further, in the preferred embodiment of the utility model, this multichannel looped netowrk cabinet office puts monitoring devices and puts monitoring devices 4 for 16 passageway looped netowrk cabinet offices, and its 16 way signal input port is signal conditioning circuit of the same kind of the one-to-one access respectively. Specifically, the signal conditioning circuit is a 16-channel corresponding signal conditioning circuit, the number of the partial discharge signal acquisition modules 1 is 8, and each partial discharge signal acquisition module 1 is respectively connected to two corresponding signal input ports of the 16-channel ring main unit partial discharge monitoring device 4 through two signal conditioning circuits. As an optimized embodiment of the present invention, the 16-channel ring main unit partial discharge monitoring device 4 adopts a 16-channel ring main unit partial discharge monitoring device with a model of QYAE-SCC-PV. As shown in fig. 3 and fig. 4, the signal input end surface of the 16-channel ring main unit partial discharge monitoring device 4 is provided with 16 signal input ports 40, the interface end surface of the 16-channel ring main unit partial discharge monitoring device 4 is respectively provided with a network port 41, an RS485 communication interface 42, a communication selection dial button 43, a communication indicator lamp 44, an RS232 communication interface 45, a TF card interface 46, an external synchronization interface/dry contact interface 47 and a power input interface 48, and the front surface of the housing of the 16-channel ring main unit partial discharge monitoring device 4 is further provided with a status indicator lamp 49. This 16 passageway looped netowrk cabinet partial discharge monitoring devices 4 adopts embedded high performance treater, when guaranteeing high-speed sampling, has reduced the device consumption by a wide margin. Data are uploaded to an upper computer through a 485 bus/network cable networking, and a multi-core cable integrating power supply and communication is adopted for serial connection, so that field wiring is greatly simplified. The working power supply is DC48V/DC24V, the ripple voltage is not more than 1%, the external dimension is 234X 154X 54mm (length X width X depth), the power consumption of the whole machine is less than 5W, the weight of the whole machine is less than 1.5kg, and the working power supply can adapt to the working environment with-40-85 ℃ and 0-99% of non-condensation.
As shown IN fig. 5, which is a circuit diagram of the signal conditioning circuit, a signal induced and input by the partial discharge signal acquisition module 1 is input through an IN terminal, then is filtered and amplified by the signal conditioning circuit, eliminates an interference signal, amplifies an effective signal, and then is input to the 16-channel ring main unit partial discharge monitoring device 4 through a signal output terminal OUT.
Further, in the preferred embodiment of the present invention, the partial discharge signal collecting module 1 is an AE/TEV two-in-one sensor, and the AE/TEV two-in-one sensor adopts an AE/TEV two-in-one sensor with a model number of QYAE-CTU 01. The AE/TEV two-in-one sensor is an ultrasonic/transient earth voltage two-in-one integrated sensor, adopts a modular design, and has the size of 80mm x 50mm x 22mm (length x width x height). The AE/TEV two-in-one sensor is arranged inside the ring main unit 100 and can accurately reflect the partial discharge condition in the ring main unit 100.
The parameters of AE (ultrasonic sensor) are as follows:
ultrasonic linearity error: less than or equal to plus or minus 20 percent;
ultrasonic detection band: 20-60 kHz;
center frequency of ultrasonic sensor: 40 +/-1 kHz;
measuring range by ultrasonic wave: 0-60 dBmV;
ultrasonic resolution: 1dBmV;
ultrasonic wave error: 2dBmV;
ultrasonic wave sensitivity: the peak value is more than or equal to 60dB, and the average value is more than or equal to 40dB
The parameters of the TEV (transient voltage ground sensor) are as follows:
transient low voltage wave detection band: 3-100 MHz;
transient low voltage wave measuring range: 0-60 dBmV;
transient low voltage wave pulse count error: less than or equal to +/-10 percent.
Further, in the embodiment of the present invention, as shown in fig. 1, a first cable chamber 5 capable of shielding electromagnetic interference is provided between the first anti-interference shielding box 2 and the ring main unit 100, and a second cable chamber 6 capable of shielding electromagnetic interference is provided between the first anti-interference shielding box 2 and the second anti-interference shielding box 3. The cable connected between the local discharge signal acquisition module 1 and the signal conditioning circuit in the first anti-interference shielding box 2 is routed through the first cable chamber 5, and the cable connected between the signal conditioning circuit in the first anti-interference shielding box 2 and the multichannel ring main unit local discharge monitoring device in the second anti-interference shielding box is routed through the second cable chamber 6. As an embodiment of the present invention, the first cable chamber 5, the second cable chamber 6, the first anti-interference shielding box 2 and the second anti-interference shielding box 3 are made of permalloy 80, so as to effectively shield the interference of external electromagnetic signals.
As shown in fig. 6, for the AE/TEV two-in-one sensor according to an embodiment of the present invention, in this embodiment, the back plate of the AE/TEV two-in-one sensor is a magnetic attraction back plate 11a, which is fixed on the inner wall of the ring main unit 100 through magnetic attraction. As shown in fig. 7, for the AE/TEV two-in-one sensor according to an embodiment of the present invention, in this embodiment, screw holes 11b are disposed at four corners of the back plate of the AE/TEV two-in-one sensor, and are fixed on the inner wall of the ring main unit 100 by screws.
The monitoring principle is as follows: when partial discharge occurs due to insulation failure in the high voltage ring main unit and its internal high voltage devices, such as PT, CT, bus bar, cable joint, etc., there are physical or chemical phenomena and corresponding processes, such as pulse current, electromagnetic wave, ultrasonic wave, light, ozone, heat, etc. Therefore, the detection method mainly uses ultrasonic waves and electromagnetic waves as detection indexes and comprises two methods, namely an ultrasonic wave monitoring method and a transient ground voltage monitoring method. Wherein, the ultrasonic monitoring method: when discharge occurs inside the ring main unit, violent impact is generated among molecules in a discharge area, sound waves are generated macroscopically, the frequency of the sound waves is greater than 20kHz and is called ultrasonic waves, and a method for judging partial discharge by detecting ultrasonic signals generated by partial discharge is called a partial discharge ultrasonic detection method. Transient voltage monitoring method: according to the maxwell electromagnetic field theory, partial discharge can generate a changing electric field, the changing electric field excites a magnetic field, the changing magnetic field induces the electric field, and thus the alternating electric field and the magnetic field are mutually excited and spread outwards to form electromagnetic waves. For internal discharge, the amount of discharge charge is concentrated on the inner surface of the ground shield, and therefore, if the shield layer is continuous, a discharge signal cannot be detected externally. Actually, the shielding layer is usually damaged and discontinuous at an insulating part, a gasket joint, a cable insulation terminal and the like, so that electromagnetic waves generated by partial discharge are transmitted to the surface of the equipment through the discontinuous part of the shielding layer, induced currents are generated on the surface of the equipment, wave impedance exists on the surface of the equipment, and 1 transient voltage to ground, referred to as TEV, is formed on the outer layer of the equipment. A method of determining a partial discharge by detecting an electromagnetic wave signal generated by the partial discharge is called a transient ground voltage detection method of the partial discharge. The AE/TEV two-in-one sensor of the present invention can be used for sensing the ultrasonic signal and the electromagnetic signal generated by the ring main unit when the partial discharge occurs.
The utility model discloses a looped netowrk cabinet partial discharge monitoring system can monitor ultrasonic signal and electromagnetic wave signal that main insulating material trouble, insulating material surface and air medium trouble arouse to and insulating material filthy surface creepage, flashover etc. that arouse. The AE/TEV two-in-one sensor is designed in an integrated mode of ultrasonic wave (AE) and Transient Earth Voltage (TEV), can accurately reflect the partial discharge condition in the ring main unit, and the 16-channel ring main unit partial discharge monitoring device adopts comprehensive anti-interference measures such as analog filtering, pulse grouping, periodic pulse elimination, dynamic threshold value setting and the like, and can receive 16 partial discharge sensor signals. The system installs each partial discharge signal acquisition module in the looped netowrk cabinet, and accessible monitoring software real-time supervision each measurement station's discharge information on the host computer.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, but rather is described in the foregoing embodiments and the description with reference to the principles of the invention and that various changes and modifications may be made without departing from the spirit and scope of the invention, and it is intended that all such changes and modifications fall within the scope of the invention as claimed, which is defined by the claims appended hereto and their equivalents.
Claims (8)
1. The utility model provides a looped netowrk cabinet partial discharge monitoring system, its characterized in that, including setting up at inside partial discharge signal acquisition module (1) of looped netowrk cabinet (100), establishing first anti-interference shielding box (2) and the second of looped netowrk cabinet (100) outside are anti-interference shielding box (3), be equipped with multichannel signal conditioning circuit in first anti-interference shielding box (2), the second is anti-interference shielding box (3) in be equipped with multichannel looped netowrk cabinet partial discharge monitoring devices, partial discharge signal acquisition module (1) inserts through two way signal lines two way signal conditioning circuit of correspondence in the first anti-interference shielding box (2), two way signal conditioning circuit that should correspond insert multichannel looped netowrk cabinet partial discharge monitoring devices's two way signal input ports, multichannel looped netowrk cabinet partial discharge monitoring devices's signal output port passes through communication interface and host computer connection.
2. The ring main unit partial discharge monitoring system according to claim 1, wherein the multi-channel ring main unit partial discharge monitoring device is a 16-channel ring main unit partial discharge monitoring device (4), 16 signal input ports of the multi-channel ring main unit partial discharge monitoring device are respectively connected with one signal conditioning circuit in a one-to-one correspondence manner, the signal conditioning circuit is a corresponding 16 signal conditioning circuit, the number of the partial discharge signal acquisition modules (1) is 8, and each partial discharge signal acquisition module (1) is respectively connected with two corresponding signal input ports of the 16-channel ring main unit partial discharge monitoring device (4) through two signal conditioning circuits.
3. The partial discharge monitoring system of the ring main unit according to claim 2, wherein the 16-channel ring main unit partial discharge monitoring device (4) is a 16-channel ring main unit partial discharge monitoring device with a model number QYAE-SCC-PV.
4. The ring main unit partial discharge monitoring system of claim 3, wherein the partial discharge signal acquisition module (1) is an AE/TEV two-in-one sensor.
5. The ring main unit partial discharge monitoring system of claim 4, wherein the AE/TEV two-in-one sensor is an AE/TEV two-in-one sensor with a model number QYAE-CTU 01.
6. The ring main unit partial discharge monitoring system of claim 5, wherein the back plate of the AE/TEV two-in-one sensor is a magnetic back plate (11 a) fixed on the inner wall of the ring main unit (100) by magnetic attraction.
7. The ring main unit partial discharge monitoring system of claim 5, wherein the back plate of the AE/TEV two-in-one sensor has screw holes (11 b) at four corners, and the screw holes are fixed on the inner wall of the ring main unit (100) by screws.
8. The ring main unit partial discharge monitoring system according to claim 1, wherein a first cable chamber (5) capable of shielding electromagnetic interference is provided between the first anti-interference shielding box (2) and the ring main unit (100), and a second cable chamber (6) capable of shielding electromagnetic interference is provided between the first anti-interference shielding box (2) and the second anti-interference shielding box (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221500022.0U CN218767175U (en) | 2022-06-15 | 2022-06-15 | Ring main unit partial discharge monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221500022.0U CN218767175U (en) | 2022-06-15 | 2022-06-15 | Ring main unit partial discharge monitoring system |
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| Publication Number | Publication Date |
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| CN218767175U true CN218767175U (en) | 2023-03-28 |
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| CN202221500022.0U Active CN218767175U (en) | 2022-06-15 | 2022-06-15 | Ring main unit partial discharge monitoring system |
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2022
- 2022-06-15 CN CN202221500022.0U patent/CN218767175U/en active Active
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