Partial discharge monitoring device based on capacitive coupling high-frequency pulse current method
By using the capacitively coupled high-frequency pulse current method in the partial discharge monitoring device, the problems of insufficient local discharge detection sensitivity and limited detection distance in the prior art are solved, efficient and accurate local discharge monitoring are achieved, and the service life of the equipment and the reliability of monitoring are improved.
Patent Information
- Application Number
- CN202421039063.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-13
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-05-13
AI Technical Summary
The prior art has problems such as insufficient sensitivity in local discharge detection, limited detection distance, and inapplicable internal discharge detection of non-transparent insulating materials, making it difficult to achieve efficient and accurate local discharge monitoring.
The local discharge monitoring device based on the capacitively coupled high-frequency pulse current method is adopted, including a sensor module, a signal amplification module, an oscilloscope and a monitoring host. The high-frequency pulse current signal is transmitted to the monitoring device through capacitive coupling technology to realize real-time monitoring and processing.
It improves the accuracy and reliability of local discharge monitoring, enhances anti-interference ability, simplifies the installation process, reduces artificial workload, and extends the service life of the equipment.
Smart Images
Figure CN222838146U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of partial discharge detection, and in particular relates to a partial discharge monitoring device based on a capacitive coupling high-frequency pulse current method. Background Art
[0002] With the development and application of power equipment, partial discharge defects have become a major hidden danger in power equipment. Partial discharge defects can cause damage to power transformers and even destroy the stable operation of the power system, bringing great harm to production and personal safety.
[0003] Nowadays, there are many ways to detect partial discharge, such as the following detection methods:
[0004] (1) Noise detection method: Use an acceleration sensor on the grounded shell of the electrical equipment to detect the ultrasonic vibration generated by partial discharge. After signal amplification or filtering, the strength of the discharge is displayed by an indicating instrument or oscilloscope. Its advantages are simple structure, strong resistance to spatial electromagnetic interference, and the directional characteristics of sound waves. Local discharge positioning. The disadvantages are that it may not be sensitive to partial discharge phenomena that do not produce obvious ultrasonic vibrations, and the sound may attenuate during the propagation process. The detection distance is limited and affected by obstacles in the propagation path, requiring experienced operators.
[0005] (2) Optical measurement method: Use photomultiplier tube to measure partial discharge. Its characteristics are extremely fast signal transmission effect, no external interference, reliable insulation from high voltage test system, and easy to determine the discharge position. Therefore, it is suitable for the study of surface discharge and transparent insulation internal discharge process. The disadvantage is that it may require expensive and complex optical equipment, which may not be applicable to the internal discharge detection of non-transparent insulating materials.
[0006] (3) Thermal detection method: Measure the temperature rise caused by partial discharge to determine the location of partial discharge. This method is neither sensitive nor quantitative. The disadvantages are low sensitivity, poor quantitative accuracy, and may not be able to accurately detect instantaneous discharge.
[0007] (4) Discharge product analysis method: It analyzes the amount of chemical gas produced during partial discharge to determine the degree of discharge. It is mostly applicable to partial discharge analysis of gas insulation and liquid insulation, such as insulating oil chromatography analysis. The disadvantage is that it may require professional chemical analysis and equipment, and the analysis of discharge products may be subjective.
[0008] (5) Radio interference measurement method: It uses a radio interference meter to detect the interference to radio communications caused by partial discharge. This method is widely used internationally and has a high sensitivity for detecting discharge in gas, but the detection sensitivity is significantly reduced for partial discharge in oil where the discharge takes a long time to form. The disadvantage is that the sensitivity is significantly reduced for partial discharge in oil, especially when the discharge lasts for a long time.
[0009] (6) Pulse current measurement method: It causes partial discharge of high-voltage equipment to generate high-frequency current pulses in the test circuit, and generates voltage pulses through the detection impedance. After amplification by a suitable bandwidth amplifier, the discharge charge is measured by the instrument. This is the most widely used method at present. The disadvantage is that it may require a more complex test circuit and high-performance detection equipment.
[0010] Therefore, it is very necessary and important to develop a reliable and efficient partial discharge monitoring device. Utility Model Content
[0011] In view of the shortcomings of the prior art, the utility model provides a partial discharge monitoring device based on the capacitive coupling high-frequency pulse current method, which is easy to install, can reduce manual workload, and is efficient, accurate, and has strong anti-interference ability, thereby improving the working efficiency of the partial discharge monitoring device and the service life of the switching equipment.
[0012] In order to achieve the above object, the technical solution of the utility model is:
[0013] A partial discharge monitoring device based on a capacitive coupling high-frequency pulse current method comprises a sensor module, a signal amplification module, an oscilloscope and a monitoring host, wherein the sensor module is connected to the signal amplification module, the signal amplification module is connected to the oscilloscope, and the oscilloscope is connected to the monitoring host;
[0014] The monitoring host is provided with a microprocessor module, an electrical signal transmission module, a storage module and a power supply module; the electrical signal transmission module, the storage module and the power supply module are all connected to the microprocessor module;
[0015] The front panel of the monitoring host is provided with an intelligent display screen, a fault indicator light, a power indicator light and an interface socket; the interface socket is connected to the electrical signal transmission module, and the intelligent display screen, the fault indicator light and the power indicator light are all connected to the microprocessor module.
[0016] Preferably, the electrical signal transmission module includes a filtering circuit, an amplifying circuit and an A / D conversion circuit; the filtering circuit is connected to the interface socket, the amplifying circuit is connected to the filtering circuit, the A / D conversion circuit is connected to the amplifying circuit, and the microprocessor module is connected to the A / D conversion circuit.
[0017] Preferably, a display screen interaction button is also provided on the front panel of the monitoring host, and the display screen interaction button is connected to the microprocessor module and is used to adjust the switching of display content on the smart display screen.
[0018] Preferably, an operation indicator light, a power indicator light and a USB interface are also provided on the front panel of the monitoring host, and the operation indicator light, the power indicator light and the USB interface are all connected to the microprocessor module; the oscilloscope is connected to the monitoring host via the USB interface.
[0019] Preferably, the sensor module includes a current sensor for collecting electrical signals of current.
[0020] Preferably, the signal amplification module includes an automatic gain amplifier.
[0021] Preferably, the interface seat is a three-phase interface seat, which includes an interface seat A, an interface seat B and an interface seat C which are horizontally and sequentially spaced apart.
[0022] Preferably, the power indicator light comprises a power indicator light A, a power indicator light B and a power indicator light C; the power indicator light A, the power indicator light B and the power indicator light C correspond to the interface seat A, the interface seat B and the interface seat C respectively;
[0023] Preferably, the fault indicator light includes a fault indicator light A, a fault indicator light B, a fault indicator light C and a neutral point N; the fault indicator light A, the fault indicator light B, and the fault indicator light C correspond to the interface seat A, the interface seat B and the interface seat C respectively.
[0024] Technical effects and advantages of the utility model:
[0025] 1. The utility model provides a partial discharge monitoring device based on the capacitive coupling high-frequency pulse current method. By adopting a sensor module, a signal amplification module and an oscilloscope, the current spike signal of the partial discharge of the line can be transmitted into the partial discharge monitoring device, so that the discharge waveform data can be conveniently monitored in real time. Then, the discharge waveform data can be transmitted to the monitoring host for processing and display, thereby improving the accuracy and reliability of monitoring.
[0026] 2. The utility model provides a partial discharge monitoring device based on the capacitive coupling high-frequency pulse current method. By adopting a monitoring host and utilizing the display screen, fault indicator light, and live indicator light on the monitoring host, the working condition of the partial discharge monitoring device, the fault condition of the protected equipment, and the environmental condition of the entire system can be intuitively reflected, thereby realizing early knowledge of partial discharge, making the monitoring results simple and easy to read, facilitating inspection personnel to judge the insulation condition of the switch cabinet, promptly dealing with existing insulation hazards, improving the reliability of the operation of the distribution equipment, reducing workload and quickly discovering partial discharge, and minimizing losses. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 It is a structural schematic diagram of a partial discharge monitoring device of the utility model;
[0028] Figure 2 It is a circuit diagram of an electric signal transmission module of a partial discharge monitoring device of the utility model;
[0029] Figure 3 It is a structural schematic diagram of the monitoring host of the utility model.
[0030] Numbers in the figure: 1. Sensor module; 2. Signal amplification module; 3. Oscilloscope; 4. Monitoring host; 41. Microprocessor module; 42. Electrical signal transmission module; 421. Filter circuit; 422. Amplification circuit; 423. A / D conversion circuit; 43. Storage module; 44. Power module; 401. Intelligent display screen; 402. Power indicator light; 403. Fault indicator light; 404. Interface socket; 405. Display screen interaction button; 406. Operation indicator light; 407. Power indicator light; 408. USB interface. DETAILED DESCRIPTION
[0031] The present invention is further described in detail below with reference to the embodiments given in the accompanying drawings.
[0032] The present application discloses a partial discharge monitoring device based on a capacitive coupling high-frequency pulse current method, which is an online monitoring device installed on primary switch equipment such as a ring main unit, a switch cabinet, a cable branch box, and a box transformer in a power distribution network system to monitor partial discharge and live conditions of cables.
[0033] See also Figure 1 As shown, the partial discharge monitoring device based on the capacitive coupling high-frequency pulse current method proposed in this example includes a sensor module 1, a signal amplification module 2, an oscilloscope 3 and a monitoring host 4, wherein the sensor module 1 is connected to the signal amplification module 2, the signal amplification module 2 is connected to the oscilloscope 3, and the oscilloscope 3 is connected to the monitoring host 4.
[0034] Among them, the sensor module 1 is a current sensor responsible for collecting the electrical signal of the current, the signal amplification module 2 is an automatic gain amplifier for amplifying the collected signal, and the oscilloscope 3 is used to display and record the signal waveform and transmit it to the monitoring host 4 for further processing, storage and display. The monitoring host 4 is connected to the three-phase line of the primary switch device to receive the current spike signal of the partial discharge of the line.
[0035] In one embodiment, see Figure 1As shown, the monitoring host 4 is provided with a microprocessor module 41 , an electrical signal transmission module 42 , a storage module 43 and a power module 44 ; the electrical signal transmission module 42 , the storage module 43 and the power module 44 are all connected to the microprocessor module 41 .
[0036] Among them, see Figure 2 As shown, the electrical signal transmission module 42 includes a filtering circuit 421, an amplifying circuit 422 and an A / D conversion circuit 423; the filtering circuit 421 is connected to the interface socket 404, the amplifying circuit 422 is connected to the filtering circuit 421, the A / D conversion circuit 423 is connected to the amplifying circuit 422, and the microprocessor module 41 is connected to the A / D conversion circuit 423.
[0037] The present application achieves a higher degree of automation and intelligence by adopting a monitoring host 4. The staff only needs to connect the partial discharge monitoring device to the primary equipment that needs to be monitored. When the primary equipment of the power system operates normally and no partial discharge occurs, it is only necessary to pay attention to the apparent discharge data displayed on the smart display screen 401 on the monitoring host 4 in real time. If the data fluctuates greatly before the monitoring host 4 issues a fault alarm, it is necessary to immediately find the cause of the data fluctuation and eliminate potential factors that may cause partial discharge, so as to prevent the occurrence of partial discharge in advance.
[0038] If partial discharge occurs, the monitoring host 4 will send out an alarm signal, and the staff must immediately power off the primary switch equipment and remove the partial discharge monitoring device from the switch equipment, and ask professional maintenance personnel to perform maintenance on the partial discharge fault point until the cause of the fault is eliminated, and then the primary switch equipment can be restored to power and the partial discharge monitoring device can be reintegrated into the system. If the location of the partial discharge is not easy to find, the measurement data automatically saved in the monitoring host 4 can be loaded into other equipment such as a computer, and data analysis can be performed, such as measuring the relationship between impedance, apparent discharge size, etc. and the corresponding fault location, so that the partial discharge point can be accurately found and the partial discharge can be eliminated.
[0039] In one embodiment, see Figure 3 As shown, the front panel of the monitoring host 4 is provided with an intelligent display screen 401, a fault indicator light 403, a power indicator light 402 and an interface socket 404; the interface socket 404 is connected to the electrical signal transmission module 42, and the intelligent display screen 401, the fault indicator light 403 and the power indicator light 402 are all connected to the microprocessor module 41.
[0040] The interface socket 404 is a three-phase interface socket, which includes an interface socket A, an interface socket B and an interface socket C which are arranged horizontally and spaced apart in sequence.
[0041] The power indicator light 402 includes a power indicator light A, a power indicator light B and a power indicator light C; the power indicator light A, the power indicator light B and the power indicator light C correspond to the interface socket A, the interface socket B and the interface socket C respectively;
[0042] The fault indicator light 403 includes a fault indicator light A, a fault indicator light B, a fault indicator light C and a neutral point N; the fault indicator light A, the fault indicator light B and the fault indicator light C correspond to the interface socket A, the interface socket B and the interface socket C respectively.
[0043] The monitoring host 4 can be connected to the three-phase line of the primary switchgear through the interface socket A, interface socket B and interface socket C to receive the current spike signal of the partial discharge of the line. If the monitoring host 4 is successfully connected to the line, the live indicator light 402 will light up, which can detect the reliability of the installation of the partial discharge monitoring device and reduce the situation of abnormal operation or endangerment to personal safety caused by installation errors. Through the fault indicator light 403, it is most intuitive to observe whether the primary switchgear has a fault, and the approximate situation of the fault location, so that the staff can find the fault in time and repair it. Through the display screen 401, the partial discharge discharge amount of the ABC three-phase, the discharge number of the ABC three-phase, the upper and lower contact temperatures of the ABC three-phase, the fault indication of the ABCN four-phase, the live indication of the ABC three-phase, and the storage of the waveform can be measured in real time.
[0044] Since each set of data occupies an entire screen independently, a display screen interaction button 405 is also provided on the front panel of the monitoring host 4. The display screen interaction button 405 is connected to the microprocessor module 41 and is used to adjust the display content switching on the smart display screen 401.
[0045] In one embodiment, see Figure 3 As shown, an operation indicator light 406, a power indicator light 407 and a USB interface 408 are also provided on the front panel of the monitoring host 4, and the operation indicator light 406, the power indicator light 407 and the USB interface 408 are all connected to the microprocessor module 41; the oscilloscope 3 is connected to the monitoring host 4 via the USB interface 408.
[0046] The operation indicator light 406 and the power indicator light 407 can be used to more intuitively observe whether the power is connected and whether the partial discharge monitoring device is operating normally; the USB interface 408 can be used to connect to the oscilloscope 3, thereby conveniently receiving data transmitted by the oscilloscope 3, and the USB interface 408 can be used to conveniently connect to external devices and facilitate data transmission.
[0047] It can be seen that the present application utilizes the smart display screen 401, the fault indicator light 403, the power indicator light 402, etc. to intuitively reflect the working condition of the partial discharge monitoring device, the fault condition of the protected equipment, and the environmental condition of the entire system, thereby realizing early knowledge of partial discharge, which is conducive to reducing workload and quickly discovering partial discharge, thereby minimizing losses.
[0048] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements all fall within the protection scope of the present invention.
Claims
1. A partial discharge monitoring device based on a capacitively coupled high frequency pulse current method, characterized in that: The device comprises a sensor module (1), a signal amplification module (2), an oscilloscope (3) and a monitoring host (4), wherein the sensor module (1) is connected to the signal amplification module (2), the signal amplification module (2) is connected to the oscilloscope (3), and the oscilloscope (3) is connected to the monitoring host (4); The monitoring host (4) is provided with a microprocessor module (41), an electrical signal transmission module (42), a storage module (43) and a power module (44); the electrical signal transmission module (42), the storage module (43) and the power module (44) are all connected to the microprocessor module (41); The front panel of the monitoring host (4) is provided with an intelligent display screen (401), a fault indicator light (403), a power indicator light (402) and an interface seat (404); the interface seat (404) is connected to the electrical signal transmission module (42), and the intelligent display screen (401), the fault indicator light (403) and the power indicator light (402) are all connected to the microprocessor module (41).
2. The partial discharge monitoring device based on the capacitive coupling high frequency pulse current method according to claim 1 is characterized in that: The electrical signal transmission module (42) comprises a filtering circuit (421), an amplifying circuit (422) and an A / D conversion circuit (423); the filtering circuit (421) is connected to the interface socket (404), the amplifying circuit (422) is connected to the filtering circuit (421), the A / D conversion circuit (423) is connected to the amplifying circuit (422), and the microprocessor module is connected to the A / D conversion circuit (423).
3. The partial discharge monitoring device based on the capacitive coupling high frequency pulse current method according to claim 1 is characterized in that: A display screen interaction button (405) is also provided on the front panel of the monitoring host (4), and the display screen interaction button (405) is connected to the microprocessor module (41) and is used to adjust the switching of display content on the smart display screen (401).
4. The partial discharge monitoring device based on the capacitive coupling high frequency pulse current method according to claim 1 is characterized in that: The front panel of the monitoring host (4) is also provided with an operation indicator light (406), a power indicator light (407) and a USB interface (408), and the operation indicator light (406), the power indicator light (407) and the USB interface (408) are all connected to the microprocessor module (41); the oscilloscope (3) is connected to the monitoring host (4) via the USB interface (408).
5. The partial discharge monitoring device based on the capacitive coupling high frequency pulse current method according to claim 1 is characterized in that: The sensor module (1) comprises a current sensor for collecting an electric current signal.
6. The partial discharge monitoring device based on the capacitive coupling high frequency pulse current method according to claim 1 is characterized in that: The signal amplification module (2) comprises an automatic gain amplifier.
7. The partial discharge monitoring device based on the capacitive coupling high frequency pulse current method according to claim 1 is characterized in that: The interface seat (404) is a three-phase interface seat, which comprises an interface seat A, an interface seat B and an interface seat C which are arranged horizontally and in sequence.
8. The partial discharge monitoring device based on the capacitive coupling high frequency pulse current method according to claim 7 is characterized in that: The power indicator light (402) comprises a power indicator light A, a power indicator light B and a power indicator light C; the power indicator light A, the power indicator light B and the power indicator light C correspond to the interface socket A, the interface socket B and the interface socket C respectively.
9. The partial discharge monitoring device based on the capacitive coupling high frequency pulse current method according to claim 7 is characterized in that: The fault indicator light (403) comprises a fault indicator light A, a fault indicator light B, a fault indicator light C and a neutral point N; the fault indicator light A, the fault indicator light B and the fault indicator light C correspond to the interface socket A, the interface socket B and the interface socket C respectively.