GIS partial discharge detection device based on coupling capacitance method

Abstract

The utility model discloses a GIS partial discharge detection device based on a coupling capacitance method. The GIS partial discharge detection device comprises a solar blind photoelectric detector, a single electron detector, a photomultiplier sensor, a signal conversion module, a capacitive sensor, a data acquisition module, a database and a single-chip microcomputer module. The solar blind photoelectric detector, the single electron detector and the photomultiplier sensor are mounted on the inner wall of the GIS; the signal conversion module, the capacitive sensor and the data acquisition module are mounted on the outer wall of the GIS; the signal conversion module is electrically connected with the solar blind photoelectric detector and the photomultiplier sensor respectively; the data acquisition module is electrically connected with the signal conversion module and the capacitive sensor respectively; the single-chip microcomputer module and the database are electrically connected with the data acquisition module in sequence. According to the utility model, data can be collected, sensitivity can be improved, interference resistance can be realized, and problems of poor anti-interference capability and easy electromagnetic wave interference existing in a coupling capacitance method can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of GIS local discharge detection, in particular to a GIS local discharge detection device based on a coupling capacitance method. Background Art

[0002] Enclosed insulated switchgear (GIS) has high reliability and is widely used in power systems. GIS equipment combines circuit breakers, grounding switches, disconnectors, voltage transformers, current transformers, busbars, lightning arresters and other equipment, and seals them in a closed insulating metal tank filled with SF6 gas. The internal size of the GIS tank is relatively small and the internal structure is compact. Once there are defects such as assembly errors, free metal particles, poor contact and floating potential, metal protrusions on the conductor surface and metal particles on the insulator surface, the insulation of the GIS equipment will be weakened, and the consequences are very serious.

[0003] GIS insulation detection technology has always been a common concern of power supply operation departments and scientific researchers. At present, GIS equipment insulation monitoring technology is mainly divided into three categories: lightning impulse test method, voltage withstand test method and partial discharge monitoring method. Partial discharge monitoring is further divided into non-electrical measurement method and electrical measurement method. Non-electrical measurement methods for partial discharge include acoustic measurement method and chemical measurement method; electrical measurement methods for partial discharge include coupling capacitance method, ground current method, internal electrode method, external electrode method and ultra-high frequency method.

[0004] The coupling capacitor method is also called the pulse current method. When the GIS generates partial discharge, an instantaneous voltage is generated inside the GIS. When a capacitive sensor is connected to the GIS shell, a pulse current signal is generated. The signal is converted into a pulse voltage signal through the input impedance of the input end, and then filtered, amplified, signal collected and calculated to measure some basic physical quantities of partial discharge (such as apparent discharge amount, size of partial discharge pulse, phase, etc.). The advantage of this method is that it can quantitatively measure the amount of partial discharge inside the GIS. The quantitative measurement of the discharge amount can more intuitively reflect the severity of the partial discharge of the system and the insulation condition. Its disadvantage is that its anti-interference ability is relatively poor and it is easily interfered by electromagnetic waves. Therefore, the market currently mainly relies on the ultra-high frequency method to monitor the partial discharge of GIS, and lacks detection devices that use the coupling capacitor method to detect the partial discharge of GIS. However, the ultra-high frequency method cannot specifically detect the discharge amount of partial discharge, so it is impossible to judge the internal situation of GIS by detecting the size of the partial discharge of GIS. Utility Model Content

[0005] The utility model aims to provide a GIS partial discharge detection device based on a coupling capacitor method, so as to solve the problem that the coupling capacitor method has poor anti-interference ability and is easily interfered by electromagnetic waves.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A GIS partial discharge detection device based on a coupled capacitance method, comprising a solar-blind photoelectric detector, a single electron detector, a photomultiplier sensor, a signal conversion module, a capacitive sensor, a data acquisition module, a database, and a single-chip computer module;

[0008] The solar-blind photoelectric detector is installed on the inner wall of the GIS equipment to monitor the ultraviolet rays generated by partial discharge of the GIS;

[0009] The single electron detector is installed on the inner wall of the GIS equipment to monitor the visible light waves and electromagnetic waves generated by the partial discharge of the GIS;

[0010] The photomultiplier sensor is installed on the inner wall of the GIS equipment and connected to the single electron detector to amplify the signal of the single electron detector;

[0011] The signal conversion module is installed on the outer wall of the GIS equipment and is connected to the solar-blind photoelectric detector and the photomultiplier sensor respectively, and is used to convert the signals transmitted by the solar-blind photoelectric detector and the photomultiplier sensor into electrical signals;

[0012] The capacitive sensor is installed on the outer wall of the GIS equipment and is used to generate a pulse signal similar to the pulse signal generated by the partial discharge of the GIS equipment to determine the magnitude of the partial discharge;

[0013] The data acquisition module is installed on the outer wall of the GIS equipment, and is electrically connected to the signal conversion module and the capacitive sensor, respectively, to collect, record and analyze the signal data of the signal conversion module and the capacitive sensor;

[0014] The single-chip computer module and the database are electrically connected to the data acquisition module in sequence; the database is used to store all previous partial discharge data; the single-chip computer module is used to read the data transmitted to the data acquisition module and the previous partial discharge data stored in the database, and perform comparative analysis to confirm the occurrence of partial discharge in the GIS equipment, and then combine and analyze the pulse signal data generated by the coupling capacitor of the capacitive sensor to reflect the amount of discharge.

[0015] Preferably, it also includes a shell, which is installed on the outer wall of the GIS equipment, and the signal conversion module, capacitive sensor, data acquisition module, database, and single-chip computer module are all installed in the shell.

[0016] Preferably, the housing is provided with an indicator light and a display screen; the indicator light and the display screen are electrically connected to the single-chip microcomputer module respectively.

[0017] Preferably, the indicator lights include indicator lights in three colors: red, yellow and green.

[0018] Preferably, the display screen is an operable liquid crystal display.

[0019] Preferably, the single-chip microcomputer module is an Arduino Mega single-chip microcomputer.

[0020] Preferably, it also includes a buzzer, which is arranged on the housing and connected to the indicator light.

[0021] Preferably, it also includes a modular power supply, the modular high-voltage charging power supply is installed in the shell, connected to the signal conversion module, the capacitive sensor, the single-chip computer module, and the database to provide power.

[0022] Preferably, the device can be connected to a computer or other data recording device to facilitate recording and saving discharge data for subsequent analysis and reporting.

[0023] The principle of the utility model is:

[0024] The utility model is based on the coupling capacitor method. When there is discharge in the GIS equipment, the discharge signal and pulse will be transmitted to the outer surface of the equipment through the dielectric, and the dielectric coupling capacitor between the outer surface and the inner surface will produce potential and pulse changes due to the existence of the discharge signal. This change is used to judge the existence of discharge and calculate the discharge amount. Among them, the solar-blind photoelectric detector and the single-electron detector mainly play the role of improving sensitivity and collecting data for anti-interference.

[0025] Compared with the prior art, the beneficial effects of the utility model are:

[0026] 1. The utility model adopts the coupling capacitor method, which can monitor the discharge amount and discharge type. The discharge amount and discharge type of GIS local discharge can be used to analyze the insulation condition inside the GIS equipment, so as to analyze the appropriate maintenance time and maintenance plan. By adopting the solar-blind photoelectric detector and the single electron detector, it plays a role in improving sensitivity and collecting data for anti-interference, solving the problem of poor anti-interference ability and susceptibility to electromagnetic interference in the coupling capacitor method.

[0027] 2. The utility model can realize real-time monitoring, quickly and accurately detect the discharge situation inside the GIS equipment, discover potential problems in time, avoid the expansion of problems, ensure the safe operation of the equipment, and have high detection efficiency and fast response.

[0028] 3. The utility model improves detection accuracy through anti-interference design, which can reduce false alarms and missed alarms; it can obtain the type, location, and discharge amount of local discharge of GIS equipment, provide strong data support for equipment maintenance, and help maintenance personnel formulate reasonable maintenance plans. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0030] Figure 2 This is a schematic diagram of the structure of the housing of an embodiment of the utility model;

[0031] Figure 3 It is a principle block diagram of an embodiment of the utility model;

[0032] Figure 4 A circuit diagram of an embodiment of the utility model;

[0033] The serial numbers and names in the figure are as follows:

[0034] 1-GIS equipment; 2-day-blind photoelectric detector; 3-single electron detector; 4-photomultiplier sensor; 5-signal conversion module; 6-capacitive sensor; 7-housing; 8-data acquisition module; 9-database; 10-single-chip computer module; 11-indicator light; 12-display screen. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] Example

[0037] A GIS partial discharge detection device based on coupling capacitance method, such as Figure 1 As shown, it includes a solar-blind photoelectric detector 2, a single electron detector 3, a photomultiplier sensor 4, a signal conversion module 5, a capacitive sensor 6, a data acquisition module 8, a database 9, and a single-chip computer module 10;

[0038] The solar-blind photoelectric detector 2 is installed on the inner wall of the GIS device 1 and is used to monitor ultraviolet rays in the solar-blind band of 260nm-280nm generated when the GIS is partially discharged;

[0039] The single electron detector 3 is installed on the inner wall of the GIS device 1 to monitor the visible light waves and electromagnetic waves generated during its partial discharge;

[0040] Solar-blind photoelectric detector 2 and single electron detector 3 accurately locate the location and time of partial discharge, and solve the interference problem through data integration and analysis;

[0041] Since the signal generated by the photodiode (PD) of the single photon detector 3 is weak, a photomultiplier sensor 4 is used to amplify its signal data. The photomultiplier sensor 4 is installed on the inner wall of the GIS device 1 and connected to the single electron detector 3;

[0042] The signal conversion module 5 is installed on the outer wall of the GIS device 1, and is connected to the solar-blind photoelectric detector 2 and the photomultiplier sensor 4 respectively, and is used to convert the signals transmitted by the solar-blind photoelectric detector 2 and the photomultiplier sensor 4 into electrical signals;

[0043] The capacitive sensor 6 is installed on the outer wall of the GIS device 1, and its coupling capacitor can generate a pulse signal similar to the pulse signal generated by the GIS partial discharge. By combining it with the data of the partial discharge situation, the magnitude of the partial discharge can be determined;

[0044] The data acquisition module 8 is installed on the outer wall of the GIS device 1, and is electrically connected to the signal conversion module 5 and the capacitive sensor 6, respectively, for collecting, recording and analyzing the signal data of the signal conversion module 5 and the capacitive sensor 6;

[0045] The single-chip computer module 10 and the database 9 are electrically connected to the data acquisition module 8 in sequence; the database 9 is used to store all previous partial discharge data; the single-chip computer module 10 is used to read the data transmitted to the data acquisition module 8 and the previous partial discharge data stored in the database 9, and perform comparative analysis to confirm the occurrence of partial discharge in the GIS equipment 1, and then combine and analyze the pulse signal data generated by the coupling capacitor of the capacitive sensor 6 to reflect the amount of discharge.

[0046] In this embodiment, a shell 7 is also included, and the shell 7 is installed on the outer wall of the GIS device 1. The signal conversion module 5, the capacitive sensor 6, the data acquisition module 8, the database 9, and the single-chip computer module 10 are all installed in the shell 7.

[0047] In this embodiment, the housing 7 is provided with an indicator light 11, a display screen 12, and a buzzer; the indicator light 11 and the display screen 12 are electrically connected to the single-chip computer module 10 respectively; the indicator light 11 includes three colors: red, yellow, and green, and the display screen 12 is an operable liquid crystal display screen; the buzzer is arranged on the housing 7 and connected to the indicator light 11.

[0048] In this embodiment, a modular high-voltage charging power supply is also included. The modular high-voltage charging power supply is installed in the housing 7 and is connected to the signal conversion module 5, the capacitive sensor 6, the single-chip computer module 10, and the database 9 to provide power. The modular high-voltage charging power supply should have an input voltage of 12KV and an output current of 1mA.

[0049] The working process of the utility model is as follows Figure 3 As shown:

[0050] When there is discharge in GIS equipment 1, the discharge signal and pulse will be transmitted to the outer surface of the equipment through the dielectric, and the dielectric coupling capacitance between the outer surface and the inner surface will undergo potential and pulse changes due to the existence of the discharge signal; first, the local discharge inside the GIS equipment 1 is monitored by the photoelectric detector 2 and the single electron detector 3 installed inside the GIS equipment 1. Once the local discharge occurs inside the GIS equipment 1 due to local electric field distortion, local field concentration, gas discharge or breakdown in the local range of the insulating medium, free metal particles, metal protrusions, suspended electrodes, etc., a series of insulation states inside and around the GIS equipment 1 can be monitored through the physical phenomena and chemical changes such as light, sound, electrical and mechanical vibrations generated by the local discharge; among them, the photoelectric detector 2 detects the ultraviolet signal with a solar-blind band of 260nm to 280nm generated by the local discharge of the GIS equipment 1; the single electron detector 3 detects the visible light and current pulses generated by the local discharge to excite electromagnetic waves, including medium and low frequency and UHF bands (0.3~3GHz) electromagnetic wave, and then the photomultiplier sensor 4 amplifies the data; then, the signal conversion module 5 converts the light signal detected by the photodetector 2 and the light signal and electromagnetic wave signal amplified by the photomultiplier sensor 4 into a voltage signal, and transmits it to the data acquisition module 8, all the previous data stored in the database 9, and finally the single-chip computer module 10 reads and analyzes the data transmitted to the data acquisition module 8, and analyzes and compares it with the previous data in the database 9, and then obtains the specific situation of GIS local discharge. The analyzed data includes the intensity frequency of visible light, the wavelength of ultraviolet light, the change of capacitor potential, the size of the pulse, etc. The type and location of GIS local discharge are judged by the analysis results; the capacitive sensor 6 generates a similar pulse signal according to the pulse signal generated by the GIS local discharge, and transmits it to the data acquisition module 8. The single-chip computer module 10 reads the data and combines it with the data on the type and location of GIS local discharge to analyze and reflect the size of the discharge.

[0051] The circuit connection of the utility model is as follows Figure 3As shown, the device components are controlled by the CPU of the single-chip module, the day-blind photodetector signal is transmitted to the P00 pin 39, the single-photon detector signal is transmitted to the ALE / PROG pin 30 by the photomultiplier signal, and the data module is connected to the P32 / CS1 pin 12 and the P33 / CS2 pin 13 through a parallel circuit to transmit data.

[0052] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A GIS partial discharge detection device based on coupling capacitance method, characterized in that: It includes a solar-blind photoelectric detector (2), a single electron detector (3), a photomultiplier sensor (4), a signal conversion module (5), a capacitive sensor (6), a data acquisition module (8), a database (9), and a single-chip computer module (10); The solar-blind photoelectric detector (2) is installed on the inner wall of the GIS device (1) and is used to monitor ultraviolet rays generated when the GIS is partially discharged; The single electron detector (3) is installed on the inner wall of the GIS device (1) and is used to monitor the visible light waves and electromagnetic waves generated when the GIS is partially discharged; The photomultiplier sensor (4) is installed on the inner wall of the GIS device (1) and connected to the single electron detector (3) to amplify the signal of the single electron detector (3); The signal conversion module (5) is installed on the outer wall of the GIS device (1), and is connected to the solar-blind photoelectric detector (2) and the photomultiplier sensor (4) respectively, and is used to convert the signals transmitted by the solar-blind photoelectric detector (2) and the photomultiplier sensor (4) into electrical signals; The capacitive sensor (6) is installed on the outer wall of the GIS device (1) and is used to generate a pulse signal similar to the pulse signal generated by the GIS partial discharge; The data acquisition module (8) is installed on the outer wall of the GIS device (1), and is electrically connected to the signal conversion module (5) and the capacitive sensor (6) respectively, and is used to collect, record and analyze signal data of the signal conversion module (5) and the capacitive sensor (6); The single-chip computer module (10) and the database (9) are electrically connected to the data acquisition module (8) in sequence; the database (9) is used to store all previous partial discharge data; the single-chip computer module (10) is used to compare and analyze the data transmitted to the data acquisition module (8) with the previous partial discharge data stored in the database (9) to confirm the partial discharge situation of the GIS equipment (1), and then combine and analyze the pulse signal data generated by the coupling capacitor of the capacitive sensor (6) to reflect the discharge amount.

2. The GIS partial discharge detection device based on the coupling capacitance method according to claim 1 is characterized in that: It also comprises a shell (7), the shell (7) being mounted on the outer wall of the GIS device (1), and the signal conversion module (5), the capacitive sensor (6), the data acquisition module (8), the database (9), and the single-chip computer module (10) being all mounted inside the shell (7).

3. The GIS partial discharge detection device based on the coupling capacitance method according to claim 2 is characterized in that: An indicator light (11) and a display screen (12) are provided on the housing (7); the indicator light (11) and the display screen (12) are electrically connected to the single-chip computer module (10) respectively.

4. The GIS partial discharge detection device based on the coupling capacitance method according to claim 3 is characterized in that: It also includes a buzzer, which is arranged on the housing (7) and connected to the indicator light (11).

5. The GIS partial discharge detection device based on the coupling capacitance method according to claim 2 is characterized in that: It also includes a modular high-voltage charging power supply, which is installed in a housing (7) and connected to a signal conversion module (5), a capacitive sensor (6), a single-chip computer module (10), and a database (9) to provide power.

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