CN115656878A - Self-powered GIS basin-type insulator leakage current detection sensor - Google Patents
Self-powered GIS basin-type insulator leakage current detection sensor Download PDFInfo
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- CN115656878A CN115656878A CN202211703209.5A CN202211703209A CN115656878A CN 115656878 A CN115656878 A CN 115656878A CN 202211703209 A CN202211703209 A CN 202211703209A CN 115656878 A CN115656878 A CN 115656878A
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- 239000012212 insulator Substances 0.000 title claims abstract description 68
- 238000001514 detection method Methods 0.000 title claims abstract description 16
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- 238000004891 communication Methods 0.000 claims abstract description 37
- 239000003990 capacitor Substances 0.000 claims description 22
- 239000002184 metal Substances 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 239000004020 conductor Substances 0.000 claims description 5
- 239000003822 epoxy resin Substances 0.000 claims description 5
- 229920000647 polyepoxide Polymers 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 9
- 238000010276 construction Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 230000006698 induction Effects 0.000 abstract 1
- 238000009413 insulation Methods 0.000 description 13
- 238000004146 energy storage Methods 0.000 description 9
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- 230000032683 aging Effects 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
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- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 239000004593 Epoxy Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
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- 238000009434 installation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
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Abstract
The invention belongs to the technical field of GIS basin-type insulator leakage current measurement, and relates to a self-powered GIS basin-type insulator leakage current detection sensor, which comprises: the device comprises a shell, an induced current energy-taking coil, a leakage current sensor and a signal processing unit; the induced current energy-taking coil is wound on the outer annular wall of the GIS basin-type insulator, and the leakage current sensor comprises: shielding electrode, collection electrode, signal processing unit includes: the device comprises an electric energy acquisition and processing module, a signal acquisition and processing module and a wireless serial port communication module, wherein the electric energy acquisition and processing module is connected with the other end of the induction current energy-taking coil, and the electric energy acquisition and processing module is connected with the signal acquisition and processing module. The invention is self-powered, adopts the serial port wireless communication module, does not need construction and wiring, can greatly save materials and labor cost, is very convenient to install and implement, and does not need to carry out a large amount of complex secondary wiring in a transformer substation.
Description
Technical Field
The invention belongs to the technical field of GIS basin-type insulator leakage current measurement, and particularly relates to a self-powered GIS basin-type insulator leakage current detection sensor.
Background
GIS equipment (Gas insulated switch equipment) is widely used power equipment in the transformer substation in China at present, has the characteristics of compact structure and small occupied area, but also has the problems of few equipment inspection and detection means. In recent years, serious social and economic losses are caused by internal faults of GIS equipment which occur for many times in a power system.
The basin-type insulator is used as a main insulating support piece in the GIS equipment, and the aging condition and the insulating level of the insulating capacity of the basin-type insulator determine the service life of the whole GIS equipment, so that the monitoring of the insulating level and the aging condition of the basin-type insulator has important significance for guaranteeing the safe operation of the GIS equipment and even the safe and stable operation of a power system.
At present, the insulation resistance is an important index for GIS basin-type insulator evaluation. In the engineering use process, the insulation resistor is influenced by environmental factors such as air, dust, moisture and the like, an air gap and an insulation crack are generated inside the insulation resistor device, the insulation resistor can suddenly drop under the condition, the resistance of the insulation resistor is necessarily related to the leakage current of the system flowing through the device, and the resistance and the insulation performance of the insulation resistor can be calculated through measurement of the leakage current of the insulation resistor.
However, at present, since the basin-type insulator is a main insulation voltage bearing part for bearing the GIS equipment and needs to be integrally cast, the measurement of the leakage current of the basin-type insulator is always regarded as an important parameter for evaluating the performance of the insulation material. However, due to a plurality of leakage current influence factors, the leakage current values of insulators made of different insulating materials are often different, the measured value is generally between microampere and milliampere, the dielectric loss factor is more than 5% -20%, the collected leakage current signal is extremely weak, the service life evaluation of the GIS insulator by using the leakage current needs to detect the leakage current change for a long time, and the transverse and longitudinal comparison has the significance of field practice.
At present, the common leakage current measurement is temporary measurement by offline equipment. Or on-line equipment but needs external power supply, which causes great hidden danger to the overall safety of the GIS insulator. Therefore, a safe and reliable GIS basin insulator leakage current measuring system is needed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides the self-powered sensor capable of monitoring the leakage current inside the GIS basin-type insulator in real time, and solves the problems that the leakage current of the GIS basin-type insulator cannot be monitored on line and needs external power supply.
The technical scheme adopted by the invention for solving the technical problem is as follows:
the utility model provides a self-power GIS basin formula insulator leakage current detection sensor which characterized in that includes:
the shell is fixedly arranged on the outer ring wall of the GIS basin-type insulator;
the GIS basin-type insulator comprises an induced current energy-taking coil, an induced current energy-taking coil and a GIS device metal shell, wherein the induced current energy-taking coil is wound on the outer annular wall of the GIS basin-type insulator, one end of the induced current energy-taking coil is connected with the GIS device metal shell, and when a certain current flows in a primary conductor of the GIS basin-type insulator, a secondary current with a certain value is induced in the induced current energy-taking coil;
a leakage current sensor mounted within the housing, the leakage current sensor comprising: the device comprises a shielding electrode and a collecting electrode, wherein the shielding electrode and the collecting electrode are in a concentric circle shape, the collecting electrode is positioned at the central position, the shielding electrode is in an annular shape and surrounds the collecting electrode, the shielding electrode and the collecting electrode are mutually insulated and are closely mounted at the exposed part of the GIS basin-type insulator epoxy resin;
a signal processing unit mounted within the housing, the signal processing unit comprising: electric energy collection processing module, signal acquisition processing module, wireless serial communication module, electric energy collection processing module connects induced-current energy-taking coil's the other end, electric energy collection processing module connects signal acquisition processing module, signal acquisition processing module connects wireless serial communication module, wireless serial communication module connects electric energy collection processing module, wireless serial communication module wireless connection host computer, secondary current passes through electric energy collection processing module collection processing back, and the electric energy that obtains is signal acquisition processing module and wireless serial communication module energy supply.
Further, the electric energy collection processing module comprises: the GIS equipment energy-taking device comprises a TVS protective diode, a rectifier diode, a current-limiting resistor R1, a voltage-stabilizing capacitor C1, a DC-DC conversion module and an energy-storing voltage-stabilizing capacitor C2, wherein one end of an induced current energy-taking coil is connected with a GIS equipment metal shell, the other end of the induced current energy-taking coil is respectively connected with the TVS protective diode and the rectifier diode, the rectifier diode is connected with the voltage-stabilizing capacitor C1 and the current-limiting resistor R1, the voltage-stabilizing capacitor C1 and the current-limiting resistor R1 are connected with the DC-DC conversion module, and the DC-DC conversion module is connected with the energy-storing voltage-stabilizing capacitor C2.
Further, the signal acquisition processing module comprises: the device comprises a micro-current electrometer and a digital acquisition card, wherein the micro-current electrometer is connected with an acquisition electrode of a leakage current sensor, the digital acquisition card is connected with the micro-current electrometer, and the digital acquisition card is connected with a wireless serial port communication module.
Furthermore, the signal acquisition processing module further comprises a temperature acquisition module, and the temperature acquisition module is connected with the digital acquisition card.
Further, the leakage current sensor further includes a ground electrode.
Furthermore, the signal acquisition processing module and the wireless serial port communication module communicate according to the same communication protocol, signals acquired by the digital acquisition card are directly transmitted to the wireless serial port communication module, and header files are added in the serial port communication module and then transmitted to the upper computer.
The invention has the advantages and positive effects that:
1. the invention is mainly applied to stable and sustainable measurement of leakage current of the conventional GIS epoxy resin basin-type insulator, can measure the leakage current data and the implementation temperature of the GIS basin-type insulator in real time, and is uploaded to an upper computer in a wireless serial port mode, the upper computer further explains the measured data and draws a real-time leakage current waveform, so that an equipment operation and maintenance worker can conveniently observe the leakage current waveform of the GIS basin-type insulator in real time, a transformer substation intelligent monitoring system can conveniently monitor and analyze the health condition of equipment, a leakage current database with faults or reduced insulation performance can be arranged on the upper computer, the current health condition of the equipment can be determined by comparing the real-time measured data of the GIS basin-type insulator, or the current health condition of the equipment can be determined by longitudinally comparing the same GIS basin-type insulator, the horizontal comparison can be performed on the same batch of basin-type insulators, so as to more accurately judge the running health condition of the equipment and evaluate the running life of the GIS equipment.
2. The invention is self-powered, adopts the serial port wireless communication module, does not need construction and wiring, can greatly save materials and labor cost, is very convenient to install and implement, and does not need to carry out a large amount of complex secondary wiring in a transformer substation.
3. Simple structure, stable performance, and can work in the superstrong electromagnetic environment for a long time.
Drawings
FIG. 1 is a schematic view of the installation of the sensor of the present invention on a GIS basin insulator;
FIG. 2 is a block diagram of the circuit of the present invention;
FIG. 3 is a schematic diagram of a leakage current sensor;
fig. 4 is a circuit diagram of the electric energy collecting and processing module.
Labeled as:
1 is an induced current energy-taking coil, 2 is a GIS basin-type insulator, 3 is a primary conductor, 4 is a leakage current sensor, 401 is a collecting electrode, 402 is a shielding electrode, 403 is a ground level, 5 is a shell and 6 is a signal processing unit.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
As shown in fig. 1, the self-powered GIS basin insulator leakage current detection sensor provided by the invention is installed on a conventional epoxy basin insulator. The method comprises the following steps: the GIS basin-type insulator comprises a shell 5, an induced current energy-taking coil 1, a leakage current sensor 4 and a signal processing unit 6, wherein the shell 5 is fixedly arranged on the outer ring wall of the GIS basin-type insulator 2, and the leakage current sensor 4 and the signal processing unit 6 are arranged in the shell 5.
The housing 5 only serves as a housing for the signal processing unit 6 and the leakage current sensor 4, and the housing 5 is directly connected with the metal housing of the GIS device, so that the signal processing unit 6 is ensured to be in a relatively good electromagnetic environment.
The induced current energy-taking coil 1 is wound on the outer edge of the GIS basin-type insulator 2, one end of the induced current energy-taking coil is in direct contact with a GIS equipment metal shell, namely, the GIS equipment metal shell is used as the ground potential, and the other end of the induced current energy-taking coil is connected with the electric energy acquisition module.
The leakage current sensor 4 is closely mounted on the GIS basin-type insulator 2, and a leakage current signal is measured from a pouring hole of the GIS basin-type insulator 2 or the outer edge of the GIS basin-type insulator which is not coated by metal.
As shown in fig. 3, the leakage current sensor 4 includes: the GIS basin-type insulator 2 comprises a ground electrode 403, a shielding electrode 402 and a collecting electrode 401, wherein the shielding electrode 402 and the collecting electrode 401 are in a concentric circle shape, the collecting electrode 401 is located at the center position, the shielding electrode 402 is in an annular shape and surrounds the collecting electrode 401, the shielding electrode 402 and the collecting electrode 401 are insulated from each other, and the shielding electrode 402 and the collecting electrode are closely attached to the exposed part of epoxy resin of the GIS basin-type insulator 2.
The signal processing unit 6 includes: the device comprises an electric energy acquisition and processing module, a signal acquisition and processing module and a wireless serial communication module, wherein the electric energy acquisition and processing module is connected with an induced current energy taking coil 1, the electric energy acquisition and processing module is connected with the signal acquisition and processing module, the signal acquisition and processing module is connected with the wireless serial communication module, and the wireless serial communication module is connected with the electric energy acquisition and processing module. Wherein wireless serial port communication module is the only mode of this sensor and host computer communication, and signal processing unit 6 is whole to be installed inside shell 5.
As shown in fig. 4, the electric energy collection processing module includes: the device comprises a TVS protection diode, a rectifier diode, a current limiting resistor R1, a voltage stabilizing capacitor C1, a DC-DC conversion module and an energy storage voltage stabilizing capacitor C2, wherein one end of the induced current energy-taking coil 1 is connected with a GIS equipment metal shell, the other end of the induced current energy-taking coil is respectively connected with the TVS protection diode and the rectifier diode, the rectifier diode is connected with the voltage stabilizing capacitor C1 and the current limiting resistor R1, the voltage stabilizing capacitor C1 and the current limiting resistor R1 are connected with the DC-DC conversion module, and the DC-DC conversion module is connected with the energy storage voltage stabilizing capacitor C2.
The signal acquisition processing module includes: the device comprises a micro-current electrometer, a digital acquisition card and a temperature acquisition module, wherein the micro-current electrometer is connected with an acquisition electrode 401 of a leakage current sensor 4, the digital acquisition card is respectively connected with the micro-current electrometer and the temperature acquisition module, and the digital acquisition card is connected with the wireless serial port communication module.
The signal acquisition processing module and the wireless serial port communication module are communicated according to the same communication protocol, signals acquired by the digital acquisition card are directly transmitted to the wireless serial port communication module, header files are added in the serial port communication module and then transmitted to an upper computer, and the upper computer is used for releasing current values acquired by the microcurrent electrometer and temperature values during measurement.
The self-powered GIS basin-type insulator leakage current detection sensor has the following working modes: when a certain current flows in the primary conductor 3 of the single-phase GIS basin-type insulator 2, a secondary current with a certain value is induced in the induced current energy-taking coil 1, the secondary current passes through the electric energy collecting and processing module, after collecting and processing, stable electric energy is obtained and stored in the energy storage voltage stabilizing capacitor C2, and the voltage of the energy storage voltage stabilizing capacitor C2 is kept at about 3.3V. The energy storage voltage stabilization capacitor C2 supplies energy to the micro-current electrometer, the digital acquisition card and the wireless serial port communication module.
When sufficient electric energy is stored in the energy storage and voltage stabilization capacitor C2, that is, the voltage is kept at about 3.3V, the signal processing unit 6 starts to work.
The working mode of the self-powered GIS basin-type insulator leakage current detection sensor during signal acquisition is as follows: the micro-current electrometer can collect micro current of 0.1pA-1 mA. When the GIS basin-type insulator 2 works normally, a tiny current at nA level exists between the leakage current sensor 4 and a metal shell of ground potential GIS equipment (when the insulation condition of the equipment is good, the current is at pA level), the micro-current electrometer can pass through the tiny current in real time, and the current can be converted into a digital signal at any time through a digital acquisition card. The wireless serial port communication module calls information in the digital acquisition card at a certain time interval (such as 15S), calls temperature information at the same time, transmits the information outwards in a transparent mode after calling related information, and transmits the information to an upper computer, namely, realizes acquisition of leakage current and temperature.
The signal acquisition processing module mainly acquires signals of the acquisition electrode 401 of the leakage current sensor 4, and eliminates the influence of surface current acquired by the shielding electrode 402. That is, the leakage current detection sensor mainly detects the leakage current in the GIS basin-type insulator 2, and the current is used as an important index of the aging degree of the epoxy resin of the GIS basin-type insulator 2.
Considering that the leakage current is sensitive to temperature change, when the leakage current is detected, the temperature value of the acquisition point is recorded at the same time for correcting the subsequent leakage current and calculating the aging degree of the GIS basin-type insulator 2.
The working mode of the invention is as follows:
(1) When a certain current flows in the primary conductor 3 of the single-phase GIS basin-type insulator 2, a secondary current with a certain value is induced in the induced current energy-taking coil 1, the secondary current passes through the electric energy collecting and processing module, after collecting and processing, stable electric energy is obtained and stored in the energy storage voltage stabilizing capacitor C2, and the voltage of the energy storage voltage stabilizing capacitor C2 is kept at about 3.3V.
(2) The energy storage voltage stabilization capacitor C2 supplies energy to the micro-current electrometer, the digital acquisition card and the wireless serial port communication module, and the signal processing unit 6 starts to work.
(3) The micro-current electrometer collects the nA level micro current measured by the leakage current sensor 4, and the current can be converted into a digital signal at any time through a digital acquisition card.
(4) The wireless serial port communication module calls information in the digital acquisition card at a certain time interval (such as 15S), simultaneously calls temperature information, adds header files to the called related information, and transmits the information outwards in a transparent transmission mode.
(5) After the signal sent by the invention is detected by an upper computer arranged in the transformer substation, the signal is decoded according to a transmission protocol, and analysis of the leakage current in the GIS basin-type insulator and real-time temperature acquisition are realized.
(6) The upper computer analyzes the measured data, real-time leakage current waveforms are drawn, equipment operation and maintenance personnel can observe the leakage current waveforms of the GIS basin-type insulators in real time, meanwhile, the intelligent monitoring system of the transformer substation monitors and analyzes the health condition of the equipment, a leakage current database with faults or reduced insulation performance can be arranged on the upper computer, the current health condition of the equipment can be determined by comparing the real-time measurement data of the GIS basin-type insulators, or longitudinal comparison is carried out on the same GIS basin-type insulator, transverse comparison is carried out on the same batch of basin-type insulators, the running health condition of the equipment can be judged more accurately, and the service life of the GIS equipment is evaluated.
The invention completely meets the requirements of the national grid company electric power safety work regulation power transformation part through laboratory tests and can be applied on site.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept, and these changes and modifications are all within the scope of the present invention.
Claims (6)
1. The utility model provides a self-energized GIS basin formula insulator leakage current detection sensor which characterized in that includes:
the shell (5) and the shell (5) are fixedly arranged on the outer annular wall of the GIS basin-type insulator (2);
the GIS basin-type insulator comprises an induced current energy-taking coil (1), wherein the induced current energy-taking coil (1) is wound on the outer annular wall of the GIS basin-type insulator (2), one end of the induced current energy-taking coil (1) is connected with a metal shell of GIS equipment, and when current flows in a primary conductor (3) of the GIS basin-type insulator (2), secondary current is induced in the induced current energy-taking coil (1);
-a leakage current sensor (4), -the leakage current sensor (4) being mounted within the housing (5), -the leakage current sensor (4) comprising: the GIS basin-type insulator comprises a shielding electrode (402) and a collecting electrode (401), wherein the shielding electrode (402) and the collecting electrode (401) are in a concentric circle shape, the collecting electrode (401) is located at the central position, the shielding electrode (402) is in an annular shape and surrounds the collecting electrode (401), the shielding electrode (402) and the collecting electrode (401) are insulated from each other and are closely mounted at the exposed part of epoxy resin of the GIS basin-type insulator (2);
a signal processing unit (6), the signal processing unit (6) being mounted within the housing (5), the signal processing unit (6) comprising: electric energy collection processing module, signal acquisition processing module, wireless serial communication module, electric energy collection processing module connects the other end of induced-current energy-taking coil (1), electric energy collection processing module connects signal acquisition processing module, signal acquisition processing module connects wireless serial communication module, wireless serial communication module connects electric energy collection processing module, wireless serial communication module wireless connection goes up the host computer, and after secondary current passed through electric energy collection processing module collection processing, the electric energy that obtains was signal acquisition processing module and wireless serial communication module energy supply.
2. The self-powered GIS basin insulator leakage current detection sensor of claim 1, wherein said power acquisition and processing module comprises: the GIS energy-taking device comprises a TVS protective diode, a rectifier diode, a current-limiting resistor R1, a voltage-stabilizing capacitor C1, a DC-DC conversion module and an energy-storing voltage-stabilizing capacitor C2, wherein one end of an induced current energy-taking coil (1) is connected with a GIS equipment metal shell, the other end of the induced current energy-taking coil is respectively connected with the TVS protective diode and the rectifier diode, the rectifier diode is connected with the voltage-stabilizing capacitor C1 and the current-limiting resistor R1, the voltage-stabilizing capacitor C1 and the current-limiting resistor R1 are connected with the DC-DC conversion module, and the DC-DC conversion module is connected with the energy-storing voltage-stabilizing capacitor C2.
3. The self-powered GIS basin insulator leakage current detection sensor of claim 2, wherein said signal acquisition processing module comprises: the device comprises a micro-current electrometer and a digital acquisition card, wherein the micro-current electrometer is connected with an acquisition electrode (401) of a leakage current sensor (4), the digital acquisition card is connected with the micro-current electrometer, and the digital acquisition card is connected with a wireless serial port communication module.
4. The self-powered GIS basin insulator leakage current detection sensor according to claim 3, wherein said signal acquisition processing module further comprises a temperature acquisition module, said temperature acquisition module being connected to said digital acquisition card.
5. The self-powered GIS basin insulator leakage current detection sensor according to claim 1, wherein the leakage current sensor (4) further comprises a ground electrode (403).
6. The self-powered GIS basin-type insulator leakage current detection sensor according to claim 1, wherein the signal acquisition processing module communicates with the wireless serial communication module according to the same communication protocol, and the signal acquired by the digital acquisition card is directly transmitted to the wireless serial communication module and is transmitted to the host computer after a header file is added in the serial communication module.
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| CN104422480A (en) * | 2013-08-28 | 2015-03-18 | 国家电网公司 | Power transmission line online monitoring circuit and intelligent insulator suspension ring |
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| CN112067851A (en) * | 2020-09-09 | 2020-12-11 | 四川大学 | Method for quantitatively measuring electric field force applied to organic polymer chain under action of electric field |
| CN115032512A (en) * | 2022-08-15 | 2022-09-09 | 国网天津市电力公司电力科学研究院 | GIS basin-type insulator on-line detection sensor |
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- 2022-12-29 CN CN202211703209.5A patent/CN115656878A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104422480A (en) * | 2013-08-28 | 2015-03-18 | 国家电网公司 | Power transmission line online monitoring circuit and intelligent insulator suspension ring |
| CN107068365A (en) * | 2016-09-29 | 2017-08-18 | 国家电网公司 | A kind of method of built-in transformer current-limiting apparatus and limiting transformer short circuit |
| CN206585398U (en) * | 2017-03-20 | 2017-10-24 | 三峡大学 | A kind of distribution line anchor support high pressure phase lead loop energy taking device |
| CN112067851A (en) * | 2020-09-09 | 2020-12-11 | 四川大学 | Method for quantitatively measuring electric field force applied to organic polymer chain under action of electric field |
| CN115032512A (en) * | 2022-08-15 | 2022-09-09 | 国网天津市电力公司电力科学研究院 | GIS basin-type insulator on-line detection sensor |
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Application publication date: 20230131 |