CN111722066A - Method for testing partial discharge initial voltage of environment-friendly gas insulation medium - Google Patents
Method for testing partial discharge initial voltage of environment-friendly gas insulation medium Download PDFInfo
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- CN111722066A CN111722066A CN202010507164.9A CN202010507164A CN111722066A CN 111722066 A CN111722066 A CN 111722066A CN 202010507164 A CN202010507164 A CN 202010507164A CN 111722066 A CN111722066 A CN 111722066A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1281—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of liquids or gases
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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Abstract
The invention discloses a method for testing the partial discharge starting voltage of an environment-friendly gas insulation medium. The invention comprises the following steps: cleaning the air chamber; testing the air tightness of the air chamber; carrying out gas washing treatment by using buffer gas; filling an environment-friendly gas insulation medium to be tested; connecting an electric loop, and applying a high-voltage alternating-current signal to the pin plate defect model in the air chamber by adopting a step-by-step boosting method; a partial discharge test was performed and the partial discharge onset voltage was recorded. The invention has the advantages that: the electric wiring is simple, the detection sensitivity is higher, partial discharge signal waveform is distinguished easily, and the degree of environmental protection gas insulation electrical equipment internal insulation defect is mastered to convenient fortune dimension maintainer, can provide the early warning for appearing in the environmental protection gas insulation electrical equipment insulating fault.
Description
Technical Field
The invention belongs to the technical field of on-line monitoring of insulation states of gas-insulated electrical equipment, and particularly relates to a method for testing partial discharge starting voltage of an environment-friendly gas-insulated medium.
Background
At present, SF6(sulfur hexafluoride) gas is most widely used in various gas-insulated electrical devices due to its excellent insulating properties and arc extinguishing ability. SF6The gas insulation equipment has the advantages of safe and reliable operation, convenient maintenance, small occupied area and the like. However, SF6The gas has strong greenhouse effect, the greenhouse effect caused by the mass application of the gas is more and more serious, certain harm is caused to the environment, and SF6The gas has strong stability, so that the harm can exist for a long time and seriously affects the atmospheric environment. From the long-term development perspective, the environmental-friendly insulating gas medium is urgently required to be searched for to replace SF6Gas is applied to electrical equipment to effectively slow down SF6Greenhouse effect caused by the application of a large amount of gas and the like.
At present, SF substitutes which are most concerned by scholars at home and abroad6The environment-friendly insulating gas medium is C4F7N (perfluoroisobutyronitrile) and mixed gas thereof. C4F7The N has excellent environmental protection and insulation properties, and has the defect that the liquefaction temperature is-4.7 ℃, the N cannot be directly applied to actual engineering and usually needs to be mixed with CO2、N2The mixed gas is mixed with the buffer gases such as air for use, so that the mixed gas has lower liquefaction temperature to meet the environmental temperature in the application of electrical equipment, and the mixed gas can normally work in the actual engineering.
In the gas insulation equipment, due to the influence of factors such as application and manufacturing, insulation defects exist inside the equipment, along with long-term operation of the equipment, devices inside the equipment are aged, the insulation defects are more prominent, and partial discharge begins to occur inside the equipment. Partial discharge is the initial manifestation of equipment failure caused by local overheating, electrical component aging in electrical equipment. If the electrical equipment continuously generates partial discharge under the operating voltage, the influence on the insulation characteristic of the equipment will accumulate day by day, and the influence caused by the partial discharge cannot be ignored at the moment. On one hand, strong electromagnetic steep pulses generated by partial discharge can damage an insulating material, so that the insulating property of the insulating material is reduced, a vicious circle is formed, and breakdown can be caused; on the other hand, partial discharges will initiate decomposition of the insulating gas medium to form decomposition products. The partial discharge is the most significant cause of accelerating the deterioration of insulation and is the most effective characteristic amount for characterizing the insulation state. The voltage applied when the insulating gas medium generates stable partial discharge is the partial discharge starting voltage, so that a method for testing the partial discharge starting voltage of the environment-friendly insulating gas medium is needed to be established in order to more reasonably, accurately and comprehensively reflect the partial discharge characteristics of the environment-friendly insulating gas medium.
Disclosure of Invention
The technical problem to be solved by the invention is to adopt an accurate and appropriate test method to obtain the Partial Discharge Initiation Voltage (PDIV) of the environment-friendly insulating gas medium mixed gas aiming at the background technology, and the difference of the Partial discharge characteristics of the environment-friendly insulating gas medium mixed gas with different proportions can be conveniently and accurately reflected according to the measured PDIV. .
The environment-friendly insulating gas medium has C in total4F7N/N2、C4F7N/CO2Two combination modes;
the electronegative gas is C4F7N；
Said C is4F7The name of N is perfluoro isobutyronitrile, the name of English is 2,3,3,3-tetrafluoro-2- (trifluoromethyl) -propanitrile, the molecular formula is (CF)3)2CFCN；
Preferably, the electronegative gas includes, but is not limited to, C with a purity of 100%4F7N, C containing a small amount of impurities but having a purity of more than 99%4F7N also belongs to electronegative gases referred to in the invention;
the buffer gas is N2Or CO2Either one of the two;
preferably, said N is2Including but not limited to N at 100% purity2N with a low content of impurities but a purity of more than 99.99%2Also belong to N as referred to in the present invention2；
Preferably, the CO is2Including but not limited to CO with a purity of 100%2CO with a low content of impurities but a purity of more than 99.99%2Also belong to the CO referred to in the present invention2；
The gas chamber does not have the reaction between an environment-friendly insulating gas medium and the material of the inner wall of the gas chamber, and can meet the compatibility requirement;
the technical scheme adopted by the invention is a system for testing the partial discharge starting voltage of an environment-friendly gas insulation medium, which comprises the following steps: the device comprises a voltage regulator, a protective resistor, a capacitive voltage divider, a voltmeter, a coupling capacitor, an air chamber, a detection resistor and an oscilloscope;
the voltage regulator is connected with the protection resistor; the protection resistor is respectively connected with the capacitive voltage divider, the coupling capacitor and the air chamber in sequence; the capacitive voltage divider is connected in parallel with the coupling capacitor; after the air chamber is connected with the detection resistor, the air chamber is further connected with the coupling capacitor in parallel; the detection resistor is connected with the oscilloscope in parallel;
the voltage regulator is used for regulating the alternating current signal through a certain transformer turn ratio to obtain a high-voltage alternating current signal;
the protective resistor is used for preventing the transformer in the voltage regulator from overflowing at the moment of breakdown of the insulating gas medium;
the capacitive voltage divider converts the high voltage AC signal output by the voltage regulator into a low voltage AC signal that can be measured by the voltmeter;
the voltmeter is used for measuring the actual voltage applied to two ends of the discharge defect in the gas chamber;
the coupling capacitor filters low-frequency signals and direct-current signals in the pulse current generated by partial discharge of the pin plate electrode in the gas chamber to obtain filtered pulse current,
the detection resistor converts the filtered pulse current into a pulse voltage signal;
the oscilloscope is used for displaying pulse voltage signals;
the air chamber is the airtight container that flange joint made for fill the gas insulation medium of environmental protection, includes: the device comprises a tank body, an insulating sleeve, a conducting rod, a needle plate defect model, an inlet and outlet valve and a precision barometer;
more specifically, the tank body is made of stainless steel, and is fixedly connected in a flange connection mode through threads;
the insulation sleeve is positioned at the upper part of the tank body and is made of polytetrafluoroethylene with excellent corrosion resistance;
the conductive rod is made of brass and is positioned in the tank body, one end of a high-voltage end of the conductive rod is connected with a series point of the protective resistor and the voltage-dividing capacitor, the other end of the high-voltage end of the conductive rod is connected with a pin electrode of the pin plate defect model through threads, one end of a grounding end of the conductive rod is connected with the plate electrode of the pin plate defect model, and the other end of the grounding end of the conductive rod is connected with the ground;
the pin plate defect model is made of brass and is positioned in the tank body, the upper end of a pin electrode of the pin plate defect model is provided with an internal threaded hole and is fixedly connected with the high-voltage end of the conducting rod by adopting fixed threads, and the lower end of a plate electrode of the pin plate defect model is provided with an internal threaded hole and is fixedly connected with the grounding end of the conducting rod by threads;
the inlet and outlet valve is made of stainless steel, is positioned outside the tank body, is fixedly connected with the tank body through threads, and is used for charging and discharging the environment-friendly gas insulating medium and the buffer gas;
the precise barometer is positioned outside the tank body, is fixedly connected with the tank body through threads and is used for detecting the air pressure of the environment-friendly gas insulation medium in the air chamber;
the technical scheme of the method is that the method for testing the partial discharge starting voltage of the environment-friendly gas insulation medium specifically comprises the following steps:
step 1: and (3) cleaning the inner wall of the tank body of the air chamber and the defect model of the needle plate by using absolute ethyl alcohol to remove impurities in the air chamber.
Step 2: an inlet valve and an outlet valve of the air chamber are connected with a vacuum pump, the vacuum pump is started, the air chamber is vacuumized, and the air chamber is kept stand for a certain time; if the air inlet phenomenon does not occur, the air tightness is good, and then the next step is prepared for working; if the air inlet phenomenon occurs, the air chamber is proved to have air leakage, the reason of the air leakage needs to be checked, and the air chamber tightness is detected again until the air tightness meets the requirement.
And step 3: the inlet and outlet valves of the air chamber are connected with a vacuum pump, the vacuum pump is started, after the air chamber is vacuumized, the inlet and outlet valves of the air chamber are connected with a buffer gas cylinder, and a proper amount of buffer gas is introduced;
and 4, step 4: and (5) after the step 3 is repeatedly executed for a plurality of times, vacuumizing the air chamber.
And 5: and the inlet and outlet valve of the gas chamber is connected with a gas insulation medium gas cylinder, a certain proportion of environment-friendly gas insulation medium is introduced, then the inlet and outlet valve of the gas chamber is connected with a buffer gas cylinder, a certain amount of buffer gas is introduced, and the gas chamber is kept stand for a certain time.
Step 6: and opening a voltage regulator, connecting an electric loop, applying a high-voltage alternating current signal to a needle plate defect model in the air chamber by adopting a step-by-step boosting method, enabling free charges in the environment-friendly gas insulation medium to move by the high-voltage alternating current signals at two ends of the needle plate defect model, generating a pulse current signal in a loop formed by the coupling capacitor, the air chamber and the detection resistor, converting the pulse current signal into a pulse voltage signal through the detection resistor, displaying the pulse voltage signal in the oscilloscope, and recording the indication number of the voltmeter to be the local discharge starting voltage when the oscilloscope observes that a stable periodic attenuation oscillation signal appears in the negative half cycle of the power frequency alternating current signal.
The invention has the advantages that: the electric wiring is simple, the detection sensitivity is higher, partial discharge signal waveform is distinguished easily, and the degree of environmental protection gas insulation electrical equipment internal insulation defect is mastered to convenient fortune dimension maintainer, can provide the early warning for appearing in the environmental protection gas insulation electrical equipment insulating fault.
Drawings
FIG. 1: the invention is a platform for testing PDIV of environment-friendly insulating gas medium under extremely non-uniform electric field;
FIG. 2: is a structure diagram of the air chamber;
FIG. 3: is a partial discharge signal waveform of an environment-friendly insulating gas medium;
1 is an insulating sleeve, 2 is a high-voltage end of a conducting rod, 3 is a grounding end of the conducting rod, 4 is a needle plate defect model, 5 is a tank body, 6 is a precision barometer, and 7 is an inlet and outlet valve;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The technical solution of the specific embodiment of the present invention is shown in fig. 1, and a system for testing the partial discharge starting voltage of an environment-friendly gas-insulated medium includes: the device comprises a voltage regulator, a protective resistor, a capacitive voltage divider, a voltmeter, a coupling capacitor, an air chamber, a detection resistor and an oscilloscope;
the voltage regulator is connected with the protection resistor; the protection resistor is respectively connected with the capacitive voltage divider, the coupling capacitor and the air chamber in sequence; the capacitive voltage divider is connected in parallel with the coupling capacitor; after the air chamber is connected with the detection resistor, the air chamber is further connected with the coupling capacitor in parallel; the detection resistor is connected with the oscilloscope in parallel;
the voltage regulator is used for regulating the alternating current signal through a certain transformer turn ratio to obtain a high-voltage alternating current signal, the input voltage of the voltage regulator is 380V, and the maximum output voltage is 100 kV;
the protective resistor is used for preventing the transformer in the voltage regulator from overflowing at the breakdown moment of the insulating gas medium, and the resistance value is 10k omega;
the capacitance divider converts a high-voltage alternating current signal output by the voltage regulator into a low-voltage alternating current signal which can be measured by the voltmeter, and the capacitance value of the capacitance divider is 500pF/500 nF;
the voltmeter is used for measuring the actual voltage applied to two ends of the discharge defect in the gas chamber;
the coupling capacitor filters low-frequency signals and direct-current signals in the pulse current generated by partial discharge of the pin plate electrode in the gas chamber to obtain the filtered pulse current, and the capacitance value is 1000 pF;
the detection resistor converts the filtered pulse current into a pulse voltage signal with the resistance value of 50 omega;
the oscilloscope is used for displaying pulse voltage signals, the model of the oscilloscope is Tek DPO7104, the number of acquisition channels is 4, the analog bandwidth is 1GHz, the sampling rate is 20GS/s, the A/D conversion precision is 8 bits, and the storage depth is 48M;
the air chamber is the airtight container that flange joint made for fill the gas insulation medium of environmental protection, includes: the device comprises a tank body, an insulating sleeve, a conducting rod, a needle plate defect model, an inlet and outlet valve and a precision barometer;
more specifically, the tank body is made of stainless steel, and is fixedly connected in a flange connection mode through threads;
the insulation sleeve is positioned at the upper part of the tank body and is made of polytetrafluoroethylene with excellent corrosion resistance;
the conductive rod is made of brass and is positioned in the tank body, one end of a high-voltage end of the conductive rod is connected with a series point of the protective resistor and the voltage-dividing capacitor, the other end of the high-voltage end of the conductive rod is connected with a pin electrode of the pin plate defect model through threads, one end of a grounding end of the conductive rod is connected with the plate electrode of the pin plate defect model, and the other end of the grounding end of the conductive rod is connected with the ground;
the pin plate defect model is made of brass and is positioned in the tank body, the upper end of a pin electrode of the pin plate defect model is provided with an internal threaded hole and is fixedly connected with the high-voltage end of the conducting rod by adopting fixed threads, and the lower end of a plate electrode of the pin plate defect model is provided with an internal threaded hole and is fixedly connected with the grounding end of the conducting rod by threads;
the inlet and outlet valve is made of stainless steel, is positioned outside the tank body, is fixedly connected with the tank body through threads, and is used for controlling the charging and discharging of the environment-friendly gas insulating medium and the buffer gas;
the precise barometer is positioned outside the tank body, is fixedly connected with the tank body through threads and is used for detecting the air pressure of the environment-friendly gas insulation medium in the air chamber, and the indicating number range of the air pressure is-0.1 MPa-0.7 MPa;
the environment-friendly insulating gas medium has C in total4F7N/N2、C4F7N/CO2Two combination modes;
the electronegative gas is C4F7N；
Said C is4F7The name of N is perfluoro isobutyronitrile, the name of English is 2,3,3,3-tetrafluoro-2- (trifluoromethyl) -propanitrile, the molecular formula is (CF)3)2CFCN；
The electronegative gas includes, but is not limited to, C with a purity of 100%4F7N, C containing a small amount of impurities but having a purity of more than 99%4F7N also belongs to electronegative gases referred to in the invention;
the buffer gas is N2Or CO2Either one of the two;
said N is2Including but not limited to N at 100% purity2N with a low content of impurities but a purity of more than 99.99%2Also belong to N as referred to in the present invention2；
The CO is2Including but not limited to CO with a purity of 100%2CO with a low content of impurities but a purity of more than 99.99%2Also belong to the CO referred to in the present invention2；
The gas chamber does not have the phenomenon that an environment-friendly insulating gas medium reacts with the material of the inner wall of the gas chamber tank body, and can meet the compatibility requirement;
the technical scheme of the method is that the method for testing the partial discharge starting voltage of the environment-friendly gas insulation medium specifically comprises the following steps:
step 1: and (3) cleaning the inner wall of the tank body of the air chamber and the defect model of the needle plate by using absolute ethyl alcohol to remove impurities in the air chamber.
Before the test is started, the inner wall of the air chamber tank body is wiped clean by absolute ethyl alcohol, and meanwhile, the pin plate defect model is wiped clean, so that the influence of external factors such as the surface of the pin plate defect model, dirt on the inner wall of the tank body, particles and moisture on the test accuracy is reduced.
Step 2: and the inlet and outlet valves of the air chamber are connected with a vacuum pump, the vacuum pump is opened, the air chamber is vacuumized, and the air chamber is kept stand for 30 minutes. If the air inlet phenomenon does not occur, the air tightness is good, and then the next step is prepared for working; if the air inlet phenomenon occurs, the air chamber is proved to have air leakage, the reason of the air leakage needs to be checked, and the air chamber tightness is detected again until the air tightness meets the requirement.
The air chamber is connected with a vacuum pump through an inlet and outlet valve for vacuum pumping treatment, when the precision air pressure indicating number reaches 0.005MPa, the inlet and outlet valve of the air chamber is closed, the vacuum pump is closed, the air chamber is kept stand for 30 minutes, and then the change of the precision air pressure indicating number is observed. If the precision air pressure indicating number does not change obviously, the air tightness is good, and then the next step is prepared for work; if the precise air pressure indicating number has obvious change, the air chamber is proved to have air leakage, the reason of the air leakage needs to be checked, and then the air tightness detection is carried out again until the air tightness meets the requirement.
And step 3: the inlet and outlet valves of the air chamber are connected with a vacuum pump, the vacuum pump is started, after the air chamber is vacuumized, the inlet and outlet valves of the air chamber are connected with a buffer gas cylinder, and a proper amount of buffer gas is introduced;
after the air chamber airtightness detection is completed, the buffer gas is used for gas washing treatment, so that the interference of impurity gas attached to the inner wall of the air chamber tank body on the test result is reduced. And introducing buffer gas into the gas chamber, when the precision gas pressure representation number reaches 0.3MPa, closing the buffer gas cylinder and the inlet and outlet valves in sequence, standing for 5 minutes, and then vacuumizing the gas chamber by using a vacuum pump.
And 4, step 4: and after the step is repeatedly executed for 3 times, vacuumizing the air chamber.
And 5: and the inlet and outlet valve of the gas chamber is connected with a gas insulation medium gas cylinder, a certain proportion of environment-friendly gas insulation medium is introduced, then the inlet and outlet valve of the gas chamber is connected with a buffer gas cylinder, a certain amount of buffer gas is introduced, and the gas chamber is kept stand for a certain time.
After the gas washing is finished, environment-friendly insulating gas medium (with the gas pressure of 0.6MPa, C) is filled in the gas chamber4F7N and CO2For example 6% and 94% by volume, respectively). The method comprises the following operation steps: the gas chamber is filled with an electronegative gas C4F7N gas cylinder connection, opening inlet and outlet valves, and slowly introducing C into the gas chamber4F7N gas, when the precision gas pressure indication number is 0.036MPa, sequentially closing the C4F7The N gas cylinder and the gas chamber inlet and outlet valves are connected, and then CO is introduced2The gas cylinder is connected with the gas chamber, the inlet and outlet valves are opened, and CO is slowly introduced into the gas chamber2Gas until the precise gas pressure indicating number is 0.6MPa, and finally, sequentially closing CO2The gas cylinder and the gas chamber inlet and outlet valve. Standing for 30 minutes to obtain a gas pressure of 0.6MPa and C4F7N and CO26 percent and 94 percent of environment-friendly insulating gas medium.
Step 6: opening a voltage regulator, connecting an electric loop, applying a high-voltage alternating current signal to a needle plate defect model in the air chamber by adopting a step-by-step boosting method, enabling free charges in the environment-friendly gas insulation medium to move by the high-voltage alternating current signals at two ends of the needle plate defect model, generating a pulse current signal in a loop formed by the coupling capacitor, the air chamber and the detection resistor, converting the pulse current signal into a pulse voltage signal through the detection resistor, displaying the pulse voltage signal in the oscilloscope, and recording the indication number of the voltmeter, namely checking the air chamber tightness when stable periodic attenuation oscillation signals appear in the negative half cycle of the power frequency alternating current signal on the oscilloscope
The PDIV of an environmentally-friendly gas medium under very non-uniform electric fields was tested using the platform shown in fig. 1. During the test, as the applied voltage increases, a partial discharge phenomenon occurs between the electrodes, and when a repetitive and distinct discharge signal occurs, as shown in fig. 3, the voltage at this time is recorded as the start voltage of the partial discharge, and the waveform at this time is recorded as the waveform at the start of the partial discharge. The test results of the specific embodiment of the invention are as follows:
specific examples example 1:
charging into the air chamberAdding 0.4MPa environment-friendly insulating gas medium, wherein the volume percentages of electronegative gases are respectively 0%, 2%, 4%, 6%, 8%, 10% and 12%, and then buffering gas CO2The volume ratio is 100%, 98%, 96%, 94%, 92%, 90% and 88%, and the PDIV of the above 7 groups of environment-friendly insulating gas media are tested to be 13.9kV, 14.8kV, 16.2kV, 20.2kV, 21.5kV, 22.9kV and 23.9kV respectively.
Specific example 2:
filling 0.6MPa environment-friendly insulating gas medium into the gas chamber, wherein the volume percentages of the electronegative gases are 0%, 2%, 4%, 6%, 8%, 10% and 12%, respectively, so that the buffer gas CO is2The volume ratio is 100%, 98%, 96%, 94%, 92%, 90% and 88%, and the PDIV of the above 7 groups of environment-friendly insulating gas media are tested to be 18.7kV, 21.4kV, 23.2kV, 25.3kV, 25.6kV, 26.7kV and 27.0kV respectively.
The test results of the above examples clearly show that according to the test method proposed by the present invention, partial discharge starting voltages of the environmentally friendly insulating gas medium can be obtained at different gas pressures and different volume ratios of the electronegative gas. The larger the gas pressure is, the larger the volume ratio of the electronegative gas is, the higher the PDIV value is. Therefore, the method provided by the invention can conveniently and accurately test the PDIV of the environment-friendly insulating gas medium, and evaluate the influence of the volume of the electronegative gas on the partial discharge characteristic of the environment-friendly insulating gas medium according to the size of the PDIV.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. A system for testing partial discharge inception voltage of an environmentally friendly gas-insulated medium, comprising: the device comprises a voltage regulator, a protective resistor, a capacitive voltage divider, a voltmeter, a coupling capacitor, an air chamber, a detection resistor and an oscilloscope;
the voltage regulator is connected with the protection resistor; the protection resistor is respectively connected with the capacitive voltage divider, the coupling capacitor and the air chamber in sequence; the capacitive voltage divider is connected in parallel with the coupling capacitor; after the air chamber is connected with the detection resistor, the air chamber is further connected with the coupling capacitor in parallel; the detection resistor is connected with the oscilloscope in parallel;
the voltage regulator is used for regulating the alternating current signal through a certain transformer turn ratio to obtain a high-voltage alternating current signal;
the protective resistor is used for preventing the transformer in the voltage regulator from overflowing at the moment of breakdown of the insulating gas medium;
the capacitive voltage divider converts the high voltage AC signal output by the voltage regulator into a low voltage AC signal that can be measured by the voltmeter;
the voltmeter is used for measuring the actual voltage applied to two ends of the discharge defect in the gas chamber;
the coupling capacitor filters low-frequency signals and direct-current signals in the pulse current generated by partial discharge of the pin plate electrode in the gas chamber to obtain filtered pulse current;
the detection resistor converts the filtered pulse current into a pulse voltage signal;
the oscilloscope is used for displaying pulse voltage signals;
the air chamber is a closed container made of flange connection and used for filling environment-friendly gas insulation media.
2. The system for testing partial discharge inception voltage of environmentally friendly gas insulating medium according to claim 1, wherein said gas chamber comprises: the device comprises a tank body, an insulating sleeve, a conducting rod, a needle plate defect model, an inlet and outlet valve and a precision barometer;
the tank body is made of stainless steel and is fixedly connected in a flange connection mode through threads;
the insulation sleeve is positioned at the upper part of the tank body and is made of polytetrafluoroethylene with excellent corrosion resistance;
the conductive rod is made of brass and is positioned in the tank body, one end of a high-voltage end of the conductive rod is connected with a series point of the protective resistor and the voltage-dividing capacitor, the other end of the high-voltage end of the conductive rod is connected with a pin electrode of the pin plate defect model through threads, one end of a grounding end of the conductive rod is connected with the plate electrode of the pin plate defect model, and the other end of the grounding end of the conductive rod is connected with the ground;
the pin plate defect model is made of brass and is positioned in the tank body, the upper end of a pin electrode of the pin plate defect model is provided with an internal threaded hole and is fixedly connected with the high-voltage end of the conducting rod by adopting fixed threads, and the lower end of a plate electrode of the pin plate defect model is provided with an internal threaded hole and is fixedly connected with the grounding end of the conducting rod by threads;
the inlet and outlet valve is made of stainless steel, is positioned outside the tank body, is fixedly connected with the tank body through threads, and is used for charging and discharging the environment-friendly gas insulating medium and the buffer gas;
the precise barometer is positioned outside the tank body, is fixedly connected with the tank body through threads and is used for detecting the air pressure of the environment-friendly gas insulation medium in the air chamber.
3. A method for testing the partial discharge inception voltage of environmentally friendly gas insulating medium according to the system for testing the partial discharge inception voltage of environmentally friendly gas insulating medium of claim 1, comprising the steps of:
step 1: cleaning the inner wall of the tank body of the air chamber and the defect model of the needle plate by using absolute ethyl alcohol to remove impurities in the air chamber;
step 2: an inlet valve and an outlet valve of the air chamber are connected with a vacuum pump, the vacuum pump is started, the air chamber is vacuumized, and the air chamber is kept stand for a certain time; if the air inlet phenomenon does not occur, the air tightness is good, and then the next step is prepared for working; if the air inlet phenomenon occurs, the air chamber is proved to have air leakage, the reason of the air leakage needs to be checked, and the air chamber tightness is detected again until the air tightness meets the requirement;
and step 3: the inlet and outlet valves of the air chamber are connected with a vacuum pump, the vacuum pump is started, after the air chamber is vacuumized, the inlet and outlet valves of the air chamber are connected with a buffer gas cylinder, and a proper amount of buffer gas is introduced;
and 4, step 4: after the step 3 is repeatedly executed for a plurality of times, vacuumizing the air chamber;
and 5: the inlet and outlet valves of the gas chamber are connected with a gas insulation medium gas cylinder, a certain proportion of environment-friendly gas insulation medium is introduced, then the inlet and outlet valves of the gas chamber are connected with a buffer gas cylinder, a certain amount of buffer gas is introduced, and the gas chamber is kept stand for a certain time;
step 6: and opening a voltage regulator, connecting an electric loop, applying a high-voltage alternating current signal to a needle plate defect model in the air chamber by adopting a step-by-step boosting method, enabling free charges in the environment-friendly gas insulation medium to move by the high-voltage alternating current signals at two ends of the needle plate defect model, generating a pulse current signal in a loop formed by the coupling capacitor, the air chamber and the detection resistor, converting the pulse current signal into a pulse voltage signal through the detection resistor, displaying the pulse voltage signal in the oscilloscope, and recording the indication number of the voltmeter to be the local discharge starting voltage when the oscilloscope observes that a stable periodic attenuation oscillation signal appears in the negative half cycle of the power frequency alternating current signal.
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| CN202010507164.9A CN111722066A (en) | 2020-06-05 | 2020-06-05 | Method for testing partial discharge initial voltage of environment-friendly gas insulation medium |
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| CN202010507164.9A CN111722066A (en) | 2020-06-05 | 2020-06-05 | Method for testing partial discharge initial voltage of environment-friendly gas insulation medium |
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| CN112595942A (en) * | 2020-12-26 | 2021-04-02 | 广东电网有限责任公司电力科学研究院 | Gas insulation performance test system and method |
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