CN114184913A - C5F10O-mixed gas electrical insulation characteristic test method - Google Patents
C5F10O-mixed gas electrical insulation characteristic test method Download PDFInfo
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- 238000010292 electrical insulation Methods 0.000 title claims abstract description 17
- 238000010998 test method Methods 0.000 title claims description 14
- 238000012360 testing method Methods 0.000 claims abstract description 76
- 230000015556 catabolic process Effects 0.000 claims abstract description 75
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000004140 cleaning Methods 0.000 claims description 28
- 239000012535 impurity Substances 0.000 claims description 16
- 238000002360 preparation method Methods 0.000 claims description 15
- 238000002474 experimental method Methods 0.000 claims description 13
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 9
- 230000003247 decreasing effect Effects 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 230000032683 aging Effects 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 238000011068 loading method Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 230000007547 defect Effects 0.000 claims description 4
- 238000011049 filling Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 229910001369 Brass Inorganic materials 0.000 claims description 3
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 229920000742 Cotton Polymers 0.000 claims description 3
- 238000007605 air drying Methods 0.000 claims description 3
- 239000010951 brass Substances 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 235000019441 ethanol Nutrition 0.000 claims description 3
- 238000013100 final test Methods 0.000 claims description 3
- 239000012025 fluorinating agent Substances 0.000 claims description 3
- 238000002290 gas chromatography-mass spectrometry Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000009863 impact test Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000002985 plastic film Substances 0.000 claims description 3
- 229920006255 plastic film Polymers 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 abstract description 8
- 239000007789 gas Substances 0.000 description 102
- 229910018503 SF6 Inorganic materials 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000010964 304L stainless steel Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
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- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
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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
Abstract
The invention relates to the technical field of electric power, in particular to a power supply C5F10Testing method for electrical insulation property of O-mixed gas by using different test platforms5F10And (4) carrying out a mixed gas insulation characteristic test on the O mixed gas, and finally obtaining accurate test data. Aiming at the C pair through a power frequency breakdown test platform, a lightning impulse test platform and an impulse withstand voltage test platform5F10The insulation characteristics of O-mixed gas were tested and C was determined by this method5F10The precise insulating property of the O mixed gas has guiding significance for engineering application.
Description
Technical Field
The invention belongs to the technical field of electric powerAnd in particular to C5F10O-gas mixture electrical insulation characteristic test method.
Background
The gas-insulating medium does not age and can be used almost indefinitely. Sulfur hexafluoride (SF)6) Since the middle of the last century, gas, which is one of gas-insulated media, has been widely used for SF of metal-enclosed switchgear, gas-insulated line, gas-insulated switchgear, etc., due to its outstanding insulating properties, good arc-extinguishing properties, non-toxicity, etc6SF for high-voltage switchgear in insulating systems6The gas consumption accounts for more than 80% of the total gas consumption of the power industry, the gas consumption of the medium-voltage switchgear accounts for 10%, and the medium-voltage SF6The number of insulated electrical devices is increasing year by year.
To solve the problem of SF6Greenhouse effect problem caused by gas, SF6Research on alternative gases has led to some positive results, e.g. containing small amounts of SF6SF of gas6-N2The mixed gas is successfully applied to equipment such as a gas insulated transformer, a gas insulated pipeline and the like, and other SF is researched6Mixed gas, dry air, etc. But for C5F10The research on the insulating property of the O-mixed gas is not sufficient, and particularly, the research on the power frequency breakdown characteristic, the lightning impulse characteristic and the operation impulse characteristic of the mixed gas is rarely reported.
Disclosure of Invention
In order to solve the above problems, the present invention provides C5F10The method for testing the electrical insulation characteristic of the O-mixed gas comprises the step of testing the C-mixed gas through a power frequency breakdown test platform, a lightning impulse test platform and an impulse withstand voltage test platform5F10The insulation characteristics of O-mixed gas were tested and C was determined by this method5F10The precise insulating property of the O mixed gas has guiding significance for engineering application.
The technical scheme adopted by the invention is as follows: c5F10The test method for the electrical insulation characteristic of the O-mixed gas comprises the following steps:
s1: to C5F10Performing a power frequency breakdown test on the O mixed gas; cleaning preparation work before testing is carried out, a power frequency breakdown testing platform is utilized, a gradual pressurization method is adopted to apply power frequency voltage to a discharge air chamber on the power frequency breakdown testing platform, the average value of breakdown voltage after ten times of pressurization breakdown under the same condition is taken as a final testing result, and pressurization is carried out again after 5min interval after each breakdown;
s2: to C5F10Carrying out lightning impulse test on the O mixed gas; cleaning preparation work before the test is done, standard lightning impulse voltage is applied to the mixed gas by using a lightning impulse test platform, and 50% impulse breakdown voltage U of the mixed gas is obtained by a lifting method50％；
S3: to C5F10Carrying out an operation impact test on the O mixed gas; cleaning preparation work before testing is done, impact voltage is applied to the mixed gas by using an impact voltage-withstanding test platform, and 50% impact breakdown voltage U of the mixed gas is obtained by a lifting method50％。
Preferably, in step S1, the step-by-step pressurizing method specifically comprises the following steps: firstly, the breakdown voltage in the discharge chamber is estimated, the experimental voltage starts to be boosted from 0kV, the boosting step length is 2kV, the boosting time interval is 30s, when the applied voltage reaches 80% of the estimated value, the boosting step length is changed to 0.5kV, 1min is waited after boosting is finished each time, if the air gap in 1min is not broken down, the voltage is continuously boosted, and 1min is waited after boosting is finished each time until the air gap is broken down.
Preferably, the cleaning preparation work in step S1 specifically includes:
s1.1: cleaning equipment; before the test is started, absorbent cotton is dipped in absolute ethyl alcohol, a discharge air chamber and an electrode in the air chamber are wiped clean, and dirt, particles and the like in the air chamber and on the electrode are removed to eliminate factors which may influence the test; air-drying the discharge gas chamber and the electrode in a dry and clean environment, and removing the absolute ethyl alcohol; the electrodes used in the experiment are arranged on the conducting rod by wearing dust-free rubber gloves with both hands, and the electrode spacing is adjusted;
s1.2: detecting air tightness; vacuumizing the discharge air chamber by using a vacuum pump, monitoring the air pressure in the discharge air chamber by using a high-precision digital display barometer, and continuously vacuumizing for 30 minutes when the air pressure display number reaches-100.867 kPa; standing for 30min, reading the air pressure representation number to be recorded as A, continuously standing for 5h, reading the air pressure representation number to be recorded as B, if B-A is less than or equal to 0.067kPa, indicating that the air chamber is good in air tightness in a vacuum state, otherwise, carrying out air tightness leakage detection on the device; filling 0.5MPa of buffer gas into the air chamber with detected air tightness, wrapping the sealed joint of the discharge air chamber by using a plastic film by adopting a local wrapping method, observing whether the wrapped film is bulged or not after 24 hours, if not, indicating that the air chamber is good in air tightness under a high-pressure state, otherwise, carrying out air tightness leakage detection on the device;
s1.3: washing gas; cleaning the gas chamber by using buffer gas to remove impurity gas in the gas chamber;
s1.4: and (3) inflating: connecting experimental ventilation pipeline, vacuumizing the experimental pipeline, and heating to fill liquid C5F10Vials of O fluorinating agent C5F10Vaporizing O, injecting into experimental discharge gas chamber, observing precise digital barometer, stopping injection when the indicated pressure is required, standing for a period of time, and sealing gas chamber C in the experimental chamber5F10The O gas is sufficiently diffused, and if the reading number is decreased, the C injection is continued5F10O until the pressure is stabilized at the required pressure; then filling buffer gas, waiting for buffer gas and C5F10Mixing the O gas uniformly, and controlling the gas pressure to carry out a breakdown experiment under different gas pressure grades; standing for at least 24h after each time of inflation;
s1.5: detecting impurities; collecting a small amount of mixed gas after each inflation is finished, detecting by using GC/MS, and if other components are found in the gas, extracting C5F10Mixing gas O, and completing the steps S1.1-S1.4 again.
Preferably, the specific operation of step S1.3 is: firstly, introducing buffer gas into the discharge gas chamber to enable positive pressure to appear in the discharge gas chamber, standing for 10 minutes, then pumping the gas chamber to vacuum by using a vacuum pump, and repeating the operations of introducing the buffer gas and pumping the vacuum for three times to ensure that no other impurity gas exists in the gas chamber.
Preferably, in step S2, the specific operation of the lifting method is: predicting 50% breakdown voltage U1 of electrode gap in discharge gas chamber on impulse withstand voltage test platform0Taking the difference of grade delta U as 0.03U10In U10Loading as a preliminary test voltage; if the gap is not broken down, the next applied voltage should be increased by delta U, if the gap is broken down, the next applied voltage should be decreased by delta U, and the interval time between two adjacent discharges is not less than 3-5 minutes; the voltage is repeatedly applied for 20 times, and the voltage U1 of each stage is recordediNumber of pressing n1iCalculating a 50% lightning impulse discharge voltage value according to the following formula;
when the total number of times of applying the voltage in each group is recorded, if the voltage of the first applied amplitude value does not cause breakdown, counting is started from the discharge which firstly causes the breakdown of the air gap later; if the first application amplitude is U0Has caused breakdown, statistics are taken from the discharge that first did not cause air gap breakdown.
Preferably, the cleaning preparation work in step S2 specifically includes:
s2.1: a cleaning device; before each test, carefully cleaning the inner wall of the device and the artificial defect model by using alcohol, and removing impurities and dust in the electric chamber of the device;
s2.2: aging the electrode; before the breakdown experiment, the discharge aging experiment is carried out on the sample electrode sample for 20-30 times, micron-sized fine impurities suspended in a discharge gas chamber are eliminated, and the breakdown voltage data is read after the breakdown voltage is stable.
Preferably, in step S3, the specific operation of the lifting method is: predicting 50% breakdown voltage U2 of electrode gap in discharge gas chamber on impulse withstand voltage test platform0Taking the difference of grade delta U as 0.02U20In U20Loading as a preliminary test voltage; if the gap is not broken down, the next applied voltage should increase by Δ U, and if the gap is broken down, the next applied voltage should decrease by Δ UU, the interval time between two adjacent discharges is not less than 60 s; the voltage is repeatedly applied for 40 times, and the voltage U2 of each stage is recordediNumber of pressing n2iCalculating a 50% lightning impulse discharge voltage value according to the following formula;
when recording the total times of applying impulse voltage to each group, if the impulse voltage of the first applied amplitude value does not cause breakdown, counting is started from the discharge which firstly causes air gap breakdown later; if the first application amplitude is U20Has caused breakdown, statistics are taken from the discharge that first did not cause air gap breakdown afterwards.
Preferably, the electrode of the power frequency breakdown test platform in step S1 is a ball-ball electrode, the ball-ball electrode includes two ball electrodes, each ball electrode is connected to the high-voltage guide rod and the ground electrode guide rod, each ball electrode is detachable, and the length of the ground electrode guide rod is adjustable; the electrodes in the lightning impulse test platform and the impulse withstand voltage test platform in the steps S2 and S3 are all pin-plate electrodes, the pin-plate electrodes comprise column electrodes and plate electrodes, and the column electrodes are separated from the plate electrodes.
Preferably, the ball electrode is a brass ball electrode, the ball radius of the ball electrode is 25mm, an internal thread is adopted at the joint of the ball electrodes, the two ball electrodes are separated from each other, and the distance between the two ball electrodes is 2 mm; the diameter of a column electrode in the needle-plate electrode is 20mm, the edge chamfer radius is 3mm, the radius of curvature of a needle point is 65-70 mu m, and the material is carbon steel; the diameter of a plate electrode in the pin-plate electrodes is 60mm, and the edge chamfer radius is 5 mm; the distance between the column electrode and the plate electrode was 10 mm.
The invention has the advantages that: by adopting the test method of the invention, the C can be tested under the conditions of different air pressures, mixing ratios and the like5F10Industrial frequency insulation characteristic, lightning impulse characteristic and operation impulse characteristic of O mixed gas, thereby studying buffer gas and C5F10O is atContent ratio in mixed gas to C5F10And the influence rule of the insulation strength of the O-mixed gas confirms the influence rule of the influence factors of the insulation performance of the O-mixed gas, and has guiding significance for engineering application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following 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.
C5F10The test method for the electrical insulation characteristic of the O-mixed gas comprises the following steps:
s1: to C5F10Performing a power frequency breakdown test on the O mixed gas; cleaning preparation work before testing is carried out, a power frequency breakdown testing platform is utilized, a gradual pressurization method is adopted to apply power frequency voltage to a discharge air chamber on the power frequency breakdown testing platform, the average value of breakdown voltage after ten times of pressurization breakdown under the same condition is taken as a final testing result, and pressurization is carried out again after an interval of 5min after each breakdown.
The control range of the air pressure in the test platform is not less than-0.1-0.8 MPa, and the air tightness of the device in the air pressure control range meets the requirement that the air pressure in 24 hours is reduced by less than 0.5%; the discharge gas chamber is made of 304L stainless steel material, can bear 0.8MPa of absolute pressure at most, and has a volume of about 40L.
The specific operation of the step-by-step pressurization method is as follows: firstly, the breakdown voltage in the discharge chamber is estimated, the experimental voltage starts to be boosted from 0kV, the boosting step length is 2kV, the boosting time interval is 30s, when the applied voltage reaches 80% of the estimated value, the boosting step length is changed to 0.5kV, 1min is waited after boosting is finished each time, if the air gap in 1min is not broken down, the voltage is continuously boosted, and 1min is waited after boosting is finished each time until the air gap is broken down.
The cleaning preparation work in step S1 specifically includes:
s1.1: cleaning equipment; before the test is started, absorbent cotton is dipped in absolute ethyl alcohol, a discharge air chamber and an electrode in the air chamber are wiped clean, and dirt, particles and the like in the air chamber and on the electrode are removed to eliminate factors which may influence the test; air-drying the discharge gas chamber and the electrode in a dry and clean environment, and removing the absolute ethyl alcohol; the electrodes used in the experiment are arranged on the conducting rod by wearing dust-free rubber gloves with both hands, and the electrode spacing is adjusted;
s1.2: detecting air tightness; vacuumizing the discharge air chamber by using a vacuum pump, monitoring the air pressure in the discharge air chamber by using a high-precision digital display barometer, and continuously vacuumizing for 30 minutes when the air pressure display number reaches-100.867 kPa; standing for 30min, reading the air pressure representation number to be recorded as A, continuously standing for 5h, reading the air pressure representation number to be recorded as B, if B-A is less than or equal to 0.067kPa, indicating that the air chamber is good in air tightness in a vacuum state, otherwise, carrying out air tightness leakage detection on the device; then 0.5MPa of buffer gas (nitrogen or air) is filled into the air chamber with detected air tightness, the sealing connection part of the discharge air chamber is wrapped by a plastic film by adopting a local wrapping method, whether the wrapped film is bulged or not is observed after 24 hours, if not, the air chamber has good air tightness under a high-pressure state, otherwise, the air tightness leakage detection of the device is carried out;
s1.3: washing gas; after the leakage detection is finished, a 'gas washing' process can be carried out, and the gas chamber is washed by buffer gas to remove impurity gas in the gas chamber; firstly, introducing buffer gas into the discharge gas chamber to enable positive pressure to appear in the discharge gas chamber (the air pressure representation number is ensured to be larger than 0, and the buffer gas with two atmospheric pressures is generally introduced, namely the air pressure representation number is 0.1MPa), standing for 10 minutes, then pumping the gas chamber to vacuum by using a vacuum pump, and repeating the operations of introducing the buffer gas and pumping the vacuum for three times to ensure that no other impurity gas exists in the gas chamber.
S1.4: and (3) inflating: connecting experimental ventilation pipeline, vacuumizing the experimental pipeline, and heating to fill liquid C5F10Vials of O fluorinating agent C5F10Vaporizing O, injecting into experimental discharge gas chamber, observing precise digital barometer, stopping injection when the indicated pressure is required, standing for a period of time, and sealing gas chamber C in the experimental chamber5F10The O gas is sufficiently diffused, and if the reading number is decreased, the C injection is continued5F10O until the pressure is stabilized at the required pressure; followed byFilling buffer gas, waiting for buffer gas and C5F10Mixing the O gas uniformly, and controlling the gas pressure to carry out a breakdown experiment under different gas pressure grades; standing for at least 24h after each time of inflation;
s1.5: detecting impurities; collecting a small amount of mixed gas after each inflation is finished, detecting by using GC/MS, and if other components are found in the gas, extracting C5F10Mixing gas O, and completing the steps S1.1-S1.4 again, so as to ensure that no impurity in the gas interferes the experiment as much as possible.
S2: to C5F10Carrying out lightning impulse test on the O mixed gas; cleaning preparation work before the test is done, standard lightning impulse voltage is applied to the mixed gas by using a lightning impulse test platform, and 50% impulse breakdown voltage U of the mixed gas is obtained by a lifting method50％(ii) a The test has the advantages that the automatic grounding device is additionally arranged on the test gas tank, so that the charge of the pressure tank can be quickly discharged after each impact is finished, and the automatic grounding system is started when the charging is stopped or the emergency button is pressed; a single-side voltage-multiplying charging mode is adopted, and the charging voltage is 100 kV. The silicon controlled rectifier constant current voltage regulation, from zero to the voltage of setting continuously adjustable, the ignition discharge moment charging source automatic shutoff, has protected charging transformer and voltage regulation system's safety. The rectifier silicon stack, the charging transformer and the protection resistor are independently arranged, so that the rectifier silicon stack, the charging transformer and the protection resistor are convenient to disassemble, assemble and move. The whole set of equipment is matched with a test air chamber, so that the C under different clearance distances and different field intensity forms can be realized5F10And (4) performing an electrical insulation lightning impulse test by using the O mixed gas. The rated output voltage level is 300kV, the total energy is 30kJ, a 1.2 (+ -30%)/50 us (+ -20%) standard lightning impulse waveform can be generated after the wave head and wave tail resistors are changed, the applied standard lightning impulse voltage is measured by a resistance-capacitance voltage divider and attenuated by 670 times, and then the standard lightning impulse voltage is transmitted to an information acquisition system of a generator power frequency machine, so that the voltage waveform and the current waveform are recorded. The charging circuit is provided with a protective resistor, so that a larger short-circuit current can be generated when the pin-plate gap is broken down, and the protective resistor plays a role in preventing the short-circuit current from damaging the experimental transformer; the test air chamber is made of 304L stainless steel material and has the maximum energyCan bear 0.8MPa of absolute air pressure, and the volume of the air chamber is about 60L.
The cleaning preparation work described in step S2 specifically includes:
s2.1: a cleaning device; before each test, carefully cleaning the inner wall of the device and the artificial defect model by using alcohol, and removing impurities and dust in the electric chamber of the device; the remaining cleaning step is the same as the cleaning preparation work in step S1.
S2.2: aging the electrode; before the breakdown experiment, the discharge aging experiment is carried out on the sample electrode sample for 20-30 times, micron-sized fine impurities suspended in a discharge gas chamber are eliminated, and the breakdown voltage data is read after the breakdown voltage is stable.
In step S2, the specific operation of the lifting method is: predicting 50% breakdown voltage U1 of electrode gap in discharge gas chamber on impulse withstand voltage test platform0Taking the difference of grade delta U as 0.03U10In U10Loading as a preliminary test voltage; if the gap is not broken down, the next applied voltage should be increased by delta U, if the gap is broken down, the next applied voltage should be decreased by delta U, and the interval time between two adjacent discharges is not less than 3-5 minutes; the voltage is repeatedly applied for 20 times, and the voltage U1 of each stage is recordediNumber of pressing n1iCalculating a 50% lightning impulse discharge voltage value according to the following formula;
when the total number of times of applying the voltage in each group is recorded, if the voltage of the first applied amplitude value does not cause breakdown, counting is started from the discharge which firstly causes the breakdown of the air gap later; if the first application amplitude is U0Has caused breakdown, statistics are taken from the discharge that first did not cause air gap breakdown.
S3: to C5F10Carrying out an operation impact test on the O mixed gas; cleaning preparation work before testing is done, impact voltage is applied to the mixed gas by using an impact voltage-withstanding test platform, and 50% impact breakdown voltage U of the mixed gas is obtained by a lifting method50％. The automatic grounding device in the impulse withstand voltage test platform used in the step can quickly discharge the charge of the pressure tank after each impulse is finished, as in the step S2.
In step S3, the specific operation of the lifting method is: predicting 50% breakdown voltage U2 of electrode gap in discharge gas chamber on impulse withstand voltage test platform0Taking the difference of grade delta U as 0.02U20In U20Loading as a preliminary test voltage; if the gap is not broken down, the next applied voltage should be increased by delta U, if the gap is broken down, the next applied voltage should be decreased by delta U, and the interval time between two adjacent discharges is not less than 60 s; the voltage is repeatedly applied for 40 times, and the voltage U2 of each stage is recordediNumber of pressing n2iCalculating a 50% lightning impulse discharge voltage value according to the following formula;
when recording the total times of applying impulse voltage to each group, if the impulse voltage of the first applied amplitude value does not cause breakdown, counting is started from the discharge which firstly causes air gap breakdown later; if the first application amplitude is U20Has caused breakdown, statistics are taken from the discharge that first did not cause air gap breakdown afterwards.
The electrode of the power frequency breakdown test platform in the step S1 is a ball-ball electrode, the ball-ball electrode comprises two ball electrodes, each ball electrode is respectively connected with a high-voltage guide rod and a ground electrode guide rod, each ball electrode is detachable, and the length of the ground electrode guide rod is adjustable; the electrodes in the lightning impulse test platform and the impulse withstand voltage test platform in the steps S2 and S3 are both pin-plate electrodes, the pin-plate electrodes include column electrodes and plate electrodes, the column electrodes and the plate electrodes are separated, and a pin-plate electrode model mainly simulates the parts of the converter transformer box where the non-uniform electric field is concentrated, such as electric field concentration defects such as metallic burrs and the like caused by problems in the manufacturing process and the transportation and installation process, and the parts have high insulation risk coefficients, so that once partial discharge occurs, the field emission of electric charges is caused, the discharge can develop rapidly, and the insulation is further deteriorated.
The ball electrodes are brass ball electrodes, the ball radius of each ball electrode is 25mm, internal threads are adopted at the joint of the ball electrodes, the two ball electrodes are separated from each other, and the distance between the two ball electrodes is 2 mm; the diameter of a column electrode in the needle-plate electrode is 20mm, the edge chamfer radius is 3mm, the radius of curvature of a needle point is 65-70 mu m, and the material is carbon steel; the diameter of a plate electrode in the pin-plate electrodes is 60mm, and the edge chamfer radius is 5 mm; the distance between the column electrode and the plate electrode was 10 mm.
The above embodiments are preferred embodiments, it should be noted that the above preferred embodiments should not be considered as limiting the invention, and the scope of protection of the invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (9)
1.C5F10The method for testing the electrical insulation property of the O-mixed gas is characterized by comprising the following steps of:
s1: to C5F10Performing a power frequency breakdown test on the O mixed gas; cleaning preparation work before testing is carried out, a power frequency breakdown testing platform is utilized, a gradual pressurization method is adopted to apply power frequency voltage to a discharge air chamber on the power frequency breakdown testing platform, the average value of breakdown voltage after ten times of pressurization breakdown under the same condition is taken as a final testing result, and pressurization is carried out again after 5min interval after each breakdown;
s2: to C5F10Carrying out lightning impulse test on the O mixed gas; cleaning preparation work before the test is done, standard lightning impulse voltage is applied to the mixed gas by using a lightning impulse test platform, and 50% impulse breakdown voltage U of the mixed gas is obtained by a lifting method50％；
S3: to C5F10Carrying out an operation impact test on the O mixed gas; ready for cleaning before testingWorking, applying impulse voltage to the mixed gas by using an impulse withstand voltage test platform, and acquiring 50% impulse breakdown voltage U of the mixed gas by a lifting method50％。
2. C according to claim 15F10The test method for the electrical insulation characteristic of the O mixed gas is characterized by comprising the following steps: in step S1, the step-by-step pressurization method specifically includes: firstly, the breakdown voltage in the discharge chamber is estimated, the experimental voltage starts to be boosted from 0kV, the boosting step length is 2kV, the boosting time interval is 30s, when the applied voltage reaches 80% of the estimated value, the boosting step length is changed to 0.5kV, 1min is waited after boosting is finished each time, if the air gap in 1min is not broken down, the voltage is continuously boosted, and 1min is waited after boosting is finished each time until the air gap is broken down.
3. C according to claim 25F10The test method for the electrical insulation characteristic of the O mixed gas is characterized by comprising the following steps: the cleaning preparation work in step S1 specifically includes:
s1.1: cleaning equipment; before the test is started, absorbent cotton is dipped in absolute ethyl alcohol, a discharge air chamber and an electrode in the air chamber are wiped clean, and dirt, particles and the like in the air chamber and on the electrode are removed to eliminate factors which may influence the test; air-drying the discharge gas chamber and the electrode in a dry and clean environment, and removing the absolute ethyl alcohol; the electrodes used in the experiment are arranged on the conducting rod by wearing dust-free rubber gloves with both hands, and the electrode spacing is adjusted;
s1.2: detecting air tightness; vacuumizing the discharge air chamber by using a vacuum pump, monitoring the air pressure in the discharge air chamber by using a high-precision digital display barometer, and continuously vacuumizing for 30 minutes when the air pressure display number reaches-100.867 kPa; standing for 30min, reading the air pressure representation number to be recorded as A, continuously standing for 5h, reading the air pressure representation number to be recorded as B, if B-A is less than or equal to 0.067kPa, indicating that the air chamber is good in air tightness in a vacuum state, otherwise, carrying out air tightness leakage detection on the device; filling 0.5MPa of buffer gas into the air chamber with detected air tightness, wrapping the sealed joint of the discharge air chamber by using a plastic film by adopting a local wrapping method, observing whether the wrapped film is bulged or not after 24 hours, if not, indicating that the air chamber is good in air tightness under a high-pressure state, otherwise, carrying out air tightness leakage detection on the device;
s1.3: washing gas; cleaning the gas chamber by using buffer gas to remove impurity gas in the gas chamber;
s1.4: and (3) inflating: connecting experimental ventilation pipeline, vacuumizing the experimental pipeline, and heating to fill liquid C5F10Vials of O fluorinating agent C5F10Vaporizing O, injecting into experimental discharge gas chamber, observing precise digital barometer, stopping injection when the indicated pressure is required, standing for a period of time, and sealing gas chamber C in the experimental chamber5F10The O gas is sufficiently diffused, and if the reading number is decreased, the C injection is continued5F10O until the pressure is stabilized at the required pressure; then filling buffer gas, waiting for buffer gas and C5F10Mixing the O gas uniformly, and controlling the gas pressure to carry out a breakdown experiment under different gas pressure grades; standing for at least 24h after each time of inflation;
s1.5: detecting impurities; collecting a small amount of mixed gas after each inflation is finished, detecting by using GC/MS, and if other components are found in the gas, extracting C5F10Mixing gas O, and completing the steps S1.1-S1.4 again.
4. C according to claim 35F10The test method for the electrical insulation characteristic of the O mixed gas is characterized by comprising the following steps: the specific operation of step S1.3 is: firstly, introducing buffer gas into the discharge gas chamber to enable positive pressure to appear in the discharge gas chamber, standing for 10 minutes, then pumping the gas chamber to vacuum by using a vacuum pump, and repeating the operations of introducing the buffer gas and pumping the vacuum for three times to ensure that no other impurity gas exists in the gas chamber.
5. C according to claim 15F10The test method for the electrical insulation characteristic of the O mixed gas is characterized by comprising the following steps: in step S2, the specific operation of the lifting method is: predicting 50% breakdown voltage U1 of electrode gap in discharge gas chamber on impulse withstand voltage test platform0Get itStep difference Δ U of 0.03U10In U10Loading as a preliminary test voltage; if the gap is not broken down, the next applied voltage should be increased by delta U, if the gap is broken down, the next applied voltage should be decreased by delta U, and the interval time between two adjacent discharges is not less than 3-5 minutes; the voltage is repeatedly applied for 20 times, and the voltage U1 of each stage is recordediNumber of pressing n1iCalculating a 50% lightning impulse discharge voltage value according to the following formula;
when the total number of times of applying the voltage in each group is recorded, if the voltage of the first applied amplitude value does not cause breakdown, counting is started from the discharge which firstly causes the breakdown of the air gap later; if the first application amplitude is U0Has caused breakdown, statistics are taken from the discharge that first did not cause air gap breakdown.
6. C according to claim 55F10The test method for the electrical insulation characteristic of the O mixed gas is characterized by comprising the following steps: the cleaning preparation work described in step S2 specifically includes:
s2.1: a cleaning device; before each test, carefully cleaning the inner wall of the device and the artificial defect model by using alcohol, and removing impurities and dust in the electric chamber of the device;
s2.2: aging the electrode; before the breakdown experiment, the discharge aging experiment is carried out on the sample electrode sample for 20-30 times, micron-sized fine impurities suspended in a discharge gas chamber are eliminated, and the breakdown voltage data is read after the breakdown voltage is stable.
7. C according to claim 15F10The test method for the electrical insulation characteristic of the O mixed gas is characterized by comprising the following steps: in step S3, the specific operation of the lifting method is: predicting 50% breakdown voltage U2 of electrode gap in discharge gas chamber on impulse withstand voltage test platform0Taking the difference of grade delta U as 0.02U20In U20Loading as a preliminary test voltage; if the gap is not broken down, the next applied voltage should be increased by delta U, if the gap is broken down, the next applied voltage should be decreased by delta U, and the interval time between two adjacent discharges is not less than 60 s; the voltage is repeatedly applied for 40 times, and the voltage U2 of each stage is recordediNumber of pressing n2iCalculating a 50% lightning impulse discharge voltage value according to the following formula;
when recording the total times of applying impulse voltage to each group, if the impulse voltage of the first applied amplitude value does not cause breakdown, counting is started from the discharge which firstly causes air gap breakdown later; if the first application amplitude is U20Has caused breakdown, statistics are taken from the discharge that first did not cause air gap breakdown afterwards.
8. C according to claim 15F10The test method for the electrical insulation characteristic of the O mixed gas is characterized by comprising the following steps: the electrode of the power frequency breakdown test platform in the step S1 is a ball-ball electrode, the ball-ball electrode comprises two ball electrodes, each ball electrode is respectively connected with a high-voltage guide rod and a ground electrode guide rod, each ball electrode is detachable, and the length of the ground electrode guide rod is adjustable; the electrodes in the lightning impulse test platform and the impulse withstand voltage test platform in the steps S2 and S3 are all pin-plate electrodes, the pin-plate electrodes comprise column electrodes and plate electrodes, and the column electrodes are separated from the plate electrodes.
9. C according to claim 85F10The test method for the electrical insulation characteristic of the O mixed gas is characterized by comprising the following steps: the ball electrodes are brass ball electrodes, the ball radius of each ball electrode is 25mm, internal threads are adopted at the joint of the ball electrodes, the two ball electrodes are separated from each other, and the distance between the two ball electrodes is 2 mm; the diameter of a column electrode in the needle-plate electrode is 20mm, the edge chamfer radius is 3mm, the radius of curvature of a needle point is 65-70 mu m,the material is carbon steel; the diameter of a plate electrode in the pin-plate electrodes is 60mm, and the edge chamfer radius is 5 mm; the distance between the column electrode and the plate electrode was 10 mm.
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