CN201945652U - Tester for testing 500kV zinc oxide arrester - Google Patents
Tester for testing 500kV zinc oxide arrester Download PDFInfo
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- CN201945652U CN201945652U CN2011200800047U CN201120080004U CN201945652U CN 201945652 U CN201945652 U CN 201945652U CN 2011200800047 U CN2011200800047 U CN 2011200800047U CN 201120080004 U CN201120080004 U CN 201120080004U CN 201945652 U CN201945652 U CN 201945652U
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- arrester
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- 238000012360 testing method Methods 0.000 title claims abstract description 73
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 239000011787 zinc oxide Substances 0.000 title claims abstract description 28
- 229960001296 zinc oxide Drugs 0.000 claims description 24
- 210000001503 joint Anatomy 0.000 claims description 13
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 abstract 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 abstract 1
- 230000003068 static effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000006378 damage Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000005421 electrostatic potential Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 238000012346 open field test Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000009666 routine test Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- RNWHGQJWIACOKP-UHFFFAOYSA-N zinc;oxygen(2-) Chemical compound [O-2].[Zn+2] RNWHGQJWIACOKP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model relates to a tester for testing a 500kV zinc oxide arrester, which comprises a micro ammeter and a line side grounding disconnecting link, and is characterized in that when the line side grounding disconnecting link is in a connected position, the top of the upper segment of a zinc oxide valve plate is grounded, each segment of zinc oxide valve plates respectively forms a test loop with a direct-current generator and the ground, and the micro ammeter is connected in series onto a ground wire. When the middle segment of valve sheets is tested, the other micro ammeter and a low-voltage arrester group are also connected in series between the lower segment of valve plate and the ground. The U1mA of the low-voltage arrester group is 5kV+/-5 percent, the low-voltage arrester group is formed by serially connecting four arresters, and the U1mA of the single arrester is 1.25kV+/-5 percent. Compared with the prior art, the tester has the beneficial effects that 1) a high-voltage lead wire does not need to be dismounted or connected in high-altitude operation; 2) the grounding disconnecting link is used as a test ground wire, and the operation is simplified; and 3) the influence on the test data caused by high-voltage static electricity is eliminated, and the accuracy of the test data is ensured.
Description
Technical field
The utility model relates to electric system 500kV transformer station field, relates in particular to a kind of test unit of the 500kV of test Zinc-Oxide Arrester.
Background technology
Zinc-Oxide Arrester (being called for short MOA) is the major equipment of protection power system safety and stability operation, MOA is equivalent to the non-linear resistance that one 2～3 joint is connected in series, utilize the good non-linear volt-ampere characteristic of zinc paste to play earial drainage and the effect of cut-offfing, when normal working voltage, flow through the electric current minimum (microampere or milliampere level) of lightning arrester; When the superpotential effect, resistance sharply descends, and the superpotential energy of releasing reaches the effect of protection.
About 12 meters of 500kV MOA top high-voltage lead pitch ground, line side are provided with ground connection disconnecting link (during power down mode ground connection disconnecting link closing position), ground connection behind the discharged in series counter below the MOA, and discharge counter is used for writing down lightning-arrest action frequency.When electrical network is struck by lightning; when voltage is elevated to lightning arrester specified action voltage (one be set at system voltage 1.15 times), the lightning arrester action discharges the superpotential load; the amplitude limitation of line voltage under certain level, is protected apparatus insulatedly not to be damaged.MOA can also limit the internal overvoltage that a part is caused by operation except the restriction Lightning Over-voltage.
Electric system is normally in service, and the routine test project of Zinc-Oxide Arrester is had: 1) insulation measurement, determining whether lightning arrester makes moist, can also check for what there was a big fuse inside whether internal fuse is intact; Critical operation voltage U1mA when 2) measuring direct current 1mA checks mainly whether the valve block insulation is good, determines whether its performance meets the requirements; Leakage current when 3) measuring direct current 75%U1mA; whether purpose is to detect to allow working current up to specification for a long time; " rules " regulation; leakage current values under the 75%U1mA should be not more than 50 μ A; every index of having only MOA is all in acceptability limit; can guarantee that just it is functional, thus the safety of protection electrical equipment.
Testing crew was when carrying out the test of 500kV Zinc-Oxide Arrester in the past, must remove high-voltage connection, need 5～6 maintainers to utilize bucket arm vehicle, crane work high above the ground, because adjacent spaces or top bus are charged, cause lead-in wire to have several kilovolts even volt electrostatic potential up to ten thousand, the operating personnel is subject to electric shock; During last joint ground connection, need a testing crew and lift insulating bar and hang and provide ground wire for oneself, operation easier is big, the time is long, because each work post cross-operation and frequently disconnect high-voltage connection also constitutes certain potential safety hazard to personal and equipment.In addition, because the influence of electrostatic potential causes measuring error, and test figure is inaccurate, erroneous judgement is disconnected easily behind the dismounting high-voltage connection.
In the conventionally test test, to go up the joint high-voltage connection earlier removes, last joint test line is seen Fig. 2-1, joint test line sees that Fig. 2-2, middle joint test line see Fig. 2-3 down, and wherein R1, R2, R3 are respectively the equivalent resistance of every joint MOA valve block, insulate between MOA base and the ground.High voltage direct current generator applies the DC voltage of 200kv ± 5% respectively to every joint MOA valve block one end, ground connection constitutes test loop behind the MOA valve block other end series connection microampere meter, measure MOA respectively and respectively save Leakage Current under critical operation voltage U1mA and the 75%U1mA direct current, especially the joint test is to test as not tearing high-voltage connection open in.
Summary of the invention
The purpose of this utility model provides a kind of test unit of the 500kV of test Zinc-Oxide Arrester, overcome the deficiencies in the prior art, realize that do not tear high-voltage connection open finishes 500kV Zinc-Oxide Arrester testing experiment, test figure is accurate, for the safe operation of electric system provides reliable assurance.
For solving the problems of the technologies described above, the technical solution of the utility model is:
A kind of test unit of testing the 500kV Zinc-Oxide Arrester, comprise microampere meter, line side ground connection disconnecting link, line side ground connection disconnecting link is for closing the position, joint top ground connection on the zinc oxide valve plate, each saves zinc oxide valve plate and constitutes test loop respectively and between high voltage direct current generator and the ground, and microampere meter is connected on the ground wire.
In joint valve block when test, also connect between following joint valve block and the ground another piece microampere meter and a low voltage surge arrester group.
The U1mA of described low voltage surge arrester group is 5kV ± 5%, is in series by four lightning arresters, and the U1mA of single lightning arrester is 1.25kV ± 5%.
Compared with prior art, the beneficial effects of the utility model are:
1) do not need work high above the ground to disconnect high-voltage connection, saved the expense of work high above the ground vehicle, avoided frequently disconnecting damage and the high-altitude falling risk that high-voltage connection causes equipment.
2) utilize the at interval line-to-ground disconnecting link ground wire of doing experiment of lightning arrester, simplified control saves manpower and time, and has improved work efficiency.
3) ground connection disconnecting link ground connection is good, has avoided the high-pressure electrostatic injury, has eliminated the influence of high-pressure electrostatic to test data, and the test figure accuracy is met the demands, and has avoided erroneous judgement disconnected, guarantees that equipment " health " puts into operation, and guarantees power supply reliability, and equipment failure rate is zero.
Description of drawings
Fig. 1-the 1st, the wiring schematic diagram of joint is gone up in the utility model test;
Fig. 1-2 is the utility model test wiring schematic diagram of joint down;
Fig. 1-the 3rd, the wiring schematic diagram of joint in the utility model test;
Fig. 2-the 1st, the wiring schematic diagram that saves on the conventionally test;
Fig. 2-the 2nd, conventionally test is the wiring schematic diagram of joint down;
Fig. 2-the 3rd, the wiring schematic diagram that saves in the conventionally test.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described further:
A kind of test unit of testing the 500kV Zinc-Oxide Arrester of the utility model keeps in process of the test and saves high-voltage connection, and the line side ground connection disconnecting link that closes is eliminated electrostatic interference as the test ground wire, and its concrete operations step is as follows:
1) see Fig. 1-1, at first go up joint test, the microampere meter of between lightning arrester line side ground connection disconnecting link and ground, connecting, utilize high voltage direct current generator on the Zinc-Oxide Arrester joint and middle joint between contact apply DC voltage, when microampere meter numerical value reaches 1mA, apply voltage and can reach 200kv ± 5%, because middle joint and joint zinc oxide valve plate series connection down, its impedance is much larger than last joint impedance, so, when last joint reaches the action of critical operation voltage, in joint and down joint be high-impedance state and be failure to actuate the leakage current when critical operation voltage U1mA of joint and 75%U1mA gone up in record respectively;
2) see Fig. 1-2, descend the joint test then, with the Zinc-Oxide Arrester valve block down the discharge counter between joint and the ground pull down and replace to microampere meter, utilize high voltage direct current generator in the Zinc-Oxide Arrester valve block, to save and down between the joint contact apply the DC voltage of about 200kv ± 5%, because last joint and the series connection of middle joint valve block, its impedance much larger than under save impedance, so, when Zinc-Oxide Arrester valve block when down joint reaches critical operation voltage action, last joint and middle joint are high-impedance state is failure to actuate, the leakage current when noting critical operation voltage U1mA of joint and 75%U1mA respectively;
3) see Fig. 1-3, joint test in carrying out at last, microampere meter one ground connection afterwards of earlier contact between joint on the valve block and the middle joint being connected, and then with the ground connection after microampere meter two and the low voltage surge arrester group of connecting successively of joint under the valve block, the U1mA of low voltage surge arrester group is 5kV ± 5%, is in series by four lightning arresters, and the U1mA of single lightning arrester is 1.25kV ± 5%, its model is the y3w0.22kV lightning arrester, and lightning arrester factory in Dalian produces.
With high voltage direct current generator in valve block, save and down between the joint contact apply DC voltage, when microampere meter one shows that electric current reaches 1mA, voltage on the middle joint valve block reaches the about 200kv of critical operation voltage ± 5%, in pressure process, to monitor the microampere meter two that string saves simultaneously and can not surpass 1mA under valve block, in order to avoid high voltage direct current generator overload, because auxiliary low voltage surge arrester group that the middle joint of joint is many down, under save the Zinc-Oxide Arrester valve block can delayed action, and middle joint regular event, thereby reached our test objective, the Leakage Current when saving critical operation voltage U1mA and 75%U1mA in the record respectively.
Do not tear high-voltage connection open in the past, do experiment for middle joint, by removing the discharge register, in the low voltage surge arrester group that serial connection is in series by four lightning arresters between joint and the ground down, purpose is to improve the critical operation voltage value of joint down, following festival-gathering delayed action, and middle joint regular event, thus reach test objective.In addition, the low voltage surge arrester group also plays protection MOA base insulation not impaired effect in process of the test.
Adopt the utility model respectively to the going up joint, middle joint, save and test down of 500kV Zinc-Oxide Arrester A, B, C three-phase, test figure result such as following table 1, to tear the data that the high-voltage connection method records open basic identical with routine.
Table 1
For guaranteeing test mass and safety, according to the relevant regulations of Liaoning Power and " power transmission and transformation equipment state overhauling testing regulations " Q/GDW168-2008, " power equipment preventive trial rules " and at the correlation test method of Zinc-Oxide Arrester, should note following item:
1) accurately read U1mA, because the volt-ampere characteristic of oxide lightning arrester, when leakage current during greater than 200 μ A, along with the rising of output voltage, electric current can sharply increase, so should rationally control the rate of rise, it is too fast to prevent to boost, and electric current is uprushed, and surpasses 1mA.
2) prevent the influence of surface leakage current, should be before the test with the surperficial wiped clean of MOA.Microampere meter in the test and high-voltage connection should use shielded conductor.
3) influence of temperature, the temperature of test specimen should not be lower than+and 5 ℃, open field test should be carried out at good weather, test under the temperature conditions by the rules regulation, otherwise low, too high excessively temperature all can influence test findings as far as possible.
4) influence of humidity, because relative humidity also can exert an influence to test result, humidity is excessive, can cause leakage current to increase severely, open field test should be carried out at good weather, and air humidity one be not higher than 80%, for ease of analyzing, should write down relative humidity during test.
5) after the off-test, reply test specimen and the capacitance type equipment that has a power failure on every side thereof fully discharge, and prevent to cause the injury of personnel's electrification.
6) do not remove in the high-voltage connection method test process in use, compare gap with test figure and manufacturer data in the past when big if find test figure, should carefully get rid of factors such as environment, temperature, humidity, shielding, the rate of rise earlier, in case of necessity, dismountable high-voltage connection is tested lightning arrester, conscientious contrast test data.
Claims (3)
1. test unit of testing the 500kV Zinc-Oxide Arrester, comprise microampere meter, line side ground connection disconnecting link, it is characterized in that, line side ground connection disconnecting link is for closing the position, joint top ground connection on the zinc oxide valve plate, each saves zinc oxide valve plate and constitutes test loop respectively and between high voltage direct current generator and the ground, and microampere meter is connected on the ground wire.
2. a kind of test unit of testing the 500kV Zinc-Oxide Arrester according to claim 1 is characterized in that, during the test of middle joint valve block, and also connect between following joint valve block and the ground another piece microampere meter and a low voltage surge arrester group.
3. a kind of test unit of testing the 500kV Zinc-Oxide Arrester according to claim 2 is characterized in that the U1mA of described low voltage surge arrester group is 5kV ± 5%, is in series by four lightning arresters, and the U1mA of single lightning arrester is 1.25kV ± 5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200800047U CN201945652U (en) | 2011-03-23 | 2011-03-23 | Tester for testing 500kV zinc oxide arrester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200800047U CN201945652U (en) | 2011-03-23 | 2011-03-23 | Tester for testing 500kV zinc oxide arrester |
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| Publication Number | Publication Date |
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| CN201945652U true CN201945652U (en) | 2011-08-24 |
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| CN2011200800047U Expired - Fee Related CN201945652U (en) | 2011-03-23 | 2011-03-23 | Tester for testing 500kV zinc oxide arrester |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221652A (en) * | 2011-03-23 | 2011-10-19 | 辽宁省电力有限公司鞍山超高压分公司 | Method and device for testing 500kV metal oxide arrester |
| CN102901894A (en) * | 2012-09-29 | 2013-01-30 | 辽宁省电力有限公司检修分公司 | Test method and device for testing 500kV zinc oxide arrester |
-
2011
- 2011-03-23 CN CN2011200800047U patent/CN201945652U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221652A (en) * | 2011-03-23 | 2011-10-19 | 辽宁省电力有限公司鞍山超高压分公司 | Method and device for testing 500kV metal oxide arrester |
| CN102901894A (en) * | 2012-09-29 | 2013-01-30 | 辽宁省电力有限公司检修分公司 | Test method and device for testing 500kV zinc oxide arrester |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE ELECTRIC NET CROP. Effective date: 20130216 Owner name: MAINTENANCE BRANCH OF LIAONING ELECTRIC POWER CO., Free format text: FORMER OWNER: AN'SHAN ULTRAHIGH PRESSURE BRANCH OF LIAONING ELECTRIC POWER CO., LTD. Effective date: 20130216 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 114002 ANSHAN, LIAONING PROVINCE TO: 110003 SHENYANG, LIAONING PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20130216 Address after: 110003 Liaoning Province glorious Street Heping District of Shenyang City No. 21 Patentee after: Maintenance Branch, Liaoning Power Co.,Ltd. Patentee after: State Grid Corporation of China Address before: 114002 No. 33 Shengli South Road, Anshan, Liaoning Patentee before: An'shan Ultrahigh Pressure Branch of Liaoning Electric Power Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110824 Termination date: 20160323 |
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| CF01 | Termination of patent right due to non-payment of annual fee |