CN102095954A - Preventive test method for capacitance voltage transformer free from dismounting lead - Google Patents
Preventive test method for capacitance voltage transformer free from dismounting lead Download PDFInfo
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- CN102095954A CN102095954A CN2010105927398A CN201010592739A CN102095954A CN 102095954 A CN102095954 A CN 102095954A CN 2010105927398 A CN2010105927398 A CN 2010105927398A CN 201010592739 A CN201010592739 A CN 201010592739A CN 102095954 A CN102095954 A CN 102095954A
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Abstract
The invention provides a preventive test method for a capacitance voltage transformer free from dismounting a lead. In the method, the test is performed under the condition of not dismounting the lead. The method is characterized in that: during test of an upper segment of capacitor, after the capacitance voltage transformer is powered off and repaired, a grounding disconnecting link connected with the capacitance voltage transformer is grounded, voltage can be exerted to the lower end of C14, and an insulation resistance tester is grounded, so a measured value is an insulation resistance value of C14; in a test of the lead tan(delta) and capacitance of the capacitance voltage transformer free from dismounting the lead wire, during measurement of the upper segment of capacitor C11, the tan(delta) and the capacitance of the upper segment of capacitor C11 are measured by an opposition method; C12 and C13 are measured by an electrode negative method; and C14 and C2 can be measured by the opposition method. The test method provided by the invention has the advantages that: during test, the high voltage lead of equipment is not needed to be dismounted or connected, so the economic cost is saved greatly and the power failure time is reduced; therefore, the safety of running of the system and the power supply reliability are enhanced, the fault rate of power equipment is reduced, the service life of the equipment is prolonged, and the maintenance cost of the equipment is lowered greatly.
Description
Technical field
The present invention relates to not disconnecting lead preventive trial method of a kind of capacitance type potential transformer, belong to the power technology field.
Background technology
Capacitance type potential transformer (hereinafter to be referred as CVT) is the primary equipment of transformer station's indispensability.Capacitance type potential transformer is made of capacitive divider unit and electromagnetic unit, and the capacitive divider unit is made up of high-voltage arm electric capacity and low-voltage arm electric capacity, and electromagnetic unit is positioned at the fuel tank of joint down, is made up of intermediate transformer T, compensation reactor L, damper ZD.Secondary terminal 1a1n, dadn, capacitive divider low pressure end N and equal ground connection of winding tail end of intermediate transformer are positioned at terminal box.
According to traditional preventive trial method, the 750kV capacitance type potential transformer all will disconnect the high-voltage connection of tested device before and after test, and this need expend great amount of manpower and material resources, financial resources and time.Along with the electric equipment test method is updated, the test period of equipment is progressively shortening, but the whole power off time of equipment does not still shorten, and this is to account for the large percentage of bulk testing because disconnect the time of equipment high-voltage connection, has almost accounted for 2/3 of the bulk testing time.And with respect to other electric pressure capacitance type potential transformers, 750kV capacitance type potential transformer electric pressure height, equipment volume is bigger, the device body is higher, diameter wire is thicker, disconnecting when lead-in wire because lead-in wire position height, distortion power are big, need use large-scale crane, bucket arm vehicle at the scene, this has buried bigger potential safety hazard for on-the-spot preventive trial, and power off time length has also constituted bigger threat to the stable operation of electrical network.Therefore, invention 750kV capacitance type potential transformer not disconnecting lead preventive trial method be particularly important.
750kV capacitance type potential transformer electric pressure height, the simultaneous radio interference, interference problems such as electromagnetic interference (EMI) and electrostatic induction phenomenon are serious, and this authenticity to field test data has been brought very big test.Connection lead-in wire around the 750kV capacitance type potential transformer is longer, these lead-in wire image antennas equally stretch away, if not removing lead-in wire tests, long lead-in wire can make to disturb and increase, thereby cause the testing tool can't operate as normal, can't obtain test result accurately, this is the problem that needs research.Therefore how to take effective research technique to obtain test figure accurately, it is very necessary seeking to make capacitance type potential transformer neither to remove the test method that high-voltage connection can meet the demands again.
Summary of the invention
The objective of the invention is: in order to solve existing traditional capacitance type potential transformer preventive trial method, before and after test, all to disconnect the high-voltage connection of tested device, need expend defectives such as great amount of manpower and material resources, financial resources and time, thereby provide a kind of capacitance type potential transformer that can make neither to remove the test method that high-voltage connection can meet the demands again.
Technical scheme of the present invention is: a kind of capacitance type potential transformer is disconnecting lead preventive trial method not, and disconnecting lead is not tested, and wherein, C is held in last economize on electricity
11, down C is held in economize on electricity
14And low-voltage arm capacitor C
2The insulation resistance test method is: test C
11Electric capacity upper end pressurization during insulation resistance, following termination Insulation Resistance Tester; Test C
14During insulation resistance,, K is beaten to test position, C at this moment if testing position K is arranged
14Lower end ground connection is at C
14The upper end pressurization, Insulation Resistance Tester ground connection gets final product, if there is not testing position K, then at C
14The upper end pressurization, Insulation Resistance Tester meets C
2The lower end records insulating resistance value: R '
Under the C1=R
Under the C1+ R
C2, R '
Under the C1＞R
Under the C1Test C
2During insulation resistance, at C
2The lower end pressurization, Insulation Resistance Tester ground connection gets final product, and it is characterized in that: when economize on electricity is held in test, behind the capacitance type potential transformer interruption maintenance, coupled ground connection disconnecting link ground connection, this moment can be at C
14The lower end pressurization, Insulation Resistance Tester ground connection gets final product, and measured value is C
14Insulating resistance value; Disconnecting lead does not carry out capacitance type potential transformer lead-in wire tan δ and electric capacity test, and C is held in economize on electricity on measuring
11The time, measure upward economize on electricity with opposition method and hold C
11Tan δ and electric capacity, C
12, C
13Adopt positive connection to measure C
14, C
2Measurement adopt opposition method to measure to get final product.
Aforesaid capacitance type potential transformer is disconnecting lead preventive trial method not, it is characterized in that, the described economize on electricity appearance C that goes up
11The tg δ and the measurement of electric capacity adopt the reversal connection screen method, instrument adopts reversal connection line, C
11Upper end ground connection, the hi-line heart yearn of electric bridge connects capacitor C
11The lower end, make C
12, C
13, C
14, C
2The measuring-signal bridge circuit of not flowing through; During measurement insulation resistance, C
11Upper end ground connection, the L terminal of following termination megohmmeter, the E terminal ground connection of megohmmeter, the insulation resistance that record this moment is: R
C11// (R
C12+ R
C13+ R
C14+ R
C2) ≈ R
C11
Aforesaid capacitance type potential transformer is disconnecting lead preventive trial method not, it is characterized in that, described capacitor C
12, C
13Measurement adopt positive wiring, termination high pressure heart yearn on electric capacity respectively, following termination slotted line.
Aforesaid capacitance type potential transformer is disconnecting lead preventive trial method not, it is characterized in that, C is held in described economize on electricity down
14Measurement adopt the reversal connection screen method, the high pressure heart yearn of electric bridge meets C during measurement
14The upper end makes C
13, C
12, C
11The measuring-signal bridge circuit of not flowing through.
Aforesaid capacitance type potential transformer is disconnecting lead preventive trial method not, it is characterized in that, described capacitor C
2Measure and adopt the reversal connection screen method, the high pressure heart yearn of electric bridge connects the N terminal during measurement, should make trial voltage be no more than the dielectric level of N terminal.
Aforesaid capacitance type potential transformer is disconnecting lead preventive trial method not, it is characterized in that, for the capacitance type potential transformer that does not have K switch 1, can adopt positive connection to measure C during test
14And C
2Tandem data carry out history and alternate comparison as reference value, promptly the electric bridge hi-line connects capacitor C
14Head end, low pressure end N, the middle ground connection that becomes tail end are opened respectively, the bridge test line connects the N terminal, with intermediate transformer Secondary Winding head and the tail short circuit ground connection, can directly measure C simultaneously
14And C
2The dielectric loss of series unit and electric capacity, series connection back total capacitance C=C
14* C
2/ (C
14+ C
2) ≈ C
14
The invention has the beneficial effects as follows: capacitance type potential transformer provided by the invention is disconnecting lead preventive trial method not, it has the following advantages: need not to disconnect the equipment high-voltage connection during test, save financial cost greatly, thereby also reduced power off time simultaneously and improved the security and the power supply reliability of system's operation, reduced the failure rate of power equipment, prolong the serviceable life of equipment, greatly reduced the maintenance cost of equipment.
Description of drawings
Fig. 1 is the electrical schematic diagram of conventional condenser voltage transformer (VT).
Fig. 2 is the insulation resistance C of disconnecting lead testing capacitor formula voltage transformer (VT) not fully of the present invention
11The measurement wiring diagram.
Fig. 3 is the C of disconnecting lead testing capacitor formula voltage transformer (VT) not fully of the present invention
11Tg δ and electric capacity measure wiring diagram.
Fig. 4 is the C of disconnecting lead testing capacitor formula voltage transformer (VT) not fully of the present invention
12Tg δ and electric capacity measure wiring diagram.
Fig. 5 is the C of disconnecting lead testing capacitor formula voltage transformer (VT) not fully of the present invention
13Tg δ and electric capacity measure wiring diagram.
Fig. 6 is the C of disconnecting lead testing capacitor formula voltage transformer (VT) not fully of the present invention
14Tg δ and electric capacity measure wiring diagram.
Fig. 7 is the C of disconnecting lead testing capacitor formula voltage transformer (VT) not fully of the present invention
2Tg δ and electric capacity measure wiring diagram.
Embodiment
Below in conjunction with drawings and Examples to capacitance type potential transformer of the present invention not disconnecting lead preventive trial method be described in further detail.
According to conventional preventive trial method, capacitance type potential transformer need be removed the high-pressure side drainage thread, can test.When studying, the researchist at first removes capacitance type potential transformer high-pressure induct line and tests, and obtains basic data.Recover lead-in wire afterwards again, study the method that disconnecting lead is not tested, the data of two kinds of method tests are compared, obtaining not at last, disconnecting lead carries out the method that capacitance type potential transformer carries out preventive trial.
Table 1 capacitance type potential transformer prerun project and standard-required
750kV capacitance type potential transformer electrical schematic diagram as shown in Figure 1.
The megger test method:
When disconnecting lead was not tested, C was held in last economize on electricity
11, down C is held in economize on electricity
14And low-voltage arm capacitor C
2The insulation resistance test method is the same with the conventional test method: test C
11Electric capacity upper end pressurization during insulation resistance, following termination Insulation Resistance Tester " E "; Test C
14During insulation resistance,, K is beaten to test position, C at this moment if testing position K is arranged
14Lower end ground connection is at C
14The upper end pressurization, Insulation Resistance Tester " E " ground connection gets final product, if there is not testing position K, then at C
14The upper end pressurization, Insulation Resistance Tester " E " meets C
2The lower end records insulating resistance value: R '
Under the C1=R
Under the C1+ R
C2, R '
Under the C1＞R
Under the C1Test C
2During insulation resistance, at C
2The lower end pressurization, Insulation Resistance Tester " E " ground connection gets final product.
When economize on electricity is held in test,, therefore can't pressurize in the top because the high-pressure side is circumscribed with primary equipment.Behind the capacitance type potential transformer interruption maintenance, coupled ground connection disconnecting link ground connection, this moment can be at C
14The lower end pressurization, Insulation Resistance Tester " E " ground connection gets final product, and measured value is C
14Insulating resistance value, its test connection as shown in Figure 2.
Tan δ and electric capacitance measurement method for testing:
Disconnecting lead does not carry out capacitance type potential transformer lead-in wire tan δ and electric capacity test, and C is held in economize on electricity on measuring
11The time, if adopt positive wiring to measure, the high-pressure side might have bigger induced voltage, this will certainly cause the interference current test loop of flowing through, and causes measuring error, and line side CVT directly links to each other with circuit, if adopt positive wiring then can cause trial voltage road along the line to be sent, this is unallowed.Therefore, should measure upward economize on electricity with opposition method and hold C
11Tan δ and electric capacity, C
12C
13Adopt positive connection to measure C
14, C
2Measurement adopt opposition method to measure get final product concrete measuring principle following (illustrating) with M-8000 type dielectric loss instrument:
C
11Measuring method:
C
11The tg δ and the measurement of electric capacity adopt the reversal connection screen method, test connection is as shown in Figure 3.
Instrument adopts reversal connection line, C
11Upper end ground connection, the hi-line heart yearn of electric bridge connects capacitor C
11The lower end, C for measurement point
11With C
12, C
13, C
14, C
2Series value be relation in parallel, for fear of C
12, C
13, C
14, C
2To C
11The influence of measuring should make C
12, C
13, C
14, C
2The measuring-signal bridge circuit of not flowing through, according to wiring C among the figure
11Measuring-signal flow to R
1, and the C that flows through
12, C
13, C
14, C
2Signal without R
1Directly get back to the X end, provide by power supply, and the pontic itself of not flowing through has so just been got rid of C by shielding line
12, C
13, C
14, C
2Influence.
During measurement insulation resistance, C
11Upper end ground connection, the L terminal of following termination megohmmeter, the E terminal ground connection of megohmmeter.The insulation resistance that record this moment is: R
C11// (R
C12+ R
C13+ R
C14+ R
C2) ≈ R
C11, the insulation resistance project that other several economize on electricitys are held is because the situation during with disconnecting lead is consistent, so no longer narration.
C
12, C
13Measuring method:
Capacitor C
12, C
13Measurement adopt positive wiring, identical with traditional measuring method.Termination high pressure heart yearn on electric capacity respectively, following termination slotted line, measuring principle figure are respectively as Fig. 4, shown in Figure 5.
C
14Measuring method:
C
14Measurement should adopt the reversal connection screen method, measuring principle is seen Fig. 6.
K switch during measurement
1Closure, K
2Disconnect, the high pressure heart yearn of electric bridge meets C
14The upper end is because K
1C when closed
11Head end and C
14End all be ground connection, so the data of measuring are C
13, C
12, C
11Series connection after and C
14The parallel connection value, for fear of C
13, C
12, C
11To C
14The influence of measurement data should make C
13, C
12, C
11The measuring-signal bridge circuit of not flowing through, according to wiring C among the figure
14Measuring-signal flow to R
1, and the C that flows through
13, C
12, C
11Signal without R
1Directly get back to the X end, provide by power supply, and the pontic itself of not flowing through has so just been got rid of C by shielding line
13, C
12, C
11Influence.
C
2Measuring method:
C
2Measuring principle see Fig. 7.
K switch during measurement
1Closure, K
2Disconnect, the high pressure heart yearn of electric bridge connects the N terminal, because K
1C when closed
11Head end and C
14End all be ground connection, C
11, C
12, C
13, C
14Be equivalent to by short circuit, can not exert an influence, but should notice that trial voltage must not surpass the dielectric level of N terminal measuring.
For the 750kV capacitance type potential transformer that does not have K switch 1, can adopt positive connection to measure C during test
14And C
2Tandem data carry out history and alternate comparison as reference value, promptly the electric bridge hi-line connects capacitor C
14Head end, low pressure end N, the middle ground connection that becomes tail end are opened respectively, the bridge test line connects the N terminal, with intermediate transformer Secondary Winding head and the tail short circuit ground connection, can directly measure C simultaneously
14And C
2The dielectric loss of series unit and electric capacity, series connection back total capacitance C=C
14* C
2/ (C
14+ C
2) ≈ C
14
According to the actual measurement comparison result, disconnecting lead does not carry out 750kV capacitance type potential transformer test, in test 750kV capacitance type potential transformer high-voltage capacitance joint, down when joint, low-voltage arm electric capacity, test figure is with to remove lead-in wire gained data basic identical.Joint capacitance that test figure is surveyed is bigger than normal on the high-voltage capacitance, this is because not during disconnecting lead, last economize on electricity appearance is tested with the reversal connection line method, when test, be subjected to the influence of stray capacitance over the ground of high-potting line, cause surveying capacitance certain deviation is arranged, but see by the measured data contrast, error can both be controlled within the acceptable range, the data that the not disconnecting lead measurement 750kV capacitance type potential transformer method of testing that measured data that comprehensive scene obtains and above analysis can illustrate invention is surveyed are accurate, and method is feasible.
Claims (6)
1. capacitance type potential transformer disconnecting lead preventive trial method not, disconnecting lead is not tested, and wherein, C is held in last economize on electricity
11, down C is held in economize on electricity
14And low-voltage arm capacitor C
2The insulation resistance test method is:
Test C
11Electric capacity upper end pressurization during insulation resistance, following termination Insulation Resistance Tester;
Test C
14During insulation resistance,, K is beaten to test position, C at this moment if testing position K is arranged
14Lower end ground connection is at C
14The upper end pressurization, Insulation Resistance Tester ground connection gets final product, if there is not testing position K, then at C
14The upper end pressurization, Insulation Resistance Tester meets C
2The lower end records insulating resistance value: R '
Under the C1=R
Under the C1+ R
C2, R '
Under the C1＞R
Under the C1
Test C
2During insulation resistance, at C
2The lower end pressurization, Insulation Resistance Tester ground connection gets final product, and it is characterized in that:
When economize on electricity is held in test, behind the capacitance type potential transformer interruption maintenance, coupled ground connection disconnecting link ground connection, this moment can be at C
14The lower end pressurization, Insulation Resistance Tester ground connection gets final product, and measured value is C
14Insulating resistance value;
Disconnecting lead does not carry out capacitance type potential transformer lead-in wire tan δ and electric capacity test, and C is held in economize on electricity on measuring
11The time, measure upward economize on electricity with opposition method and hold C
11Tan δ and electric capacity, C
12, C
13Adopt positive connection to measure C
14, C
2Measurement adopt opposition method to measure to get final product.
2. capacitance type potential transformer according to claim 1 is disconnecting lead preventive trial method not, it is characterized in that, the described economize on electricity appearance C that goes up
11The tg δ and the measurement of electric capacity adopt the reversal connection screen method, instrument adopts reversal connection line, C
11Upper end ground connection, the hi-line heart yearn of electric bridge connects capacitor C
11The lower end, make C
12, C
13, C
14, C
2The measuring-signal bridge circuit of not flowing through; During measurement insulation resistance, C
11Upper end ground connection, the L terminal of following termination megohmmeter, the E terminal ground connection of megohmmeter, the insulation resistance that record this moment is: R
C11// (R
C12+ R
C13+ R
C14+ R
C2) ≈ R
C11
3. capacitance type potential transformer according to claim 1 is disconnecting lead preventive trial method not, it is characterized in that described capacitor C
12, C
13Measurement adopt positive wiring, termination high pressure heart yearn on electric capacity respectively, following termination slotted line.
4. capacitance type potential transformer according to claim 1 is disconnecting lead preventive trial method not, it is characterized in that, C is held in described economize on electricity down
14Measurement adopt the reversal connection screen method, the high pressure heart yearn of electric bridge meets C during measurement
14The upper end makes C
13, C
12, C
11The measuring-signal bridge circuit of not flowing through.
5. capacitance type potential transformer according to claim 1 is disconnecting lead preventive trial method not, it is characterized in that described capacitor C
2Measure and adopt the reversal connection screen method, the high pressure heart yearn of electric bridge connects the N terminal during measurement, should make trial voltage be no more than the dielectric level of N terminal.
6. capacitance type potential transformer according to claim 1 is disconnecting lead preventive trial method not, it is characterized in that, for the capacitance type potential transformer that does not have K switch 1, can adopt positive connection to measure C during test
14And C
2Tandem data carry out history and alternate comparison as reference value, promptly the electric bridge hi-line connects capacitor C
14Head end, low pressure end N, the middle ground connection that becomes tail end are opened respectively, the bridge test line connects the N terminal, with intermediate transformer Secondary Winding head and the tail short circuit ground connection, can directly measure C simultaneously
14And C
2The dielectric loss of series unit and electric capacity, series connection back total capacitance C=C
14* C
2/ (C
14+ C
2) ≈ C
14
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| CN2010105927398A CN102095954A (en) | 2010-12-17 | 2010-12-17 | Preventive test method for capacitance voltage transformer free from dismounting lead |
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|---|---|---|---|
| CN2010105927398A CN102095954A (en) | 2010-12-17 | 2010-12-17 | Preventive test method for capacitance voltage transformer free from dismounting lead |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103048549A (en) * | 2012-12-18 | 2013-04-17 | 辽宁省电力有限公司检修分公司 | Dielectric loss testing method and device of 500kV current transformer |
| CN103063931A (en) * | 2013-01-05 | 2013-04-24 | 江苏省电力公司电力科学研究院 | 500 kV constant-voltage transformer (CVT) multiple-project dielectric loss testing system and testing method thereof |
| CN103344936A (en) * | 2013-07-08 | 2013-10-09 | 广东电网公司佛山供电局 | Method for fault simulation test of capacitor voltage transformer |
| CN105277913A (en) * | 2015-09-30 | 2016-01-27 | 华中科技大学 | Capacitive-type voltage transformer testing method |
| CN106226564A (en) * | 2016-08-16 | 2016-12-14 | 国家电网公司 | High voltage capacitive-type voltage transformer without disconnecting power lead method routine test interconnecting device |
| CN106443200A (en) * | 2016-10-18 | 2017-02-22 | 国网江苏省电力公司电力科学研究院 | 1000kV ultra-high voltage CVT(constant-voltage transformer) disposable wiring automatic testing device and method |
| CN107247177A (en) * | 2017-07-31 | 2017-10-13 | 国网辽宁省电力有限公司丹东供电公司 | Remote control distribution electrical verification and ground wire detector |
| CN107449987A (en) * | 2017-08-31 | 2017-12-08 | 国网新疆电力公司检修公司 | Based on the test method of transferring the files for not tearing 750 kv transformer high pressure lead technologies open |
| CN107748295A (en) * | 2017-12-05 | 2018-03-02 | 广东电网有限责任公司电力科学研究院 | A kind of device and method of GIS disc insulators dielectric loss test |
| CN107807282A (en) * | 2017-10-31 | 2018-03-16 | 国网福建省电力有限公司 | The method of tested media loss factor and capacitance under transformer non-dismantle high voltages fuse |
| CN110221130A (en) * | 2019-04-22 | 2019-09-10 | 贵州电网有限责任公司 | A kind of capacitance type potential transformer measurement structure and measurement method |
| CN111736018A (en) * | 2020-06-29 | 2020-10-02 | 广东电网有限责任公司 | Multi-channel dielectric loss measuring device and method |
| CN113702709A (en) * | 2021-07-20 | 2021-11-26 | 中国电力科学研究院有限公司 | Method for measuring resistance value of high-voltage arm of direct-current voltage transformer |
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| CN103048549A (en) * | 2012-12-18 | 2013-04-17 | 辽宁省电力有限公司检修分公司 | Dielectric loss testing method and device of 500kV current transformer |
| CN103048549B (en) * | 2012-12-18 | 2015-11-04 | 辽宁省电力有限公司检修分公司 | A kind of 500kV current transformer dielectric loss method of testing and device |
| CN103063931A (en) * | 2013-01-05 | 2013-04-24 | 江苏省电力公司电力科学研究院 | 500 kV constant-voltage transformer (CVT) multiple-project dielectric loss testing system and testing method thereof |
| CN103344936A (en) * | 2013-07-08 | 2013-10-09 | 广东电网公司佛山供电局 | Method for fault simulation test of capacitor voltage transformer |
| CN103344936B (en) * | 2013-07-08 | 2015-11-18 | 广东电网公司佛山供电局 | Method for fault simulation test of capacitor voltage transformer |
| CN105277913A (en) * | 2015-09-30 | 2016-01-27 | 华中科技大学 | Capacitive-type voltage transformer testing method |
| CN105277913B (en) * | 2015-09-30 | 2018-06-26 | 华中科技大学 | A kind of test method of capacitance type potential transformer |
| CN106226564A (en) * | 2016-08-16 | 2016-12-14 | 国家电网公司 | High voltage capacitive-type voltage transformer without disconnecting power lead method routine test interconnecting device |
| CN106443200A (en) * | 2016-10-18 | 2017-02-22 | 国网江苏省电力公司电力科学研究院 | 1000kV ultra-high voltage CVT(constant-voltage transformer) disposable wiring automatic testing device and method |
| CN107247177A (en) * | 2017-07-31 | 2017-10-13 | 国网辽宁省电力有限公司丹东供电公司 | Remote control distribution electrical verification and ground wire detector |
| CN107449987A (en) * | 2017-08-31 | 2017-12-08 | 国网新疆电力公司检修公司 | Based on the test method of transferring the files for not tearing 750 kv transformer high pressure lead technologies open |
| CN107449987B (en) * | 2017-08-31 | 2019-09-10 | 国网新疆电力公司检修公司 | Based on the test method of transferring the files for not tearing 750 kv transformer high pressure lead technologies open |
| CN107807282A (en) * | 2017-10-31 | 2018-03-16 | 国网福建省电力有限公司 | The method of tested media loss factor and capacitance under transformer non-dismantle high voltages fuse |
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| CN111736018A (en) * | 2020-06-29 | 2020-10-02 | 广东电网有限责任公司 | Multi-channel dielectric loss measuring device and method |
| CN111736018B (en) * | 2020-06-29 | 2022-05-13 | 广东电网有限责任公司 | Multi-channel dielectric loss measuring device and method |
| CN113702709A (en) * | 2021-07-20 | 2021-11-26 | 中国电力科学研究院有限公司 | Method for measuring resistance value of high-voltage arm of direct-current voltage transformer |
| CN113702709B (en) * | 2021-07-20 | 2024-04-09 | 中国电力科学研究院有限公司 | Method for measuring resistance value of high-voltage arm of direct-current voltage transformer |
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Application publication date: 20110615 |