CN101930033A - Test method without disconnection of capacitor voltage transformer - Google Patents
Test method without disconnection of capacitor voltage transformer Download PDFInfo
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- CN101930033A CN101930033A CN 201010208502 CN201010208502A CN101930033A CN 101930033 A CN101930033 A CN 101930033A CN 201010208502 CN201010208502 CN 201010208502 CN 201010208502 A CN201010208502 A CN 201010208502A CN 101930033 A CN101930033 A CN 101930033A
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Abstract
The invention discloses a test method without disconnection of a capacitor voltage transformer. The capacitor voltage transformer comprises a capacitor C11, a capacitor C12, a capacitor C2, a reactor L and an intermediate transformer XT, wherein the primary capacitors (C11 and C12) and the voltage-dividing capacitor C2 constitute a capacity divider; a point A is arranged between C11 and C12, a point B is arranged between C12 and C2, a point delta is arranged on the other end of the capacitor C2; when C12 is tested, the reverse wiring method and the high voltage shielding method are used for measurement, namely the point A is connected with the high-voltage end, one end of C11 is earthed, the measuring voltage is 2kV and the point delta and a point X at the tail end of the intermediate transformer XT are connected with the shielding end; and when C12 and C2 are tested, the self-excitation method is used for measurement, namely one end of C11 is earthed, the secondary winding ax of the intermediate transformer XT is used to apply a voltage and the intermediate transformer XT is used to transform the voltage and provide a voltage. By using the test method of the invention, the testing sequences are greatly reduced, the operation procedure is simple, the test data are accurate and the reading error is small.
Description
Technical field
The present invention relates to a kind of test method of capacitance type potential transformer, be specifically related to a kind of test method without disconnection of capacitance type potential transformer.
Background technology
Capacitance type potential transformer (being called for short CVT) is a kind of crucial high-tension power transmission and transformation equipment, and the voltage transformer (VT) that China 110kV and above electric system are used at present mainly contains capacitance type potential transformer and electromagnetic potential transformer.Because CVT has the dielectric strength height, can reduce thunderbolt shock head steepness, can not be with system generation ferroresonance, cost is low and can be used for advantages such as power line carrier communication by the double as coupling condenser, simultaneously again because associated materials and improvement of Manufacturing Technology, so from twentieth century since mid-term CVT use and to develop rapidly, the quantity of using in electric system in recent years is very huge, not only on transformer station's line outlet, use, and extensive application replaces electromagnetic potential transformer in bus and transformer outlet.CVT generally is applicable to 110kV and above electric pressure, but owing to be subjected to design level, manufacturing experience, the restriction of multiple factor such as technological level and starting material, break down in the back if put into operation, will influence electric power netting safe running, be subjected to the influence of running environment and electric pressure, the equipment of 220kV and above electric pressure particularly, stature is tall and big, it is heavy to go between, make that the workload of tearing an electrical test open is big, the difficulty height, power off time is longer, and it is all charged to add surrounding devices, work by force and understand serious threat equipment and personal security, this tests CVT before use with regard to needs.Existing test method to the capacitance type potential transformer not disconnection, when experiment power supply harmonic interference or external electrical field disturb when strong, electric bridge is difficult to balance, reading error is bigger, make testing procedure various and eliminate the measure of disturbing, the program complexity, the human factor influence is big, therefore, the test method that how to find a kind of new not needing at the trial capacitance type potential transformer to be torn open head is the task of top priority.
Summary of the invention
By Given this, the test method without disconnection that the purpose of this invention is to provide a kind of capacitance type potential transformer, can effectively solve the problem that occurs in the prior art, the present invention realizes test of capacitance type potential transformer dielectric loss and electric capacity test in conjunction with self-excitation method and high-tension shielding method.
To achieve these goals, the present invention is by the following technical solutions:
A kind of test method without disconnection of capacitance type potential transformer, capacitance type potential transformer is made up of capacitor C 11, C12 and C2, reactor L and intermediate transformer XT, form capacitive divider by main capacitor (C11, C12) and voltage-dividing capacitor C2, the A point is between C11 and C12, the B point is between C12 and C2, the δ point is positioned at the other end of capacitor C 2, wherein
During test C11, measure with reversal connection collimation method and high-tension shielding method, promptly the A point connects high-pressure side, C11 one end ground connection, and measuring voltage is 2kV, δ point and intermediate transformer XT tail end X point connect the shielding end;
When test C12 and C2, measure with self-excitation method, C11 one end ground connection, ax exerts pressure by intermediate transformer XT Secondary Winding, through intermediate transformer XT transformation, provides voltage.
Further, when test C12 and C2, frequency of operation is 40～47.5Hz, and B point voltage UB ≯ 2.5kV.
Further, when testing, hi-line should unsettled placement.
A kind of not disconnection hookup of capacitance type potential transformer, comprise C11 hookup and C12, C2 hookup, wherein, described C11 hookup comprises capacitor C 11, C12, C2, reactor L and intermediate transformer XT, capacitor C 11 1 end ground connection, the other end is connected with capacitor C 12, C2, and intermediate transformer XT one end is connected between capacitor C 12, C2 through reactor L, and the intermediate transformer XT other end is connected the shielding end with capacitor C 2 one ends; Capacitor C 11, the indirect high-pressure side of C12, measuring junction ground connection;
Described C12, C2 hookup comprise capacitor C 11, C12, C2, reactor L and intermediate transformer XT, capacitor C 11 1 end ground connection, the other end is connected with capacitor C 12, C2, intermediate transformer XT one end is connected between capacitor C 12, C2 through reactor L, connect measuring junction between capacitor C 11, C12, intermediate transformer XT other end ground connection, another termination high-pressure side of capacitor C 2.
Beneficial effect of the present invention is:
The present invention when test C11 electric capacity and dielectric loss, uses the reversal connection line measurement in conjunction with self-excitation method and high-tension shielding method, and δ point and intermediate transformer tail end X point are connect the shielding end that electric bridge goes between, and eliminates the influence of branch road capacitance current; When test C12 and C2, use be that self-excitation method is measured.Test method of the present invention has significantly reduced test procedure, and running program is simple, and test figure is accurate, and reading error is little.
Other advantages of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on being conspicuous to those skilled in the art, perhaps can obtain instruction from the practice of the present invention to investigating hereinafter.Target of the present invention and other advantages can realize and obtain by specifically noted structure in following instructions or the accompanying drawing.
Description of drawings
Fig. 1 is the structure principle chart of existing capacitance type potential transformer;
Fig. 2 is for measuring the equivalent electrical circuit of C1, C2 series connection with positive wiring;
Fig. 3 is the coordinate synoptic diagram of electric current I X phase shift;
Fig. 4 is the wiring diagram of C11 hookup of the present invention;
Fig. 5 is the wiring diagram of C12 of the present invention, C2 hookup.
Embodiment
As shown in Figure 1, the 220kV capacitance type potential transformer is made up of capacitive divider (C11, C12 and C2), reactor L, intermediate transformer T and damping resistance R; Capacitive divider is made up of main capacitor (C11, C12) and voltage-dividing capacitor C2, except that as the voltage divider measuring voltage, also can be used for the power circuit carrier communication simultaneously.Capacitive divider makes higher transmission voltage drop to a suitable low-voltage, and receives on the intermediate transformer T by reactor L.Intermediate transformer T has two Secondary Winding, and main Secondary Winding is used for voltage measurement, and auxilliary Secondary Winding is used for relay protection.Damping resistance R is connected on the auxilliary Secondary Winding, is used to suppress the generation of harmonic wave.Operating CVT, its insulating property depend primarily on its capacitor cell, comprising main capacitance and dividing potential drop electric capacity, therefore in the capacitance type potential transformer test, mainly be dielectric loss (tg δ) and electric capacity, judge the quality of CVT insulating property by testing its electric capacity.
The conventionally test method has following shortcoming: capacitance type potential transformer (CVT) is stacked structure, the capacitive divider of stacked CVT and electromagnetic unit can not separate when testing at the scene, so just the electric capacity of CVT and the in-site measurement of dielectric loss measurement have been caused sizable difficulty.CVT manufacturing plant electric capacity and dielectric loss to capacitive divider before the CVT closed assembly carried out the branch bulk measurement, and to assembling, the CVT that intermediate voltage terminal is drawn, can adopt positive wiring directly to measure, and for the CVT that does not have tap, in test in the past, usually remove the lead-in wire back with positive wiring directly measure C11, C12(C11, C12 is reduced to main capacitance C1) and the series electrical capacity of C2, as shown in Figure 2, electric capacity can accurately be measured, but dielectric loss is a negative value or very little.Can recognize that by theoretical analysis this is because the stray impedance of electromagnetic unit can be modeled to a RC series connection model, makes the A point voltage leading, also cause electric current I x in advance to the second quadrant deflection, cause the δ angle to reduce to become δ ', if inclined to one side mistake just causes negative value for 90 °, as shown in Figure 3.In like manner, with the reversal connection line directly measure C11, C12(C11, C12 is reduced to main capacitance C1) and the series electrical capacity of C2, at δ end reversal connection line pressurization＜3kV, because introducing reactor and intermediate transformer loop, the dielectric loss measurement value is bigger.Therefore when testing, tearing the measurement of head back employing self-excitation method open usually, but because the self-excitation method wiring is comparatively complicated, to field condition requirement harshness, the test method that we seek not take out stitches.Fact proved that the test figure that above method obtains does not possess with reference to property, accuracy and reliability, and the work that all will repeat disconnecting lead and recover lead-in wire at every turn.
In order to overcome the above problems,, find following a kind of specially at the 220kV capacitance type potential transformer method of disconnecting lead test not by field practice and application.
As shown in Figure 4, the C11 hookup comprises capacitor C 11, C12, C2, reactor L and intermediate transformer XT, capacitor C 11 1 end ground connection, the other end is connected with capacitor C 12, C2, intermediate transformer XT one end is connected to B point between capacitor C 12, C2 through reactor L, and intermediate transformer XT other end X point is connected with the shielding end with the δ point; The A point connects high-pressure side between capacitor C 11, C12, measuring junction ground connection.In test C11 process, to measure with reversal connection collimation method (pressurization of A point, C11 upper end line-to-ground), measuring voltage is 2kV.In the normal course of operation, δ point and intermediate transformer XT tail end X point ground connection, if δ point and X point are not taken apart, then loss and the electric capacity of capacitor C 2 and intermediate transformer XT primary winding Ca are all entered in the loop, the electric capacity of measuring is connect with C12 after capacitor C 2 and the Ca parallel connection electric capacity and loss with gained after C11 is in parallel again.Therefore want to record the loss and the electric capacity of real capacitor C 11, just must connect the shielding of electric bridge lead-in wire to δ point and intermediate transformer XT tail end X point and hold, make that the capacitor cell below the A point does not enter the measurement loop among the figure, thus the influence of elimination branch road capacitance current.
As shown in Figure 5, C12, C2 hookup comprise capacitor C 11, C12, C2, reactor L and intermediate transformer XT, capacitor C 11 1 end ground connection, the other end is connected with capacitor C 12, C2, intermediate transformer XT one end is connected to B point between capacitor C 12, C2 through reactor L, the A point connects measuring junction, intermediate transformer XT other end ground connection, and the other end δ point of capacitor C 2 connects high-pressure side.When testing capacitor C12 and C2, use be that self-excitation method is measured, this moment exert pressure by intermediate transformer XT Secondary Winding ax, through intermediate transformer XT transformation, capacitor C 11 upper end line-to-grounds, electric current entered the earth after staying capacitor C 11, do not measure the loop and do not enter, do not influence the test effect.Through practice, should note in the wiring process: hi-line is answered unsettled face intangibly, otherwise its additional over the ground dielectric loss can cause error, and available Thin cable connects high-tension terminal and CVT test product and also slings.Because capacitor C 2 electric capacitys are big, add the output capacity restriction of intermediate transformer XT, frequency conversion dielectric loss instrument, CVT and resonance occurs when avoiding testing that frequency of operation should be got 40～47.5Hz, and B point voltage UB ≯ 2.5kV.
Claims (4)
1. the test method without disconnection of a capacitance type potential transformer, capacitance type potential transformer is made up of capacitor C 11, C12 and C2, reactor L and intermediate transformer XT, form capacitive divider by main capacitor (C11, C12) and voltage-dividing capacitor C2, the A point is between capacitor C 11 and capacitor C 12, the B point is between capacitor C 12 and capacitor C 2, the δ point is positioned at the other end of capacitor C 2, it is characterized in that:
During test C11, measure with reversal connection collimation method and high-tension shielding method, promptly the A point connects high-pressure side, capacitor C 11 1 end ground connection, and measuring voltage is 2kV, δ point and intermediate transformer XT tail end X point connect the shielding end;
When testing capacitor C12 and C2, measure with self-excitation method, capacitor C 11 1 end ground connection, ax exerts pressure by intermediate transformer XT Secondary Winding, through intermediate transformer XT transformation, provides voltage.
2. the test method without disconnection of a kind of capacitance type potential transformer according to claim 1 is characterized in that: when test C12 and C2, frequency of operation is 40～47.5Hz, and B point voltage UB ≯ 2.5kV.
3. the test method without disconnection of a kind of capacitance type potential transformer according to claim 1 is characterized in that: when testing, hi-line should unsettled placement.
4. the not disconnection hookup of a capacitance type potential transformer, comprise C11 hookup and C12, C2 hookup, wherein, described C11 hookup comprises capacitor C 11, C12, C2, reactor L and intermediate transformer XT, capacitor C 11 1 end ground connection, the other end is connected with capacitor C 12, C2, and intermediate transformer XT one end is connected between capacitor C 12, C2 through reactor L, and the intermediate transformer XT other end is connected the shielding end with capacitor C 2 one ends; Capacitor C 11, the indirect high-pressure side of C12, measuring junction ground connection;
Described C12, C2 hookup comprise capacitor C 11, C12, C2, reactor L and intermediate transformer XT, capacitor C 11 1 end ground connection, the other end is connected with capacitor C 12, C2, intermediate transformer XT one end is connected between capacitor C 12, C2 through reactor L, connect measuring junction between capacitor C 11, C12, intermediate transformer XT other end ground connection, another termination high-pressure side of capacitor C 2.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102269787A (en) * | 2011-05-16 | 2011-12-07 | 国网电力科学研究院 | Detection method of harmonic characteristic of electronic voltage transformer and detection device thereof |
| 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 |
| CN104569687A (en) * | 2015-01-20 | 2015-04-29 | 国家电网公司 | Capacitor bank fault detector |
| CN106249053A (en) * | 2016-08-19 | 2016-12-21 | 汪锐 | Capacitance type potential transformer dielectric loss method of testing based on resonance characteristic |
| CN106990380A (en) * | 2017-05-31 | 2017-07-28 | 国网河南省电力公司平顶山供电公司 | Live capacitance type potential transformer fault detection method |
| CN108169575A (en) * | 2018-01-16 | 2018-06-15 | 云南电网有限责任公司电力科学研究院 | The test device and method of a kind of CVT capacitances dielectric loss and capacitance |
| 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 |
| CN111239671A (en) * | 2020-03-12 | 2020-06-05 | 国电大渡河检修安装有限公司 | Method for measuring capacitance and dielectric loss value of upper-node coupling capacitor of CVT (constant-Voltage Transformer) |
| 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 |
| CN112485535A (en) * | 2020-11-20 | 2021-03-12 | 贵州电网有限责任公司 | Test method for 110kV capacitor voltage transformer without disassembling lead |
| CN112540233A (en) * | 2020-11-03 | 2021-03-23 | 国网新疆电力有限公司乌鲁木齐供电公司 | Dielectric loss measurement method for 220KV voltage transformer lead-disassembly-free wire |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102269787A (en) * | 2011-05-16 | 2011-12-07 | 国网电力科学研究院 | Detection method of harmonic characteristic of electronic voltage transformer and detection device thereof |
| 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 |
| CN104569687A (en) * | 2015-01-20 | 2015-04-29 | 国家电网公司 | Capacitor bank fault detector |
| CN106249053B (en) * | 2016-08-19 | 2018-10-30 | 汪锐 | Capacitance type potential transformer dielectric loss test method based on resonance characteristic |
| CN106249053A (en) * | 2016-08-19 | 2016-12-21 | 汪锐 | Capacitance type potential transformer dielectric loss method of testing based on resonance characteristic |
| CN106990380A (en) * | 2017-05-31 | 2017-07-28 | 国网河南省电力公司平顶山供电公司 | Live capacitance type potential transformer fault detection method |
| CN108169575A (en) * | 2018-01-16 | 2018-06-15 | 云南电网有限责任公司电力科学研究院 | The test device and method of a kind of CVT capacitances dielectric loss and capacitance |
| CN108169575B (en) * | 2018-01-16 | 2020-07-17 | 云南电网有限责任公司电力科学研究院 | Method for testing dielectric loss and capacitance of CVT capacitor |
| 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 |
| CN111239671A (en) * | 2020-03-12 | 2020-06-05 | 国电大渡河检修安装有限公司 | Method for measuring capacitance and dielectric loss value of upper-node coupling capacitor of CVT (constant-Voltage Transformer) |
| 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 |
| CN112540233A (en) * | 2020-11-03 | 2021-03-23 | 国网新疆电力有限公司乌鲁木齐供电公司 | Dielectric loss measurement method for 220KV voltage transformer lead-disassembly-free wire |
| CN112485535A (en) * | 2020-11-20 | 2021-03-12 | 贵州电网有限责任公司 | Test method for 110kV capacitor voltage transformer without disassembling lead |
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Application publication date: 20101229 |