CN103063931A - 500 kV constant-voltage transformer (CVT) multiple-project dielectric loss testing system and testing method thereof - Google Patents
500 kV constant-voltage transformer (CVT) multiple-project dielectric loss testing system and testing method thereof Download PDFInfo
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- CN103063931A CN103063931A CN2013100024139A CN201310002413A CN103063931A CN 103063931 A CN103063931 A CN 103063931A CN 2013100024139 A CN2013100024139 A CN 2013100024139A CN 201310002413 A CN201310002413 A CN 201310002413A CN 103063931 A CN103063931 A CN 103063931A
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Abstract
The invention discloses a 500 kV constant-voltage transformer (CVT) multiple-project dielectric loss testing system. The 500 kV CVT multiple-project dielectric loss testing system is characterized by comprising a vehicle-mounted dielectric loss testing instrument and a capacitive voltage mutual inductor. The vehicle-mounted dielectric loss testing instrument comprises a transformer with two output coils. The first output coil is connected with a relay in parallel at one end and connected with the ground at the other end. The second output coil is connected with the ground at one end and connected into the capacitive voltage mutual inductor through a high-voltage vacuum relay. A measuring process is automatic, lines are connected once and operation is performed with one key. Time spent in finishing all 500kV CVT testing projects is effectively reduced. By means of effectively function integrity, the size is reduced, line connecting times are reduced, the working efficiency is improved and the labor intensity is reduced and time is shortened by two thirds. Two capacitors can be simultaneously measured with two output channels of the instrument.
Description
Technical field
The present invention relates to the instrumental function that a kind of method of electricity consumption is measured, relate in particular to test macro and method of testing that a kind of primary connection can be finished the multinomial dielectric loss test of 500kV CVT, belong to electric system capacitance type potential transformer dielectric loss field tests.
Background technology
Capacitance type potential transformer (be called for short CVT) thus be the important electrical that obtains the voltage monitoring signal and cooperate communication by capacitance partial pressure, the high-potting judgment basis that whether qualified its voltage-dividing capacitor is
Be capacitance Cx and dielectric loss angle tangent tan δ.For the 500kV capacitance type potential transformer, going up most joint voltage-dividing capacitor top links to each other with the 500kV circuit by once going between, 500kV electric field induction electric strength is excessive, it is too high to go up most joint voltage-dividing capacitor distance from top ground, even repeatedly wiring and tear bus open and take measures still can bring potential safety hazard to operating personnel.The test of 500kV CVT dielectric loss electric capacity will divide three wiring, measures respectively, and upper joint C11 reverse wiring, the positive connection of C12, C13 and C2 CVT self-excitation method, connection times is many, measures often, and time-consuming many, workload is large, and efficient is low, and test period is long.And dielectric loss instrument in the past is single-set operation, namely will bring up to the vehicles to move down in process of the test, and then test to field wiring.
Summary of the invention
The object of the invention is to overcome above-mentioned shortcoming, provides a kind of primary connection can finish the vehicle-mounted dielectric loss test macro of each electric capacity all test subjects in the capacitance type potential transformer.
For solving the problems of the technologies described above, the invention provides the multinomial dielectric loss test macro of a kind of 500kV CVT, it is characterized in that, comprise vehicle-mounted dielectric loss measuring instrument and capacitance type potential transformer, described vehicle-mounted dielectric loss measuring instrument comprises transformer, transformer has two output windings, and an end of output winding one is connected in series relay, other end ground connection; One end ground connection of transformer output winding two, the other end is connected to capacitance type potential transformer by the high pressure vacuum relay.
The multinomial dielectric loss test macro of aforesaid 500kV CVT, it is characterized in that, transformer output winding two links to each other with the contact 5 of the second high pressure vacuum relay, the contact 7 of the second high pressure vacuum relay presses the contact 7 of low-vacuum load-tripping device to link to each other with third high, third high presses the contact 3 of low-vacuum load-tripping device to be connected to the standard channel interface (CN port) of instrument current signal collection plate, the contact 3 of the second high pressure vacuum relay links to each other with the contact 3 of the first high pressure vacuum relay, 3 of each relay represents common port, 5 represent normal-closed end, and 7 represent Chang Kaiduan.
The multinomial dielectric loss test macro of aforesaid 500kV CVT, it is characterized in that, described capacitance type potential transformer comprises the first capacitor C 11 that is connected in series successively, the second capacitor C 12, the 3rd capacitor C 13 and the 4th capacitor C 2, the first electric capacity and bus join, contact between the first capacitor C 11 and the second capacitor C 12 is contact A, contact between the second capacitor C 12 and the 3rd capacitor C 13 is contact B, contact between the 3rd capacitor C 13 and the 4th capacitor C 2 is contact C, the contact 5 of the first high pressure vacuum relay is connected to multi-tap one GX1 place, GX1 is connected to contact A by high-voltage cable, the contact 7 of the first high pressure vacuum relay is connected to contact D by multi-tap two GX2 high-voltage cables, and winding two ends of capacitance type potential transformer are respectively to be connected on contact C and contact E place.
The multinomial dielectric loss test macro of aforesaid 500kV CVT is characterized in that, the capacitance type potential transformer Secondary Winding links to each other with transformer output low pressure winding 0-50V two ends by relay.
BeforeThe method of testing of the multinomial dielectric loss test macro of 500kV CVT of stating is characterized in that, may further comprise the steps:
1) the first capacitor C 11 and the second capacitor C 12 adopt the M type modes of connection, namely measure with opposition method to gather the high-pressure side electric current and analyze electric current under the first capacitor C 11 and the second capacitor C 12 states in parallel;
2) next measure with positive connection and analysis stream through the second capacitor C 12 electric currents, computational analysis draws the first capacitor C 11 electric currents of flowing through, draw respectively at last the first capacitor C 11, the second capacitor C 12 electric capacity and dielectric loss value, wherein C12 directly measures numerical value by positive connection, and C11 is calculated by formula;
3) the 3rd capacitor C 13 and the 4th capacitor C 2 are measured and are adopted self-excitation method to measure, drop into capacitance type potential transformer self-excitation voltage by switching the 0-50V output relay, namely draw first capacitance and the dielectric loss value of the 3rd capacitor C 13 with the internal standard capacity ratio, the electric capacity dielectric loss value of comparing take the 3rd capacitor C 13 as standard and drawing the 4th capacitor C 2 again, more than measure disposable finishing, as a result direct-reading.
The method of testing of the multinomial dielectric loss test macro of aforesaid 500kV CVT, it is characterized in that: in test process, the high pressure setting value is delivered to variable-frequency power sources after starting measurement, variable-frequency power sources will be exported with pid algorithm and adjust to slowly setting value, metering circuit will be surveyed height and will be sent to variable-frequency power sources, the fine setting low voltage voltage realizes accurate High voltage output; According to just/setting of reverse wiring and inside/outside standard capacitance, metering circuit is selected input and switching range automatically according to test current, metering circuit adopts Fourier transform to filter interference, isolate the signal first-harmonic, normalized current and test product electric current are carried out vector calculus, the measurement passage that namely collects by the current acquisition plate and standard channel voltage magnitude compare and calculate electric capacity, calculate tg δ by the phasometer that collects two channel signals, said process takes multiple measurements repeatedly, through intermediate result of sequencing selection, after measuring end, metering circuit is sent step-down instruction variable-frequency power sources and is depressured to slowly 0.
The beneficial effect that the present invention reaches: test macro measuring process of the present invention is automatic, and primary connection one key operation is finished 500kV CVT all test subjects, effectively reduces the test time spent.By effective Function Integration Mechanism, reduce volume, reduce connection times, increase work efficiency, reduce labour intensity, time shorten 2/3, instrument are exported two passages, finish simultaneously two capacitance measurements.Primary connection is not removed electric capacity and the measurement of dielectric loss value that bus is finished the C11 of 500kV CVT, C12, C13, C2.
Description of drawings
Fig. 1 is connection principle block diagram of the present invention;
Fig. 2 is surveying work process flow diagram of the present invention.
Wherein: 1 vehicle-mounted dielectric loss measuring instrument; 2 capacitance type potential transformers; 3 relays; 4 first high pressure vacuum relays; 5 second high pressure vacuum relays; 6 third highs are pressed low-vacuum load-tripping device; 7 capacitance type potential transformer Secondary Winding; The first capacitor C 11, the second capacitor C 12, the 3rd capacitor C 13; The 4th capacitor C 2; 9 transformers; 10 transformers output winding.
Embodiment
Below in conjunction with diagram the present invention is described in detail, the following examples can make the professional and technical personnel more understand the present invention, but do not limit in any form the present invention.
As shown in Figure 1, the multinomial dielectric loss test macro of 500kV CVT of the present invention, comprise vehicle-mounted dielectric loss measuring instrument 1 and capacitance type potential transformer 2, described vehicle-mounted dielectric loss measuring instrument comprises transformer 9, transformer has two output windings 10, one end of output winding one is connected in series relay 3, and other end ground connection is by relay 3 control 0-50V self-excitation Voltage-outputs; One end ground connection of transformer output winding two, the other end is connected to capacitance type potential transformer 2 by the high pressure vacuum relay.
Transformer output winding two links to each other with the contact 5 of the second high pressure vacuum relay 5, the contact 7 of the second high pressure vacuum relay 5 presses the contact 7 of low-vacuum load-tripping device to link to each other with third high, third high presses the contact 3 of low-vacuum load-tripping device to be connected to the standard channel interface (CN port) of instrument current signal collection plate, and the contact 3 of the second high pressure vacuum relay 5 links to each other with the contact 3 of the first high pressure vacuum relay 4.
Described capacitance type potential transformer 2 comprises the first capacitor C 11 that is connected in series successively, the second capacitor C 12, the 3rd capacitor C 13 and the 4th capacitor C 2, the first electric capacity and bus join, contact between the first capacitor C 11 and the second capacitor C 12 is contact A, contact between the second capacitor C 12 and the 3rd capacitor C 13 is contact B, contact between the 3rd capacitor C 13 and the 4th capacitor C 2 is contact C, the contact 5 of the first high pressure vacuum relay 4 is connected to multi-tap one GX1 place, GX1 and GX2 are the multi-taps that is fixed on the high pressure port place of instrument, purpose is convenient the connection with high-voltage cable and dismounting, GX1 is connected to contact A by high-voltage cable, the contact 7 of the first high pressure vacuum relay 4 is connected to contact D by multi-tap two GX2 and high-voltage cable, winding two ends of capacitance type potential transformer are respectively to be connected on contact C and contact E place
Capacitance type potential transformer Secondary Winding 7 links to each other with transformer 10 output low pressure winding 0-50V two ends by relay 3; 3 of all each relays represent common port, and 5 represent normal-closed end, and 7 represent Chang Kaiduan, and wherein the first high-voltage relay 4 is realized the switching of positive-negative connected high pressure and CVT self-excitation method high pressure; The second high-voltage relay 5, third high potential relay 6 are realized internal standard electric capacity being introduced metering circuit or the function between its shielding being changed; Relay 3 is used for realizing the control output of 0-50V self-excitation voltage.
The method of testing of the multinomial dielectric loss test macro of 500kV CVT is characterized in that, may further comprise the steps:
1) the first capacitor C 11 and the second capacitor C 12 adopt the M type modes of connection, namely measure with opposition method to gather the high-pressure side electric current and analyze electric current under the first capacitor C 11 and the second capacitor C 12 states in parallel;
2) next measure with positive connection and analysis stream through the second capacitor C 12 electric currents, computational analysis draws the first capacitor C 11 electric currents of flowing through, draw respectively at last the first capacitor C 11, the second capacitor C 12 electric capacity and dielectric loss value, wherein C12 directly measures numerical value by positive connection, and C11 is calculated by formula;
3) the 3rd capacitor C 13 and the 4th capacitor C 2 are measured and are adopted self-excitation method to measure, drop into capacitance type potential transformer self-excitation voltage by switching 0-50V output relay 3, namely first with internal standard electric capacity (50p electric capacity, " instrument internal standard (CN) electric capacity " shown in Fig. 1) relatively draw capacitance and the dielectric loss value of the 3rd capacitor C 13, the electric capacity dielectric loss value of comparing take the 3rd capacitor C 13 as standard and drawing the 4th capacitor C 2 again, more than measure disposable finishing, as a result direct-reading.
In test process, start the rear high pressure setting value of measurement and deliver to variable-frequency power sources, variable-frequency power sources will be exported with pid algorithm and adjust to slowly setting value, and metering circuit will be surveyed height and will be sent to variable-frequency power sources, and the fine setting low voltage voltage realizes accurate High voltage output; According to just/setting of reverse wiring and inside/outside standard capacitance, metering circuit is selected input and switching range automatically according to test current, metering circuit adopts Fourier transform to filter interference, isolate the signal first-harmonic, normalized current and test product electric current are carried out vector calculus, the measurement passage that namely collects by the current acquisition plate and standard channel voltage magnitude compare and calculate electric capacity, calculate tg δ by the phasometer that collects two channel signals, said process takes multiple measurements repeatedly, through intermediate result of sequencing selection, after measuring end, metering circuit is sent step-down instruction variable-frequency power sources and is depressured to slowly 0.
Vehicle-mounted dielectric loss measuring instrument of the present invention can be finished the first capacitor C 11, the second capacitor C 12, the 3rd capacitor C 13, the 4th capacitor C 2 all test subjects by primary connection, the first capacitor C 11 and the second capacitor C 12 adopt the M type mode of connection, be that electric current under the first capacitor C 11 and the second capacitor C 12 states in parallel is measured and analyzed to opposition method, positive connection measurement and analysis stream are through the second capacitor C 12 electric currents, by formula computational analysis the first capacitor C 11 electric currents that go out to flow through, draw respectively at last the first capacitor C 11, the second capacitor C 12 electric capacity and dielectric loss value.The 3rd capacitor C 13 and the 4th capacitor C 2 are measured and are adopted self-excitation method to measure, namely first the 3rd capacitor C 13 and instrument internal standard (CN) electric capacity (50p electric capacity) are relatively drawn capacitance, the dielectric loss value of the 3rd capacitor C 13, draw again the electric capacity dielectric loss value of the 4th capacitor C 2 take the 3rd capacitor C 13 as standard, more than measure disposable finishing, as a result direct-reading.
The present invention carries out commutation circuit by the high-voltage relay of instrument internal, realizes not thread-changing one-shot measurement with switching (0-50V) the output relay input CVT self-excitation voltage of instrument internal.
In test process, start the rear high pressure setting value of measurement and deliver to variable-frequency power sources, variable-frequency power sources will be exported with pid algorithm and adjust to slowly setting value, and metering circuit will be surveyed height and will be sent to variable-frequency power sources, and fine setting low pressure realizes accurate High voltage output; According to just/setting of reverse wiring and inside/outside standard capacitance, metering circuit is selected input and switching range automatically according to test current, metering circuit adopts Fourier transform to filter interference, isolate the signal first-harmonic, normalized current and test product electric current are carried out vector calculus, the measurement that namely collects by the current acquisition plate and the voltage magnitude of standard channel compare and calculate capacitance, the phase difference calculating tg δ value of two passages that pass through to gather.Above process is repeatedly to take multiple measurements, and through intermediate result of sequencing selection, after measurement finished, metering circuit was sent step-down instruction variable-frequency power sources and is depressured to slowly 0.
Claims (6)
1. multinomial dielectric loss test macro of 500kV CVT, it is characterized in that, comprise vehicle-mounted dielectric loss measuring instrument (1) and capacitance type potential transformer (2), described vehicle-mounted dielectric loss measuring instrument comprises transformer (9), transformer has two output windings (10), one end of output winding one is connected in series relay (3), other end ground connection; One end ground connection of transformer output winding two, the other end is connected to capacitance type potential transformer (2) by the high pressure vacuum relay.
2. the multinomial dielectric loss test macro of 500kV CVT according to claim 1, it is characterized in that, transformer output winding two links to each other with the contact 5 of the second high pressure vacuum relay (5), the contact 7 of the second high pressure vacuum relay (5) presses the contact 7 of low-vacuum load-tripping device to link to each other with third high, third high presses the contact 3 of low-vacuum load-tripping device to be connected to the standard channel interface of instrument current signal collection plate, the contact 3 of the second high pressure vacuum relay (5) links to each other with the contact 3 of the first high pressure vacuum relay (4), 3 of each relay represents common port, 5 represent normal-closed end, and 7 represent Chang Kaiduan.
3. the multinomial dielectric loss test macro of 500kV CVT according to claim 2, it is characterized in that, described capacitance type potential transformer (2) comprises the first capacitor C 11 that is connected in series successively, the second capacitor C 12, the 3rd capacitor C 13 and the 4th capacitor C 2, the first electric capacity and bus join, contact between the first capacitor C 11 and the second capacitor C 12 is contact A, contact between the second capacitor C 12 and the 3rd capacitor C 13 is contact B, contact between the 3rd capacitor C 13 and the 4th capacitor C 2 is contact C, the contact 5 of the first high pressure vacuum relay (4) is connected to multi-tap one GX1 place, GX1 is connected to contact A by high-voltage cable, the contact 7 of the first high pressure vacuum relay (4) is connected to contact D by multi-tap two GX2 high-voltage cables, and winding two ends of capacitance type potential transformer are respectively to be connected on contact C and contact E place.
4. according to claim 2 or the multinomial dielectric loss test macro of 3 described 500kV CVT, it is characterized in that capacitance type potential transformer Secondary Winding (7) is exported low pressure winding 0-50V two ends by relay (3) and transformer (10) and linked to each other.
5. the method for testing of the multinomial dielectric loss test macro of 500kV CVT according to claim 1 is characterized in that, may further comprise the steps:
1) the first capacitor C 11 and the second capacitor C 12 adopt the M type modes of connection, namely measure with opposition method to gather the high-pressure side electric current and analyze electric current under the first capacitor C 11 and the second capacitor C 12 states in parallel;
2) next measure with positive connection and analysis stream through the second capacitor C 12 electric currents, computational analysis draws the first capacitor C 11 electric currents of flowing through, draw respectively at last the first capacitor C 11, the second capacitor C 12 electric capacity and dielectric loss value, wherein C12 directly measures numerical value by positive connection, and C11 is calculated by formula;
3) the 3rd capacitor C 13 and the 4th capacitor C 2 are measured and are adopted self-excitation method to measure, drop into capacitance type potential transformer self-excitation voltage by switching 0-50V output relay (3), namely draw first capacitance and the dielectric loss value of the 3rd capacitor C 13 with the internal standard capacity ratio, the electric capacity dielectric loss value of comparing take the 3rd capacitor C 13 as standard and drawing the 4th capacitor C 2 again, more than measure disposable finishing, as a result direct-reading.
6. the method for testing of the multinomial dielectric loss test macro of 500kV CVT according to claim 5, it is characterized in that: in test process, the high pressure setting value is delivered to variable-frequency power sources after starting measurement, variable-frequency power sources will be exported with pid algorithm and adjust to slowly setting value, metering circuit will be surveyed height and will be sent to variable-frequency power sources, the fine setting low voltage voltage realizes accurate High voltage output; According to just/setting of reverse wiring and inside/outside standard capacitance, metering circuit is selected input and switching range automatically according to test current, metering circuit adopts Fourier transform to filter interference, isolate the signal first-harmonic, normalized current and test product electric current are carried out vector calculus, the measurement passage that namely collects by the current acquisition plate and standard channel voltage magnitude compare and calculate electric capacity, calculate tg δ by the phasometer that collects two channel signals, said process takes multiple measurements repeatedly, through intermediate result of sequencing selection, after measuring end, metering circuit is sent step-down instruction variable-frequency power sources and is depressured to slowly 0.
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| CN103983859A (en) * | 2014-06-03 | 2014-08-13 | 国家电网公司 | Transformer dielectric loss and capacitance on-line measurement device |
| CN104062508A (en) * | 2014-06-20 | 2014-09-24 | 国家电网公司 | Live detection auxiliary device for dielectric loss of voltage transformer |
| 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 |
| CN106771645A (en) * | 2016-12-12 | 2017-05-31 | 国网四川省电力公司电力科学研究院 | Capacitance type potential transformer dielectric loss and capacitance on-line monitoring method and monitoring system |
| 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 |
| CN110361686A (en) * | 2019-08-28 | 2019-10-22 | 华北电力大学（保定） | Capacitance type potential transformer fault detection method based on multi-parameter |
| 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 |
| 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 (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103983859A (en) * | 2014-06-03 | 2014-08-13 | 国家电网公司 | Transformer dielectric loss and capacitance on-line measurement device |
| CN104062508A (en) * | 2014-06-20 | 2014-09-24 | 国家电网公司 | Live detection auxiliary device for dielectric loss of voltage transformer |
| 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 |
| CN106771645A (en) * | 2016-12-12 | 2017-05-31 | 国网四川省电力公司电力科学研究院 | Capacitance type potential transformer dielectric loss and capacitance on-line monitoring method and monitoring system |
| CN106771645B (en) * | 2016-12-12 | 2019-06-25 | 国网四川省电力公司电力科学研究院 | Capacitance type potential transformer dielectric loss and capacitance on-line monitoring method and monitoring system |
| 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 |
| CN110361686A (en) * | 2019-08-28 | 2019-10-22 | 华北电力大学（保定） | Capacitance type potential transformer fault detection method based on multi-parameter |
| 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 |
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