CN203117297U - 500 kV constant-voltage transformer (CVT) multiple-project dielectric loss testing system - Google Patents
500 kV constant-voltage transformer (CVT) multiple-project dielectric loss testing system Download PDFInfo
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- CN203117297U CN203117297U CN 201320004032 CN201320004032U CN203117297U CN 203117297 U CN203117297 U CN 203117297U CN 201320004032 CN201320004032 CN 201320004032 CN 201320004032 U CN201320004032 U CN 201320004032U CN 203117297 U CN203117297 U CN 203117297U
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Abstract
The utility model 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 windings. The first output winding is connected with a relay in parallel at one end and connected with the ground at the other end. The second output winding is connected with the ground at one end and connected to the capacitive voltage mutual inductor through a high-voltage vacuum relay. The testing system disclosed by the utility model is automatic in a measuring process, 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, 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 utility model relates to the instrumental function that a kind of method of electricity consumption is measured, and relates in particular to the test macro that a kind of primary connection can be finished the multinomial dielectric loss test of 500kV CVT, belongs 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 equipment 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 is 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.500kV CVT dielectric loss electric capacity test will divide three wiring, measure respectively, on save C11 reversal connection line, the positive connection of C12, C13 and C2 CVT self-excitation method, connection times is many, measurement often, time-consuming many, workload is big, efficient is low, 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.
The utility model content
The utility model purpose 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 utility model provides a kind of 500kV CVT multinomial dielectric loss test macro, it is characterized in that, comprise vehicle-mounted dielectric loss tester and capacitance type potential transformer, described vehicle-mounted dielectric loss tester comprises transformer, transformer has two output windings, the end relay that is connected in series of output winding one, 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 links to each other with the contact 7 of the 3rd high pressure vacuum relay, the contact 3 of the 3rd high pressure vacuum relay is 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 first capacitor C 11 that is connected in series successively, second capacitor C 12, the 3rd capacitor C 13 and the 4th capacitor C 2, first electric capacity and bus join, contact between first capacitor C 11 and second capacitor C 12 is contact A, contact between 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.
The beneficial effect that the utility model reaches: test macro measuring process of the present utility model is automatic, and primary connection one key operation is finished 500kV CVT all test subjects, effectively reduces the test time spent.Integrate by effective function, reduce volume, reduce connection times, increase work efficiency, reduce labour intensity, the time shortens 2/3, and instrument is exported two passages, finishes two capacitance measurements simultaneously.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 utility model;
Fig. 2 is the utility model surveying work process flow diagram.
Wherein: 1 vehicle-mounted dielectric loss tester; 2 capacitance type potential transformers; 3 relays; 4 first high pressure vacuum relays; 5 second high pressure vacuum relays; 6 the 3rd high pressure vacuum relays; 7 capacitance type potential transformer Secondary Winding; First capacitor C 11, second capacitor C 12, the 3rd capacitor C 13; The 4th capacitor C 2; 9 transformers; 10 output windings.
Embodiment
Below in conjunction with diagram the utility model is described in detail, the following examples can make the professional and technical personnel more understand the utility model, but do not limit the utility model in any form.
As shown in Figure 1, the multinomial dielectric loss test macro of 500kV CVT of the present utility model, comprise vehicle-mounted dielectric loss tester 1 and capacitance type potential transformer 2, described vehicle-mounted dielectric loss tester comprises transformer 9, transformer has two output windings 10, the one end relay 3 that is connected in series of output winding one, other end ground connection is by relay 3 control 0-50V self-excitation voltages 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 links to each other with the contact 7 of the 3rd high pressure vacuum relay, the contact 3 of the 3rd high pressure vacuum relay is 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 first capacitor C 11 that is connected in series successively, second capacitor C 12, the 3rd capacitor C 13 and the 4th capacitor C 2, first electric capacity and bus join, contact between first capacitor C 11 and second capacitor C 12 is contact A, contact between 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, contact between the 4th capacitor C 2 and switch one K1 is contact D, and the contact that an end of a winding of capacitance type potential transformer is connected with switch two K2 is contact E.
Capacitance type potential transformer Secondary Winding 7 links to each other with transformer 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 first high-voltage relay 4 is realized the switching of positive reversal connection high pressure and CVT self-excitation method high pressure; Second high-voltage relay 5, the 3rd high-voltage 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) first capacitor C 11 and second capacitor C 12 adopt the M type modes of connection, namely measure with opposition method and gather the high-pressure side electric current and analyze electric current under first capacitor C 11 and second capacitor C, 12 states in parallel;
2) next measure with positive connection and analysis stream through second capacitor C, 12 electric currents, computational analysis draws first capacitor C, 11 electric currents of flowing through, draw first capacitor C 11, second capacitor C, 12 electric capacity and dielectric loss value at last respectively, 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 earlier 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, be the electric capacity dielectric loss value that standard is compared and drawn the 4th capacitor C 2 with the 3rd capacitor C 13 again, more than measure disposable finishing, direct-reading as a result.
In test process, start measurement back high pressure setting value and deliver to variable-frequency power sources, variable-frequency power sources will be exported with pid algorithm and adjust to setting value slowly, 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 pressure output; According to just/setting of reversal connection line 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, namely the measurement passage that 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 0 slowly.
Vehicle-mounted dielectric loss tester of the present utility model can be finished first capacitor C 11, second capacitor C 12, the 3rd capacitor C 13, the 4th capacitor C 2 all test subjects by primary connection, first capacitor C 11 and second capacitor C 12 adopt the M type mode of connection, be that electric current under first capacitor C 11 and second capacitor C, 12 states in parallel is measured and analyzed to opposition method, positive connection measurement and analysis stream are through second capacitor C, 12 electric currents, by formula computational analysis first capacitor C, 11 electric currents that go out to flow through, draw first capacitor C 11, second capacitor C, 12 electric capacity and dielectric loss value at last respectively.The 3rd capacitor C 13 and the 4th capacitor C 2 are measured and are adopted self-excitation method to measure, namely earlier 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, be the electric capacity dielectric loss value that standard draws the 4th capacitor C 2 with the 3rd capacitor C 13 again, more than measure disposable finishing, direct-reading as a result.
The utility model 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 measurement back high pressure setting value and deliver to variable-frequency power sources, variable-frequency power sources will be exported with pid algorithm and adjust to setting value slowly, and metering circuit will be surveyed height and will be sent to variable-frequency power sources, and fine setting low pressure realizes accurate high pressure output; According to just/setting of reversal connection line 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, just the voltage magnitude of the measurement that collects by the current acquisition plate and standard channel compares and calculates capacitance, the phase difference calculating tg δ value of two passages that pass through to gather.Above process is to take multiple measurements repeatedly, 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 0 slowly.
Claims (4)
1. multinomial dielectric loss test macro of 500kV CVT, it is characterized in that, comprise vehicle-mounted dielectric loss tester (1) and capacitance type potential transformer (2), described vehicle-mounted dielectric loss tester comprises transformer (9), transformer has two output windings, the one end relay (3) that is connected in series of output winding one, 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) links to each other with the contact 7 of the 3rd high pressure vacuum relay, the contact 3 of the 3rd high pressure vacuum relay is 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 first capacitor C 11 that is connected in series successively, second capacitor C 12, the 3rd capacitor C 13 and the 4th capacitor C 2, first electric capacity and bus join, contact between first capacitor C 11 and second capacitor C 12 is contact A, contact between 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, winding two ends of capacitance type potential transformer are respectively to be connected on contact C and contact E place, contact between the 4th capacitor C 2 and switch one K1 is contact D, and the contact that an end of a winding of capacitance type potential transformer is connected with switch two K2 is contact E.
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) links to each other with transformer output low pressure winding 0-50V two ends by relay (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320004032 CN203117297U (en) | 2013-01-05 | 2013-01-05 | 500 kV constant-voltage transformer (CVT) multiple-project dielectric loss testing system |
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| CN 201320004032 CN203117297U (en) | 2013-01-05 | 2013-01-05 | 500 kV constant-voltage transformer (CVT) multiple-project dielectric loss testing system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105911363A (en) * | 2016-05-10 | 2016-08-31 | 国网江苏省电力公司电力科学研究院 | Transformer dielectric loss and transformer parameter comprehensive tester |
| 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 |
-
2013
- 2013-01-05 CN CN 201320004032 patent/CN203117297U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105911363A (en) * | 2016-05-10 | 2016-08-31 | 国网江苏省电力公司电力科学研究院 | Transformer dielectric loss and transformer parameter comprehensive tester |
| 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 |
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