CN104345245A - Method for checking voltage transformer wiring correctness by using transformer turn ratio & group tester - Google Patents
Method for checking voltage transformer wiring correctness by using transformer turn ratio & group tester Download PDFInfo
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- CN104345245A CN104345245A CN201310319639.1A CN201310319639A CN104345245A CN 104345245 A CN104345245 A CN 104345245A CN 201310319639 A CN201310319639 A CN 201310319639A CN 104345245 A CN104345245 A CN 104345245A
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Abstract
The invention relates to a method for checking voltage transformer change and voltage loop wiring correctness by using a transformer turn ratio & group tester. The method comprises the following steps: (1) checking the grounding and voltage loops of three single-phase grounding type voltage transformers, (2) using a transformer turn ratio & group tester to check the change of primary and secondary main windings of the three single-phase grounding type voltage transformers and system voltage loop wiring, (3) checking the change of primary and secondary assisted windings of the three single-phase grounding type voltage transformers and zero sequence voltage loop wiring and removing all temporary test lines. According to the method, the transformer turn ratio & group tester is used to check the change of three single voltage transformers in Y0/y0/delta wiring and the voltage loop wiring, and the voltage transformer turn ratio, the lead wire phase sequence, the phase and the grounding correctness of different connection group windings can be ensured.
Description
Technical field
The present invention relates to independently three single-phase earthing type voltage transformer (VT) no-load voltage ratio and voltage circuit wiring correctness when the wiring of Y0/y0/ Δ and check field, be specially a kind of method utilizing no-load voltage ratio group tester to check voltage transformer (VT) no-load voltage ratio and voltage circuit wiring correctness.
Background technology
Voltage transformer (VT) is in transformation and distribution system, the essential and equipment easily gone wrong, and often shows as Secondary Circuit of Potential Transformer incorrect polarity, causes the phase sequence mistake of WV, no-load voltage ratio mistake and the different ground connection mistake connecting group winding, even short circuit.When voltage transformer (VT) is newly installed or after overhaul, its no-load voltage ratio and wiring whether correct, necessary inspection and test must be carried out, and whether rationally and can improve be the key differentiating wiring correctness detection method.Conventional inspection method is that three single-phase earthing type voltage transformer (VT) are after installation and wiring complete, three-phase 380V voltage is added from the high-pressure side of three voltage transformer (VT), in low-pressure side, each main Secondary Winding and auxiliary winding voltage are measured, thus try to achieve each winding no-load voltage ratio, but can not ensure once and the phase sequence of each Secondary Winding extension line, phase place and different to connect group winding earth correct.
Summary of the invention
The object of the invention is to, there is provided one transformer voltage ratio group tester to check 3 single-phase earthing type voltage transformer (VT) no-load voltage ratio and wiring correctness when the wiring of Y0/y0/ Δ, check the no-load voltage ratio of voltage transformer (VT), phase sequence, phase place and the different method connecting the correctness of group winding earth.
In order to achieve the above object, the present invention is achieved in that
Utilize transformer voltage ratio group tester to check a method for voltage transformer (VT) wiring correctness, it comprises the steps:
Step 1, the ground connection of three single-phase earthing type voltage transformer (VT) and voltage circuit to be checked;
Step 2, with transformer voltage ratio group tester to three single-phase earthing type voltage transformer (VT) once and the no-load voltage ratio of secondary main winding and system voltage circuit connection check, wherein, the high-pressure side test port of no-load voltage ratio tester is connected on system bus, and low-pressure side test port is connected on WV corresponding to mutual inductor secondary main winding outlet;
Step 3, with transformer voltage ratio group tester to three single-phase earthing type voltage transformer (VT) once and the no-load voltage ratio of secondary assistant winding (residual voltage winding) and residual voltage circuit connection check;
Step 3.1, open the 3rd (i.e. C phase) voltage transformer secondary and assist winding dn terminate ground wire;
Step 3.2, connect extraction one interim trial line from the secondary assistant winding outlet terminal da of second (i.e. B phase) voltage transformer (VT) or First (i.e. A phase) outlet terminal dn;
Step 3.3, connect extraction one interim trial line from secondary assistant winding outlet terminal dn or the 3rd (i.e. C phase) the outlet terminal da of second (i.e. B phase) voltage transformer (VT);
Step 3.4, the secondary assistant winding outlet da of First (i.e. A phase) voltage transformer (VT) and the 3rd (i.e. C phase) voltage transformer secondary are assisted winding dn interim trial line short circuit (or by WV YML and YMn interim trial line short circuit);
Step 3.5, transformer voltage ratio group tester is utilized to check the secondary assistant winding wiring of three voltage transformer (VT) and no-load voltage ratio, wherein the high-pressure side test port of tester is connected in system bus A, B, C phase, and low-pressure side test port is connected on WV YML and step 3.2, the 3.3 interim trial lines of drawing successively;
Step 3.6, recovery the 3rd (i.e. C phase) voltage transformer secondary assist winding dn terminate ground wire;
Step 3.7, remove all interim trial lines.
The present invention uses transformer voltage ratio group tester, three independent voltage transformer (VT) no-load voltage ratio and voltage circuit wiring when the wiring of Y0/y0/ Δ are checked, can guarantee new install or voltage transformer (VT) no-load voltage ratio after overhaul, extension line phase sequence, phase place, the different ground connection connecting group winding correct, avoid when checking by the method usually adding 380V voltage in voltage transformer (VT) high-pressure side, the secondary outgoing line phase sequence that may exist, phase place and differently connect the mistakes such as the ground connection of group winding.
Accompanying drawing explanation
Fig. 1 is that each main Secondary Winding no-load voltage ratio of the present invention and system voltage circuit connection check schematic diagram.
Fig. 2 is that secondary assistant winding no-load voltage ratio of the present invention and residual voltage circuit connection check schematic diagram.
Fig. 3 is that the exact connect ion of voltage transformer (VT) of the present invention when the wiring of Y0/y0/ Δ checks schematic diagram.
There are three earthed voltage transformers in Fig. 1, Fig. 2 and Fig. 3, are respectively three-phase arrangement from left to right.Often group
(21,31,41),
(22,32,42),
(23,33,43),
(24,34,44),
(25,35,45),
(26,36,46) are the wiring leading-out terminal of a voltage transformer (VT), wherein
(21,31,41),
(22,32,42) are a main winding outlet terminal,
(23,33,43),
(24,34,44) are secondary main winding outlet terminal,
(25,35,45),
(26,36,46) are secondary assistant winding outlet terminal.FU is high pressure, low-voltage variation fuse (5,10); (52,53,54) are three-phase bus; the little bus of secondary voltage that (27,37,47) are slotted line voltage; YML, YMn are the little bus of secondary voltage (6,9) measuring residual voltage, b2, c2(7,9) be the interim trial line position of drawing.
Be transformer voltage ratio group tester 1 in dotted line frame on the right side of Fig. 1 and Fig. 2, high-pressure side test port label is 11,12,13, and low-pressure side test port label is 111,112,113.
Embodiment
The present invention is further illustrated below by way of specific embodiment.
A kind of method utilizing transformer voltage ratio group tester to check voltage transformer (VT) wiring correctness it comprise:
As shown in Figure 3, to voltage transformer (VT) once, secondary voltage circuit checks, guarantees that external cabling and label are all correct.
The wiring of step 1, an inspection voltage transformer (VT) winding.Be specially: three voltage transformer (VT) outlet terminal 21,31,41 is connected with corresponding high voltage protective fuse 5, high voltage protective fuse 5 other end is connected with corresponding once bus 52,53,54, the outlet terminal 22,32,42 of three voltage transformer (VT) is interconnected and reliable ground on one point, and the fuse in primary circuit is installed, switch closes;
Check the wiring of voltage transformer secondary main winding.Be specially: the main Secondary Winding outlet terminal 23,33,43 of three mutual inductors is connected with corresponding low-voltage variation fuse 10, low-voltage variation fuse 10 other end is connected with 27,37,47 WVs respectively, the outlet terminal 24,34,44 of three voltage transformer (VT) is interconnected and is connected on 9 WVs after reliable ground on one point, and the fuse in secondary circuit is installed, switch closes;
Check boosting voltage circuit connection.Be specially: the da terminal 25 of the first from left voltage transformer (VT) is connected with low-tension fuse 10, the other end of low-tension fuse 10 is connected with YML WV 27, the dn terminal 46 of a right voltage transformer (VT) is connected with YMn WV 9, the second from left voltage transformer (VT) da secondary outlet terminal 35 is connected with the first from left voltage transformer (VT) dn secondary outlet terminal 26, the second from left voltage transformer (VT) dn secondary outlet terminal 36 is connected with a right voltage transformer (VT) da secondary outlet terminal 45, and the fuse in loop is installed, switch closes.
Step 2, transformer voltage ratio group tester is utilized to check the no-load voltage ratio of each main Secondary Winding of voltage transformer (VT) and system voltage circuit connection.
As shown in Figure 1, the height of first connection transformer no-load voltage ratio group tester 1, low-pressure side test port 11, 12, 13, 111, 112, 113 externally measured circuits, namely the high-pressure side 11 of transformer voltage ratio group tester 1, 12, 13 ports are connected to corresponding system bus 52, 53, on 54, the low-pressure side 111 of transformer voltage ratio group tester 1, 112, 113 ports are connected to corresponding WV 27, 37, 47, on, connect the power supply of transformer voltage ratio group tester 1 again, to connection group and no-load voltage ratio (or once, secondary voltage) arrange, measure no-load voltage ratio and group, the no-load voltage ratio recorded should consistent with voltage transformer (VT) nameplate and system requirements (be such as 10kV for rated voltage, no-load voltage ratio is
the no-load voltage ratio AB/ab that records of voltage transformer (VT), BC/bc, CA/ca all should be 100, and error is in allowed band), the connection group recorded is Y/y0, then show voltage transformer (VT) once and the main Secondary Winding no-load voltage ratio of correspondence and wiring all correct.When finding that there is mistake, reexamine after wiring should being corrected in time, till correct.
Step 3, transformer voltage ratio group tester is utilized to assist the no-load voltage ratio of winding and residual voltage circuit connection to check to voltage transformer secondary.
(1) open a right voltage transformer secondary and assist winding 46 terminate ground wire;
(2) when voltage transformer (VT) connection terminal is not easy to connect instrument test line, connect extraction one interim trial line from the secondary assistant winding outlet terminal 35 of the second from left voltage transformer (VT) or the first from left outlet terminal 26, it is connected on the position that can conveniently be connected with transformer voltage ratio tester 1 (as in Fig. 2 being the position of 7);
(3) when voltage transformer (VT) connection terminal is not easy to connect instrument test line, connect extraction one interim trial line from the secondary assistant winding outlet terminal 46 of the second from left voltage transformer (VT) or a right outlet terminal 45, it is connected on the position that can conveniently be connected with transformer voltage ratio tester 1 (as in Fig. 2 being the position of 8);
(4) WV 6 and 9 interim trial line short circuit;
(5) the secondary assistant winding no-load voltage ratio of three voltage transformer (VT) and residual voltage circuit connection are checked.
Connect the line of three voltage transformer (VT) and transformer voltage ratio group tester 1 as shown in Figure 2, namely the high-pressure side 11 of tester, 12, 13 ports are connected to a corresponding bus 52, 53, on 54, the low-pressure side 111 of transformer voltage ratio group tester 1, 112, 113 ports are connected to corresponding WV 6 and 7, on 8, connect transformer voltage ratio group tester 1 power supply, butted line group and no-load voltage ratio (or once, secondary voltage) arrange, measure no-load voltage ratio and group, the no-load voltage ratio recorded should be consistent with voltage transformer (VT) nameplate and system requirements (as being 10kV for rated voltage, no-load voltage ratio is
voltage transformer (VT), the no-load voltage ratio AB/ab recorded, BC/bc, CA/ca are 300, and error is within allowed band), the secondary assistant winding connected mode recorded is Δ, then the no-load voltage ratio of secondary assistant winding and wiring all correct.When finding that there is mistake, reexamine after should correcting in time, till correct.
(6) grounding connection of right voltage transformer (VT) 46 terminal is recovered.
(7) all interim trial lines are removed.
The present embodiment only provides one group of main Secondary Winding, and when there being the main Secondary Winding of many groups, test mode is identical with this group.When voltage transformer secondary voltage circuit is without fuse but when selecting switch to protect, during inspection, switch is just equal to the fuse in this figure.
In the present invention, the no-load voltage ratio measurement range of no-load voltage ratio group tester should meet the requirement that in system, voltage transformer (VT) no-load voltage ratio is measured, generally, because the no-load voltage ratio of a winding to auxiliary winding is maximum, select during test apparatus and can meet the requirement that the no-load voltage ratio measuring auxiliary winding just can meet whole measurement, such as 10kV system, tester no-load voltage ratio measurement range should be greater than 300:1, for 35kV system, tester no-load voltage ratio measurement range should be greater than 1050:1, for 110kV system, no-load voltage ratio measurement range should be greater than 3300:1.The no-load voltage ratio measurement range of current no-load voltage ratio tester is different, but maximum measurement range can reach more than 10000:1.
Claims (1)
1. utilize no-load voltage ratio group tester to check a method for voltage transformer (VT) no-load voltage ratio and voltage circuit wiring correctness, it comprises the steps:
Step 1, the ground connection of three single-phase earthing type voltage transformer (VT) and voltage circuit to be checked;
Step 2, with transformer voltage ratio group tester to three single-phase earthing type voltage transformer (VT) once and the no-load voltage ratio of secondary main winding and system voltage circuit connection check, wherein, the high-potting port of tester is connected on system bus, and low pressure test (LPT) port is connected on WV corresponding to mutual inductor main Secondary Winding outlet;
Step 3, with transformer voltage ratio group tester to three single-phase earthing type voltage transformer (VT) once and the no-load voltage ratio of secondary assistant winding (residual voltage winding) and residual voltage circuit connection check;
Step 3.1, open C phase voltage mutual inductor secondary assistant winding terminate ground wire;
Step 3.2, connect extraction one interim trial line from the secondary assistant winding outlet terminal of B phase voltage mutual inductor or A phase outlet terminal;
Step 3.3, connect extraction one interim trial line from the secondary assistant winding outlet terminal of B phase voltage mutual inductor or C phase outlet terminal;
Step 3.4, the secondary assistant winding outlet of A phase voltage mutual inductor and C phase voltage mutual inductor secondary assistant winding with interim trial line short circuit or by WV short circuit;
Step 3.5, transformer voltage ratio group tester is utilized to check the secondary assistant winding wiring of three voltage transformer (VT) and no-load voltage ratio;
Step 3.6, recovery C phase voltage mutual inductor secondary assistant winding terminate ground wire;
Step 3.7, remove all interim trial lines.
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| CN201310319639.1A CN104345245B (en) | 2013-07-26 | 2013-07-26 | Method for checking voltage transformer wiring correctness by using transformer turn ratio & group tester |
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| CN201310319639.1A CN104345245B (en) | 2013-07-26 | 2013-07-26 | Method for checking voltage transformer wiring correctness by using transformer turn ratio & group tester |
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| CN104820161A (en) * | 2015-05-21 | 2015-08-05 | 国家电网公司 | Multi-tap current transformer secondary wiring detection device |
| CN104833836A (en) * | 2015-04-23 | 2015-08-12 | 本钢板材股份有限公司 | Zero sequence voltage detection method for voltage transformer |
| CN108051662A (en) * | 2017-11-08 | 2018-05-18 | 保定天威集团特变电气有限公司 | More device body series transformer test methods, assembly and test system |
| CN110531214A (en) * | 2019-08-28 | 2019-12-03 | 中广核工程有限公司 | For detecting the detection verification method of Secondary Circuit of Potential Transformer winding short circuit |
| CN110824388A (en) * | 2019-10-22 | 2020-02-21 | 国网浙江省电力有限公司绍兴供电公司 | 4PT wiring polarity discrimination method for small current grounding system |
| CN110850352A (en) * | 2019-12-01 | 2020-02-28 | 国网辽宁省电力有限公司锦州供电公司 | Secondary circuit wiring checking method of 10kV voltage transformer |
| CN113156276A (en) * | 2021-02-22 | 2021-07-23 | 云南建投第二安装工程公司 | Method for checking and debugging secondary voltage loop in AC withstand voltage test of switchgear bus |
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| CN104833836A (en) * | 2015-04-23 | 2015-08-12 | 本钢板材股份有限公司 | Zero sequence voltage detection method for voltage transformer |
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| CN108051662A (en) * | 2017-11-08 | 2018-05-18 | 保定天威集团特变电气有限公司 | More device body series transformer test methods, assembly and test system |
| CN110531214A (en) * | 2019-08-28 | 2019-12-03 | 中广核工程有限公司 | For detecting the detection verification method of Secondary Circuit of Potential Transformer winding short circuit |
| CN110531214B (en) * | 2019-08-28 | 2022-06-07 | 中广核工程有限公司 | Detection and verification method for detecting short circuit of secondary circuit winding of voltage transformer |
| CN110824388A (en) * | 2019-10-22 | 2020-02-21 | 国网浙江省电力有限公司绍兴供电公司 | 4PT wiring polarity discrimination method for small current grounding system |
| CN110850352A (en) * | 2019-12-01 | 2020-02-28 | 国网辽宁省电力有限公司锦州供电公司 | Secondary circuit wiring checking method of 10kV voltage transformer |
| CN113156276A (en) * | 2021-02-22 | 2021-07-23 | 云南建投第二安装工程公司 | Method for checking and debugging secondary voltage loop in AC withstand voltage test of switchgear bus |
| CN113156276B (en) * | 2021-02-22 | 2024-03-29 | 云南建投第二安装工程公司 | Method for checking and debugging secondary voltage loop of bus alternating-current withstand voltage test of switching equipment |
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Address after: 201900 Shanghai city Baoshan District Tieli Road No. 2469 Patentee after: SHANGHAI ERSHIYE CONSTRUCTION Co.,Ltd. Address before: 201900 Shanghai city Baoshan District Tieli Road No. 2469 Patentee before: SHANGHAI MCC13 CONSTRUCTION Co.,Ltd. Address after: 201900 Shanghai city Baoshan District Tieli Road No. 2469 Patentee after: SHANGHAI MCC13 CONSTRUCTION Co.,Ltd. Address before: 201900 Shanghai city Baoshan District Tieli Road No. 2469 Patentee before: CMTCC Shanghai 13th Construction Co.,Ltd. |
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Effective date of registration: 20190815 Address after: 201900 Shanghai city Baoshan District Tieli Road No. 2469 Co-patentee after: CHINA MCC20 GROUP Corp.,Ltd. Patentee after: SHANGHAI ERSHIYE CONSTRUCTION Co.,Ltd. Address before: 201900 Shanghai city Baoshan District Tieli Road No. 2469 Patentee before: SHANGHAI ERSHIYE CONSTRUCTION Co.,Ltd. |