CN202133724U - Error test device of zero sequence voltage transformers - Google Patents
Error test device of zero sequence voltage transformers Download PDFInfo
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- CN202133724U CN202133724U CN201120130485U CN201120130485U CN202133724U CN 202133724 U CN202133724 U CN 202133724U CN 201120130485 U CN201120130485 U CN 201120130485U CN 201120130485 U CN201120130485 U CN 201120130485U CN 202133724 U CN202133724 U CN 202133724U
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- voltage
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- zero sequence
- winding
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Abstract
The utility model relates to an error test device of zero sequence voltage transformers, characterized in that an output end of a three-phase voltage regulator is connected with a primary end of a three-phase transformer, a secondary neutral point of the three-phase transformer is not grounded, and a primary winding of a single phase voltage transformer is in star connections with three tested same specification zero sequence voltage transformers; a secondary winding of the single phase voltage transformer is connected with a power supply voltage observing voltmeter, and when the voltage of the voltmeter indicates a rated interphase voltage, primary voltages of the zero sequence voltage transformers are working voltages; a secondary monitoring measurement winding is connected with a voltage measurement change-over switch, and secondary protection windings of the zero sequence voltage transformers are connected with a rated interphase voltage recording voltmeter, the polarity ends of the primary windings of the zero sequence voltage transformers are connected with the primary neutral points of the voltage transformers and are in secondary grounding with a simulative single bus grounding fault device. The advantage of the utility model is that the monitoring for the actual working voltages of the zero sequence voltage transformers is carried out by connecting the zero sequence voltage transformers on the interphase voltmeters, so that the primary working voltages of the zero sequence voltage transformers can be caught accurately.
Description
Technical field
The utility model relates to the error test device of zero sequential potential transformer, belongs to mutual inductor test field.
Background technology
Zero sequential potential transformer is connected between neutral point of voltage transformer (VT) and the ground; To preventing that parallelly connected ferroresonance very effectively; Technical conditions stipulate that its ratio error is not more than 5%, primary voltage 6 (10,35)/√ 3kV, secondary voltage 100V, 100/ √ 3V; Carry out ratio error and test according to this that data are as the criterion, it is qualified to judge whether.In fact this test method is not to carry out down in working order, because the imbalance of three-phase load causes neutral point excursion one time, its primary voltage is little more a lot of than the top value that provides in this state, causes error very big during zero sequential potential transformer work.
Summary of the invention
In view of the defective that prior art exists, the purpose of the utility model provides a kind of error test device of zero sequential potential transformer.
For realizing above-mentioned purpose; The technical solution that the utility model adopted mainly is: the output terminal of three-phase regulator is received the once end of three-phase transformer; The secondary neutral of three-phase transformer is earth-free; Press Y-connection for three that winding of single-phase potential transformer is identical with quilt examination zero sequential potential transformer specification; Single-phase potential transformer Secondary Winding and supply voltage are observed voltage table and are connected, and when this voltage was indicated specified voltage between phases, the primary voltage of residual voltage voltage transformer (VT) was a WV.Secondary control survey winding is connected with the voltage measurement switch; Zero sequential potential transformer second protection winding connects specified voltage between phases recording voltmeter, and winding polar end of zero sequential potential transformer connects with neutral point of voltage transformer (VT) and follows and simulate single busbar earth fault device secondary ground connection.
The beneficial effect of the utility model is: the utility model is to utilize to be connected on alternate voltage table and to carry out to the supervision of zero sequential potential transformer real work voltage, can accurately pounce on the one action voltage of grasping zero sequential potential transformer.
Description of drawings
Fig. 1 is the structure diagram of the error test device of zero sequential potential transformer.
Fig. 1 Reference numeral is following: 1, three-phase regulator, 2, three-phase transformer, 3, winding of single-phase potential transformer; 4, single-phase potential transformer secondary winding, 5, supply voltage observes voltage table, 6, secondary control survey winding; 7, voltage measurement switch, 8, specified voltage between phases recording voltmeter, 9, zero sequential potential transformer second protection winding; 10, zero sequential potential transformer second protection winding, 11, simulation single busbar earth fault device.
Embodiment
In the structure diagram of the error test device of zero sequential potential transformer shown in Figure 1; Its primary structure comprises: the output terminal of three-phase regulator 1 is received the once end of three-phase transformer 2; The secondary neutral of three-phase transformer 2 is earth-free; Press Y-connection for three that winding 3 of single-phase potential transformer is identical with quilt examination zero sequential potential transformer specification; Single-phase potential transformer Secondary Winding 4 and supply voltage are observed voltage table 5 and are connected, and when this voltage was indicated specified voltage between phases, the primary voltage of residual voltage voltage transformer (VT) was a WV.Secondary control survey winding 6 is connected with voltage measurement switch 7; Zero sequential potential transformer second protection winding 9 connects specified voltage between phases recording voltmeter 8, and winding 10 polar ends of zero sequential potential transformer are connected with neutral point of voltage transformer (VT) and follow and simulate single busbar earth fault device 11 secondary ground connection.Regulate supply voltage observation voltage table V1 during test and indicate specified voltage between phases recording voltmeter V2 indicating value, the error of calculation.
Claims (1)
1. the error test device of zero sequential potential transformer; The output terminal of three-phase regulator (1) is received the once end of three-phase transformer (2); Press Y-connection for three that a winding of single-phase potential transformer (3) is identical with quilt examination zero sequential potential transformer specification; Single-phase potential transformer Secondary Winding (4) is observed voltage table (5) with supply voltage and is connected; When this voltage is indicated specified voltage between phases; The primary voltage of residual voltage voltage transformer (VT) is a WV, and secondary control survey winding (6) is connected with voltage measurement switch (7), it is characterized in that: the secondary neutral of three-phase transformer (2) is earth-free; Zero sequential potential transformer second protection winding (9) connects specified voltage between phases recording voltmeter (8), and neutral point of a winding of zero sequential potential transformer (10) polar end and voltage transformer (VT) is connected and follows and simulate single busbar earth fault device (11) secondary ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120130485U CN202133724U (en) | 2011-04-28 | 2011-04-28 | Error test device of zero sequence voltage transformers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120130485U CN202133724U (en) | 2011-04-28 | 2011-04-28 | Error test device of zero sequence voltage transformers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202133724U true CN202133724U (en) | 2012-02-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120130485U Expired - Fee Related CN202133724U (en) | 2011-04-28 | 2011-04-28 | Error test device of zero sequence voltage transformers |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202133724U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616657A (en) * | 2013-12-02 | 2014-03-05 | 国家电网公司 | Method for testing single-interval current transformer |
| CN103630831A (en) * | 2012-08-29 | 2014-03-12 | 上海宝钢工业技术服务有限公司 | Verification system of grounding direction protective relay |
| CZ305577B6 (en) * | 2014-11-28 | 2015-12-16 | České Vysoké Učení Technické V Praze Fakulta Elektrotechnická | Device to test control transformers |
-
2011
- 2011-04-28 CN CN201120130485U patent/CN202133724U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103630831A (en) * | 2012-08-29 | 2014-03-12 | 上海宝钢工业技术服务有限公司 | Verification system of grounding direction protective relay |
| CN103630831B (en) * | 2012-08-29 | 2017-08-25 | 上海宝钢工业技术服务有限公司 | The check system of grounding direction protective relay |
| CN103616657A (en) * | 2013-12-02 | 2014-03-05 | 国家电网公司 | Method for testing single-interval current transformer |
| CZ305577B6 (en) * | 2014-11-28 | 2015-12-16 | České Vysoké Učení Technické V Praze Fakulta Elektrotechnická | Device to test control transformers |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120201 Termination date: 20180428 |