CN202678948U - Secondary circuit of incoming line relay protection device - Google Patents
Secondary circuit of incoming line relay protection device Download PDFInfo
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- CN202678948U CN202678948U CN 201220279138 CN201220279138U CN202678948U CN 202678948 U CN202678948 U CN 202678948U CN 201220279138 CN201220279138 CN 201220279138 CN 201220279138 U CN201220279138 U CN 201220279138U CN 202678948 U CN202678948 U CN 202678948U
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- 230000001681 protective effect Effects 0.000 claims description 24
- 230000035945 sensitivity Effects 0.000 abstract description 7
- 239000002131 composite material Substances 0.000 abstract description 3
- 230000001131 transforming effect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 230000001012 protector Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
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Abstract
The utility model provides an inlet wire relay protection device's secondary circuit, relay protection device current contact LJ is connected with parallelly connected inlet wire busbar voltage output contact YJ1, secondary busbar voltage output voltage contact YJ2, inlet wire busbar voltage output contact YJ1 connects clamp plate LP2, secondary busbar voltage output voltage contact YJ2 connects clamp plate LP3, clamp plate LP2 is connected with clamp plate LP1 after parallelly connected with clamp plate LP 3. The transformer substation inlet wire protection is performed in an OR relationship between the current fixed value YJ1 of the side and the fixed value YJ2 of the secondary composite voltage output of the power transformer, and then is performed in an AND relationship with the current fixed value of the inlet wire, and when the conditions are met, the protection acts to disconnect the breaker and cut off the fault line. Therefore, the problem of low overcurrent protection sensitivity in the incoming line protection of the transformer substation is solved, the correct action rate of the system reaches 100% when a short-circuit fault occurs, and the power supply safety is ensured.
Description
Technical field
The utility model belongs to the electric protective device field, relates in particular to a kind of secondary circuit for improving the sensitivity of inlet wire protective relaying device.
Background technology
At present, if protective relaying device sensitivity not enough (backup protection requires greater than 1.2, and main protection requires greater than 2) in tuning process is adopted and installed low-voltage or negative sequence voltage locking additional, solve the problem of protection sensitivity.
How to carry out the problem that voltage is selected but exist.Such as adjusting of certain transforming plant lead-in protective relaying device, its with bus not only be with outlet, also with many power transformers, incoming relay-protection had both required to make the backup protection of line, required again to do the backup protection of main transformer, the sensitivity of the two all will meet the demands.A difficult problem that so just has a voltage How to choose.Microcomputer inlet wire protective relaying device can only be selected a magnitude of voltage at present; it is the busbar voltage of choosing inlet wire; still select main transformer secondary side voltage, how to make the protective relaying device of inlet wire not only done the backup protection of outlet, but also the backup protection of making main transformer just become the problem that needs solve.
Summary of the invention
The utility model aims to provide a kind of simple, can effectively solve the low defective of overcurrent protection sensitivity that the transforming plant lead-in protection exists in tuning process, reduces failure rate, guarantees the secondary circuit of the inlet wire protective relaying device of power supply safety.
For this reason, the solution taked of the utility model is:
A kind of secondary circuit of inlet wire protective relaying device is at control bus input+KM and output
Be serially connected with successively closing switch KK, circuit breaker auxiliary contact DL and switch trip coil TQ between-the KM, the other end that is connected to the protective relaying device electric current contact LJ on control bus input+KM is connected between closing switch KK2 and the circuit breaker auxiliary contact DL by pressing plate LP1, it is characterized in that two inlet wire busbar voltage output contact YJ1, secondary bus Voltage-output voltage contact YJ2 in parallel of access and pressing plate LP2, the LP3 of two parallel connections between protective relaying device electric current contact LJ and pressing plate LP1; Protective relaying device electric current contact LJ is connected with inlet wire busbar voltage output contact YJ1, the secondary bus Voltage-output voltage contact YJ2 of parallel connection; inlet wire busbar voltage output contact YJ1 connects pressing plate LP2; secondary bus Voltage-output voltage contact YJ2 connects pressing plate LP3, is connected with pressing plate LP1 after pressing plate LP2 and the pressing plate LP3 parallel connection.
Basic principle of the present utility model and beneficial effect are:
The utility model is got the transforming plant lead-in protective relaying device voltage (being YJ1) of inlet wire bus; the power transformer secondary protector connects secondary bus voltage, exports by brace YJ2 as " composite voltage " with the definite value input protector and with this voltage.The definite value YJ2 that transforming plant lead-in protection is exported with this side voltage definite value YJ1 and power transformer secondary " composite voltage " carry out or relation; again with the current ration of inlet wire carry out with relation, after condition satisfies, the protection action; cut-off breaker cuts faulty line.Thereby eliminated the low problem of overcurrent protection sensitivity that exists in the transforming plant lead-in protection in tuning process, made system when short trouble occurring, performance factor reaches 100%, has guaranteed power supply safety.
Description of drawings
Accompanying drawing is the secondary circuit structure chart of inlet wire protective relaying device.
Among the figure :+KM is the control bus input, and-KM is the control bus output, and KK is closing switch, and DL is the circuit breaker auxiliary contact, and TQ is the switch trip coil, and LP1, LP2, LP3 are three pressing plates,
LJ is the protective relaying device electric current contact, and YJ1 is inlet wire busbar voltage output contact, and YJ2 is secondary bus Voltage-output voltage contact.
Embodiment
The secondary circuit of former inlet wire protective relaying device; be to be serially connected with successively closing switch KK, circuit breaker auxiliary contact DL and switch trip coil TQ between control bus input+KM and output-KM, the other end that is connected to the protective relaying device electric current contact LJ on control bus input+KM is connected between closing switch KK2 and the circuit breaker auxiliary contact DL by pressing plate LP1.
By accompanying drawing as seen; the secondary circuit of the utility model inlet wire protective relaying device; then be on the basis of primary circuit, again two inlet wire busbar voltage output contact YJ1, secondary bus Voltage-output voltage contact YJ2 in parallel of access and pressing plate LP2, the LP3 of two parallel connections between protective relaying device electric current contact LJ and pressing plate LP1.Concrete connected mode is: protective relaying device electric current contact LJ is connected with inlet wire busbar voltage output contact YJ1, the secondary bus Voltage-output voltage contact YJ2 of parallel connection; inlet wire busbar voltage output contact YJ1 connects pressing plate LP2; secondary bus Voltage-output voltage contact YJ2 connects pressing plate LP3, is connected with pressing plate LP1 after pressing plate LP2 and the pressing plate LP3 parallel connection again.
Claims (1)
1. the secondary circuit of an inlet wire protective relaying device, between control bus input+KM and output-KM, be serially connected with successively closing switch KK, circuit breaker auxiliary contact DL and switch trip coil TQ, the other end that is connected to the protective relaying device electric current contact LJ on control bus input+KM is connected between closing switch KK2 and the circuit breaker auxiliary contact DL by pressing plate LP1, it is characterized in that two inlet wire busbar voltage output contact YJ1 in parallel of access between protective relaying device electric current contact LJ and pressing plate LP1, the pressing plate LP2 of secondary bus Voltage-output voltage contact YJ2 and two parallel connections, LP3; Protective relaying device electric current contact LJ is connected with inlet wire busbar voltage output contact YJ1, the secondary bus Voltage-output voltage contact YJ2 of parallel connection; inlet wire busbar voltage output contact YJ1 connects pressing plate LP2; secondary bus Voltage-output voltage contact YJ2 connects pressing plate LP3, is connected with pressing plate LP1 after pressing plate LP2 and the pressing plate LP3 parallel connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220279138 CN202678948U (en) | 2012-06-14 | 2012-06-14 | Secondary circuit of incoming line relay protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220279138 CN202678948U (en) | 2012-06-14 | 2012-06-14 | Secondary circuit of incoming line relay protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202678948U true CN202678948U (en) | 2013-01-16 |
Family
ID=47499823
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220279138 Expired - Fee Related CN202678948U (en) | 2012-06-14 | 2012-06-14 | Secondary circuit of incoming line relay protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202678948U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375450A (en) * | 2015-11-19 | 2016-03-02 | 内蒙古电力勘测设计院有限责任公司 | Secondary circuit of fixed cabinet |
-
2012
- 2012-06-14 CN CN 201220279138 patent/CN202678948U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375450A (en) * | 2015-11-19 | 2016-03-02 | 内蒙古电力勘测设计院有限责任公司 | Secondary circuit of fixed cabinet |
| CN105375450B (en) * | 2015-11-19 | 2018-07-17 | 内蒙古电力勘测设计院有限责任公司 | A kind of fixed cabinet secondary circuit |
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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 |
Granted publication date: 20130116 Termination date: 20180614 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |