CN203368013U - Protection device for residual voltage of bus - Google Patents
Protection device for residual voltage of bus Download PDFInfo
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- CN203368013U CN203368013U CN 201320266103 CN201320266103U CN203368013U CN 203368013 U CN203368013 U CN 203368013U CN 201320266103 CN201320266103 CN 201320266103 CN 201320266103 U CN201320266103 U CN 201320266103U CN 203368013 U CN203368013 U CN 203368013U
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- protection device
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- measurement control
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Abstract
The utility model, which relates to the line protection technical field, provides a protection device for a residual voltage of a bus. The protection device is characterized in that the device comprises a rogowski coil connected to a branch circuit, a measurement control unit connected with the rogowski coil, a microcomputer integration protection device connected with the measurement control unit, and a current transformer connected with the microcomputer integration protection device. The measurement control unit and the microcomputer integration protection device are connected respectively by two output terminals. A current converter is connected between one output terminal of connection between the measurement control unit and the microcomputer integration protection device and the rogowski coil as well as the current transformer; and the current transformer is connected with branch circuits. The other terminal of connection between the measurement control unit and the microcomputer integration protection device is connected with the current converter by a current-limiting impedor; and the current-limiting impedor is connected with the current converter by a disconnecting switch. With the protection device, the residual voltage of the bus can be maintained; other loads can be protected from being influenced by a short-circuit fault of one branch; the provided protection device has all functions of a branch breaker; and the damage caused by the short-circuit current impact can be reduced.
Description
Technical field:
The utility model relates to the route protection technical field, specifically a kind of bus residual voltage protective device.
Background technology:
In the electric power system of a certain electric pressure of enterprises medium voltage network, if one branch road is short-circuited, on the bus be connected with this branch road, voltage can fall seriously suddenly, the voltage of bus remnants is generally lower than 20% of rated voltage, only have this branch breaker of working as to cut-off, after the excision short trouble, busbar voltage could be recovered.Busbar voltage is exactly the time that circuit breaker cut-offs short trouble from suddenly dropping to recovery during this period of time; greatly about about 0.1 second; time of computer integrated protection failure judgement (20ms～30ms) namely; add circuit breaker intrinsic operate time (40ms～80ms), add electric arc zero-crossing timing (16ms left and right).Enterprise is referred to as " shaking electric ".And shake between the electricity emergence period, the bus residual voltage is very low, and the load running of some faults that are not short-circuited is interrupted, and frequency converter, motor and relay etc., can badly influence production.
The utility model content:
Technical problem to be solved in the utility model is to provide a kind of bus residual voltage that not only maintains, and protects other load not to be subject to the impact of a branch, short-circuit fault, and has the bus residual voltage protective device of the repertoire of branch breaker.
Technical problem to be solved in the utility model adopts following technical scheme to realize:
A kind of bus residual voltage protective device, it is characterized in that: comprise the Rogowski coil be connected on branch road, the measurement and control unit be connected with Rogowski coil, the computer integrated protection be connected with measurement and control unit, the current transformer be connected with computer integrated protection, described measurement and control unit is connected by two outputs respectively with computer integrated protection, one of them output and Rogowski coil that measurement and control unit is connected with computer integrated protection, and be connected with converter between current transformer, be connected with a minute branch road on current transformer, another output be connected with computer integrated protection at measurement and control unit is connected with converter by current-limiting impedance, one end of current-limiting impedance is connected with converter by disconnecting switch.
The utility model measurement and control unit monitors branch current by Rogowski coil, when short circuit current is greater than set point, measurement and control unit can be in 1～2 millisecond the effective value that dopes three-phase current of fast accurate, and send actuating signal, converter can be in 2～3 milliseconds quick-speed turning on-off, short circuit current enters in the current limliting high impedance.Limiting short-circuit current, the amplitude of short circuit current reduces greatly.The utility model can be in 6～16 milliseconds of the faults of being short-circuited, and the bus residual voltage remains on more than 95% of rated voltage, has guaranteed the normal operation of other fault-free branch road sensitive loads, and the suffered short-circuit impact of equipment such as main transformer reduces greatly simultaneously.After short trouble excision on minute branch road, a converter order immediately when measurement and control unit detection branch electric current approaches rated current, the current limliting high impedance is released in 10 milliseconds, and system can be recovered normal operation.The branch road of the fault that is short-circuited is in being short-circuited over 300 milliseconds, fault is not removed, the utility model measurement and control unit is thought the vacuum circuit-breaker tripping that divides branch road of fault point or the fault of bus, can send the separating brake order to disconnecting switch immediately, and excision is to branch road.The Quick eddy drive unit can shorten its switching time greatly, thereby can eliminate fast fault.
The beneficial effects of the utility model are: the utility model is reasonable in design; not only maintain the bus residual voltage; protect other load not to be subject to the impact of a branch, short-circuit fault, there is the repertoire of branch breaker, can reduce short-circuit current rush and produce the harm brought.
The accompanying drawing explanation:
Fig. 1 is the utility model principle schematic.
Embodiment:
For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.
As shown in Figure 1, a kind of bus residual voltage protective device, comprise the Rogowski coil be connected on branch road, the measurement and control unit be connected with Rogowski coil, the computer integrated protection be connected with measurement and control unit, the current transformer be connected with computer integrated protection, measurement and control unit is connected by two outputs respectively with computer integrated protection, one of them output and Rogowski coil that measurement and control unit is connected with computer integrated protection, and be connected with converter between current transformer, be connected with a minute branch road on current transformer, another output be connected with computer integrated protection at measurement and control unit is connected with converter by current-limiting impedance, one end of current-limiting impedance is connected with converter by disconnecting switch.
Above demonstration and described basic principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (1)
1. a bus residual voltage protective device, it is characterized in that: comprise the Rogowski coil be connected on branch road, the measurement and control unit be connected with Rogowski coil, the computer integrated protection be connected with measurement and control unit, the current transformer be connected with computer integrated protection, described measurement and control unit is connected by two outputs respectively with computer integrated protection, one of them output and Rogowski coil that measurement and control unit is connected with computer integrated protection, and be connected with converter between current transformer, be connected with a minute branch road on current transformer, another output be connected with computer integrated protection at measurement and control unit is connected with converter by current-limiting impedance, one end of current-limiting impedance is connected with converter by converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320266103 CN203368013U (en) | 2013-05-16 | 2013-05-16 | Protection device for residual voltage of bus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320266103 CN203368013U (en) | 2013-05-16 | 2013-05-16 | Protection device for residual voltage of bus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203368013U true CN203368013U (en) | 2013-12-25 |
Family
ID=49815732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320266103 Expired - Lifetime CN203368013U (en) | 2013-05-16 | 2013-05-16 | Protection device for residual voltage of bus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203368013U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098744A (en) * | 2014-11-18 | 2015-11-25 | 芜湖蓝宙电子科技有限公司 | Bus residual voltage maintenance device |
| CN106300231A (en) * | 2016-08-28 | 2017-01-04 | 安徽普天电力科技有限公司 | A kind of generator outlet high-pressure side current-limiting method |
-
2013
- 2013-05-16 CN CN 201320266103 patent/CN203368013U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098744A (en) * | 2014-11-18 | 2015-11-25 | 芜湖蓝宙电子科技有限公司 | Bus residual voltage maintenance device |
| CN106300231A (en) * | 2016-08-28 | 2017-01-04 | 安徽普天电力科技有限公司 | A kind of generator outlet high-pressure side current-limiting method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: No. 28 Jinhua Avenue Shuangfeng Industrial Zone, Changfeng County of Hefei City, Anhui province 231100 Patentee after: ANHUI HEKAI ELECTRICAL TECHNOLOGY CO.,LTD. Address before: No. 28 Jinhua Avenue Shuangfeng Industrial Zone, Changfeng County of Hefei City, Anhui province 231100 Patentee before: Anhui Guoke Electric Power Equipment Co.,Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20131225 |
|
| CX01 | Expiry of patent term |