CN103812098A - Current transformer secondary open circuit protection device - Google Patents
Current transformer secondary open circuit protection device Download PDFInfo
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- CN103812098A CN103812098A CN201210449719.4A CN201210449719A CN103812098A CN 103812098 A CN103812098 A CN 103812098A CN 201210449719 A CN201210449719 A CN 201210449719A CN 103812098 A CN103812098 A CN 103812098A
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- open circuit
- current transformer
- instrument transformer
- normally closed
- control board
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Abstract
The invention provides a current transformer secondary open circuit protection device. The current transformer secondary open circuit protection device comprises an upper insulation cover, a PCB control board and a lower insulation cover, wherein the PCB control board is welded with a load terminal, a normally closed/normally open switch, an indicating lamp and a transformer terminal, wherein the load terminal is connected with a load, the transformer terminal is connected with a transformer, when the normally closed/normally open switch is in a normally closed state, the transformer is directly connected with the load, when the normally closed/normally open switch is in a normally open state, two ends of the transformer are conducted. The current transformer secondary open circuit protection device is simple to operate, the two ends of the current transformer are conducted only through employing the normally closed/normally open switch, after the two ends of the current transformer are confirmed to conduct, wiring operation on the current transformer can be carried out safely.
Description
Technical field
The present invention relates to power domain, relate in particular to a kind of protective device of high-low pressure current transformer.
Background technology
Current transformer is a kind of electric component of extensive use, can act on the electic protection that detects electric current in alternating current circuit and use.Its principle is that large electric current is converted to little electric current to scale, the less electric current of regulation ratio conversion is offered to various meterings, relaying protection and automatics use.In this process, it isolates electrical secondary system and high voltage installation, thereby guarantees the person and device security.Current transformer be in operation secondary side do not allow open circuit; once secondary side open circuit; just can produce very high voltage, jeopardize personal safety, affect the operation of metering, protective device and electronic load; cause secondary insulating to puncture; and making the supersaturation of current transformer magnetic circuit, iron core heating, burns out current transformer; also possibility initiation fire, causes a serious accident.Though have many kinds of measures to avoid the generation of open circuit accident at present, as power operation, or instrument transformer is pulled down to the modes such as wiring again, but power equipment be in operation can not power-off and instrument transformer is pulled down complexity limited to these measures and all can not well implement.
Therefore design a kind of be used for protecting the person and device security, not only succinct but also reliably second open circuit protector of current mutual inductor become the problem of needing solution in current industry badly.
Summary of the invention
The object of the present invention is to provide a kind of second open circuit protector of current mutual inductor.
Correspondingly; a kind of second open circuit protector of current mutual inductor of the present invention; comprise insulation upper cover, PCB control board and insulation lower cover; on described PCB control board, be welded with face terminals, normally closed normal open switch, indicator light and instrument transformer terminal, described face terminals is connected with load, and described instrument transformer connecting terminals is connected to instrument transformer; normally closed normal open switch is in the time of normally off; instrument transformer is directly connected with load, and normally closed normal open switch is in the time of normally open, and instrument transformer two ends are connected.
As a further improvement on the present invention, in described insulation, cover and be provided with switch resigning hole, indicator light resigning hole, face terminals installing hole and instrument transformer terminal installing hole.
As a further improvement on the present invention, under described insulation, be covered with cavity and be positioned at some support columns of cavity.
As a further improvement on the present invention, in described insulation, be covered with wiring hole, described insulation upper cover uses screw locking at support column by wiring hole.
As a further improvement on the present invention, described PCB control board is provided with location hole, and described PCB control board uses screw locking at support column by location hole.
The invention has the beneficial effects as follows: simple to operate, only need to use normally closed normal open switch, by the conducting of current transformer two ends, confirm, after the conducting of current transformer two ends, just can carry out wiring operation to current transformer safely.
Accompanying drawing explanation
Figure 1 shows that the three-dimensional exploded view of an embodiment of the present invention second open circuit protector of current mutual inductor;
Fig. 2 A is depicted as the circuit theory diagrams of normally closed normal open switch under normally off;
Fig. 2 B is depicted as the circuit theory diagrams of normally closed normal open switch under normally open.
Embodiment
Describe the present invention below with reference to embodiment shown in the drawings.But these execution modes do not limit the present invention, the conversion in structure, method or function that those of ordinary skill in the art makes according to these execution modes is all included in protection scope of the present invention.
Shown in A, Fig. 2 B, an embodiment of the present invention second open circuit protector of current mutual inductor comprises insulation upper cover 1, PCB control board 2 and insulation lower cover 3 as shown in Figure 1, Figure 2.
Insulation upper cover 1 sidewall is provided with some wiring holes 11, and top is provided with switch resigning hole 12, indicator light resigning hole 13, face terminals installing hole 14 and instrument transformer terminal installing hole 15.Insulation lower cover 3 comprises cavity 31 and is positioned at some support columns 32 of cavity 31, and support column 32 is provided with screw thread, and the bottom of insulation lower cover 3 is provided with the guide-track groove (not shown) for installing.PCB control board 2 is welded with face terminals 21, normally closed normal open switch 22, indicator light 23 and instrument transformer terminal 24 above, and in addition, the side of PCB control board 2 is provided with some location holes 25.
When concrete installation, first face terminals 21, normally closed normal open switch 22, indicator light 23 and instrument transformer terminal 24 are welded on PCB control board 2, then PCB control board 2 is put into the cavity 31 of insulation lower cover 3, be locked on the support column 32 in insulation lower cover 3 by the some location holes 25 use screws 4 on PCB control board 2, thereby realize fixing PCB control board 2; Then insulation upper cover 1 is placed on insulation lower cover 3, be locked on the support column 32 in insulation lower cover 3 by the some wiring holes 11 use screws 4 on insulation upper cover 1, thereby realize fixing insulation upper cover 1, now, face terminals 21 is installed on face terminals installing hole 14, instrument transformer terminal 24 is installed on instrument transformer terminal installing hole 15, and normally closed normal open switch 22 is positioned at switch resigning hole 12, and indicator light 23 is positioned at indicator light resigning hole 13; Finally this protective device is installed on to DIN35mm standard guide rail (not shown) upper, thereby realizes fixing this protective device.
When concrete operations, load is accessed to face terminals 21, current transformer access instrument transformer terminal 24, realizes by operating normally closed normal open switch 22 defencive function of avoiding Current Transformer Secondary side open circuit.In the time that switch is kept closed with the conducting of current transformer S1 end, instrument transformer is directly connected with load, and instrument transformer keeps normal work.When operating personnel need to change current transformer or change when circuit, toggle switch or while being stirred by automatics control switch, switch is connected instrument transformer S1 with S2 two ends, thus avoiding the instrument transformer phenomenon of opening a way, can operate instrument transformer safely.
Second open circuit protector of current mutual inductor of the present invention has following beneficial effect:
1. simple to operate, only need to use normally closed normal open switch, by current transformer two ends S1 and S2 conducting, confirm, after the conducting of current transformer two ends, just can carry out wiring operation to current transformer safely, realize the second open circuit protection to current transformer;
2. can accomplish can normal running in when energising, meets load and do not allow the job requirement of power operation; Simple for structure reliable, greatly reduce manufacturing cost;
3. single-phase, threephase load be can be widely used in, list, multichannel loading also can be applicable to;
4. between current transformer and normally closed normal open switch, be provided with indicator light, by the whether conducting of the light confirmation current transformer of indicator light two ends, thereby allow operating personnel can see more intuitively running status, after guaranteeing that on off state is correct, then current transformer is carried out to wiring operation.
Be to be understood that, although this specification is described according to execution mode, but be not that each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should make specification as a whole, technical scheme in each execution mode also can, through appropriately combined, form other execution modes that it will be appreciated by those skilled in the art that.
Listed a series of detailed description is above only illustrating for feasibility execution mode of the present invention; they are not in order to limit the scope of the invention, all do not depart from the equivalent execution mode that skill spirit of the present invention does or change and all should be included in protection scope of the present invention within.
Claims (5)
1. a second open circuit protector of current mutual inductor; it is characterized in that: comprise insulation upper cover, PCB control board and insulation lower cover; on described PCB control board, be welded with face terminals, normally closed normal open switch, indicator light and instrument transformer terminal; described face terminals is connected with load; described instrument transformer connecting terminals is connected to instrument transformer, and normally closed normal open switch is in the time of normally off, and instrument transformer is directly connected with load; normally closed normal open switch is in the time of normally open, and instrument transformer two ends are connected.
2. second open circuit protector of current mutual inductor according to claim 1, is characterized in that: in described insulation, cover and be provided with switch resigning hole, indicator light resigning hole, face terminals installing hole and instrument transformer terminal installing hole.
3. second open circuit protector of current mutual inductor according to claim 2, is characterized in that: under described insulation, be covered with cavity and be positioned at some support columns of cavity.
4. second open circuit protector of current mutual inductor according to claim 3, is characterized in that: in described insulation, be covered with wiring hole, described insulation upper cover uses screw locking at support column by wiring hole.
5. second open circuit protector of current mutual inductor according to claim 4, is characterized in that: described PCB control board is provided with location hole, and described PCB control board uses screw locking at support column by location hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210449719.4A CN103812098B (en) | 2012-11-12 | 2012-11-12 | Second open circuit protector of current mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210449719.4A CN103812098B (en) | 2012-11-12 | 2012-11-12 | Second open circuit protector of current mutual inductor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103812098A true CN103812098A (en) | 2014-05-21 |
| CN103812098B CN103812098B (en) | 2016-08-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210449719.4A Expired - Fee Related CN103812098B (en) | 2012-11-12 | 2012-11-12 | Second open circuit protector of current mutual inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103812098B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510863A (en) * | 2016-01-20 | 2016-04-20 | 国网上海市电力公司 | Short-circuiting system and short-circuiting method of secondary terminal of mutual inductor |
| CN105510679A (en) * | 2016-01-21 | 2016-04-20 | 江苏省电力公司电力科学研究院 | High-reliability and high-precision current measuring method and device |
| CN110716075A (en) * | 2019-10-10 | 2020-01-21 | 西安科技大学 | Current transformer array switching circuit and control method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2279725Y (en) * | 1994-10-16 | 1998-04-22 | 陆秀根 | Emergency protector for current transformer |
| CN201142567Y (en) * | 2007-12-13 | 2008-10-29 | 广州霍斯通电气有限公司 | Secondary side open circuit protecting equipment of current mutual inductor |
| WO2009047748A2 (en) * | 2007-10-11 | 2009-04-16 | Israel Electric Corporation | Open circuit in secondary winding protection for current transformers |
| JP2010154631A (en) * | 2008-12-25 | 2010-07-08 | Chugoku Electric Power Co Inc:The | Device for preventing opening of secondary circuit in current transformer for measuring instrument |
| CN101840776A (en) * | 2010-05-31 | 2010-09-22 | 中国西电电气股份有限公司 | Secondary open-circuit over-voltage protection device of current mutual inductor |
| CN202872359U (en) * | 2012-11-12 | 2013-04-10 | 苏州工业园区新宏博通讯科技有限公司 | Secondary open circuit protector of current transformer |
-
2012
- 2012-11-12 CN CN201210449719.4A patent/CN103812098B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2279725Y (en) * | 1994-10-16 | 1998-04-22 | 陆秀根 | Emergency protector for current transformer |
| WO2009047748A2 (en) * | 2007-10-11 | 2009-04-16 | Israel Electric Corporation | Open circuit in secondary winding protection for current transformers |
| CN201142567Y (en) * | 2007-12-13 | 2008-10-29 | 广州霍斯通电气有限公司 | Secondary side open circuit protecting equipment of current mutual inductor |
| JP2010154631A (en) * | 2008-12-25 | 2010-07-08 | Chugoku Electric Power Co Inc:The | Device for preventing opening of secondary circuit in current transformer for measuring instrument |
| CN101840776A (en) * | 2010-05-31 | 2010-09-22 | 中国西电电气股份有限公司 | Secondary open-circuit over-voltage protection device of current mutual inductor |
| CN202872359U (en) * | 2012-11-12 | 2013-04-10 | 苏州工业园区新宏博通讯科技有限公司 | Secondary open circuit protector of current transformer |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510863A (en) * | 2016-01-20 | 2016-04-20 | 国网上海市电力公司 | Short-circuiting system and short-circuiting method of secondary terminal of mutual inductor |
| CN105510679A (en) * | 2016-01-21 | 2016-04-20 | 江苏省电力公司电力科学研究院 | High-reliability and high-precision current measuring method and device |
| CN110716075A (en) * | 2019-10-10 | 2020-01-21 | 西安科技大学 | Current transformer array switching circuit and control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103812098B (en) | 2016-08-03 |
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Address after: 215126 Suzhou City Industrial Park, Suzhou, Su Sheng Tung Road, Hong Kong Street, No. 88 Applicant after: SUZHOU NEWHONGBO INTELLIGENT TECHNOLOGY CO., LTD. Address before: 215126 Suzhou City Industrial Park, Suzhou, Su Sheng Tung Road, Hong Kong Street, No. 88 Applicant before: Suzhou Industrial Prak New Hongbo Communication Technology Co., Ltd. |
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Granted publication date: 20160803 Termination date: 20201112 |