CN202797942U - Secondary over-voltage protector of current transformer - Google Patents
Secondary over-voltage protector of current transformer Download PDFInfo
- Publication number
- CN202797942U CN202797942U CN 201220436296 CN201220436296U CN202797942U CN 202797942 U CN202797942 U CN 202797942U CN 201220436296 CN201220436296 CN 201220436296 CN 201220436296 U CN201220436296 U CN 201220436296U CN 202797942 U CN202797942 U CN 202797942U
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- CN
- China
- Prior art keywords
- current transformer
- contact
- protection device
- overvoltage protection
- transformer secondary
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a secondary over-voltage protector of a current transformer. The protector comprises a case and a printed circuit board (PCB), wherein the PCB is provided with a basic voltage-limiting component and a remote communication relay, and the basic voltage-limiting component is a zinc oxide voltage dependent resistor; and the case is further provided with a color indicating hole, two secondary coil contacts connected with the current transformer, a voltage limiting protection circuit contact and a remote communication relay contact.
Description
Technical field
The utility model belongs to the electric power electric field, refers to especially a kind of Current Transformer Secondary overvoltage protection device.
Background technology
In electric power system, current transformer (CT) is the little electric current that large electric current is become regulation, is widely used in one-shot measurement, control and protection.It is the requisite kit of ammeter, kilowatt-hour meter and current control system.During the current transformer normal operation; secondary side place (current transformer secondary coil both sides) is in approximate short-circuit condition; output voltage is very low; if but the secondary winding open circuit that is in operation; or a winding flows through abnormal current (such as the thunderbolt electric current; resonance current; the capacitor charging electric current; inductance starting current etc.); will produce at secondary side the overvoltage of thousands of volts even volts up to ten thousand; not only insulation works the mischief to electrical secondary system for this; also can make the too drastic and scaling loss of current transformer; even the life security that jeopardizes the staff, therefore generally be to adopt the Current Transformer Secondary overvoltage protection device to prevent that the current transformer overvoltage from producing in electric power system.
The Current Transformer Secondary overvoltage protection device is for above-mentioned situation, be applied to the Current Transformer Secondary side differential winding, overcurrent winding, measure winding, bus protection winding, winding for subsequent use etc.
The existing employed Current Transformer Secondary overvoltage protection device of technology, the running parameter of this class overvoltage protection device is unstable and produce easily the overvoltage protection misoperation.And the existing Current Transformer Secondary overvoltage protection device that uses is disposable device; and overvoltage protector generally is installed in the switch cubicle; fault detect and change very inconveniently also is difficult to see distinguishing mark after the protection action occurs, and be inconvenient to concentrate supervision and manages.
The utility model content
The purpose of this utility model provides a kind of technology, can guarantee the overvoltage protection misoperation can not occur when non-harmfulness overvoltage, and indication is provided after the protection action occurs and reports to the police, and is convenient to monitor and manages and overvoltage protection device that can Reusability.
The utility model is achieved through the following technical solutions:
A kind of Current Transformer Secondary overvoltage protection device includes housing, and circuit board has basic pressure limiting components and parts and distant news relay on the described circuit board, and described basic pressure limiting components and parts are Zinc-oxide piezoresistor; Also include the variable color indicator hole on described housing, described variable color indicator hole is connected with basic pressure limiting components and parts; Two connection current transformer secondary coil contacts, pressure limited protection circuit contact and distant news relay tips also having overvoltage protection device at described shell.
The contact of described pressure limited protection circuit is three.
The beneficial effects of the utility model are:
1. by the technical program, overvoltage protection device can effectively prevent the accident that occurs because of Current Transformer Secondary side overvoltage.
2. the overvoltage protection device of the technical program is after the starting protection action, and the variable color of simultaneously variable color indicator hole is convenient to monitor and management.
Description of drawings
Fig. 1 the utility model structural representation;
Fig. 2 the utility model side structure schematic diagram.
1. housing 2. voltage indicator lamps 3. variable color indicator hole 4.K1 interfaces
5.K2 interface 6. protective circuit NO contacts 7. protective circuit NM contacts
8. protective circuit NC contact 9. distant news relay tips
Embodiment
Below in conjunction with accompanying drawing concrete mode of the present utility model is elaborated, embodiment of the present utility model is exemplary, only can not be interpreted as it is to restriction of the present utility model for explaining content of the present utility model.
The utility model is achieved through the following technical solutions:
As depicted in figs. 1 and 2, a kind of Current Transformer Secondary overvoltage protection device includes housing 1, circuit board, and voltage indicator lamp 2 has basic pressure limiting components and parts and distant news relay on the described circuit board, and described basic pressure limiting components and parts are Zinc-oxide piezoresistor; On described housing, also include variable color indicator hole 3; Also have two connection current transformer secondary coil contact K1 contacts 4 and the K2 contact 5 of overvoltage protection device at described shell, the pressure limited protection circuit contact includes the NO contact, NM contact and NC contact, distant news relay tip 9; The contact of described pressure limited protection circuit is three.
The technical solution of the utility model realizes by following working method:
The Current Transformer Secondary overvoltage protection device is mainly single winding and adopts novel Zinc-oxide piezoresistor as basic pressure limiting element; when protector is worked, be connected to the secondary winding two ends by its contact K1 and K2 and be connected on the Current Transformer Secondary side; when Current Transformer Secondary side voltage peak is no more than 150V; the leakage current that flows into overvoltage protection device is no more than 0.1A; this value is much smaller than Current Transformer Secondary side maximum current; thereby in normal operation; protective circuit contact NM keeps connecting with contact NC; and keep opening circuit with contact NO, do not affect the work of current transformer.But when abnormal current is flow through in secondary winding in current transformer or primary circuit; the overvoltage that produces in the Current Transformer Secondary side is higher than its normal working voltage far away; the protection relay of overvoltage protection device K1 and K2 contact inside is with K1 and the short circuit of K2 contact at this moment; protective circuit contact NM disconnects with contact NC simultaneously; thereby protective circuit contact NM connects with contact NO and realizes protection, and distant news relay tip 9 is connected with the pressure limited protection circuit contact and cooperated other circuit outwards to transmit fault message simultaneously.
The described overvoltage protection device of technical solutions of the utility model can also use as other overvoltage protection such as semiconductor device etc.
Described above is implementation technical scheme of the present utility model and operation principle, and those skilled in the art improves according to the technical program certainly, and this improvement still belongs to the protection range of the technical program.
Claims (2)
1. a Current Transformer Secondary overvoltage protection device includes housing, and circuit board is characterized in that: basic pressure limiting components and parts and distant news relay are arranged on the described circuit board, and described basic pressure limiting components and parts are Zinc-oxide piezoresistor; Also include the variable color indicator hole on described housing, described variable color indicator hole is connected with basic pressure limiting components and parts; Two connection current transformer secondary coil contacts, pressure limited protection circuit contact and distant news relay tips also having overvoltage protection device at described shell.
2. a kind of Current Transformer Secondary overvoltage protection device according to claim 1, it is characterized in that: the contact of described pressure limited protection circuit is three.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220436296 CN202797942U (en) | 2012-08-30 | 2012-08-30 | Secondary over-voltage protector of current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220436296 CN202797942U (en) | 2012-08-30 | 2012-08-30 | Secondary over-voltage protector of current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202797942U true CN202797942U (en) | 2013-03-13 |
Family
ID=47825118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220436296 Expired - Fee Related CN202797942U (en) | 2012-08-30 | 2012-08-30 | Secondary over-voltage protector of current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202797942U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868459A (en) * | 2015-06-01 | 2015-08-26 | 安徽禄讯电子科技有限公司 | Secondary overvoltage protector for current transformer |
-
2012
- 2012-08-30 CN CN 201220436296 patent/CN202797942U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868459A (en) * | 2015-06-01 | 2015-08-26 | 安徽禄讯电子科技有限公司 | Secondary overvoltage protector for current transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20151123 Address after: 315100 Zhejiang city of Ningbo province Yinzhou District Yunlong Town Road No. 229 cloud Patentee after: NINGBO DEWO INTELLIGENT CO., LTD. Address before: 315135, Ningbo, Zhejiang province Yinzhou District Yunlong Town Mei Chi Industrial Zone Patentee before: Ningbo Dwoo Electric Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20170830 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |