CN202616758U - Over-voltage protective equipment of current mutual inductor - Google Patents
Over-voltage protective equipment of current mutual inductor Download PDFInfo
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- CN202616758U CN202616758U CN 201220280400 CN201220280400U CN202616758U CN 202616758 U CN202616758 U CN 202616758U CN 201220280400 CN201220280400 CN 201220280400 CN 201220280400 U CN201220280400 U CN 201220280400U CN 202616758 U CN202616758 U CN 202616758U
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Abstract
The utility model provides over-voltage protective equipment of a current mutual inductor, which comprises a sampling unit, a main control unit, a display unit and an open circuit protection action element, wherein the sampling unit acquires a current signal on the secondary side of the current mutual inductor, converts the current signal into a voltage signal, and transmits the voltage signal to the main control unit; the main control unit makes a judgment, when a condition of secondary side open circuit of a current mutual inductor is met, the open circuit protection action element is started, and judgment and control data is transmitted to the display unit. A power supply unit comprising an open circuit power supply module, a normal power supply module and a high-capacity battery, as well as a voltage limiting protection unit is also provided. The over-voltage protective equipment adopts intelligent control and a mechanical switch to achieve open circuit protection, and avoids influence of heating of electric elements on the whole circuit in the prior art.
Description
Technical field
The utility model relates to the protective circuit of a kind of current transformer when open circuit, is specifically related to a kind of current transformer over-pressure safety device.
Background technology
Current transformer damaged the instrument transformers except producing a large amount of iron loss in when open circuit, also induced dangerous high pressure at the secondary winding, jeopardized personal safety, and therefore, charged Current Transformer Secondary side winding is forbidden open circuit operation.Take place in order to prevent that the current transformer open circuit is unexpected; Prior art does; The modes that adopt analog circuit and electronic devices and components to build are developed all kinds of current transformer over-pressure safety devices more; Problem is: adopt the Realization of Analog Circuit open-circuit-protection, can't realize intelligent the setting for problems such as the grade of protecting voltage and timing nodes; The electronic switch with open circuit protecting function that adopts electronic devices and components to build very easily produces the heating phenomenon when instrument transformer secondary side loop current is excessive, cause adverse effect for the stable operation of current transformer and accessory circuit thereof.
Summary of the invention
In order to overcome the above-mentioned defective under the prior art; The utility model provides a kind of current transformer over-pressure safety device; Adopt intelligent control method; Utilize the condition intelligent decision of setting whether to get into protection, adopt mechanical switch to accomplish open-circuit-protection simultaneously, avoided the influence that the heating of the electronic switch of electronic devices and components formation causes entire circuit under the prior art.
The technical scheme that the utility model adopts is: a kind of current transformer over-pressure safety device; Comprise: comprising: sampling unit, main control unit, display unit, voltage-limiting protection circuit and open-circuit-protection action element; The signal input part of said sampling unit connects the loop of Current Transformer Secondary side; The signal output part of said sampling unit connects the sample port of said main control unit; The control port of said main control unit connects the control input end of said open-circuit-protection action element; The input of said voltage-limiting protection circuit connects said Current Transformer Secondary side loop, and the lead-out terminal of said open-circuit-protection action element is connected between the lead-out terminal of said current transformer, and said main control unit data output end connects the data input pin of said display unit.
Said open-circuit-protection action element is that operating point is the relay of mechanical structure.
Said relay is pulsed magnetic latching relay.
Said main control unit is a single-chip microcomputer.
Also be provided with power supply unit, said power supply unit connects the power input of said main control unit.
Said power supply unit comprises the open circuit supply module that is used for power supply when said Current Transformer Secondary side is opened a way, and is used for the normal power supply module and the reserve supply module of power supply when said Current Transformer Secondary side is closed.
Said open circuit supply module comprises that order connects rectification circuit, filter circuit and voltage stabilizing circuit, and the output of said voltage stabilizing circuit connects the power input of said main control unit.
Said voltage-limiting protection unit is two-way TVS pipe.
Said normal power supply module comprises miniature current mode power supply winding, rectification circuit, filter circuit and the voltage stabilizing circuit that order connects; Said miniature current mode power supply winding is wrapped on the lead-out terminal of said current transformer; It is input as the secondary side of said current transformer; The input of output connecting circuit plate rectifier bridge, the output of said voltage stabilizing circuit connects the power input of said main control unit.
Said reserve supply module is the high power capacity lithium battery that is built in circuit board.
The beneficial effect of the utility model is: owing to be provided with main control unit as judging whether the Current Transformer Secondary side is in the device of open-circuit condition; Owing to be provided with the on off operating mode of main control unit control open-circuit-protection action element, make and realized intellectuality for the level setting of protection voltage and for the setting of problems such as timing node; Because the protection step switch of the relay that adopts is a mechanical structure, for the electronic switch that other electronic device constitutes, solved and be in the heating problem under the big current conditions in the loop, working stability is reliable.
Description of drawings
Fig. 1 is the sketch map of a kind of embodiment of the utility model.
Embodiment
Referring to Fig. 1; A kind of current transformer over-pressure safety device; Comprise: sampling unit 7, single-chip microcomputer 10, display unit 5, two-way TVS pipe 11 and magnetic latching relay 1; The signal input part of said sampling unit 7 connects the loop of Current Transformer Secondary side; The signal output part of said sampling unit 7 connects the sample port of said single-chip microcomputer 10, and the control port of said single-chip microcomputer 10 connects the control input end of said magnetic latching relay 1, and the input of said two-way TVS pipe 11 connects said Current Transformer Secondary side loop; The lead-out terminal of said magnetic latching relay 1 is connected between the lead-out terminal of said current transformer, and said single-chip microcomputer 10 data output ends connect the data input pin of said display unit 5.Said sampling unit 7 is gathered the current signal of Current Transformer Secondary side; Convert current signal into voltage signal and pass to said single-chip microcomputer 10; Said single-chip microcomputer 10 is through judging; When satisfying Current Transformer Secondary side open-circuit condition, start magnetic latching relay 1 work, and judgment data is exported to display unit 5.Owing to adopted single-chip microcomputer as judging whether the Current Transformer Secondary side is in the device of open-circuit condition; And adopted aptitude manner to control the on off operating mode of open-circuit-protection action element; Make for the level setting of protecting voltage, and realized intellectuality for the setting of problems such as timing node.Adopt relay to accomplish open circuit protecting function, its protection step switch is a mechanical structure, for the electronic switch that other electronic device constitutes, has solved in the loop to be in the heating problem under the big current conditions, and working stability is reliable.Said two-way TVS pipe 11, when the Current Transformer Secondary side occurred damaging the superhigh pressure of components and parts, said two-way TVS managed 11 conductings, constituted the clamping protection loop.Relay is pulsed said magnetic latching relay, and for the electric latching relay of level triggers, the power consumption under circuit is in running order is less.
Also be provided with power supply unit, said power supply unit comprises the open circuit supply module that is used for power supply when said Current Transformer Secondary side is opened a way, and is used for the normal power supply module and the reserve supply module of power supply when said Current Transformer Secondary side is closed.
Said open circuit supply module comprises that order connects rectification circuit 2, filter circuit 3 and voltage stabilizing circuit 4, and the output of said voltage stabilizing circuit 4 connects the power input of said host scm 10.When the Current Transformer Secondary side loop was opened a way, the high pressure of generation provided electric current for said rectification circuit 2, said filter circuit 3 and the said voltage stabilizing circuit 4 that order connects, and said voltage stabilizing circuit 4 provides direct current energy for said single-chip microcomputer 10.
Said normal power supply module comprises miniature current mode power supply winding 6, rectification circuit 8, filter circuit 9 and the voltage stabilizing circuit 4 that order connects; Said miniature current mode power supply winding 6 is wrapped on the lead-out terminal of said current transformer; It is input as the secondary side of said current transformer; Respond to the electric current of the secondary side of said current transformer, output connects the input of rectification circuit 8, and the output of said voltage stabilizing circuit 4 connects the power input of said single-chip microcomputer 10.When Current Transformer Secondary side loop operate as normal; Said miniature current mode power supply winding 6 exports induced current to said rectification circuit 8, said filter circuit 9 and said voltage stabilizing circuit 4 that order connects; For said single-chip microcomputer 10 provides direct current energy, said miniature current mode power supply winding 6 when the Current Transformer Secondary side loop is opened a way because of there not being streaming current not work.Current mode power supply winding can be common current mode power supply winding, and accuracy is not had very high request, mainly is to accomplish the power taking function, and for the ease of installing, said current mode power supply winding is preferably miniature current mode power supply winding.
The lithium battery 12 that said power supply unit also is provided with high power capacity is power supply in support, and the output of said lithium battery 12 is connected in the power input of said single-chip microcomputer 10, under the situation that current transformer is not worked or electric current is too small by said lithium battery 12 power supplies.
The utility model has adopted the low-power consumption processing, and quiescent dissipation is less than 10uA.Effectively practiced thrift the electric energy of built-in high power capacity lithium battery under the situation of no externally fed.
Leakage current was minimum when the utility model normally moved, and was high-impedance state; When abnormal overvoltage took place, protector can be according to the pressure limiting of set point snap action, time-delay short circuit with protective current instrument transformer and personal safety.
Claims (10)
1. current transformer over-pressure safety device; It is characterized in that comprising: sampling unit, main control unit, display unit, voltage-limiting protection circuit and open-circuit-protection action element; The signal input part of said sampling unit connects the loop of Current Transformer Secondary side; The signal output part of said sampling unit connects the sample port of said main control unit; The control port of said main control unit connects the control input end of said open-circuit-protection action element; The input of said voltage-limiting protection circuit connects said Current Transformer Secondary side loop, and the lead-out terminal of said open-circuit-protection action element is connected between the lead-out terminal of said current transformer, and said main control unit data output end connects the data input pin of said display unit.
2. current transformer over-pressure safety device according to claim 1 is characterized in that said open-circuit-protection action element is that operating point is the relay of mechanical structure.
3. current transformer over-pressure safety device according to claim 2 is characterized in that said relay is pulsed magnetic latching relay.
4. current transformer over-pressure safety device according to claim 3 is characterized in that said main control unit is a single-chip microcomputer.
5. current transformer over-pressure safety device according to claim 1 is characterized in that also being provided with power supply unit, and said power supply unit connects the power input of said main control unit.
6. according to claim 1,2,3,4 or 5 described current transformer over-pressure safety devices; It is characterized in that said power supply unit comprises the open circuit supply module that is used for power supply when said Current Transformer Secondary side is opened a way, and is used for the normal power supply module and the reserve supply module of power supply when said Current Transformer Secondary side is closed.
7. current transformer over-pressure safety device according to claim 6; It is characterized in that said open circuit supply module comprises that order connects rectification circuit, filter circuit and voltage stabilizing circuit, the output of said voltage stabilizing circuit connects the power input of said main control unit.
8. current transformer over-pressure safety device as claimed in claim 1 is characterized in that said voltage-limiting protection unit is two-way TVS pipe.
9. current transformer over-pressure safety device according to claim 6; It is characterized in that said normal power supply module comprises miniature current mode power supply winding, rectification circuit, filter circuit and voltage stabilizing circuit that order connects; Said miniature current mode power supply winding is wrapped on the lead-out terminal of said current transformer; It is input as the secondary side of said current transformer; The input of output connecting circuit plate rectifier bridge, the output of said voltage stabilizing circuit connects the power input of said main control unit.
10. current transformer over-pressure safety device according to claim 6 is characterized in that said reserve supply module is the high power capacity lithium battery that is built in circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220280400 CN202616758U (en) | 2012-06-14 | 2012-06-14 | Over-voltage protective equipment of current mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220280400 CN202616758U (en) | 2012-06-14 | 2012-06-14 | Over-voltage protective equipment of current mutual inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202616758U true CN202616758U (en) | 2012-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220280400 Expired - Fee Related CN202616758U (en) | 2012-06-14 | 2012-06-14 | Over-voltage protective equipment of current mutual inductor |
Country Status (1)
| Country | Link |
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| CN (1) | CN202616758U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103762557A (en) * | 2014-01-03 | 2014-04-30 | 山东华信电气股份有限公司 | Device and method for open-circuit-resistant protection of current transformer |
| CN104078963A (en) * | 2014-06-11 | 2014-10-01 | 安徽三和电力技术有限公司 | Secondary open circuit protection device for current mutual inductor |
| CN106684820A (en) * | 2016-11-09 | 2017-05-17 | 国网天津市电力公司 | Open circuit automatic protection device for secondary circuit of high voltage current transformer |
| CN113740792A (en) * | 2021-08-27 | 2021-12-03 | 保定北特电气设备制造有限公司 | Electric leakage metering system and method after secondary open circuit of current transformer |
-
2012
- 2012-06-14 CN CN 201220280400 patent/CN202616758U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103762557A (en) * | 2014-01-03 | 2014-04-30 | 山东华信电气股份有限公司 | Device and method for open-circuit-resistant protection of current transformer |
| CN103762557B (en) * | 2014-01-03 | 2016-08-17 | 山东华信电气股份有限公司 | The anti-open-circuit-protection method of current transformer |
| CN104078963A (en) * | 2014-06-11 | 2014-10-01 | 安徽三和电力技术有限公司 | Secondary open circuit protection device for current mutual inductor |
| CN106684820A (en) * | 2016-11-09 | 2017-05-17 | 国网天津市电力公司 | Open circuit automatic protection device for secondary circuit of high voltage current transformer |
| CN113740792A (en) * | 2021-08-27 | 2021-12-03 | 保定北特电气设备制造有限公司 | Electric leakage metering system and method after secondary open circuit of current transformer |
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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: 20121219 Termination date: 20190614 |
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| CF01 | Termination of patent right due to non-payment of annual fee |