CN203056573U - Secondary overvoltage protector for current transformer - Google Patents
Secondary overvoltage protector for current transformer Download PDFInfo
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- CN203056573U CN203056573U CN 201320003368 CN201320003368U CN203056573U CN 203056573 U CN203056573 U CN 203056573U CN 201320003368 CN201320003368 CN 201320003368 CN 201320003368 U CN201320003368 U CN 201320003368U CN 203056573 U CN203056573 U CN 203056573U
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- current transformer
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- control element
- protection device
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Abstract
The utility model discloses a secondary overvoltage protector for a current transformer. The secondary overvoltage protector comprises a bidirectional silicon controlled rectifier and a bidirectional trigger diode; wherein two ends of the bidirectional trigger diode are respectively connected with a control electrode G and a T2 electrode of the bidirectional silicon controlled rectifier, and a secondary coil of the current transformer is respectively connected with T1 and T2 ends of the silicon controlled rectifier. The secondary overvoltage protector has the advantages that the secondary overvoltage protector does not need an external power supply, the size is small in, the cost is low, the secondary overvoltage protector can be automatically reset, and the like.
Description
Technical field
The utility model relates to the superpotential protector of a kind of restriction Current Transformer Secondary coil.
Background technology
Existing Current Transformer Secondary overvoltage protection device (hereinafter to be referred as protector) is achieved in that when transducer detects Current Transformer Secondary coil-end voltage above set point; drive relay contact closure; with the Current Transformer Secondary coil short; eliminate the overvoltage at its two ends, protection equipment and personal safety.When having served as loss of voltage, need manual reset, current transformer could recover operate as normal.Owing to drive the power supply that relay needs externally fed, often several protectors to be done together, a power supply is for several protector work.Need line between protector and the current transformer like this.Not so power line will be sent to every protector, and line can not reduce equally.Because line increases, and influences reliability, outward appearance, and increase flat cost usefulness.Present transformer station is unattended mostly, because after instantaneous overvoltage caused protector action, nobody carried out reset operation, causes current transformer to be in disabled state for a long time, influence metering and protection.Because the actuating of relay all needs the time, from overvoltage taking place to relay contact closure, certain time-delay is arranged, overvoltage continues for some time always, has potential safety hazard.Because the relay volume is big, cost is high, have any problem so popularize again.
Summary of the invention
The purpose of this utility model provides a kind of Current Transformer Secondary overvoltage protection device, to solve the secondary overvoltage protection device without external power source, technical problem such as action is fast, volume is little, with low cost and automatically reset.
In order to realize the foregoing invention purpose, the utility model adopts following technical scheme:
A kind of Current Transformer Secondary overvoltage protection device is made up of bidirectional triode thyristor and bidirectional trigger diode; The two ends of bidirectional trigger diode are connected with the T2 utmost point with the control utmost point G of bidirectional triode thyristor respectively, and the secondary coil of current transformer is connected with the T2 two ends with the T1 of bidirectional triode thyristor respectively.
Described a kind of Current Transformer Secondary overvoltage protection device; Bidirectional trigger diode is that two-way transient state suppresses oppositely reverse any in unidirectional Transient Suppression Diode, piezo-resistance, discharge tube or the breakdown diode of butt joint of voltage-stabiliser tubes, two of butt joint of two utmost points, two.
Described a kind of Current Transformer Secondary overvoltage protection device; Behind the luminous tube LED of reverse parallel connection or luminous tube LED and general-purpose diode reverse parallel connection, the controllable silicon that is connected on the control utmost point G of bidirectional triode thyristor triggers in the loop.
Described a kind of Current Transformer Secondary overvoltage protection device; With a reverse parallel connection among the luminous tube LED of the input of light-dependent control element GK and described reverse parallel connection, be connected on and trigger in the loop, overvoltage signal is by the output K1 of light-dependent control element, and the K2 end is sent.
Described a kind of Current Transformer Secondary overvoltage protection device; Former limit by an isolating transformer T is connected in the described triggering loop, and is in parallel with grid, the source electrode of filter capacitor C, resistance R, voltage-stabiliser tube W and field effect transistor NMOS behind pair limit serial connection rectifier diode Z; The negative pole of rectifier diode Z is connected with the grid G of field effect transistor NMOS, and the Fu Bianfei serial connection rectifier diode end of isolating transformer T is connected with the source S of NMOS; Overvoltage signal is sent from source S and the drain electrode d end of field effect transistor NMOS.Use the PMOS field effect transistor as long as the direction of rectifier diode Z and voltage-stabiliser tube W is changed.
Described a kind of Current Transformer Secondary overvoltage protection device; The rectifier bridge ac input end of being made up of four rectifier diode Z is serially connected in the described triggering loop, is attempted by the dc output end of rectifier bridge behind the input series aiding connection of luminous tube LED and light-dependent control element GK.The positive pole of luminous tube LED is connected with the cathode output end of rectifier bridge.Overvoltage signal is by the output K1 of light-dependent control element GK, and the K2 end is sent.
A kind of Current Transformer Secondary overvoltage protection device is connected in the bidirectional triode thyristor TRIAC summation current transformer secondary coil C2 loop by the former limit of isolating transformer T.Pay behind the limit series connection rectifier diode in parallel with the input of filter capacitor C and light-dependent control element GK, the negative pole of rectifier diode connects the positive pole of light-dependent control element input, and the non-serial connection rectifier diode end that isolating transformer T pays the limit is connected with the negative pole of light-dependent control element input.Overvoltage signal is from the output K1 of light-dependent control element GK, and K2 holds output.
A kind of Current Transformer Secondary overvoltage protection device is made up of unidirectional controllable silicon S CR and diac D; Two groups of excess voltage protections are formed, two groups of excess voltage protection reverse parallel connections respectively at being connected with control utmost point G with the anode A of two unidirectional controllable silicon S CR in the two ends of two diac D; The secondary coil C2 of current transformer is connected on the anode A and negative electrode K of two unidirectional controllable silicon S CR.
A kind of Current Transformer Secondary overvoltage protection device is made up of solid-state relay, and the input and output side of solid-state relay is connected in parallel on Current Transformer Secondary coil C2 two ends.
The utility model has the advantages that: do not need external power source, protector can be directly installed on the terminal of Current Transformer Secondary coil C2, can also be encapsulated in current transformer inside; Response speed is fast, eliminates safe hidden trouble; Need not line, with low cost, installation labor and materials expense is low; When having served as loss of voltage, automatically reset, need not the manual reset operation, can also the output over-voltage signalling contact.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Fig. 2 is that another circuit theory of the present utility model is implemented illustration.
Fig. 3 is that the 3rd circuit theory of the present utility model implemented illustration.
Fig. 4 is that the 4th circuit theory of the present utility model implemented illustration.
Fig. 5 is that the 5th circuit theory of the present utility model implemented illustration.
Fig. 6 is that the 6th circuit theory of the present utility model implemented illustration.
Fig. 7 is the circuit theory diagrams of the overvoltage protection device of one-way SCR composition of the present utility model.
Fig. 8 is the circuit theory diagrams of the overvoltage protection device of solid-state relay composition of the present utility model.
Embodiment
Particular circuit configurations of the present utility model and operation principle are as follows:
TRIAC is bidirectional triode thyristor among Fig. 1, and D is the two-way trigger tube diode, and C2 is the secondary coil of current transformer.The two ends of bidirectional trigger diode D are connected with the T2 utmost point with the control utmost point G of bidirectional triode thyristor respectively, and the two ends of Current Transformer Secondary coil C2 are connected to the T1 utmost point and the T2 utmost point two ends of bidirectional triode thyristor.D among Fig. 1 can be two-way Transient Suppression Diode, two reverse voltage-stabiliser tubes of butt joint, two oppositely unidirectional Transient Suppression Diode, the piezo-resistances of butt joint, discharge tube, any in the breakdown diode (breakover diode).
LED among Fig. 2 is two luminous tubes.Two luminous tube LED(or a luminous tube LED and a general-purpose diode reverse parallel connection with reverse parallel connection) be connected on and trigger in the loop.When protector moved, luminous tube LED was luminous, showed the position at overvoltage current transformer place on the spot.
GK is light-dependent control element among Fig. 3.With input and the luminous tube LED reverse parallel connection of light-dependent control element GK, be connected on and trigger in the loop.When protector moved, luminous tube LED was luminous, indicated the position at overvoltage place on the spot, light-dependent control element GK conducting, and by K1, the K2 end is sent with overvoltage signal.This light-dependent control element can inhibit signal.Overvoltage later must manual reset.
T is isolating transformer among Fig. 4, and Z is rectifier diode, and C is filter capacitor, and R is resistance, and W is voltage-stabiliser tube, and NMOS is field effect transistor.The former limit of isolating transformer T is connected on triggers in the loop, pays behind the serial connection rectifier diode Z of limit and filter capacitor C, resistance R, the grid G of voltage-stabiliser tube W and field effect transistor NMOS and source S parallel connection.The negative pole of rectifier diode Z is connected with the grid G of field effect transistor NMOS, and the non-serial connection rectifier diode end of isolating transformer T is connected with the source S of NMOS and the positive pole of voltage stabilizing didoe.Overvoltage signal is sent from source S and the drain electrode d end of field effect transistor NMOS.Use the PMOS field effect transistor as long as rectifier diode Z voltage-stabiliser tube W direction is changed.This mode can not inhibit signal.Overvoltage can automatically reset later.
The rectifier bridge ac input end of being made up of four rectifier diode Z among Fig. 5 is serially connected in silicon controlled and triggers in the loop, is attempted by the dc output end of rectifier bridge behind the input series aiding connection of LED and light-dependent control element GK.The positive pole of LED is connected with the cathode output end of rectifier bridge.Overvoltage signal is sent from light-dependent control element GK output K1 and K2 end.This light-dependent control element can inhibit signal.Fault later must manual reset.
The former limit of isolating transformer T is connected in the bidirectional triode thyristor TRIAC summation current transformer secondary coil C2 loop among Fig. 6, pay behind the limit series connection rectifier diode Z in parallelly with the input of filter capacitor C and light-dependent control element GK, the negative pole of rectifier diode Z is connected with the positive pole of light-dependent control element GK input.The non-serial connection rectifier diode Z end that isolating transformer T pays the limit is connected with the negative pole of light-dependent control element GK input, and overvoltage signal is from the output K1 of light-operated original paper, and K2 holds output.Use the light-dependent control element that exchanges input, rectifier diode Z and filter capacitor C among Fig. 6 can save, and the limit of paying of isolating transformer T directly connects light-dependent control element GK input.This light-dependent control element can not inhibit signal.Fault can automatically reset later.
SCR is one-way SCR among Fig. 7.The two ends of diac D are connected with control utmost point G with the anode A of unidirectional controllable silicon S CR.Two groups of unidirectional controllable silicon S CR manage the D reverse parallel connections with triggering two.The secondary coil C2 of current transformer is connected on the anode A and negative electrode K of unidirectional controllable silicon S CR.
SSR is solid-state relay among Fig. 8.Its input and output side is connected in parallel on Current Transformer Secondary coil C2 two ends.
Claims (7)
1. a Current Transformer Secondary overvoltage protection device is made up of bidirectional triode thyristor and bidirectional trigger diode; It is characterized in that the two ends of bidirectional trigger diode are connected with the T2 utmost point with the control utmost point G of bidirectional triode thyristor respectively, the secondary coil of current transformer is connected with the T2 two ends with the T1 of bidirectional triode thyristor respectively.
2. a kind of Current Transformer Secondary overvoltage protection device according to claim 1; It is characterized in that bidirectional trigger diode is oppositely reverse any in unidirectional Transient Suppression Diode, piezo-resistance, discharge tube or the breakdown diode of butt joint of voltage-stabiliser tubes, two of butt joint of two-way Transient Suppression Diode, two.
3. a kind of Current Transformer Secondary overvoltage protection device according to claim 1; It is characterized in that behind the luminous tube LED of reverse parallel connection or luminous tube LED and general-purpose diode reverse parallel connection, the controllable silicon that is connected on the control utmost point G of bidirectional triode thyristor triggers in the loop.
4. a kind of Current Transformer Secondary overvoltage protection device according to claim 3; It is characterized in that with a luminous tube LED reverse parallel connection among the luminous tube LED of the input of light-dependent control element GK and described reverse parallel connection, overvoltage signal is by the output K1 of light-dependent control element, K2 sends.
5. a kind of Current Transformer Secondary overvoltage protection device according to claim 3; It is characterized in that, be connected on described controllable silicon by the former limit of an isolating transformer T and trigger in the loop, pay behind the serial connection rectifier diode Z of limit in parallel with grid G, the source S of filter capacitor C, resistance R, voltage-stabiliser tube W and field effect transistor NMOS; The negative pole of rectifier diode Z is connected with the grid G of field effect transistor NMOS, and the non-serial connection rectifier diode end that isolating transformer T pays the limit is connected with the source electrode of field effect transistor NMOS and the positive pole of voltage stabilizing didoe; Overvoltage signal is from the source S of field effect transistor NMOS, and drain electrode d end is sent; As long as use the PMOS field effect transistor with rectifier diode Z, the transposing of voltage-stabiliser tube W direction gets final product.
6. a kind of Current Transformer Secondary overvoltage protection device according to claim 3; It is characterized in that the rectifier bridge interchange end of being made up of four rectifier diode Z is serially connected in the described triggering loop, is attempted by the dc output end of rectifier bridge behind the input series aiding connection of described luminous tube LED and light-dependent control element GK; The positive pole of luminous tube LED is connected with the cathode output end of rectifier bridge; Overvoltage signal is from light-operated original paper GK output K1, and K2 sends.
7. a kind of Current Transformer Secondary overvoltage protection device according to claim 3; It is characterized in that, the former limit of isolating transformer T is connected in the bidirectional triode thyristor TRIAC summation current transformer secondary coil C2 loop, pay behind the limit series connection rectifier diode Z in parallel with the input of filter capacitor C and light-dependent control element, the negative pole of rectifier diode connects the positive pole of light-dependent control element GK input, the non-serial connection rectifier diode Z end that isolating transformer T pays the limit is connected with the negative pole of light-dependent control element input, overvoltage signal is from the output K1 of light-dependent control element, and the K2 end is sent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320003368 CN203056573U (en) | 2013-01-05 | 2013-01-05 | Secondary overvoltage protector for current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320003368 CN203056573U (en) | 2013-01-05 | 2013-01-05 | Secondary overvoltage protector for current transformer |
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| Publication Number | Publication Date |
|---|---|
| CN203056573U true CN203056573U (en) | 2013-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320003368 Expired - Fee Related CN203056573U (en) | 2013-01-05 | 2013-01-05 | Secondary overvoltage protector for current transformer |
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| CN (1) | CN203056573U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103592517A (en) * | 2013-11-26 | 2014-02-19 | 中国船舶重工集团公司第七二二研究所 | Method and system for testing antenna impedance |
| CN103915832A (en) * | 2013-01-05 | 2014-07-09 | 张斌 | Secondary over-voltage protector of current transformer |
| CN107800198A (en) * | 2017-11-21 | 2018-03-13 | 中国电力科学研究院有限公司 | A kind of power supply and its control method for series compensation device power supply |
-
2013
- 2013-01-05 CN CN 201320003368 patent/CN203056573U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103915832A (en) * | 2013-01-05 | 2014-07-09 | 张斌 | Secondary over-voltage protector of current transformer |
| CN103915832B (en) * | 2013-01-05 | 2017-02-08 | 张斌 | Secondary over-voltage protector of current transformer |
| CN103592517A (en) * | 2013-11-26 | 2014-02-19 | 中国船舶重工集团公司第七二二研究所 | Method and system for testing antenna impedance |
| CN103592517B (en) * | 2013-11-26 | 2016-05-11 | 中国船舶重工集团公司第七二二研究所 | A kind of antenna impedance test macro and method |
| CN107800198A (en) * | 2017-11-21 | 2018-03-13 | 中国电力科学研究院有限公司 | A kind of power supply and its control method for series compensation device power supply |
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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: 20130710 Termination date: 20210105 |
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| CF01 | Termination of patent right due to non-payment of annual fee |