CN205427682U - A controlling means for adjusting current transformer transformation ratio of taking a percentage more - Google Patents

A controlling means for adjusting current transformer transformation ratio of taking a percentage more Download PDF

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Publication number
CN205427682U
CN205427682U CN201620161986.5U CN201620161986U CN205427682U CN 205427682 U CN205427682 U CN 205427682U CN 201620161986 U CN201620161986 U CN 201620161986U CN 205427682 U CN205427682 U CN 205427682U
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CN
China
Prior art keywords
divider resistance
voltage
circuit
current transformer
outfan
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Expired - Fee Related
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CN201620161986.5U
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Chinese (zh)
Inventor
徐春营
王云
齐金伟
陈鉴庆
熊海强
舒恋
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Nanchang Power Supply Branch Of State Grid Jiangxi Electric Power Co
State Grid Liaoning Electric Power Co Ltd
Original Assignee
Nanchang Power Supply Branch Of State Grid Jiangxi Electric Power Co
State Grid Liaoning Electric Power Co Ltd
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Application filed by Nanchang Power Supply Branch Of State Grid Jiangxi Electric Power Co, State Grid Liaoning Electric Power Co Ltd filed Critical Nanchang Power Supply Branch Of State Grid Jiangxi Electric Power Co
Priority to CN201620161986.5U priority Critical patent/CN205427682U/en
Application granted granted Critical
Publication of CN205427682U publication Critical patent/CN205427682U/en
Expired - Fee Related legal-status Critical Current
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Abstract

The utility model relates to a current transformer technical field that is correlated with is a controlling means for adjusting current transformer transformation ratio of taking a percentage more, and it includes that coupling draw -out power supply and transformation ratio switch control circuit, and coupling draw -out power supply can the unit including getting, rectification filter circuit and voltage conversion circuit, get can the unit the output be connected with rectification filter circuit's input, rectification filter circuit's output is connected with voltage conversion circuit's input. The utility model discloses a coupling draw -out power supply not only provides the power but also can real -time supervision be surveyed the electric current size for the transformation ratio switches control circuit, further switches control circuit adjustment current transformer transformation ratio through the transformation ratio, adopts the emitter follower who has the positive feedback than switching control circuit, and the break -make through the control triode changes resistive voltage divider and compares, constitutes the positive feedback, makes voltage comparater upset back status pole for stable.

Description

A kind of control device for adjusting multi-tap current transformer ratio
Technical field
This utility model relates to current transformer correlative technology field, a kind of control device for adjusting multi-tap current transformer ratio, and the no-load voltage ratio being mainly used in adjusting wide-range multi-tap current transformer automatically switches.
Background technology
Development along with power system, in high precision, the current transformer of wide-range is widely used in the fields such as operation of power networks status monitoring, multi-tap current transformer is for having same iron core and a winding, Secondary Winding is then divided into the winding that multiple number of turn is different, the most independent, to meet different no-load voltage ratios under same load current conditions, the needs of different class of accuracy.
At present, multi-tap current transformer is when power network monitoring, monitor each tap correspondence modulate circuit output signal frequently with multiple acquisition channels simultaneously, when primary side current less not less than lower range passage range time, for improve certainty of measurement choose lower range channel data as sampled data;High range channel data is chosen as sampled data when primary side current is larger than lower range passage range;Which makes monitoring device power consumption be greatly increased, and causes the significant wastage of data acquisition unit hardware resource.
Summary of the invention
The purpose of this utility model is, problem is adjusted for multi-tap current transformer ratio in prior art, propose a kind of control device for adjusting multi-tap current transformer ratio, whether exceed the current range of current transformer according to tested bus current size and realize the automatic switchover of no-load voltage ratio.
The technical solution of the utility model is: a kind of control device for adjusting multi-tap current transformer ratio, including coupling energy taking power supply and no-load voltage ratio control switching circuit, coupling energy taking power supply includes taking energy unit, current rectifying and wave filtering circuit and voltage conversion circuit, take and can be connected with the input of current rectifying and wave filtering circuit by the outfan of unit, the outfan of current rectifying and wave filtering circuit is connected with the input of voltage conversion circuit, no-load voltage ratio control switching circuit includes protective resistance, first divider resistance, second divider resistance, 3rd divider resistance, adjustable 4th divider resistance of resistance value, first pull-up resistor, NPN audion, electric capacity of voltage regulation, voltage comparator, optocoupler, fly-wheel diode and relay;nullRelay is connected with current transformer winding,One end of protective resistance is connected with rectification filter circuit output end respectively and the first divider resistance connects,The other end of protective resistance negative pole end with relay and fly-wheel diode respectively is connected,The positive terminal of fly-wheel diode is connected with optocoupler and relay respectively,One end of first pull-up resistor is connected with the outfan of voltage conversion circuit,The other end of the first pull-up resistor is connected with optocoupler,The other end of the first divider resistance with respectively with the second divider resistance、The negative pole end of voltage comparator and the positive terminal of electric capacity of voltage regulation connect,The other end of the second divider resistance is connected with the negative pole end of electric capacity of voltage regulation and ground connection,One end of 3rd divider resistance is connected with colelctor electrode and the voltage conversion circuit outfan of NPN audion respectively,The other end of the 3rd divider resistance is connected with emitter stage and the 4th divider resistance of NPN audion respectively,The other end ground connection of the 4th divider resistance,The resistance adjustment end of the 4th divider resistance is connected with the positive terminal of voltage comparator,One end of second pull-up resistor is connected with voltage conversion circuit outfan,The other end of the second pull-up resistor is connected with the base stage of NPN audion and the outfan of voltage comparator respectively.
Further optimization and/or improvements to technical solutions of the utility model are presented herein below:
Above-mentioned voltage conversion circuit includes overvoltage crowbar and DC/DC module, and the outfan of current rectifying and wave filtering circuit is connected with the input of overvoltage crowbar, and the outfan of overvoltage crowbar is connected with the input of DC/DC module.
Above-mentioned coupling energy taking power supply also includes that two-way Transient Suppression Diode, two-way Transient Suppression Diode are connected in parallel with the two ends of the input of current rectifying and wave filtering circuit.
The utility model has the advantages that and use the emitter follower with positive feedback, electric resistance partial pressure ratio is changed by the break-make controlling audion, constitute positive feedback, after making voltage comparator upset, state is the most stable, solve divider resistance in prior art than for relay during fixed value near threshold voltage setting value because tested current fluctuation causes the technical barrier that frequently switches.
Accompanying drawing explanation
Fig. 1 is to control apparatus system block diagram.
Fig. 2 is no-load voltage ratio control switching circuit figure.
Fig. 3 is embodiment one coupling energy taking power supply architecture block diagram.
Fig. 4 is voltage conversion circuit figure.
Fig. 5 is embodiment two coupling energy taking power supply architecture block diagram.
nullCoding in accompanying drawing is respectively as follows: 1 for current transformer measuring unit,2 is no-load voltage ratio control switching circuit,3 is coupling energy taking unit,201 is relay,202 is control relay circuit,301 for taking energy unit,302 is current rectifying and wave filtering circuit,303 is voltage conversion circuit,304 is two-way Transient Suppression Diode,R1 is protective resistance,R2 is the first pull-up resistor,R3 the first divider resistance,R4 is the second divider resistance,R5 is the 3rd divider resistance,R6 is the 4th divider resistance,R7 is the second pull-up resistor,C1 is electric capacity of voltage regulation,U1 is optocoupler,Q1 is NPN audion,U2 is voltage comparator,VCC is voltage conversion circuit outfan,JGND is simulation ground,GND is digitally,3031 is overvoltage crowbar,3032 is DC/DC module.
Detailed description of the invention
The utility model is described in more detail with embodiment below in conjunction with the accompanying drawings.
Embodiment one
It is illustrated in figure 1 control apparatus system block diagram.Control device and include coupling energy taking power supply 3 and no-load voltage ratio control switching circuit 2, no-load voltage ratio control switching circuit 2 is connected with current transformer measuring unit 1 by relay, the A end of current transformer measuring unit 1 and C terminate in the follow-up modulate circuit of current transformer, the normally closed electric shock A-B point of relay is connected with A end, the B end of current transformer measuring unit 1 respectively, now the secondary coil A-B of current transformer measuring unit 1 is shorted, and secondary coil B-C accesses modulate circuit circuit;When no-load voltage ratio control switching circuit 2 actuating of relay, normally closed electric shock A-B point disconnects, and secondary coil A-C accesses modulate circuit circuit.Coupling energy taking power supply 3 provides power supply supply for no-load voltage ratio control switching circuit 2 and can monitor tested size of current in real time.
It is illustrated in figure 2 no-load voltage ratio control switching circuit figure.No-load voltage ratio control switching circuit 2 includes protective resistance R1, the first divider resistance R3, the second divider resistance R4, the 3rd divider resistance R5, the adjustable 4th divider resistance R6 of resistance value, first pull-up resistor R2, NPN audion Q1, electric capacity of voltage regulation C1, voltage comparator U2, optocoupler U1, sustained diode 1 and relay 201.In the present embodiment, voltage conversion circuit output voltage is 5V, i.e. VCC voltage is 5V, and the 3rd divider resistance R5 is 10K Ω, and the 4th divider resistance R6 is 10K Ω, when tested electric current is less, voltage comparator U2 output open circuit, secondary coil B-C accesses circuit, and NPN audion Q1 base stage turns on, 3rd divider resistance R5 is shorted, and voltage comparator in-phase voltage input is 2.5V;When tested electric current is bigger, voltage comparator reverse voltage input is more than 2.5V, voltage comparator U2 overturns, and optocoupler U1 turns on, relay 201 action, secondary coil A-B accesses circuit, NPN audion Q1 base stage is ended, and the 3rd divider resistance R5 accesses circuit, and voltage comparator U2 in-phase voltage input is 1.25V, after making voltage comparator U2 upset, state is the most stable, constitutes positive feedback;Otherwise, when voltage comparator U2 reverse voltage input is less than 1.25V, voltage comparator U2 output open circuit.
It is illustrated in figure 3 coupling energy taking power supply architecture block diagram.Coupling energy taking power supply 3 includes taking energy unit 301, current rectifying and wave filtering circuit 302 and voltage conversion circuit 303.Take and by iron core and can take and can constitute by coil by unit 301, iron core sleeve is contained on tested current bus bar, take energy coil uniformly around being placed on iron core, according to electromagnetic induction principle, take and can induce AC electromotive force by coil, rectified filter circuit 302 and voltage conversion circuit 303 export 5V voltage, power for no-load voltage ratio control switching circuit 2.Additionally, current rectifying and wave filtering circuit 302 outfan is connected with the first divider resistance R3 of no-load voltage ratio control switching circuit 2, reflects tested size of current in real time, the most dynamically adjust the no-load voltage ratio of current transformer.
It is illustrated in figure 4 voltage conversion circuit figure.Voltage conversion circuit 303 includes overvoltage crowbar 3031 and DC/DC module 3032, and the outfan of current rectifying and wave filtering circuit 302 is connected with the input of overvoltage crowbar 3031, and the outfan of overvoltage crowbar 3031 is connected with the input of DC/DC module 3032.When overvoltage crowbar 3031 detects its input voltage more than setting value; disconnect subsequent conditioning circuit; for protecting subsequent conditioning circuit to use voltage-dropping type voltage conversion device from the destruction of transient overvoltage, DC/DC module 3032, voltage output is adjusted to no-load voltage ratio control switching circuit required voltage.
Embodiment two
It is illustrated in figure 5 the present embodiment coupling energy taking power supply architecture block diagram.Compared with embodiment one, coupling energy taking power supply 3 also includes that two-way Transient Suppression Diode 304, two-way Transient Suppression Diode 304 are connected in parallel with the two ends of the input of current rectifying and wave filtering circuit 302.When take can the AC electromotive force that induces of coil overvoltage occurs time two-way Transient Suppression Diode 304 high impedance at the two poles of the earth is become Low ESR; absorb surge power; make the voltage clamp of two interpolars in a predetermined value, prevent from being destroyed by excessive instantaneous voltage or disturbing puncturing, protect subsequent conditioning circuit.
Above technical characteristic constitutes most preferred embodiment of the present utility model; it has stronger adaptability and optimal implementation result; can increase and decrease non-essential technical characteristic according to actual needs, meet the demand of different situations, these broadly fall into protection domain of the present utility model.Therefore, the protection domain of this utility model patent should be as the criterion with claims.

Claims (3)

1. the control device being used for adjusting multi-tap current transformer ratio, including coupling energy taking power supply and no-load voltage ratio control switching circuit, coupling energy taking power supply includes taking energy unit, current rectifying and wave filtering circuit and voltage conversion circuit, take and can be connected with the input of current rectifying and wave filtering circuit by the outfan of unit, the outfan of current rectifying and wave filtering circuit is connected with the input of voltage conversion circuit, it is characterized in that, no-load voltage ratio control switching circuit includes protective resistance, first divider resistance, second divider resistance, 3rd divider resistance, adjustable 4th divider resistance of resistance value, first pull-up resistor, NPN audion, electric capacity of voltage regulation, voltage comparator, optocoupler, fly-wheel diode and relay;nullRelay is connected with current transformer winding,One end of protective resistance is connected with rectification filter circuit output end respectively and the first divider resistance connects,The other end of protective resistance negative pole end with relay and fly-wheel diode respectively is connected,The positive terminal of fly-wheel diode is connected with optocoupler and relay respectively,One end of first pull-up resistor is connected with the outfan of voltage conversion circuit,The other end of the first pull-up resistor is connected with optocoupler,The other end of the first divider resistance with respectively with the second divider resistance、The negative pole end of voltage comparator and the positive terminal of electric capacity of voltage regulation connect,The other end of the second divider resistance is connected with the negative pole end of electric capacity of voltage regulation and ground connection,One end of 3rd divider resistance is connected with colelctor electrode and the voltage conversion circuit outfan of NPN audion respectively,The other end of the 3rd divider resistance is connected with emitter stage and the 4th divider resistance of NPN audion respectively,The other end ground connection of the 4th divider resistance,The resistance adjustment end of the 4th divider resistance is connected with the positive terminal of voltage comparator,One end of second pull-up resistor is connected with voltage conversion circuit outfan,The other end of the second pull-up resistor is connected with the base stage of NPN audion and the outfan of voltage comparator respectively.
Control device for adjusting multi-tap current transformer ratio the most according to claim 1; it is characterized in that; voltage conversion circuit includes overvoltage crowbar and DC/DC module; the outfan of current rectifying and wave filtering circuit is connected with the input of overvoltage crowbar, and the outfan of overvoltage crowbar is connected with the input of DC/DC module.
Control device for adjusting multi-tap current transformer ratio the most according to claim 1 and 2, it is characterized in that, coupling energy taking power supply also includes that two-way Transient Suppression Diode, two-way Transient Suppression Diode are connected in parallel with the two ends of the input of current rectifying and wave filtering circuit.
CN201620161986.5U 2016-03-03 2016-03-03 A controlling means for adjusting current transformer transformation ratio of taking a percentage more Expired - Fee Related CN205427682U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108548971A (en) * 2018-04-04 2018-09-18 成都信息工程大学 A kind of electrical appliance on-line monitoring equipment and system
CN109270337A (en) * 2018-12-06 2019-01-25 石家庄杰泰特动力能源有限公司 Passive and wireless current sensor based on double-winding current mutual inductor
CN110658368A (en) * 2019-09-24 2020-01-07 深圳供电局有限公司 Residual current detection device and residual current action protection system
CN110908285A (en) * 2019-12-10 2020-03-24 国网山西省电力公司长治供电公司 Adaptive control system of composite transformation ratio current transformer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108548971A (en) * 2018-04-04 2018-09-18 成都信息工程大学 A kind of electrical appliance on-line monitoring equipment and system
CN108548971B (en) * 2018-04-04 2023-12-01 成都信息工程大学 Online monitoring equipment and system for electrical appliances
CN109270337A (en) * 2018-12-06 2019-01-25 石家庄杰泰特动力能源有限公司 Passive and wireless current sensor based on double-winding current mutual inductor
CN110658368A (en) * 2019-09-24 2020-01-07 深圳供电局有限公司 Residual current detection device and residual current action protection system
CN110658368B (en) * 2019-09-24 2022-09-02 深圳供电局有限公司 Residual current detection device and residual current action protection system
CN110908285A (en) * 2019-12-10 2020-03-24 国网山西省电力公司长治供电公司 Adaptive control system of composite transformation ratio current transformer

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CF01 Termination of patent right due to non-payment of annual fee
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Granted publication date: 20160803

Termination date: 20170303