CN2465193Y - Automatic convertion measurer for composit rate changing current mutual inductor - Google Patents
Automatic convertion measurer for composit rate changing current mutual inductor Download PDFInfo
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- CN2465193Y CN2465193Y CN 01216155 CN01216155U CN2465193Y CN 2465193 Y CN2465193 Y CN 2465193Y CN 01216155 CN01216155 CN 01216155 CN 01216155 U CN01216155 U CN 01216155U CN 2465193 Y CN2465193 Y CN 2465193Y
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- circuit
- resistance
- current transformer
- output terminal
- diode
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Abstract
The utility model provides an automatic conversion measurer for composite rate changing current mutual inductors, which comprises an output terminal, and a watt-hour meter which is connected with a composite rate changing current mutual inductor by the output terminal. The utility model is additionally provided with a sampling circuit, a comparison circuit, a driving circuit, and a switching circuit, wherein, an input terminal of the sampling circuit is connected with a secondary terminal S< 1 > of the composite rate changing current mutual inductor; the output terminal of the sampling circuit is connected with the driving circuit by the comparison circuit; the switching circuit is respectively connected with the driving circuit and the composite rate changing current inductor by controlling. The utility model has the advantages that the utility model can automatically sample, compare, control, switch, and meter according to the amount of loads of electricity, the composite rate changing current mutual inductor is made to be in optimum working states, the metering is accurate, and the loss of electric charge can be avoided.
Description
The utility model provides a kind of compound transformation ratio current transformer automatic converting and metering device, belongs to the electric-power metering technical field.
In the present electric-power metering field, often the current transformer of the compound no-load voltage ratio of secondary is installed in the power circuit, the metering when being used for the power load instability is promptly measured with little no-load voltage ratio when underload, measures with large velocity ratio during high load capacity, improves measuring accuracy with this.But be in operation, have following problem:
1, the height of power load manually can not monitor and switch at any time, if high-tension current inductor is very dangerous;
2, could switch after having a power failure, cause switching untimely, do not catch up with the high and low variation of loading, and manual switching be loaded down with trivial details;
3, owing to switch untimelyly, when power load hour, current transformer may be in the operation of large velocity ratio state, little electric current metering misalignment, and when the circuit power load was high, current transformer was bordering on state of saturation again, caused the electricity consumption metering inaccurate.
The purpose of this utility model provides a kind ofly can overcome above-mentioned defective, carry out electric-power metering, the automatic converting and metering device of compound transformation ratio current transformer that measuring accuracy is high according to the height of power load.
The purpose of this utility model is achieved in that
Comprise that watt-hour meter connects the output terminal of compound transformation ratio current transformer, is characterized in that: set up sample circuit, comparator circuit, driving circuit and commutation circuit, wherein sample circuit meets the secondary terminal S of compound transformation ratio current transformer
1In the circuit, its output terminal connects driving circuit through comparator circuit, commutation circuit respectively with driving circuit and compound transformation ratio current transformer control linkage.
The automatic converting and metering device of described compound transformation ratio current transformer, sample circuit are a current transformer CT
3, one output head grounding, another output termination comparator circuit.
The automatic converting and metering device of described compound transformation ratio current transformer, comparator circuit comprises comparer IC
1: B, IC
1: C, resistance R
1～7, capacitor C
1～3With diode D
1～3, comparer IC wherein
1: the in-phase input end connecting resistance R of B
7With resistance R
6The bleeder circuit of forming, its inverting input meets comparer IC
1: the in-phase input end of C, and respectively through resistance R
2, capacitor C
3Ground connection, comparer IC
1: the inverting input connecting resistance R of C
4With resistance R
5The bleeder circuit of forming, its in-phase input end is also through resistance R
3Connect capacitor C respectively
1～2With diode D
1Negative pole, capacitor C
1～2Other end ground connection, diode D
1Positive pole meet current transformer CT
3Output terminal, and through resistance R
1Ground connection, comparer IC
1: B, IC
1: the output terminal correspondence of C is through diode D
2, diode D
3Connect driving circuit.
The automatic converting and metering device of described compound transformation ratio current transformer, driving circuit comprises rest-set flip-flop IC
2, diode D
4～5, capacitor C
7, resistance R
8～11, rejection gate IC
3～4With triode BG
1～2, capacitor C wherein
7An end ground connection, its other end rejection gate IC
3Input end, and through resistance R
11Meet power supply V
CC, rest-set flip-flop IC
2A signal input part respectively through diode D
5Meet rejection gate IC
3Output terminal, through resistance R
9Ground connection, through diode D
2Meet comparer IC
1: the output terminal of B, its another signal input part is through resistance R
8Ground connection and through diode D
3Meet comparer IC
1: the output terminal of C, rest-set flip-flop IC
2Output terminal Q meet rejection gate IC
4Input end, rejection gate IC
4Output terminal through resistance R
10Meet triode BG
1Base stage, triode BG
1～2Collector join after respectively through diode D
4, commutation circuit ground connection, triode BG
1Emitter meet triode BG
2Base stage, triode BG
2Emitter meet power supply V
CC
The automatic converting and metering device of described compound transformation ratio current transformer, commutation circuit comprises relay IC and normally closed contact JC thereof
1With normal opened contact JC
2, wherein relay J C is serially connected in triode BG
1～2Collector and ground between, its normally closed contact JC
1, normal opened contact JC
2Correspondence is serially connected in the S of compound transformation ratio current transformer
2, S
3In the circuit.
Its principle of work is: sample circuit is connected on the compound transformation ratio current transformer secondary terminal S on the power circuit
1In the circuit,, and output to comparator circuit by its induction power load signal.When sending electricity, the capacitor C in the driving circuit
7, resistance R
11With rejection gate IC
3To rest-set flip-flop IC
2Carry out initial reset, by rejection gate IC
3The output high level signal makes rest-set flip-flop IC
2Enter steady state (SS).Along with the increasing of power load, S
1When electric current reaches certain value in the circuit, comparer IC
1: C exports high level, makes rest-set flip-flop IC
2The output high level is through rejection gate IC
4Control triode BG
1～2Conducting makes the relay J C adhesive in the commutation circuit, normally closed contact JC
1Disconnection, normal opened contact JC
2Closure, i.e. S
2Circuit disconnects, S
3Line conduction makes compound transformation ratio current transformer operate in high load capacity metering state, and no-load voltage ratio switches to high load capacity and keeps.Along with the reducing of power load, S
1When electric current is reduced to certain value in the circuit, rejection gate IC
3Sampling output low level signal is to comparator circuit, by comparer IC
1: B exports high level, makes rest-set flip-flop IC
2Output low level is through rejection gate IC
4Control triode BG
1～2End, make the relay J C in the commutation circuit discharge normally closed contact JC
1Closed, normal opened contact JC
2Disconnect, i.e. S
3Circuit disconnects, S
2Line conduction makes compound transformation ratio current transformer operate in underload metering state, and no-load voltage ratio switches to underload and keeps, and finishes one from the underload electricity consumption to the high load capacity electricity consumption, got back to the transfer process of underload electricity consumption metering by the high load capacity electricity consumption again.
The utility model compared with prior art has following advantage: can sample, compare, control switching automatically, finish in the extremely short time, make compound transformation ratio current transformer be in optimum Working, accurate measurement avoids the electricity charge to run off.
Fig. 1 is a principle of work block diagram of the present utility model;
Fig. 2 is the circuit diagram of the utility model embodiment;
Below in conjunction with accompanying drawing the utility model is described further:
A, B, C are three-phase power line, are connected on compound transformation ratio current transformer on the power circuit by current transformer CT
1～2Form, its output termination watt-hour meter KWH is as the current transformer CT of sample circuit
3Meet the secondary terminal S of compound transformation ratio current transformer
1In the circuit, one output head grounding, another output termination comparator circuit.Relay J C is serially connected in triode BG
1～2Collector and ground between, its normally closed contact JC
1, normal opened contact JC
2Correspondence is serially connected in the S of compound transformation ratio current transformer
2, S
3In the circuit, triode BG
2Emitter meet power supply V
CC, its base stage meets triode BG
1Emitter, triode BG
1～2Collector join after also through diode D
4Ground connection, triode BG
1Base stage through resistance R
10Meet rejection gate IC
4Output terminal, rejection gate IC
4Input termination rest-set flip-flop IC
2The Q output terminal, rest-set flip-flop IC
2A signal input part respectively through diode D
5Meet rejection gate IC
3Output terminal, through resistance R
9Ground connection, through diode D
2Meet comparer IC
1: the output terminal of B, its another signal input part is through resistance R
8Ground connection and through diode D
3Meet comparer IC
1: the output terminal of C, comparer IC
1: the in-phase input end connecting resistance R of B
7With resistance R
6The bleeder circuit of forming, its inverting input meets comparer IC
1: the in-phase input end of C, and respectively through resistance R
2, capacitor C
3Ground connection, comparer IC
1: the inverting input connecting resistance R of C
4With resistance R
5The bleeder circuit of forming, its in-phase input end is also through resistance R
3Connect capacitor C respectively
1～2With diode D
1Negative pole, capacitor C
1～2Other end ground connection, diode D
1Positive pole meet current transformer CT
3Output terminal, and through resistance R
1Ground connection.
Claims (5)
1, the automatic converting and metering device of a kind of compound transformation ratio current transformer, comprise that watt-hour meter connects the output terminal of compound transformation ratio current transformer, it is characterized in that: set up sample circuit, comparator circuit, driving circuit and commutation circuit, wherein sample circuit meets the secondary terminal S of compound transformation ratio current transformer
1In the circuit, its output terminal connects driving circuit through comparator circuit, commutation circuit respectively with driving circuit and compound transformation ratio current transformer control linkage.
2, the automatic converting and metering device of compound transformation ratio current transformer as claimed in claim 1 is characterized in that: sample circuit is a current transformer CT
3, one output head grounding, another output termination comparator circuit.
3, the automatic converting and metering device of compound transformation ratio current transformer as claimed in claim 1, it is characterized in that: comparator circuit comprises comparer IC
1: B, IC
1: C, resistance R
1～7, capacitor C
1～3With diode D
1～3, comparer IC wherein
1: the in-phase input end connecting resistance R of B
7With resistance R
6The bleeder circuit of forming, its inverting input meets comparer IC
1: the in-phase input end of C, and respectively through resistance R
2, capacitor C
3Ground connection, comparer IC
1: the inverting input connecting resistance R of C
4With resistance R
5The bleeder circuit of forming, its in-phase input end is also through resistance R
3Connect capacitor C respectively
1～2With diode D
1Negative pole, capacitor C
1～2Other end ground connection, diode D
1Positive pole meet current transformer CT
3Output terminal, and through resistance R
1Ground connection, comparer IC
1: B, IC
1: the output terminal correspondence of C is through diode D
2, diode D
3Connect driving circuit.
4, the automatic converting and metering device of compound transformation ratio current transformer as claimed in claim 1, it is characterized in that: driving circuit comprises rest-set flip-flop IC
2, diode D
4-5, capacitor C
7, resistance R
8～11, rejection gate IC
3-4With triode BG
1～2, capacitor C wherein
7An end ground connection, its other end rejection gate IC
3Input end, and through resistance R
11Meet power supply V
CC, rest-set flip-flop IC
2A signal input part respectively through diode D
5Meet rejection gate IC
3Output terminal, through resistance R
9Ground connection, through diode D
2Meet comparer IC
1: the output terminal of B, its another signal input part is through resistance R
3Ground connection and through diode D
3Meet comparer IC
1: the output terminal of C, rest-set flip-flop IC
2Output terminal Q meet rejection gate IC
4Input end, rejection gate IC
4Output terminal through resistance R
10Meet triode BG
1Base stage, triode BG
1～2Collector join after respectively through diode D
4, commutation circuit ground connection, triode BG
1Emitter meet triode BG
2Base stage, triode BG
2Emitter meet power supply V
CC
5, the automatic converting and metering device of compound transformation ratio current transformer as claimed in claim 1, it is characterized in that: commutation circuit comprises relay J C and normally closed contact JC thereof
1With normal opened contact JC
2, wherein relay J C is serially connected in triode BG
1～2Collector and ground between, its normally closed contact JC
1, normal opened contact JC
2Correspondence is serially connected in the S of compound transformation ratio current transformer
2, S
3In the circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01216155 CN2465193Y (en) | 2001-01-21 | 2001-01-21 | Automatic convertion measurer for composit rate changing current mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01216155 CN2465193Y (en) | 2001-01-21 | 2001-01-21 | Automatic convertion measurer for composit rate changing current mutual inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2465193Y true CN2465193Y (en) | 2001-12-12 |
Family
ID=33634613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01216155 Expired - Lifetime CN2465193Y (en) | 2001-01-21 | 2001-01-21 | Automatic convertion measurer for composit rate changing current mutual inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2465193Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777046A (en) * | 2013-11-06 | 2014-05-07 | 张泽虎 | Intelligent control device for multi-transformation ratio current transformer |
| CN103941083A (en) * | 2014-04-24 | 2014-07-23 | 张泽虎 | Dual-transformation-ratio access type electric energy meter |
| CN106940391A (en) * | 2017-04-06 | 2017-07-11 | 国网山西省电力公司太原供电公司 | Threephase current transformer no-load voltage ratio on-line conversion intelligent controller |
| CN111736011A (en) * | 2020-05-19 | 2020-10-02 | 南方电网科学研究院有限责任公司 | Controllable zero sequence current transformer |
-
2001
- 2001-01-21 CN CN 01216155 patent/CN2465193Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777046A (en) * | 2013-11-06 | 2014-05-07 | 张泽虎 | Intelligent control device for multi-transformation ratio current transformer |
| CN103777046B (en) * | 2013-11-06 | 2016-08-17 | 长沙久信电力设备有限公司 | Variable specific current transformer intelligent controlling device |
| CN103941083A (en) * | 2014-04-24 | 2014-07-23 | 张泽虎 | Dual-transformation-ratio access type electric energy meter |
| CN106940391A (en) * | 2017-04-06 | 2017-07-11 | 国网山西省电力公司太原供电公司 | Threephase current transformer no-load voltage ratio on-line conversion intelligent controller |
| CN106940391B (en) * | 2017-04-06 | 2019-04-12 | 国网山西省电力公司太原供电公司 | Threephase current transformer no-load voltage ratio on-line conversion intelligent controller |
| CN111736011A (en) * | 2020-05-19 | 2020-10-02 | 南方电网科学研究院有限责任公司 | Controllable zero sequence current transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20110121 Granted publication date: 20011212 |