CN209342788U - Automatic conversion metering device for composite transform-ratio current mutual inductor - Google Patents
Automatic conversion metering device for composite transform-ratio current mutual inductor Download PDFInfo
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- CN209342788U CN209342788U CN201822216435.6U CN201822216435U CN209342788U CN 209342788 U CN209342788 U CN 209342788U CN 201822216435 U CN201822216435 U CN 201822216435U CN 209342788 U CN209342788 U CN 209342788U
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Abstract
The utility model relates to electric-power metering technical fields, more particularly to a kind of automatic conversion metering device for composite transform-ratio current mutual inductor, including composite transformation ratio current transformer, sample circuit, comparison circuit, driving circuit and switching circuit, the composite transformation ratio mutual inductor includes CT1, CT2, the small no-load voltage ratio output terminal CTS1 of composite transformation ratio mutual inductor CT1 secondary side, the secondary side output terminal S1 of CTS2 and composite transformation ratio mutual inductor CT2, S2 same polarity is in parallel, the secondary side output terminal S1 of composite transformation ratio mutual inductor CT2, S2 connects kilowatt-hour meter, the secondary side large velocity ratio output terminal CTS1 of composite transformation ratio mutual inductor CT1, the primary side large velocity ratio output terminal P1 of CTS3 and composite transformation ratio mutual inductor CT2, P3 same polarity is connected, it is concatenated between terminal CTS3 and terminals P 3 The control switch of switching circuit.The utility model substantially increases the service life of product, effectively raises the accuracy of metering.
Description
Technical field
The utility model relates to electric-power metering technical fields, and in particular to a kind of composite transformation ratio current transformer automatic conversion
Metering device.
Background technique
In current electric-power metering field, often the current transformer of secondary composite transformation ratio is mounted in power circuit, is used
Metering when power load is unstable is measured in underload with small no-load voltage ratio, when high load capacity is measured with large velocity ratio, is mentioned with this
High measuring accuracy.But in operation, there are the height of power load to change at any time, manually monitors and switch no-load voltage ratio at any time
Possibility almost without, existing automatic conversion metering device for composite transform-ratio current mutual inductor can real-time monitoring load variations, from
Dynamic switching no-load voltage ratio.But automatic conversion metering device for composite transform-ratio current mutual inductor meeting moment belt current cutting in conversion is secondary
Circuit, at this moment relay contact moment can generate electric arc and can generate high pressure.
The Chinese patent of patent No. ZL01216155.1 discloses a kind of composite transformation ratio current transformer automatic conversion metering
Device, composite transformation ratio current transformer, sample circuit, comparison circuit, driving circuit and the switching circuit, sample circuit are connected to multiple
In the secondary terminals route for closing transformation ratio current transformer, sample circuit output end connects driving circuit, switching circuit through comparison circuit
It is connect respectively with driving circuit and composite transformation ratio mutual inductor, composite transformation ratio mutual inductor output termination kilowatt-hour meter realizes composite transformation ratio
The automatic conversion of current transformer size no-load voltage ratio, but in conversion, meeting moment belt current cuts off secondary circuit, and at this moment relay touches
Point moment can generate electric arc and can generate high pressure.To solve this problem, the Chinese patent of Patent No. ZL200820027236.4
A kind of automatic conversion metering device for composite transform-ratio current mutual inductor with protection circuit is disclosed, which is by capacitance-resistance
Element composition, which is connected across between automatic conversion metering device for composite transform-ratio current mutual inductor switching relay contact, absorbs relay
Device contact electric arc and the high pressure for eliminating the open circuit generation of composite transformation ratio secondary winding in current transformer.The protection circuit actually makes
With the hidden danger that can have breakdown due to the cause for quality of arc extinguishing capacitor in the process, once capacitor punctures the accuracy meeting entirely measured
It is greatly reduced, 50% leakage can be caused to measure when serious.
Utility model content
In order to solve the above technical problems, the purpose of this utility model is that: provide a kind of composite transformation ratio current transformer from
Dynamic converting and metering device, substantially increases the service life of product, effectively raises the accuracy of metering.
The technical scheme adopted by the utility model for solving the technical problem is:
The automatic conversion metering device for composite transform-ratio current mutual inductor, including composite transformation ratio current transformer, sampling electricity
Road, comparison circuit, driving circuit and switching circuit, sample circuit are connected to the secondary terminals route of composite transformation ratio current transformer
In, sample circuit output end connects driving circuit through comparison circuit, switching circuit respectively with driving circuit and composite transformation ratio mutual inductor
Connection, composite transformation ratio mutual inductor output termination kilowatt-hour meter, the composite transformation ratio mutual inductor includes CT1, CT2, composite transformation ratio mutual inductance
Secondary side output terminal S1, S2 of device CT1 secondary side small no-load voltage ratio output terminal CTS1, CTS2 and composite transformation ratio mutual inductor CT2 are same
Polarity is in parallel, and secondary side output terminal S1, S2 of composite transformation ratio mutual inductor CT2 connects kilowatt-hour meter, and the two of composite transformation ratio mutual inductor CT1
Primary side large velocity ratio output terminal P1, P3 homopolarity of secondary side large velocity ratio output terminal CTS1, CTS3 and composite transformation ratio mutual inductor CT2
Property be connected, between terminal CTS3 and terminals P 3 concatenate switching circuit control switch.
Sample circuit induced electricity load signal is simultaneously output to comparison circuit, and comparison circuit compares line electricity load signal
Compared with, and comparison result output is sent to driving circuit, if it is Smaller load, the control switch of switching circuit is failure to actuate, terminal
CTS3 is disconnected with terminals P 3, at this time into table be terminal CTS1 and terminal CTS2 electric current；If it is big load, driving electricity
Road drives the control switch movement of switching circuit, connects terminal CTS3 and terminals P 3, at this time into table be terminal CTS1, CTS2,
CTS3 combines input current.Composite transformation ratio mutual inductor CT1 has a circuit to be constantly in connected state in this case, with
Electric arc would not be generated in conversion equipment internal relay moving process, while mutual inductor is not opened a way will not generate high pressure.
Wherein, preferred embodiment are as follows:
The switching circuit includes relay JC, relay JC coil tandem between driving circuit output end and ground, after
Electric appliance JC normally opened contact is serially connected between terminal CTS3 and terminals P 3.
The sample circuit uses Current Transmit 3, one output end ground connection, and another output terminates comparison circuit.
Compared with prior art, the utility model has the following beneficial effects:
Composite transformation ratio current transformer does not have the case where instantaneous open circuit in the utility model, while eliminating arc extinguishing capacitor,
It solves the problems, such as composite transformation ratio current transformer polytropic ratio automatic conversion, while solving to generate electricity in relay moving process again
Arc burns problem to relay contact, while current transformer does not have instantaneous open circuit not generate high pressure to cause to puncture to product,
Novel conversion regime, which solves, measures misalignment problem caused by the above problem, substantially increase the service life of product, effectively
The accuracy for improving metering.
Detailed description of the invention
Fig. 1 is the utility model principle block diagram.
Fig. 2 is the utility model electrical schematic diagram.
Specific embodiment
The utility model embodiment is described further with reference to the accompanying drawing:
Embodiment 1:
As shown in Figure 1, automatic conversion metering device for composite transform-ratio current mutual inductor described in the utility model, including compound change
Than current transformer, sample circuit, comparison circuit, driving circuit and switching circuit, it is mutual that sample circuit is connected to composite transformation ratio electric current
In the secondary terminals route of sensor, sample circuit output end connects driving circuit through comparison circuit, and switching circuit is electric with driving respectively
Road is connected with composite transformation ratio mutual inductor, composite transformation ratio mutual inductor output termination kilowatt-hour meter KWH, and the composite transformation ratio mutual inductor includes
CT1, CT2, the two of composite transformation ratio mutual inductor CT1 secondary side small no-load voltage ratio output terminal CTS1, CTS2 and composite transformation ratio mutual inductor CT2
Secondary side output terminal S1, S2 same polarity is in parallel, and secondary side output terminal S1, S2 of composite transformation ratio mutual inductor CT2 connects kilowatt-hour meter, multiple
Close the big change of primary side of secondary side large velocity ratio output terminal CTS1, CTS3 and composite transformation ratio mutual inductor CT2 of no-load voltage ratio mutual inductor CT1
It is connected than output terminal P1, P3 same polarity, the control switch of switching circuit is concatenated between terminal CTS3 and terminals P 3.
Wherein, switching circuit includes relay JC, relay JC coil tandem between driving circuit output end and ground, after
Electric appliance JC normally opened contact is serially connected between terminal CTS3 and terminals P 3；Sample circuit uses Current Transmit 3, one output end
Ground connection, another output terminate comparison circuit.The patent that above-mentioned sample circuit, comparison circuit and driving circuit and the applicant hold
Structure described in ZL01216155.1 or patent ZL200820027236.4 disclosure is consistent, does not repeat herein.
Sample circuit induced electricity load signal is simultaneously output to comparison circuit, and comparison circuit compares line electricity load signal
Compared with, and comparison result output is sent to driving circuit, if it is Smaller load, the control switch of switching circuit is failure to actuate, terminal
CTS3 is disconnected with terminals P 3, at this time into table be terminal CTS1 and terminal CTS2 electric current；If it is big load, driving electricity
Road drives the control switch movement of switching circuit, connects terminal CTS3 and terminals P 3, at this time into table be terminal CTS1, CTS2,
CTS3 combines input current.Composite transformation ratio mutual inductor CT1 has a circuit to be constantly in connected state in this case, with
Electric arc would not be generated in conversion equipment internal relay moving process, while mutual inductor is not opened a way will not generate high pressure.
Claims (3)
1. a kind of automatic conversion metering device for composite transform-ratio current mutual inductor, including composite transformation ratio current transformer, sample circuit,
Comparison circuit, driving circuit and switching circuit, sample circuit are connected in the secondary terminals route of composite transformation ratio current transformer, adopt
Sample circuit output end connects driving circuit through comparison circuit, and switching circuit is connect with driving circuit and composite transformation ratio mutual inductor respectively,
Composite transformation ratio mutual inductor output termination kilowatt-hour meter, which is characterized in that the composite transformation ratio mutual inductor includes CT1, CT2, compound change
No-load voltage ratio output terminal CTS1, CTS2 small and composite transformation ratio mutual inductor CT2 the secondary side output terminal than mutual inductor CT1 secondary side
S1, S2 same polarity are in parallel, and secondary side output terminal S1, S2 of composite transformation ratio mutual inductor CT2 connects kilowatt-hour meter, composite transformation ratio mutual inductor
The primary side large velocity ratio output terminal of secondary side large velocity ratio output terminal CTS1, CTS3 and composite transformation ratio mutual inductor CT2 of CT1
P1, P3 same polarity are connected, and the control switch of switching circuit is concatenated between terminal CTS3 and terminals P 3.
2. automatic conversion metering device for composite transform-ratio current mutual inductor according to claim 1, which is characterized in that described to cut
Changing circuit includes relay JC, and relay JC coil tandem is between driving circuit output end and ground, relay JC normally opened contact
It is serially connected between terminal CTS3 and terminals P 3.
3. automatic conversion metering device for composite transform-ratio current mutual inductor according to claim 1, which is characterized in that described to adopt
Sample circuit uses Current Transmit 3, one output end ground connection, and another output terminates comparison circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822216435.6U CN209342788U (en) | 2018-12-27 | 2018-12-27 | Automatic conversion metering device for composite transform-ratio current mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822216435.6U CN209342788U (en) | 2018-12-27 | 2018-12-27 | Automatic conversion metering device for composite transform-ratio current mutual inductor |
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| Publication Number | Publication Date |
|---|---|
| CN209342788U true CN209342788U (en) | 2019-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822216435.6U Active CN209342788U (en) | 2018-12-27 | 2018-12-27 | Automatic conversion metering device for composite transform-ratio current mutual inductor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113658788A (en) * | 2020-11-12 | 2021-11-16 | 四川泰克电器有限公司 | But automatically regulated's multiple transformation ratio current transformer |
-
2018
- 2018-12-27 CN CN201822216435.6U patent/CN209342788U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113658788A (en) * | 2020-11-12 | 2021-11-16 | 四川泰克电器有限公司 | But automatically regulated's multiple transformation ratio current transformer |
| CN113658788B (en) * | 2020-11-12 | 2024-04-30 | 四川泰克电器有限公司 | Automatic adjustable multi-transformation ratio current transformer |
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