CN203224555U - Sampling integral jaw-shape AC reactive-current meter - Google Patents
Sampling integral jaw-shape AC reactive-current meter Download PDFInfo
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- CN203224555U CN203224555U CN 201320157960 CN201320157960U CN203224555U CN 203224555 U CN203224555 U CN 203224555U CN 201320157960 CN201320157960 CN 201320157960 CN 201320157960 U CN201320157960 U CN 201320157960U CN 203224555 U CN203224555 U CN 203224555U
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Abstract
The utility model discloses a sampling integral jaw-shape AC reactive-current meter, and solves the technical problem that reactive current in an AC circuit cannot be detected by most conventional current meters. The AC reactive-current meter comprises a current transformer (2), a sampling switch (4), an integral amplifier (5), a zero-crossing comparator (12) and a 90 degree phase shifter (14). The input terminal of the sampling switch (4) is connected to a polarity output terminal of a secondary side of the current transformer (2). A power supply terminal (9) of a tested AC circuit is connected to the input terminal of the zero-crossing comparator (12) through a first divider resistor (10). The output terminal of the zero-crossing comparator (12) is connected to the input terminal of the 90 degree phase shifter (14). The output terminal of the 90 degree phase shifter (14) is connected to the control terminal of the sampling switch (4). The output terminal of the sampling switch (4) is connected to the input terminal of the integral amplifier (5). The output terminal of the integral amplifier (5) is connected to a digital display meter head (8). The sampling integral jaw-shape AC reactive-current meter has the advantages of simple structure, low cost, convenience in measurement and high precision.
Description
Technical field
The utility model relates to a kind of reometer, particularly a kind of pincerlike reactive-current meter that exchanges of sampling integration type of measuring size of current in the alternating circuit.
Background technology
In power supply system, measurement instrument is one of important tool that guarantees the power system security economical operation, it can monitor the electric equipment operation situation, make the staff can correctly count electric load, handling and judgement operation troubles and accident, also is the important source of accumulation technology data and calculating production target master data.At present, current instruments commonly used have digital display reometer, clamp on amperemeter, pointer reometer etc., generally belong to electromagnetic instrument and electrodynamometer, generally all can only measure apparent current, can not measure reactive current, have defectives such as not portable, complex structure, price height.
Summary of the invention
The utility model provides a kind of sampling integration type the pincerlike reactive-current meter that exchanges, and has solved the technical matters that most of existing reometers can't be measured reactive current in the alternating circuit.
The utility model is to solve above technical matters by the following technical programs.
The pincerlike reactive-current meter that exchanges of a kind of sampling integration type, comprise current transformer, sampling switch, integrating amplifier, zero-crossing comparator and 90 ° of phase shifters, the input end of tested alternating current is connected with the primary side input end of current transformer, the output terminal of tested alternating current is connected with the primary side output terminal of current transformer, resistance is connected in parallel between the polar end and non-polar end of secondary side of current transformer, the non-polar end ground connection of current transformer, the input end of sampling switch is connected with the polarity output terminal of the secondary side of current transformer, the power end of tested alternating circuit is connected with an end of first divider resistance, the other end of first divider resistance is connected with the input end of zero-crossing comparator, between the input end of zero-crossing comparator and ground, be connected with second divider resistance, the output terminal of zero-crossing comparator is connected with the input end of 90 ° of phase shifters, the output terminal of 90 ° of phase shifters is connected with the control end of sampling switch, the output terminal of sampling switch is connected with the input end of integrating amplifier, the output terminal of integrating amplifier is connected with the input end of digital display gauge outfit, in integrating amplifier, electric capacity is connected in parallel between amplifier input terminal and the output terminal, the negativing ending grounding of amplifier.
The utility model can make things convenient for, directly record the interchange reactive current of operational outfit, is convenient to obtaining of reactive power, is easy to the running status of judgment device and the ability of carrying electricity, increase work efficiency, and simple in structure, cost is low, and it is convenient to measure, the precision height.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Embodiment
The pincerlike reactive-current meter that exchanges of a kind of sampling integration type, comprise current transformer 2, sampling switch 4, integrating amplifier 5, zero-crossing comparator 12 and 90 ° of phase shifters 14, the input end 1 of tested alternating current is connected with the primary side input end of current transformer 2, the output terminal 13 of tested alternating current is connected with the primary side output terminal of current transformer 2, resistance 3 is connected in parallel between the polar end and non-polar end of secondary side of current transformer 2, the non-polar end ground connection of current transformer 2, the input end of sampling switch 4 is connected with the polarity output terminal of the secondary side of current transformer 2, the power end 9 of tested alternating circuit is connected with an end of first divider resistance 10, the other end of first divider resistance 10 is connected with the input end of zero-crossing comparator 12, between the input end of zero-crossing comparator 12 and ground, be connected with second divider resistance 11, the output terminal of zero-crossing comparator 12 is connected with the input end of 90 ° of phase shifters 14, the output terminal of 90 ° of phase shifters 14 is connected with the control end of sampling switch 4, the output terminal of sampling switch 4 is connected with the input end of integrating amplifier 5, the output terminal of integrating amplifier 5 is connected with the input end of digital display gauge outfit 8, in integrating amplifier 5, electric capacity 6 is connected in parallel between the input end and output terminal of amplifier 7, the negativing ending grounding of amplifier 7.
Claims (1)
1. a sampling integration type pincer exchanges reactive-current meter, comprise current transformer (2), sampling switch (4), integrating amplifier (5), zero-crossing comparator (12) and 90 ° of phase shifters (14), it is characterized in that, the input end of tested alternating current (1) is connected with the primary side input end of current transformer (2), the output terminal of tested alternating current (13) is connected with the primary side output terminal of current transformer (2), resistance (3) is connected in parallel between the polar end and non-polar end of secondary side of current transformer (2), the non-polar end ground connection of current transformer (2), the input end of sampling switch (4) is connected with the polarity output terminal of the secondary side of current transformer (2), the power end of tested alternating circuit (9) is connected with an end of first divider resistance (10), the other end of first divider resistance (10) is connected with the input end of zero-crossing comparator (12), between the input end of zero-crossing comparator (12) and ground, be connected with second divider resistance (11), the output terminal of zero-crossing comparator (12) is connected with the input end of 90 ° of phase shifters (14), the output terminal of 90 ° of phase shifters (14) is connected with the control end of sampling switch (4), the output terminal of sampling switch (4) is connected with the input end of integrating amplifier (5), the output terminal of integrating amplifier (5) is connected with the input end of digital display gauge outfit (8), in integrating amplifier (5), electric capacity (6) is connected in parallel between the input end and output terminal of amplifier (7), the negativing ending grounding of amplifier (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320157960 CN203224555U (en) | 2013-04-02 | 2013-04-02 | Sampling integral jaw-shape AC reactive-current meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320157960 CN203224555U (en) | 2013-04-02 | 2013-04-02 | Sampling integral jaw-shape AC reactive-current meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203224555U true CN203224555U (en) | 2013-10-02 |
Family
ID=49251557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320157960 Expired - Lifetime CN203224555U (en) | 2013-04-02 | 2013-04-02 | Sampling integral jaw-shape AC reactive-current meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203224555U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122434A (en) * | 2014-08-20 | 2014-10-29 | 高玉琴 | Reactive current measurement circuit |
-
2013
- 2013-04-02 CN CN 201320157960 patent/CN203224555U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122434A (en) * | 2014-08-20 | 2014-10-29 | 高玉琴 | Reactive current measurement circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131002 |