CN203224553U - Sampling integral jaw-shaped AC active current meter - Google Patents

Sampling integral jaw-shaped AC active current meter Download PDF

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Publication number
CN203224553U
CN203224553U CN 201320157949 CN201320157949U CN203224553U CN 203224553 U CN203224553 U CN 203224553U CN 201320157949 CN201320157949 CN 201320157949 CN 201320157949 U CN201320157949 U CN 201320157949U CN 203224553 U CN203224553 U CN 203224553U
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China
Prior art keywords
output terminal
input
current
zero
current transformer
Prior art date
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Active
Application number
CN 201320157949
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Chinese (zh)
Inventor
曲莹
薄毅民
郑惠萍
张悦
宋述勇
王玮茹
薛敏
郝鑫杰
刘新元
杨尉薇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd
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Application filed by State Grid Corp of China SGCC, Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN 201320157949 priority Critical patent/CN203224553U/en
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Publication of CN203224553U publication Critical patent/CN203224553U/en
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Abstract

The utility model discloses a sampling integral jaw-shaped AC active current meter, and solves the problem that active current in an AC circuit cannot be detected by most conventional current meters. The AC active current meter comprises a current transformer (2), a sampling switch (4), an integral amplifier (5), and a zero-crossing comparator (12). 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 one terminal of a first divider resistor (10). The other terminal of the first divider resistor (10) is connected to the input terminal of the zero-crossing comparator (12). The output terminal of the zero-crossing comparator (12) 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 the input terminal of a digital display meter head (8). The sampling integral jaw-shape AC active-current meter has the advantages of simple structure, low cost, convenience in measurement and high precision.

Description

The pincerlike active current table that exchanges of sampling integration type
Technical field
The utility model relates to a kind of reometer, particularly a kind of pincerlike active current table 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 active current, have not portable, complex structure, defectives such as price height.
Summary of the invention
The utility model provides a kind of sampling integration type the pincerlike active current table that exchanges, and has solved the technical matters that most of existing reometers can't be measured active current in the alternating circuit.
The utility model is to solve above technical matters by the following technical programs.
The pincerlike active current table that exchanges of a kind of sampling integration type, comprise current transformer, sampling switch, integrating amplifier and zero-crossing comparator, 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 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 active current of operational outfit, is convenient to obtaining of active 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 active current table that exchanges of a kind of sampling integration type, comprise current transformer 2, sampling switch 4, integrating amplifier 5 and zero-crossing comparator 12, 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 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 the active current table, comprise current transformer (2), sampling switch (4), integrating amplifier (5) and zero-crossing comparator (12), 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 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).
CN 201320157949 2013-04-02 2013-04-02 Sampling integral jaw-shaped AC active current meter Active CN203224553U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201320157949 CN203224553U (en) 2013-04-02 2013-04-02 Sampling integral jaw-shaped AC active current meter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201320157949 CN203224553U (en) 2013-04-02 2013-04-02 Sampling integral jaw-shaped AC active current meter

Publications (1)

Publication Number Publication Date
CN203224553U true CN203224553U (en) 2013-10-02

Family

ID=49251555

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 201320157949 Active CN203224553U (en) 2013-04-02 2013-04-02 Sampling integral jaw-shaped AC active current meter

Country Status (1)

Country Link
CN (1) CN203224553U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105652077A (en) * 2015-12-30 2016-06-08 天津诚电科技有限公司 Current testing instrument
CN106053916A (en) * 2015-03-18 2016-10-26 大众汽车有限公司 Vechile-mounted power supply and method for measuring current in conductor of vechile-mounted power supply

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106053916A (en) * 2015-03-18 2016-10-26 大众汽车有限公司 Vechile-mounted power supply and method for measuring current in conductor of vechile-mounted power supply
CN105652077A (en) * 2015-12-30 2016-06-08 天津诚电科技有限公司 Current testing instrument

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