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Detection circuit for monitoring state of current transformer

A transformer and state technology, applied in the direction of measuring current/voltage, measuring electrical variables, voltage/current isolation, etc., can solve problems affecting the normal output signal of the current signal acquisition circuit, reduce the current measurement accuracy of the smart circuit breaker, etc., and achieve simplification Hardware circuit, improved current measurement accuracy, high safety and reliability effects

Active Publication Date: 2012-07-18
CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of the above method is that the signal used to judge the state of the current transformer is superimposed on the current signal acquisition circuit, which will affect the normal output signal of the current signal acquisition circuit, thereby reducing the current measurement accuracy of the smart circuit breaker

Method used

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  • Detection circuit for monitoring state of current transformer
  • Detection circuit for monitoring state of current transformer
  • Detection circuit for monitoring state of current transformer

Examples

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Embodiment 1

[0016] Embodiment 1: A detection circuit for monitoring the state of a current transformer, comprising a first resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, and a first amplifier; one end of the first resistor is connected to the current transformer, and the other One end is connected to the negative input end of the first amplifier; one end of the fourth resistor is connected to the negative input end of the first amplifier, and the other end is connected to the output end of the first amplifier; one end of the fifth resistor is connected to the output end of the first amplifier, and the other end is connected to the microprocessor circuit; One end of the first capacitor is connected to the negative input end of the first amplifier, and the other end is connected to the output end of the first amplifier; one end of the second capacitor is connected to the ground, and the other end is connected between the fifth resistor and the microproce...

Embodiment 2

[0019] Embodiment 2: A detection circuit for monitoring the state of a current transformer, comprising a first resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, and a first amplifier; one end of the first resistor is connected to the current transformer, and the other One end is connected to the negative input end of the first amplifier; one end of the fourth resistor is connected to the negative input end of the first amplifier, and the other end is connected to the output end of the first amplifier; one end of the fifth resistor is connected to the output end of the first amplifier, and the other end is connected to the microprocessor circuit; One end of the first capacitor is connected to the negative input end of the first amplifier, and the other end is grounded; one end of the second capacitor is connected to the ground, and the other end is connected between the fifth resistor and the microprocessor circuit; the positive input end of th...

Embodiment 3

[0022] Embodiment 3: A detection circuit for monitoring the state of a current transformer, comprising a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, and a first amplifier; One end of the resistor is connected to the current transformer, and the other end is connected to the negative input end of the first amplifier; one end of the second resistor is connected to the power supply, and the other end is connected to the positive input end of the first amplifier; one end of the third resistor is grounded, and the other end is connected to the positive input end of the first amplifier; One end of the fourth resistor is connected to the negative input end of the first amplifier, and the other end is connected to the output end of the first amplifier; one end of the fifth resistor is connected to the output end of the first amplifier, and the other end is connected to the microprocessor; one end of the...

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Abstract

The invention discloses a detection circuit for monitoring state of a current transformer, which is serially connected between the transformer and a microprocessor circuit, wherein a microprocessor is used for judging the working state of the existing current transformer according to signals from the detection circuit. The detection circuit is independent to a current signal collecting circuit and overcomes the disadvantage that a current collection signal is affected by a state signal of the current transformer, so that the current measurement precision of an intelligent circuit breaker is improved.

Description

technical field [0001] The invention relates to the field of circuit breakers, in particular to a detection circuit for monitoring the state of a current transformer. Background technique [0002] With the development of modern power electronics and computer technology, people put forward more new requirements for the reliability of smart appliances. Circuit breakers are important components in low-voltage power distribution systems, and their reliability is self-evident. As the central component of the circuit breaker, the intelligent controller is the core to realize the intelligence of the circuit breaker. The current transformer has played an irreplaceable role in current measurement and relay protection for a long time, and it usually consists of two parts: a measuring coil and an energy coil. In the low-voltage power distribution system, the entire current transformer is set on the main circuit bus of the circuit breaker, and the voltage induced by the measuring coil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R15/18
Inventor 殷建强管瑞良叶文杰周龙明
Owner CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)
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