Short circuit and open circuit state detection circuit for secondary side winding of current transformer

A technology of current transformer and winding short circuit, applied in electrical winding testing, instruments, measuring electricity, etc., can solve problems such as cost, uneconomical development progress, trouble, etc., and achieve the effect of low cost, accurate detection, and accident prevention.

Inactive Publication Date: 2016-04-13
ZHEJIANG HARNPU POWER TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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This method is quite cumbersome both from the perspective of hardware and sof

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  • Short circuit and open circuit state detection circuit for secondary side winding of current transformer
  • Short circuit and open circuit state detection circuit for secondary side winding of current transformer

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[0014] Below in conjunction with the accompanying drawings, the present invention will be further described with specific embodiments, refer to Figure 1-Figure 2 ;

[0015] It should be noted that the "first", "second", "third", "fourth", "sixth", "seventh", "eighth", "third", Terms such as "ninth" do not limit the quantity of the relevant technical features, but are named for the purpose of distinguishing the relevant technical features.

[0016] This embodiment provides a short circuit open state detection circuit of a current transformer, including a signal sampling circuit 2 , a secondary side winding state judgment circuit 4 and a constant current source circuit 1 . The signal sampling circuit 2 includes a sampling resistor R5 connected in parallel with the secondary winding of the current transformer. After a plurality of diodes are connected in series, the anode is connected to the first end of the sampling resistor R5 and the cathode is grounded. The constant curren...

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Abstract

The invention discloses a short circuit and open circuit state detection circuit for a secondary side winding of a current transformer. The circuit can output voltage which accurately reflects that the secondary side winding of the current transformer is in short circuit, open circuit, or a normal state, so as to determine the short circuit, open circuit, or normal state of the secondary side winding of the current transformer. The short circuit and open circuit state detection circuit for a secondary side winding of a current transformer comprises a signal sampling circuit, a secondary side winding state judgement circuit, and a constant current source circuit used to provide constant current. The signal sampling circuit comprises sampling resistors connected in parallel with the secondary side winding of the current transformer, a plurality of diodes are connected in series, and the anode of the diodes is connected with the first end of the sampling resistor, and the cathode is connected with ground. The output end of the constant current source circuit is connected with the second end of the sampling resistor, so as to provide operating voltage for the signal sampling circuit. Voltage on two ends of the sampling resistors outputs a voltage signal through the secondary side winding state judgement circuit.

Description

technical field [0001] The invention relates to a circuit design for detecting the short-circuit and open-circuit state of the secondary side of a current transformer, in particular to a circuit design for detecting the short-circuit and open-circuit state of the secondary side of the current transformer with low cost, high accuracy and high efficiency. Background technique [0002] A current transformer (CT for short) can convert a primary current with a large value into a secondary current with a small value through a certain transformation ratio. Therefore, in many occasions where large currents are applied, CTs are required to realize functions such as protection and measurement. A large part of the CT wiring methods are connected in the form of connecting wires. In this connection mode, fault conditions such as short circuit and open circuit of the secondary winding of the CT may occur. On the one hand, these failures will lead to abnormal measurement of the measureme...

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Application Information

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IPC IPC(8): G01R31/06
CPCG01R31/72
Inventor 徐国明张益陆奇光曹达周乾
Owner ZHEJIANG HARNPU POWER TECH
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