Small signal output circuit for intelligent relay protection tester

A relay protection and output circuit technology, applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc. Feedback is small and other issues, to achieve a good stability effect

Pending Publication Date: 2016-08-03
CHENGDU TESIENT INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the small amount of information feedback in traditional substations, the difficulty of summarizing and analyzing fault information, the complicated and cumbersome wiring, and the safety risks for on-site test operators,

Method used

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  • Small signal output circuit for intelligent relay protection tester
  • Small signal output circuit for intelligent relay protection tester
  • Small signal output circuit for intelligent relay protection tester

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Experimental program
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Embodiment Construction

[0017] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0018] Such as figure 1 As shown, a small signal output circuit of an intelligent relay protection tester includes a D / A conversion circuit, a second-order filter circuit, a voltage follower circuit and an anti-surge circuit; the D / A conversion circuit and the second-order filter circuit connection, the output end of the second-order filter circuit is connected to the voltage follower circuit, and the output end of the voltage follower circuit is connected to the anti-surge circuit;

[0019] Described D / A conversion circuit comprises optocoupler G, and the first input end of optocoupler G is connected to the PWM digital signal output end P of external controller; The second input end of optocoupler isolator G is grounded; The output termin...

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PUM

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Abstract

The invention discloses a small signal output circuit for an intelligent relay protection tester, which comprises a D/A conversion circuit, a second-order filter circuit, a voltage following circuit and an anti-surge circuit, wherein the D/A conversion circuit is connected with the second-order filter circuit; the output end of the second-order filter circuit is connected with the voltage following circuit; and the output end of the voltage following circuit is connected with the anti-surge circuit. According to the small signal output circuit for the intelligent relay protection tester provided by the invention, a PWM digital signal outputted by an external controller is converted into an analog signal via the D/A conversion circuit, signal output is then carried out via the second-order filter circuit, the voltage following circuit and the anti-surge circuit, and the circuit stability is good.

Description

technical field [0001] The invention relates to a small signal output circuit of an intelligent relay protection tester. Background technique [0002] Due to the small amount of information feedback in traditional substations, the difficulty of summarizing and analyzing fault information, the complicated and cumbersome wiring, and the safety risks for on-site test operators, as well as the rapid development of information, communication and network technologies in recent years, people have begun to try to develop corresponding The products match it, so the generation of intelligent relay protection tester. [0003] During the working process of the intelligent relay protection tester, the test data needs to be transmitted to the tested relay in the form of an analog signal through the small signal output port, and further collect the response of the tested relay to provide a basis for subsequent analysis. Therefore, the small signal output circuit of the intelligent relay p...

Claims

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Application Information

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IPC IPC(8): H03M1/66H02H9/06
CPCH02H9/06H03M1/66
Inventor 王周蓉
Owner CHENGDU TESIENT INSTR
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