Active and passive input self-adaptive circuit for relay protection testing device

A technology of self-adaptive circuit and relay protection, applied in the direction of regulating electrical variables, instruments, control/regulating systems, etc.

Active Publication Date: 2015-02-04
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011]The problem to be solved by the present invention is that, in view of the various forms of input quantity of the current relay protection tester, the present invention proposes an active, Passive binary input adaptive circuit

Method used

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  • Active and passive input self-adaptive circuit for relay protection testing device
  • Active and passive input self-adaptive circuit for relay protection testing device
  • Active and passive input self-adaptive circuit for relay protection testing device

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] figure 1 It is the schematic diagram of active and passive binary input adaptive circuit and the current flow diagram in normal state. D1~D10 are high-speed diodes of the same type, among which, D1~D8 constitute an asymmetric bridge rectifier circuit; LEDn and T are light-emitting diodes and photosensitive transistors packaged in one chip, R is a current limiting resistor, and DC-DC is a DC isolation power supply. The DC-DC DC isolated power supply converts the 5V power supply on the weak side to the 24V power supply on the strong side, and at the same time, realizes the isolation between the weak side and the strong side. The isolation principle of DC-DC DC isolation power supply adopts high-frequency transformer, and the control principle adopts open-loop control. In the normal state, the input of the circuit is in a high-impedance state, and the current f...

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Abstract

The invention relates to an active and passive input self-adaptive circuit for a relay protection testing device. The active and passive input self-adaptive circuit is characterized by consisting of a DC-DC (Direct Current-Direct Current) isolating power supply, an asymmetric bridge rectifier circuit and a photoelectric coupler circuit, wherein the DC-DC isolating power supply supplies a power supply to an input circuit; the photoelectric coupler circuit is used for transmitting the real-time state of the input at the strong current side to the weak current side, and a master control circuit at the weak current side monitors the real-time state; the asymmetric bridge rectifier circuit is used for converting a voltage with active input into a voltage with fixed polarity, so as to realize polarity self-adaption of the active input; an upper bridge of one bridge arm of the asymmetric bridge rectifier circuit and a lower bridge of another bridge arm are connected in series through three high-speed diodes, and each of another two bridges only comprises one high-speed diode. The active and passive input self-adaptive circuit disclosed by the invention is self-adaptive for various types of input forms and the polarity with active input. The invention is applicable to the active and passive input self-adaptive circuit for the relay protection testing device.

Description

[0001] technical field [0002] The invention relates to an active and passive binary input self-adaptive circuit for a relay protection tester, which belongs to the technical field of electric power system relay protection. Background technique [0003] The relay protection device is one of the most important secondary equipment in the power system, and it is the guarantee for the safe operation of the power system. Most of the large-scale system accidents involving a wide range of power outages are directly or indirectly related to the incorrect action of the relay protection device. . Therefore, it is an important condition to ensure the safe operation of the power grid to arrange the relay protection setting reasonably and improve the operation management level of the relay protection. [0004] With the rapid development of the national power system, relay protection devices are required to be more perfect and reliable. Relay protection technology is becoming more ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/46
Inventor 周勤熊华强马建张春强胡海梅裴茂林陈克旭谢三军熊志凌
Owner STATE GRID CORP OF CHINA
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