I/O device for direct-current control protection system

Abstract

The invention relates to an I / O device for a direct-current control protection system. The I / O device comprises an isolation component; a device signal input end, an input current limiting module and a signal electric level monitoring module are connected in series in the primary side loop of the isolation component; the input current limiting module is used for controlling the current of external input signals to making the current be in a certain range; the signal input end of the signal electric level monitoring module is correspondingly connected with the device signal input end; the signal electric level monitoring module is used for outputting corresponding signals when the voltage amplitude of the external input signals reaches a set value; and the secondary side output of the isolation component is connected with an output port module. The device can effectively filter out weak signals and effectively resist interference on the device caused by the weak signals, and therefore, with the device adopted, wrong judgment and analysis on field people can be avoided. The device has high anti-interference performance.

Description

technical field [0001] The invention relates to an I / O device for a direct current control and protection system. Background technique [0002] In the DC transmission control and protection system, a large number of real-time equipment status signals and functional logic signals need to be transmitted between the primary equipment of the DC field and the AC field and the control and protection host, and between the control and protection host. For example, the consumption of an UHV DC project reaches nearly ten thousand. Due to the harsh electromagnetic interference environment at the site, in order to prevent the generation of wrong logic caused by misplacement, which will lead to protection malfunction and cause accidents, the operator of the converter station requires that the signal transmission between the screens prohibit the use of low-voltage level signals such as DC24V, but DC220V or DC110V high voltage level should be used. However, as the core of the DC control ...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide an I / O device for a DC control and protection system, which is used to solve the problem that the existing I / O module action value exceeds the standard, especially the low turn-off action voltage, resulting in poor anti-interference performance

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