Detecting and forced tripping device for alternating current intrusion into direct current system

Abstract

The present invention relates to a detection and forced jumping device for alternating current intruding into a direct current system, which is characterized in that: the positive busbar (+KM) of the direct current system is connected to an input end of an alternating current signal transmitter through a first direct current blocking capacitor (C1) , and the negative busbar (-KM) of the DC system is connected to the other input terminal of the AC signal transmitter through the second DC blocking capacitor (C2), the output terminal of the AC signal transmitter is connected to the microprocessor, and the microprocessor The two ports of the device are respectively connected to the control terminal of the first optocoupler (OP1) and the control terminal of the second optocoupler (OP2), and the output terminal of the first optocoupler (OP1) is connected to the control terminal of the first contactor (S1) The coils are connected in series, and the output end of the second optocoupler (OP2) is connected in series with the coil of the second contactor (S2). The invention realizes the on-line real-time detection of AC channeling and DC faults, and at the same time can force the AC or DC switch on the AC channeling circuit to isolate the fault branch.

Description

technical field [0001] The invention relates to a detection and forced tripping device for alternating current intruding into a direct current system. Background technique [0002] In the substation, the DC system provides DC power for control, signal, relay protection, automatic device and emergency lighting, etc. The stable and reliable operation of the DC power supply plays a very important role in the safety and stability of the power system. However, due to the wide coverage of the DC system and the complex environment, faults of AC intrusion into the DC system occur from time to time, which can cause serious accidents such as metallic grounding of the DC system, false alarms of monitoring devices, and misoperation of relay protection devices, which are extremely harmful. According to the "Eighteen Major Power Grid Anti-Accident Measures of the State Grid Corporation" [2012]: "5.1.1.18.3 Newly built or renovated substations, DC system insulation monitoring devices shoul...

AI Technical Summary

Problems solved by technology

[0003] At present, there are also some detection methods and equipment for the fault of AC intrusion into the DC system, which can test the amplitude of the AC intrusion and the specific fault circuit, but they all have a single function and can only detect and cannot be treated.