Phase-wire grounding warner

Abstract

The invention relates to a warning device for grounding phase wires of a trolley switch and a high-voltage switch cabinet, in particular to a phase-wire grounding warner which is characterized by comprising a potential transformer (PT), wherein a primary winding of the PT is connected in series between a null wire and the ground; a coil of another relay (YJ) is connected in series between two ends of a secondary winding of the PT; one end of the secondary winding of the PT is grounded; and a pair of normally open contacts of the relay (YJ) is connected in series with a voice warner (IC1) and then connected in parallel at two ends of a direct-current power supply. The device provided by the invention has the advantages of simple structure, stability and reliability in operation, and convenience for installation, and can further achieve an effect of self examination and be also discovered easily if damaged.

Description

technical field [0001] The invention relates to an alarm device for the grounding of the phase line of a trolley switch and a high-voltage switch cabinet, especially a phase line grounding alarm. Background technique [0002] With the rapid development of electric power technology, trolley switches and high-voltage switchgears have been widely used in power supply and consumption systems. The trolley switch and switchgear have obvious advantages over the oil switch due to its compact structure, small footprint, and allowable mechanical and electrical life. Therefore, it has been widely used in domestic 10kV and 35kV systems in recent years. [0003] However, according to the existing operating experience, domestic trolley switches and switchgears are relatively deficient in terms of design level and manufacturing process, especially in the reliability of the operating mechanism, insulation and other aspects urgently need to be further improved. There are certain hidden dan...

AI Technical Summary

Problems solved by technology

Although all substations are now equipped with small current grounding line selection devices, due to the defects of the line selection principle, the small current grounding line selection system cannot accurately determine which line is grounded, and the small current grounding device is installed in the protection In the control room or control room, after the system is grounded, it cannot give an early warning to the staff in the high-voltage room. Once the grounding causes the switchgear in the high-voltage room to explode, it will pose a great threat to the personal safety of the indoor personnel.

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