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1. (WO2018145603) HIGH-VOLTAGE LARGE-CURRENT ZERO-EQUIVALENT PHASE SWITCH, AND CONTROL METHOD THEREOF

Pub. No.:    WO/2018/145603    International Application No.:    PCT/CN2018/075076
Publication Date: Fri Aug 17 01:59:59 CEST 2018 International Filing Date: Sat Feb 03 00:59:59 CET 2018
IPC: H01H 9/54
H01H 9/56
Applicants: WANG, Hai
王海
Inventors: WANG, Hai
王海
Title: HIGH-VOLTAGE LARGE-CURRENT ZERO-EQUIVALENT PHASE SWITCH, AND CONTROL METHOD THEREOF
Abstract:
The invention provides a high-voltage large-current zero-equivalent phase switch, and a control method thereof. The switch is characterized in that two or more switch unit modules are connected in series; and each switch unit module comprises a main switch loop, an auxiliary switch loop, a power supply, a voltage equalization circuit unit, and a current transformer connected in the main switch loop, wherein the auxiliary switch loop and the power supply and voltage equalization circuit unit are connected in parallel with the two ends of a main switch, an output of the current transformer is connected to the power supply and voltage equalization circuit unit, the power supply and voltage equalization circuit unit supplies power for a switch control and communication circuit unit, and the switch control and communication circuit unit controls the main switch and an auxiliary relay to be turned on or off. The high-voltage large-current zero-equivalent phase switch provided by the invention has the advantages that air contact switches are used as high-voltage switches which can only be vacuum switches or SF6 switches in the prior art; vacuum or SF6 protection for contacts are no more needed, so that the switch manufacturing and maintenance costs are lower; and no inrush currents are generated by switch actions, so that arcs and pollution to a power grid are prevented.