On-off large parameter induction current outdoor high-voltage AC grounding switch

Abstract

The invention discloses a retractable large-parameter induced-current outdoor high-voltage AC earthing switch, which consists of three monopoles, wherein three phases are formed; each monopole consists of an earthing main loop and an auxiliary loop; the earthing main loop comprises a motor operating mechanism (1), a steel bracket (2), a base (4), a lower knife tube (5), a coupling (6), an upper knife tube (7) and a support insulator (8); and the auxiliary loop comprises an arc-extinguish-chamber operating mechanism (3), a moving arcing contact (9), an insulating roller wheel (10), a fixed arcing contact (11), a cable (14) and an SF6 arc extinguish chamber (16). In the invention, earthing knife tubes are designed to be the foldable upper knife tube and the lower knife tube; the auxiliary loop is used cooperatively during operation; electrical connection part is improved; the SF6 arc extinguish chamber is used cooperatively; and electrical linkage is adopted. Therefore, the switch has the characteristics of steady reliable motion, little switching-on impact, high technical parameters, excellent electrical properties, good anticorrosion performance, convenient operation, long life span and the like.

Description

technical field [0001] The invention relates to a power transmission and transformation equipment, in particular to an outdoor high-voltage AC grounding switch for opening and closing a large-parameter induction current. Background technique [0002] With the development of domestic power technology and the increase of power grid capacity, in order to reduce the land occupation of transmission corridors, the use of double-circuit transmission lines on the same tower has become the development trend of my country's 550kV backbone grid. When the double-circuit transmission line on the same tower is in one round of operation and another round of maintenance, due to the electrostatic coupling and electromagnetic coupling between the two transmission lines, induced voltage and induced current will be generated in the maintenance circuit, which is harmful to the personal safety of the operators who are undergoing maintenance. cause harm to equipment. In order to ensure the reliab...

AI Technical Summary

Problems solved by technology

The current earthing switches for opening and closing induction currents at home and abroad are all equipped with vacuum interrupters. The arc interrupters are mechanically linked with the main contacts of the earthing switch, and the dynamic and static arc contacts are directly driven in. Due to the limitations of the vacuum interrupter itself, Its ability to break the electrostatic induction current can only reach 70kV and 50A at most. However, many provinces in China, such as Shandong, have proposed the requirement of breaking the electrostatic induction current capacity to reach 100kV and 100A, and the vacuum interrupter can no longer meet the requirements.

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