Double-breaker DCB type high-voltage composite apparatus

Abstract

A double-breaker DCB type high-voltage composite apparatus comprises a support, a voltage transformer, a current transformer, a casing pipe or a cable tank, three-station isolation / grounding switches, a breaker mechanism, a tank body and a collection control tank, a breaker structure comprises two breakers symmetrically arranged in the tank body, an insulation supporting piece is arranged between two arc extinguish chambers of the two breakers, the two arc extinguish chambers are double-fracture arc extinguish chambers with taps in the middles, the first three-station isolation / grounding switch, the second three-station isolation / grounding switch, the third three-station isolation / grounding switch and the fourth three-station isolation / grounding switch are arranged on the upper sides and the lower sides of the taps and above the two symmetrically-arranged breakers respectively, the first three-station isolation / grounding switch, the second three-station isolation / grounding switch and the third three-station isolation / grounding switch are connected with the casing pipe or the cable tank with the current transformer, and the fourth three-station isolation / grounding switch is connected with the voltage transformer. Insulation gas is adopted in the arc extinguish chambers to be used as inner insulation, the double-breaker DCB type high-voltage composite apparatus can meet the requirement of a digital substation, the occupied area is reduced, mounting time is shortened, and the reliability and safety of the apparatus are improved.

Description

technical field [0001] The invention relates to the technical field of high-voltage electrical appliances, specifically, it is a double circuit breaker (DCB) type outdoor gas-insulated metal-enclosed combined electrical appliance. Background technique [0002] At present, there are three problems in the operation and manufacture of high-voltage combined switchgear and even UHV combined switchgear. [0003] First of all, it is about the small current capacity (capacitive current, inductive current) of the isolation switch on the side of the interval line, how to meet the actual requirements. With the rapid development of the power system, more and more lines are paralleled on the same pole, and the operation of the power grid has higher and higher requirements for the isolation switch and the grounding switch to meet the induced current. IEC, the country, and the industry have formulated corresponding standards. . The problem now is that the relevant tests conducted accordi...

AI Technical Summary

Problems solved by technology

For those lines that are relatively short, there is no need to connect a reactor to limit the power frequency overvoltage, or there is a reactor connected to the bus, but it is not designed for a certain line, the former method cannot be used but the latter method can only be used

HSGS is actually a fast switch activated by relay protection, but none of the existing grounding isolation switches can meet the above functions

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