Double circuit breaker dcb type high voltage combined electrical appliance

Abstract

Double circuit breaker DCB type high-voltage combined electrical appliance, including brackets, voltage transformers, current transformers, bushings or cable compartments, three-position isolating / grounding switches, circuit breaker mechanisms, tanks and control boxes, the structure of the circuit breaker It includes two circuit breakers symmetrically installed in the tank, and an insulating support is provided between the two arc extinguishing chambers of the two circuit breakers. The two arc extinguishing chambers are double-break type arc extinguishing chambers with taps in the middle , the first, second, third and fourth three-position isolating / grounding switches are respectively arranged on the upper and lower sides of the tap and above the two circuit breakers installed symmetrically, among which the first, second and third three-position isolation The grounding switch is connected to the bushing or cable compartment where the current transformer is installed, and the fourth and third station isolation / grounding switches are connected to the voltage transformer. Insulating gas is used as internal insulation in the arc extinguishing chamber. The double circuit breaker DCB type high-voltage combined electrical appliance can meet the needs of the digital substation, reduce the occupied area, shorten the installation time, and improve the reliability and safety of the equipment.

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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