Novel SVG or SVC power supply system of 35kV-220kV type transformer substation

Abstract

The invention discloses a novel SVG or SVC power supply system of a 35kV-220kV type transformer substation. The novel SVG or SVC power supply system comprises a main transformer low-voltage coil, a cable, a copper-based bus, a 10-kV isolation disconnecting link, and a 10-kV-level or 6-kV-level SVG or SVC. A step-down transformer for providing power for the 10-kV-level or 6-kV-level SVG or SVC separately and a 35-kV switch cabinet connected with the step-down transformer in the transformer substation are removed; one group of low-voltage coils is added at a main transformer low-voltage side; and the 35kV to 220kV of high voltage is reduced to be the 10kV to 6kV of voltage to provide power for the SVG or SVC directly. According to the invention, the step-down transformer for providing powerfor the 10-kV-level or 6-kV-level SVG or SVC separately and the 35-kV switch cabinet connected with the step-down transformer in the transformer substation are removed, one group of low-voltage coilsis added at the main transformer low-voltage side, and the 35kV to 220kV of high voltage is reduced to be the 10kV to 6kV of voltage to provide power for the SVG or SVC directly, so that problems of high purchasing costs caused by equipment increasing and large field equipment foundation construction and equipment installation workloads can be solved; and because of reduction of the middle link, the difficulty of operation and maintenance is reduced.

Description

technical field [0001] The invention relates to a novel 35kV-220kV substation SVG or SVC power supply system. Background technique [0002] In the current prior art, there are two design schemes for the SVG or SVC power supply system in the 35kV-220kV substation: one is the 35kV direct-mounted power supply, which is suitable for the relatively large capacity of the SVG or SVC; The other is to change the voltage from 35kV to 10kV or 6kV through a step-down transformer, and then supply power to SVG or SVC. This method is suitable for situations where the capacity of SVG or SVC is relatively small, but the existing 35kV-220kV substation has 10kV Or a 6kV or 6kV SVG or SVC power supply system needs to provide a separate step-down transformer for power supply, which brings the following disadvantages: 1. High procurement cost due to increased equipment; The amount of equipment installation is large; 3 the difficulty of operation and maintenance in the later period increases, whi...

AI Technical Summary

Problems solved by technology

[0002] At present, in the existing technology, there are two design schemes for SVG or SVC power supply system in 35kV-220kV substation: one is 35kV direct-mounted power supply, which is suitable for relatively large SVG or SVC capacity; The other is to change the voltage from 35kV to 10kV or 6kV through a step-down transformer, and then supply power to SVG or SVC. This method is suitable for situations where the capacity of SVG or SVC is relatively small, but 10kV in existing 35kV-220kV substations Or 6kV voltage level SVG or SVC power supply system needs to provide a separate step-down transformer for its power supply, which brings the following disadvantages: 1. High procurement cost due to the increase of equipment; The amount of equipment installation is large; 3. The difficulty of operation and maintenance in the later stage will increase, which will cause certain safety hazards to the safe production of the power station; and a series of problems

Images