Interrupting chamber, HVDC bypass interruptor and HVDC-conversion substation with such a chamber

Abstract

The invention relates to an interrupting chamber, an HVDC bypass interrupor and an HVDC-conversion substation with such a chamber. The interior of a hollow tube (30) completely passing through one bearing contact piece (3) is blown out. According to the invention, a neck (304) with a cross section S2 is formed in a blowing-out gas path at the upstream of a real contact part (31) coupled with the hollow tube (30) with a cross section S1. A relative wide circulation cross section S3 (305) is formed between them (304,31). Namely S2<S1<S3. In the way, a low gas density area is prevented from forming adjacent to the real contact part (31) and after the current chopping operation, the low gas density area mostly exposes in the area of the electric field. The interrupting chamber has good dielectric strength at the transient recovery voltage (TRV).

Description

technical field [0001] The invention relates to an interruption chamber. [0002] More specifically, it concerns the interruption of high voltage direct current (HVDC). [0003] It involves interrupting the blowing of gas in the chamber. [0004] More specifically, it applies to the construction of HVDC bypass interrupters, as well as their integration into HVDC converter substations. Background technique [0005] The purpose of an HVDC converter substation is to convert direct current at high voltage (typically greater than 200 kilovolts (kV) DC) to alternating current also at high voltage. [0006] One architecture of an HVDC transmission system utilizing multiple HVDC substations is described eg in patent document WO 2007 / 084041. The system described therein comprises two substations 2 and 3 connected to each other by a high voltage power line 10 and a ground return line 11 . Each substation 2 or 3 comprises a plurality of HVDC bypass interrupters 12 , 13 or 14 , 15 ....

AI Technical Summary

Problems solved by technology

[0026] The disadvantage of said patent is that the position of the insulator 10 relative to the hollow tube 8 is such that the minimum flow cross-section of the blown gas is at the end of the tulip 9

There is thus a major risk that the gas is at a low density and therefore the dielectric strength is lower at the transient recovery voltage in the region at the end of the arcing contact, which is the region where the steepest dielectric gradient occurs

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