Converter station valve hall fire signal extension device

Abstract

The invention relates to a converter station valve hall fire signal extension device which comprises three relays. Each relay comprises two normally-open contacts, two normally-closed contacts and an abnormal alarm contact; the first normally-open contact of the first relay and the first normally-open contact of the second relay are parallelly connected prior to being connected to a first direct-current control and protection system, the second normally-open contact of the first relay and the second normally-open contact of the second relay are parallelly connected prior to being connected to a second direct-current control and protection system, and the two normally-open contacts of the third relay are parallelly connected prior to being connected to a fire control system; the first normally-closed contact of the first relay is connected to the first direct-current control and protect system, the first normally-closed contact of the second relay is connected to the second direct-current control and protection system, and the first normally-closed contact of the third relay is connected to the fire control system. By the arrangement, false alarm signals and false operations caused by fault of the single relay are prevented, and failure in actuate caused by the fault of the single relay in case of fire is prevented as well.

Description

technical field [0001] The invention relates to a fire signal expansion device for a valve hall of a converter station, belonging to the technical field of microcomputer protection. Background technique [0002] The price of the converter valve is very expensive. For the whole converter station, its investment accounts for about half of the total station investment. It is the key equipment of the converter station of the HVDC power transmission project. Therefore, the protection of the converter valve becomes the core of concern. As large as the converter valve, as small as the thyristor element, there are generally very complete and mature electrical protection devices. However, the fire accidents in the valve hall of the converter station in recent years have brought forward a new topic of fire protection for the valve hall of the converter station to the majority of electric power workers. Generally speaking, the length of system downtime caused by fire is related to th...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a valve hall fire signal expansion device of a converter station, which is used to solve the problem that the existing fire alarm device is prone to cause malfunction of the device or cause the device to fail to operate when a fire occurs in the event of an abnormality. question

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