JPH0432202U

JPH0432202U -

Info

Publication number: JPH0432202U
Application number: JP7336890U
Authority: JP
Priority date: 1990-07-12
Filing date: 1990-07-12
Publication date: 1992-03-16

Description

[Brief explanation of the drawing]

第１図はこの考案にかかる蒸気タービンの過速
防止装置の一例を示す概略系統図、第２図は従来
の実施例を示す概略系統図である。３……蒸気加減弁、４……タービン高圧部、５
……再熱器、７……中間阻止弁、８……タービン
中圧部、９……タービン低圧部、１０……復水器
、１１……発電機、２１……第１脇路弁、２２…
…第２脇路弁、２５……切替器、２６……アンバ
ランスロードセンシング回路、２８……第１脇路
管、２９……ブレーキモータ、３０……第２脇路
管、Ｒ……タービン軸。 FIG. 1 is a schematic system diagram showing an example of an overspeed prevention device for a steam turbine according to this invention, and FIG. 2 is a schematic system diagram showing a conventional embodiment. 3... Steam control valve, 4... Turbine high pressure section, 5
... Reheater, 7 ... Intermediate blocking valve, 8 ... Turbine intermediate pressure section, 9 ... Turbine low pressure section, 10 ... Condenser, 11 ... Generator, 21 ... First side valve, 22...
...Second sideway valve, 25...Switcher, 26...Unbalanced load sensing circuit, 28...First sideway pipe, 29...Brake motor, 30...Second sideway pipe, R...Turbine shaft.

Claims

[Scope of utility model registration request]

The turbine high-pressure section, turbine intermediate-pressure section, turbine low-pressure section, and generator are arranged in a skewer shape, and the steam source and the turbine high-pressure section are connected by a main steam pipe through a steam control valve, and the turbine high-pressure section and the turbine middle The pressure section is a reheater,
In a steam turbine, the turbine intermediate pressure section and the turbine low pressure section are connected by a reheat steam pipeline with an intermediate check valve inserted, and the turbine intermediate pressure section and the turbine low pressure section are connected by a low pressure steam pipeline. A first sideway valve is inserted in a first sideway pipe that connects the turbine, and a second sideway valve is inserted in a second sideway pipe that branches from the inlet side of the turbine intermediate pressure section and connects to the condenser, A brake motor is directly connected to the shaft end of the generator, and when the steam turbine is loaded or disconnected, the brake motor causes the turbine shaft to rotate in the opposite direction, and an imbalance occurs between the output of the turbine shaft and the output of the generator. When the steam turbine overspeeds, the steam turbine is provided with an unbalanced load sensing circuit that provides an opening signal to a first sideway valve that extracts residual steam from each turbine section and sends it to a condenser, and a second sideway valve that outputs an opening signal. Prevention device.