ANALYSIS OF LVDT FAILURE FOR GOVENOR VALVE OF STEAM TURBINE EQUIPPED FOR SUBCRITICAL 600 MW UNIT AND RETROFIT THEREOF

ZHU Ke; GAO Shenghui; ZHANG Fuzhong; GUO Zhijun; LI Tingyu Guohua Jinjie Energy Co Ltd

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ANALYSIS OF LVDT FAILURE FOR GOVENOR VALVE OF STEAM TURBINE EQUIPPED FOR SUBCRITICAL 600 MW UNIT AND RETROFIT THEREOF

Thermal Power Generation Vol. 40, Issue 1, Pages: 79-81(2011)

更新时间：2025-09-28

- ANALYSIS OF LVDT FAILURE FOR GOVENOR VALVE OF STEAM TURBINE EQUIPPED FOR SUBCRITICAL 600 MW UNIT AND RETROFIT THEREOF
- 作者机构：
  
  国华锦界能源有限责任公司
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK267
- Published：2011
- 稿件说明：
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ZHU Ke, GAO Shenghui, ZHANG Fuzhong, et al. ANALYSIS OF LVDT FAILURE FOR GOVENOR VALVE OF STEAM TURBINE EQUIPPED FOR SUBCRITICAL 600 MW UNIT AND RETROFIT THEREOF[J]. Thermal Power Generation, 2011, 40(1): 79-81.
DOI：

ZHU Ke, GAO Shenghui, ZHANG Fuzhong, et al. ANALYSIS OF LVDT FAILURE FOR GOVENOR VALVE OF STEAM TURBINE EQUIPPED FOR SUBCRITICAL 600 MW UNIT AND RETROFIT THEREOF[J]. Thermal Power Generation, 2011, 40(1): 79-81. DOI：

摘要

在分析汽轮机调节阀线性可变差动变送器(LVDT)常见故障的基础上

提出了调节阀阀杆区域加装防转装置和万向节装置

调整LVDT同心度

增设调节阀行程偏差大报警逻辑等改进措施

并以此对国华锦界电厂亚临界600 MW机组汽轮机调节阀LVDT进行了改进。经过1年的试运行

改进后的调节阀未再发生LVDT反馈杆与套筒摩擦和LVDT反馈杆变形的现象

LVDT各部件受力均匀

阀位反馈测量准确

调节阀反馈定位精度和连续运行可靠性显著提高。

Abstract

On the basis of analysing common failures occurred on the linear variable differential transducers(LVDT) of steam turbines

some retrofit measures

i.e.adding rotation-preventing device in the valve stem region of the govenor valve

adding universal coupling facility

adjusting the concentricity of LVDT

adding alarm logic for large deviation of govenor valve's stroke

etc.

have been put forward

and the LVDT of govenor valve for steam turbine of subcritical 600 MW unit in Guohua Jinjie Power Plant being retrofitted according to the said measures.After retrofitting

the phenomena occurred on the govenor valve

such as friction between feedback stem of LVDT and the sleeve

deformation of feedback stem in LVDT etc.

have never occurred again in trial operation of one year.All parts of LVDT are stressed uniformly

the feedback of valve position being accurately measured

the setting precision of govenor valve's feedback and the reliability in continous operation have been remarkabally enhanced.

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