Cause analysis and treatment of extraction check valve abnormal closing for steam turbine

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- Cause analysis and treatment of extraction check valve abnormal closing for steam turbine
- Ningxia Electric Power Issue 5, (2013)
- 作者机构：
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.1672-3643.2013.05.016
  CLC：
- Published Online：05 November 2020，
  
  Published：2013
- 稿件说明：
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SHANG Xiaojun. Cause analysis and treatment of extraction check valve abnormal closing for steam turbine[J]. Ningxia electric power, 2013, (5).
DOI：

SHANG Xiaojun. Cause analysis and treatment of extraction check valve abnormal closing for steam turbine[J]. Ningxia electric power, 2013, (5). DOI： 10.3969/j.issn.1672-3643.2013.05.016.

针对某电厂1、2号发电机组在运行中频繁发“发电机跳闸”报警

引起机组热工保护PLC动作

使抽汽逆止门关闭的问题进行分析

提出改进措施。分析结果表明:故障产生的原因是保护电源受到干扰

干扰信号通过J1、J3长线路上的等效电容进入到PLC中

引起了“发电机跳闸”保护误动。对原发电机跳闸信号线路进行改进后

抽汽逆止门异常关闭的现象不再发生。

Aiming at the problem of No. 1 and No.2 units in a power plant frequently occurring gen?erator trip in operation

causing programmable logic controller (PLC) action

bringing on extractioncheck valve closing

to make analysis. The analysis result shows that the causes of the problem arepower source of protection device get disturbance

the disturbance signal come into PLC throughequivalent capacity on J1 and J3 lines

lead to protection device misoperation of generator trip. Afeterimproving trip signal line of the original generator

the phenomenon of extraction check valve abnor?mal closing have never appearance.

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