ANALYSIS OF HARD-WIRED TRIP CIRCUIT DESIGN FOR MFT OF LARGE-CAPACITY UNITS

JIN Yunli Siemens Power Plant Automation Co Ltd

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ANALYSIS OF HARD-WIRED TRIP CIRCUIT DESIGN FOR MFT OF LARGE-CAPACITY UNITS

更新时间：2025-09-28

- ANALYSIS OF HARD-WIRED TRIP CIRCUIT DESIGN FOR MFT OF LARGE-CAPACITY UNITS
- Thermal Power Generation Vol. 39, Issue 11, Pages: 73-76(2010)
- 作者机构：
  
  西门子电站自动化有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM621.9
- Published：2010
- 稿件说明：
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JIN Yunli Siemens Power Plant Automation Co Ltd. ANALYSIS OF HARD-WIRED TRIP CIRCUIT DESIGN FOR MFT OF LARGE-CAPACITY UNITS[J]. Thermal power generation, 2010, 39(11): 73-76.
DOI：

JIN Yunli Siemens Power Plant Automation Co Ltd. ANALYSIS OF HARD-WIRED TRIP CIRCUIT DESIGN FOR MFT OF LARGE-CAPACITY UNITS[J]. Thermal power generation, 2010, 39(11): 73-76. DOI：

摘要

针对锅炉主保护设计中存在的拒动和误动问题

提出了一种新的总燃料跳闸(MFT)硬跳闸回路设计方案

重新设计了手动跳闸方式和DCS输出MFT继电器3取2动作方式

该方案在确保MFT不拒动的前提下

降低了MFT误动的可能性。若DCS电源失去作为MFT动作条件

MFT硬跳闸回路电源可直接采用DCS电源

并按照负逻辑设计;MFT硬跳闸回路采用正逻辑和独立电源设计时

必须将手动MFT按钮动作作为MFT软逻辑跳闸条件;手动MFT按钮的触点连接方式对MFT硬跳闸回路拒动的发生概率有很大影响。

Abstract

Directing against the problems of miss-operation and mal-function existing in the main protection design of boilers

a new design scheme of hard-wired trip circuit for main fuel trip(MFT) has been put forward

and the manual botton trip and the operation mode 2 out of 3 for MFT relay acted by DCS being redesigned.The above-mentioned design scheme can reduce the posibility of mal-function for MFT under prerequisite of ensuring no miss-operation of MFT.If the lose of power supply in DCS is used as the condition of MFT's operation

the power supply of hard-wired trip circuit for MFT can directly use the power supply of DCS

and being designed according to negative logic;in the case of hard-wired trip circuit for MFT is designed to adopt positivelogic and independent power supply

it is necessary to use the action of manual MFT botton as the trip condition of MFT soft logic;the connection mode of contacts on manual MFT botton has large influence in hard-wired trip circuit for MFT.

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