Analysis of Existing Problems in the Valve Cooling System for HVDC Transmission Project

TIAN Qing

doi:10.13296/j.1001-1609.hva.2012.08.016

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Analysis of Existing Problems in the Valve Cooling System for HVDC Transmission Project

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- Analysis of Existing Problems in the Valve Cooling System for HVDC Transmission Project
- High VoltageApparatus Vol. 48, Issue 8, Pages: 80-85(2012)
- 作者机构：
  
  南方电网超高压输电公司检修试验中心
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2012.08.016
  CLC： TM721.1
- Published：2012
- 稿件说明：
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[1]田庆.直流输电工程阀水冷系统缺陷分析[J].高压电器,2012,48(08):80-85.

TIAN Qing. Analysis of Existing Problems in the Valve Cooling System for HVDC Transmission Project[J]. High voltageapparatus, 2012, 48(8): 80-85.
[1]田庆.直流输电工程阀水冷系统缺陷分析[J].高压电器,2012,48(08):80-85. DOI： 10.13296/j.1001-1609.hva.2012.08.016.

TIAN Qing. Analysis of Existing Problems in the Valve Cooling System for HVDC Transmission Project[J]. High voltageapparatus, 2012, 48(8): 80-85. DOI： 10.13296/j.1001-1609.hva.2012.08.016.

摘要

在直流输电工程中

辅助系统包括阀水冷系统、消防系统、空调系统和工业生活水系统。阀水冷系统是用于对直流输电核心元件可控硅阀进行冷却的系统

该系统的运行情况直接影响直流输电系统的运行

在所有辅助系统中只有阀水冷系统能够引起单双极阀闭锁

由此可见阀水冷系统的重要性。笔者介绍了阀水冷系统的基本原理

分析了系统运行中存在的问题

如:CCP不能体现系统冗余性、软化单元再生的优先级低于系统补水的优先级、没有监视软化单元再生效果的功能、冷却塔喷淋管设计不合理、外冷水控制系统无喷淋泵出水监视信号、平衡水池水质较差等。相应的解决办法为:完善CCP控制软件、调整软化单元再生的优先级高于系统补水的优先级、在再生回路中增加电导率表和流量表、将喷淋管的末端引至冷却塔外部

并加装冲洗阀门、加装喷淋泵出水流量监视装置、更改排泄阀的控制程序。这对于今后新建直流输电工程有借鉴意义

并能提高现有直流输电工程中阀水冷系统的稳定性和可靠性。

Abstract

In HVDC transmission project

valve cooling system is used to cool the thyristor valve

a core component in DC transmission system

its operation state influences the operation of DC transmission system directly.Valve cooling system can cause lock of monopolar or bipolar valve.The author introduces the basic principle of valve cooling system

and analyzes the existing problems during its operation

e.g.the cooling control and protection（CCP）cannot reflect system redundancy

the priority of softening unit recovery is lower than that of system water replenishing

the monitoring signal of spray pump in outside CCP is absent

the design of cooling tower shower is irrational

no monitor is equipped for the quality of softening unit recovery

and the water quality in equalizing reservoir is poor.Corresponding methods are provided

including modifying CCP control software

making priority of the softening unit recovery higher than that of the system water replenishing

setting gauges in the softening unit recovery loop to detect electric conductivity and flow rate

extending the shower terminal outside the cooling tower and adding flushing valve at the terminal

installing water flowmeter to monitor output of the spray pump

and recoding the control program of outlet valve.This study is expected to be helpful in enhancing stability and reliability of the valve cooling system in existing HVDC projects.

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