电力系统保护与控制
電力繫統保護與控製
전력계통보호여공제
POWER SYSTM PROTECTION AND CONTROL
2014年
18期
132-138
,共7页
段涛%杨斌%李贤庆%彭东
段濤%楊斌%李賢慶%彭東
단도%양빈%리현경%팽동
阀水冷系统%直流停运%轴封渗水%电极结垢%隐患治理
閥水冷繫統%直流停運%軸封滲水%電極結垢%隱患治理
벌수랭계통%직류정운%축봉삼수%전겁결구%은환치리
valve water cooling system%HVDC equipment outage%shaft seal water seepage%electrode scaling%hidden troubles governance
以±500 kV 德阳换流站为例，介绍了主泵轴封渗水及均压电极腐蚀结垢两项可能导致直流设备停运的典型阀水冷系统隐患。通过多次处理轴封缺陷，并在设备运行过程中连续跟踪分析，基本确定气蚀振动是引发轴封渗水的原因。因此提出从电机选型、电机控制及主泵进出水管路改造三方面防控此类隐患的意见，并确定最经济稳定的改造方案为主泵进出水管路增加旁路的方式。利用停极机会检查电极结垢、腐蚀情况，判断电极结垢可能对直流输电系统造成的影响。通过结垢成分分析确定引发电极结垢的设备原因，采用冷却水介质换型解决了因水质原因而造成散热器腐蚀隐患。根据内水冷密闭结构提出了增加气囊的改造方案，在含氧量方面进行电极结垢控制。两项隐患的分析治理过程对新投换流站相关设备的选型及设计都有一定的指导意义，为已投换流站类似隐患分析提供了参考依据。
以±500 kV 德暘換流站為例，介紹瞭主泵軸封滲水及均壓電極腐蝕結垢兩項可能導緻直流設備停運的典型閥水冷繫統隱患。通過多次處理軸封缺陷，併在設備運行過程中連續跟蹤分析，基本確定氣蝕振動是引髮軸封滲水的原因。因此提齣從電機選型、電機控製及主泵進齣水管路改造三方麵防控此類隱患的意見，併確定最經濟穩定的改造方案為主泵進齣水管路增加徬路的方式。利用停極機會檢查電極結垢、腐蝕情況，判斷電極結垢可能對直流輸電繫統造成的影響。通過結垢成分分析確定引髮電極結垢的設備原因，採用冷卻水介質換型解決瞭因水質原因而造成散熱器腐蝕隱患。根據內水冷密閉結構提齣瞭增加氣囊的改造方案，在含氧量方麵進行電極結垢控製。兩項隱患的分析治理過程對新投換流站相關設備的選型及設計都有一定的指導意義，為已投換流站類似隱患分析提供瞭參攷依據。
이±500 kV 덕양환류참위례，개소료주빙축봉삼수급균압전겁부식결구량항가능도치직류설비정운적전형벌수랭계통은환。통과다차처리축봉결함，병재설비운행과정중련속근종분석，기본학정기식진동시인발축봉삼수적원인。인차제출종전궤선형、전궤공제급주빙진출수관로개조삼방면방공차류은환적의견，병학정최경제은정적개조방안위주빙진출수관로증가방로적방식。이용정겁궤회검사전겁결구、부식정황，판단전겁결구가능대직류수전계통조성적영향。통과결구성분분석학정인발전겁결구적설비원인，채용냉각수개질환형해결료인수질원인이조성산열기부식은환。근거내수랭밀폐결구제출료증가기낭적개조방안，재함양량방면진행전겁결구공제。량항은환적분석치리과정대신투환류참상관설비적선형급설계도유일정적지도의의，위이투환류참유사은환분석제공료삼고의거。
Taking the ± 500 kV Deyang Converter Station as an example, the main pump shaft seal water seepage and the scaling of voltage sharing electrodes are two typical hidden troubles which may cause HVDC equipment outage. Through the defects treatment of shaft seals for many times, tracking and analysis continuously in the operation process of equipment, it can be basically determined that cavitation vibration is the reason which causes shaft seal water seepage. In order to prevent and control this hidden trouble, three improving suggestions are put forward, including motor selection, motor controlling and improving the main pump outlet pipe road, and then the improvement program is determined as adding the bypass in the main pump outlet pipe road for its economy and stability. Electrode scaling and corrosion is checked to determine the influence of HVDC transmission system caused by electrode scaling, the cause of the electrode scaling is determined according to the analysis of the constituents content in scaling electrode, and then the electrodes are descaled. The hidden trouble of radiator corrosion caused by water quality is solved by changing the cooling water medium, and according to the closed structure of inner cooling water system, an improved scheme by adding gasbag is designed to descale the electrodes. Analysis and governance of the two hidden troubles will provide the guidance for selecting and designing of related equipment in new converter, and provide a reference to analyze the similar hidden hazard for completed converters.
