Integrated Intelligent Energy

Operation mode of power units of Togtoh Power Generation Company Limited under extreme weather

FU Junjie，DU Xilai

2013, 35(10): 1-5.

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Abstract:The severe weather occurred frequently in whole country for recent years, and this forms a great threat for stable operation of transmission lines and power plants. Aiming at the “11.5” accident of Togtoh Power Generation Company Limited in 2012, in which three of four output transmission lines of the company tripped successively due to severe snow and ice disasters, the operation mode of power units under extreme weather was put forward. The measures for resuming important power sources after the whole plantscope auxiliary power outage accident occurred were introduced, which are useful for ensuring the equipments of the power plant to operate safely and stably.

Influence of subsynchronous resonance on power unit under abnormal operation condition of power system

HUANG Xiaofeng

2013, 35(10): 6-9.

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Abstract:In order to increase the power transmission capacity, the series compensation devices were installed for the four output transmission lines of Togtoh Power Generation Company Limited. In order to restrain the subsynchronous resonance, which occurred after the series compensation devices were put into operation, the blocking filters were added to neutral point sides of each phase of each main transformer. In the same time, the unit shaft system torsional vibration protection and the asynchronous selfexcitation protection were configured. The reasons of subsynchronous resonance and the adopted targeted restraining measures were expounded. By means of analysis on actions of unit shaft system torsional vibration protection and the asynchronous selfexcitation protection under abnormal system operation condition, the effect of the blocking filter to restrain subsynchronous resonance was verified.

Optimized design of black start power supply of Togtoh Power Generation Company Limited and application

WANG Huifeng

2013, 35(10): 10-14.

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Abstract:Secondary disasters will occur inevitably after power outage in whole plant scope, so to implement black start quickly is of important significance for a power plant. The correct selection of black start supply is the foundation of successful blackstart. Aiming at the tripout accident of three of the four output transmission lines of Togtoh Power Generation Company Limited at November 2012 caused by extreme weather, a optimized design of blackstart power supply system was carried out, in which the selection of the power source place, the protection configuration, the operation mode, the fivepreventing system, the electric energy metering system and others were considered. After the scheme was implemented in Togtoh Power Generation Company Limited, the blackstart was realized successfully and effectively, and favorable economic benefit and social effect were obtained.

Influence of freezing rain weather on 500kV transmission line and control measures

JIA Chenglin

2013, 35(10): 15-18.

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Abstract:The phenomenon of output transmission line tripout accident successively occurred in Togtoh Power Generation Company Limited caused by freezing rain disaster and the accident treatment process were introduced. The influence of extreme weather on the transmission line was analyzed, and the formation conditions of the line ice coating and the characteristics of the ice coating were analyzed too. The preventive measures of the accident and several effective deicing methods were proposed.

Discussion of safe operation mode of power units after tripout accident of 500kV output lines

WANG Qianqian

2013, 35(10): 19-22.

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Abstract:When the power grid accident occurred, the power plants must be able to execute the instructions from the dispatching department automatically and quickly to avoid enlarging the power grid accident. At November 5, 2012, three of four output lines of Togtoh Power Generation Company Limited tripped, only one line remained in normal operation. Aiming at this accident, the influence of the tripout accident of output line on the power plant, the accident treatment process in the power plant side and the response scheme were expounded. The feasibility of the scheme was demonstrated, and some shortcomings needing to be improved of the scheme were pointed out.

Black start measures of power units of Togtoh Power Generation Company Limited after all output transmission lines tripped

REN Qiang

2013, 35(10): 23-26.

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Abstract:Due to the extreme rain and snow weather occurred at the winter of 2012, three of four 500kV output transmission lines of Togtoh Power Generation Company Limited tripped successively. Aiming at the probable accident of all four 500kV output lines tripping, the black start measures of units of Togtoh Power Generation Company Limited were proposed so as to ensure safety of the unit equipments.

Emergency treatment measures of 600MW unit of Togtoh Power Generation Company Limited after its output line tripped

SHEN Zhibin

2013, 35(10): 27-29.

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Abstract:Combining with the tripout accident of three 500kV output lines of Togtoh Power Generation Company Limited, the measures to quick recover the common service system operation and to ensure the auxiliary steam supply after the 500kV output line of the 600MW units of the company all tripped were introduced. The key points and operating steps in treating of this kind of accidents were emphasized. It was pointed out that after the 500kV output lines all tripped, to depend on the power units of Hohhot Thermal Power Company Limited is the necessary method to ensure the units of Togtoh Power Generation Company Limited to stop safely and to avoid the main and auxiliary devices damage accident.

Optimization of independent operation scheme of single power unit after output lines all tripped

YI Weiguo

2013, 35(10): 30-32.

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Abstract:After the 500kV output lines of Togtoh Power Generation Company Limited tripped successively, the power unit No.8 operated alone and provided the auxiliary power of whole plant. The operation condition was introduced. The treatment plan for independent operation of the unit No.8 was analyzed, the shortcomings of the plan were pointed out, and the plan was perfected.

Treatment measures of interrupt accident of water circulating system for auxiliary devices of Togtoh Power Generation Company Limited and prearranged plan

SHANG Jian

2013, 35(10): 33-35.

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Abstract:Due to the extreme rain and snow weather occurred at the winter of 2012, three 500kV output transmission lines of Togtoh Power Generation Company Limited tripped successively. The line tripout accident impacted on the water circulating frequency converter, which caused the circulating water supply of unit No.8 of project phase Ⅳ to interrupt instantly. The whole accident process was analyzed and summarized. A circulating water interruption handling scheme was proposed, and the control measures to prevent circulating water interruption accident were summarized.

Measures for ensuring normal operation of auxiliary steam system

JIAO Kaiming

2013, 35(10): 36-38.

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Abstract:The practical variation situation of the auxiliary steam system under shutdown accident of part of units or all units was introduced. The boiler heat storage capacity, the boiler residual heat and the characteristics of the boiler in hot quick startup or shutdown were analyzed. Several measures for normal operation of the auxiliary steam system were put forward, which are helpful to ensure the auxiliary steam system to operate safely and reliably.

Analysis on tripping process of output transmission lines

CHEN Xiaoguang

2013, 35(10): 39-41.

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Abstract:Three output transmission lines of Togtoh Power Generation Company Limited tripped successively due to heavy snow weather, and this caused emergency shutdown of multiple units. The accident situation was expounded. The reasons of generator tripping leaded by output transmission line tripping and the harm of output transmission line tripping were analyzed. The emergency countermeasures were formulated, and the normal power transmission of the line was ensured.

Control of turbine lubricating oil during whole plantscope power outage

XIA Zunyu

2013, 35(10): 42-43.

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Abstract:After a whole plantscope power outage accident occurred, the normal operation of the turbine lubricating oil system is one of the necessary conditions for ensuring the units safe shutdown and preventing the accident of lubricating oil interruption and bearing bush burning. Combining with practical example, the operation mode of oil pump of lubricating oil system and the reasons causing the turbine lubricating oil temperature rising were analyzed. The measures were proposed to ensure normal operation of the turbine lubricating oil system under whole plantscope power outage condition.

Analysis on treatment of “11.5” output line tripout accident of Togtoh Power Generation Company Limited

ZHANG Zeliang

2013, 35(10): 44-45.

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Abstract:At November 5, 2012, three output transmission lines of Togtoh Power Generation Company Limited tripped successively. Aiming at this accident, the measures to ensure the supply of auxiliary steam after the units shut down were analyzed, and the matters needing attention in unit stopping were put forward, which ensure the units to operate safely and stably.

Safe shutdown scheme of power units after 500kV output line tripped

NIU Youlong

2013, 35(10): 46-48.

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Abstract:Extreme rain and snow weather occurred at the winter of 2012, and this caused three 500kV output transmission lines of Togtoh Power Generation Company Limited tripped successively. The operation mode of companywide units before the lines tripped and the treatment process of the line tripout accident were introduced. The measures to ensure the units to stop safely and orderly and to prevent the auxiliary power system and auxiliary steam system to be all failure after partial or all 500kV output lines tripped were discussed, which are helpful to avoid damage of unit equipments.

Analysis of feasibility of single power unit independent operation mode providing auxiliary power of whole plant

NIE Shuoye

2013, 35(10): 49-51.

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Abstract:The main connection of the Togtoh Power Generation Company Limited was introduced. Based on this, the risk factors of voltage outage on 500kV line caused by shutdown of all power units were analyzed. Starting from the viewpoints of frequency and voltage control and operation adjustment of the generator, the feasibility to provide the companywide auxiliary power system by one unit No.4 under condition of all the four output line tripout was discussed.

Operating methods of power unit No.5 in output line tripout accident treatment of Togtoh Power Generation Company Limited and envisioning

DING Zhihua

2013, 35(10): 52-53.

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Abstract:At November 5, 2012, the output transmission lines of Togtoh Power Generation Company Limited tripped. The operating process of power unit No.5 was analyzed. In order to ensure safe and stable operation of unit No.5, the accident treatment scheme was evaluated, and some possible accident developments and relevant countermeasures were envisioned.

Response strategy to face power plantwide power outage

LI Jiancheng

2013, 35(10): 54-55.

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Abstract:In order to face extreme malignant accident of power plantwide power outage, very high accident handling ability and flexible problemsolving ability are needed for the operators. In order to prevent other accidents may caused by the accident of power plantwide power outage and to ensure the stopped units to restart orderly, according to the problems existing in Togtoh Power Generation Company Limited, the effective and feasible controlling strategy and solutions were put forward.

Operation mode of single power unit providing auxiliary power

HUANG Zhijun

2013, 35(10): 56-57.

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Abstract:Due to continuous heavy snowfall weather in area of north china, the three of four output transmission lines of Togroh Power Generation Company Limited tripped, and six of total eight units were shut down. If the only remained output transmission line trips, then the all output transmission lines of the plant will interrupt. Further, a severe situation may occur, in which the auxiliary power supply and auxiliary steam source are all interrupted. Some effective measures were adopted to ensure one power unit to operate normally, then the auxiliary power supply and auxiliary steam source will be available for other unit restarting.

Adjustment measures of boiler drum water level of unit No.8 in Togtoh Power Generation Company Limited in independent operation

GAO Fei

2013, 35(10): 58-59.

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Abstract:In the “11.5” accident of Togtoh Power Generation Company Limited, only one of four output transmission lines remained in normal operation. Meanwhile the unit No.8 was operating independently and shouldered important responsibility to provide auxiliary power for whole plant. The adjustment of boiler drum water level influences on unit safe operation directly, and the incorrect adjustment may cause accident of boiler fire extinction and unit shutdown. Taking the drum water level adjustment of unit No.8 in independent operation as example, the related problems were analyzed, and the relevant adjustment measures were given.

Treatment Measures of auxiliary power outage accident in operation of units of Togtoh Power Generation Company Limited

WANG Nan

2013, 35(10): 60-62.

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Abstract:The main equipments of Togtoh Power Generation Company Limited were introduced. The reasons of auxiliary power outage accident were analyzed. The situations of the units after auxiliary power failed and the influence of the accident on normal operation were summarized. The treatment measures after the auxiliary power failed and the recovery steps of electrical devices were expounded. The result in this paper ensures to give correct direction for accident treatment, to enhance ability of quick response and emergency treatment and to minimize the losses caused by the accident.

Precontrol plan for companywide auxiliary power outage of Togtoh Power Generation Company Limited

LI Menghu

2013, 35(10): 63-65.

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Abstract:Aiming at the tripout accident of partial 500kV output transmission lines of Togtoh Power Generation Company Limited, based on the special connection mode of auxiliary power systems of Togtoh Power Generation Company Limited and Hohhot Thermal Power Company Limited, it was proposed that after the auxiliary power system of Togtoh Power Generation Company Limited is all failure, the Hohhot Thermal Power Company Limited will appointed to provide the auxiliary power of Togtoh Power Generation Company Limited. The switching steps and the matters needing attention in the switching process were described, which are useful for safe and stable operation of the power units.

Analysis on safety emergency disposal of power plant and countermeasures

LI Xingwang

2013, 35(10): 66-68.

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Abstract:Taking the “11.5” accident of Togtoh Power Generation Company Limited as example, the daily emergency management, the scheme formulation, the disposal countermeasures and the process control were analyzed. The importance and the consideration factors of previous preparation for abnormal transmission line tripping, the operation mode of the command system in disposal process, the factors of exception handling and the prevention of secondary disasters were expounded. It was pointed out emphatically that must do our best to control, lighten and eliminate the damage caused by electric safety accident and to improve the ability of emergency disposal further.

Analysis on “11.5” accident of Togtoh Power Generation Company Limited

WANG Liping

2013, 35(10): 69-71.

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Abstract:The process of the “11.5” accident was introduced. The reasons of the accident were analyzed. The preventive measures for the power transmission and transformation equipments to cope with severe weather were given. The concrete overhaul items and the management standard were shown clearly. The results of this paper provide reference for dealing with similar problems.

Analysis on disposal of emergency shutdown accident of Togtoh Power Generation Company Limited

ZHANG Longgang

2013, 35(10): 72-73.

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Abstract:At November 5, 2012, three of output transmission lines of Togtoh Power Generation Company Limited tripped, and this caused the units No.1, 2, 3 and 5 shut down urgently. The emergency command management, the equipment management, the operation management, the coldproof and antifreeze, the logistical support and others in accident treatment process were analyzed, and the disposal methods were given, which provide reference for similar event treatment.

Preventive measures of thermal control system during power grid line fault treatment

CHEN Lei, WANG Kaimin, LONG Junfeng

2013, 35(10): 74-75.

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Abstract:A heavy snow suddenly occurred in a north region, and this caused the transmission line tripout accidents of YuanAn Line I and two YuanBa lines. Only the YuanAn Line II remained in working condition, and the unit No.4 and unit No.8 still were operating with 300MW load. Togtoh Power Generation Company Limited quickly organized related professionals, started the emergency plan, and adopted effective preventive measures, which ensured the remained units to operate safely and stably.

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