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 guangdong province yuedian group shajiao c power plant    

presenter：dong jianjun

   there are three 660mw generator unit in shajiao c power plant，totally including 9 bcps，3bcps in each unit。the manufacturer of bcp is uk taylor company，type is u600h492，nominal voltage：3kv，rated power：448kw.

   before 2000， our factory due to the constraint and the quality of on-site maintenance and bcp motor are only after problems for overhauling, therefore we have six sets of bcp motor replacing the stator winding, early a bcp motor repair had asked the factory to repair, not only the high cost and time limit for a project is not guaranteed, after a few all by hefei anhui motor repair, besides reduce the cost, will also lead insulation class by 3 kv up to 6 kv, the service life of the motor is greatly improved, has more than ten years not to change the winding

：cai guangde

our plant 300 mw grade unit total have 12 sets of bcp, using heywood 200 kw bcp,  be put into commercial operation in succession since 2004, after running for a period of time， the insulation resistance varying degrees of decline.to solve above problems, through investigation, jiangsu jianbi power plant, china resources power plant in nanjing, jiangsu summer port power plant, jiangsu xu tong power plants such as power plants are a similar situation occurred with our company.guodian jianbi power plant in september 2004 to june 2005, respectively, of 6 sets of bcp failure in a period of 1 year or so。

for frequent problems, through professional of a lot of research work and related units, confirm the original manufacturer in the process there is no guarantee that the bcp run for a long time, at the scene of the multiple treatment cannot meet the requirements.at this point, to the nearest taylor company in kunshan overhaul repair technology no longer have hope.eventually determined by the company leadership, 4 sets of a total of 12 units of 300 mw grade unit is changed by hefei wanhua.in the unit after repair, on october 9, 2008 -- during the period of january 13, 2010, because of low insulation resistance problem for bcp motor commissioned by wanhua modification.from the point of the modified operation, all above 1000 m ω, insulation resistance in the operation of the running current decline in 1 ~ 2 a, small vibration (0.02 mm)

：wu junfei

after our factory unit # 1, # 2 bcp starts, we found that the motor chamber temperature rise quickly, we doubt that caused by mesh jams, water boiler, demolition of mesh, but after cleaning， restart still can't solve the problem.the rotor stuck, then, we send the pump to wanhua to overhaul. after repair，the running effect is good.subsequent improvement measures are as follows: the original built-in filter change to wanhua homemade external type magnetic filter, increase the filter area。magnetic filter can remove iron and other sundry, prevent filter blockage, and set the isolation valve, can be carried in the operation of the cleaning.after modification, multiple unit start-stop motor temperature anomaly has not been happened.

：yang xiaofei

my company occurred twice in the operation of the import bcp stator insulation breakdown fault, many times occurrences of the stator insulation resistance reduced and the numerical oscillation problem，then we outsourced the original motor manufacturers and wanhua.in order to shorten the bcp repair period in 2006, my company authorized wanhua design and manufacture a lbm535-210/4 bcp motors whole machine, and put into use in november 2007.

lbm535-210/4 domestic bcp motor，the installation size meet the requirement of the site, and installed a water pressure test, has the safe and stable operation for nearly six years, operation parameters such as current, sound, vibration, temperature stability is normal, normal bcp power, meet the requirement of unit operation, and the test run for a long time, is better than that of the original taylor.

after our company reserves in wanhua lbm535-210/4 bcp motor, the unit during the minor inspection to complete furnace pump motor replacement work, shorten the furnace pump repair period, also shortens the time of machine stop and accordingly for my company to create a very substantial benefit.

 

 

 

 

 

attached：statistical table of service life after bcp change winding from qinghuang island powerplant

after change winding，service life statistical table of uk tyalor

overhaul company	overhaul time（change winding）	damage time	service life
	september，2001	march，2004	2 years 6 months
uk tyalor	february， 2002	november，2007	5 years 9 months
uk tyalor	may，     1999	january，2005	5 years 8 months
uk tyalor	january，  2001	january，2005	4 years

 

after change winding，service life statistical table of wanhua

overhaul company	overhaul time（change winding）	damage time	service life
hefei wanhua	february，2003		not broken yet
hefei wanhua	november，2003	september，2011	7years 8 months
hefei wanhua	march，2004	september，2010	6years 5 months
hefei wanhua	february，2005		not broken yet
hefei wanhua	february，2005		not broken yet
hefei wanhua	november，2007		not broken yet

 

：hu xinyue

our motor overhaul are sent in hefei wanhua motor technology development co., ltd for repair.running state of the equipment is always fine so far.an a-class overhaul in 2008, at the same time in the process of the three sets of furnace water pump motor installation, cause the damage of the mission busy construction accidents.in this case, we will contact the chemical company of anhui province, the day will appoint someone to our factory, after discussion decided to remove the b pump.to remove the abnormal situation, the original impeller motor flange standard height should be 570.0 571.5 mm, but have shrink down to 20-30 mm, and the impeller is oblique.at the same time inspection found that the pump shell diffuser, guide blade all craze, wear ring also have indentation.then immediately decided to open another two furnace water pump a and c.through inspection found that the extent of the damage similar to b, c pump pump pump shell, a diffuser with little damage to wear ring.our factory will be three sets of furnace water pump motor respectively to the disintegration of hefei anhui company for inspection and repair.after two days of time, and the furnace water pump installation work completed.09 minor repair when we made a entrust shanghai power of complete sets of boiler circulation ratio test, the data are within the scope of the qualified.repair of furnace water pump running up to now everything is normal, a total of 5 years and 3 months.

through this accident, we draw profound lessons.we should give our heartfelt thanks to anhui hefei company technical support, in our most difficult time, can lend a hand in time, day and night, especially mr.yao, potential is high but also personally to the scene, and we discuss countermeasures, troubleshooting.thank you, can only utter a heartfelt. wanhua company not only skillful, and good faith, high efficiency, we can have such companies in electric power industry, security power had adequate technical support and care, and finally, thank mr.yao again, and thank all the staff of wanhua。

 

huaneng international power group yuhuan power plant    

presenter：wang guoyou

water circulation pump start # 2 boiler in our plant, 3 hours later, the current fluctuation and motor upper chamber cooling temperature began to rise, analysis of the pump motor bearing has been damaged, can not run normally, need to be returned to the factory maintenance.

   by hefei wanhua change motor technology development co., ltd. will this furnace water pump motor for the collapse of thrust block on one of the thrust bearing and thrust plate bearing grinding surface wear is most serious, at the same time, the impeller, diffuser, guide bearings, bushings, under thrust block of thrust bearing and thrust plate bearing grinding surface is also under wear, and the motor windings in the    dirt.

   by our factory and hefei wanhua common analysis, three renovation of furnace water pump motor: cancel the motor built-in filter, on the outside of the motor installation filter area larger external magnetic filter,...after transforming effect is good, the parameter is stable.