【 9 f gas turbine typical accident 】 The motor fan downtime

【 9 f gas turbine typical accident 】 Motor fan downtime 2019 - processing 05 - 14 a, the occurrence of the incident on January 23, 2010, unit 2 drag one run, AGC, the load of 650 mw; # 1, 2, gas turbine load of 230 mw, 190 mw turbine load, heating load 1200 gj/h. Then monitor disk researchers found that # 1 gas turbine MARK Ⅵ interface to send alarm ( Exhaust fan wind down) framework ‘EXH框架或# 2 BRG冷却TRBL - 卸载( Exhaust framework or # 2 bearing district cooling fan fault) ', immediately sent someone to the on-site check the fan and click MARK Ⅵ fan interface '# 2 LEAD' and the master reset button, the fan is still cannot be started. 14:01 points # 1 gas turbine start automatically load reduction, operators manual out of AGC, reduce the heat load, low load operation. 15:06 load dropped to 3 mw, scheduling downtime, 15:09 points # 1 gas turbine downtime. Second, the cause analysis found the # 1 check gas turbine tk - 88 2 fan motor stoppage, switch on the earthing protection action. Power cable connection open, the machine body measurement motor insulation of ontology, three relatively to 0. 1 megohm, manual disc motor fan can plate. Down the fan, the fan impeller fan blade tip of ontology have irregular pit damage, motor drive end bearing cover of ontology and oil baffle ring overheating and defect. Found after remove the fan impeller motor drive end bearing cover of ontology and oil baffle ring obvious damage, the oil retaining ring and the oil slinger will be removed after the found bearing cage, ball overheating deformation, friction between bearing outer ring and motor cover, bearing inner gear ring and rotor shaft friction obviously, inside the rotor shaft is oil baffle ring on the annular channel. Motor drive end did not see anything unusual. Take out the rotor found short circuit of stator end discharge marks, marks the end coil overheating, stator core chamber has a slight phenomenon, motor stator not drive on the end did not see anything unusual. As shown: from the failure phenomenon, motor drive end bearing for working at high temperatures for a long time, cause loss after bearing oil emulsification, bearing under dry state; Overheating bearing area, caused by the friction gradually caused the stator end area overheating, insulation aging is reduced, in the end of the stator winding interturn short circuit produce high temperature burning; Lack of grease is the immediate cause of the failure. Three measures to prevent, 1. Strengthen equipment defect management, the measures to prevent the loss of the operation of the standby equipment making, strengthening inspection and repair used equipment as soon as possible at the same time, guarantee the safe and stable operation of equipment. 2. Tk - 88 2 fan motor, will add, leads to the lateral of motor oil discharge hole, adding bearing temperature measuring element, uploaded to the monitoring of e/c rm. 3. Of the same type motor, with installation form motor census, confirmation, the health level of equipment arrangement of can not meet the requirement of the operation, the motor maintenance. 4. The collapse of the inspection of all the similar motor using minor repair time, replace the bearing, add oil. 5. The same type equipment, do a good job in spare parts for replacement maintenance on a regular basis. 6. Strengthen the equipment management, carefully check, in a timely manner to eliminate defects, make the backup device in good standby condition.