Jacking oil hose burst of 1000 mw generator bearing high temperature processing

Jacking oil hose burst of 1000 mw generator bearing 2018 - high temperature treatment 07 - 03 1, equipment introduction 1000 mw turbo-generator set for Shanghai steam turbine generator co. , LTD manufacture THDF type 125/67 million kilowatt generators, including 7 bearing ( Before the generator bearing) The diagram below. 2 problem description unit after restart after the trip, in the operation of no. 7 bearing multiple occurrences of bearing temperature climb, climb temperature time is 30 - every time 40 seconds, no obvious relation with load, bearing temperature can gradually back to normal after climbing to the peak, detailed in the following table. Examine the situation in the operation of the routine inspections of the lubricating oil system, without exception. In the operation of the inspection found no. 7 bearing of insulation is zero, there may be a generator rotor bearing discharge makes no. 7 in no. 7 bearing temperature rise. Parking will find: no. 7 bearing up after 7 bearing more than two root jacking oil pipeline rupture, sharply at the bottom of the no. 7 bearing rolled up, detailed below. 4 analysis according to the on-site inspection situation analysis, the failure reasons of jacking oil hose for the design life is insufficient, the original design should be more than five years, and the actual use only appeared more than three years burst; No. 7 bearing jacking oil pipeline burst, rotor jacking height is insufficient, make sharply crushed, damage, fall off sharply affect all lubricating oil quantity, will enter the clearance between the rotor and bearing, resulting in short-term rapid rise in the temperature of bearing. Later on no. 7 bearing with jacking oil hose for the replacement. But starting about 10 days later, no. 7 bearing again in 4. 7 ℃ climb, analysis considered the bearing to the bearing of insulation is zero, the rotor of the generator discharge may be another cause of bearing temperature, therefore took on the side of the generator excitation rotor mounted shaft grounding methods of dealing with the measurement device, specific to measure the size of the brush in the lateral excitation installation, measure the brush with lateral excitation by a secondary cable insulation bearing potential measurement on the terminal connection, terminal lead wire connected to the filter, filter through the earth ground. 5 run 1 month after treatment result, the no. 7 bearing temperature is stable, no climbing phenomenon occurred, the following figure.