B
AHop start in our unit with out any alarm of 63HQ of Frame VI machine having Mark VI control system. Actual reason of AHOP is unknown. May be the possibility of MHOP problem or Servo current changed from -4.5 to -31.1 before AHOP start.
1.GT-1 load dropped to 17.7 MW from 24.2MW in a matter of 960 msec.
2.GCV position changed from 45.48 % to 32.15%, whereas command for GCV opening was 46.2-47.8%
3.GCV servo current changed -4.35 to -31.6 %
4.All parameters started moving towards previous values, approx 500msec before AHOP running alarm appeared
In mark vi system above observation were found before AHOP start.
Please suggest to analyze the problem
1.GT-1 load dropped to 17.7 MW from 24.2MW in a matter of 960 msec.
2.GCV position changed from 45.48 % to 32.15%, whereas command for GCV opening was 46.2-47.8%
3.GCV servo current changed -4.35 to -31.6 %
4.All parameters started moving towards previous values, approx 500msec before AHOP running alarm appeared
In mark vi system above observation were found before AHOP start.
Please suggest to analyze the problem