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We are operating 9 nos of Frame-6 GTs with Mark V/VI control system. Recently we faced tripping on one machine during lightning. Interested to know the means to avoid damage to the cards and tripping of machine.
We had observed the tripping of one of GT on "High Exhaust Temp" during lightning. Following were our observation.
1)Readings of all thermocouples (of exhaust,bearing metals, wheel space, Lube oil headers, Bearing drains) were showing either extreme high or extreme low reading. Exhaust thermocouple readings normalised after 6 sec. And other reading got normalised after replacing the TCCA card only.
2)R –Processor P2 (Tag on: 96FG2A) transmitter channel component found burnt at TBQB card.
3)CPD transmitter found damaged.
Integrity of complete shielding cable/termination and earthing pit found OK.
My questions are:
1) Is someone using Surge Protector Devices with Mark-V/VI system and how is the performance of the SDP. Can SDP protect against false tripping?
2)Are some other users facing problem of tripping of GT during lightning? What are the actions taken to avoid tripping of GT during lightning.
3)GE normally provides T/C cables running to Mark System Panels. Does any other site use 4-20 mA signal for T/C readings?
We had observed the tripping of one of GT on "High Exhaust Temp" during lightning. Following were our observation.
1)Readings of all thermocouples (of exhaust,bearing metals, wheel space, Lube oil headers, Bearing drains) were showing either extreme high or extreme low reading. Exhaust thermocouple readings normalised after 6 sec. And other reading got normalised after replacing the TCCA card only.
2)R –Processor P2 (Tag on: 96FG2A) transmitter channel component found burnt at TBQB card.
3)CPD transmitter found damaged.
Integrity of complete shielding cable/termination and earthing pit found OK.
My questions are:
1) Is someone using Surge Protector Devices with Mark-V/VI system and how is the performance of the SDP. Can SDP protect against false tripping?
2)Are some other users facing problem of tripping of GT during lightning? What are the actions taken to avoid tripping of GT during lightning.
3)GE normally provides T/C cables running to Mark System Panels. Does any other site use 4-20 mA signal for T/C readings?