MARK-V control system is installed on one of our two gas turbines.
Mark-V
125VDC supply ground problem appeared intermittently for past few
years.
In Turnaround 2010 instrument team rectified this ground fault.
This report gives a brief overview of...
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MARK-V control system is installed on one of our two gas turbines.
Mark-V
125VDC supply ground problem appeared intermittently for past few
years.
In Turnaround 2010 instrument team rectified this ground fault.
This report gives a brief overview of nature of job performed by
instrument team.
The report also presents a comparative analysis of
complexity of ground fault rectification procedure in MARK-II and MARK-V
system.
INTRODUCTION
Mark-V has two main types of power supply sources
• 125VDC
• 125VAC
125VDC is further regulated to ±24 VDC, ±15 VDC and 5VDC.
125VDC continuously monitored by a ground detector soft relay L64D.
In
case positive or negative pole of supply set out limit then 125VDC SUPPLY
GROUND FAULT alarm appears in MARK-V <I> alarm list.
I N S I D E T H I S I S S U E
1 Introduction
2 Background
3 125VDC ground fault repair
4 MARK-II vs MARK-V
“MARK-V system gives
valuable ground fault
diagnostic information
and voltage level
variation”
Adeel Imtiaz
FFC, Pakistan
B
Less