Bus Instrumentation Calibration
			12/09/98 JHI



Coil Resistance Measurements

	. verify that 5 amp bus fuses are installed and continuous on
	  the 5 volts source supplies

	. verify that 1/2 amp bus fuses are installed and continuous on
	  the voltage taps across the bus

	. turn on 5 volt supplies and verify readings at PLC
 

Voltage Measurements

	. remove 1/2 bus fuses and apply +100, 0, and -100 volts with
	  precision voltage source across the voltage tap leads

	. verify proper signal levels through data system 


Current Shunts

	. remove BNC cable from shunt
	. using precision voltage source apply +1, and -1 volts
	  to the cable
	. verify proper signal levels through data system


Bus Rogowski Coils

	. install leads across bus Rogowski to stepdown transformer

	. apply 500 to 700 amps through Rogowski at 60 Hz

	. verify proper signal level through data system

	. verify proper signal levels through to Hybrid computer


MOV Rogowski Coils

	. install leads across MOV Rogowski to stepdown transformer

	. apply 500 to 700 amps through Rogowski at 60 Hz

	. verify proper signal level through data system



Commutation Rogowskis

	. verify that leads to Rogowskis are okay

	. if okay then we will check during operation of the commutation
	  supplies

	otherwise:

	. install leads across MOV Rogowski to stepdown transformer

	. apply 500 to 700 amps through Rogowski at 60 Hz

	. verify proper signal level through data system



Ground Fault Fuses

	. verify the TF center tap ground is connected properly

	. verify that all fuses are continuous with an ohmmeter

	. pop each switch and verify that we get a ground fault alarm
	  in the control room

	. verify fault propagates properly around the power room


Ground Fault Current Pearson Transformers

	. use SCR to dump a 5 to 20 amp, 100 uS long pulse through each
	  Pearson Transformer

	. measure current with shunt signal sent to data system

	. verify proper operation of transformers 


Reed Switches

	. use a small magnet to check that all the bus reed switches
	  work properly and sound horn

	. check that MOV reed switches latch relays

Hi-Yard and Alternator signals

	. 13.8kV Va, Vb, Vc 
	. 13.8kV Ia, Ib, Ic

	. Alternator exciter current and voltage
	. Alternator field current and voltage
	. Alternator speed