CHAPTER 7: COMMISSIONING METERING
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 7–15
7.4.7 Tap Position
The analog input used to sense tap position is programmed with the S2 SYSTEM SETUP
ONLOAD TAP CHANGER
setpoints.
To verify the operation of this circuit, connect a variable resistor across
terminals A3 and A4.
The resistor range should cover the full range of resistance produced by
the tap changer mechanism. The tap position is displayed in A2
METERING
TAP CHANGER TAP CHANGER POSITION.
Adjust the resistance to simulate the minimum tap position and verify
that a “1” is displayed.
Gradually increase the resistance up to the value which represents the
maximum tap value, verifying that the tap position indicator tracks the
resistance.
Table 7–2: Analog Output Calibration Results
Analog output number: __________ Analog output minimum: ______________
Analog output value: ___________ Analog output maximum: ___________
Analog output range: ____________
Input signal amplitude
(% of full range)
Expected mA output Measured mA output
0
25
50
75
100
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