GE Multilin
745 Transformer Management Relay
8-11
8 COMMISSIONING
8.4 DISPLAY, METERING, COMMUNICATIONS, AND ANALOG OUTPUTS
8
8.4.6 ANALOG OUTPUTS
1.
The analog output settings are located in the
S2 SYSTEM SETUP
ÖØ
ANALOG OUTPUTS
setpoints section.
2.
Connect a milliammeter to the Analog Output contacts: COM on A5 and Analog Output 1 on A6, Analog Output 2 on
A7, Analog Output 3 on A8, Analog Output 4 on A9, Analog Output 5 on A10, Analog Output 6 on A11, or Analog Out-
put 7 on A12.
3.
From the settings used for the tested Analog output, determine the mA range for the output and the driving signal and
its range for the full range of output current.
4.
Apply the input signal and vary its amplitude over the full range and ensure the Analog Output current is the correct
amplitude. Record the results in the table below. Duplicate as required for each Analog Output.
8.4.7 TAP POSITION
1.
The Analog Input used to sense tap position is programmed with the
S2 SYSTEM SETUP
ÖØ
ONLOAD TAP CHANGER
set-
points.
2.
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 METER-
ING
ÖØ
TAP CHANGER
Ö
TAP CHANGER POSITION
.
3.
Adjust the resistance to simulate the minimum tap position and verify that a "1" is displayed. Now gradually increase
the resistance up to the value which represents the maximum tap value, verifying that the tap position indicator tracks
the resistance.
Table 8–2: ANALOG OUTPUT CALIBRATION RESULTS
ANALOG OUTPUT NUMBER:
______________
ANALOG OUTPUT MIN.:
________________
ANALOG OUTPUT VALUE:
______________
ANALOG OUTPUT MAX.:
________________
ANALOG OUTPUT RANGE:
______________
INPUT SIGNAL AMPLITUDE
(% OF FULL RANGE)
EXPECTED MA OUTPUT
MEASURED MA OUTPUT
0
25
50
75
100
