7-4
469 Motor Management Relay
GE Power Management
7.2 HARDWARE FUNCTIONAL TESTING
7 TESTING
7
7.2.4 GE POWER MANAGEMENT 50:0.025 GROUND ACCURACY TEST
The 469 specification for GE Power Management 50:0.025 ground current input accuracy is
±
0.5% of CT rated
primary (25 A). Perform the steps below to verify accuracy.
1.
Alter the following setpoint:
S2 SYSTEM SETUP\CURRENT SENSING\GROUND CT:
50:0.025
2.
Measured values should be
±
0.125 A. Inject the values shown in the table below either as primary values
into a GE Power Management 50:0.025 Core Balance CT or as secondary values that simulate the core
balance CT. Verify accuracy of the measured values. View the measured values in:
A2 METERING DATA\CURRENT METERING
7.2.5 RTD ACCURACY TEST
The 469 specification for RTD input accuracy is
±
2
°
. Perform the steps below to verify accuracy.
1.
Alter the following setpoints:
S8 RTD TEMPERATURE\RTD TYPE\STATOR RTD TYPE:
100 ohm Platinum (select desired type)
S8 RTD TEMPERATURE\RTD #1\RTD #1 APPLICATION:
Stator (repeat for RTDs 2 to 12)
2.
Measured values should be
±
2
°
C or ±4°F. Alter the resistances applied to the RTD inputs as per the table
below to simulate RTDs and verify accuracy of the measured values. View the measured values in:
A2 METERING DATA\TEMPERATURE
Table 7–5: 50:0.025 CT GROUND CURRENT TEST
PRIMARY
INJECTED
CURRENT
SECONDARY
INJECTED
CURRENT
EXPECTED
CURRENT
READING
MEASURED
GROUND
CURRENT
0.25 A
0.125 mA
0.25 A
1 A
0.5 mA
1.00 A
10 A
5 mA
10.00 A
25 A
12.5 mA
25.00 A
Table 7–6: 100
Ω
PLATINUM TEST
APPLIED
RESISTANCE
100
Ω
PLATINUM
EXPECTED RTD
TEMPERATURE READING
MEASURED RTD TEMPERATURE
SELECT ONE: ____(
°
C ) ____(
°
F )
° CELSIUS
° FAHRENHEIT
1
2
3
4
5
6
7
8
9
10
11
12
80.31
Ω
–50°C
–58°F
100.00
Ω
0°C
32°F
119.39
Ω
50°C
122°F
138.50
Ω
100°C
212°F
157.32
Ω
150°C
302°F
175.84
Ω
200°C
392°F
194.08
Ω
250°C
482°F