GE 469

CHAPTER 7: TESTING
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL 7–5
A2 METERING DATA Z CURRENT METERING:
7.2.4 GE Multilin 50:0.025 Ground Accuracy Test
The 469 specification for GE Multilin 50:0.025 ground current input accuracy is ±0.5% of CT
rated primary (25 A). Perform the steps below to verify accuracy.
Z Alter the following settings:
S2 SYSTEM SETUP Z CURRENT SENSING ZV GROUND CT: “50:0.025”
Measured values should be ±0.125 A.
Z Inject the values shown in the table below either as primary values into a
GE Multilin 50:0.025 Core Balance CT or as secondary values that
simulate the core balance CT.
Z Verify accuracy of the measured values.
Z View the measured values in:
A2 METERING DATA Z CURRENT METERING
7.2.5 RTD Accuracy Test
The 469 specification for RTD input accuracy is ±2°. Perform the steps below.
Z Alter the following settings:
S8 RTD TEMPERATURE Z RTD TYPES Z STATOR RTD TYPE: “100 Ohm Platinum” (select
desired type)
S8 RTD TEMPERATURE ZV RTD #1 Z RTD #1 APPLICATION: “Stator” (repeat for RTDs 2 to
12)
Measured values should be ±2°C or ±4°F.
Z Alter the resistances applied to the RTD inputs as per the table below to
simulate RTDs.
Z Verify accuracy of the measured values.
Z View measured values in:
INJECTED
CURRENT
1 A UNIT
EXPECTED
CURRENT
READING
MEASURED
GROUND
CURRENT
MEASURED DIFFERENTIAL
CURRENT
PHASE A PHASE B PHASE C
0.1 A 100 A
0.2 A 200 A
0.5 A 500 A
1.0 A 1000 A
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