GE Masoneilan 469 Series, Instruction Manual

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CHAPTER 7: TESTING
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL 7–5
A2 METERING DATA

CURRENT METERING
:
7.2.4 GE Digital Energy 50:0.025 Ground Accuracy Test
The 469 specification for GE Grid Solutions 50:0.025 ground current input accuracy is
± 0.5% of CT rated primary (25 A). Perform the steps below to verify accuracy.

Alter the following settings:
S2 SYSTEM SETUP

CURRENT SENSING

GROUND CT:
“50:0.025”
Measured values should be ± 0.125 A.

Inject the values shown in the table below either as primary values
into a GE Grid Solutions 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.
 Alter the following settings:
S8 RTD TEMPERATURE

RTD TYPES

STATOR RTD TYPE:
“100 Ohm Platinum” (select
desired type)
S8 RTD TEMPERATURE

RTD #1

RTD #1 APPLICATION:
“Stator” (repeat for RTDs 2 to
12)
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.
 Verify accuracy of the measured values.
 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