Additional Functional Testing; Overload Curve Test; Power Measurement Test - GE 469 Instruction Manual

CHAPTER 7: TESTING
7.3

Additional Functional Testing

7.3.1

Overload Curve Test

7.3.2

Power Measurement Test

469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL
The 469 specification for overload curve timing accuracy is ±100 ms or ±2% of time to trip.
Pickup accuracy is as per the current inputs (±0.5% of 2 × CT when the injected current is
less than 2 × CT and ±1% of 20 × CT when the injected current is ≥ 2 × CT). Perform the
steps below to verify accuracy.
Alter the following settings:
S2 SYSTEM SETUP CURRENT SENSING
S2 SYSTEM SETUP CURRENT SENSING
S5 THERMAL MODEL
S5 THERMAL MODEL
S5 THERMAL MODEL
S5 THERMAL MODEL
S5 THERMAL MODEL
S5 THERMAL MODEL
Any trip must be reset prior to each test.
Short the emergency restart terminals momentarily immediately prior to
each overload curve test to ensure that the thermal capacity used is zero.
Failure to do so will result in shorter trip times.
Inject the current of the proper amplitude to obtain the values as shown.
Verify the trip times.
Motor load may be viewed in:
A2 METERING DATA
Thermal capacity used and estimated time to trip may be viewed in
A1 STATUS
AVERAGE PICKUP
PHASE LEVEL
CURRENT
DISPLAYED
1050 A 1.05
1200 A 1.20
1750 A 1.75
3000 A 3.00
6000 A 6.00
10000 A 10.00
The specification for reactive and apparent power is ±1% of
scale at I < 2 × CT. Perform the steps below to verify accuracy.
avg
Alter the following settings:
PHASE CT PRIMARY:
MOTOR FULL LOAD AMPS FLA:
THERMAL MODEL SELECT CURVE STYLE:
THERMAL MODEL OVERLOAD PICKUP LEVEL:
THERMAL MODEL UNBALANCE BIAS K FACTOR:
THERMAL MODEL HOT/COLD SAFE STALL RATIO:
THERMAL MODEL ENABLE RTD BIASING:
O/L CURVE SETUP STANDARD OVERLOAD CURVE NUMBER:
CURRENT METERING
.
MOTOR STATUS
EXPECTED
TIME TO
TRIP
never n/a
795.44 sec. 779.53 to 811.35 sec.
169.66 sec. 166.27 to 173.05 sec.
43.73 sec. 42.86 to 44.60 sec.
9.99 sec. 9.79 to 10.19 sec.
5.55 sec. 5.44 to 5.66 sec.
"1000"
"1000"
"Standard"
"1.10"
"0"
"1.00"
"No"
.
TOLERANCE MEASURED
RANGE TIME TO
TRIP
3 ×2 × CT × VT × VT full
"4"
7–11