GE Masoneilan 469 Series, Instruction Manual

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7–14 469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 7: TESTING
 Alter the following settings:
S2 SYSTEM SETUP

VOLTAGE SENSING

VT CONNECTION TYPE:
“Wye” or “Delta”
S2 SYSTEM SETUP

POWER SYSTEM

SYSTEM PHASE SEQUENCE:
“ABC”
S9 VOLTAGE ELEMENTS

PHASE REVERSAL

PHASE REVERSAL TRIP:
“Latched”
S9 VOLTAGE ELEMENTS

PHASE REVERSAL

ASSIGN TRIP RELAYS:
“Trip”
 Apply voltages as per the table below.
 Verify the 469 operation on voltage phase reversal.
7.3.5 Short Circuit Test
The 469 specification for short circuit timing is +50 ms. The pickup accuracy is as per the
phase current inputs. Perform the steps below to verify the performance of the short circuit
element.

Alter the following settings:
S2 SYSTEM SETUP

CURRENT SENSING

PHASE CT PRIMARY:
“1000”
S6 CURRENT ELEMENTS

SHORT CIRCUIT TRIP

SHORT CIRCUIT TRIP:
“On”
S6 CURRENT ELEMENTS

SHORT CIRCUIT TRIP

ASSIGN TRIP RELAYS:
“Trip”
S6 CURRENT ELEMENTS

SHORT CIRCUIT TRIP

SHORT CIRCUIT TRIP PICKUP:
“5.0
×
CT”
S6 CURRENT ELEMENTS

SHORT CIRCUIT TRIP

INTENTIONAL S/C DELAY:
“0”

Inject current as per the table below, resetting the unit after each trip
by pressing the
RESET
key, and verify timing accuracy.
 Pre-trip values may be viewed by pressing
NEXT
after each trip.
APPLIED VOLTAGE EXPECTED RESULT
8
NO TRIP
4
PHASE REVERSAL
TRIP
OBSERVED RESULT
8
NO TRIP
4
PHASE REVERSAL
TRIP
Va = 120 V ∠ 0 °
Vb = 120 V ∠ 120 °
Vc = 120 V ∠ 240 °
8
Va = 120 V ∠ 0 °
Vb = 120 V ∠ 240 °
Vc = 120 V ∠ 120 °
4
INJECTED CURRENT EXPECTED TIME
TO TRIP
MEASURED TIME
TO TRIP
5 A UNIT 1 A UNIT
30 A 6 A < 50 ms
40 A 8 A < 50 ms
50 A 10 A < 50 ms