GE Multilin 565 Instruction Manual Download

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5-19

Location

Message Line

Description

Message S 3.7 will not appear if CUSTOM CURVE is selected in message S 3.6.

S 3.7

GROUND O/C TIME
DIAL 1

The ground overcurrent time dial number is entered here. This allows the
user to select a curve to match the system requirements. Refer to the “Use
of standard curves” in section 3 to determine the correct curve and select
it by entering its number here. Any number between 1 and 32 may be
entered.

S 3.8

GROUND O/C RELAY
TRIP

This message allows the user to select the relay which the ground
overcurrent trip will activate.

S 3.9

GROUND O/C ALARM
DISABLED

This message asks if you want the ground overcurrent alarm ENABLED or
DISABLED.

Messages S 3.10 to 3.12 will only appear if ENABLED is selected in message S 3.9.

S 3.10

GND O/C ALARM
LEVEL 1.5 X P/U

The ground overcurrent alarm level is entered here as a multiple of the
pickup level. The range of values allowed is 0.5 to 3 in steps of 0.1. This
setpoint sets the level of ground current at which the 565 Relay initiates an
alarm. A level of 1 times pickup can be programmed. The LCD will then
indicate when the Relay is operating above pickup.

For example, if 0.5 is entered here, then the 565 Relay will initiate an alarm
when the ground current reaches 50% of the pickup level entered in
message S 3.5. Determine the alarm level for your application by referring
to the feeder design specifications. The alarm must be far enough below
the trip setting to allow corrective action to be taken.

S 3.11

GND O/C ALARM
DELAY 1 SEC

The time delay for the ground alarm is entered here. This feature prevents
the alarm for the timed period and stops nuisance alarms due to momen-
tary high ground currents. Should the alarm condition persist beyond the
timed period the alarm will occur. The range for this setpoint is 1 to 255
seconds in steps of 1 second.

S 3.12

GND O/C ALARM
RELAY AUX1

This message allows the user to select the relay which the alarm signal
generated in message S 3.10 will activate.

S 3.13

GROUND INST
TRIPS ENABLED

This message asks if you want the ground instantaneous trip ENABLED or
DISABLED.

NOTE: This setpoint must be enabled and a proper trip level must be

selected if a pickup level has been selected greater than 100% of
CT (5A tap only). See caution in section "Protection Application
Information."

Messages S 3.14 to 3.16 will only appear if ENABLED is selected in message S 3.13.

S 3.14

GND HISET TRIP
LEVEL 3.0 X P/U

The instantaneous ground current trip level is entered here as a multiple of
the pickup level already chosen in message S 3.5. This feature protects the
feeder from sudden very high ground current. For example, say the ground
pickup level is 50 amps, and a setting of 2 was chosen here. If a ground
current of 100 or more amps lasts for longer than the time delay set in
message S 3.15, then a trip signal will be produced by the 565 Relay. The
range of the ground current protection will be set by the value of the ground
overcurrent pickup level. In addition, the pickup level selects the appropri-