5-20
Location Message Line Description
ate Ground Instantaneous Trip Level setpoint.
If a Ground Overcurrent Pickup Level is selected between 5 and 24%, the
range of the ground protection will be from 1 to 8 times pickup. As a result,
the Ground Instantaneous Trip Level setpoint at address 138
HEX
will
appear. With this setpoint, instantaneous trip levels will be selectable from
1 to 7 times pickup in steps of 0.1. The setpoint message will appear as
above.
If a Ground Overcurrent Pickup Level is selected between 25 and 150%,
the range of the ground protection will be from 1 to 20 times pickup. As a
result, the Ground Instantaneous Trip Level setpoint at address 145
HEX
will
appear. With this setpoint, instantaneous trip levels will be selectable from
1 to 18 times pickup in steps of 0.1. The setpoint message will appear as
below. (The preceding discussion addresses the Ground Current
Autoranging feature.)
GND INST TRIP 2
LEVEL 3.0 X P/U
S 3.15
GND INST TRIP
DELAY INST
An intentional delay on the ground instantaneous trip is entered here, in
the range of 0 to 40 cycles, in steps of 1 cycle. This prevents nuisance trips
due to momentary high ground currents. Should the condition persist
beyond the timed period the trip will occur. If 0 is selected, the message will
display INST and there will be no intentional delay on the trip. There is,
however, a 1 cyc delay which is necessary for the 565 relay to react to the
fault condition. If any other value is entered within the above range, the trip
will occur in the above reaction time plus the entered value.
Definite Time characteristics can be implemented by using the ground
instantaneous trip and the appropriate time delays. For example, the
ground instantaneous trip can be enabled and a delay between 0–40
cycles programmed. This effectively will simulate a Definite Time curve.
S 3.16
GND HISET TRIP
RELAY TRIP
This message allows the user to select the relay which the trip signal
generated in message S 3.14, will activate.
Messages S 3.17 to S 3.24 are specific to the 575 only. The remaining messages beginning with S 3.25 are for both the 565/
575.
S 3.17
GND AUTOBLK INST
HISET DISABLED
This setpoint allows the user to enable or disable the ground autoblock
hiset feature.
Message S 3.18 will only appear if ENABLED is selected in message S 3.17.
S 3.18
GND AUTOBLK HISET
AFTER RECL.# 4
The GND HISET TRIP will be blocked after the selected reclosure shot.
(575)
GND HISET INST
DELAY INST
(575)
GND HISET INST
RELAY TRIP&AUX1
SETPOINTS MODE - GROUND CURRENT
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