GE T60 Instruction Manual page 489
Transformer protection system
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CHAPTER 5: SETTINGS
— This setting specifies an acknowledging input for the three-bit control input. The pre-selected
SELECTOR 1 3BIT ACK
position is applied on the rising edge of the assigned FlexLogic operand. This setting is active only under the
"Acknowledge" mode of operation. The acknowledging signal must appear within the time defined by the
setting after the last activity of the three-bit control inputs. Note that the stepping up control input and three-bit
OUT
control input have independent acknowledging signals (
— This setting specifies the element behavior on power up of the relay.
SELECTOR 1 POWER-UP MODE
When set to "Restore," the last position of the selector (stored in the non-volatile memory) is restored after powering up the
relay. If the position restored from memory is out of range, position 0 (no output operand selected) is applied and an alarm
is set (
SELECTOR 1 PWR ALARM
When set to "Synchronize," the selector switch acts as follows. For two power cycles, the selector applies position 0 to the
switch and activates
SELECTOR 1 PWR ALARM
dictated by the three-bit control input. This operation does not wait for time-out or the acknowledging input. When the
synchronization attempt is unsuccessful (that is, the three-bit input is not available (0,0,0) or out of range), then the selector
switch output is set to position 0 (no output operand selected) and an alarm is established (
The operation of "Synch/Restore" mode is similar to the "Synchronize" mode. The only difference is that after an
unsuccessful synchronization attempt, the switch attempts to restore the position stored in the relay memory. The "Synch/
Restore" mode is useful for applications where the selector switch is employed to change the setting group in redundant
(two relay) protection schemes.
— If enabled, the following events are logged:
SELECTOR 1 EVENTS
Event name
Description
SELECTOR 1 POS Z
Selector 1 changed its position to Z
SELECTOR 1 STP ALARM
The selector position pre-selected via the stepping up control input has not been confirmed before the
time out
SELECTOR 1 BIT ALARM
The selector position pre-selected via the three-bit control input has not been confirmed before the time
out
The following figures illustrate the operation of the selector switch. In these diagrams, "T" represents a time-out setting.
T60 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
SELECTOR 1 ACK
).
. After two power cycles expire, the selector synchronizes to the position
and
, accordingly).
SELECTOR 1 3BIT ACK
SELECTOR 1 PWR ALARM
CONTROL ELEMENTS
SELECTOR TIME-
).
5
5-307
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