CHAPTER 5: SETTINGS CONTROL ELEMENTS
D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 5-265
5
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.
SELECTOR 1 EVENTS — If enabled, the following events are logged:
The following figures illustrate the operation of the selector switch. In these diagrams, “T” represents a time-out setting.
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
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