F-2 Special Application Settings Date Code 20011026
SEL-321/321-1 Instruction Manual
VALUE OF FACTORY SETTINGS LPVNOM AND FQVPU
Factory settings are not normally adjusted by the user and are not all described in the instruction
manual. Access factory settings at security level CAL (the password is CLARKE) with the
SET F command.
Setting LPVNOM adjusts the magnitude of positive-sequence voltage required to reset loss-of-
potential (LOP) upon the restoration of voltage. The default setting of 57 volts will provide
correct operation for systems down to a nominal secondary voltage of 100 V line-to-line.
Setting FQVPU sets the magnitude of A-phase voltage at which the relay enables frequency
tracking. Certain system configurations, such as series compensated lines, may require a higher
value than the default settings of 10 volts. To prevent frequency tracking errors during a fault,
this setting should not be changed without system studies.
To Next Page
Loading...
