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• Capability to disable Reclosing and Synchronism function from front panel setting.
1. 3.
Optional Features for Reclosing Option
• Selectable voltage check and synchronism check
Hot Line Dead Bus (HLDB) or Hot Bus Dead Line (HBDL) voltage supervision selection for
each reclosure and Manual Close.
Selectable live and dead voltage levels,
Synchronism angle and synchronism time
Wait time:
0 - 990 seconds or infinite.
Synchronism condition time:
0.01 - 20 seconds.
Switched synchronism settings allow HLDB,HBDL and /or SYNC within any reclose se-
quence and Manual Close.
• 120 Volt phase to phase synchronism source input
1.4
RECLOSE/SYNCHRONISM CHECK
SOFTWARE
The reclose/synchronism check software includes the following functions:
a. All the reclose and synchronism check functions.
b. All the MMI functions.
c. Selectable output function.
d. Reclosing event recording.
e. Test functions
1.5
SELF-CHECKING SOFTWARE
Self-checking software includes the following functions:
a. Program Memory Check Sum
Immediately upon power-up, the relay does a complete EPROM checksum of program
memory. Afterwards, the Reclosing Relay continually verifies the program memory check-
sum.
b. Power Up RAM Check:
Immediately upon power-up, the relay does a complete test of the RAM data memory.
c. EEPROM Check:
Settings are stored in EEPROM in three identical arrays. These arrays are continuously
checked by the program. If any of the three array entrees disagree, a EEPROM failure is
detected.
1. 6.
Unique Remote Communications Program(RCP)
Special remote communications software, RCP is provided for obtaining fault, metering and cur-
rent settings data as well as sending data to the REL301/302. RCP can best be described as a
user friendly way of using a personal computer (PC) to communicate with ABB protective relays
by way of pull-downs menus. By coupling a computer with the appropriate communications
1
I.L. 40-386.12
1-3
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