Basler Electric BE1-51/27R - Manual (Page 63)

9137200999 Rev F 57
Setting Example
Error! Reference source not found. illustrates generator relay elements that are to be set in this
example. Plant 11 kV feeders are supplied by a 115 kV system that is supplemented by two local 3,700
kVA generators. Line 1 is illustrated completely; line 2 is the same as line 1 and only shows major
components. Settings are provided for the BE1-51/27R Time Overcurrent Relay with voltage restraint,
BE1-51 Time Overcurrent Relay, and BE1-67 Phase Directional Overcurrent Relay.
Generator Backup (Breaker A)
•
BE1-51/27R (51/27), relay style number: U3E B6S B2C0F
•
Three-phase-and-neutral overcurrent
•
1.5 to 12 A phase (instantaneous trip is out of service)
•
0.5 to 4 A neutral (instantaneous is in service)
•
Very inverse timing (B6)
•
300/5 CTs
Feeder (Breaker F)
•
BE1-51 (51)
•
0.5 to 12 A
•
Very inverse timing (B6)
•
800/5 CTs
•
No instantaneous
•
Pickup set to 6 A
•
Time Dial set to 08
Phase Directional (Breaker L)
•
BE1-67 (67)
•
0.5 to 12 A
•
Definite timing (B3)
•
3,000/5 CTs
•
Pickup set to 0.5 A
•
Time Dial set to 02
Generator Reactance (Per Unit)
Sub transient ........... 0.18
Transient ................. 0.25
Steady State ........... 1.5
BE1-51/27R Tests and Adjustments