Schweitzer Engineering Laboratories SEL-300G - Page 48

2-8 Relay Element Settings
Date Code 20020206 SEL-300G Instruction Manual
DWG: M300G041
Generator
Grounding
Transformer
a:1
IN
VN
CTRN = CT Ratio to 1
PTRN = a
SEL-300G Relay
(partial)
Generator
Grounding
Transformer
a:1
IN
VN
CTRN = CT Ratio to 1
PTRN = 2 • a
SEL-300G Relay
(partial)
2:1
Optional
Auxiliary
Transformer
Figure 2.3: PTRN, CTRN Setting Examples
Enable Volts/Hertz Protection (Y, N) E24 = Y
Enable Synchronism Checking Function (Y, N) E25 = Y
(0300G2 &
0300G3)
Enable Undervoltage (U/V) Protection (Y, N) E27 = Y
Enable Reverse/Low-Forward Power Protection (Y, N) E32 = Y
Enable Loss-of-Field Protection (Y, N) E40 = Y
Enable Neg-Seq Overcurrent (O/C) Protection (Y, N) E46 = Y
Enable O/C Protection (Y, N) E50 = N
Enable 87-Input O/C Protection (Y, N) E50_87 = N
(0300G1 &
0300G3)
Enable Time-O/C Protection (Y, N) E51 = Y
Enable Backup Protection (N, D, V, C) EBUP = D