3.55
Date Code 20060320
Instruction Manual
SEL-311C Relay
Distance, Out-of-Step, Overcurrent, Voltage, Synchronism Check, and Frequency Elements
Frequency Elements
Frequency Elements
Six frequency elements are available. The desired number of frequency
elements are enabled with the E81 enable setting:
E81 =
N
(none), 1 through 6
as shown in
. Frequency is determined from the voltage connected
to voltage terminals
VA–N
,
VS
, and positive-sequence current.
Frequency Element
Settings
q
.
Figure 3.33
Undervoltage Block for Frequency Elements
0
30
CYC
27B81P
Setting
V
a
V
b
V
c
Voltages
Wye/Delta
to Frequency Element
Logic (
q
)
27B81
Relay
Word
Bit
Summary of Contents for SEL-311C
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