3-50
Line Current Differential, Distance, Out-of-Step, Overcurrent,
Date Code 20011112
Voltage, Synchronism Check, and Frequency Elements
SEL-311L Instruction Manual
Table 3.5: OOS Relay Word Bits
Relay Word
Bits
Description
Relay Word
Bits
Description
50ABC Positive-sequence
current
above threshold
OSTO
Outgoing out-of-step trip
X6ABC
Impedance inside Zone 6
OST
Out-of-step trip
X5ABC
Impedance inside Zone 5
OSB1
Block Zone 1 during an
out-of-step condition
UBOSB
Unblock out-of-step blocking
OSB2
Block Zone 2 during an
out-of-step condition
OSB
Out-of-step block
OSB3
Block Zone 3 during an
out-of-step condition
OSTI
Incoming out-of-step trip
OSB4
Block Zone 4 during an
out-of-step condition
|I1|
50ABCP
(Setting)
_
+
M311L127
UBOSBD
0
UBOSB
X5ABC
X6ABC
50ABC
Z1 =
V1
I1
Im (Z1)
Re (Z1)
V1
I1
From Figure 5.5 3PO
From Figure 4.1 ILOP
X
R
Zone 6
X
R
Zone 5
X
R
3f
Unblock
(Internal Function)
Relay
Word
Bits
Relay
Word
Bits
Figure 3.40: Out-of-Step Zone Detection Logic
Summary of Contents for SEL-311L
Page 6: ......
Page 8: ......
Page 26: ......
Page 54: ......
Page 144: ......
Page 216: ......
Page 252: ......
Page 302: ......
Page 338: ......
Page 480: ......
Page 484: ......
Page 486: ......
Page 502: ......
Page 532: ...12 28 Standard Event Reports and SER Date Code 20010625 SEL 311L Instruction Manual 4 ...
Page 552: ......
Page 554: ......
Page 574: ......
Page 576: ......
Page 596: ......
Page 602: ......
Page 628: ......
Page 656: ......
Page 662: ......
Page 664: ......
Page 688: ......
Page 700: ......
Page 716: ......
Page 722: ......
Page 734: ......