Schweitzer Engineering Laboratories SEL-311C - Figure 3.17 Out-Of-Step Zone Detection Logic

3.24
SEL-311C Relay Instruction Manual Date Code 20060320
Distance, Out-of-Step, Overcurrent, Voltage, Synchronism Check, and Frequency Elements
Out-of-Step Characteristics
q From Figure 5.3; w from Figure 4.1.
Figure 3.17 Out-of-Step Zone Detection Logic
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
Table 3.7 OOS Relay Word Bits (Sheet 2 of 2)
Relay
Word Bits
Description
Relay
Word Bits
Description
|I1|
50ABCP
(Setting)
_
+
UBOSBD
0
UBOSB
X5ABC
X6ABC
50ABC
Z1 =
V1
I1
Im (Z1)
Re (Z1)
V1
I1
q 3PO
w ILOP
X
R
Zone 6
X
R
Zone 5
X
R
3f
Unblock
(Internal Function)
Relay
Word
Bits
Relay
Word
Bits