4.166
SEL-700G Relay
Instruction Manual
Date Code 20170814
Protection and Logic Functions
Group Settings (SET Command)
Figure 4.113
Synchronism-Check Elements
The synchronism-check elements are explained in detail in the following text.
q
From Figure 4.112
Angle
Difference
Calculator
Angle
Difference
Calculator
Slip Frequency Element
Maximum Angle 1
Maximum Angle 2
Maximum Angle 1
Breaker Close Time
Maximum Angle 2
Slip Frequency Element
SFY
VPY
VPY
VS
VS
Relay
Word
Bits
SFY
Slip
Frequency
0°
Relay
Word
Bits
25AY1
25AY2
25AY1
25AY2
Relay
Word
Bits
Angle
Difference
Angle
Difference
(absolute value)
(absolute value–
compensated by
setting TCLOSDY)
Synchronism-Check Element 1
Synchronism-Check Element 2
Synchronize at
Angle Difference = 0°
Operation of Synchronism-Check Elements if voltages VP
and VS are
static
(not slipping):
slip frequency < or equal to 0.005 Hz or:
Setting TCLOSDY = OFF
Operation of Synchronism-Check Elements if voltages VP and
VS are
slipping
:
0.005 Hz < slip frequency < or equal to
setting 25 SF and:
Setting TCLOSDY = numeric value
25ANG1Y
25ANG2Y
Settings
TCLOSDY
25ANG1Y
25ANG2Y
Compensated Angle
Difference Increasing
Settings
Synchronism-
Check
Element 1
Synchronism-
Check
Element 2
1
1
1
Summary of Contents for SEL-700G Series
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