4.167
Date Code 20170814
Instruction Manual
SEL-700G Relay
Protection and Logic Functions
Group Settings (SET Command)
Voltage Input VS Connected Phase-to-Phase or Beyond Delta-Wye
Transformer
Sometimes synchronism-check voltage
VS
cannot be in phase with voltage
VA, VB, or VC (wye-connected PTs); or VAB, VBC, or VCA (delta-
connected PTs). This happens in applications where voltage input
VS
is
connected
➤
Phase-to-phase when using a wye-connected relay
➤
Phase-to-neutral when using a delta-connected relay
➤
Beyond a delta-wye transformer
For such applications requiring VS to be at a constant phase angle difference
from any of the possible synchronizing voltages (VA, VB, or VC; VAB, VBC,
or VCA), an angle setting is made with the SYNCPY setting (see Table 4.48
and Setting SYNCPY).
Setting SYNCPY
Enable the two single-phase synchronism-check elements by setting
E25Y := Y.
Wye-Connected Voltages.
The angle setting choices (0, 30, …, 300, or 330
degrees) for setting SYNCPY are referenced to VAY, and they indicate how
many degrees VS constantly lags VAY. In this case, voltage input
VAY-N
has to
be connected and has to meet the “healthy voltage” criteria (settings 25VHIY
and 25VLOY—see Figure 4.112). For situations where VS cannot be in phase
with VAY, VBY, or VCY, the angle setting choices (0, 30, …, 300, or 330
degrees) are referenced to VAY.
Delta-Connected Voltages.
The angle setting choices (0, 30, …, 300, or
330 degrees) for setting SYNCPY are referenced to VABY, and they indicate
Table 4.48
Synchronism-Check Settings
Setting Prompt
Setting Range
Setting Name :=
Factory Default
SYNC CHECK EN
Y, N
E25Y := N
V-WINDOW LOW
0.00–300.00 V
25VLOY := 58.30
V-WINDOW HIGH
0.00–300.00 V
25VHIY := 69.70
MAX VOLTAGE DIFF
OFF, 1.0–15 %
25VDIFY := 3.3
VOLT RATIO CORR
0.5000–2.000
25RCFY := 1.000
MAX SLIP FREQ
0.05–0.50 Hz
25SF := 0.20
MAX ANGLE 1
0–80 deg
25ANG1Y := 25
MAX ANGLE 2
0–80 deg
25ANG2Y := 40
SYNC PHASE
VAY, VBY, VCY, or 0, 30, 60,
90, 120, 150, 180, 210, 240,
270, 300, 330 deg lag VAY
a
a
Range shown for DELTAY_Y := WYE.
SYNCPY := VAY
SYNC PHASE
VABY, VBCY, VCAY, or 0, 30,
60, 90, 120, 150, 180, 210, 240,
270, 300, 330 deg lag VABY
b
b
Range shown for DELTAY_Y := DELTA.
SYNCPY := VABY
BRKR CLOSE TIME
OFF, 1–1000 ms
TCLOSDY := 50
BLK SYNCH CHECK
SV
BSYNCHY := NOT 3POY
NOTE:
Settings SYNCPY := 0 and
SYNCPY := VAY are effectively the
same (voltage VS is directly
synchronism checked with voltage
VAY; VS does not lag VAY). The relay
displays the setting entered
(SYNCPY := VAY or SYNCPY := 0).
Summary of Contents for SEL-700G Series
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