Schweitzer Engineering Laboratories SEL-700G Series, Инструкция по эксплуатации

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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).