4.154
SEL-700G Relay
Instruction Manual
Date Code 20170814
Protection and Logic Functions
Group Settings (SET Command)
Set E25X := Y to enable synchronism-check elements. When E25X := N, the
59VPX, 59VSX, GENVHI, GENVLO, GENFHI, GENFLO, VDIFX, 25AX1,
25AX2, 25C, CFA, and BKRCF Relay Word bits are inactive and both
synchronism-check and autosynchronizing functions are disabled.
Set SYNCPX to select a phase voltage input (generator terminals) that is in
phase with the synchronizing voltage (VS). The VS can be derived from
phase-to-ground or phase-to-phase connected VT, regardless of whether open-
delta or four-wire wye VTs are used on the generator.
For the applications requiring VS to be at a constant phase angle difference
from any of the possible phase voltages (VAX, VBX, VCX; or VABX, VBCX,
VCAX depending on DELTAY_X := WYE or DELTA), set the SYNCPX to
an angle by which VS lags VAX or VABX.
The 25VLOX and 25VHIX settings define the acceptable system (VS) voltage
magnitude window prior to closing the generator breaker. 25VHIX must be a
higher voltage value than 25VLOX. The system and generator voltages must
both be greater than 25VLOX and less than 25VHIX for the synchronism-
check outputs to operate. The 25VDIFX setting defines the maximum
acceptable percentage magnitude difference between the system and generator
voltages prior to closing the generator breaker. See Figure 4.105 and
Figure 4.106 for more detail.
MAX SLIP FREQ
–0.99 to 1.00 Hz
25SHI := 0.10
MAX ANGLE 1
0–80 deg
25ANG1X := 5
MAX ANGLE 2
0–80 deg
25ANG2X := 15
TARGET CLOSE ANG
–15 to 15 deg
CANGLE := -3
SYNC PHASE
VAX, VBX, VCX, 0,
30, 60, …, 330 deg
SYNCPX := VAX
a
SYNC PHASE
VABX, VBCX,
VCAX, 0, 30, 60, …,
330 deg
SYNCPX := VABX
b
BRKR CLOSE TIME
OFF, 1–1000 ms
TCLOSDX := 150
CLOSE FAIL ANGLE
OFF, 3–120 deg
CFANGLE := 30
BLK SYNC CHECK
SEL
OGIC
BSYNCHX := NOT 3POX
a
Setting range and default values shown are for DELTAY_X := WYE.
b
Setting range and default values shown are for DELTAY_X := DELTA.
Table 4.47
X-Side Synchronism-Check Settings
(Sheet 2 of 2)
Setting Prompt
Setting Range
Setting Name := Factory Default
Summary of Contents for SEL-700G Series
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