4.156
SEL-700G Relay
Instruction Manual
Date Code 20170814
Protection and Logic Functions
Group Settings (SET Command)
applications require 25RCFX := 1.000, but some applications may need a
different setting. Figure 4.107 shows four out of several possible
configurations and their associated settings and calculations.
Figure 4.107
Synchronism-Check Function 25RCFX and SYNCPX/SYNCPY Setting Examples
The 25SLO and 25SHI settings define the acceptable slip frequency between
the system and the generator prior to closing the generator breaker. 25SHI
must be greater than 25SLO. The SEL-700G defines slip frequency greater
than 0 Hz when the generator frequency is greater than the system frequency.
SEL-700G
PTRX = 115
PTRS = 115
VSNOM = 13800 / 115
VPNOMX = 13800 / 115
RCFX = VSNOM / VPNOMX = 1.000
DELTAY_X = DELTA
SYNCPX = VABX
52X
A to B
PTRS
PTRX
Generator
13.8 kV
SEL-700G
PTRX = 115
PTRS = 1000
VSNOM = (115000 / 1.732) / 1000
VPNOMX = (13800 / 1.732) / 115
RCFX = VSNOM / VPNOMX = 0.958
DELTAY_X = WYE
SYNCPX = 30 DEG
52X
A to Gnd
PTRS
PTRX
Generator
115 kV
13.8 kV
a
b
c
A
B
C
PTRS = 115
PTRY = 115
VSNOM = 13800 / 115
VPNOMY = 13800 / 115
RCFY = VSNOM / VPNOMY = 1.000
DELTAY_Y = DELTA
SYNCPY = VBCY
Utility
Tie
52Y
PTRY
B to C
PTRS
13.8 kV
Generator
PTRX = 115
PTRS = 115
PTRY = 115
VSNOM = (13800 / 1.732) / 115
VPNOMX = 13800 / 115
VPNOMY = (13800 / 1.732) / 115
RCFX = VSNOM / VPNOMX; = 0.577
RCFY = VSNOM / VPNOMY = 1.00
DELTAY_X = DELTA
DELTAY_Y = WYE
SYNCPX = 270 DEG
SYNCPY = VCY
52X
52Y
PTRY
Utility
Tie
C to Gnd
PTRS
PTRX
Generator
13.8 kV
(a) SEL-700G Without GSU Transformer
(b) SEL-700G With GSU Transformer
(d) SEL-700GT With Generator Protection
(c) SEL-700GT Without Generator Protection
Summary of Contents for SEL-700G Series
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