4.157
Date Code 20170814
Instruction Manual
SEL-700G Relay
Protection and Logic Functions
Group Settings (SET Command)
The 25ANG1X setting defines an acceptable generator breaker closing angle.
The relay asserts the 25AX1 Relay Word bit when the generator voltage is
within 25ANG1X degrees of the system voltage if the other supervisory
conditions also are met. When the breaker close time setting, TCLOSDX, is
nonzero, the relay accounts for the breaker time and present slip frequency to
adjust the phase angles where 25AX1 is asserted.
The 25ANG2X setting also defines an acceptable generator breaker closing
angle. The relay asserts the 25AX2 Relay Word bit when the generator voltage
is within 25ANG2X degrees of the system voltage if the other supervisory
conditions also are met. The relay does not account for the breaker time or
present slip frequency to adjust the phase angles where 25AX2 is asserted; it
is an absolute phase angle comparison.
The CANGLE setting defines a target closing angle (positive angle indicates
VS lagging SYNCP voltage). When the balance of the supervisory conditions
are satisfied (slip, voltage window, voltage difference) the synchronism-check
function accounts for the present slip and the set TCLOSDX time (if not equal
to zero). The relay asserts the 25C Relay Word bit to initiate a close when the
angle difference equals the CANGLE setting. 25C assertion is timed so that, if
the slip remains constant and the breaker closes in TCLOSDX ms, the breaker
main contacts close the instant the angle different is equal to CANGLE. See
Figure 4.108, Figure 4.109, Figure 4.110, and Figure 4.111 for additional
detail.
Figure 4.108
Synchronism-Check Function Slip Elements
q
0
3.0
CYC
VENX
SLIP Hz
GENFLO
SFX
GENFHI
25SHI
25SLO
FREQS
FREQX
VDIFX
25VDIFX = OFF
59VPX
59VSX
BSYNCHX
ZCFREQX
FREQTRKX
SLIP = FREQX - FREQS
Generator Frequency
Busbar Frequency
Relay
Word
Bits
Setting
Setting
Setting
1
Содержание SEL-700G Series
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