Date Code 20010731
Close Logic
4-3
SEL-352-1, -2 Instruction Manual
Synchronism Checking
Figure 4.4 shows the synchronism controlled close logic used in the SEL-352 Relay. Outputs
25C and 25M are used by the synchronism controlled close logic shown in Figure 4.5 and are
available in the Relay Word. Note that the angle calculation is based on the slip frequency and
the nominal closing time of the breaker, Tclose. The VnX and VnY voltages and X59Hn,
X59Ln, and Y59Ln elements appear with the “n” in Figure 4.4. The SYNCP setting programs n
as phase A, B, or C.
Angle
Calculation
(Tclose, Slip)
10.5
0
Frequency
Calculation
+
_
+
_
+
_
+
_
4.5
4.5
0
0
25AC
25AM
enable
SEN
(CYCLES)
X59Hn
X59Ln
Y59Ln
enable
(CYCLES)
(CYCLES)
SS
SS
25C
25M
25T
25SC
25SM
M3520008
52AA
52AB
52AC
VnX
VnY
Figure 4.4: Synchronism Logic
Synchronism check output SCTD is combined with the point-on-wave outputs CTA, CTB, and
CTC on a per-phase basis to form outputs CCA, CCB, and CCC, respectively. Figure 4.9
illustrates this combination for the A-phase logic. Note that RCLS (reset close) resets the close
timers if any of the TRIPn inputs assert.
If you are trying to use the synchronism check logic for reclosing, there are at least two methods
of using it without the point-on-wave logic. One method is to set CLSLOG=2, CLSA = CLSB =
CLSC = any unused output, and PCApu = PCBpu = PCCpu = ZCApu = ZCBpu = ZCCpu = 0.
Finally, set OUT301 = OUT302 = OUT303 = 0 and use SCTD in an output SEL
OGIC
®
control
equation. A second method is to set CLSLOG=CUSTOM, ZCNA = ZCNB = ZCNC = ZCPA =
ZCPB = ZCPC = PCNA = PCNB = PCNC = PCPA = PCPB = PCPC = 0, and only change the
settings normally associated with Scheme 2.
Содержание SEL-352-1
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