Circuit-breaker Maintenance (Breaker)
Parameters 260 to 267 are assigned to CB maintenance. The parameters and the different procedures are
explained in the setting notes of this function (see Section 2.23.2 Statistics).
Pickup Thresholds of the Binary Inputs (Thresholds BI)
At address 220 Threshold BI 1 to 226 Threshold BI 7 you can set the pickup thresholds of the binary
inputs of the device. The settings Thresh. BI 176V, Thresh. BI 88V or Thresh. BI 19V are possible.
Two-phase Time Overcurrent Protection (Protection Operating Quantities)
The two-phase overcurrent protection functionality is used in grounded or compensated systems where inter-
action of three-phase devices with existing two-phase protection equipment is required. Via parameter 250
50/51 2-ph prot the time overcurrent protection can be configured to two or three-phase operation. If the
parameter is set to ON, the value 0 A instead of the measured value for Ι
B
is used permanently for the
threshold comparison so that no pickup is possible in phase B. All other functions, however, operate in three
phases.
Ground Fault Protection (Protection Operating Quantities)
Parameter 613 50N/51N/67N w. defines whether ground fault protection, breaker failure protection or Fuse
Failure Monitor is either to operate using measured values (Ignd (measured))) or the quantities calculated
from the three phase currents (3I0 (calcul.)). In the first case, the measured quantity at the fourth
current input is evaluated. In the latter case, the summation current is calculated from the three phase current
inputs. If the device features a sensitive ground current input (measuring range starts at 1 mA), the ground
fault protection always uses the calculated variable 3I0. In this case, parameter 613 50N/51N/67N w. is not
available.
Voltage Protection (Protection Operating Quantities)
In a three-phase connection, the fundamental harmonic of the largest of the three phase-to-phase voltages
(Vphph) or phase-ground voltages (Vph-n) or the positive sequence voltage (V1) or the negative sequence
voltage (V2) is supplied to the overvoltage protection elements. In three-phase connection, undervoltage
protection relies either on the positive sequence voltage (V1) or the smallest of the phase-to-phase voltages
(Vphph) or the phase-to-ground voltages (Vph-n). This is configured by setting the parameter value in
address 614 OP. QUANTITY 59 and 615 OP. QUANTITY 27.
With single-phase voltage transformers, a direct comparison of the measured quantities with the threshold
values is carried out and the parameterization of the characteristic quantity switchover is ignored.
NOTE
If parameter 213 VT Connect. 3ph is set to Vph-g, VSyn, the voltage measured by voltage trans-
former 1 is always used for voltage protection. Then parameters 614 and 615 are not available.
NOTE
If parameter 213 VT Connect. 3ph is set to Vab, Vbc, VSyn or Vab, Vbc or Vab, Vbc, Vx, the
setting option Vph-n for parameter 614 and 615 is not available.
Settings
Addresses which have an appended “A” can only be changed with DIGSI, under “Additional Settings”.
The table indicates region-specific default settings. Column C (configuration) indicates the corresponding
secondary nominal current of the current transformer.
Addr.
Parameter C Setting Options Default Setting Comments
201 CT Starpoint towards Line
towards Busbar
towards Line CT Starpoint
2.1.3.3
Functions
2.1 General
SIPROTEC 4, 7SJ80, Manual 43
E50417-G1140-C343-A8, Edition 12.2017
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