7SR210 & 7SR220 Applications Guide
Page 46 of 48
©2018 Siemens Protection Devices Limited
5.10.2.2
Load Blinder 1Ph
The single phase Load Blinder provides phase segregated blocking outputs. The
Inps
level is not considered
whereas operation of the load blinder is inhibited during earth fault conditions i.e. when the
Izps
level exceeds the
I21LB-1P IZPS
setting.
Figure 5.10.2.2-1 Logic Diagram 1 Phase
The single phase load blinder has the following setting parameters:
21LB – 1P Angle +ve
21LB – 1P Angle -ve
21LB – 1P Impedance
21LB – 1P VPPS
21LB – 1P IZPS
The design of single phase load blinder takes into consideration the following effects of a high unbalanced load
non-fault condition. The blinder is operated when:
a. Positive Sequence Voltage
Vpps
is not significantly changed. A high
21LB-1P VPPS setting
will allow
inhibiting Load Blinders in case of larger voltage drops (representing fault situation).
AND
b. Zero Sequence Current
Izps
is lower than
21LB-1P IZPS Setting.
,
AND
c. The impedance measured per phase is within the operate zone.
Zphase is calculated from Vphase (peak) and Iphase (peak). The calculated Zphase is used to
determine if the impedance for that phase is in the operate zone i.e. greater than
21LB-1P Impedance
setting and less than
21LB-1P Angle
settings.
Suitable settings can be chosen to provide outputs in the forward or reverse directions.
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