Siemens siprotec SJ62 User Manual page 112

Inrush Restraint
Manual Close Mode
(Phases, ground)
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
Table 2-9 Preferential values of standardized currents for user-defined reset curves
I/Ip = 1 to 0.86 I/Ip = 0.84 to 0.67
1.00 0.93 0.84
0.99 0.92 0.83
0.98 0.91 0.81
0.97 0.90 0.80
0.96 0.89 0.78
0.95 0.88 0.77
0.94 0.86
Figure 2-30 Using a user-defined curve
When applying the protection device to transformers where high inrush currents are
to be expected, the 7SJ62/63/64 can make use of an inrush restraint function for the
directional overcurrent elements 67-1, 67-TOC, 67N-1 and 67N-TOC as well as the
non-directional overcurrent elements. The inrush restraint option is enabled or dis-
abled in 2201 INRUSH REST. (in the settings option non-directional time overcur-
rent protection). The characteristic values of the inrush restraint are already listed in
the section discussing the non-directional time overcurrent (Section 2.2.10).
When a circuit breaker is closed onto a faulted line, a high speed trip by the circuit
breaker is often desired. For overcurrent or high-set element the delay may be by-
passed via via a "Manual Close" signal, thus resulting in instantaneous tripping. The
internal "Manual close" signal is built from the binary input signal „>Manual Close"
(no. 561). The internal "Manual close" signal remains active as long as the binary input
signal „>Manual Close" is active, but at lease for 300 ms (see the following logic
diagram). To enable the device to react properly on occurrence of a fault in the phase
elements after manual close, address 1513 MANUAL CLOSE has to be set accordingly.
Accordingly, address 1613 MANUAL CLOSE is considered for the ground path ad-
dress. Thus, the user determines for both elements, the phase and the ground ele-
ment, what pickup value is active with what delay when the circuit breaker is closed
manually.
2.3 Directional Overcurrent Protection 67, 67N
I/Ip = 0.66 to 0.38
0.75 0.66
0.73 0.64
0.72 0.63
0.70 0.61
0.69 0.59
0.67 0.56
I/Ip = 0.34 to 0.00
0.53 0.34 0.16
0.50 0.31 0.13
0.47 0.28 0.09
0.44 0.25 0.06
0.41 0.22 0.03
0.38 0.19 0.00
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