Siemens SIPROTEC 7SJ62 Manual page 116

Functions
2.3 Directional Overcurrent Protection 67, 67N
Figure 2-33
Inrush Restraint
When applying the protection device to transformers where high inrush currents are to be expected, the
7SJ62/64 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 disabled in 2201 INRUSH REST. (in the settings option non-directional time overcurrent protection). The
characteristic values of the inrush restraint are already listed in the section discussing the non-directional time
overcurrent (Section 2.2.11).
Manual Close Mode (phases, ground)
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 bypassed via a Manual Close pulse, thus resulting in instan-
taneous tripping. This pulse is prolonged by at least 300 ms. To enable the device to react properly on occur-
rence of a fault in the phase elements after manual close, address 1513 MANUAL CLOSE has to be set accord-
ingly. Accordingly, address 1613 MANUAL CLOSE is considered for the ground path address. Thus, the user
determines for both elements, the phase and the ground element, what pickup value is active with what delay
when the circuit breaker is closed manually.
External Control Switch
If the manual close signal is not from the 7SJ62/64 device, that is, neither sent via the built-in operator interface
nor via a serial port but directly from a control acknowledgment switch, this signal must be passed to a
7SJ62/64 binary input, and configured accordingly („>Manual Close"), so that the element selected for
MANUAL CLOSE can become effective. Inactive means that all elements (phase and ground) operate with
the configured trip times even with manual close.
116
Using a user-defined curve
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008