Siemens siprotec SJ62 User Manual page 83

2 Functions
Manual Close Mode
(Phases, ground)
External Control
Switch
Internal Control
Function
81
If the current exceeds the value set in address 2205 I Max, no further restraint will
take place for the 2nd harmonic.
The lower operating limit of the restraining function amounts to 0.25 times the sec-
ondary nominal current of the fundamental harmonic (250 mA with 1 A sec. nominal
current). The blocking is thus not enabled for lower currents. This also applies to the
ground current and, if necessary, should be taken into consideration during setting of
the pickup threshold of the ground stage.
When a circuit breaker is closed onto a faulted line section, a high speed trip by the
circuit breaker is usually desired. For overcurrent or high-set elements the delay may
be bypassed 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 1213 MANUAL CLOSE has to be set accordingly.
Accordingly, address 1313 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.
Figure 2-15 Manual close feature
If the manual closing signal is not from a 7SJ62/63/64 relay, that is, neither sent via
the built-in operator interface nor via a series interface, but, rather, directly from a
control acknowledgment switch, this signal must be passed to a 7SJ62/63/64 binary
input, and configured accordingly („>Manual Close"), so that the element selected
for MANUAL CLOSE will be effective. Its alternative Inactive means that the element
operates as configured even with manual close.
The manual closing information must be allocated via CFC (interlocking task-level)
using the CMD_Information block, if the internal control function is used (see Figure
2-16).
Figure 2-16 Example for manual close feature using the internal control function
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015