Setting Notes - Siemens siprotec SJ62 User Manual

2.14.6 Setting Notes

General Settings
Blocking Duration
for Manual-CLOSE
Detection
Restraint Time and
Dynamic Blocking
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
quence coordination is not applied, element 50-1 is to be used only with the relative
long time period (0.9 s).
Figure 2-84 Zone sequencing with a fault occurring at Tap Line 2 and the busbar
The internal automatic reclosure system will only be effective and accessible if
address 171 79 Auto Recl. is set Enabled during configuration. If not required,
this function is set to Disabled. The function can be turned ON or OFF under address
7101 FCT 79.
If no automatic reclosures are performed on the feeder for which the 7SJ62/63/64 is
used (e.g. cables, transformers, motors, etc.), the automatic reclosure function is dis-
abled by configuration. The automatic reclosure function is then completely disabled,
i.e. the automatic reclosure function is not processed in the 7SJ62/63/64. No messag-
es exist for this purpose and binary inputs for the automatic reclosure function are ig-
nored. All parameters of block 71 are inaccessible and of no significance.
Parameter 7103 BLOCK MC Dur. defines the reaction of the automatic reclosure
function when a manual closing signal is detected. The parameter can be set to
specify how long the auto reclose function will be blocked dynamically in case of an
external manual close-command being detected via binary input (356 „>Manual
Close"). If the setting is 0, the automatic reclosure system will not respond to a
manual close-signal.
The blocking time TIME RESTRAINT (address 7105) defines the time that must
elapse, after a successful reclosing attempt, before the automatic reclosing function is
reset. If a protective function configured for initiation of the auto-reclosure function pro-
vokes a new trip before this time elapses, the next reclosing cycle is started in case of
multiple reclosures. If no further reclosure is allowed, the last reclosure will be classed
as unsuccessful.
In general, a few seconds are sufficient. In areas with frequent thunderstorms or
storms, a shorter blocking time may be necessary to avoid feeder lockout due to se-
quential lightning strikes or flashovers.
A longer restraint time should be chosen if there is no possibility to monitor the circuit
breaker (see below) during multiple reclosing (e.g. because of missing auxiliary con-
tacts and and information on the circuit breaker ready status). In this case, the restraint
time should be longer than the time required for the circuit breaker mechanism to be
ready.
2.14 Automatic Reclosing System 79
240