Controlling Protective Elements - Siemens siprotec SJ62 User Manual

2 Functions

2.14.4 Controlling Protective Elements

Cyclic Control
237
Depending on the reclosing cycle it is possible to control elements of the directional
and non-directional overcurrent protection by means of the automatic reclosure
system (Protective Elements Control). There are three mechanisms:
1. Time overcurrent elements may trip instantaneously depending on the automatic
reclosure cycle (T = 0), they may remain unaffected by the auto reclosing function
AR (T = T) or may be blocked (T = ∞). For further information see side title "Cyclic
Control".
2. The automatic reclosure states "79M Auto Reclosing ready" and "79M Auto Re-
closing not ready" can activate or deactivate the dynamic cold load pick-up func-
tion. This function is designed to influence time overcurrent elements (see also
Section 2.14.6 and Section 2.4) regarding thresholds and trip time delays.
3. The time overcurrent address 1x14A 50(N)-2 ACTIVE defines whether the 50(N)2
elements are to operate always or only with "79M Auto Reclosing ready" (see
Section 2.2).
Control of the overcurrent protection elements takes effect by releasing the cycle
marked by the corresponding parameter. The cycle zone release is indicated by the
messages „79 1.CycZoneRel" to „79 4.CycZoneRel". If the automatic reclo-
sure system is in normal state, the settings for the starting cycle apply. These settings
always take effect when the automatic reclosure system assumes normal state.
The settings are released for each following cycle when issuing the close command
and starting the blocking time. Following a successful auto reclosing operation (re-
straint time elapsed) or when reset after blocking, the automatic reclosure system
assumes normal state. Control of the protection is again assumed by the parameters
for the starting cycle.
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015