4
Auto-reclosing
The control module SPTO 6D3 is capable of
performing five auto-reclosings. Each auto-
reclose cycle can be started by three different
start initiation signals delivered by the protec-
tion relay modules of the feeder terminal. An
auto-reclose system can deliver an open com-
mand to the breaker. Thus either the starting
signal or the tripping signal of a particular
protection relay module can be used for starting
auto-reclose sequences.
In double busbar systems with two circuit break-
ers (duplex-systems) the auto-reclose function
includes a so called duplex logic, which routes
the closing command selectively to the circuit
breaker last closed.
The dead times of the different auto-reclose
cycles can be independently determined. The
reclaim time can also be determined by the user.
Block schematic
diagram
(modified 96-12)
Fig. 1. Block schematic diagram for the control module SPTO 6D3 including an optional
measuring module SPTM 8A1.
E ( )
Channel 11
SPTM
8A1
AR1,AR2,AR3
t
Open1…6 /
Close1…6
Chann.
8…13
Signal
output
control
Signal
5 or 6
SPTO 6D3
Enable
SPA-bus
Read
status
Channels
8…17
Channels
1…7
Open/close
output
control
Inter-
locking
Read
status
Ι
O
SPA-bus
SPA-bus
Indication
Direct
output
control
&
Indication
1
1
Indication
Measure-
ment
SPA-bus
Auto-
reclose
Q (mA2)
3I
3U
P (mA1)
&
Channel 10
ARINH
Read
status
Remote/local-
key switch
EXTAR
Chann.14