6
The feeder terminals type SPAC 315 C and
SPAC 317 C include four withdrawable func-
tional modules and one fixed functional module
each. The main functions of the modules are
specified in the following table.
Module
Function
Protection relay module
Phase overcurrent protection and earth-fault protection.
SPCJ 4D29
Definite time or inverse time low-set overcurrent and earth-
fault protection, instantaneous or definite time high-set over-
current and earth-fault protection.
Control module SPTO 1D6
Reads and displays locally and remotely status data of maxi-
mum three disconnectors, CB trucks or CBs.
Reads and displays locally and remotely max. six external
binary signals.
Three phase currents, active and reactive power and energy
are measured and displayed locally and remotely.
Transfers local or remote open and close commands for one
circuit breaker.
I/O module SPTR 2B17 or
Includes 12 optically isolated binary inputs, trip and close
SPTR 2B18
output relays. Single-pole or double-pole circuit breaker
control and trip circuit supervision electronics.
Power supply module
Forms the internal sypply voltages required by the other
SPGU 240A1 or SPGU 48B2
function modules.
Energizing input module
Includes matching transformers and their tuning electronics
SPTE 4F6 in SPAC 315 C or
for three phase currents and the neutral current.
SPTE 4F9 in SPAC 317 C
Includes the motherboard with four signalling output con-
tacts and the electronics for the mA inputs.
Includes the Internal Relay Fault alarm output relay.
The combined phase overcurrent and earth-
fault relay module SPCJ 4D29 is a Euro-size
(100 mm x 160 mm) withdrawable unit.
The control module type SPTO 1D6 is also
withdrawable. The control module includes two
PC boards; a CPU board and a front PC board
which are joined together.
The I/O module SPTR 2B_ is located behind
the front PC board and is fixed to the front PC
board by screws.
The power supply module SPGU 240A1 or
SPGU 48B2 is located behind the front PC
board of the control module and can be with-
drawn from the case after the control module
has been removed.
The protection relay module SPCJ 4D29 is
fastened to the relay case by means of two finger
screws and the control module type SPTO 1D6
by means of four finger screws.
These modules are removed by undoing the
finger screws and pulling the modules out of the
aluminium case. Before the I/O module can be
removed the control module has to be with-
drawn from the case and the screws holding the
I/O module attached to the front PC board have
to be removed.
The energizing input module SPTE 4F6 or
SPTE 4F9 is located behind the front PC board
of the control module on the left side of the case.
A screw terminal block, the rear plate and the
mother PC board are connected to the energiz-
ing input module.
The mother PC board contains the card connec-
tors for the plug-in modules, the detachable
multi-pole connector strips of the inputs and
outputs, the tuning resistors of the secondary
burden of the matching transformers and the
electronics of the signal outputs and mA inputs.
Description of
function
Design
