5
The feeder terminal includes five modules. Their
function is explained in the following table.
Description
of function
Design
Module
Function
Protection module SPCJ 4D29
Overcurrent and earth-fault protection.
Measures, records and indicates locally and remotely three
phase currents and neutral current.
Control module SPTO 1D2
Reads and indicates locally and remotely status data of
maximum three disconnectors or circuit breakers.
Reads and indicates locally and remotely maximum six
external binary signals.
Measures and indicates locally and remotely three phase
currents, active and reactive power and energy.
Transfers local or remote open and close commands for one
circuit breaker.
I/O module SPTR 3B12 or
Includes 12 optically isolated binary inputs, trip and close
SPTR 3B13
output contacts and IRF alarm contact.
Power supply module
Forms the internal voltages required by the other modules.
SPGU 240A1 or SPGU 48B2
Energizing input module
Includes matching transformers and their tuning electronics
SPTE 4F1 (SPAC 310 C) or
for three phase currents and neutral current.
SPTE 4F2 (SPAC 312 C)
Includes the motherboard with three signalling output con-
tacts and electronics for the mA inputs.
The combined overcurrent and earth-fault pro-
tection module SPCJ 4D29 is a Euro-size (100
x 160 mm) withdrawable module.
The control module type SPTO 1D2 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 board SPTR
3B_ is located behind the front PC board and is
fastened by screws to the front PC board.
The power supply module SPGU 240 A1 or
SPGU 48 B2 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 module SPCJ 4D29 is fastened
to the case by means of two finger screws and the
control module SPTO 1D2 by means of four
finger screws. These modules are removed by
undoing the finger screws and pulling the mod-
ules out of the subrack. To be able to remove the
I/O module the control module has to be with-
drawn from the case and the screws of the I/O
module have to be removed from the front PC
board.
The energizing input module SPTE 4F1 or
SPTE 4F2 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.
