ABB SPAC 315 C User Manual And Technical Description page 10

Measurement
functions
Supervision
functions
Serial
communication
Auxiliary power
supply
10
The control module SPTO 1D6 and the com-
bined overcurrent and earth-fault relay module
SPCJ 4D29 both measure analog signals.
The combined overcurrent and earth-fault relay
module measures three phase currents and the
neutral current. The module displays the cur-
rent values locally and transmits the informa-
tion via the SPA bus to the remote control
system. The protection relay module displays
the measured values as multiples of the rated
current of the used energizing input of the
feeder terminal.
The control module SPTO 1D6 measures five
analog signals; three phase currents, active and
reactive power. The transforming ratio of the
primary current transformers can be keyed in to
the control module. In that way it is possible to
Energizing current circuit monitoring and trip
circuit supervision are integrated into the con-
trol module SPTO 1D6. The trip circuit, i.e. the
OPEN circuit, is supervised using the constant
current injection principle. If the resistance of
the trip circuit exceeds a preset level, because of
loose contacts, oxidation or circuit discontinu-
The feeder terminal includes two serial commu-
nication ports, one on the front panel and the
other on the rear panel.
The 9-pin RS 232 connection on the front panel
is to be used for configuring the feeder terminal
and determining the circuit breaker/CB truck/
disconnector configuration, for loading the
For the operation of the feeder terminal a
secured auxiliary voltage supply is needed. The
power supply module SPGU240A1 or SPGU
48B2 forms the voltages required by the protec-
tion relay module, the control module and the
input/ output module.
The power supply module is a transformer con-
nected, i.e. galvanically isolated primary and
secondary side, flyback-type dc/dc converter.
The primary side of the power supply module is
display the measured phase currents as primary
values.
The control module measures the active and
reactive power via two mA inputs. External
measuring transducers are to be utilized. The
mA signals are scaled to actual MW and Mvar
values and the data is displayed locally and can
be transmitted to the remote control system.
Active energy is measured in two ways; either by
calculating the value from the measured power
values or by using input CHANNEL 7 as a pulse
counter input. In the latter case an external
energy meter with pulse output will be needed.
In both cases the energy measurement value is
displayed locally and can be transmitted to the
remote control system.
ity, an alarms signal is provided via output
SIGNAL 4.
The energizing current circuit monitoring func-
tion monitors the input energizing currents and
provides an alarm signal if one or two of the
phase currents are interrupted.
feeder-oriented interlocking program and other
data from a terminal or a PC.
The 9-pin RS 485 connection on the rear panel
connects the feeder terminal to the SPA bus. An
optional bus connection module type SPA-ZC
17 or SPA-ZC 21 is required.
protected with a slow 1 A fuse, F1, located on
the PC board of the control module.
A green LED indicator U
is lit when the power supply module is in opera-
tion. There are two versions of power supply
modules available. The secondary sides are iden-
tical, only the input voltage range is different.
The input voltage range is indicated on the front
panel of the control module.
on the front panel
aux