ABB SPAC 536 C User Manual page 4

4
The feeder terminal is designed to be used for
the selective short-circuit and earth-fault pro-
tection. Feeder protection type SPAC 536 /636
C3, which includes a combined overcurrent and
earth-fault relay module is used for feeder short-
circuit, time overcurrent and earth-fault protec-
tion in solidly, resistant or resonant earthed
networks. The feeder terminal type SPAC 536/
636 C1 includes a combined overcurrent and
earth-fault relay module and an additional di-
rectional earth-fault relay module and it is used
for overcurrent and earth-fault protection in
isolated neutral networks.
The control module SPTO 6D3 included in
feeder terminal indicates locally by means of
LED indicators the status of seven disconnec-
tors or circuit breakers. Further, the module
allows status information from the circuit break-
ers and the disconnectors to be transmitted to
the remote control system, and six objects to be
opened and closed over the remote control
system. The status information and the control
signals are transmitted over the serial bus. Also
local control is possible using the push buttons
on the front panel of the control module.
Uo
Fig. 2. Basic functions of the integrated feeder terminal SPAC 536 C or SPAC 636 C.
Auto-reclosing is integrated in the control mod-
ule. Five successive auto-reclose cycles can be
carried out.
The control module measures and indicates the
three phase currents and the three phase-to-
phase voltages. Active and reactive power can be
measured via two mA inputs or by using the
internal current and voltage signals. When the
mA inputs are used, external measuring trans-
ducers are needed.
Energy can be calculated on the basis of the
measured power values or by using one input as
an energy pulse counter. The measured values
can be indicated locally and remotely as scaled
values.
The combined overcurrent and earth-fault relay
module and the directional earth-fault relay
module measures and records the three phase
currents, the neutral current and the residual
voltage. All the measured and recorded values
are displayed locally and can be transmitted to
the remote control system over the SPA bus.
O
3I>
Ι
I
I
SIGNALLING
3
I
3
U
P
Q
E
O -> I
READY
O <-> I
Io
SPAC 536 C
PROTECTION
SERIAL
- OVERCURRENT
BUS
- NON-DIRECTIONAL EARTH-FAULT
- DIRECTIONAL EARTH-FAULT
MEASUREMENT
- PHASE CURRENTS
- PHASE-TO-PHASE VOLTAGES
- ACTIVE AND REACTIVE POWER
- ENERGY
CONTROL
- CB AND ISOLATOR STATUS
- LOCAL AND REMOTE CONTROL
- MIMIC DISPLAY
- INTERLOCKING
AUTOMATION
- AUTORECLOSING