ABB GDC806A0101 inverter control cabinet logic board
The complete manual for the relay SPAJ 140 C contains the following submanuals:
General relay description for SPAJ 140 C 1MRS 750629
General characteristics of D type relay modules 1MRS 750066-MUM EN
Combined overcurrent and earth-fault relay module
type SPCJ 4D29 1MRS 750119
Features Three-phase, low-set phase overcurrent unit
with definite time or inverse definite minimum
time (IDMT) characteristic
Three-phase, high-set phase overcurrent unit
with instantaneous or definite time function
Low-set, non-directional earth-fault unit with
definite time or inverse definite minimum time
(IDMT) characteristic
High-set, non-directional earth-fault unit with
instantaneous or definite time function
Built-in breaker failure protection function
Two heavy-duty and four light-duty output
relays with field-selectable configuration
Extensive data communication capabilities over
built-in serial port
Outstanding design flexibility for easy selection
of appropriate operation schemes for different
applications
Numerical display of setting values, measured
values, memorized fault values, fault codes etc.
Enhanced system reliability and availability due
to continuous hardware and software self-supervision with auto-diagnosis
Powerful software support for setting and
parametrizing of the relay and for recording of
relay parameters with a portable PC.
The combined overcurrent and earth-fault relay
SPAJ 140 C is intended to be used for the
selective short-circuit and earth-fault protection
of radial feeders in solidly earthed, resistance
earthed or impedance earthed power systems.
The integrated protection relay includes a phase
overcurrent unit and an earth-fault unit with
flexible tripping and signalling facilities. The
overcurrent and earth-fault relays can also be
used inother applications requiring single-, twoor three-phase overcurrent protection and nondirectional
earth-fault protection. The combined overcurrent and earth-fault relay also features circuit breaker failure protection.

The combined overcurrent and earth-fault relay
is a secondary relay to be connected to the
current transformers of the protected object.
The three-phase overcurrent unit and the earth fault unit continuously measure the phase cur rents and the neutral current of the protected
object. On detection of a fault the relay starts,
trips the circuit breaker, initiates auto-reclosing,
provides alarm, records fault data etc. in accord ance with the application and the configured
relay functions.
When the phase current exceeds the set start
current of the low-set stage I>, the overcurrent
unit starts delivering a start signal after a preset
~60 ms start time. When the set operate time at
definite time operation or the calculated operate
time at inverse time operation elapses, the over current unit operates. In the same way
the high set stage I>> of the overcurrent unit starts deliv ering a start signal after a preset ~40 ms start
time, when the set start current is exceeded.
When the set operate time elapses, the overcur rent unit operates.
When the earth-fault current exceeds the set
start current of the low-set stage I0>, the earth fault unit starts delivering a start signal after a
preset ~60 ms start time. When the set operate
time at definite time operation or the calculated
operate time at inverse time operation elapses,
the earth-fault unit operates. In the same way
the high-set stage I0>> of the earth-fault unit