ABB SPAC 531 C User Manual And Technical Description page 44

Maintenance
and repairs
Exchance and
spare parts
44
When the protective relay is used under the
conditions specified in the section "Technical
data", the relay is practically maintenance-free.
The relay modules include no parts or compo-
nents subject to abnormal physical or electrical
wear under normal operating conditions.
If the environmental conditions on site differ
from those specified, as to temperature and
humidity, or if the atmosphere around the relay
contains chemically active gases or dust, the
relay should be visually inspected in association
with the relay secondary testing. At the visual
inspection the following things should be noted:
- Signs of mechanical damage to relay case and
terminals
- Dust inside the relay cover or case; remove by
blowing air carefully
- Rust spots or signs of erugo on terminals, case
or inside the relay
Control module
Optional measuring module 1 (I, U, mA)
Optional measuring module 2 (I, U, P, Q)
Optional measuring module 3 (I, U, P, Q)
Three-phase phase overcurrent relay module
Directional neutral current relay module
I/O module for control signals, input voltage range 80...265 V dc
I/O module for control signals, input voltage range 30...80 V dc
I/O module for protection functions
Power supply module, 80...265 V ac or dc
Power supply module, 18...80 V dc
Rack without plug-in modules (SPAC 531 C)
Rack without plug-in modules (SPAC 631 C)
Counter contacts for multi-pole connectors X1...X6 including
accessories (included in relay delivery)
If the relay fails in operation or if the operating
values considerably differ from those mentioned
in the relay specifications, the relay should be
given a proper overhaul. Minor measures can be
taken by personnel from the customer's instru-
ment work-shop but all major measures involv-
ing overhaul of the electronics are to be taken by
the manufacturer. Please contact the manufac-
turer or his nearest representative for further
information about checking, overhaul and
recalibration of the relay.
Note!
Static protective relays are measuring instru-
ments and should be handled with care and
protected against moisture and mechanical stress,
especially during transport.
SPTO 6D3
SPTM 8A1
SPTM 6A2
SPTM 6A3
SPCJ 3C3
SPCS 3C4
SPTR 4D1
SPTR 4D2
SPTR 6B11
SPGU 240A1
SPGU 48B2
SPTK 8C3
SPTK 8C4
SPA-ZT6