The last measured and maximum travel time are stored in nonvolatile memory and
these values are not cleared until the reset input (RST_TRV_ T) is set to TRUE or reset
from the clear menu.
When the measured opening travel time is longer than the value set with the
Open
alarm time
setting, the TRV_T_OP_ALM output is activated. Respectively, when the
measured closing travel time is longer than the value set with the
Close alarm time
setting, the TRV_T_CL_ALM output is activated.
It is also possible to block the TRV_T_CL_ALM and TRV_T_OP_ALM alarm signals by
activating the BLOCK input.
7.2.5 Application
Earthing switches or disconnectors are usually located either in metal- clad draw
out switchgear or outside in switch yard or pole mounted pole mounted. These
switches are operated on no load when circuit breaker is opened. Mechanical
actuation is affected due to continued exposure of varying weather conditions.
Supervision of following parameters helps understanding the mechanical condition
and need for maintenance:
• Increasing contact travel time might be indication e.g., of mechanical wear or
lubrication problem.
• Certain maintenance actions are dependent on operation counter value.
• Mechanism may be stuck if switch is in same position long period of time.
Inactivity time measurement guides operator for periodic movement.
7.2.6 Signals
7.2.6.1 ESDCSSWI Input signals
Table 1316: ESDCSSWI Input signals
Name Type Default Description
BLOCK BOOLEAN 0=False Block all the alarm
and lockout indica-
tions
POSOPEN BOOLEAN 0=False Signal for open po-
sition of apparatus
from I/O
POSCLOSE BOOLEAN 0=False Signal for close po-
sition of apparatus
from I/O
OPEN_EXE BOOLEAN 0=False Signal for open com-
mand to coil
CLOSE_EXE BOOLEAN 0=False Signal for close com-
mand to coil
RST_TRV_T BOOLEAN 0=False Reset input for switch
closing and opening
travel times
Condition monitoring functions 1MRS759142 F
1380 REX640
Technical Manual
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