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1MAC050144-MB C
Section 6
Supervision functions
615 series ANSI
431
Technical Manual
6.2.2
Function block
Figure 223:
Function block
6.2.3
Functionality
The trip circuit monitoring function TCM is designed for supervision of control circuits.
A fault in a control circuit is detected by using a dedicated output contact that contains the
monitoring functionality. The failure of a circuit is reported to the corresponding function
block in the IED configuration.
The function pickups and trips when TCM detects a trip circuit failure. The trip time
characteristic for the function is of definite time (DT) type. The function trips after a
predefined operating time and resets when the fault disappears.
The function contains a blocking functionality. Blocking deactivates the
ALARM
output
and resets the timer.
6.2.4
Operation principle
The function can be enabled and disabled with the
Operation
setting. The corresponding
parameter values are Enable and Disable.
The operation of trip circuit monitoring can be described by using a module diagram. All
the blocks in the diagram are explained in the next sections.
Figure 224:
Functional module diagram
TCM status
This module receives the trip circuit status from the hardware. A detected failure in the trip
circuit activates the timer.
Timer
Once activated, the timer runs until the set value
Trip delay time
is elapsed. The time
characteristic is according to DT. When the operation timer has reached the maximum
time value, the
ALARM
output is activated. If a drop-off situation occurs during the trip
time up counting, the reset timer is activated. If the drop-off time exceeds
Reset delay time
,
the trip timer is reset.
Содержание 615 Series ANSI
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