The reset time is identical for both DT or wattmeter IDMT. The reset time depends on
the Reset delay time setting.
Timer calculates the start duration value START_DUR, which indicates the
percentage ratio of the start situation and the set operation time. The value is available
in the monitored data view.
Blocking logic
There are three operation modes in the blocking function. The operation modes are
controlled by the BLOCK input and the global setting in Configuration/System/
Blocking mode which selects the blocking mode. The BLOCK input can be controlled
by a binary input, a horizontal communication input or an internal signal of the
protection relay's program. The influence of the BLOCK signal activation is
preselected with the global setting Blocking mode.
The Blocking mode setting has three blocking methods. In the "Freeze timers" mode,
the operation timer is frozen to the prevailing value, but the OPERATE output is not
deactivated when blocking is activated. In the "Block all" mode, the whole function is
blocked and the timers are reset. In the "Block OPERATE output" mode, the function
operates normally but the OPERATE output is not activated.
4.2.6.5 Timer characteristics
In the wattmetric IDMT mode, the OPERATE output is activated based on the timer
characteristics:
GUID-FEA556F2-175E-4BDD-BD0F-52E9F5499CA8 V3 EN (Equation 30)
t[s]
operation time in seconds
k set value of
Time multiplier
P
ref
set value of
Reference power
P
cal
calculated residual power
1MRS758755 A Section 4
Protection functions
REC615 and RER615 367
Technical Manual
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