Application Guide - NP900 Series
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A996A
User settable variables are binary signals from the system. Blocking signal needs to reach
the IED minimum of 5 ms before the set operating delay has passed for blocking to be
active in time.
3.7.6.4
O
PERATING TIME CHARACTERISTICS FOR ACTIVATION AND RESET
The operating timers’ behavior of the function can be set for activation and the cold load
pick up situation monitoring and release.
In the following table are presented the setting parameters for the function time
characteristics.
Table 3.7.6.4-291 Operating time characteristics setting parameters.
Name
Range
Step
Default Description
Tpha
0.000…1800.000s 0.005s 10.000s Delay time setting for the alarm timer from the phase
currents measured THD.
TI01
0.000…1800.000s 0.005s 10.000s Delay time setting for the alarm timer from the residual
current I01 measured THD.
TI02
0.000…1800.000s 0.005s 10.000s Delay time setting for the alarm timer from the residual
current I02 measured THD.
3.7.6.5
E
VENTS AND REGISTERS
The THD function generates events and registers from the status changes of the alarm
function when it is activated. Recorded signals are Start and Alarm signals per monitoring
element and common blocked signals. To main event buffer is possible to select status
“On” or “Off” messages.
In the function is available 12 last registers where the triggering event of the function (THD
start, alarm or blocked) is recorded with time stamp and process data values.
