The function can be operating on instant or time delayed mode. In time delayed mode the operation
can be selected for de nite time.
Inputs for the function are the operating mode selections, setting parameters and measured and pre-
processed magnitudes and binary input signals. Function outputs START, TRIP and BLOCKED signals
which can be used for direct IO controlling and also for user logic programming. The function registers
its operation into 12 last time-stamped registers and also generates general time stamped ON/OFF
events to the common event buffer from each of the three output signal. In instant operating mode the
function outputs START and TRIP events simultaneously with equivalent time stamp. Time stamp
resolution is 1ms. Function provides also cumulative counters for START, TRIP and BLOCKED events.
Pick-up characteristics
Pick-up of the PGS function is controlled by
Pick-up setting Mag
setting parameter, which de nes the
maximum/minimum allowed measured magnitude before action from the function. The function
constantly calculates the ratio in between the set and measured magnitude. Reset hysteresis is user
settable (3% by default) in the function and is always related to the
Pick-up setting Mag
value.
Table. 5.4.22. - 168. Pick-up characteristics setting
Name
Description
Range
Step
Default
PS# Pick-up setting Mag#/calc >/<
Pick-up magnitude
-5000000.0000…5000000.0000
0.0001
0.01
PS# Setting hysteresis Mag#
Setting hysteresis
0.0000…50.0000%
0.0001%
3%
De nite operating time delay
Delay setting
0.000…1800.000s
0.005s
0.04s
Release time delays
Pick-up release delay
0.000…1800.000s
0.005s
0.06s
The pick-up activation of the function is not directly equal to start-signal generation of the function.
Start signal is allowed if blocking condition is not active.
Resetting characteristics can be set according to the application. Default setting is delayed with 60 ms
and the time calculation is held during the release time.
When using the release delay option where the operating time counter is calculating the operating time
during the release time, function will not trip if the input signal is not activated again during the release
time counting.
Function blocking
In the blocking element the block signal is checked in the beginning of each program cycle. Blocking
signal is received from the blocking matrix for the function dedicated input. If the blocking signal is not
activated when the pick-up element activates, a START signal is generated and the function proceeds
to the time characteristics calculation.
If blocking signal is active when pick-up element activates a BLOCKED signal will be generated and the
function shall not process the situation further. If START function has been activated before blocking
signal it will reset and the release time characteristics are processed as in case of when pick-up signal
is reset.
From blocking of the function a HMI display event as well as time stamped blocking event with
information of the startup voltage values and fault type is issued.
Blocking signal can be tested also in the commissioning phase of the stage by software switch signal
when relay common and global testing mode is activated.
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 passedfor blocking to be active in time.
AQ-T257
Instruction manual
Version: 2.00
203
© Arcteq Relays Ltd
