Operating time characteristics for trip and reset
This function supports de nite time delay (DT). For detailed information on this delay type refer to
chapter General properties of a protection function.
Events and registers
The PQS function generates events and registers from the status changes of start, trip and blocked. To
main event buffer is possible to select status “On” or “Off” messages. The PQS function offers four
independent instances which events are segregated for each instance operation.
In the function is available 12 last registers where the triggering event of the function (start, trip or
blocked) is recorded with time stamp and process data values.
Table. 5.4.15. - 135. Event codes of the PQS function.
Event Number
Event channel
Event block name
Event Code
Description
6400
100
PQS1
0
Start ON
6401
100
PQS1
1
Start OFF
6402
100
PQS1
2
Trip ON
6403
100
PQS1
3
Trip OFF
6404
100
PQS1
4
Block ON
6405
100
PQS1
5
Block OFF
In the register of the PQS function is recorded start, trip or blocked “On” event process data. In the
table below is presented the structure of PQS function register content. This information is available in
12 last recorded events for all provided instances separately.
Table. 5.4.15. - 136. Register content.
Date & Time
Event code
Trigger
power
Fault power
Prefault power
Trip time
remaining
Used
SG
dd.mm.yyyy
hh:mm:ss.mss
6400-6405
Descr.
Start average
power
Trip -20 ms
averages
Start -200 ms
averages
0ms -1800s
1 - 8
5.4.16. Transformer status monitoring (TRF)
Transformer status monitoring function (TRF) is designed to be the common place for set up all
necessary transformer data and to select the used transformer protection functions. Settings related to
the protection functions can be edited also inside of each related function and after changed they will
be updated into TRF function also. TRF function calculates many transformer related properties which
are used in functions for protecting and monitoring the transformer. Basically for standard transformer
only name plate data and CT scalings are needed to get the relay scale automatically all measurement
signals to the transformer. For special transformers manual set values can be applied to cover rarely
met transformers properties. In addition to this TRF function counts transformer cumulative overloading
and high overcurrent time.
TRF function can output light/no load, HV side inrush, LV side inrush, normal load, overloading and
heavy overloading signals to be used in indication or in logic programming. From these signals TRF
also generates events if so wanted.
AQ-T257
Instruction manual
Version: 2.00
© Arcteq Relays Ltd
130
