The function's output ALARM signal can be used for direct I/O controlling and also for user logic
programmiing. The function generates general time-stamped ON/OFF events to the common event
buffer from the output signal. The function also provides a resettable cumulative counter for ALARM
events.
Measured input
The function block uses analog current measurement values and always uses peak-to-peak
measurement from samples. The monitored magnitude is equal to fundamental frequency RMS values
of phase current measurement channels.
Table. 5.3.2. - 48. Measurement inputs of the I0> function.
Signal
Description
Time base
I01RMS
Fundamental RMS measurement of coarse residual current measurement input I01
5 ms
I02RMS
Fundamental RMS measurement of sensitive residual current measurement input I02
5 ms
I0Calc
Fundamental RMS value of the calculated zero sequence current from the three phase currents
5 ms
The selection of the AI channel in use is made with a setting parameter.
Pick-up
The
I0
set
setting parameter controls the pick-up of the I0> function. This de nes the maximum allowed
measured current before action from the function. The function constantly calculates the ratio
between the
I0
set
and the measured magnitude (
I
m
) for each of the three phases. The reset ratio of 97
% is built into the function and is always relative to the
I0
set
value.
Table. 5.3.2. - 49. Pick-up settings.
Name
Description
Range
Step
Default
I0
set
Pick-up setting
0.10…40.00 × I
n
0.001 × I
n
1.20 × I
n
Events and registers
The non-directional earth fault function (abbreviated "EMON" in event block names) generates events
and registers from the status changes in ALARM events. The user can select the status ON or OFF for
messages in the main event buffer.
The triggering event of the function (START, TRIP or BLOCKED) is recorded with a time stamp and with
process data values.
Table. 5.3.2. - 50. Event codes.
Event number
Event channel
Event block name
Event code
Description
8642
135
EMON1
2
I0> (50N) Detect ON
8643
135
EMON1
3
I0> (50N) Detect OFF
The function registers its operation into the last twelve (12) time-stamped registers. The table below
presents the structure of the I0> function's register content.
AQ-E215
Instruction manual
Version: 2.01
69
© Arcteq Relays Ltd
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