Arcteq AQ-E215, Instruction Manual

Page: 91 / 207

Pick-up
The U
set
setting parameter controls the pick-up of the U0> function. This de nes the maximum allowed
measured voltage before action from the function. The function constantly calculates the ratio
between the
U
set
and the measured magnitude (
U
m
) for each of the three voltages. The reset ratio of
97 % is built into the function and is always relative to the U
set
value. The setting value is common for
all measured amplitudes, and when the U
m
exceeds the U
set
value (in single, dual or all phases) it
triggers the pick-up operation of the function.
Table. 5.3.7. - 70. Pick-up settings.
Name Description Range Step Default
U
set
Pick-up setting
1.00…99.00 %U
n
0.01 %U
n
20 %U
n
Events and registers
The neutral overvoltage function (abbreviated "EMON" in event block names) generates events and
registers from the status changes in the ALARM signal. 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. 5.3.7. - 71. Event codes.
Event number Event channel Event block name Event code Description
8656 135 EMON1 16 U0> (59N) detected ON
8657 135 EMON1 17 U0> (59N) detected OFF
The table below presents the structure of the function's register content. This information is available
for the last twelve (12) recorded events for all provided instances separately.
Table. 5.3.7. - 72. Register content.
Date and time
Event
code
U0
meas
/U0
set
Used SG
dd.mm.yyyy
hh:mm:ss.mss
8656-8657
Descr.
The ratio between the residual voltage and the pick-up
setting.
Setting group 1...8
active.
5.3.8. Fault locator (21FL)
The fault locator is used for recording an estimated distance to the point where a fault has occurred. It
is mostly used in directional overcurrent protection or in distance protection applications but it can be
triggered by other protections as well. The function can be used if three phase currents and three
phase voltages have been connected to the relay. The triggering signals, the triggering current
and reactance per kilometer must be set in the con guration.
The operational logic consists of the following:
input magnitude processing
threshold comparator
output processing.
The inputs for the function are the following:
AQ-E215
Instruction manual
Version: 2.01
© Arcteq Relays Ltd 90