operating mode selections
setting parameters
digital inputs and logic signals
measured and pre-processed voltage and current magnitudes.
The function registers its operation into the last twelve (12) time-stamped registers and also generates
general time-stamped ON/OFF events to the common event buffer from the triggering output signal.
The time stamp resolution is 1 ms. The function also provides a resettable cumulative counter for fault
locator triggering events.
Measured input
The function block uses analog current and voltage measurements as well as calculated phase-to-
phase loop impedances.
Fault locator triggering
There are several conditions that have to be met in order for the fault locator to trigger and record the
distance. After receiving a triggering signal the function checks whether the calculation is blocked
(calculation blocking signals are determined by the user in the
Block calculation
matrix). Then the
function checks whether phase-to-earth voltages are available. If not available, the fault locator can
only record phase-to-phase impedance loops; if available, the fault locator can also record phase-to-
neutral impedance loops. The recorded impedance loop is chosen from the available options
depending on which of the measured phase currents exceeded the set
Trigger current>
at the time the
triggering signal was received. See the tables below.
Table. 5.3.8. - 73. Pick-up settings.
Name
Range
Step
Default
Description
Trigger
current>
0.0...40.0 ×
I
n
0.1 × I
n
1.0 × I
n
Affects the decision which impedance loop is recorded, or if anything is
recorded at all (see the table below).
Reactance
per km
0.001…
5.000 Ω/km
0.001
Ω/km
0.125
Ω/km
Used to calculate the distance to a fault.
Table. 5.3.8. - 74. Current conditions needed to trigger impedance recording.
Currents over limit
P-E voltages available
P-E Voltage not available
Recorded impedance
Recorded impedance
IL1, IL2, IL3
XL12
XL12
IL1, IL2
XL12
XL12
IL2, IL3
XL23
XL23
IL1, IL3
XL31
XL31
IL1
XL1
No trigger
IL2
XL2
No trigger
IL3
XL3
No trigger
If none of the current measurement requirements are ful lled when the function receives a triggering
signal, it will not record impedance.
AQ-E215
Instruction manual
Version: 2.01
91
© Arcteq Relays Ltd