Function Block - ABB REG650 Technical Manual

1MRK 502 034-UEN -
13.10.2
13.10.3
13.10.3.1
13.10.4
Technical Manual
The Trip value recorder calculates the values of all selected analog input signals
connected to the Disturbance report function. The result is magnitude and phase
angle before and during the fault for each analog input signal.
The trip value recorder information is available for the disturbances locally in the
IED.
The trip value recorder information is an integrated part of the disturbance record
(Comtrade file).

Function block

The Trip value recorder has no function block of it's own.
Signals
Input signals
The trip value recorder function uses analog input signals connected to A1RADR
to A3RADR (not A4RADR).
Operation principle
Trip value recorder calculates and presents both fault and pre-fault amplitudes as
well as the phase angles of all the selected analog input signals. The parameter
ZeroAngleRef points out which input signal is used as the angle reference.
When the disturbance report function is triggered the sample for the fault
interception is searched for, by checking the non-periodic changes in the analog
input signals. The channel search order is consecutive, starting with the analog
input with the lowest number.
When a starting point is found, the Fourier estimation of the pre-fault values of the
complex values of the analog signals starts 1.5 cycle before the fault sample. The
estimation uses samples during one period. The post-fault values are calculated
using the Recursive Least Squares (RLS) method. The calculation starts a few
samples after the fault sample and uses samples during 1/2 - 2 cycles depending on
the shape of the signals.
If no starting point is found in the recording, the disturbance report trig sample is
used as the start sample for the Fourier estimation. The estimation uses samples
during one cycle before the trig sample. In this case the calculated values are used
both as pre-fault and fault values.
The name of the analog input signal that appears in the Trip value recorder function
is the user-defined name assigned when the IED is configured. The same name is
used in the Disturbance recorder function .
Section 13
Monitoring
417