ABB Relion 650 Series Technical Manual page 472

Section 13
Monitoring
13.10 Trip value recorder
13.10.1 Functionality
Information about the pre-fault and fault values for currents and voltages are vital for the
disturbance evaluation.
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).
13.10.2 Function block
The Trip value recorder has no function block of it's own.
13.10.3 Signals
13.10.3.1 Input signals
The trip value recorder function uses analog input signals connected to A1RADR to A3RADR (not
A4RADR).
13.10.4 Operation principle
Trip value recorder calculates and presents both fault and pre-fault magnitudes as well as the
phase angles of all the selected analog input signals. The parameter
which input signal is used as the angle reference. The calculated data is input information to the
fault locator .
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 fault interception 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 .
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