ABB Relion 670 Series Technical Reference Manual page 982

Section 15
Monitoring
15.10.5
15.11
15.11.1
15.11.2
976
Technical data
Table 599: technical data
Function
Buffer capacity
Resolution
Accuracy
Trip value recorder
Introduction
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).
Principle of operation
Trip value recorder (TVR)calculates and presents both fault and pre-fault magnitudes
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. The
calculated data is input information to the fault locator (FL).
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
Maximum number of events in disturbance report
Maximum number of disturbance reports
1MRK505222-UUS C
Value
150
100
1 ms
Depending on time
synchronizing
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