ABB REB650, Technical Manual

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12.7.3 Signals
12.7.3.1 Input signals
The trip value recorder function uses analog input signals connected to A1RADR to
A3RADR (not A4RADR).
12.7.4 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
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 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 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 .
The trip value record is stored as a part of the disturbance report information
(LMBRFLO) and managed in PCM600 or via the local HMI.
12.7.5 Technical data
Table 231: DRPRDRE technical data
Function Value
Buffer capacity Maximum number of analog inputs 30
Maximum number of disturbance reports 100
1MRK 505 277-UUS C
Section 12
Monitoring
287
Technical Manual