Signals - ABB Relion Technical Manual

1MRK 502 048-UUS A
14.8.3
14.8.3.1
14.8.4
14.8.5
Technical manual

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 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 and managed
in PCM600 or via the local HMI.
Technical data
Table 402: DRPRDRE technical data
Function
Buffer capacity Maximum number of analog inputs
Maximum number of disturbance reports
Section 14
Monitoring
Value
30
100
581