Operation Principle; Technical Data; Disturbance Recorder; Functionality - Hitachi Relion 650 Series Technical Manual

1MRK 511 557-UEN Rev. A
12.8.4

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 defines 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 signal that appears in the Trip value recorder function is the user-defined
name assigned to the corresponding input of the AxRADR function. 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 can be viewed in
PCM600 or via the local HMI.
12.8.5

Technical data

Table 219: DRPRDRE technical data
Function
Buffer capacity
12.9

Disturbance recorder

12.9.1

Functionality

The Disturbance recorder function supplies fast, complete and reliable information about
disturbances in the power system. It facilitates understanding system behavior and related primary
and secondary equipment during and after a disturbance. Recorded information is used for different
purposes in the short perspective (for example corrective actions) and long perspective (for example
functional analysis).
The Disturbance recorder acquires sampled data from selected analog and binary signals connected
to the Disturbance recorder function (maximum 40 analog and 96 binary signals). The binary signals
available are the same as for the event recorder function.
The function is characterized by great flexibility and is not dependent on the operation of protection
functions. It can record disturbances not detected by protection functions. Up to 9,9 seconds of data
before the trigger instant can be saved in the disturbance file.
The disturbance recorder information for up to 200 disturbances are saved in the IED and the local
HMI is used to view the list of recordings.
Technical Manual
Maximum number of analog inputs
Maximum number of disturbance reports
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Section 12
Monitoring
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