Function Block; Signals; Settings; Operation Principle - Hitachi Relion 650 Series Technical Manual

Section 12
Monitoring
12.9.2

Function block

The Disturbance recorder has no function block of its own.
12.9.3

Signals

See Disturbance report for input and output signals.
12.9.4

Settings

See Disturbance report for settings.
12.9.5

Operation principle

Disturbance recording is based on the acquisition of binary and analog signals. The binary signals
can be either true binary input signals or internal logical signals generated by the functions in the
IED. The analog signals to be recorded are input channels from the Transformer Input Module (TRM)
or digital Merging Units (MU) through the Signal Matrix Analog Input (SMAI) and some internally
derived analog signals.
Disturbance recorder collects analog values and binary signals continuously, in a cyclic buffer. The
pre-fault buffer operates according to the FIFO principle; old data will continuously be overwritten as
new data arrives when the buffer is full. The size of this buffer is determined by the set pre-fault
recording time.
Upon detection of a fault condition (triggering), the disturbance is time tagged and the data storage
continues in a post-fault buffer. The storage process continues as long as the fault condition prevails
- plus a certain additional time. This is called the post-fault time and it can be set in the disturbance
report.
The above mentioned two parts form a disturbance recording. The whole memory, intended for
disturbance recordings, acts as a cyclic buffer and when it is full, the oldest recording is overwritten.
Up to the last 200 recordings are stored in the IED.
The time tagging refers to the activation of the trigger that starts the disturbance recording. A
recording can be trigged manually, by a binary input and/or from analog inputs (over-/underlevel trig).
A user-defined name for each of the signals can be set. These names are common for all functions
within the disturbance report functionality.
12.9.5.1

Memory and storage

When a recording is completed, a post-recording processing occurs.
This post-recording processing comprises:
214
The maximum number of records depends on each record's total recording time.
Long recording time will reduce the number of recordings to less than 200.
The IED flash disk should NOT be used to store any user files. This might cause
disturbance recordings to be deleted due to lack of disk space.
© 2021 Hitachi Energy. All rights reserved.
1MRK 511 557-UEN Rev. A
D0E7890T201305151403 v2
D0E7892T201305151403 v1
D0E7891T201305151403 v1
D0E7531T201305151403 v1
D0E7568T201305151403 v3
D0E7569T201305151403 v4
Technical Manual