Disturbance Recorder - ABB REF615 Applications Manual

Section 9
Measurement functions
9.2
9.2.1
9.2.2
208
The limit supervision indicates, if the measured signal exceeds or goes below the set
limits. Depending on the measured signal type, up to two high limits and up to two
low limits can be set for the limit supervision
The deadband supervision reports a new measurement value if the input signal has
gone out of the deadband state. The deadband supervision can be used in value
reporting between the measurement point and operation control. When the deadband
supervision is properly configured, it helps in keeping the communication load in
minimum and yet measurement values are reported frequently enough.

Disturbance recorder

Functionality
The IED is provided with a disturbance recorder featuring up to 12 analog and 64
binary signal channels. The analog channels can be set to record either the waveform
or the trend of the currents and voltage measured.
The analog channels can be set to trigger the recording function when the measured
value falls below or exceeds the set values. The binary signal channels can be set to
start a recording on the rising or the falling edge of the binary signal or both.
By default, the binary channels are set to record external or internal IED signals, for
example the start or trip signals of the IED stages, or external blocking or control
signals. Binary IED signals such as a protection start or trip signal, or an external IED
control signal over a binary input can be set to trigger the recording.
The recorded information is stored in a non-volatile memory and can be uploaded for
subsequent fault analysis.
Application
The disturbance recorder is used for post-fault analysis and for verifying the correct
operation of protection IEDs and circuit breakers. It can record both analog and binary
signal information. The analog inputs are recorded as instantaneous values and
converted to primary peak value units when the IED converts the recordings to the
COMTRADE format.
COMTRADE is the general standard format used in storing
disturbance recordings.
The binary channels are sampled once per task execution of the disturbance recorder.
The task execution interval for the disturbance recorder is the same as for the
protection functions. During the COMTRADE conversion, the digital status values
are repeated so that the sampling frequencies of the analog and binary channels
correspond to each other. This is required by the COMTRADE standard.
1MRS756378 D
REF615
Application Manual