Disturbance Recorder Data; Sampling Frequency - ABB REF610 Technical Reference Manual

REF610 REF610
5.1.11.2.
78
Feeder Protection Relay
Technical Reference Manual - ANSI Version
As soon as the recorder has been triggered and the recording has finished, the
recording can be uploaded and analyzed by means of a PC provided with a special
program.

Disturbance recorder data

One recording contains data from the four analog channels and up to eight digital
channels. The analog channels, whose data is stored either as RMS curves or as
instantaneous measured values, are the currents measured by the relay. The digital
channels, referred to as digital signals, are pickup and trip signals from the
protection elements , the alarm signal from element 49, the signals from the auto-
reclose function and the digital input signals linked to the relay.
The user can select up to eight digital signals to be recorded. If more than eight
signals are selected, the first eight signals are stored, beginning with the internal
signals followed by the digital input signals.
The digital signals to be stored are selected with parameters V238 and V243; see
Table 5.1.17.-6 and Table 5.1.17.-7.
The recording length varies according to the selected sampling frequency. The RMS
curve is recorded by selecting the sampling frequency to be the same as the nominal
frequency of the relay. The sampling frequency is selected with SPA parameter M15;
see the table below for details.
Table 5.1.11.2.-1

Sampling frequency

Nominal frequency Hz
50
60
a)
RMS curve.
Recording length:
Cycles
[ ]
s =
Nominal frequency [Hz]
Changing the setting values of parameters M15, V238 and V243 is allowed only
when the recorder is not triggered.
The post-triggering recording length defines the time during which the recorder
continues to store data after it has been triggered. The length can be changed with
SPA parameter V240. If the post-triggering recording length is defined to be the
same as the total recording length, no data stored prior to the triggering is retained in
the memory. By the time the post-triggering recording finishes, a complete
recording is created.
Sampling frequency Hz
800
400
a)
50
960
480
a)
60
1MRS755535
Cycles
250
500
4000
250
500
4000
(9)