ABB REM 610, Техническое справочное руководство

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5.1.10.2. 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 measured by the relay. The digital channels,
referred to as digital signals, are pickup and trip signals from the protection elements
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 5.1.15.-5 and Table 5.1.15.-6.
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 5.1.10.2.-1 Sampling frequency
Nominal frequency Hz Sampling frequency Hz Cycles
50 800 250
400 500
50
a)
4000
60 960 250
480 500
60
a)
4000
a)
RMS curve.
Recording length:
s =
Cycles
Nominal frequency [Hz]
[ ]
(4)
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.
Triggering of the recorder immediately after it has been cleared or the auxiliary
voltage connected may result in a shortened total recording length. Disconnection of
the auxiliary voltage after the recorder has been triggered, but before the recording
has finished, on the other hand, may result in a shortened post-triggering recording
length. This, however, does not affect the total recording length.
66
REM 610 REM 610 Motor Protection Relay
Technical Reference Manual - ANSI Version
1MRS755537