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REJ 523
4.1.6
4.1.7
4.1.7.1
4.1.7.2
4.1.7.3
32
Technical Reference Manual
I/O test
The state of the binary input can be monitored and the five logical outputs can be
activated and tested one by one. The test mode is entered via "Function test/BI" in
MMI menu. Refer to "Operator's Manual".
Disturbance recorder
Function
The relay features an integrated disturbance recorder for recording monitored
quantities. The recorder captures continuously the curve forms of the currents, as well
as both the internal signals and the external binary input signal, and stores these to the
volatile memory.
When the recorder is triggered, the post-triggering recording starts. If the post-
triggering recording length has been defined to be less than the total recording length
of 38 cycles, a part of the history recording, preceding the triggering, also remains in
the memory to fill the total recording length. When the post-triggering recording has
finished, a complete recording has been created and stored in the memory.
As soon as the recorder has been triggered and the recording has finished, the
recording can be unloaded and verified by means of a personal computer with a
special program.
Recorder data
One recording contains the information of three analogue channels and five digital
channels for a period of 38 cycles. The analogue channels are the currents measured
by the relay, and the digital channels, referred to as digital signals, are the operating
signals of the protection stages and the external binary input signal linked to the relay.
The sampling frequency is 16 times the rated frequency, resulting in 800 Hz at 50 Hz
rated frequency and in 960 Hz at 60 Hz rated frequency. At a power reset or reset of
recorded values (WV102:1) the contents of the recorder memory are lost.
Control and indication of recorder status
It is possible to control and monitor the indicated status of the disturbance recorder by
writing to and reading from parameter V246. Reading the parameter returns either the
value 0 or 1, indicating whether the recorder is not triggered, or triggered and ready to
be unloaded.
ABB Substation Automation
Products and Systems
MRS750940-MUM
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