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REU 513
2.1.5.
2.1.5.1.
2.1.5.2.
2.1.5.3.
2.1.5.4.
34
User's Guide
Disturbance recorder
Function
The relay features an integrated disturbance recorder for recording monitored
quantities. The recorder captures continuously curve forms of the voltages as well
as the external binary input signal and states of the internal protection stages, 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 40 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 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 eight digital
channels for a period of 40 cycles. The analogue channels are the momentary
voltages measured by the relay, and the digital channels 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 the 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.
Writing the value 0 to the parameter clears the recorder memory, restarts storing of
new data into the memory and enables triggering of the recorder. Writing the value
2 to the parameter restarts the unloading process in the recorder by setting the time
stamp and first data ready to be read. Writing the value 4 to the parameter triggers
the recorder.
Triggering
Triggering the disturbance recorder for start of a new recording sequence is only
possible if the recorder is not already triggered (V246=0).
The recorder can be triggered either manually by writing the value 4 to parameter
V246 or it can be triggered by the rising or falling edge of the signals from the
internal protection stages and/or the binary input signal. Triggering on the rising
edge means that the recording sequence starts when the signal is activated.
ABB Substation Automation
Products and Systems
1MRS750886-MUM
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