Disturbance Recorder - GE MiCOM P40 Agile Technical Manual

Chapter 14 - Monitoring and Control P14D
3

DISTURBANCE RECORDER

The disturbance recorder feature allows you to record selected current and voltage inputs to the protection
elements, together with selected digital signals. The digital signals may be inputs, outputs, or internal DDB signals.
The disturbance records can be extracted using the disturbance record viewer in the settings application software.
The disturbance record file can also be stored in the COMTRADE format. This allows the use of other packages to
view the recorded data.
The integral disturbance recorder has an area of memory specifically set aside for storing disturbance records. The
number of records that can be stored is dependent on the recording duration. The minimum duration is 0.1 s and
the maximum duration is 10.5 s.
When the available memory is exhausted, the oldest records are overwritten by the newest ones.
Each disturbance record consists of a number of analogue data channels and digital data channels. The relevant
CT and VT ratios for the analogue channels are also extracted to enable scaling to primary quantities.
The fault recording times are set by a combination of the Duration and Trigger Position cells. The Duration cell
sets the overall recording time and the Trigger Position cell sets the trigger point as a percentage of the duration.
For example, the default settings show that the overall recording time is set to 1.5 s with the trigger point being at
33.3% of this, giving 0.5 s pre-fault and 1 s post fault recording times.
With the Trigger Mode set to Single, if further triggers occurs whilst a recording is taking place, the recorder will
ignore the trigger. However, with the Trigger Mode set to Extended, the post trigger timer will be reset to zero,
extending the recording time.
You can select any of the IED's analogue inputs as analogue channels to be recorded. You can also map any of the
opto-inputs output contacts to the digital channels. In addition, you may also map a number of DDB signals such
as Starts and LEDs to digital channels.
You may choose any of the digital channels to trigger the disturbance recorder on either a low to high or a high to
low transition, via the Input Trigger cell. The default settings are such that any dedicated trip output contacts will
trigger the recorder.
It is not possible to view the disturbance records locally via the front panel LCD. You must extract these using
suitable setting application software such as MiCOM S1 Agile.
288 P14D-TM-EN-8