Voltage Fluctuation Table (Vft) File - Novatech Bitronics M87X Series Manual

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5.4.6 Voltage Fluctuation Table (VFT) File

The 70 Series IEDs are capable of creating a VFT file, which is used in conjunction with an
external software package for monitoring Sags and Swells.
The raw data for each voltage channel is derived from 1 cycle RMS values that are
updated each quarter cycle.
Each table contains one bus of voltages, phases A, B, & C
For units that have two buses of volts, two separate tables will be created. This currently
includes M871, M571, M872 Breaker & a Half, and M572 Breaker & a Half.
Reference voltages will not be recorded in the table; therefore the M872 Dual Feeder &
M572 Dual Feeder will only have 1 table.
The 70 series will maintain the minimum and maximum value for each voltage channel.
When the voltage for a channel crosses a user configured threshold an entry will be made
in the table. The user can configure up to 30 thresholds but a minimum of 3 thresholds
must be configured. The default configuration for the thresholds are:
- 110% of Nominal
- 90% of Nominal
- 1% of Nominal
A fixed value of 1% of nominal will be used for the hysteresis.
For Dips & Interruptions, the threshold is passed going down on the value the user
ML0021 August 15, 2018
Limited to 64 characters
Such as DR1_0010 or
WR2_0003
65
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