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Before data is stored to the database, averages are calculated ¨C ignoring extreme values (basic filtering). A standard filter is also applied to the tan (d) values being stored in the database. Technical experts can adjust the filter factor.
All data is 'continuously' analyzed according to a user definable frequency (in hours). The evaluation of the data is based on a comparison of measured values with historical data for each particular unit.
From the analysis, the software calculates an "absolute" condition value for every unit in service. These values range from 0 (good) to 100+ (bad). Simple "green, yellow, red" indications of the condition of equipment are given based on these condition values.
Specification
• One capacitive divider unit (CDU) for each test point
• One measurement tap unit (MTU) for three CDUs
• Junction Box
• Front-end Processing Box with
-- Input conditioning board
-- Rendezvous board
-- Watchdog board
-- Alarm board
• 32, 64, 128 Test Points (input channels)
-- Nominal signal level: 40Vrms, 50/60Hz
-- Isolation between inputs: 3000V
-- Surge withstand capabilities: ANSI/IEEE C37.90.1-1989
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Bushings Insulation Monitoring Module