Technical library

Insulation resistance measurement is one of the most widely used tests for power assets but, to achieve dependable results, it’s universally accepted that it’s essential to use a test set with a guard terminal. We look at why this is and examine the frequently neglected issue of guard terminal performance.

The new MFT1845 utilises a brand new loop impedance test technique which provides immunity to the increased impedance effects that RCDs and RCBOs can have on the measurement. Read more about it ...

Use where electrical noise affects the repeatability of measured values to the extent where it is difficult or impossible to get a reliable loop impedance value, or where a significant number of repeated measurements are required to provide a reasonable average.

Software download files for EasyProt

SVERKER Win Software For SVERKER 750/780

Download the latest LVI and GET catalogue of 36 pages, which details all Megger products designed for contractors working on low voltage systems.

BVM150The system consist of 16 BVM units. Power & Signal Connector. Power supply.16 pcs. Ethernet cables 0,5m. Ethernet cable 2m. USB extension cable 2 m. 16 pcs. Dolphin clips(15 pcs. Black, 1 pcs. red). Art no CJ-59092. 16 pcs. extension cable, Art no 04-30050. BVM300The system consist of 31 BVM units. Power & Signal Connector. Power supply. 31pcs. Ethernet cables 0,5m. Ethernet cable 2m. and 3m. USB extension cable 2m. 31 pcs. Dolphin clips (30 pcs. black, 1 pcs. red). Art no CJ-59093. 31 pcs. extension cable, Art no 04-30050. BVM600The system consist of 61 BVM units. 1pcs. Power & Signal Connector. Power supply. 61pcs. Ethernet cables 0,5m. Ethernet cable 2pcs. 2m and 2pcs. 3m. USB extension cable 2m. 61 pcs. Dolphin clips (60 pcs. black, 1 pcs. red). 2pcs. Art no CJ-59096. 61 pcs. extension cable, Art no 04-30050. BVM special 600 VThe system consist of 46 BVM units. 2 pcs. Power & Signal Connector. 2 pcs. ungrounded power supply. 46 pcs. Ethernet cables 0,5m. 2 pcs. USB extension cable. 2 pcs. Opto coupler. Dolphin clips (44 pcs. black, 2 pcs. red). Art no CJ-59198. 46 pcs. extension cable, Art no 04-30050.

For approximately 25 years, dielectric frequency response (DFR) has been investigated and proven to provide an accurate method of determining both the moisture condition of paper + oil power transformers and bushings. Together with general insulation testing, DFR provides enhanced insulation condition of the transformer under test.DFR testing method is now accepted internationally – as evidenced by its inclusion in the CIGRE TB445 as an accepted method for moisture determination. IEEE is presently in the process of completing a new guide for use of DFR in transformer moisture assessment for both factory and field testing, which should be completed and available by 2019. Instruments like the Megger IDAX300, which was the first commercially available unit to perform this test, is a valuable tool in this determination of moisture content.IDAX300 has included the ability to perform PF tests at frequencies from 1 to 500Hz which can be defined as a narrow frequency band dielectric frequency response test. We are now able to provide a shorter duration DFR test which gives us additional information into the overall insulation condition of the transformer or bushing.This paper illustrated a narrow band DFR test performed on a transformer located in Thailand – EGAT (power utility) and the result was recorded. It is proved that narrow band DFR test can provide a base line for any future testing comparison. We can use both a curve shape and/or a trend change for looking for issues. We no longer need to only rely on the line frequency PF(DF) to detect future issues.

Software update for 'A' models

PD Detector Software for MV DAC30, TDS NT, TDM 45, PDS 62