Moisture Analysis on Instrument Transformers

Moisture in the solid part of the paper insulation is one of the most important factors that impact the condition of instrument transformers. The ingress of moisture from the atmosphere during installation or repairs can easily occur. Over time, increasing moisture content causes the aging of the oil-paper insulation.

Moisture in oil-paper insulation can reduce the dielectric strength or accelerate the aging of the cellulose (so-called depolymerization) and lead to eventual failure.

Therefore, determining the moisture content in the insulation is an important measure to ensure the reliability and lifetime of current and voltage transformers. Since it can be problematic to take oil samples from instrument transformers, which can lead to rather inexact measurement results, our testing systems use dielectric measurements for moisture determination.

Expert recommends

DIRANA + PTM: Moisture determination of oil-paper insulated instrument transformers

DIRANA uses dielectric frequency response (DFR) analysis in order to determine the condition of high-voltage insulation systems such as those in power transformers, bushings, cables and generators.

It automatically analyses and determines the water content and the oil conductivity in different types of cellulose insulation. You can test assets filled with mineral oil, natural and synthetic ester as well as air or vacuum. The measurement results are shown in categories defined by IEC 60422.

DIRANA
FDS-PDC+ dielectric insulation analyzer
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Primary Test Manager (PTM)
Diagnostic testing, condition assessment and data management of medium and high-voltage assets
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Benefits of this solution

Moisture determination

Moisture leads to a reduced breakdown strength of the oil and an accelerated aging of the cellulose insulation. The determination of moisture is vital for evaluating the remaining lifespan of your transformer.

Combined advantages

DIRANA combines advanced time domain spectroscopy (PDC+) with frequency domain method spectroscopy (FDS). As well as the moisture content of the transformer, DIRANA also determines oil conductivity, dissipation/power factor and capacitance.

Software support using PTM

DIRANA operates with the Primary Test Manager ™ (PTM) software: The easy to use software determines all relevant parameters, provides automatic analysis and requires no expert knowledge.

Easy and comfortable testing

With DIRANA you get all the required components in just one box, which makes it easy to transport (19 kg/ 42 lbs). Its simple wiring concept and clamps with integrated guard connections make setting up tests easy and fast.

Literature
Instrument-Transformer-Testing-Brochure-ENU.pdf (2 MB)
Optimized-substation-asset-testing-brochure-ENU.pdf (14 MB)
DIRANA-Brochure-ENU.pdf (1 MB)
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Videos

What is Dielectric Response Analysis?

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