An online method for the assessment of moisture in a power transformer is presented in this paper. It is experimentally tested on simple insulating materials as well as on a sample bushing insulation. It is finally tested during the drying of a 110 kV transformer. The results are presented and show that the method is clearly able to distinguish between levels of moisture in the range of interest. © 2010 IEEE.

V. Jayashankar

V. Jagadeesh Kumar

BUSHING INSULATION

FREQUENCY DOMAIN SPECTROSCOPY

ON-LINE ASSESSMENT

ON-LINE MEASUREMENT

ONLINE METHODS

Building materials

Frequency domain analysis

Insulation

Moisture

Rating

TRANSFORMER SUBSTATIONS

Power transformers

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IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

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IIT Madras

On-line assessment of moisture in a power transformer

AMPS 2010 - 2010 IEEE International Conference on Applied Measurements for Power Systems, Proceedings

Dielectric measurements have been used for long time for assessment of electrical insulation. The insulation system of a power transformer consists of oil and cellulose, whose dielectric properties are strongly influenced by moisture, temperature and ageing. This condition can therefore be evaluated using the response of the dielectric system. In this work we utilize data published to establish a circuit model of power transformer. Analysis techniques are then suggested in order to simplify the testing procedure for moisture in bulk insulation.

Proceedings of the International Symposium on Electrical Insulating Materials

Evaluation of the moisture content in power transformer

IEEE Electrical Insulation Magazine

Applications of dielectric spectroscopy in time and frequency domain for HV power equipment

IEEE Transactions on Dielectrics and Electrical Insulation

Review of modern diagnostic techniques for assessing insulation condition in aged transformers

IEEE Transactions on Electrical Insulation

Degradation of electrical insulating paper monitored with high performance liquid chromatography

Figure 4—figure supplement 3. Vertex model simulations for cell shapes during KV remodeling (N = 12).

Journal	AMPS 2010 - 2010 IEEE International Conference on Applied Measurements for Power Systems, Proceedings
Open Access	No