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Mehta, Dipak
- Quantitative Analysis Ageing Status of Insulation of High Voltage Motors by Polarization – Depolarization Current Measurements
Abstract Views :177 |
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Authors
Tapan M. Rami
1,
Dipak Mehta
2
Affiliations
1 Manager, Essar Oil Ltd., Refi nery Site, 39 KM, Jamnagar-Okha Highway, Vadinar - 361305, Gujarat, IN
2 Manager, Electrical Dept, Essar Oil Ltd., Refi nery Site, 39 KM, Jamngar–Okha Highway, Vadinar - 361305, Gujarat, IN
1 Manager, Essar Oil Ltd., Refi nery Site, 39 KM, Jamnagar-Okha Highway, Vadinar - 361305, Gujarat, IN
2 Manager, Electrical Dept, Essar Oil Ltd., Refi nery Site, 39 KM, Jamngar–Okha Highway, Vadinar - 361305, Gujarat, IN
Source
Power Research, Vol 9, No 1 (2013), Pagination: 157–162Abstract
Polarization and depolarization current (PDC) technique is an effective tool to assess the condition of insulation system in high voltage motors So far the PDC behaviors of insulation have been widely investigated. This Paper presents the assessment of insulation systems for high voltage induction motor through measurement of polarization depolarization current or charging and discharging current. However, with the increasing number of Motors choosing insulation , it is important to investigate the PDC characteristics of insulation to see whether the PDC technique can also be used to assess the condition of new insulation system using PDC accurately It is considered that the insulation systems are having different types and conditions of insulation aging. It demonstrates that the insulation resistance (IR) and polarization index (PI) can’t be used individually to judge insulation dryness and the combination of insulation resistance and PI. PDC analysis is better technique of insulation quality assessment than the insulation resistance alone. The PDC analysis is non destructive dielectric testing method for determining the conductivity and moisture content of insulation materials in high voltage motors. On the basis of this analysis, it is possible to take further actions like overhauling, drying process, and replacement of the winding of the motor. This paper also presents a description of PDC analysis technique with the practically and theoretical background and some results of PDC measurements on High voltage motor duration from 0–600 days.Keywords
Insulation system, Insulation resistance (IR), Polarization index (PI), Polarization and depolarization current (PDC), Charge storage mechanisms and Aging- Analysis of Transformer Insulation by Tan Delta Testing Method
Abstract Views :193 |
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Authors
Affiliations
1 Manager, Electrical dept, Essar Oil Ltd., Refi nery Site, 39 KM, Jamngar–Okha Highway, Vadinar-361305, Gujarat, IN
2 Associate Prof., Department of Electrical Engineering, SVNIT, Surat, Gujarat, IN
1 Manager, Electrical dept, Essar Oil Ltd., Refi nery Site, 39 KM, Jamngar–Okha Highway, Vadinar-361305, Gujarat, IN
2 Associate Prof., Department of Electrical Engineering, SVNIT, Surat, Gujarat, IN
Source
Power Research, Vol 8, No 1 (2012), Pagination: 31–40Abstract
This paper presents analysis of power transformer insulation by one fundamental insulation power factor test, also known as Tan Delta. It is a routine test conducted at site to know the healthiness of insulation in transformers. Out of 108 transformers tested for research work, case studies were chosen for analysis purpose. Experimental data shows our experience on the measurement of Tan Delta techniques of earthing systems and dryness of insulation in transformers. Result shows that the Tan Delta testing method is very effi cient method.- Basics of Dissolved Gas analysis and Case studies for Power Transformers
Abstract Views :195 |
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Authors
Affiliations
1 Electrical Dept, Essar Oil Ltd., Refi nery Site, 39 KM, Jamnagar – Okha Highway, Vadinar-361305, Gujarat, IN
2 Electrical Dept., SVNIT, Ichchhanath, Surat-395007, Gujarat, IN
1 Electrical Dept, Essar Oil Ltd., Refi nery Site, 39 KM, Jamnagar – Okha Highway, Vadinar-361305, Gujarat, IN
2 Electrical Dept., SVNIT, Ichchhanath, Surat-395007, Gujarat, IN