Power Research

Dillip Kumar Puhan ¹, Rajat Sharma ¹, Thirumurthy ¹, K. P. Meena ¹

Affiliations
1 Cables and Diagnostics Division, Central Power Research Institute, Bangalore – 560080, Karnataka, IN

Abstract

A huge capital investment goes for power cables in an electric power system. Reliability and life expectancy of serviceaged power cables can be assured by systematic field testing and condition assessment program. Very Low Frequency (VLF) ac Testing proved effective for field testing and condition assessment of shielded Power Cable System. Central Power Research Institute (CPRI), Bengaluru, a premier institute for Indian Power Sector has been conducting diagnostic testing on medium voltage power cable systems to assess the healthiness of the power cable systems and cable system components. In this paper application of VLF testing for withstand and other diagnostic tests and measurements are discussed. Few case studies based on the data obtained from the field testing on MV Power Cable System are presented.

Keywords

Very Low Frequency (VLF), VLF Dielectric Spectroscopy (VLF-DS), VLF Differential Tangent Delta (VLF-DTD), VLF Monitored Withstand Test (VLF-MW), VLF Partial Discharge (VLF-PD),VLF Tangent Delta (VLF-TD), VLF Tangent Delta Temporal Stability (VLF-TDTS).

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R. Arunjothi ¹, Thirumurthy ¹, K. P. Meena ¹

Affiliations
1 Central Power Research Institute, Bangalore - 560080, Karnataka, IN

Abstract

Fire Resistant cables are designed to maintain the circuit integrity of the cable even during fire conditions. In general, the fire-resistant cables are made up of flame retardant zero halogen materials, so that the fire hazard such as flame propagation and smoke release of these cables are controlled. However, one more fire hazard of these fire-resistant cables is nothing but the heat released from these cables during a fire. Heat release of these cables depends upon the fuel loading of the cables and the energy available in the materials of these Fire Resistant or Fire Survival (FS) cables. In this paper, the heat release of FS cables is measured for various construction of the FS cables.

Keywords

Fire Resistant Cables, Glass-Mica Insulation, Heat Release, Silicone Insulation.

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K. P. Meena ¹, Thirumurthy ¹, G. K. Raja ¹, R. Arunjothi ¹, P. V. Satheeshkumar ¹

Affiliations
1 Central Power Research Institute, Bengaluru – 560080, Karnataka, IN

Abstract

With the development of XLPE cables and associated accessories up to 500 kV voltage level, XLPE Cable Systems are becoming the main back bone of the Power Distribution and Transmission system. The basic requirement of power cable is that it shall withstand the electrical, thermal, mechanical and environmental stresses imposed on it during its expected life of 25 to 35 years. Generally the development of cable for EHV applications is achieved through increased stress design, which demands very stringent quality requirements during production of cables and development of accessories. Since different designs are available for cables and accessories, it is essential to carry out long duration test to establish their compatibility and reliability. IEC 62067 for extra High voltage Cable accessories have incorporated the pre-qualification tests to check the long term reliability of the cable system in service before installation. This paper highlights the details of Pre qualification test on 220 KV Cable system conducted at CPRI for the first time in India.

Keywords

EHV XLPE Cable, Electrical Stresses, Mechanical Stresses, Pre Qualification Test, Thermal Stresses

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