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Abhay Kumar Khairwar ¹, Venkateswarlu G. ¹, Mondal N. R. ¹, Raghavaiah B. V. ¹

Affiliations
1 Operation and Maintenance Division, Switchgear Testing and Development Station, Central Power Research Institute, Bhopal-462023, IN

Abstract

Short circuit generators are used to deliver the short circuit power in testing laboratories. During operation at the time of field excitation a large amount of heat is generated. The dissipation of this heat has to be evacuated to improve the generator efficiency and its reliability. The generator cooling goals are to minimize drag or Windage loss, keep generator internals clean, minimize electrical, mechanical and corrosion problems, and maximize generator output

The purpose of the cooling is to dissipate generator thermal losses by forced circulation of coolant, may be gas, water or air in a closed circuit through the different parts of the generator. This paper explains the methodologies adopted to cool down the electrical machines like generators and to provide the safe working atmosphere to the personnel’s working around it and also emphasizes on challenges to handle the gas cooling system compared to the normal air cooling system. In this paper the actual cooling system is also addressed, used in 1500 MVA Short Circuit Generator.

Keywords

TEWAC System, OV System, Purging, Joule Heating, TNT.

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Venkateswarlu G. ¹, Mondal N. R. ¹, Ansari M. A. ¹, Raghavaiah B. V. ¹

Affiliations
1 Operation and Maintenance Division, Switchgear Testing and Development Station, Central Power Research Institute, Bhopal - 462 023, IN

Abstract

A vast majority of electrical loads in short circuit testing plants are inductive rapidly varying in nature. Typical examples are motors, transformers, drives etc. Such loads consume high reactive power in short durations. Load requirement of the short circuit plant is intermittent in nature due to varieties of customer tests. Hence controlling of reactive power of these types of loads is a challenge. It is therefore necessary to reduce and manage the fl ow of reactive power to achieve higher efficiency of the short circuit plant and reduction in cost of electricity consumed. An improvement of the reactive power management of an installation presents several technical and economic advantages, notably in the reduction of electricity charges. This paper discusses a cost effective method of reducing and managing reactive power. It has been shown that the installed reactive power compensating devices captured both the technical and economic aspects of short circuit plant operation in competitive electricity markets. Also it has been shown that traditional techniques are economically viable if they are used in a judicious manner.

Keywords

Displacement P.F., Distortion P.F., Energy conservation and Reactive power management

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