[en] Electrical power system of the Reactor Research Centre at Kalpakkam is described. Spares and maintenance problems have been minimised by standardization of critical equipment like circuit breakers, station batteries, motors and motor-controls. For a trouble free power supply to the Fast Breeder Test Reactor and the Radioactive Laboratories, the power system has been adequately protected; preventive maintenance programme for each equipment has been drawn. Maintenance schedule for two typical equipments, namely, 200 A-H 110V station battery and 20 MVA, 33/11 KV, ON 103 transformer are given. Maintenance problems which came up with cable joints, switchgears, control and protective circuits, station batteries and transformers are discussed. It is also described how these problems were solved. (M.G.B.)

[en] The Class 3 system is a basic requirement in all nuclear installations. Selection of this major equipment plays an important role in the overall performance and reliability of the whole system. The paper deals with the choice of alternator, rating, its auxiliaries along with control and protection requirements. (author). 3 refs., 4 figs

[en] The class 3 system is a basic requirement in all nuclear installations. Selection of this major equipment and associated auxiliaries plays an important role in the overall performance and reliability of the whole system. This paper deals with various sub-systems of class 3 power like engine, alternator, auxiliaries. It deals with method of arriving at capacity of sets based on connected loads, starting requirement and choice of engine based on site conditions, fuel used, duty, speed, mean effective pressures, typical layout of set and auxiliaries with its various sub-systems. Various engine starting methods, advantages and disadvantages, area requirements, choice of foundation, general guidlines for installation, testing and commissioning of medium size plant will be discussed in reference to applicable codes and practices. (author). 3 refs., 1 fig