(1) All the equipment is within view and therefore fault location is easier.
(2) The extension of the installation is easier if required.
(3) The time required in erection of such substations is lesser.
(4) The smaller amount of building materials (steel concrete) is required.
(5) The construction work required is comparatively smaller and cost of the switchgear installation is low.
(6) There is practically no danger of a fault which appears at one point being carried over to another point in the installation because the apparatus of the adjoining connections can be spaced liberally, without any appreciable increase in costs. Disadvantages The disadvantages of outdoor installations are comparison of indoor installations are:
i. The various switching operations with the isolators, as well as supervision and m maintenance of the apparatus is to be performed in the open air during all kinds of weather.
ii. More space is required for the substation.
iii. The influence of rapid fluctuation in ambient temperature ad dust and dirt deposits upon the outdoor substation equipment makes it necessary to install apparatus specially designed for outdoor service and, therefore, more costly.
Not-withstanding the disadvantages, outdoor substations are very widely used in power system.
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