Illumination

•          Illumination for substation is an important requirement for making operation possible at night.

•          Scope of illumination for typical substation are:

–        Outdoor Switchyard

–        Control Room building

–        Auxiliary building

–        Street Lighting (service road within the switchyard)

•          Lighting system for substation are considered as:

–        Normal AC to cater lighting requirement during normal operating condition

–        Emergency lighting on failure of normal AC lighting source

•          DC emergency for illuminating strategic locations

•          Lighting from DG system for bigger substations

How much illumination level required for substation?

•          Lighting shall provide enough light depending on nature of work to be carried out. Operational lighting as per IS:3646 part-III.

What are the typical luminaries used in substation?

•          Luminaries for outdoor switchyard:

–        High Pressure Sodium Vapour (HPSV) luminaries with various combination of rating with high beam & narrow beam used to achieve desired illumination

–        Ratings usually considered

•          2X400W HPSV, 1X400W HPSV for switchyard and outdoor equipment

•          2X250W HPSV, 1X250W HPSV for switchyard and outdoor equipment

•          1X150W HPSV for street lighting

–        High Pressure Mercury Vapour / Halogen luminaries are also taken if they specifically required by customer

Luminaries for control room:

–        Indoor illumination is achieved by various types of luminaries according to the requirement and utility of various rooms.

–        Room with CP/RP,  office, conference room with air conditioning and false ceiling are provided with recessed mounted 2X36W fluorescent lamp with mirror optic reflector.

–        For LT room, DG, Store etc. where no false ceiling or AC provided, industrial type 2x36W fluorescent lamp is used.

–        For cable cellar bulk head or industrial type 2x36W fluorescent lamp is used as per specification.

–        Battery room is provided with corrosion proof industrial type 2X36W fluorescent lamp.

–        For DC emergency bulk head incandescent lamps are used.

Input requirement

–        Lux level to be achieved at what height

–        Size of the area for outdoor and dimension of the room.

–        Type of interior color in case of room

Design Calculation

–        Lighting design calculation are normally carried out by the manufacturer with their in-house software.

–        Calculation provides point by point illumination level by which total area illumination can be analysed.