Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
The structure of pole mounted substation is
H - type
I - type
type
T - type
H - type
A pole-mounted substation is an outdoor distribution transformer installation mounted on either a single pole or an H-type structure. The H-type structure consists of two poles braced together to provide the necessary mechanical strength and space required for mounting heavy transformers and associated protective equipment like DO fuse cutouts and lightning arresters.
A pole-mounted substation is an outdoor distribution transformer installation mounted on either a single pole or an H-type structure. The H-type structure consists of two poles braced together to provide the necessary mechanical strength and space required for mounting heavy transformers and associated protective equipment like DO fuse cutouts and lightning arresters.
FtotalтАЛ=WtransтАЛ+TlinesтАЛ тАФ Total mechanical load supported by the H-structure including transformer weight and line tension
The structure acts as a rigid platform for electrical hardware. The two poles are joined by cross-members, effectively distributing the mechanical stress of the transformer weight and the tension of incoming/outgoing overhead lines. This configuration ensures proper ground clearance and maintenance access, complying with safety regulations for distribution networks.
Used for distribution transformers up to 250 kVA capacity.
Employs two wooden, steel, or PSC (Prestressed Concrete) poles.
Provides physical stability against wind loads and line tension.
Standard height ensures safe ground clearance for the bottom of the transformer.
High mechanical strength for heavy equipment
Cost-effective for rural distribution
Easy installation and maintenance access
Requires more ground space than single-pole mounts
Vulnerable to environmental factors (corrosion/weathering of poles)
Rural and urban distribution networks
Industrial localized power supply
The poles in an H-structure are typically spaced 1.5 to 2 meters apart.
Option B (I-type) is used for single-pole mounting (typically < 100 kVA).
Safety standards often mandate specific horizontal and vertical clearances from nearby buildings.
A is correct тАФ The H-type structure is the standard arrangement for supporting heavier distribution transformer assemblies in pole-mounted substations.
Always remember that for larger transformer sizes, the H-pole design is mandatory to prevent mechanical fatigue and ensure structural integrity against line tension.