Selection of Size for Hydropower Distribution Boxes
Hydropower distribution boxes are typically constructed with durable materials, rated IP55–IP65, and designed to house busbars, isolators, and outgoing feeders with precise dimensions and electrical specifications.
Material and Construction
Hydropower distribution boxes are generally made from PC or ABS engineering plastics for waterproof versions or 2 mm GI sheet steel for outdoor LT boxes . Plastic boxes often feature halogen-free materials with UV protection for outdoor use, while steel boxes are reinforced with channels for mechanical strength and durability . Doors are equipped with hinges, overhangs, and locking systems (e.g., Godrej 3-position locks) to ensure security and weather resistance .
Protection Ratings
- IP65: Common for waterproof plastic boxes, providing dust-tight and water jet protection .
- IP55: Typical for outdoor steel LT distribution boxes, offering protection against dust and low-pressure water jets .
- IK10: Impact resistance rating for robust enclosures .
Dimensions and Module Capacity
- Plastic distribution boxes are available in 4–54 module capacities, with single, double, or triple layers .
- Steel LT boxes are designed according to KVA ratings (e.g., 63, 100, 160, 315 KVA) with sufficient internal space for busbars, isolators, and outgoing feeders .
- Busbar dimensions vary by capacity:
- 63/100 KVA: 72×50×8 mm
- 160/315 KVA: 120×50×15 mm
- Feeders and incomer droppers are sized accordingly, e.g., 50×8 mm for 63/100 KVA and 50×15 mm for 160/315 KVA .
Electrical Components
- Isolators: Switch disconnectors conforming to IS:13411, with arc-chutes to extinguish arcs and handles of minimum 300 mm length .
- Porcelain cutouts: Used in higher KVA boxes (160/315 KVA) to protect outgoing circuits .
- Busbars and droppers: Made of EC grade aluminum, properly insulated with PVC sleeves and drilled for secure connections .
- MCCBs: Provision for 4-pole MCCB for incoming and 3-pole MCCB for outgoing feeders in LT boxes .
Design Features
- Slanted roofs with overhangs to prevent water ingress .
- Transparent windows in plastic boxes for monitoring modules .
- Symmetrical TH35×7.5 rails for mounting modules .
- Adequate clearance inside the box to comply with IEC and local electrical safety rules .
- Earthing points on both sides for safety .
Standards Compliance
- IEC 60529, IEC 62262, IEC 60695-2-10 for plastic boxes .
- IS:13411 for isolators .
- Low Tension Directive 2014/35/EU for module enclosures .
- Type test certificates from approved laboratories (e.g., CPRI) are required for IP rating verification . These specifications ensure that hydropower distribution boxes provide reliable electrical protection, mechanical strength, and environmental resistance, suitable for industrial, commercial, and hydropower applications.
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