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Box Substation

The box-type substation (also called prefabricated substation) is an integrated and modular distribution equipment, which combines high-voltage switchgear, transformers, low-voltage distribution devices, etc. in a closed or semi-closed box. It is widely used in power distribution and voltage conversion in power systems.

Classification:

Compact substation

European style Box Substation

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Field of application

Residence

Industry and commerce

Energy Storage

Photovoltaic power generation

Metal melting

State Grid

Product Introduction

Structure

Box-type substations are usually divided into three parts, with a modular design:
•High-voltage room
Equipped with high-voltage switchgear (such as load switches, fuses, lightning arresters, etc.), responsible for receiving 10kV or 35kV high-voltage power supply.
Common line entry methods: ring network type (such as HXGN cabinet) or terminal type.
•Transformer room
The core part, with built-in oil-immersed or dry-type transformers (usually with a capacity of 50kVA~2500kVA), realizes the conversion from high voltage to low voltage (such as 10kV/0.4kV).
Equipped with temperature control, heat dissipation system (such as fans, shutters) and explosion-proof pressure relief devices.
•Low-voltage room
Low-voltage distribution cabinet (such as GGD, GCK cabinet), including circuit breakers, metering instruments, capacitor compensation devices, etc., distributes 400V power to the user end.
The shell material can be stainless steel, aluminum alloy or non-metallic environmentally friendly materials, with a protection level of IP23-IP54.

Features

Compact and efficient
The area is only 1/10 of that of a traditional substation, suitable for areas with limited land.
Quick deployment
Prefabricated in the factory, on-site installation only requires basic construction and commissioning, shortening the cycle by more than 70%.
Strong environmental adaptability
Anti-sand, moisture-proof, and corrosion-resistant design, can operate at -25℃~+40℃.
Flexible configuration
Supports ring network power supply, dual power supply access, and can expand photovoltaic/energy storage interfaces.
Safe and reliable
Fully insulated design, five-protection interlocking mechanism, reducing the risk of electric shock.

Technical Specification

High Voltage	Rated Voltage	10kV / 35kV	Input Voltage Level
	Rated Current	630A-1,250A	High-voltage switchgear capacity
Transformer	Rated Capacity	50-2,500 kVA	Oil immersed / Dry type options
	No-load Loss	≤300 W(oil) / 800 W(dry)	Critical energy efficiency metric
	Impedance Voltage	4%-8%	Short-circuit current limitation
Low Voltage	Rated Current	1,600 A-4,000 A	Main busbar output capacity
	Short-circuit Withstand	50 kA-80 kA(1s)	Short-circuit Withstand capacity
Environment	Operating Temperature	-25℃ to +40℃	Custom thermal control for extreme climates
	Altitude Limit	≤1,000 m	Derating required above limit
General	Protection Rating	IP23-IP54	Dust/water resistance level
	Noise Level	≤55dB (1m distance)	Dry-type transformer standard