Guangzhou Yibian Electrical Equipment Co., Ltd.

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Qatar Prefabricated Substation with Composite Panels

A prefabricated substation (also known as a box-type substation or European-style box substation, commonly referred to as "Euro-substation") is a mobile, complete electrical distribution system assembled in advance at the factory. It consists of high- and low-voltage switchgear, transformers, and an enclosure, and is designed to replace traditional, site-built substations while delivering both substation and distribution functions.

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QatarHigh/Low-Voltage Prefabricated Substation (European-Style Pad-Mounted Transformer Station)

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Product Description

Prefabricated Substation with Composite Panels

Technical features:

1. Possesses excellent mechanical properties, including bending resistance, impact resistance, and tensile strength.

2. Strong resistance to sun exposure, radiation, and excellent heat insulation

3. Possesses antifreeze, anti-cracking, and anti-corrosion properties

4. Moisture-resistant and flame-retardant, it is less likely to produce condensation even under fluctuating temperatures in both extremely cold and hot environments.

5. "All-weather" performance is robust and can harmonize with the surrounding environment.

Detailed content

I. Product Overview

A prefabricated substation (also known as a box-type substation or European-style box substation, commonly referred to as "Euro-substation") is a mobile, complete electrical distribution system assembled in advance at the factory. It consists of high- and low-voltage switchgear, transformers, and an enclosure. Primarily designed to replace traditional civil-engineering-based substations, it efficiently delivers both substation and distribution functions.

Prefabricated substations can be used both outdoors and indoors, making them widely applicable in industrial parks, residential communities, commercial centers, public venues, airports, ports, subway systems, hotels, schools, hospitals, as well as dynamic construction sites, mines, oil fields, and other settings. Depending on their specific application, they can also be categorized into products such as prefabricated substations for urban municipal lighting, those designed for rural grid upgrades, factory power distribution systems, nuclear power plants, wind farms, highways, seaport terminals, and airports.

II. Operating Environment Conditions

1. Altitude: Not exceeding 2000m;

2. Ambient temperature: Maximum air temperature +40℃

Minimum temperature: -25°C (outdoor), -5°C (indoor);

Maximum daily average temperature +30°C, maximum annual average temperature +20°C;

3. Relative Humidity: The daily average should not exceed 95%; the monthly average should not surpass 90%.

4. Ground slope: No more than 3 degrees;

5. Earthquake Intensity: The horizontal seismic acceleration shall not exceed 0.4 m/s²

The vertical seismic acceleration does not exceed 0.2 m/s².

6. Outdoor wind speed: not exceeding 35 m/s;

The installation location must be free from fire hazards, explosion risks, chemical corrosion, and severe vibrations.

▬▬▬ Negotiable products for use in special environments

III. Model Designation

4. Main Technical Parameters

	Project	Unit	Parameters
High-Voltage Unit	Rated frequency	HZ	50
	Rated Voltage	kV	6	10	20	35
	Maximum Operating Voltage	kV	7	12	24	40.5
	Rated Current	A	400, 630, 1250
	Transfer current	A	1200 to 20,000
	Rated Short-Time Withstand Current	kA	20	25	31.5	40
	Rated Peak Withstand Current	kA	50	63	80	100
	Power-frequency withstand voltage	kV	32/36	42/48	55/60	95/118
	Ground and phase/isolation break points
	Lightning Impulse Withstand Voltage	kV	60/70	75/85	95/110	185/215
	Ground and phase/isolation break points
	Rated Short-Circuit Interrupting Current (Current-Limiting Fuse)	kA	20, 25, 31.5, 40 (31.5)
	Breaking Capacity of No-Load Transformers	kVA	2500
Transformer Unit	Rated Voltage	kV	6	10	20	35
	Rated Capacity	kVA	30 to 2500
	Tap range	%	±2 × 2.5%, ±5%
	Connection Group		Yyn0, Dyn11
	Impedance Voltage	%	4, 4.5, 6, 8
Low-pressure unit	Rated Voltage	V	220, 380, 690, 1000
	Main circuit rated current	A	50 to 4000
	Branch current	A	5 to 800
	Main circuit rated short-time withstand current	kA	15 (s), 30 (1s), 50 (1s), 65 (1s)
	Main circuit rated peak withstand current	kA	30, 63, 110
Shell	Protection Rating (Standard Products)	IP	High-voltage room IP33; transformer room IP23; low-voltage room IP33, with enclosure housing rated IP34D
	Noise Level	dB	≤50
	Shell Temperature Upgrade Level		10K

V. Product Features

1. Overall Structural Features

Feature-rich and reliable

It can interrupt short-circuit and load currents, providing full-range current protection. High-voltage options include ring main units (including dual-power supplies), terminal substations, and systems equipped with high-voltage metering—offering a variety of power supply configurations to choose from. Additionally, it features all the functionalities of conventional civil-engineering-type substations.

Low investment, minimal land use, and easy installation

Compact in structure, small in size, and requiring minimal floor space, it features an integrated multi-door design for convenient transportation, installation, operation, and maintenance. The overall European-style design primarily comes in three main configurations: the "目" (eye)-shaped integrated type, the "品" (character "pin")-shaped integrated type, and the split-type structure.

Saving money: Better than distribution transformers + The capital investment in the distribution room should be minimal;

Province-level: Small in size, occupying about the same space as a distribution transformer of comparable capacity. + The volume of the distribution room 1/3 Or even smaller;

Time-saving: Delivery can be arranged in less than a month, and on-site installation is simple—simply tighten the four mounting bolts and connect the incoming and outgoing cable lines.

Good security

Featuring a fully enclosed design, the product casing is grounded, and its outer surface contains no live components whatsoever. As a result, no insulation distance is required, reliably ensuring personal safety.

2. Component and Part Selection

Medium- and High-Voltage Equipment

a. Selection of Medium- and High-Voltage Switching Methods

Since circuit breakers primarily perform the functions of interrupting normal load currents and clearing short-circuit currents in power systems, and given their high degree of automation, they are used as 800kVA User disconnection above the transformer is the preferred option.

End users of the power system, especially 10kV Small to medium capacity 630kVA The high-voltage switches used by the following customers frequently handle normal load currents, and in most cases, load switches combined with fuses replace the main circuit breakers. Specifically, the high-voltage load switch is responsible for interrupting normal load currents, while the fuse takes care of disconnecting short-circuit currents.

b. Cabinet Type Selection

Medium- and high-voltage switchgear can be selected based on the specific application environment. XGN Fixed-type circuit breaker cabinet, KYN Armored withdrawable switchgear, HXGN Vacuum (air-compression type) load switchgear, SF6 Fully insulated sulfur hexafluoride switchgear, XGN15 Sulfur Hexafluoride Load Switchgear.

Transformer

Available in various series of dry-type or oil-immersed transformers Device

Low-voltage equipment

Our company's European transformers typically use GGD Series of fixed low-voltage switchgear, which can also be provided in a withdrawable design depending on specific product requirements. GCK 、 GCS 、 GCL 、 MNS Cabinet. GGD Cabinet features:

a、 High maintainability , the cabinet root Based on component reliability and operability, low-voltage components are reasonably arranged for primarily front-access maintenance. Easily worn components such as low-voltage circuit breakers, disconnect switches, fuses, and contactors are all positioned at the front of the cabinet, ensuring convenient access for inspection and upkeep. Meanwhile, highly reliable components like copper busbars and insulators—which require minimal maintenance—are placed at the rear of the cabinet and typically do not need regular servicing or upkeep.

b. Small size: Typically, the design of European-style circuits is relatively simple, so the accompanying low-voltage equipment is designed as a single European transformer unit. GGD When using dedicated cabinets, low-voltage electrical equipment can be arranged more efficiently, reducing the footprint of the low-voltage cabinet.

Shell Types

Our company selects the enclosure for our European-style transformers based on the operating environmental conditions. Our transformer enclosures include cold-rolled steel sheets with coating, stainless steel sheets with coating, color-zinc composite panels, and non-metallic enclosures, among others.

6. Layout Configuration and Reference Overall Dimensions

YB The series of prefabricated substations is categorized into "U"-shaped and "Y"-shaped arrangements based on their layout.

1. Cross-shaped arrangement