YBM Prefabricated Substation (12kV/24kV/40.5kV)

YBM prefabricated substation for 12kV/24kV/40.5kV distribution networks, 50–2000 kVA transformer capacity, IP33 weatherproof enclosure. Three-compartment design (HV / transformer / LV), SF6 or vacuum HV switchgear, oil-immersed or dry-type transformer, ABB/Schneider LV breakers. IEC 62271-202 compliant. Factory pre-assembled, cuts site installation time by 70%.

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Product Description

YBM Prefabricated Substation (12kV / 24kV / 40.5kV)

Raydafon YBM prefabricated substation — also known as a European-style box type substation or compact secondary substation — integrates high-voltage switchgear, a power transformer, and low-voltage distribution equipment into a single weatherproof enclosure. Compliant with IEC 62271-202 and IEC 60076, the YBM platform supports distribution networks from 12kV to 40.5kV with transformer capacity from 50 kVA to 2000 kVA. The YBM prefabricated substation is factory pre-assembled, pre-wired, and type-tested — delivered to site ready for cable termination and energization, cutting installation time from weeks to days.

12kV / 24kV / 40.5kV 50–2000 kVA Transformer IP33 Weatherproof IEC 62271-202 Compliant

YBM Prefabricated Substation — Core Specifications at a Glance

40.5kV Max Rated Voltage

2000kVA Max Transformer Capacity

20kA Short-Time Withstand / 2s

IP33 Shell Protection Degree

Raydafon YBM prefabricated substation 12kV 24kV 40.5kV with three-compartment design and weatherproof enclosure — Figure 1: Raydafon YBM prefabricated substation — factory pre-assembled three-compartment design with high-voltage, transformer, and low-voltage rooms

Product Overview

YBM prefabricated transformer substations, also known as European box type transformer substations, are compact complete power distribution devices that integrate high-voltage electrical appliances, power transformers, and low-voltage electrical equipment. The YBM prefabricated substation offers strong completeness, a compact structure, a small footprint, easy relocation, safe and reliable operation, convenient maintenance, and clean appearance. YBM prefabricated substations are particularly suitable for urban public distribution, high-rise buildings, residential communities, industrial and mining enterprises, ports, oil fields, parks, railway stations, airports, subways, highways, and other power supply locations — a modern, rapid-deployment alternative to conventional concrete substations.

Three-Compartment Layout

High-Voltage RoomIncoming & Ring Network

Pre-installed HV switchgear with "five-prevention" interlocking. Choose from SF6 load break switches, vacuum load break switches, compressed-air switches, or vacuum circuit breakers. Supports terminal, ring-network, and dual-power supply configurations.

12kV / 24kV / 40.5kV

Transformer RoomOil-Immersed or Dry-Type

Accommodates oil-immersed fully-sealed transformers, amorphous-alloy transformers, or dry-type transformers from 50 kVA to 2000 kVA. Gas protection and temperature control protection can be integrated for unattended operation.

50–2000 kVA / D,yn11

Low-Voltage RoomDistribution & Compensation

Outgoing distribution with ABB, Schneider, or Cooper LV breakers. Reactive power compensation supports common compensation, group compensation, full-group compensation, and zero-crossing switching. Rated current up to 4000 A.

100–4000 A / 400 V

Technical Specifications

High-Voltage Components

Rated Frequency50 / 60 Hz

Rated Voltage12 kV

Power-Frequency Withstand (to ground / phase)42 kV

Lightning Impulse Withstand75 kV

Rated Current630 A

Short-Time Withstand20 kA / 2s

Rated Peak Withstand50 kA

Low-Voltage Components

Rated Voltage400 V

Main Circuit Rated Current100–4000 A

Short-Time Withstand50 kA

Rated Peak Withstand105 kA

Compensation ModeAuto / Group / Zero-crossing

Transformer Parameters

Nameplate Capacity50–2000 kVA

Tapping Range±2 × 2.5% / ±5%

Vector GroupD,yn11

Noise Level≤ 55 dB

Types AvailableOil / Dry / Amorphous

Enclosure & Installation

Shell ProtectionIP33

Layout Forms"Eye" / "Pin" shaped

Cable EntryBottom cable entry hole

Room LightingAuto on / off with door

StandardsIEC 62271-202 / 60076

Enclosure Material Options

Four Shell Materials for Different Environments

Steel Plate

High strength, low cost, suitable for standard industrial sites

Aluminum Alloy Plate

Lightweight, corrosion-resistant, coastal and humid environments

Composite Color Steel

Weatherproof, aesthetically coordinated with urban surroundings

GRC

Glass Fiber Reinforced Cement

Non-metallic, non-conductive, best environmental coordination

Delivery & Installation Workflow

STEP 01Factory Pre-Assembly

STEP 02Type-Test & FAT

STEP 03Site Delivery

STEP 04Cable Termination

STEP 05Energization

Industry Applications

Urban Public Distribution

Compact footprint fits dense residential blocks, commercial districts, and urban renewal projects. The low voltage switchgear room supports ABB/Schneider outgoing feeders for mixed commercial-residential loads.

Industrial & Mining Enterprises

Rugged enclosure with IP33 protection for dusty, humid, and high-temperature industrial sites. Compatible with medium voltage switchgear for plant-level distribution.

Renewable & New Energy

Integrates with solar PV and wind farm collection systems. Pair with energy storage systems for grid-tied or off-grid operation.

Infrastructure & Transport

Railway stations, airports, subway tunnels, and highway service areas. The prefabricated substation reduces on-site civil work by up to 70% vs. conventional concrete substations.

Ports, Oil Fields & Parks

Coastal and remote installations require corrosion-resistant shells. Aluminum alloy or GRC enclosures are recommended. The Remote-9001 monitoring unit supports unattended operation.

Replacement & Retrofit

Compact YBM prefabricated substation replaces ageing concrete or brick substations without extended outage windows. Pre-wired delivery allows changeover in a single weekend.

Why Choose Raydafon YBM Prefabricated Substation

20+ Years of Power Equipment Experience

Raydafon Technology Group has served the electrical equipment industry for over two decades, with products deployed across 40+ export countries. YBM prefabricated substations are a core product line in the RAYDAFON turnkey distribution portfolio.

Turnkey Integration Capability

YBM enclosures are factory-integrated with ring main units, draw-out switchgear, dry-type transformers, and remote monitoring — all from a single supplier with unified quality control.

IEC & Type-Test Compliance

All YBM prefabricated substations are type-tested to IEC 62271-202 and IEC 60076, with routine factory acceptance tests (FAT) documented and shipped with every unit. Type-test reports available on request.

Full Documentation & After-Sales

Installation drawings, single-line diagrams, transformer test reports, and component authenticity records ship with every YBM prefabricated substation. Engineering support responds within 24 hours.

Frequently Asked Questions

What is a YBM prefabricated substation?

A YBM prefabricated substation is a factory-assembled, weatherproof enclosure that integrates high-voltage switchgear, a power transformer, and low-voltage distribution equipment into a single unit. Also known as a European-style box type substation, the YBM prefabricated substation is delivered pre-wired and pre-tested, requiring only cable termination and energization on site. It is commonly used for urban distribution, industrial plants, renewable energy projects, and infrastructure.

What voltage and capacity range does the YBM prefabricated substation support?

The YBM prefabricated substation supports distribution networks at 12 kV, 24 kV, and 40.5 kV. Transformer capacity ranges from 50 kVA to 2000 kVA, with oil-immersed, dry-type, and amorphous-alloy transformer options. Low-voltage rated current is 100–4000 A at 400 V. Shell protection is IP33, and the enclosure complies with IEC 62271-202 and IEC 60076.

What is the difference between a YBM prefabricated substation and a conventional concrete substation?

A YBM prefabricated substation is factory pre-assembled and pre-tested, while a conventional concrete substation is built on site from separate civil, electrical, and mechanical stages. The YBM prefabricated substation cuts site installation time by up to 70%, reduces civil works, and can be relocated if required. See the prefabricated substations range for the full product family.

What high-voltage switchgear options are available inside the YBM prefabricated substation?

The high-voltage room supports SF6 load break switches, vacuum load break switches, compressed-air switches, and vacuum circuit breakers. All HV switchgear provided with the YBM prefabricated substation includes the "five-prevention" interlocking function and can be configured for terminal, ring-network, or dual-power supply modes. See ring main units for integrated RMU options.

Which enclosure material should I choose for the YBM prefabricated substation?

Steel plate is the standard low-cost option; aluminum alloy plate offers corrosion resistance for coastal sites; composite color steel is used where visual coordination with urban surroundings is required; and glass fiber reinforced cement (GRC) is a non-metallic, non-conductive option for the most demanding environmental coordination. Most urban YBM prefabricated substations use GRC enclosures to blend with surrounding architecture.

What is the delivery time and MOQ for YBM prefabricated substations?

Standard YBM prefabricated substation configurations ship within 35–55 days from order confirmation. MOQ is 1 unit. Custom transformer capacity, protection schemes, or integrated remote monitoring may require 60–75 days. Factory acceptance test reports and installation drawings ship with every YBM prefabricated substation.

Related Equipment

For a complete distribution solution, pair the YBM prefabricated substation with:

Medium Voltage Switchgear — For plant-level MV distribution upstream of the transformer
Ring Main Units (RMUs) — For SF6 or SF6-free ring network applications
Draw-Out Switchgear — For downstream LV draw-out distribution in the substation
GGD Low Voltage Fixed Switchgear — For cost-effective fixed-mount LV distribution
Remote-9001 Monitoring Unit — For SCADA integration and unattended operation

12kV / 24kV / 40.5kV distribution networks

50–2000 kVA transformer capacity

Three-compartment factory pre-assembly

IP33 weatherproof shell

IEC 62271-202 and IEC 60076 compliant

Reduces site installation time by 70%

Ready to Specify Your YBM Prefabricated Substation?

Share your rated voltage, transformer capacity, and enclosure material preference — our engineers will reply with a tailored YBM prefabricated substation layout and factory-direct quote within 24 hours.

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