🔍
35KV New Energy Box-Type(Chinese-Style) Substation

35KV New Energy Box-Type(Chinese-Style) Substation

The 35kV compact pre-installed substation, is a new type of box-type substation, and its products are widely used in wind farms and photovoltaic power plants. It mainly consists of the transformer body,high-voltage electrical part, low-voltage electrical part, box, etc.

Category:

Overview

The 35kV compact pre-installed substation, commonly known as the Chinese box-type substation, is a new type of box-type substation, and its products are widely used in wind farms and photovoltaic power plants. It mainly consists of the transformer body,high-voltage electrical part, low-voltage electrical part, box, etc. The transformer is a three -phase double-winding oil-immersed self-cooled non-exciting voltage-regulating power transformer; the high-voltage electrical part of the Huashi Box Transformer is mainly composed of 35kV high-voltage circuit breakers, 35kV isolating switches, 35kV current transformers, 35kV voltage transformers, 35kV lightning arresters , 35kV live displays,etc, the low-voltage electrical part of the Huashi Box Transformer is mainly composed of low-voltage frame circuit breakers, self-use systems (self-use transformers, feeder switches, etc.), surge protectors, etc.

Model Meaning

Product features

  • Compact structure, small size, easy and flexible installation;
  • Fully insulated, fully sealed structure, safe and reliable, maintenance-free, and reliably protect personal safety;
  • The high-voltage side is protected by dual fuses. The plug -in fuse is a dual sensitive fuse (temperature, current), and the backup fuse is a current-limiting fuse, which reduces operating costs;
  • High-voltage incoming lines adopt cable connector structure, which is fully insulated, safe and reliable, and easy to operate;
  • It can be used for both ring networks and terminals. The conversion is very convenient and improves the reliability of power supply.
  • The transformer is of three-phase three-pillar or three-phase five-pillar structure. The iron core adopts stepped joint process or rolled core process, which has low noise, low loss, and strong resistance to short circuit and overload.
  • Using  special process of vacuum drying and vacuum oiling our company will extend this process used in 110kV products to 10kV products, providing a strong guarantee for improving product quality.
  • The box can be designed with anti-corrosion and special painting treatment according to the requirements of the operating environment. It has “three prevention” functions, namely anti-condensation, anti-salt fog, and anti-mold functions, and can meet the anti-corrosion requirements in high temperature and high humidity environments.

Related standards&parameters

  • GB 1094.1-2013 Power transformers Part 1: General principles
  • GB/T 15164-2022 Load Guidelines for Oil-immersed Power Transformer
  • DL/T 572-2010 Power Transformer Operation Regulations
  • IEC 60076 series international standard for power transformers
  • GB 2536-2011 Transformer Oil Standard

Technical Requirements For Chinese Substation

The Huashi box transformer consists of three parts: a high-voltage chamber, a transformer, and a low-voltage chamber. Each chamber is separated into independent compartments by separators, and a manhole is provided in the box for convenient installation and maintenance, Its internal layout is set in accordance with the requirements of standard design drawings. The box transformer adopts natural cooling method, and the temperature of the low pressure chamber is controlled below 60 ℃ through the cooling device in the cabinet to ensure a good operating environment for secondary equipment. A communication cabinet needs to be installed on the transformer cabinet (Install switches, optical fiber boxes and other equipment), UPS battery cabinets operate under continuous long-term overload at 1.1 times (the oil temperature shall not exceed 85℃ in the project environment), 1.2 times (the oil temperature shall not exceed 85 ℃ in the project environment, and the temperature rise under short-term overload operation at 1.5 times shall comply with the provisions of General Equipment for Power Transmission and Transformation Projects of State Grid Corporation of China ” (Typical Specifications for Power Transformation and Distribution Stations of 66kV and Below) and Table 3-2 relevant values.

Dehumidification, explosion prevention and condensation prevention measures should be taken inside the box transformer. Cable holes in high and low pressure rooms should be sealed with polymer flexible sealing material TS-68 on the basis of sealing with fireproof mud. Install sealing strips on the cabinet door of the box transformer.The sealing strip is made of ethylene propylene diene monomer rubber, which has good heat resistance, weather resistance, ozone resistance, corrosion resistance and aging resistance.Live parts such as high-voltage cable heads, busbars, and terminal terminals are fully insulated with flame retardant and thermally conductive silicone rubber insulating material TS-10, After insulation treatment, the high-voltage parts of 35kV shall be able to withstand the voltage withstand voltage of 40.5kV for 1 minute; After insulation treatment the low-voltage busbars shall be able to withstand the voltage withstand voltage of 2.5kV for 1 minute. High-voltage bushing porcelain bottles, insulating rods, insulators and other insulating devices are brushed with high self-cleaning anti-pollution flash coating SRTV,with a coating thickness of 0.4±0.1mm. The seller is responsible for modifying the added cooling fan and adopting external circulation ventilation for cooling. (Delete) The design service life of the box transformer should not be less than 30 years. Each compartment of the box transformer should be equipped with a combination configuration of low-power normally-powered heater and dehumidifier. Ventilation holes should be reasonably set according to the volume of the cabinet. The box transformer temperature and humidity signal should have remote transmission function and be uploaded to the box transformer through the communication interface. Measurement and control device.

Appearance and installation dimensions

Technical Parameters

Item unit High-Voltage Switch Transformer Low-Voltage Apparatus
Rated Voltage kV 12 40.5 10.5/0.8 35/0.8 0.8
Rated Capacity KVA 1000-3300
Rated Frequency HZ 50 50 50
Rated Current A 200 63
1 min Power Frequency
withstand Voltage		 Interphase
And Ground		 kV 42 95 35 85 5
Isolate
Fracture		 kV 48 110
Lightning Impulse
withstand Voltage		 Interphase And Ground kV 75 185 75 220 12
Isolate Fracture kV 85 215
Rated Short Circuit Breaking Current (Effective Value) KA 31.5 50
Rated Short-Time Withstand Current (Effective Value) KA 20(4S) 20(4S) 40(1S)
Rated Short-Circuit Closing Current (Peak) KA 50 50
Rated Peak Withstand Current kA 50 50
Protection Grade IP33
Noise Level ≤55dB

Component Selection Table

Rated Capacity
(KVA)		 High Voltage Switch High Voltage Fuse High Voltage Lightning Arrester Low Voltage
Switch		 Auxiliary
Transformer
12 40.5 12 40.5 12 40.5
1000 FZRN25-12
VTK-12		 FT16-40.5 XRNT-12/100 XRNT-40.5/30 HY-5WZ-17/45 HY-5WZ-51/134 RDW1
Circuit Breaker
KFW2
Circuit Breaker		 Capacity can be
determined on
demand
1600 XRNT-12/160 XRNT-40.5/30
2000 XRNT-12/200 XRNT-40.5/60
2500 XRNT-40.5/80
3150 XRNT-40.5/100A
3300 XRNT-40.5/100A

 

Frequently Asked Questions

What is a Prefabricated Distribution Substation?

A Prefabricated Distribution Substation is a factory-assembled power distribution solution that integrates a transformer, medium voltage switchgear, low voltage switchgear, protection equipment, control systems, and auxiliary components into a compact prefabricated enclosure.

It is designed to simplify transportation, installation, commissioning, and operation, making it suitable for utility power distribution, industrial plants, commercial buildings, solar power plants, wind farms, data centers, mining projects, and infrastructure applications.

What is the difference between a Prefabricated Substation and a conventional substation?

A conventional substation generally requires more equipment installation and construction work at the project site.

A prefabricated substation is largely assembled and tested in the factory before delivery. This can reduce on-site construction and wiring work, shorten installation time, simplify project coordination, and improve manufacturing quality control.

It is particularly useful for projects where space, installation time, transportation, or construction conditions are limited.

What equipment is included in a Prefabricated Distribution Substation?

The configuration can be customized, but a typical prefabricated distribution substation may include:

  • Power transformer
  • Medium voltage switchgear
  • Low voltage switchgear
  • Ring main unit
  • Circuit breaker
  • Load break switch
  • Protection relay
  • Metering system
  • Busbar system
  • Surge protection
  • Control and monitoring system
  • Auxiliary power system
  • Lighting and ventilation system
  • Prefabricated enclosure

The final configuration is determined according to the customer’s single-line diagram, electrical specifications, application, and local grid requirements.

What type of transformer can be installed in a Prefabricated Substation?

LBAJI can integrate both oil-immersed transformers and dry-type transformers into prefabricated substations.

Oil-immersed transformers are commonly used for utility, industrial, renewable energy, and outdoor distribution applications.

Dry-type transformers are often selected for commercial buildings, data centers, indoor installations, and projects where fire safety and reduced environmental impact are important.

What voltage levels are available?

The substation can be designed for different medium voltage and low voltage systems according to the project requirements.

Common medium voltage levels include:

6kV, 10kV, 11kV, 13.8kV, 15kV, 20kV, 22kV, 24kV and 35kV.

The secondary voltage can also be customized according to the local distribution system, such as 400V, 415V, 480V, 690V and other low voltage requirements.

What transformer capacities are available?

LBAJI can provide different transformer capacities according to the project’s electrical load.

Common capacities include:

100kVA, 160kVA, 250kVA, 315kVA, 400kVA, 500kVA, 630kVA, 800kVA, 1000kVA, 1250kVA, 1600kVA, 2000kVA and above.

For large industrial and renewable energy projects, multiple-transformer configurations can also be considered.

Can I choose copper or aluminum windings?

Yes. Depending on the transformer design and project requirements, customers can select copper or aluminum windings.

Copper windings generally provide excellent electrical conductivity and mechanical strength, while aluminum windings can offer a more economical solution.

The appropriate winding material can be selected according to the required performance, budget, operating conditions, and project specifications.

Can the medium voltage and low voltage switchgear be customized?

Yes.

The MV and LV switchgear can be configured according to the customer’s electrical system, including:

  • Rated voltage
  • Rated current
  • Short-circuit capacity
  • Circuit breaker type
  • Protection relay
  • Metering
  • Busbar configuration
  • Cable entry and exit
  • Control and communication requirements

Customers can provide their single-line diagram or technical specification, and LBAJI can develop the corresponding configuration.

Is a Prefabricated Distribution Substation suitable for solar power plants?

Yes.

Prefabricated substations are widely used in solar photovoltaic power plants because they can integrate transformers, MV switchgear, LV equipment, protection, monitoring, and auxiliary systems into a compact solution.

They can help simplify electrical integration between the PV generation system and the grid or local distribution network.

Can a Prefabricated Substation be used for wind farms?

Yes.

For wind power projects, prefabricated substations can be designed according to the project’s collection voltage, transformer capacity, grid connection requirements, protection system, and environmental conditions.

The solution can be customized for wind farms, distributed wind power systems, and renewable energy collection systems.

Are Prefabricated Substations suitable for industrial plants?

Yes.

They are commonly suitable for factories, manufacturing facilities, warehouses, mining operations, oil and gas facilities, and other industrial applications.

A customized configuration can provide medium voltage incoming power, transformer voltage conversion, low voltage distribution, protection, metering, and monitoring within one integrated system.

Can they be used for commercial buildings and data centers?

Yes.

Prefabricated substations can be configured for commercial buildings, shopping centers, office buildings, hospitals, data centers, and other critical facilities.

For these applications, the design can place greater emphasis on reliability, protection, redundancy, fire safety, monitoring, and continuous power availability.

Can Prefabricated Substations be used in mining projects?

Yes.

Mining projects often require reliable power distribution in remote and demanding environments.

The enclosure, transformer, switchgear, ventilation, corrosion protection, and protection system can be customized according to the temperature, dust, altitude, humidity, transportation, and site conditions.

Can LBAJI manufacture a customized Prefabricated Distribution Substation?

Yes.

Customization is one of the main advantages of LBAJI’s prefabricated substation solutions.

The following can be customized:

  • Transformer capacity
  • Transformer type
  • Primary and secondary voltage
  • Frequency
  • MV switchgear
  • LV switchgear
  • Protection system
  • Metering system
  • Enclosure dimensions
  • Cable entry arrangement
  • Ventilation system
  • Fire protection
  • Monitoring system
  • Communication system
  • Internal layout
Can you manufacture the substation according to our drawings?

Yes.

Customers can provide a single-line diagram, general arrangement drawing, technical specification, equipment list, or project tender document.

LBAJI’s engineering team can review the information and develop the equipment configuration according to the project requirements.

Can you design the electrical system if we do not have a complete specification?

Yes.

If you do not have a complete technical specification, you can provide basic information such as:

Power capacity + input voltage + output voltage + frequency + application + quantity + project location.

Based on this information, the engineering team can help recommend a suitable transformer and switchgear configuration.

Can the enclosure dimensions be customized?

Yes.

The enclosure dimensions can be designed according to the internal equipment arrangement, transportation limitations, installation location, maintenance space, cable routing, ventilation requirements, and local regulations.

For projects with limited installation space, a compact layout can be developed.

What standards can the Prefabricated Distribution Substation comply with?

The substation can be designed and manufactured according to applicable international and regional standards.

Depending on the equipment configuration and destination market, relevant IEC standards and local electrical regulations can be considered.

Customers can specify required standards, testing procedures, certification requirements, and grid codes before production.

How is the Prefabricated Substation protected against electrical faults?

The protection system can include:

  • Overcurrent protection
  • Short-circuit protection
  • Earth-fault protection
  • Transformer protection
  • Surge protection
  • Circuit breaker protection
  • Fuse protection
  • Temperature monitoring
  • Other customized protection functions

The protection scheme is selected according to the voltage level, transformer capacity, grid configuration, and project requirements.

Does LBAJI conduct factory testing before shipment?

Yes.

The electrical equipment can undergo factory testing before shipment according to the applicable standards and agreed technical requirements.

Testing may include transformer tests, insulation tests, switchgear operation tests, wiring checks, protection function checks, and other required inspections.

This helps reduce potential problems during installation and commissioning at the project site.

Can you provide test reports and technical documentation?

Yes.

Depending on the project requirements, LBAJI can provide relevant technical documents such as:

  • Technical specifications
  • Single-line diagrams
  • General arrangement drawings
  • Foundation drawings
  • Wiring diagrams
  • Equipment lists
  • Factory test reports
  • Inspection documents
  • Operation manuals
  • Installation instructions
  • Maintenance documentation
Can a Prefabricated Distribution Substation be installed outdoors?

Yes.

Prefabricated substations are commonly designed for outdoor installation.

The enclosure can be customized according to the local environment, including waterproofing, dust protection, ventilation, cooling, anti-corrosion treatment, temperature control, and other environmental requirements.

Can the substation be used in hot, cold, humid, or dusty environments?

Yes.

The design can take local environmental conditions into consideration, including:

  • Ambient temperature
  • Humidity
  • Rainfall
  • Dust
  • Salt spray
  • Altitude
  • Corrosive environments
  • Solar radiation

Customers should provide the project location and environmental conditions so the equipment can be properly designed.

How is the Prefabricated Substation transported?

The transportation method depends on the overall dimensions, weight, equipment configuration, and destination.

LBAJI can provide relevant dimensions, weight, lifting points, packing information, loading requirements, and transportation documentation to support international logistics planning.

How long does it take to install a Prefabricated Distribution Substation?

Because major components can be assembled and tested before shipment, on-site installation can be significantly simplified compared with a conventional site-built substation.

The actual installation time depends on the foundation preparation, equipment configuration, cable connections, site conditions, and commissioning requirements.

Does the Prefabricated Substation require a foundation?

Yes.

A suitable foundation is normally required to support the equipment and ensure safe and stable installation.

LBAJI can provide foundation interface dimensions and installation drawings according to the final substation configuration.

Can LBAJI provide a complete turnkey Prefabricated Substation solution?

Yes.

LBAJI can provide an integrated solution covering:

Engineering Design → Equipment Selection → Manufacturing → Factory Testing → Packing → Delivery → Technical Documentation

The exact project scope can be customized according to the customer’s requirements.

Can I purchase the transformer and switchgear separately?

Yes.

Customers can purchase a complete prefabricated substation or procure individual products such as:

  • Oil-immersed transformers
  • Dry-type transformers
  • MV switchgear
  • LV switchgear
  • Ring main units
  • Box-type substations
  • PV electrical equipment

This provides flexibility for EPC contractors, distributors, system integrators, and electrical equipment importers.

Do you support OEM and customized orders?

Yes.

OEM and customized solutions can be discussed according to project requirements.

Customization may include equipment configuration, enclosure design, nameplates, documentation, electrical specifications, and other applicable requirements.

What information is required to get a quotation?

For an accurate quotation, please provide as much of the following information as possible:

  • Transformer capacity
  • Primary voltage
  • Secondary voltage
  • Frequency
  • Transformer type
  • Quantity
  • MV switchgear requirements
  • LV switchgear requirements
  • Protection requirements
  • Application
  • Project location
  • Applicable standards
  • Delivery destination

If you do not have all the information, simply send us your project requirements or single-line diagram. Our engineers can help evaluate the suitable solution.

Why choose LBAJI for Prefabricated Distribution Substations?

LBAJI provides integrated electrical equipment solutions covering transformers, medium voltage switchgear, low voltage switchgear, box-type substations, photovoltaic electrical equipment, and other power distribution products.

With manufacturing and engineering capabilities, LBAJI can coordinate multiple electrical components within one prefabricated solution, helping customers simplify equipment procurement, system integration, installation, and project management.

Our solutions can be customized for utility, renewable energy, industrial, commercial, infrastructure, mining, and other power distribution applications.

Where can I buy a Prefabricated Distribution Substation?

LBAJI supplies customized prefabricated distribution substations for international projects and supports OEM, project-based, EPC, distributor, and industrial procurement requirements.

Customers can submit their voltage, transformer capacity, application, quantity, destination country, and technical requirements for evaluation and quotation.

How much does a Prefabricated Distribution Substation cost?

The price depends on the transformer capacity, voltage level, transformer type, winding material, MV and LV switchgear configuration, protection system, enclosure dimensions, standards, quantity, and delivery destination.

For this reason, a project-specific quotation is more accurate than a standard product price.

What is the lead time for a customized Prefabricated Substation?

Lead time depends on the substation configuration, transformer capacity, customization requirements, quantity, testing requirements, and production schedule.

After receiving the technical specifications, LBAJI can provide a project-specific production and delivery schedule.

Can I send my project specifications for evaluation?

Yes.

You can send your single-line diagram, technical specification, tender document, equipment list, or basic project requirements.

LBAJI’s engineering team can review the information and recommend a suitable prefabricated substation configuration.

Related products