10kV State Grid Standardized Box Transformer

State Grid standardized Transformer Equipment includes three types: standard, compact, and alternative. The standard type of Transformer Equipment is suitable for areas with sufficient space for equipment and significant power loads; the compact type is ideal for areas with limited installation space, such as streets, where the importance of power loads is moderate. In addition, the alternative type provides a transitional solution, which is only suitable for replacing American box-type transformers that are in operation but have safety risks. These designs ensure reliable integration with the power grid transformer, and the advanced Transformer Equipment helps maintain stable and efficient power distribution.

Zhejiang Lvma Electric Co., Ltd. 10kV State Grid Standardized Box Transformer is available in standard, compact and alternative versions to match different site‑space conditions, load priorities and renovation‑project requirements.

Standard Type - Large‑load zones with sufficient installation space The standard‑version unit applies to sites with ample ground space and heavy power‑consumption loads. It is widely deployed for new urban residential communities, large industrial zones, commercial complexes and municipal power distribution nodes, delivering stable medium‑to‑low voltage power supply for high‑capacity power‑consuming users.

Compact Type - Space‑constrained urban public areas Featuring space‑saving layout, the compact model fits locations with limited installation room and moderate‑priority power loads. Typical scenarios include city streets, downtown roadside power distribution points, small‑size residential blocks and urban reconstruction projects where land resources are tight.

Alternative Type - Safety‑risk equipment replacement projects The alternative type serves as a transitional retrofit solution. It is specially used for upgrading existing in‑service American‑style box transformers with hidden safety hazards, helping power utilities eliminate equipment risks without large‑scale grid reconstruction.

All three versions adopt factory‑integrated modular design, minimizing field construction work and adapting to urban new‑build and power‑grid‑renovation projects.

Full‑range type coverage for diverse project needs

We supply three complete variants: standard, compact and alternative types. Whether you need equipment for high‑load new projects, space‑limited downtown sites, or safety‑oriented replacement of old risky American‑style box transformers, we can provide matching standardized solutions.

Strict standardized manufacturing & reliable performance

Every unit is manufactured in accordance with unified design standards. Key components undergo strict incoming inspection and complete factory pre‑commissioning before delivery, ensuring consistent quality and stable field operation for distribution‑grid projects.

Optimized modular factory pre‑assembly

Complete assembly and testing are finished inside our factory. On‑site work is reduced to foundation preparation and cable connection only, shortening project construction cycle and lowering field labor costs.

Proven practical experience in grid renovation projects

Our standardized box transformers have been adopted in multiple municipal urban renewal and power‑grid modernization projects. We possess rich experience for both new distribution network construction and old‑equipment safety‑replacement retrofit assignments.

Complete technical support & document deliverables

We provide full sets of English technical drawings, operation manuals and factory test reports. Remote technical guidance is available for installation, commissioning and daily maintenance to support your project execution.

Foundation and Site Preparation

Construct a flat, load‑bearing concrete foundation according to drawing requirements. Ensure effective drainage to prevent water ponding beneath and inside the cabinet. Reserve adequate surrounding space for daily operation, inspection and maintenance. For alternative‑type replacement projects, verify the dimension compatibility with original installation position before civil work.

Lifting and Positioning

Lift the equipment by designated lifting lugs only. Avoid violent collision or impact during hoisting and transportation. Place the box transformer accurately onto the finished foundation and adjust for level alignment.

Earthing Work

Reliably connect the cabinet grounding terminals to the site grounding grid complying with power safety standards. Good earthing is critical for personal safety and fault protection performance.

High‑voltage & Low‑voltage Cable Connection

Carry out cable termination and wiring strictly following official wiring diagrams. Apply correct torque to all connection terminals. For alternative‑type retrofit projects, double‑check phase sequence consistency with original grid circuits.

Pre‑energization Inspection & Testing

Inspect cabinet doors, sealing strips, locking devices and internal components for integrity. Measure insulation resistance, check protection parameter settings and complete all necessary functional tests before energization.

Energization and Acceptance Hand‑over

Perform step‑by‑step power‑on procedure. Confirm no abnormal noise, temperature rise or fault signals during trial operation. Hand over installation checklists, drawings and related technical documents upon project acceptance.

Important Note: All installation, commissioning and maintenance work must be completed by qualified certified electrical technicians, in compliance with local power codes.

Transformer Module Options

Selectable oil‑immersed distribution transformer or dry‑type transformer; multiple capacity grades and voltage ratios are available to match actual local load demands for new‑build or retrofit projects.

High‑voltage & Low‑voltage Cabinet Accessories

Optional load switch, circuit breaker, fuse combination unit, metering module, and reactive power compensation capacitor bank for power‑factor improvement, meeting power measurement and energy‑saving requirements of municipal distribution networks.

Protection & Intelligent Monitoring System

Optional integrated protection relay, fault recording unit, remote communication module and RTU terminal. It supports real‑time operating data upload, remote alarm and fault signal feedback for smart grid management.

Cabinet Environment‑adapted Accessories

Built‑in dehumidifier, anti‑condensation heater and ventilation fans are optional for high‑humidity or cold regions. Reinforced anti‑corrosion surface treatment can be provided for coastal or heavily polluted areas. Cabinet color can follow project‑specified RAL color requirements.

Auxiliary Functional Parts

Optional cabinet internal lighting, door travel switch, external lightning‑protection components, dedicated lifting accessories and customized foundation frame. For alternative‑type replacement projects, we can supply transition adapter parts to fit original installation dimensions.

All optional configurations comply with standardized design specifications, and can be combined according to site conditions and project technical requirements.

a) When operators are required to operate components from inside the transformer, an internal operating channel should be reserved. The width of the operating channel should be no less than 800mm, and the protruding mechanical transmission device on any equipment opening position, switchgear and controlgear should not reduce the width of the channel to less than 500mm.

b) The base should be made of metal and have sufficient mechanical strength to ensure that the transformer will not be deformed or damaged during lifting, transportation and use. There should be at least 4 retractable lifting pins on the base to ensure safe transportation.

c) The European box-type substation consists of three independent small chambers: high-voltage chamber, transformer chamber and low-voltage chamber. The compartments are separated by partitions. Its internal layout structure is set according to the requirements of standard design drawings. The box-type substation adopts natural ventilation. The temperature rise of the transformer inside the box-type transformer shell exceeds the value of the temperature rise of the same transformer measured outside the box-type transformer shell, and should not be greater than the value of the shell level. Dehumidification, explosion-proof and anti-condensation measures should be taken inside the box-type substation. The power control box for the station should have functions such as lighting, inspection and maintenance.

d) Ring network or terminal type ring network cabinets are used for high-voltage equipment. The products are compact in structure, small in size, easy to install, reliable in performance and require little maintenance. The ring network cabinet has a complete "five-protection" interlocking function, and the strength of the interlocking device meets the requirements of operation. All accessories such as casing, partitions, and insulating parts in the ring network cabinet should be made of fire-resistant and flame-retardant materials. The fuse installation position of the load switch-fuse combination electrical cabinet should be convenient for operators to replace the fuse. The panel of the ring network cabinet should be equipped with a live display and phase verification device, and the model and parameters of the phase verification device should be provided. Phase verification device and operating handle, as necessary accessories, should be provided in one set at each station.

e) The frame of the ring main unit is made of aluminum-zinc plate (the thickness of the zinc coating reaches AZ150 and above, which can be in accordance with the requirements of GB/T 14978) or galvanized steel plate(grade: DX51D+Z275, which can be in accordance with the requirements of GB/T 2518).

f) The specific configuration of low-voltage switchgear should be in accordance with the specific scheme diagram.

g) The outer shell of the box transformer can be made of metal materials or flame-retardant non-metal materials. If aluminum-zinc plate, galvanized plate, stainless steel and other metal materials are used, the thickness should not be less than 2mm, and they should be treated with anti-corrosion and sprayed with a protective layer. The protective layer should be sprayed evenly and have strong adhesion to ensure that it will not rust for 30 years; if flame retardant non-metal materials are used, the flame retardancy of the materials should meet the requirements of 5.104.2.3 in GB17467-2020. The outer shielding decorative layer of the box transformer should be made of decorative strips made of flame-retardant, aging-resistant and non-deformable composite materials. The top cover of the box body can be made of metal materials or flame-retardant non-metal materials. Safety warning signs such as "Stop, High Voltage Danger" and "No Touching" should be added to the four sides of the shell.

h) The color of the transformer shell and embedded metering box should be State Grid Green, with CMYK values of C100 M5 Y50 K40, PANTONG 3292C. If there are special requirements, they should be coordinated with the surrounding humanities and geographical environment. Hang (spray) warning signs such as "Stop, High Voltage" and "Electricity Danger" in obvious positions. The panel color of the internal cabinet of the transformer should be RAL7035.

i) The top cover should adopt a double-layer, sloping roof structure with heat insulation effect, and the steep slope should not be less than 5°, to reduce the indoor temperature increase of substation caused by sunlight. The top should bear a load of no less than 2500N/m2 and ensure that the top of the box does not seep or drip.

j) The fire protection level of the materials used in the shell structure should ensure the basic performance level in the event of a fire inside or outside the box-type transformer.

k) The protection level of the transformer chamber should not be lower than IP33D, and the protection level of other compartments should not be lower than IP43; when the equipment inside the transformer is operated by the operator from outside, the protection level of the housing of the high-voltage switchgear and control equipment should not be lower than IP4X, and the protection level between the internal compartments should not be lower than IP2XC; the protection level of the ventilation holes in the inaccessible parts such as the top of the cabinet of the low-voltage switchgear and control equipment should not be lower than IP3X, the protection level of other ventilation holes should not be lower than IP3XD, the protection level of other parts of the cabinet should not be lower than IP4X, and the partition should not be lower than IP3b. The overall protection level of the cabinet should not be lower than IP33D.

l) Cable head: Fully insulated, fully shielded, touchable cold shrink elbow type silicone rubber power cable head.

m) The ring main unit should be equipped with an embedded short-circuit ground fault indicator. It is recommended that the fault indicator be passive or battery-powered. The battery-powered type can be plugged in and out while powered. The gas-insulated ring main unit can be equipped with a gas pressure gauge with auxiliary contacts as required.

n) The door should not be higher than 2000mm and should be equipped with a door lock with anti-theft, anti-rust and anti-blocking functions; the door should be able to open outwards and there should be a reliable device to lock the door to prevent it from closing; the ground wire connecting the door and the cabinet frame should be a copper wire of not less than 2.5mm2.

o) The casing of the box-type substation can withstand mechanical stress of 20J.

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