Overview

The H61 pole‑mounted distribution transformer is a three‑phase, oil‑immersed unit specifically designed for overhead distribution networks, particularly in rural and peri‑urban areas where reliable and low‑maintenance power supply is critical. This transformer type is widely specified by electricity utilities in French‑speaking West African countries (such as Côte d'Ivoire, Cameroon, Senegal, etc.), where it serves as a standard solution for medium‑voltage to low‑voltage (MV/LV) power conversion.

Manufactured in strict compliance with IEC 60076, as well as NF C52‑112‑1, HD 428.1 and HN 52‑S‑20 standards, the H61 transformer guarantees safe, efficient and long‑lasting operation even under harsh environmental conditions.

Key Features & Benefits

Designed for Overhead Networks – Optimised for pole‑top installation, enabling quick deployment and easy access for maintenance crews.

Hermetically Sealed Tank – The tank is vacuum‑filled and fully sealed, preventing oil oxidation and moisture ingress; consequently, no maintenance is required under normal service conditions.

Eco‑Friendly Dielectric – Standard mineral oil is PCB‑free, and a natural ester (vegetable oil) version is available upon request, offering better biodegradability and fire safety.

Robust Cooling – ONAN (Oil Natural Air Natural) cooling ensures adequate heat dissipation without fans or pumps, reducing auxiliary power consumption and increasing reliability.

Strong Corrosion Protection – The tank is finished with a RAL 7033 cement grey coating and benefits from an enhanced anti‑corrosion treatment, providing excellent resistance to atmospheric attack, high humidity and salt spray.

Reliable Core & Coil – The magnetic circuit uses grain‑oriented silicon‑steel sheets, and both medium‑voltage (MV) and low‑voltage (LV) windings are made of copper, ensuring low losses and high short‑circuit withstand capability.

Simple Voltage Regulation – A padlockable, off‑load tap changer on the cover allows adjustment of the primary voltage in steps of ±2.5% or ±5%, enabling field adaptation to local grid variations.

Low Noise Level – The transformer operates quietly (typically ≤ 55 dB), making it suitable for installation near residential areas.

Proven Longevity – With proper maintenance, an expected service life of 25 to 30 years under normal operating conditions is achievable.

Technical Specifications (Typical Range)

All technical parameters are subject to IEC 60076 tolerances and can be customised to meet specific customer requirements

Standard Equipment

Each H61 pole‑mounted transformer is supplied with the following components as standard:

3 high‑voltage porcelain bushings (according to DIN 42531)

4 low‑voltage porcelain bushings (according to DIN 42530)

1 padlockable off‑load tap changer on the cover (5 positions, ±5%)

1 pressure relief valve (suppression valve)

1 oil filling port

1 oil drain / sampling device

2 earth terminals on the cover

2 lifting rings (for active part and complete transformer)

1 square support welded to the bottom of the tank (for pole mounting)

1 rear‑side standardized hook

1 nameplate (available in French or English)

1 warranty seal

Optional Add‑Ons (Available on Request)

Vegetable oil (natural ester) filling for enhanced fire safety and biodegradability.

Cut‑off protection function (TPC) – integrates a combined fuse‑switch (three MV fuses with striker, associated with a three‑phase disconnector) and an earth‑fault detection device sensitive to currents as low as 5 A, improving safety and service continuity.

Resin high‑voltage bushings instead of porcelain.

Anti‑bird protection devices.

Special voltages or ratings beyond the standard range.

Additional corrosion protection for extreme coastal or industrial environments.

Applications

Rural electrification – providing first‑time access to electricity in remote villages.

Peri‑urban power distribution – supplying residential areas,commercial zones and public facilities.

Renewable energy integration – stepping down medium voltage from solar or mini‑hydro installations.

Agricultural and irrigation projects – powering water pumps and processing equipment.

Temporary construction sites – offering a quickly deployable power solution.

Mining camps and remote industrial installations – where overhead line distribution is the most economical choice.

Why Choose KAIBEITE as Your H61 Transformer Manufacturer?

Full Compliance – Our H61 transformers meet IEC 60076, NF C52‑112‑1, HD 428.1 and HN 52‑S‑20 standards, and are accepted by major utilities in French‑speaking Africa.

Proven Export Experience – We have supplied distribution transformers to more than 20 countries, including several West and Central African nations, with a track record of successful deliveries.

Full Customisation – Voltage, rating, vector group, bushing type, coating colour and accessories can all be tailored to your exact project specifications.

Stringent Quality Testing – Routine tests are performed on every unit in our ISO 9001‑certified factory. Witness tests and third‑party inspections (e.g., SGS, Bureau Veritas) are also available.

Competitive Lead Times – Standard delivery takes 15 to 30 working days after order confirmation, depending on quantity and customisation level.

Responsive Technical Support – Our team provides installation guidance, commissioning assistance and remote fault diagnosis throughout the warranty period.

How to Order or Get a Quotation

To receive a detailed quotation, please provide the following information:

Required rated capacity (kVA)

Primary voltage (kV)

Secondary voltage (V)

Frequency (50 Hz or 60 Hz)

Quantity

Any optional requirements (vegetable oil, TPC protection, special bushings, etc.)

We will respond within 24 hours with a formal quotation and preliminary technical datasheet.

Technical Specifications (Typical Range)

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