11kV pole mounted transformer for medium voltage overhead distribution networks and outdoor utility power systems.

11kv Pole Mounted Transformer

High Voltage: 11kV

Low Voltage: 400/230V, 415/240V, 480Y/277V

Connection Group: Dyn11, YNyn0

Short-Circuit Impedance: 4.25% (≤50kVA); 4.5% (≥100kVA)

Insulation BIL: 12/28/75kV

Standards: IEC 60076, IEEE C57.12.20, IEEE C57.12.34

Certifications: DOE 2016, CE, KEMA

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Product Advantages

As the terminal node of the distribution network, the 11kV pole-mounted transformer directly determines the power delivery quality of the last 500 meters. They are exposed outdoors all year round and need to deal with lightning strikes, salt fog, humidity and even small animal intrusion, while still maintaining stable operation.

Among current mainstream solutions, oil-immersed pole-mounted transformers are still the main force of urban and rural power grids due to their heat dissipation advantages and cost-effectiveness; while medium-voltage products such as 11kV pole-mounted transformers are commonly used in industrial parks and distributed photovoltaic access points. Their core mission is only two things: to safely step down high-voltage electricity to the voltage level available on the user side, and to maintain a low failure rate in harsh environments.

Selection Suggestions for 11kV Pole-Mounted Transformer

Single-phase or three-phase? Oil-immersed or dry-type? Scenario-based selection suggestions: different power-use scenarios are like patients with different physical conditions and need “targeted treatment”:

Rural Single-Household Power Supply

Single-phase pole-mounted transformers are more economical, especially small-capacity models of 5–30kVA. Used together with ground-mounted transformers, they can reduce visual pollution.

Urban Commercial Areas

Priority should be given to the parallel operation capability of three-phase pole-mounted transformers, and the oil-immersed structure has better heat dissipation.

Chemical Parks

Fully sealed dry-type pole-mounted transformers must be selected to avoid contact between oil gas and corrosive gases.

New Energy Access Points

Box-type substations with bidirectional protection functions are required, working with pole-mounted transformers to form a hybrid power supply system.

Technical Parameters

Item Standard Value Notes
Rated High Voltage 11kV (tap ±2×2.5%, 5-position off-load tap changer) HV side tap only; LV tap adjustment prohibited
Frequency 50 Hz / 60 Hz optional Philippines and North America use 60 Hz
Cooling Method ONAN (Oil Natural Air Natural) Fully sealed corrugated oil tank, maintenance-free outdoor design
Insulation Class Class A oil-immersed insulation Winding temperature rise ≤65K, top oil temperature ≤60K
Protection Rating IP54 Rainproof, dustproof, resistant to coastal salt fog
Operating Environment Altitude ≤1000m, ambient temperature -25°C to +40°C Custom anti-corrosion coating available for island environments
Tap Structure Off-load tap changer (NLTC) Positions: +5%, +2.5%, 0, -2.5%, -5%
Tank Type Fully sealed corrugated oil tank, no conservator Lightweight design for pole-mounted installation

FAQ

Besides the equipment itself, what supporting accessories help protect the equipment?

  • Transformer platform: the bearing capacity of the hot-dip galvanized angle steel structure should exceed 3 times the transformer weight, and windproof guy wires should also be installed in typhoon-prone areas.
  • Cable terminal: for 10kV lines, cold-shrink silicone rubber terminals are recommended, with a service life 5–8 years longer than heat-shrink terminals.
  • Transformer oil: samples should be taken every year to test breakdown voltage. If it is lower than 30kV, it must be replaced.
  • High-voltage disconnect switch: not all pole-mounted transformers need it, but distributed power access points must be equipped with a visible disconnection point.

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