Environmentally friendly transformer box缩略图

Environmentally friendly transformer box

Environmentally friendly transformer box插图

Currently, environmentally friendly vegetable oil has been applied to high-voltage 220/550kV transformers, achieving good electrical performance and environmental performance. The American box variable seals the switch, transformer and other high-voltage circuits inside the oil tank, which has a compact structure, and can be environmentally friendly and safe through the use of vegetable oil substitution. Realise SF6-free substitution of box transformers.

The medium voltage underground distribution station has evolved from a complex structure to a small, compact unit.

The evolution of the technology is described below:

The two-storey civil building on the first floor accommodates the introduced overhead lines. The ground floor houses the individual air switches, protection devices, transformers and low voltage units.

A one-storey civil engineering building accommodates the introduced underground lines located in the common areas. The building houses individual metal-enclosed air brake switches and protection units connected to an oil-filled transformer.

Prefabricated structure housing the introduced underground lines located in the common areas. Separate prefabricated metal modular switching and protection compartments connected to silicone or oil-filled transformers.

The integrated distribution substation combines switching, protection, and modification in a non-toxic, biodegradable, high fire point, Class K fluid medium. The equipment does not require civil structures.

The design offers the following advantages:

  • Easy installation
  • Superior transformer protection
  • Improved safety
  • Increased reliability
  • Environmentally friendly
  • SF6-free
  • High fire point Class K fluids
Environmentally friendly transformer box插图1

Millions of pad-mounted compact distribution substations have been installed in the Americas and other countries over the past 40 years. The design complies with the American National Standard (ANSI®), which contains strict guidelines to ensure operation and enclosure integrity.

Fully shielded submersible connections for indoor and outdoor applications

  • Built-in electrical stress control
  • Moulded EPDM rubber construction for freedom from contamination
  • Built-in capacitance test points to easily check circuit status
  • Rotates to three positions to select alternate source, open and ground
  • Silver plated copper contacts

Load switch unit

  • Shielded, non-resistive design for use with liquid-filled equipment
  • Includes shielding to control electrical stress with ground plates
  • Suitable for indoor or outdoor applications
Environmentally friendly transformer box插图2

Vegetable oils offer the best safety and environmental options compared to mineral oils

  • Fully biodegradable, seed-based, non-toxic fluids
  • Class K, high fire and flash points
  • Extends insulating paper life by 5 to 8 times
  • UL® classified and FM Global® certified
  • Fluid-immersed parts are Envirotemp® FR3™ fluid tested and certified
  • Dielectric strength = 56 kV
  • Ignition point = 360°C
  • Flash point = 330°C

Cost Savings

  • Minimum real estate required
  • Minimum civil works required for outdoor applications (no buildings or vaulted structures)
  • Integrated single enclosure from the same manufacturer – no need to buy and store three separate components
  • Lowest installation costs
  • Reduced external wiring and connectors
  • Envirotemp®FR3™ less flammable fluid allows indoor installation without sprinklers or vaults
Environmentally friendly transformer box插图3


  • Envirotemp FR3 Class K Fluid Essentially Eliminates Hazard of Transformer Pool Fires
  • Magnex® circuit breaker is an overcurrent protection device that also senses high fluid temperatures
  • Deadfront with shielded connectors eliminates flashover
  • Capable of operating in flood conditions
  • Integrated enclosure compartment design allows access to authorised personnel only

Environmental benefits

  • No SF6
  • Eliminates ozone-depleting SF6 gas used in RMU switching modules
  • Elimination of SF6 arc by-products
  • 1997 Kyoto Protocol – Developed countries agreed to reduce total greenhouse gas emissions, including SF6, by 5.2% over the period 2008-2012
  • Fluid charging equipment will help achieve this goal
  • Envirotemp FR3 fluid is a renewable seed oil that is non-toxic and biodegradable
  • Low profile design blends in with the environment

Operational integrity

  • Envirotemp FR3 fluid extends the thermal life of the insulation paper and increases overload capacity
  • Components are assembled and tested as a unit under the fluid at the factory
  • Reduced load loss due to elimination of cables and connections for each component

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