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Earthing transformers

Earthing transformers are classified as standard reactors. An earthing transformer (neutral coupler) is a three-phase transformer connected to the power system to provide a neutral connection for earthing, either directly or via impedance. The earthing transformers may in addition supply a local auxiliary load.

During single-phase faults, the reactor limits the fault current in the neutral and the restoration of the power line is improved. According to the IEC 60076-6 standard, the neutral-earthing reactor is connected between the neutral of a power system and the earth to limit the line to earth current under system earth fault conditions to the desired value.

The earthing transformer creates a neutral point for a network. ZN connection is usually applied. Z connection provides linear and specified zero sequence impedance. YN+d can also be applied.

 

Product scope

  • Voltage level: up to 170 kV

 

Why Hitachi Energy is the preferred partner?

  • Optimized design fully in line with substation system design
  • Lots of references in different voltage systems and substation configurations.
  • Hitachi Energy utilizes a focus factory concept which leads to a great experience in specific products giving a very high level of consistency in design, manufacture, and test
  • All Hitachi Energy factories utilize the common design platform giving us best in class experience, consistency, and repeatability
  • Hitachi Energy utilizes best in class manufacturing and quality processes to ensure that our reactors will meet the most stringent requirements
Hitachi Energy Reactors and Inductors
power plant engineer for substation

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