EARTHING THROUGH RESISTORS
This is the most common, economical and sufficient solution. It is used when the neutral of the supply transformer is available and its own impedance is not enough to limit the fault current.

There are different resistance material used to build a Neutral Earthing Resistor:
  • cast iron resistance elements : fragile, no corrosion resistance
  • liquid resistor : old technology, maintenance problems due to evaporation or freezing of electrolyze.
  • Neutral Earthing Resistors made from stainless steal are the best technical and economical solution.
 

Range
   
transfoEDF.gif (17958 octets)


resist12kv.gif (27115 octets)
Electrical criteria
Rated fault current : from 5 to 5000 A.
Rated voltage : from 0.38 to 500 kV.
Rated time : from 1 sec to continuous time rating.

Mechanical criteria
Direct connection or through top or side mounted bushing.
Protection degree of housing : from IP 00 to IP 55 (recommended IP23).
Finishing: hot dip galvanized, painted or stainless steel housing.

Options
Current transformer HV or LV.
ON or OFF load disconnecting switches.
Space heater.
Elevating stands.
   
   
Technologies used
 

GRIDEX N
GRIDEX U
GRIDEX G
  
 
Special construction :

To meet the client requirements, we have designed and supplied disconnecting and change aver switch cabinets comprising disconnectors and current transformers for direct earthing through the Neutral Earthing Resistor.
 
Read our technical file

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