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When designing an industrial High Voltage Network, a suitable Neutral to Earth arrangement must be selected: The Neutral can be either insulated or connected to earth. ► HV networks with insulated neutral contributes to operational continuity since it does not trip on first fault. However, Network capacitance must be such that an earth fault current will not endanger personnel or damage equipments. ► HV networks connected to earth do have to compromise between : • Limitation of damages and disturbances caused by an earth fault • Provision of a simple but selective Protecting Device Earthing can...

Data Requirements ► System Voltage.: This is the Phase-to-Phase Voltage. ► Rated Voltage : This is the Phase-to-Neutral Voltage, (equal to System Voltage / V3) ► Rated Fault Current : This is the maximum Current allowed to appear in case of Fault We always take into consideration a 1 to 3% (of rated fault current) leakage current in our design to allow unbalanced systems. • In High Resistance Grounding, the fault current is usually limited & reduced to 25 A. They are mainly used in Distribution systems • Low Resistance Grounding is commonly used in Transmission Systems. ► Rated Fault Duration...

hJEK Request form/ Electrical Data Enclosure Arrangement / Design Ambient Temperature Max allowed Temperature Rise (if Different from IEEE-32) Protection Level (IP Level) Housing Finishing (Galvanized, Hot Dip, Stainless Steel, painted...) Free in Air / Inside the Resistor Cubicle / In separate Enclosure Free in Air / Inside the Resistor Cubicle / In separate Enclosure Current Transformers (Neutral or Earthing Side -Ratio -Burden -...) Voltage Transformers (Ratio -Burden -...) Disconnectors (Current Rating -Manual / Motorized -On/Off-Load...) Surge Arrestor (Ratings ...)