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Earthing Resistance – Neutral Point Resistance Protection System
Electricity distribution networks are often subject to accidental faults. In other words, these faults occur as a result of occasional circumstances with no apparent cause. It is therefore essential to install protection systems . METAL DEPLOYE RESISTOR offers a range of neutral point resistors or earthing resistors (MALT) which allows this, according to your electrical needs and your environments.
This technique is preferred for small size and low voltage networks because it induces significant risks in the event of a phase earthing.
The neutral line of the system is directly connected to earth. In such a case, the short-circuit current can reach 20 to 30 times the value of the rated current.
This technique consists of inserting an impedance between neutral and earth.
Electrical impedance measures the opposition of an electrical circuit to the passage of a sinusoidal alternating current. An impedance will therefore play a role in retaining or obstructing the current.
The concept of impedance makes it possible to apply the formulas used in continuous mode to sinusoidal conditions, while integrating the effect of capacitive and inductive elements.
There are 3 types of impedances:
- Resistance
- Reactance
- Arc extinguishing coil (Petersen coil)
For multiple applications, often with demanding constraints and located throughout the world, METAL DEPLOYE RESISTOR provides a suitable technical solution: