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US Electrification
Ground Fault Protective Devices
ABB

Ground Fault Protective Devices

Electrical Systems always have the possibility of  shutdowns due to over currents or short circuits produced by operation mistakes, ambient conditions, lack of maintenance, or atmospheric discharges.... More

Electrical Systems always have the possibility of  shutdowns due to over currents or short circuits produced by operation mistakes, ambient conditions, lack of maintenance, or atmospheric discharges.
In the case of a short circuit, this can be classified in the next types:

1. Bolted Faults

It occurs when the conductors (phase, neutral, or ground) are solidly connected, having an impedance equal to cero on this connection and because this, a maximum current condition is present.

 

2. Ground Fault

It occurs when one of the system phases get on direct contact to the ground or to any metallic part that is grounded.

 

3. Arcing Fault

It happens between two close conductors but not in direct contact. 

Ground Fault Protective Devices
RCD- Residual Current Devices
RCDs are the safest device to detect and trip against electrical leakage currents, thus ensuring protection against electric shock caused by indirect contacts.

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