WHAT IS GROUNDING
Grounding is the method by which we can avoid ourselves from electrical hazards major part of the grounding process is earth, the earth is a good conductor, so we provide a conductive path for the fault current to earth by using low resistance wires
Equipment grounding- it connects the non-current carrying conductive materials such as cable trays, junction boxes and motor frames to earth ground.
System grounding- in this the neutral point of the current carrying conductor such as the neutral point of a circuit or a transformer will be connected to earth ground
WHAT IS A GROUND FAULT
A ground fault is an unwanted connection between the system conductors and the ground.fault will create many problems it can shut down power and damage the equipment, the ground fault will create health and safety risk to personnel, it will also cause fire and electric shocks
WHAT IS UNDERGROUND SYSTEM
There won’t be any intentional connection between the conductor and the earth in this, none of the conductors aren’t connected with the earth, in a system, there will be a capacitive coupling between the system conductors and the grounded surface, the ungrounded system is like a capacitively grounded system
its main feature is it has the ability to remove the earth faults without any interruption, this provides better continuity of the operation during the ground faults. It has the distributed capacitance feature and it provides a neutral point for the system, the problem will arise during the ground fault condition. A ground fault in one of the line will result in full line to line voltage will appear on the other two phases and it will cause a voltage more than the normal to present in all the insulation in underground phase
LOW RESISTANCE GROUNDED SYSTEM
If low resistance grounding is done to the neutral it will limit the ground fault current to a high level, these devices can clear the fault really quick mostly within a few seconds such fast response time has many advantages
ADVANTAGES OF LOW RESISTANCE GROUNDING
- It reduces the damage to the equipment
- It will prevent the occurring of additional faults
- Safety can be assured
- Faults will be localized
- It prevents overheating of conductors
- It prevents mechanical stress on conductors