A ground fault circuit interrupter, called a GFCI or GFI, is an inexpensive electrical switchgear device that can either be installed in your electrical system or built into a power cord to protect you from severe electrical shocks. Electric shocks can cause severe injury or even death. Even exposure to current as low as 100 ma current for only 2 seconds can cause death. … [Read more...] about GFCI (Ground Fault Circuit Interrupter) – Working, Types, Installing and Troubleshooting
The term Grounding or Earthing refers to the connecting of a conductor to earth. The neutral points of generator and transformer are deliberately connected to the earth. In 3 phase a.c. systems the earthing is provided at each voltage level. If a neutral point is not available, a special Earthing Transformer is installed to obtain the neutral point for the purpose of … [Read more...] about Neutral Grounding (Earthing) and Equipment Grounding
All electrical installations and equipment comply with insulation resistance specifications so they can operate safely. Whether it involves the connection cables, the sectioning and protection equipment, or the motors and generators, the electrical conductors are insulated using materials with high electrical resistance in order to limit, as much as … [Read more...] about Difference between Dielectric Testing & Insulation Resistance Measurement
We have already given an introduction to substation earthing system in an article published earlier. Today we are going to discuss about the design of substation earthing system. Before 1960s the design criterion of substation earthing system was "low earth resistance.” (Earth Resistance< 0.5 ohms for High Voltage installations). During 1960s, the new criteria … [Read more...] about Substation Earthing System Design
In power system, grounding or earthing means connecting frame of electrical equipment (non-current carrying part) or some electrical part of the system (e.g. neutral point in a star-connected system, one conductor of the secondary of a transformer etc.) to earth i.e. soil. This connection to earth may be through a conductor or some other circuit element (e.g. a resistor, a … [Read more...] about Why Neutral Grounding or Neutral Earthing is Essential?