Ground fault protection schemes

Figure 15.24 Equivalent control circuit diagram for a differential ground fault protection scheme of Figure 15.22...

Duration This will depend upon the ground fault protection scheme adopted and may be considered as follows ... 

Important parameters for selecting a ground fault protection scheme 20/669... 

Below we briefly discuss the criteria and theory of selecting a grounding system to achieve a desired level of fault current to suit a predetermined ground fault protection scheme, i.e. type of grounding and grounding impedance to suit the system voltage, type of installation, and location of installation. 

When some extra impedance R, Xq, Xi or a combination of these is introduced into the ground circuit it will become possible to alter the magnitude and the characteristic of the ground circuit current, /g, to suit an already designed ground fault protection scheme as discussed below. 

A ground fault protection scheme that is easy to handle, clear the fault quickly and prevent it from spreading. 

Grounding Theory and Ground Fault Protection Schemes... 

Grounding theory and ground fault protection schemes 21/679... 

Exposure of a human body to touch and step voltages and methods to deal with these are also covered. Grounding and ground fault protection schemes are described in detail with illustrations to help an engineer to select the most appropriate grounding method and ground fault protection scheme for a machine or system. 

Arc suppression coil or ground fault neutralizer Ground fault factor (GFF) Magnitude of temporary overvoltages Insulation coordination Application of different types of grounding methods (for HT, HV and EHV systems) Important parameters for selecting a ground fault protection scheme... 

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