Why do electrical systems need to be grounded?
The basic reasons for grounding or not grounding the electrical system and the various types of system grounding, as well as the practices commonly used to ground electrical systems are discussed. Purpose: Grounding of an electrical system is a decision that must be faced by engineers charged with planning or modifying electrical distribution.
What is electrical system grounding?
Grounding of an electrical system is a decision that must be faced by engineers charged with planning or modifying electrical distribution. Grounding in some form is generally recommended, although there are certain exceptions. Several methods and criteria exist for system grounding; each has its own purpose.
Why is correct grounding important for uninterruptible power supplies (UPS)?
As with any electrical system, correct grounding of uninterruptible power supplies (UPS) is essential to the overall safety and performance of the system. In particular, personnel safety, equipment protection, and electronic performance can all be jeopardized by incorrect or ineffective grounding.
What are the reasons for grounding a power system?
Where an industrial or commercial power system includes power-generating equipment, the reasons for grounding these components may be the same as those for grounding similar components of public utility systems. The methods of grounding would generally be similar under like conditions of service.
What is an effective grounded system?
Effectively grounded systems are systems whose line-to-ground short-circuit current (ISLG) is at least 60% of the three-phase, short-circuit value (I3ph). A system is effectively grounded when grounded through a suficiently low impedance (inherent or intentionally added, or both) so that the coeficient of grounding (COG) does not exceed 80%.
What type of grounding should be used for industrial generation?
aCaution should be applied in using this form of grounding with industrial generation (see IEEE Std 367). This form of grounding is ideal for use on medium-voltage generators. Also occasionally found on mission-critical 2.4 kV or 4.16 kV industrial or commercial distribution systems. 5. Obtaining the system neutral
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