Why Wye-Wye Transformer Connection is Bad?
Transformer Primary Connections Transformer primaries are usually connected in delta. The wye connection is occasionally used and may or may not have its neutral grounded. If the transformer secondary is …
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System Grounding
Secondary Grounding When a wye connected circuit and solidly or effectively grounded neutral is used, the following benefits are obtained in addition to the dual voltage capability, (a) A single …
Comparison of Common Induction Motor Starting Methods
Motor Starting Phenomenon The three-phase induction motors represent the most significant load in the industrial plants, over the half of the delivered electrical energy. Motor loads specially the medium and …
Effect of Voltage on Induction Motor Characteristics
Whenever the voltage at the terminals of an induction motor varies from its nameplate rating, either performance or life is sacrificed.The effect may be minor or serious depending upon the …
Sign-off on a Marked-up Document
In brownfield projects, particularly those facilities which are more than three (3) decades old, the availability of native CAD file drawings is almost nil. Redrafting the facility drawing is not …
Compliance to Standards and Statutory Laws
What is a Statutory Law? What do NFPA 70, BS 7671 and AS/NZS 3000 have in common? The former is National Electrical Code (U.S.), the next is the wing regulation …