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Trivia - EL.DE.AN.

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EL.ectrical DE.sign AN.alysis

EL DEAN = "The Dean"

Synonyms: Administrator, Headmaster, Senior, Veteran

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Faults - Scenario 4

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This post demonstrates how to estimate the kiloAmpere Interrupting Capacity (kAIC) rating of the first circuit breaker at the secondary side of a transformer using the Infinite Bus Method. The method assumes infinite supply from the primary side with negligible line impedances. Below is a modified version of Example D13 (Available Short Circuit Current)  in Appendix D of the 2017 Philippine Electrical Code (PEC). SITUATION Two adjacent buildings are supplied by two different distribution transformers. One transformer is single-phase rated 100kVA, 230V with 2.5% impedance. The other is three-phase rated 100kVA, 230V line-to-line and also has 2.5% impedance. What minimum kAIC ratings are needed for the first circuit breakers down the line of each transformer to safely interrupt the maximum symmetrical fault currents? ANALYSIS 1.) SINGLE-PHASE TRANSFORMER LOAD-SIDE SUB-CIRCUIT Base Power, 1ph: S,base = 100kVA Base Voltage, 1ph: V,base = 230V Impedance, ...
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According to the Philippine Electrical Code (PEC), Article 1.3 (Electrical Plans and Specifications) states that the Plan Requirements (Section 1.3.2.1) are as follows: (A) Location and Site Plans (B) Legend or Symbols (C) General Notes / Specifications (D) Electrical Layout (Floor Plan) (E) Schedule of Loads (F) Design Analysis (G) One Line Diagram Details of each part shall be covered on a later post, but together, they provide a complete picture of the electrical system of a given project. Parts A, B, D and G provide a "schematic overview" of the electrical system, while parts C and E provide an "elaborate description" of the nature and components of the electrical project. Design Analysis (F), however, is the part that provides justification for the decisions made in the schematic arrangements and the component choices for the project. As such, it requires a quantitative approach to prove beyond any doubt that the electrical system is establ...
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