Handbook of Electrical Engineering

574 HANDBOOK OF ELECTRICAL ENGINEERING q) Simplified solution In the proposed system, used as the example above, it is acceptabl ...

CALCULATION OF VOLT-DROP IN A CIRCUIT CONTAINING AN INDUCTION MOTOR 575 This compares well withIgofound in the rigorous case. Eo ...

576 HANDBOOK OF ELECTRICAL ENGINEERING Hence the terminal voltage of the generatorVgnis:- Vgn= EoZogn Zgn = 0. 9691 −j 0 .0359 p ...

CALCULATION OF VOLT-DROP IN A CIRCUIT CONTAINING AN INDUCTION MOTOR 577 Hence the terminal voltage of the generatorVgsis:- Vgs=I ...

578 HANDBOOK OF ELECTRICAL ENGINEERING All the impedances are in their complex formR+jX. The simplifications made in t) have bee ...

CALCULATION OF VOLT-DROP IN A CIRCUIT CONTAINING AN INDUCTION MOTOR 579 Note that a b Vo= Zg(Zl−Zlm) (Zl+Zg)Zlm Substitute for Z ...

580 HANDBOOK OF ELECTRICAL ENGINEERING Therefore |V|= 0. 2508 × 1. 9701 2. 1158 × 0. 9563 × 100 = 24 .42% Which compares pessim ...

CALCULATION OF VOLT-DROP IN A CIRCUIT CONTAINING AN INDUCTION MOTOR 581 Table G.1. Motor data for graphical estimation of volt-d ...

582 HANDBOOK OF ELECTRICAL ENGINEERING Figure G.5 Volt-drop when starting an induction motor. Nomograph for the volt-drop in per ...

CALCULATION OF VOLT-DROP IN A CIRCUIT CONTAINING AN INDUCTION MOTOR 583 Figure G.7 Volt-drop when starting an induction motor. N ...

584 HANDBOOK OF ELECTRICAL ENGINEERING reactances between 15% and 25%, and for motors up to about 15 MW. The main parameter of t ...

Appendix H Worked Example for the Calculation of Earthing Current and Electric Shock Hazard Potential Difference in a Rod and Gr ...

586 HANDBOOK OF ELECTRICAL ENGINEERING Step 1. Find the total positive, negative and zero sequence impedances in the circuit. Th ...

EARTHING CURRENT AND ELECTRIC SHOCK HAZARD POTENTIAL DIFFERENCE 587 Table H.1a. Earth fault current as a function of earth resis ...

588 HANDBOOK OF ELECTRICAL ENGINEERING Table H.1b. Properties of the fault current for different X-to-R ratios X-to-R ratio (pu) ...

EARTHING CURRENT AND ELECTRIC SHOCK HAZARD POTENTIAL DIFFERENCE 589 Use the method described in IEEE80 sub-section 14.4 even th ...

590 HANDBOOK OF ELECTRICAL ENGINEERING Figure H.1a Grid resistance versus the number of meshes on a side of a grid. Similarly th ...

EARTHING CURRENT AND ELECTRIC SHOCK HAZARD POTENTIAL DIFFERENCE 591 Figure H.1b Corner mesh potential versus the number of meshe ...

592 HANDBOOK OF ELECTRICAL ENGINEERING The following auxiliary equations are introduced to simplify the work involved:- U 11 = ρ ...

EARTHING CURRENT AND ELECTRIC SHOCK HAZARD POTENTIAL DIFFERENCE 593 Calculate the constantsKh,KiiandKmfor use in equation 68 fro ...