By Paul M. Anderson
This vintage textual content will give you the major to realizing brief circuits, open conductors and different difficulties in relation to electrical energy platforms which are topic to unbalanced stipulations. utilizing the tactic of symmetrical parts, stated professional Paul M. Anderson presents accomplished advice for either discovering ideas for faulted strength platforms and protecting protecting procedure purposes. you will learn how to clear up complicated difficulties, whereas gaining a radical heritage in common configurations.
Features you will positioned to fast use:
- Numerous examples and problems
- Clear, concise notation
- Analytical simplifications
- Matrix equipment appropriate to electronic computing device technology
- Extensive appendices
Diskette records can now be stumbled on by way of getting into in ISBN 978-0780311459 on booksupport.wiley.com.
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Extra info for Analysis of Faulted Power Systems (IEEE Press Series on Power Engineering)
47 ) and ( 2. 48) become ZSO = Zaa ZS l = ZS2 = 0 ( 2 . 50) and ZMO = Zb c ZM I = ZM2 =0 ( 2. 46), w e note that the simultaneous application o f ( 2 . 50 ) and (2. 51 ) eliminates the off-diagonal terms of Zm n-o l 2 ' This means that Zmn - o l 2 is not only reciprocal but that there is zero coupling between sequences. 5 1) alone will still result in a nonreciproc al Zm n- O I 2 ' Special case 3-symmetric impedance. A less restrictive case than those above is one in which the self or mutual impedances are symmetric with respect to phase a , Le.
38) is the desired result, but it is not in pu. 38) Example - V� SB (P watt) Ru - Xu = p2 + Q2 ( 1 . 3, we select, quite arbitrarily, a base voltage of 161 kV for the transmission line and a base voltampere of �� l l �L � ' "'�-""""" + ""'j-:-IO""'O-O""'h--� 5 Om y Fig. 3. ood A two-machine system. 20 MV A. Find the pu impedances of all components referred to these bases. 8 kV, x = 0. 8-161 kV , x = 0 . 8 pf lag Solution Using equation ( 1 . 1 5 ) , we proceed directly with a change in base for the apparatus.
Ie.!.. _ _ / I Ie I Ie2 Va REF (0) (b) Fig. 3. 1 2 . Phasor diagrams for a LL fault : (a) currents ( b ) voltages. Phasor diagrams of currents and voltages are shown in Figure 3 . 1 2. Note that if Z, were zero the voltage "triangle " would collapse to zero on the b-c side and the Vo l - V0 2 phasor would go to zero . 3 T he Double L ine-to-G round ( 2LG ) Fault 1 . Circuit diagram : The fault connection is shown in Figure 3 . 1 3 . Note that symmetry with respect to phase a is obtained by faulting phases b and c.