Electric Power Systems - Formula Sheet

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Formula Sheet – Electric Power Systems
The allowed tools at the exam are: this formula sheet, TEFYMA (or equivalent) and a
pocket calculator.
9
9
1
1
1
1
1
1
D
0
π
2
1
=
M
9
$
9
=
=
=
$
D
D
D
H
$
D
D
2
1
2
1
with
3
;
1
E
where
1
3
9
9
D
D
D
D
2
2
1
1
F
2
Three-phase per-unit base definitions according to Glover-Sarma:
6
6
φ
φ
EDVH
EDVH
=
=
=
6
6
,
1
3
3
φ
φ
EDVH
EDVH
EDVH
9
3
1
9
3
EDVH/1
EDVH//
9
9
9
2
2
=
=
=
=
9
9
=
EDVH/1
EDVH/1
EDVH//
/
3
EDVH/1
EDVH//
EDVH
,
6
6
φ
φ
EDVH
EDVH
EDVH
1
3
=
<
=
/ 1
EDVH
EDVH
Zero sequence networks of transformers, neglecting phase shift and shunt admittance:
Z n1
Z n2
Z n
3Z n1
Z eq
3Z n2
3Z n Z eq
Z eq
Electric Power Systems – Formula Sheet

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