Page 892 - Industrial Power Engineering and Applications Handbook

Protection, maintenance and testing of capacitor units 26/843
List of formulae used Current unbalance

Voltage unbalance (26.2)

N' Vph (26.1) I, = Unbalanced current through the interconnected
= 3N2. N, - 3N. N, f 2N neutral
I, = current per capacitor unit
V,, = Unbalanced voltage across the open delta. This is
for grounded systems. For isolated systems, it will
be three times this Further reading

AIEE Committee, Rrport of (2 Sunq on tlw Coniirc.tiorr of Shlrfit
Capacitor Banks, Report, Vol. 77, pp. 1452-58, Feb. (1959).
Central Board of Irrigation and Power, India, Mcinucrl of! Skirrir
N = number of units failed Power Capacitors - Operritiorz and Mriintennnc~~. Technical Report
No. 33, Jan. (1984).
N, number of units in series per group per phase Longland, T., Hunt, T.W. and Brecknell. W.A. I'oiivr Cop<wi/of-
=
N2 = number of units in parallel per group per phase Hundbook, Butterworth. London (1984).