H - Electricity
02
J
323/20
H02J 3/06 (2006.01) G05F 1/30 (2006.01) H03H 7/20 (2006.01)
Patent
CA 1253203
Abstract of the invention Phase shifter Phase shifters are used in meshed, multi-phase power supply systems (N1, N2) for improving their transmission stability and for load-flow regulating purposes. In order to be able to use a less costly exciter transformer (1) of lower rating or the tertiary or compensation winding of a system coupling transformer for generating intermediate- circuit voltages (u, v, w) as a function of system input voltages (U, V, W), a resonant circuit (3, 3', 5, 6) is provided between the exciter transformer (1) and an auxil- iary transformer (2). In this resonant circuit consisting of series-connected capacitors (3, 3') and inductive resis- tances (5) which are connected to taps (7 - 9) between these capacitors and can be switched in and out by means of alternating-current switches (6), tap voltages (u', v', w') are generated which are supplied to the primary windings of the auxiliary transformer (2). At the secondary windings, connected in series with phase conductors (LU, LV, LW) of the auxiliary transformer (2), auxiliary voltages occur which are superimposed on the system input voltages (UD V, W) and effect the desired phase shifts. Instead of air chokes (5) which can be switched off, chokes with a ferro- magnetic core or the impedance of a transformer, the secon- dary winding of which can be short-circuited by means of an alternating-current switch, can also be used as variable inductive resistances in the resonant circuit. The induc- tive resistances (5) can also be star-connected instead of delta-connected.
473119
Ari Niyazi
Linhofer Gerhard
Bbc Brown Boveri & Company Limited
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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