Electricity: power supply or regulation systems – For phase shift or control – Using transformer
Patent
1985-02-06
1987-04-28
Salce, Patrick R.
Electricity: power supply or regulation systems
For phase shift or control
Using transformer
323217, 323218, G05F 170, H02J 318
Patent
active
046617639
ABSTRACT:
Phase shifters are used in meshed, multi-phase power supply systems for improving their transmission stability and for load-flow regulating purposes. In order to be able to use a less costly exciter transformer of lower rating or the tertiary or compensation winding of a system coupling transformer for generating intermediate-circuit voltages as a function of system input voltages, a resonant circuit is provided between the exciter transformer and an auxiliary transformer. In this resonant circuit consisting of series-connected capacitors and inductive resistances which are connected to taps between these capacitors and can be switched in and out by means of alternating-current switches, tap voltages are generated which are supplied to the primary windings of the auxiliary transformer. At the secondary windings, connected in series with phase conductors of the auxiliary transformer, auxiliary voltages occur which are superimposed on the system input voltages and effect the desired phase shifts. Instead of air chokes which can be switched off, chokes with a ferromagnetic core or the impedance of a transformer, the secondary 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 inductive resistances can also be star-connected instead of delta-connected.
REFERENCES:
patent: 3975673 (1976-08-01), Boshnyaga et al.
patent: 4013942 (1977-03-01), Boshnyaga et al.
patent: 4438386 (1984-03-01), Gyugyi
patent: 4555659 (1985-11-01), Gyugyi
John A. Ebert, "Giant Phase Shifting Transformers", pp. 14-18, Allis Chambers Engineering Review, vol. 33, No. 1, 1968.
R. M. Mathur, "A Thyristor Controlled Static Phase-Shifter for AC Power Transmission", pp. 1-6, IEEE 1980 Power Engineering Society, Jul. 1980.
Ari Niyazi
Linhofer Gerhard
BBC Brown Boveri & Company Limited
Salce Patrick R.
Todd Voeltz Emanuel
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