Electrical transmission or interconnection systems – Superimposed unlike currents – Different frequencies or phase
Patent
1976-04-13
1978-08-08
Shoop, William M.
Electrical transmission or interconnection systems
Superimposed unlike currents
Different frequencies or phase
340310A, 363159, H02J 302
Patent
active
041058976
ABSTRACT:
A cycloconverter apparatus and method is disclosed in which the cycloconverter works into an active load. The cycloconverter is connected between an external power source and a load so that the load current flows through the cycloconverter. In the preferred embodiment, the cycloconverter is used to impress a signaling voltage waveform upon the voltages of the three phases of an electric power distribution feeder. This voltage is impressed by injecting it between the common point of the wye-connected secondary of the substation transformer and the grounded neutral that serves all phases of the distribution feeder. The neutral current of the distribution feeder flows through the cycloconverter. Protective by-pass circuitry is provided to maintain the integrity of the neutral path in the event of a phase-to-neutral short circuit or a failure of the cycloconverter.
REFERENCES:
patent: 2305862 (1945-12-01), Gilliver et al.
patent: 2860324 (1958-11-01), Berger et al.
patent: 3211914 (1965-10-01), Anderson
patent: 3488517 (1970-01-01), Cowan et al.
patent: 3718854 (1973-02-01), Spyrou
patent: 3991354 (1976-11-01), Rosa et al.
Jeffreys Dennis C.
Johnston Reed H.
Stratton Lawrence J.
Welz, Jr. Albert W.
Birch Richard J.
New England Power Service Company
Shoop William M.
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