US3663948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling power distribution in substation
Assignee: Fuji Electric Co Ltd
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Filing: 1970-10-07
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Granted: 1972-05-16
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Expires: 1990-10-07
Abstract
Abstract An apparatus for controlling voltage flicker in power distribution in a substation, comprising a synchronous condenser, a field adjuster for the synchronous condenser and a compensation circuit, said apparatus being adapted to compensate the distribution voltage flicker due to a large load variation in said substation and being able to adjust a predetermined distribution voltage within an allowable range. The compensation circuit may include an incomplete differential circuit and means for feeding the sum of the products respectively obtained by multiplying the variable part of the respective power of each load and its respective weight coefficient.
Inventors
- 👤 Masaomi Nagae
- 👤 Sumio Yokowa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:10
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/18; H02J3/1885; Y; Y02; Y02E; Y02E40/00; Y02E40/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
196 words
An apparatus for preventing voltage flicker in power supply to variable loads from a sub-station by using compensation by a synchronous condenser, comprising: a synchronous AC machine; a reactive power detector circuit connected to the synchronous machine and providing a first output signal representing the amount of reactive power the synchronous machine delivers; a compensation circuit means associated with the variable loads and providing a second output signal representing the reactive power of the variable loads; a comparison circuit means with first and second inputs connected to said first and second output signals and having a third input point receiving a predetermined set signal to represent the amount of reactive power required, the comparison circuit including an output signal which is the equivalent of the three inputs thereto; and a field adjuster circuit connected to a field winding of the synchronous machine which adjuster circuit is also connected at an input point thereof to an output of the comparison circuit means, whereby depending on the variable loads, the reactive power output of the synchronous machine acting as a condenser is rendered variable to compensate any voltage drops due to the variable loads, thus preventing voltage flicker.
Claim 2
Independent Claim
196 words
An apparatus for preventing voltage flicker in power supply to variable loads from a sub-station by using compensation by a synchronous condenser, comprising: a synchronous AC machine; a reactive power detector circuit connected to the synchronous machine and providing a first output signal representing the amount of reactive power the synchronous machine delivers; a compensation circuit means associated with the variable loads and providing a second output signal representing the reactive power of the variable loads; a comparison circuit means with first and second inputs connected to said first and second output signals and having a third input point receiving a predetermined set signal to represent the amount of reactive power required, the comparison circuit including an output signal which is the equivalent of the three inputs thereto; and a field adjuster circuit connected to a field winding of the synchronous machine which adjuster circuit is also connected at an input point thereof to an output of the comparison circuit means, whereby depending on the variable loads, the reactive power output of the synchronous machine acting as a condenser is rendered variable to compensate any voltage drops due to the variable loads, thus preventing voltage flicker.
Claim 3
Dependent Claim
23 words
The apparatus as claimed in claim 1 in which the compensation circuit means comprises a differential circuit having a long differential time constant.
Claim 4
Dependent Claim
52 words
The apparatus as claimed in claim 1 in which the compensation circuit means includes circuitry associated with a plurality of variable loads and means for feeding into the compensation circuit means a plurality of signals obtained by multiplying a variable reactive part of each said variable load and a respective weight co-efficient.
References Cited (Backward Citations)
US3530370A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |