Reactive power compensating system
This patent describes a reactive power compensating system for a three phase induction machine comprising: an array of switchable capacitors connected to a power line of each phase, means for measuring the reactive power drawn; logic decision means responsive for selecting the capacitors of each array required to compensate for power drawn by the induction machine, and means responsive for switching selected capacitors of each array onto the power line associated with the array. The reactive power measuring means is comprised of means for sensing the current through a power line of only one phase. Means for converting the current sensed into a proportional voltage signal is initiated. A means is used for sampling and holding voltage for at least a half cycle when the voltage of the one phase crosses zero.
- Assignee:
- Dept. of Energy, Washington, DC
- Patent Number(s):
- US 4677364
- OSTI ID:
- 6332785
- Country of Publication:
- United States
- Language:
- English
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Reactive power compensator
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Related Subjects
420800* -- Engineering-- Electronic Circuits & Devices-- (-1989)
CAPACITORS
COMPUTERIZED CONTROL SYSTEMS
CONTROL SYSTEMS
DECISION MAKING
ELECTRIC GENERATORS
ELECTRIC POTENTIAL
ELECTRICAL EQUIPMENT
ELECTRONIC CIRCUITS
EQUIPMENT
INDUCTION GENERATORS
MATHEMATICAL LOGIC
POWER TRANSMISSION LINES
SAMPLING
SIGNALS
SWITCHING CIRCUITS