Back to results
US 2018/0331533 A1Published application
Electrical system protection strategy using slip frequency calculation
OwnerYang Lifenginventor
Life of this patent
Estimating the term…
Abstract
An electrical system includes a plurality of synchronous electrical machines, and an electronic control unit structured to controllably trip a circuit breaking mechanism such as a relay coupling together the electrical machines. The control unit executes control logic to select trip options responsive to slip frequency between the synchronous electrical machines that is induced by a power swing.
Claims19
A method of protecting an electrical system comprising:
- receiving data indicative of an angle of an impedance trajectory defined by an impedance in the electrical system during a power swing;
- calculating a value indicative of a frequency of a slip between a first and a second electromagnetic machine M the electrical system that is induced by the power swing, responsive to the data;
- asserting a trip mode responsive to the calculated value;
- and
- outputting a trip command to a circuit breaking mechanism in the electrical system according to the asserted trip mode so as to decouple the first and the second electromagnetic machines.
2 more elements
An electrical system protection mechanism comprising:
- a circuit breaking mecha.nisna positionable within a circuit coupling a first electromagnetic machine to a second electromagnetic machine;
- sensing mechanisms structured to monitor parameters of the electrical system indicative of impedance;
- an electronic control unit coupled with the sensing mechanisms and in control communication with the circuit breaking mechanism, and the electronic control unit being structured to determine an angle of an impedance trajectory defined by the impedance during a power swing, and to calculate a value indicative of a frequency of a slip between the first and second electromagnetic machines that is induced by the power swing, responsive to the determined angle;
- and
- the electronic control unit further being structured to assert a trip mode responsive to the calculated value, and to output a trip command to the circuit breaking mechanism according to the asserted trip mode so as to decouple the first and the second electromagnetic machines.
2 more elements
An electrical power system comprising:
- a plurality of electromagnetic machines;
- electrical circuitry coupling together the plurality of electromagnetic machines;
- a circuit breaking mechanism coupled with the circuitry and structured to decouple two of the plurality of electromagnetic machines;
- and
- an electronic control unit in control communication with the circuit breaking mechanism, and being structured to determine an angle of an impedance trajectory defined by an impedance in the electrical circuitry during a power swing, and to determine a frequency of a slip between the plurality of electromagnetic machines that is induced by the power swing, responsive to the determined angle;
- the electronic control unit further being structured to output a trip command to the circuit breaking mechanism at a timing that is based at least in part on the determined frequency.
3 more elements
Dependencies are inferred from the claim text.