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US 10,326,303 B2Granted
Transfer switch
AssigneeCummins Power Generation IP, Inc.
InventorsYong Wang, Fangwei Zheng, Xuefeng Ji, Dejun Cheng, Yuxiang Wei, Dongyan Chu
Life of this patent
Estimating the term…
Abstract
A transfer switch transfers electric power provided to an electrical load from a first power source to a second power source. The transfer switch includes a coil arrangement that controls movement of a member to open or close a contactor of the first or second power source. The coil arrangement may be used with two voltage levels.
Claims35
An apparatus, comprising:
- a transfer switch to transfer AC electric power provided to an electrical load from a first source to a second source, the transfer switch including:
- an output to provide the AC electric power to the load;
- a first contactor to selectively provide the AC electric power to the load from the first source;
- a second contactor to selectively provide the AC electric power to the load from the second source;
- and
- an electromagnetic contactor actuation arrangement including:
- a first electric coil;
- a second electric coil;
- a selector electrically coupled to the first coil and the second coil to provide an operating voltage across the first coil if a first AC power voltage level is selected and the second coil if a second AC power voltage level is selected;
- and
- a moveable contactor actuation member responsive to a magnetic field change to change a state of at least one of the first contactor or the second contactor between an open state and a closed state, the first coil generating the magnetic field change if the AC electric power provided to the load is at the first AC power voltage level, and the second coil generating the magnetic field change if the AC electric power provided to the load is at the second AC power voltage level.
8 more elements
An apparatus, comprising:
- a transfer switch to transfer AC electric power provided to an electrical load from a first AC power source to a second AC power source, the transfer switch including:
- a selector to select between a first AC power voltage and a second AC power voltage;
- and
- an electromagnetic actuator responsive to a voltage level drop to make or break an electric circuit providing the AC electric power to the load through the transfer switch, the electromagnetic actuator including:
- a coil arrangement to provide a magnetic field in response to an electric current flowing therethrough, the coil arrangement being electrically coupled to the selector to provide an operating voltage across a first number of turns of the coil arrangement if the first AC power voltage is selected and a second number of turns of the coil arrangement if the second AC power voltage is selected, the first number of turns being different than the second number of turns;
- and
- an actuation member responsive to a change in the magnetic field caused by the voltage drop to change position and correspondingly change state of the transfer switch.
4 more elements
An apparatus, comprising:
- a transfer switch to transfer AC electric power provided to an electrical load from a first source to a second source and operable at two or more different voltage levels, the transfer switch including:
- an output to provide the AC electric power to the load;
- a first AC electrical power input to provide the AC electric power to the load from the first source;
- a second AC electrical power input to provide the AC electric power to the load from the second source;
- and
- an electromagnetic switching arrangement responsive to a voltage change of the AC electric power to make or break an electric pathway between the output and at least one of the first input and the second input, the arrangement including:
- an actuation member structured to move in response to a change in the predefined magnetic field and correspondingly make or break the electric pathway;
- a first electric coil being structured to produce the predefined magnetic field if the AC electric power corresponds to a first one of the voltage levels, and
- a second electric coil being structured to produce the predefined magnetic field if the AC electric power corresponds to a second one of the voltage levels.
6 more elements
A method, comprising:
- providing a transfer switch to transfer AC electric power provided to an electrical load from a first AC power source to a second AC power source, the transfer switch including a switch actuator with a coil arrangement, the coil arrangement including a first coil, a second coil, and an actuation member, the first coil and the second coil each being positioned to induce a predefined magnetic field in the actuation member;
- determining a voltage level for the AC electric power;
- controlling movement of the switch actuation member with the first coil if the voltage level corresponds to a first voltage level and with the second coil if the voltage level corresponds to a second voltage level different than the first voltage level;
- and
- in response to a change in position of the actuation member, changing between an electrically closed and an electrically open state of an electric circuit between the load and at least one of the first source and the second source.
2 more elements
Dependencies are inferred from the claim text.