Current control apparatus
AssigneeEaton Intelligent Power Limited
InventorsJonathan Michael Schaar, Tiefu Zhao
Life of this patent
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Abstract
An apparatus for a load tap changer includes a first primary winding electrically connected to a first contact, the first contact configured to connect to one of a plurality of taps in a load tap changer; a second contact, the second contact configured to connect to one of the plurality of taps in the load tap changer; a magnetic core; and a control circuit including: a secondary winding configured to magnetically couple to the first primary winding and the magnetic core; and an electrical network electrically connected to the secondary winding, the electrical network being configured to prevent magnetic saturation of the magnetic core during switching of the first or second contact.
Claims24
A voltage regulator comprising:
- a main magnetic core;
- a main winding comprising a plurality of taps, the main winding configured to magnetically couple to the main magnetic core;
- a first contact configured to electrically connect to one of the plurality of taps;
- a second contact configured to electrically connect to one of the plurality of taps;
- an auxiliary winding configured to magnetically couple to the main magnetic core;
- and
- an electrical network electrically connected to the auxiliary winding, the electrical network comprising one or more controllable power electronic components, wherein the electrical network is configured to receive reactive power from the auxiliary winding and to provide reactive power to the auxiliary winding.
A controller for a voltage regulator, the controller configured to:
- receive data from a sensor that measures an electrical quantity in a current path of the voltage regulator, the current path being configured to conduct electrical current between a first switchable contact and a load of the voltage regulator;
- and
- control electrical current in an electrical network based on the data received from the sensor;
- wherein
- the electrical network and a second switchable contact are configured to be magnetically coupled by a magnetic core of the voltage regulator, and controlling the electrical current in the electrical network controls magnetic saturation of the magnetic core.
A method comprising:
- electrically coupling a main winding of a voltage regulator to an alternating current (AC) electrical power distribution system;
- magnetically coupling the main winding to a first magnetic core;
- electrically connecting an electrical contact to a tap of the main winding;
- magnetically coupling an electrical network to a second magnetic core;
- magnetically coupling a first secondary winding to the second magnetic core;
- and
- controlling the electrical network to compensate for reactive power from the AC electrical power distribution system, wherein the first secondary winding is electrically connected to the electrical contact, and controlling the electrical network further comprises controlling an electrical current in the electrical contact.
A voltage regulator comprising:
- a main magnetic core;
- a main winding comprising a plurality of taps, the main winding configured to magnetically couple to the main magnetic core;
- a first contact configured to electrically connect to one of the plurality of taps;
- a second contact configured to electrically connect to one of the plurality of taps;
- an auxiliary winding configured to magnetically couple to the main magnetic core;
- and
- an electrical network electrically connected to the auxiliary winding, the electrical network comprising one or more controllable power electronic components, wherein the one or more controllable power electronic components comprises a plurality of transistors.
A voltage regulator comprising:
- a main magnetic core;
- a main winding comprising a plurality of taps, the main winding configured to magnetically couple to the main magnetic core;
- a first contact configured to electrically connect to one of the plurality of taps;
- a second contact configured to electrically connect to one of the plurality of taps;
- an auxiliary winding configured to magnetically couple to the main magnetic core;
- and
- an electrical network electrically connected to the auxiliary winding, the electrical network comprising:
- one or more controllable power electronic components, a first power converter configured to compensate for reactive power, a direct current (DC) link electrically connected to the first power converter, a second power converter electrically connected to the DC link and the first power converter, and wherein the DC link is between the first power converter and the second power converter.
Dependencies are inferred from the claim text.