A device for reactive power compensation in a high voltage network having at least one phase conductor, includes a high voltage connection for each phase conductor, first and second core sections of a closed magnet circuit, a first high voltage winding enclosing the first core section, a second high voltage winding enclosing the second core section and being connected parallel to the first high voltage winding, at least one saturation switching branch being configured to saturate at least one core section has controllable power semiconductor switches, and a control unit controls the power semiconductor switches for each high voltage connection. In order to avoid leakage field losses, at least one high voltage winding has a central connection and is connected at its winding ends to the saturation switching branch. The central connection is connected to the high voltage connection.

The invention relates to a self-induction transformer which includes: At least two magnetic circuits (4 and 5) in connection, and at least three electrical windings (1, 2 and 3): The primary (1) which surrounds the free part of the first magnetic circuit. The secondary (2) which surrounds the linking part of the two magnetic circuits. The tertiary (3) which surrounds the free part of the second magnetic circuit

An electrical power control apparatus, including: a magnetic core having a plurality of phase limbs for respective phases of electric power, each of the phase limbs being interconnected to the other phase limbs at respective ends of the limb; primary windings around the respective phase limbs to receive input electrical energy in the form of input signals for the respective electrical phases and generate corresponding magnetic fluxes in the phase limbs; secondary windings around the respective phase limbs to generate output electrical energy in the form of output signals for respective electrical phases from magnetic fluxes in the phase limbs; and control windings around respective portions of the magnetic core to receive control signals for respective electrical phases to modify the magnetic fluxes in the respective phase limbs in order to modify the output signals generated from the secondary windings so that the output signals have one or more electrical attributes that satisfy respective predetermined criteria.

An electrical power control apparatus, including: a magnetic core having a plurality of phase limbs for respective phases of electric power, each of the phase limbs being interconnected to the other phase limbs at respective ends of the limb; primary windings around the respective phase limbs to receive input electrical energy in the form of input signals for the respective electrical phases and generate corresponding magnetic fluxes in the phase limbs; secondary windings around the respective phase limbs to generate output electrical energy in the form of output signals for respective electrical phases from magnetic fluxes in the phase limbs; and control windings around respective portions of the magnetic core to receive control signals for respective electrical phases to modify the magnetic fluxes in the respective phase limbs in order to modify the output signals generated from the secondary windings so that the output signals have one or more electrical attributes that satisfy respective predetermined criteria.

A driving method and a driving device using the same are disclosed. The driving method controls a pulse transformer. The secondary winding of the pulse transformer is electrically connected to a control device. Firstly, positive charging electrical energy is delivered to the primary winding, thereby charging the control device. Then, the control device is disconnected from the secondary winding while the primary winding is in a high-impedance state. Finally, negative discharging electrical energy is delivered to the primary winding and the control device is electrically connected to the secondary winding, thereby discharging the control device, and the primary winding is in a low-impedance state after the step of delivering the negative discharging electrical energy to the primary winding.

A driving method and a driving device using the same are disclosed. The driving method controls a pulse transformer. The secondary winding of the pulse transformer is electrically connected to a control device. Firstly, positive charging electrical energy is delivered to the primary winding, thereby charging the control device. Then, the control device is disconnected from the secondary winding while the primary winding is in a high-impedance state. Finally, negative discharging electrical energy is delivered to the primary winding and the control device is electrically connected to the secondary winding, thereby discharging the control device, and the primary winding is in a low-impedance state after the step of delivering the negative discharging electrical energy to the primary winding.

An electrical system (2) includes a transformer (16) coupled to an AC source (6) that provides a main AC voltage, the transformer having a number of sets of primary windings (18) and secondary windings (20), and a charging module (32) structured to generate a magnetizing AC voltage. The charging module is structured to selectively provide the magnetizing AC voltage to: (i) one of the number of sets primary windings, or (ii) one of the number of sets secondary windings. The magnetizing AC voltage is such that responsive to the magnetizing AC voltage being provided to one of the sets of primary windings or one of the sets of secondary windings, one or more of the sets of primary windings will be magnetized in a manner wherein a flux of the one or more of the number of primary windings is in phase with the main AC voltage provided from the AC source.

An electrical system (2) includes a transformer (16) coupled to an AC source (6) that provides a main AC voltage, the transformer having a number of sets of primary windings (18) and secondary windings (20), and a charging module (32) structured to generate a magnetizing AC voltage. The charging module is structured to selectively provide the magnetizing AC voltage to: (i) one of the number of sets primary windings, or (ii) one of the number of sets secondary windings. The magnetizing AC voltage is such that responsive to the magnetizing AC voltage being provided to one of the sets of primary windings or one of the sets of secondary windings, one or more of the sets of primary windings will be magnetized in a manner wherein a flux of the one or more of the number of primary windings is in phase with the main AC voltage provided from the AC source.

An apparatus includes a magnetizing circuit configured to be coupled to a transformer and to selectively provide a magnetizing current to the transformer and a control circuit configured to cause the magnetizing circuit to provide the magnetizing current following disconnection of the primary winding of the transformer from the power source. The magnetizing circuit may be configured to provide the magnetizing current from a first source following disconnection of the primary winding from a second source. The transformer may include a first transformer and the apparatus may further include a second, higher impedance transformer coupled between the second source and the first transformer. In further embodiments, the magnetizing circuit may include a solid-state converter.

An apparatus includes a magnetizing circuit configured to be coupled to a transformer and to selectively provide a magnetizing current to the transformer and a control circuit configured to cause the magnetizing circuit to provide the magnetizing current following disconnection of the primary winding of the transformer from the power source. The magnetizing circuit may be configured to provide the magnetizing current from a first source following disconnection of the primary winding from a second source. The transformer may include a first transformer and the apparatus may further include a second, higher impedance transformer coupled between the second source and the first transformer. In further embodiments, the magnetizing circuit may include a solid-state converter.