US 6,788,034 B2 · Method for operating a transformer from a drivable voltage source, as well as an apparatus for carrying out the method

Abstract

A method is specified for operating a transformer (1) from a drivable voltage source (2), in which the voltage source, (2) produces an output voltage (uA) for feeding active power and/or a reactive component via the transformer (1) into an electrical AC voltage supply network (3), and an output current (iA) from the voltage source (2) is monitored for a maximum permissible value (iAmax) in which the magnetic flux (φ) of the transformer (1) is determined continuously, and, when the maximum permissible value (iAmax) of the output current (iA) is exceeded, the voltage source (2) is disconnected from the transformer (1). In response to a start signal (SS), an output voltage (uA) is formed as a function of a transformer voltage (uTX), which was determined most recently before the maximum permissible value (iAmax) of the output current (iA) was exceeded, and as a function of a first magnetic flux (φ1), which was determined most recently before the maximum permissible value (iAmax) of the output current (iA) was exceeded, and of a second magnetic flux (φ2) determined at the time of the start signal (SS), the output voltage (uA) being applied to the transformer (1) for an adjustable time period (T0) after an adjustable switching time (t0). An apparatus is also specified for carrying out the method.

Claims22

Dependent claims

A method for operating a transformer from a drivable voltage source, in which the voltage source is driven by means of drive signals (Sa) and produces an output voltage (uA) for feeding active power and/or a reactive component via the transformer into an electrical AC voltage supply network, with an output current (iA) from the voltage source being monitored for a maximum permissible value (iAmax), wherein a transformer voltage (uT) which is applied to the transformer is determined continuously, in that the magnetic flux (φ) of the transformer is determined continuously, in that, when the maximum permissible value (iAmax) of the output current (iA) is exceeded, the voltage source is driven such that the voltage source is disconnected from the transformer,

in that, in response to a start signal (SS), an output voltage (uA) is formed as a function of a transformer voltage (uTX), which was determined most recently before the maximum permissible value (iAmax) of the output current (iA) was exceeded, and as a function of a first magnetic flux (φ1), which was determined most recently before the maximum permissible value (iAmax)o the output current (iA) was exceeded, and of a second magnetic flux (φ2) determined at the time of the start signal (SS),
and in that the voltage source is driven such that the output voltage (uA) is applied to the transformer for an adjustable time period (T0) after an adjustable switching time (t0).

An apparatus for carrying out a method for operating a transformer from a drivable voltage source having a drive device which is used for driving the voltage source, with the voltage source producing an output voltage (uA), in accordance with the drive, for feeding active power and/or a reactive component via the transformer into an electrical AC voltage supply network, wherein a first monitoring device is provided for monitoring an output current (iA) from the voltage source for a maximum permissible value (iAmax) and is connected on the input side to the drive device, in that first means are provided for continuously determining a transformer voltage (uT) which is applied to the transformer,

in that a reference signal generator is provided, which has second means for continuously determining the magnetic flux (φ) of the transformer and which is connected on the input side to the first means and on the output side to the drive device, with the reference signal generator being designed such that, in response to a start signal (SS) which is supplied to the reference signal generator, an output voltage reference signal (uAref) which corresponds to the output voltage (uA) is formed as a function of a transformer voltage (uTX), which was determined most recently before the maximum permissible value (iAmax) of the output current (iA) was exceeded, and as a function of a first magnetic flux (φ1) which was determined most recently before the maximum permissible value (iAmax) of the output current (iA) was exceeded, and of a second magnetic flux (φ2) determined at the time of the start signal (SS),
and in that the reference signal generator has an enable switching device, to which the output voltage reference signal (uAref), an adjustable switching time (t0) and an adjustable time period (T0) are supplied in order to enable the output voltage reference signal (uAref) at the output of the reference signal generator.

Dependencies are inferred from the claim text.

Method for operating a transformer from a drivable voltage source, as well as an apparatus for carrying out the method

Life of this patent

Method for operating a transformer from a drivable voltage source, as well as an apparatus for carrying out the method

Life of this patent

Abstract

Claims22