Protection of an AC device
AssigneeHSP Hochspannungsgeräte GmbH
InventorUdo Prucker
Life of this patent
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Abstract
A protection device protects an AC device, in particular an inductive voltage converter, electrically connected to an AC line, from damage caused by direct currents flowing in the AC line. In this case, at least one current transfer coil, which runs around a magnetic core section of a magnetic core, is connected to the AC line in parallel with the AC device.
Claims12
A protection device for an AC device having a device core and a winding electrically connected to an AC line, the protection device comprising:
- at least one current drain coil separate from the AC device and connected to the AC line in parallel with the AC device;
- and
- a magnetic core separate from the device core and having a first magnetic core section, said at least one current drain coil wraps around said first magnetic core section.
A method for protecting an AC device having a device core and a winding electrically connected to an AC line against damage as a result of DC currents flowing in the AC line, which comprises the step of:
- providing a protection device containing at least one current drain coil and a magnetic core having a first magnetic core section, said at least one current drain coil wraps around said first magnetic core section the at least on magnetic core and the current drain coil being separate from the AC device;
- and
- electrically connecting the at least one current drain coil of the protection device to the AC line in parallel with the AC device.
A measuring configuration for measuring an AC voltage on an AC line, the measuring configuration comprising:
- an inductive voltage transformer having a primary winding with a first primary winding end being electrically connectable to the AC line;
- at least one protection device containing at least one current drain coil and a magnetic core having a first magnetic core section, said at least one current drain coil wraps around said first magnetic core section and
- said at least one current drain coil of said at least one protection device is connected in parallel with said primary winding of said voltage transformer, said at least one current drain coil having a lower effective electrical resistance than said primary winding of said voltage transformer.
A power transmission system, comprising:
- a DC line;
- an AC line running adjacent to said DC line;
- and
- a measuring configuration for measuring an AC voltage on said AC line, said measuring configuration containing:
- an inductive voltage transformer having a primary winding with a first primary winding end electrically connected to said AC line;
- at least one protection device containing at least one current drain coil and a magnetic core having a first magnetic core section, said at least one current drain coil wraps around said first magnetic core section and
- said at least one current drain coil of said at least one protection device is connected in parallel with said primary winding of said voltage transformer, said at least one current drain coil having a lower effective electrical resistance than said primary winding of said voltage transformer.
A method of using a power transmission system, which comprises the steps of:
- providing a power transmission system containing a DC line, an AC line running adjacent to the DC line and a measuring configuration for measuring an AC voltage on the AC line, the measuring configuration containing:
- an inductive voltage transformer having a primary winding with a first primary winding end electrically connected to the AC line;
- at least one protection device containing at least one current drain coil and a magnetic core having a first magnetic core section, said at least one current drain coil wraps around said first magnetic core section and
- the at least one current drain coil of the at least one protection device is connected in parallel with the primary winding of the voltage transformer, the at least one current drain coil having a lower effective electrical resistance than the primary winding of the voltage transformer;
- and
- using the power transmission system for a high-voltage direct current transmission via the DC line.
Dependencies are inferred from the claim text.