Method for controlling a direct current switch, direct current switch, and DC voltage system
First Claim
1. A method for controlling direct current switch, in particular a fault current switch or a circuit-breaker, with the direct current switch having first and second semiconductor switches capable of being switched off, said method comprising:
- arranging the first and second semiconductor switches between first and second terminals to enable conduction of a current with a first polarity through the first semiconductor switch and conduction of the current with a second polarity that is opposite to the first polarity through the second switch;
switching off one of the first and second semiconductor switches as a function of a current measurement value;
registering a further current measurement value at a point at which a return current associated with the current measurement value is assumed;
forming a difference between the current measurement value and the further current measurement value; and
switching off the one of the first and second semiconductor switches, when an amount of the difference is exceeded.
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Accused Products
Abstract
In a method for controlling a direct current switch having first and second semiconductor switches capable of being switched off, the first and second semiconductor switches are arranged between first and second terminals to enable conduction of a current with a first polarity through the first semiconductor switch and conduction of the current with a second polarity that is opposite to the first polarity through the second semiconductor switch. One of the first and second semiconductor switches is switched off as a function of a current measurement value.
5 Citations
19 Claims
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1. A method for controlling direct current switch, in particular a fault current switch or a circuit-breaker, with the direct current switch having first and second semiconductor switches capable of being switched off, said method comprising:
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arranging the first and second semiconductor switches between first and second terminals to enable conduction of a current with a first polarity through the first semiconductor switch and conduction of the current with a second polarity that is opposite to the first polarity through the second switch; switching off one of the first and second semiconductor switches as a function of a current measurement value; registering a further current measurement value at a point at which a return current associated with the current measurement value is assumed; forming a difference between the current measurement value and the further current measurement value; and switching off the one of the first and second semiconductor switches, when an amount of the difference is exceeded. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A direct current switch, comprising:
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first and second terminals; first and second semiconductor switches capable of being switched off and arranged between the first and second terminals to enable conduction of a current with a first polarity through the first semiconductor switch and conduction of the current with a second polarity that is opposite to the first polarity through the second semiconductor switch; a local control device configured to switch off the current through the direct current switch as a function of a current measurement value by switching off one of the first and second semiconductor switches; and a current measurement device configured to register a further current measurement value at a point at which a return current associated with the current measurement value is assumed, wherein the local control device is configured to form a difference between the current measurement value and the further current measurement value end to switch off the one of the first and second semiconductor switches, when an amount of the difference is exceeded. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A DC voltage system, comprising:
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an energy source having a DC voltage; an electric load having a DC voltage connection; and a direct current switch connected to the energy source and the electric load, said direct current switch comprising first and second terminals, first and second semiconductor switches capable of being switched off and arranged between the first and second terminals to enable conduction of a current with a first polarity through the first semiconductor switch and conduction of the current with a second polarity that is opposite to the first polarity through the second semiconductor switch, and a local control device configured to switch off the current through the direct current switch as a function of a current measurement value by switching off one of the first and second semiconductor switches, and a current measurement device configured to register a further current measurement value at a point at which a return current associated with the current measurement value is assumed, wherein the local control device is configured to form a difference between the current measurement value and the further current measurement value and, to switch off the one of the first and second semiconductor switches, when an amount of the difference is exceeded.
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Specification