Abstract: The invention relates to a circuit arrangement for combined protection of a load from temporary and transient overvoltages with emergency operation of the load in the presence of a temporary overvoltage and with integrated follow current limitation, wherein a first surge arrester, in particular a spark gap or a varistor, is provided between network-side input terminals and a second surge arrester, in particular a varistor, is provided between load-side output terminals for follow current limitation. According to the invention, at least one controlled semiconductor switch is provided in each case in the series branch between the input terminal and the output terminal and in the output-side parallel branch, wherein a mechanical switch and a series capacitance are connected in parallel with the semiconductor switch in the series branch.

Abstract: The invention relates to a system for protecting an electrical source or an electrical load, having a module comprising an input and an output, and an electronic safety device for the load that can be connected to the source. The module also comprises a voltage monitoring unit, a current monitoring unit, and semiconductor switching units and controllers associated therewith. According to the invention, in order to selectively apply the protection to the source or the protection to the load, a unit for electrical mirroring on the circuit side is provided so that in the event of source protection, the current monitoring unit is applied at the input end and the voltage monitoring unit is applied at the output end, and in the event of load protection, the voltage monitoring unit is applied at the input end and the current monitoring unit is applied at the output end.

Abstract: Circuit assembly for protecting a unit to be operated from a supply network against surges, comprising an input having a first and a second input connection, which are connected to the supply network, an output to which the unit to be protected can be connected, and a protective circuit which is placed between the first and the second input connections in order to limit the voltage applied thereto, said protective circuit comprising a power semiconductor device. The power semiconductor device includes at least one Zener element between the collector and the gate, or a digital-to-analog converter is placed between the collector and the gate of the power semiconductor device. The protective level of this type of protective circuit can be easily adjusted by setting the clamping voltage for the power semiconductor device.

Abstract: The invention relates to a lightning and overvoltage protection device for data networks, telephony services, electroacoustic installations or bus systems having at least two grid-side input terminals and at least two output terminals, to which the load that is to be protected can be connected, furthermore having a gas-discharge surge arrester that connects the input terminals and an inductance located between the respective input and output terminal. According to the invention, the inductances are configured as current-compensated inductors having a core and a primary winding and a secondary winding, wherein the load current flows through the windings in different directions so that the respective magnetic fields cancel out.

Abstract: The invention relates to an electronic circuit-breaker for a load (RL) that can be connected to a low-voltage dc-voltage network, the circuit-breaker consisting of assemblies provided between input terminals and the load and said assemblies comprising a voltage monitoring unit (TVS1, R1), a current monitoring unit (Shunt, OPV), semiconductor switch units (MOSFET) and controllers (uC) associated therewith. According to the invention, a series circuit consisting of a TVS diode (TVS1) and a resistor (R1) is connected to the input terminals, the resistor having a connection to a first connector (1) of a microcontroller (uC) and the resultant voltage drop at the resistor providing the microcontroller with an overvoltage identification signal if a breakdown voltage is reached at the TVS diode as a result of an overvoltage.

Abstract: The invention relates to a method for sensing lightning-current parameters at installations comprising a plurality of capturing devices and lightning-current diversion paths, in particular for exposed and/or tall buildings, including wind turbines, by using a plurality of sensors on the lightning-current diversion paths to identify a lightning-current event, and comprising subsequent evaluation of the lightning-current event and the effect of the lightning-current event on the particular installation. According to the invention, a lightning-current detection sensor is formed on each of the capturing devices or each lightning-current diversion path, which lightning-current detection sensor provides a yes/no statement concerning a lightning-current event with respect to the particular capturing device or the particular lightning-current diversion path.

Abstract: The invention relates to a circuit arrangement for combined protection of a load from temporary and transient overvoltages with emergency operation of the load in the presence of a temporary overvoltage and with integrated follow current limitation, wherein a first surge arrester, in particular a spark gap or a varistor, is provided between network-side input terminals and a second surge arrester, in particular a varistor, is provided between load-side output terminals for follow current limitation. According to the invention, at least one controlled semiconductor switch is provided in each case in the series branch between the input terminal and the output terminal and in the output-side parallel branch, wherein a mechanical switch and a series capacitance are connected in parallel with the semiconductor switch in the series branch.

Abstract: The invention relates to a lightning and overvoltage protection device for data networks, telephony services, electroacoustic installations or bus systems having at least two grid-side input terminals and at least two output terminals, to which the load that is to be protected can be connected, furthermore having a gas-discharge surge arrester that connects the input terminals and an inductance located between the respective input and output terminal. According to the invention, the inductances are configured as current-compensated inductors having a core and a primary winding and a secondary winding, wherein the load current flows through the windings in different directions so that the respective magnetic fields cancel out.

Abstract: The invention relates to a circuit assembly for protecting a unit to be operated from a supply network against overvoltage, comprising an input having a first and a second input connection, which are connected to the supply network, an output having a first and a second output connection, to which the unit to be protected can be connected, and a protection circuit, which is provided between the first and the second input connections in order to limit the voltage present at the first and the second input connections. According to the invention, the protection circuit has a power semiconductor, in particular an IGBT, wherein a series circuit consisting of a diac, i.e., a bidirectional electrode, and a Zener element is connected between the collector and the gate of the power semiconductor, wherein the sum of the Zener voltage and the diac voltage results in a clamping voltage for the power semiconductor, which lies above the voltage of the supply network and defines the protection level.

Abstract: The invention relates to an electronic circuit-breaker for a load (RL) that can be connected to a low-voltage dc-voltage network, the circuit-breaker consisting of assemblies provided between input terminals and the load and said assemblies comprising a voltage monitoring unit (TVS1, R1), a current monitoring unit (Shunt, OPV), semiconductor switch units (MOSFET) and controllers (uC) associated therewith. According to the invention, a series circuit consisting of a TVS diode (TVS1) and a resistor (R1) is connected to the input terminals, the resistor having a connection to a first connector (1) of a microcontroller (uC) and the resultant voltage drop at the resistor providing the microcontroller with an overvoltage identification signal if a breakdown voltage is reached at the TVS diode as a result of an overvoltage.

Abstract: The invention relates to a method for sensing lightning-current parameters at installations comprising a plurality of capturing devices and lightning-current diversion paths, in particular for exposed and/or tall buildings, including wind turbines, by using a plurality of sensors on the lightning-current diversion paths to identify a lightning-current event, and comprising subsequent evaluation of the lightning-current event and the effect of the lightning-current event on the particular installation. According to the invention, a lightning-current detection sensor is formed on each of the capturing devices or each lightning-current diversion path, which lightning-current detection sensor provides a yes/no statement concerning a lightning-current event with respect to the particular capturing device or the particular lightning-current diversion path.

Abstract: Circuit assembly for protecting a unit to be operated from a supply network against surges, comprising an input having a first and a second input connection, which are connected to the supply network, an output to which the unit to be protected can be connected, and a protective circuit which is placed between the first and the second input connections in order to limit the voltage applied thereto, said protective circuit comprising a power semiconductor device. The power semiconductor device includes at least one Zener element between the collector and the gate, or a digital-to-analog converter is placed between the collector and the gate of the power semiconductor device. The protective level of this type of protective circuit can be easily adjusted by setting the clamping voltage for the power semiconductor device.

Abstract: The invention relates to a circuit assembly for electronically actuating triggerable surge arresters, such as spark gaps, multi-electrode gas arresters, or similar means. At least one power semiconductor is activated by a switching stage upon detecting a surge event, and the output side of the power semiconductor is connected to a trigger input of the surge arrester. According to the invention, the switching stage is designed as a control and analysis unit for detecting transient surge events and has first a pulse detection stage which allows a detection of pulses in a level-sensitive or increase rate-dependent manner and second a microcontroller or similar means for evaluating events. The output side of the microcontroller leads to the control input of the power semiconductor, and a quick-switching rectifier is provided between the output of the power semiconductor and the trigger input of the surge arrester.

Abstract: The invention relates to a circuit assembly for protecting a unit to be operated from a supply network against overvoltage, comprising an input having a first and a second input connection, which are connected to the supply network, an output having a first and a second output connection, to which the unit to be protected can be connected, and a protection circuit, which is provided between the first and the second input connections in order to limit the voltage present at the first and the second input connections. According to the invention, the protection circuit has a power semiconductor, in particular an IGBT, wherein a series circuit consisting of a diac, i.e., a bidirectional electrode, and a Zener element is connected between the collector and the gate of the power semiconductor, wherein the sum of the Zener voltage and the diac voltage results in a clamping voltage for the power semiconductor, which lies above the voltage of the supply network and defines the protection level.