Abstract: A method and a device for impedance monitoring for a single-phase or multiphase, ungrounded power supply system. The method comprising the following steps: measuring a complex impedance against ground simultaneously for each active conductor using a measuring device; calculating a complex touch current for each active conductor; testing in the computing unit whether the corresponding complex touch current exceeds a settable body-current threshold value; generating a switch signal in the computing unit upon the body-current threshold value being exceeded; and controlling a switch element using the switch signal for shutting off or isolating the power source.

Abstract: A method for controlling a charging apparatus of a vehicle, in particular an electric or hybrid vehicle, wherein the charging apparatus has a charging device including a protection and monitoring device. The vehicle includes a high-voltage on-board power system and an electrical energy storage apparatus connected to the high-voltage on-board power system. The method includes electrically connecting the high-voltage on-board power system to charging connections of an energy supply system by the charging apparatus. The charging connections include a neutral conductor, a protective conductor and at least one phase conductor. A protective conductor resistance is detected between the neutral conductor and the protective conductor by feeding in a test current by the protection and monitoring device. A frequency of the test current is filtered out of the compensation frequency range on a narrowband basis.

Abstract: A method for controlling a charging apparatus of a vehicle, in particular an electric or hybrid vehicle, wherein the charging apparatus has a charging device including a protection and monitoring device. The vehicle includes a high-voltage on-board power system and an electrical energy storage apparatus connected to the high-voltage on-board power system. The method includes electrically connecting the high-voltage on-board power system to charging connections of an energy supply system by the charging apparatus. The charging connections include a neutral conductor, a protective conductor and at least one phase conductor. A protective conductor resistance is detected between the neutral conductor and the protective conductor by feeding in a test current by the protection and monitoring device. A frequency of the test current is filtered out of the compensation frequency range on a narrowband basis.

Abstract: A monitoring device and a method safeguards the function of a type A residual current device (RCD) in a power supply system. The monitoring device includes a measuring current transformer circuit for detecting a DC fault current (IF), an evaluation unit for processing the current detected by the measuring current transformer circuit, and a communication interface connected to the output of evaluation unit. In one embodiment, the monitoring device forms part of an electrical protection device with a type A residual current device (RCD) for ensuring the function of the type A residual current device (RCD).

Abstract: The invention relates to a method and an electrical protection and monitoring device with an insulation monitoring instrument and a differential current monitoring instrument in an electric vehicle for safe driving operation and also for safe charging and energy recovery operation of the electric vehicle at a charging station. The invention further relates to a device for the safe charging and energy recovery operation of an electric vehicle at a charging station with electrical protection and monitoring devices.

Abstract: The invention relates to a method and an apparatus for determining an actual insulation resistance RISO in IT systems grounded with a functional grounding resistance RHRG, comprising constant insulation monitoring. In one embodiment of the invention, the functional grounding resistance RHRG is determined during the initial inspection of the IT system, determining a total insulation resistance Rges is carried out during the constant insulation monitoring, and the actual insulation resistance RISO is determined during the operation of the IT system from the functional grounding resistance RHRG and the total insulation resistance Rges.

Abstract: The invention relates to an insulation monitoring device (IMD) in a non-grounded electrical DC grid (DC-IT System), particularly an electrical photovoltaic system (PV). Said device has a power supply unit (B), which is supplied with electrical energy from the electrical DC grid (DC-IT System). According to the invention a rechargeable energy store (CIMD) is present, in particular a capacitor with a charging diode (D) connected upstream. This is supplied with electrical energy (UIMD) via the electrical DC grid and supplies the power supply unit (B) in the event of a temporary failure of the electrical DC grid, so that continued operation of the insulation monitoring device (IMD) is possible until the non-grounded electrical DC grid is re-established.

Abstract: The invention relates to an insulation monitoring device that forms a measuring circuit with an unearthed IT power supply system for monitoring an insulation resistance, wherein the measuring circuit can be interrupted by a breaker device arranged in the insulation monitoring device. Furthermore, the invention relates to a method for performing an initial and/or repeated test of an insulation resistance in an unearthed IT power supply system and for monitoring the insulation resistance by means of an insulation monitoring device. For performing the initial and/or repeated test, the measuring circuit is interrupted by way of a manual switching act that activates a breaker device arranged in the insulation monitoring device.

Abstract: The invention relates to a power charging device (10) for an electric vehicle (12) with an electric energy store (14). The power charging device (10) comprises at least one rectifier means (16) for converting a supply voltage (18) into a charging d.c. voltage (20), a contacting means (22) for contacting a plug-in connection supply point (24) of the electric vehicle (12), and a residual current monitoring device (26) for detecting a current difference in the contacting means (22) and/or the electric vehicle (12) during a charging process of the energy store (14) of the electric vehicle (12). The invention is characterized in that the residual current monitoring device (26) is designed at least for detection of a direct current difference ?I and comprises a cutoff element (28) which can interrupt the charging process when a predeterminable direct current cutoff difference (36) is exceeded over a predeterminable cutoff time.

Abstract: The invention relates to a method and an electrical protection and monitoring device with an insulation monitoring instrument and a differential current monitoring instrument in an electric vehicle for safe driving operation and also for safe charging and energy recovery operation of the electric vehicle at a charging station. The invention further relates to a device for the safe charging and energy recovery operation of an electric vehicle at a charging station with electrical protection and monitoring devices.

Abstract: The invention relates to a method and an apparatus for determining an actual insulation resistance RISO in IT systems grounded with a functional grounding resistance RHRG, comprising constant insulation monitoring. In one embodiment of the invention, the functional grounding resistance RHRG is determined during the initial inspection of the IT system, determining a total insulation resistance Rges is carried out during the constant insulation monitoring, and the actual insulation resistance RISO is determined during the operation of the IT system from the functional grounding resistance RHRG and the total insulation resistance Rges.

Abstract: A monitoring device and a method safeguards the function of a type A residual current device (RCD) in a power supply system. The monitoring device includes a measuring current transformer circuit for detecting a DC fault current (IF), an evaluation unit for processing the current detected by the measuring current transformer circuit, and a communication interface connected to the output of evaluation unit. In one embodiment, the monitoring device forms part of an electrical protection device with a type A residual current device (RCD) for ensuring the function of the type A residual current device (RCD).

Abstract: The invention relates to a method and an electrical protection and monitoring device with an insulation monitoring instrument and a differential current monitoring instrument in an electric vehicle for safe driving operation and also for safe charging and energy recovery operation of the electric vehicle at a charging station. The invention further relates to a device for the safe charging and energy recovery operation of an electric vehicle at a charging station with electrical protection and monitoring devices.

Abstract: The invention relates to an insulation monitoring device (IMD) in a non-grounded electrical DC grid (DC-IT System), particularly an electrical photovoltaic system (PV). Said device has a power supply unit (B), which is supplied with electrical energy from the electrical DC grid (DC-IT System). According to the invention a rechargeable energy store (CIMD) is present, in particular a capacitor with a charging diode (D) connected upstream. This is supplied with electrical energy (UIMD) via the electrical DC grid and supplies the power supply unit (B) in the event of a temporary failure of the electrical DC grid, so that continued operation of the insulation monitoring device (IMD) is possible until the non-grounded electrical DC grid is re-established.

Abstract: The invention relates to a power charging device (10) for an electric vehicle (12) with an electric energy store (14). The power charging device (10) comprises at least one rectifier means (16) for converting a supply voltage (18) into a charging d.c. voltage (20), a contacting means (22) for contacting a plug-in connection supply point (24) of the electric vehicle (12), and a residual current monitoring device (26) for detecting a current difference in the contacting means (22) and/or the electric vehicle (12) during a charging process of the energy store (14) of the electric vehicle (12). The invention is characterised in that the residual current monitoring device (26) is designed at least for detection of a direct current difference ?I and comprises a cutoff element (28) which can interrupt the charging process when a predeterminable direct current cutoff difference (36) is exceeded over a predeterminable cutoff time.