A system includes a plurality of field devices electrically connected to a feed-in device configured to provide an electrical energy supply to the field devices. The feed-in device has a monitoring device configured to detect spark generation in the energy supply and, based on this, to switch off the electrical energy supply. The field devices each have an input terminal for connecting a supply line. At least one field device is configured for electrical energy supply to at least one subsequent field device, and for monitoring. The monitoring field device has at least one output terminal for connecting a further supply line, via which the electrical energy can be forwarded to the subsequent field device. The monitoring field device has a monitoring device configured to detect spark generation in the energy supply to the subsequent field device and, based on this, to switch off the electrical energy supply.

There are provided a device for preventing an entire cabinet from being powered down, a cabinet, and a method for preventing an entire cabinet from being powered down. The device includes a diode and a first protection circuit. An anode of the diode is grounded, a cathode of the diode is connected to an external voltage supplying copper busbar via the first protection circuit, and the diode is connected in parallel with an external node. The first protection circuit is arranged to monitor a current flowing through the diode, and cut off a connection line between the diode and the voltage supplying copper busbar in a case that the current exceeds a preset fusing current threshold.

It is an object to provide an electric vehicle charging monitoring device and an electric vehicle charging monitoring method. According to an embodiment, a device comprises: a current measurement device configured to measure an electrical current flowing from an electrical input to an electrical output and a computing device electrically coupled to the current measurement device, configured to: monitor a number of charging sessions based on the electrical current flow from the electrical input to the electrical output; compare the number of charging sessions to a first preconfigured value; and detect abnormal current flow based on the charging session comparison. A device, a method, and a computer program product are provided.

A wireless electric vehicle charging system comprises base-side equipment for generating a magnetic field and vehicle-side equipment for receiving energy via the magnetic field to supply power to a vehicle-driving battery. Monitoring circuitry monitors one or more of voltage, current, or phase associated with the base-side equipment and halts generation of the magnetic field in response to a change in the voltage, current, or phase associated with the operation of the base-side equipment that indicates a fault condition at the vehicle-side equipment, which may include a loss of power or disconnection of a battery. Based on detection of the change, the monitoring circuitry can halt generation of the magnetic field to prevent damage at the vehicle-side equipment.

A load protection and control apparatus (1) for protecting and controlling an electrical load connected to the load protection and control apparatus (1) comprising an overcurrent protection circuit (1A) having a power switch (5) through which the electrical load receives an electrical load current (I.sub.L) and having a sensor component (4) connected in series with the power switch (5) and adapted to generate directly a voltage drop (ΔU.sub.4) corresponding to the current rise speed of the electrical load current (I.sub.L) flowing from an input terminal (2) of the load protection and control apparatus (1) via the sensor component (4) and the power switch (5) to the output terminal (3) and having a driver circuit (6) adapted to detect an occurring overcurrent depending on the voltage drop (ΔU.sub.4) generated by the sensor component (4) and/or depending on a voltage drop (ΔU.sub.5) along the power switch (5) and adapted to switch off said power switch (5) upon detection of an overcurrent within a switch-off period of less than one millisecond; and/or comprising a power supply control circuit (10) having a sensor component (9) adapted to measure at the input terminal (2) a supply voltage (U) notified to a control unit (8) of the load protection and control apparatus (1) adapted to control an electrical power supplied to the electrical load, wherein each input terminal (2) is configured to establish an electrical connection with a busbar (14) of a busbar system or with a current carrying wire.

Systems, methods, and computer-readable media are disclosed for impedance-based broken conductor detection in electric distribution systems. Upon the detection of a broken conductor, the affected overhead line will be de-energized before it hits the ground. An example method may include determining, during a first time period, a first impedance value measured by a first IED, and may further include determining, during a second time period that after the first time period, a second impedance value measured by the first IED. The method may further include determining a first ratio based on dividing a difference between the first impedance value and the second impedance value by the first impedance value, and may further include determining that the first ratio deviates from a threshold setpoint, and determining that a broken conductor condition occurs based on the first ratio deviating from the threshold setpoint.

A load control apparatus (1) for controlling a power supply to an electrical load connected to an output terminal (3) of the load control apparatus (1) comprising: an overcurrent protection circuit (1A) having a power switch (5) through which the electrical load receives an electrical load current (I.sub.L) and having a sensor component (4) connected in series with the power switch (5) and adapted to generate directly a voltage drop (ΔU.sub.4) corresponding to the current rise speed of the electrical load current (I.sub.L) flowing from an input terminal (2) of the load control apparatus (1) via the sensor component (4) and the power switch (5) to the output terminal (3) and having a driver circuit (6) adapted to detect an occurring overcurrent depending on the voltage drop (ΔU.sub.4) generated by the sensor component (4) and/or a voltage drop (ΔU.sub.5) along the power switch (5) and adapted to switch off said power switch (5) upon detection of an overcurrent within a switch-off period of less than one millisecond; and/or comprising a power supply control circuit (1C) having a sensor component (9) adapted to measure at the input terminal (2) a supply voltage notified to a control unit (8) of the load control apparatus (1) adapted to control an electrical power supplied to the electrical load.

A load protection apparatus for protecting an electrical load connected to an output terminal (3) of the load protection apparatus (1) against overcurrent, said apparatus (1) comprising: an overcurrent protection circuit (1A) having a power switch (5) through which the electrical load receives an electrical load current (I.sub.L) via the output terminal (3) and having a sensor component (4) connected in series with the power switch (5) and adapted to generate directly a voltage drop (ΔU.sub.4) corresponding to the current rise speed of the electrical load current (I.sub.L) flowing from an input terminal (2) of the load control apparatus (1) via the sensor component (4) and the power switch (5) to the output terminal (3) and having a driver circuit (6) adapted to detect an occurring overcurrent depending on the voltage drop (ΔU.sub.4) generated by the sensor component (4) and depending on a voltage drop (ΔU.sub.5) along the power switch (5) adapted to switch off said power switch (5) upon detection of an overcurrent within a switch-off period.

An overcurrent and/or short-circuit detector includes: at least one current sensor for picking up a current signal which has a predeterminable time resolution in at least one electrical current path; and at least one evaluation unit. The at least one evaluation unit: determines a first point in time of a predeterminable steep increase in the current signal, forms a temporal integral of current values of the current signal from the first point in time to a second point in time, compares a pair of values, including a relevant value of the integral and the relevant value of the current signal, with at least one predeterminable limiting condition at predeterminable temporal intervals substantially continuously, and emits an overcurrent and/or short-circuit signal to an outlet of the overcurrent and/or short-circuit detector if the pair of values exceeds a limiting condition.

Methods, systems, and devices for protecting a wireless power transfer system. One aspect features a sensor network for a wireless power transfer system. The sensor network includes a differential voltage sensing circuit and a current sensing circuit. The differential voltage sensing circuit is arranged within a wireless power transfer system to measure a rate of change of a voltage difference between portions of an impedance matching network and generate a first signal representing the rate of change of the voltage difference. The current sensing circuit is coupled to the differential voltage sensing circuit and configured to calculate, based on the first signal, a current through a resonator coil coupled to the wireless power transfer system.