An anomaly detection device for a power supply system includes: a first power supply unit; a second power supply unit; a first conductive path and a second conductive path for transmitting electric power between the first power supply unit and the second power supply unit; and a relay for controlling current through the first conductive path and the second conductive path. The anomaly detection device includes: a first voltage detector for detecting a first voltage on the first power supply unit side of the first and the second conductive paths relative to the relay; a second voltage detector for detecting a second voltage on the second power supply unit side of the first and second conductive paths relative to the relay; and a detector for detecting an anomaly based on the first voltage and the second voltage when the relay is in a cut-off state.

In a method and to a corresponding device for detecting phase failures in a converter, current regulators of a positive phase sequence system and current regulators of a negative phase sequence system are provided for the current control of the converter, wherein the current regulators of the positive phase sequence system and the current regulators of the negative phase sequence system each have an integrator, resulting, in the case of a network fault, in coupling of the integrators. At least one measured or calculated value is checked by a monitoring unit for a course that is typical of the coupling of the integrators, wherein the monitoring unit generates a fault signal if such a typical course is detected.

A method and apparatus for identifying an open phase of a circuit breaker on the basis of voltage. The method comprises: a protection apparatus measures three-phase voltages at two sides of a circuit breaker; respectively calculates a vector difference and an effective value of the voltages at two sides of the circuit breaker; when the phase voltages at two sides are both greater than 80% to 90% of a rated voltage, and the voltage vector difference at two sides of the one-phase or two-phase circuit breaker is greater than a set voltage, it is determined that the circuit breaker has an open phase; and actuates an alarming or tripping operation after a short time delay t.

The invention relates to a space-limited protection module with at least two overvoltage protection elements in parallel current branches, wherein the protection module comprises a local multistage indicator for indicating at least one operating state, a warning state and a defect state, wherein the parallel switched overvoltage protection elements are arranged on a circuit board in electrical connection to conductor tracks of the circuit board and attached in a thermally softenable manner, wherein the first overvoltage protection element is associated with a first force accumulator and the second overvoltage protection element is associated with a second force accumulator, which in the soldered state exerts a force on the respective overvoltage protection element in parallel with the surface of the circuit board, so that in the event of a heating of an overvoltage protection element beyond the softening point of the thermal adhesion the respective overvoltage protection element is displaced sideways, so that an electrical connection to the conductor tracks of the circuit board is interrupted, wherein an interruption of the electrical connection of the second overvoltage protection element is always signaled as a defect state while the interruption of just the electrical connection of the first overvoltage protection element is signaled as a warning state.

The invention relates to a space-limited protection module with at least two overvoltage protection elements in parallel current branches, wherein the protection module comprises a local multistage indicator for indicating at least one operating state, a warning state and a defect state, wherein the parallel switched overvoltage protection elements are arranged on a circuit board in electrical connection to conductor tracks of the circuit board and attached in a thermally softenable manner, wherein the first overvoltage protection element is associated with a first force accumulator and the second overvoltage protection element is associated with a second force accumulator, which in the soldered state exerts a force on the respective overvoltage protection element in parallel with the surface of the circuit board, so that in the event of a heating of an overvoltage protection element beyond the softening point of the thermal adhesion the respective overvoltage protection element is displaced sideways, so that an electrical connection to the conductor tracks of the circuit board is interrupted, wherein an interruption of the electrical connection of the second overvoltage protection element is always signaled as a defect state while the interruption of just the electrical connection of the first overvoltage protection element is signaled as a warning state.

A GFCI includes a latch assembly provided with a rigid electrically conducting bar connected thereto such that when a user presses a reset button the latch assembly is moved toward a pair of contacts provided as part of a reset circuit to initiate a reset operation. When the electrically conducting bar on the latch assembly connects the pair of contacts, the reset circuit is closed and an actuator is activated to place the GFCI device in the latched, reset, condition. If the GFCI device is correctly wired, the latch assembly enters the latched state. If the device is not properly wired no power is provided to the actuator and the device remains in the tripped, or open, state.

A GFCI includes a latch assembly provided with a rigid electrically conducting bar connected thereto such that when a user presses a reset button the latch assembly is moved toward a pair of contacts provided as part of a reset circuit to initiate a reset operation. When the electrically conducting bar on the latch assembly connects the pair of contacts, the reset circuit is closed and an actuator is activated to place the GFCI device in the latched, reset, condition. If the GFCI device is correctly wired, the latch assembly enters the latched state. If the device is not properly wired no power is provided to the actuator and the device remains in the tripped, or open, state.

Disclosed is a discontinuous jump current breaker, in an AC power system having an insulating material that exhibits nonlinear electrical characteristics between two electrodes, which blocks an AC power by observing a discontinuous jump current in which an insulator-metal transition occurs. The discontinuous jump current breaker includes a setting unit that sets the magnitude of a discontinuous jump current, a sensor unit including a metallic wire (Republic of Korea Patent Registration No. 10-1981640) parallel to an AC power wire, located at a separation distance d?0, and that measures electromagnetic waves of an AC power, an amplifier unit that amplifies an analog signal of the metal wire, an analog-to-digital converter that converts the amplified analog signal to digital, a microcontroller unit including a memory unit for storing a program that drives the system, and a power blocking unit that blocks the discontinuous jump current.

The present disclosure pertains to detection of abnormal, risky, or aberrant conditions in a power distribution network and to corresponding trip signals being used to trip open devices such as reclosers upstream of where the abnormal condition is detected. Detection of open phase on a distribution circuit prevents severed conductors from causing a ground fault, therefore avoiding the possibility of fire and dangerous conditions. The voltage unbalance may be measured using an end of line relay that includes an electrical sensor or relay, a tripping mechanism, and a signal transmitter.

The present disclosure pertains to detection of abnormal, risky, or aberrant conditions in a power distribution network and to corresponding trip signals being used to trip open devices such as reclosers upstream of where the abnormal condition is detected. Detection of open phase on a distribution circuit prevents severed conductors from causing a ground fault, therefore avoiding the possibility of fire and dangerous conditions. The voltage unbalance may be measured using an end of line relay that includes an electrical sensor or relay, a tripping mechanism, and a signal transmitter.