Disclosed herein are a variety of systems and methods related to detection of a cross-country fault in an electrical power system. In one embodiment, a system consistent with the present disclosure may be configured to monitor electrical parameters in the electrical power system. The system may determine when a voltage magnitude of one phase exceeds a first voltage threshold. The one phase that exceeds the first voltage threshold may be identified as an un-faulted phase. The system may further be configured to determine that the voltage magnitude of the un-faulted phase exceeds a second threshold based on a zero-sequence voltage. The system may further be configured to determine that a phase angle between the un-faulted phase and the zero-sequence voltage is within a range. A protective action to clear the cross-country fault condition may be implemented upon identification of a cross-country fault.

A quick-action leakage detection protection circuit with a regular self-checking function is provided. The quick-action leakage detection protection circuit may include a power input end, a power load end, a power user end, twin induction coils for detecting leakage current and low resistance failure, a control chip, a trip coil in which an iron core is disposed, a reset button, a self-checking chip, and a self-checking silicon controlled rectifier. The reset button may be linked with a main circuit switch, an analog path switch, and a normally-open self-checking path switch. The main circuit switch may include a pair of dynamic contact levers extended from the power load end, a first pair of static contact ends extended from the power input end passing through the twin induction coils, and a second pair of static contact ends extended from the power user end. In some embodiments, a first end of the trip coil may be connected to a live line end of the power input end and to the live line of the power load end via the first normally-closed switch. And, a second end of the trip coil may be connected to a neutral line end of the power load end via a second normally-closed switch.

A quick-action leakage detection protection circuit with a regular self-checking function is provided. The quick-action leakage detection protection circuit may include a power input end, a power load end, a power user end, twin induction coils for detecting leakage current and low resistance failure, a control chip, a trip coil in which an iron core is disposed, a reset button, a self-checking chip, and a self-checking silicon controlled rectifier. The reset button may be linked with a main circuit switch, an analog path switch, and a normally-open self-checking path switch. The main circuit switch may include a pair of dynamic contact levers extended from the power load end, a first pair of static contact ends extended from the power input end passing through the twin induction coils, and a second pair of static contact ends extended from the power user end. In some embodiments, a first end of the trip coil may be connected to a live line end of the power input end and to the live line of the power load end via the first normally-closed switch. And, a second end of the trip coil may be connected to a neutral line end of the power load end via a second normally-closed switch.

A ground fault circuit interrupter (GFCI), with Capacitive Power Supply Circuit, for interrupting the flow of current through a pair of lines extending between a source of power and a load when a around fault condition is detected.

A power supply includes an I/O module configured to receive a high voltage DC input and output a high voltage DC, a plurality of DC converter modules configured to receive the high voltage DC output from the I/O module and output a low voltage DC output, and a plurality of AC inverter modules configured to receive the high voltage DC output from the I/O module and output a high voltage AC output. Each of the plurality of DC converter modules, each of the plurality of AC inverter modules and the I/O module may be mounted in a corresponding individual chassis. Each of the individual chassis may be configured to be stackable together into a single line replaceable unit (LRU). Each of the individual chassis may have an identically shaped outer frame.

A power supply includes an I/O module configured to receive a high voltage DC input and output a high voltage DC, a plurality of DC converter modules configured to receive the high voltage DC output from the I/O module and output a low voltage DC output, and a plurality of AC inverter modules configured to receive the high voltage DC output from the I/O module and output a high voltage AC output. Each of the plurality of DC converter modules, each of the plurality of AC inverter modules and the I/O module may be mounted in a corresponding individual chassis. Each of the individual chassis may be configured to be stackable together into a single line replaceable unit (LRU). Each of the individual chassis may have an identically shaped outer frame.

Method and system for performing arc fault and ground fault detection in a dual function CAFI/GFCI circuit breaker uses two analog-to-digital converters (ADC), one for performing arc fault sampling and one for performing ground fault sampling. Each ADC operates independently of the other ADC and may be accessed as needed by the microcontroller without interfering with the operation of the other ADC. Such simultaneous use of multiple ADCs minimizes or eliminates the need for complex time slicing and similar control schemes, thus freeing up the microcontroller for other operations and fault detection related tasks.

Method and system for performing arc fault and ground fault detection in a dual function CAFI/GFCI circuit breaker uses two analog-to-digital converters (ADC), one for performing arc fault sampling and one for performing ground fault sampling. Each ADC operates independently of the other ADC and may be accessed as needed by the microcontroller without interfering with the operation of the other ADC. Such simultaneous use of multiple ADCs minimizes or eliminates the need for complex time slicing and similar control schemes, thus freeing up the microcontroller for other operations and fault detection related tasks.

A device for protecting a medium or high voltage electrical network is provided, including a base part connected to means for measuring values representative of the electrical network and to a trip circuit of the electrical network, an active part that includes means for analogue-digital conversion of the values representative of the electrical network and which is mechanically and electrically connected to the base part in a first position referred to as the normal position, and a removable test part that is mechanically and electrically connected to the active part in a second position referred to as the test position. The test part includes means for mechanically and electrically connecting to the base part such that, in the test position, external terminals of the test part are connected to the trip circuit through the base part.

A device for protecting a medium or high voltage electrical network is provided, including a base part connected to means for measuring values representative of the electrical network and to a trip circuit of the electrical network, an active part that includes means for analogue-digital conversion of the values representative of the electrical network and which is mechanically and electrically connected to the base part in a first position referred to as the normal position, and a removable test part that is mechanically and electrically connected to the active part in a second position referred to as the test position. The test part includes means for mechanically and electrically connecting to the base part such that, in the test position, external terminals of the test part are connected to the trip circuit through the base part.