A diagnostic voltage or current path can be used for each MEMS actuator control channel to detect and diagnose faults in the actuator control signal path. Multiple measurement points provide additional capabilities of isolating faults among multiple subassemblies or components in the control signal path. The diagnostic voltage or current path uses ADC(s) and multiplexers to monitor multiple control channels and/or multiple measurement points in each control channel. Digitized voltages, or currents in the case of magnetic actuators, read from the diagnostic ADC are compared to expected values to detect and isolate faults.

A leakage current compensation system may be used in an appliance such as a cooking appliance or another device utilizing a sheathed electrical heating element, and may sense a leakage current in one or more phases of a multi-phase power circuit that supplies the appliance or other device using a current transformer and generate a compensating current in a different phase of the multi-phase power circuit to compensate for the leakage current and thereby reduce the likelihood of a false GFCI trip in the multi-phase power circuit.

A leakage current compensation system may be used in an appliance such as a cooking appliance or another device utilizing a sheathed electrical heating element, and may sense a leakage current in one or more phases of a multi-phase power circuit that supplies the appliance or other device using a current transformer and generate a compensating current in a different phase of the multi-phase power circuit to compensate for the leakage current and thereby reduce the likelihood of a false GFCI trip in the multi-phase power circuit.

A method for impedance measurement of coupled AC transmission lines. The method includes measuring a zero-sequence impedance of a three-phase transmission line that are configured to transmit electric power from a first substation of a power system to a second substation of the power system. Measuring the zero-sequence impedance includes disconnecting the three-phase transmission line from the power system, connecting a receiving end of the first three-phase transmission line to a local ground, connecting each phase of the three-phase transmission line at a sending end of the three-phase transmission line to a terminal node, measuring a zero-sequence current of the first three-phase transmission line, measuring a zero-sequence voltage of the three-phase transmission line, and calculating the zero-sequence impedance based on the zero-sequence current and the zero-sequence voltage.

A method for impedance measurement of coupled AC transmission lines. The method includes measuring a zero-sequence impedance of a three-phase transmission line that are configured to transmit electric power from a first substation of a power system to a second substation of the power system. Measuring the zero-sequence impedance includes disconnecting the three-phase transmission line from the power system, connecting a receiving end of the first three-phase transmission line to a local ground, connecting each phase of the three-phase transmission line at a sending end of the three-phase transmission line to a terminal node, measuring a zero-sequence current of the first three-phase transmission line, measuring a zero-sequence voltage of the three-phase transmission line, and calculating the zero-sequence impedance based on the zero-sequence current and the zero-sequence voltage.

A fault monitoring device may monitor and detect for faults corresponding to a high-side voltage rail, to low-side voltage rail, or internally within a voltage source connected to the high-side voltage rail and the low-side voltage rail. The fault monitoring device may determine sample voltage levels and/or sample resistance values to detect the faults. Also, in various embodiments, the fault monitoring device may perform one or more fault monitoring processes over multiple stages. The fault monitoring device may determine the sample voltage levels and/or the sample resistance values while switching a secondary resistance circuit in different states over the multiple stages.

A fault monitoring device may monitor and detect for faults corresponding to a high-side voltage rail, to low-side voltage rail, or internally within a voltage source connected to the high-side voltage rail and the low-side voltage rail. The fault monitoring device may determine sample voltage levels and/or sample resistance values to detect the faults. Also, in various embodiments, the fault monitoring device may perform one or more fault monitoring processes over multiple stages. The fault monitoring device may determine the sample voltage levels and/or the sample resistance values while switching a secondary resistance circuit in different states over the multiple stages.

A method and a system for fault verification of an electronic device are provided. The electronic device includes a device to-be-verified. The method includes the following. A first power-supply voltage is applied to the electronic device until the device to-be-verified satisfies a material-failure condition. A second power-supply voltage is applied to the electronic device to determine whether the electronic device has safety risk. The first power-supply voltage is higher than the second power-supply voltage, and the safety risk is caused by material failure in the device to-be-verified. The method and the system for fault verification of an electronic device can verify safety risk caused by material failure in internal components of the electronic device.

A method and a system for fault verification of an electronic device are provided. The electronic device includes a device to-be-verified. The method includes the following. A first power-supply voltage is applied to the electronic device until the device to-be-verified satisfies a material-failure condition. A second power-supply voltage is applied to the electronic device to determine whether the electronic device has safety risk. The first power-supply voltage is higher than the second power-supply voltage, and the safety risk is caused by material failure in the device to-be-verified. The method and the system for fault verification of an electronic device can verify safety risk caused by material failure in internal components of the electronic device.

In order to quickly and accurately diagnose the failure of a coupling capacitor of an earth leakage detection device, voltage output unit (11a, OP1) generates a periodically changing periodic voltage and applies the periodic voltage to the other end of coupling capacitor (Cc) via first resistor (R1). Second resistor (R2) and third resistor (R3) are connected in series between a connection point between coupling capacitor (Cc) and first resistor (R1), and a predetermined fixed potential. Voltage measurement unit (11b) measures a voltage at a voltage dividing point between second resistor (R2) and third resistor (R3). Diagnosis unit (11d) determines whether or not coupling capacitor (Cc) is normal based on a voltage measured when switch (MRp, MRm, MRpp) is turned on in a state where voltage output unit (11a, OP1) outputs a fixed voltage.