A terminal supporting leakage detection and a detection method for performing leakage detection for the terminal is provided, the terminal may include: a first conductive unit, a second conductive unit, a first access end, and a second access end, wherein the first access end is configured to be connected to a ground line of a main board of the terminal through the first conductive unit and used to access a ground line of an external leakage detection apparatus, and the second access end is configured to be connected inside the terminal to a metal portion of a outer casing of the terminal through the second conductive unit and used to access a leakage test line of the leakage detection apparatus.

A terminal supporting leakage detection and a detection method for performing leakage detection for the terminal is provided, the terminal may include: a first conductive unit, a second conductive unit, a first access end, and a second access end, wherein the first access end is configured to be connected to a ground line of a main board of the terminal through the first conductive unit and used to access a ground line of an external leakage detection apparatus, and the second access end is configured to be connected inside the terminal to a metal portion of a outer casing of the terminal through the second conductive unit and used to access a leakage test line of the leakage detection apparatus.

Arrangements and methods for identifying a phase-to-ground inverter short circuit in an IT (isolé-terre or isolated ground) network are provided. In the method, AC current values of all three phases and DC current values are measured and evaluated at a frequency that is higher than the clock frequency of the inverter. An AC short-circuit current is also identified by subtracting the fundamental wave from the AC current sensor values. An AC component of the DC current sensor value is also identified, and it is identified whether this component is higher than a value predefined for regular operation. The AC short-circuit current and the AC component of the DC current sensor value are also compared. A short circuit is identified for the phase if the two values of the AC short-circuit current and the AC component of the DC current sensor value are approximately equal.

Arrangements and methods for identifying a phase-to-ground inverter short circuit in an IT (isolé-terre or isolated ground) network are provided. In the method, AC current values of all three phases and DC current values are measured and evaluated at a frequency that is higher than the clock frequency of the inverter. An AC short-circuit current is also identified by subtracting the fundamental wave from the AC current sensor values. An AC component of the DC current sensor value is also identified, and it is identified whether this component is higher than a value predefined for regular operation. The AC short-circuit current and the AC component of the DC current sensor value are also compared. A short circuit is identified for the phase if the two values of the AC short-circuit current and the AC component of the DC current sensor value are approximately equal.

The short-circuit detection device according to the present disclosure includes: a signal acquisition unit configured to acquire, from a magnetic flux detector configured to detect a magnetic flux generated in a gap between a rotor and a stator of a rotary electric machine, one detected signal based on the magnetic flux and set the one detected signal as a first detected signal and a second detected signal; a signal processing unit configured to perform frequency analysis on the first detected signal, and generate and decode a voltage signal simulating a voltage state assumed in a normal case; and a signal comparison unit configured to perform comparison between a decoded signal obtained through the decoding by the signal processing unit and the second detected signal transmitted from the signal acquisition unit, to detect a short-circuit in a field winding of the rotary electric machine.

The short-circuit detection device according to the present disclosure includes: a signal acquisition unit configured to acquire, from a magnetic flux detector configured to detect a magnetic flux generated in a gap between a rotor and a stator of a rotary electric machine, one detected signal based on the magnetic flux and set the one detected signal as a first detected signal and a second detected signal; a signal processing unit configured to perform frequency analysis on the first detected signal, and generate and decode a voltage signal simulating a voltage state assumed in a normal case; and a signal comparison unit configured to perform comparison between a decoded signal obtained through the decoding by the signal processing unit and the second detected signal transmitted from the signal acquisition unit, to detect a short-circuit in a field winding of the rotary electric machine.

The invention relates to an electric circuit arrangement (2) for standard insulation monitoring with emergency shut-down for an ungrounded power supply system (4) upon detection of a ground fault, having a standard insulation monitoring device (10) which is coupled to an active conductor (L1, L2, L3) of the power supply system (4) on the network side via a coupling branch (12) each or to a neutral point (S) of the power supply system (4) via a coupling branch (12) and is connected to ground (PE) on the ground side via a ground connection branch (14). The electric circuit arrangement (2) comprises an AC/DC sensitive measuring current transformer (20) which detects a fault current on the network side at the active conductors (L1, L2, L3) in the coupling branches (12) or at the neutral point (S) in the coupling branch (12) or on the ground side in the ground connection branch (14) of the insulation monitoring device (10); an evaluator (30) for evaluating the fault current with regard to a fault current threshold being exceeded; and a trip device (40) for shutting down the power supply system (4).

An apparatus and method for identifying liner holidays, with a generator having two contacts with a liner and pulsing current to a moving one of the contacts. A plurality of detected electric signals are processed to continuously generate a baseline indicative of a holiday. A holiday signal is actuated when a signal is detected which when compared to the generated baseline indicates a holiday. A plurality of electric signal types and baselines, such as current strength and voltage, may be separately detected with a holiday signal actuated when either signal type is detected which when compared to its generated baseline indicates a holiday. The moving contact may be flexible to conform to contour of the liner.

An abnormality detection method according to one aspect of the present disclosure is a method of detecting an abnormality in an AC signal to be input from an AC power supply. The method includes, where an ideal AC signal is represented as V.sub.0 sin ωt (V.sub.0: amplitude, co: angular frequency, t: time), calculating an arithmetic value including a value represented by sin.sup.2ωt+cos.sup.2ωt and determining that the AC signal is abnormal when the arithmetic value is out of a threshold range.

A testing device including a main housing, and a probe housing, wherein the probe housing is rotatably coupled to the main housing. The testing device further includes a first test probe and a second test probe. The first test probe may be configured to be inserted into an alternating-current receptacle. The second test probe is coupled to the probe housing. The second test probe may be configured to be inserted into a universal serial bus receptacle.