A partial discharge measurement method includes: a moving step of moving an insulated wire including an insulating layer on a surface of the insulated wire; a voltage applying step of bringing an electrode which is connected to a power supply into contact with the insulating layer of the insulated wire which is moving, and applying a predetermined test voltage to the insulating layer while moving the insulated wire; a detection step of detecting, as a partial discharge signal, a signal which is more than or equal to a threshold value among signals involved in partial discharge events occurring from the insulating layer due to application of the predetermined test voltage; and a determination step of determining, based on a result in the detection step, frequency of occurrence of partial discharge events at the predetermined test voltage.

A system for real-time continuous and remote monitoring of the progressive degradation of insulators installed in Electric Power Transmission Networks, namely in Very High Voltage electric Lines (VHVL), which can be applied at lower voltage levels (High and Medium Voltage). The principle of operation is based on the identification of the occurrence of leakage currents in the insulators by registering the current intensities, the periods of the occurrences, and local measurements of temperature and relative humidity.

An in-line cable termination system for use with first and second electrical power transmission cables includes an isolating apparatus having an isolating apparatus axis and including an electrically conductive first end member and an electrically conductive second end member, first and second insulators, and a fused switch mechanism. The first end member and the second end member are spaced apart along the isolating apparatus axis. Each of the first and second end members includes a respective coupling portion to mechanically and electrically engage the first and second cables, respectively. The first and second insulators each extend between and couple the first end member and the second end member. The fused switch mechanism includes a fuse module and is configured to selectively alternatively electrically connect the first and second end members, and thereby the first and second cables, through the fuse module and disconnect the first and second end members.

An integrated circuit is configured to detect current leakage that results from electromigration in the integrated circuit. An isolation power switch selectively connects a target voltage rail in the integrated circuit to a power source. A voltage memory stores a record of an initial voltage decay rate for the target voltage rail while isolated from a manufacturer's power source. A voltage record comparator logic compares the initial voltage decay rate to a field voltage decay rate for the target voltage rail when isolated from a field power source. An output device indicates that a difference between the initial voltage decay rate and the field voltage decay rate for the target voltage rail exceeds a predefined limit, where the difference is a result of current leakage caused by electromigration in the integrated circuit.

A fuse holder for a fuse cutout includes a molded member including a short fuse tube section and a downwardly extending fin member adapted for securing to a trunnion assembly. An arc quenching liner is disposed in the interior of the tube section and a top casting is connected to the top of the fuse holder and adapted to receive and hold an arc flange of an arc sleeve on a top edge, thereby keeping the arc flange above the top casting. A conductive screw cap seals the assembly. The shorter tube and the provision of the arc flange above the top casting provides superior arc quenching properties.

Embodiments of the present disclosure include a method of operating an arc fault detection system, an arc fault detection system, and a system. An embodiment is a method of operating an arc fault detection system coupled to a power line, the method including determining one or more arc fault detection windows in power line signals on the power line, the power line signals comprising a communication signal and an alternating current (AC) power signal. The method further includes receiving the power line signals from the power line during the one or more arc fault detection windows, and performing arc fault detection processing on the received power line signals.

A method and device for determining an insulation variable of a network. The method may comprise measuring a first voltage at the network, connecting the auxiliary system to the network, measuring a second voltage at the network, disconnecting the auxiliary system from the network, measuring a third voltage at the network, and determining the insulation variable based on the first voltage, the second voltage, and the third voltage.

An electro-mechanical disconnector mounted between an HV overhead power line conductor and a voltage transformer, mounted on a support of the support power line of HV overhead power line conductors. The electro-mechanical disconnector comprises an isolating element and a sacrificial element arranged in series with each other. The sacrificial element is made of a material capable of melting upon the passage of a fault current, and the sectioning element is capable of moving to an electrically insulating distance from the conductor following the melting of the element.

An insulation resistance detection circuit is coupled to a positive end and a negative end of a DC power source, and is used to detect a positive insulation resistance between the positive end and a ground point and detect a negative insulation resistance between the negative end and the ground point. A detection unit sets a first estimated resistance and a second estimated resistance, and acquires a first voltage based on turning on the switch and acquires a second voltage based on turning off the switch. The detection unit calculates a third voltage and a fourth voltage according to the first estimated resistance and the second estimated resistance so as to detect the positive insulation resistance and the negative insulation resistance when the third voltage is equal to the first voltage and the fourth voltage is equal to the second voltage.

An insulation device is disclosed. The insulation device is used as an insulator of a fuse cutout, and comprises: a cylindrical insulating body, a plurality of first insulation sheds, an extending cylindrical insulating body horizontally connected to the cylindrical insulating body, and at least one second insulation shed, in which said first insulation shed is a circular fin extending radially outwardly from a side surface of the cylindrical insulating body, and the second insulation shed is also a circular fin extending radially outwardly from a side surface of the extending cylindrical insulating body. Compared to the conventional insulator of the fuse cutout, the insulation device according to the present invention has longer creepage distance because of additionally including the extending cylindrical insulating body and the at least one second insulation shed, so as to exhibit superior electrical performance under sever weather condition.