A power distribution monitoring system is provided that can include a number of features. The system can include a plurality of power line sensing devices configured to attach to individual conductors on a power grid distribution network. In some embodiments, the power line sensors can include a split-core transformer. In some embodiments, a power line sensing device is disposed on each conductor of a three-phase network. The sensing devices can be configured to measure and monitor, among other things, current and electric-field on the conductors. Methods of installing, sealing, and protecting the split-core transformers of the power line sensors are also discussed.

A power distribution monitoring system is provided that can include a number of features. The system can include a plurality of power line sensing devices configured to attach to individual conductors on a power grid distribution network. In some embodiments, the power line sensors can include a split-core transformer. In some embodiments, a power line sensing device is disposed on each conductor of a three-phase network. The sensing devices can be configured to measure and monitor, among other things, current and electric-field on the conductors. Methods of installing, sealing, and protecting the split-core transformers of the power line sensors are also discussed.

In an exemplary embodiment of the present disclosure for solving the problem, disclosed is a stability-improved high voltage power line path exploration apparatus. The stability-improved high voltage power line path exploration apparatus for tracking a high voltage power line and determining a buried path and a connection configuration up to a final power source of a power distribution system, wherein the high voltage power line is connected to a primary winding of a distribution transformer to supply voltage and current, wherein the distribution transformer converts high voltage for distribution to low voltage in proportion to a ratio of a winding combination may include: an exploration current generator for generating a current pulse signal in inverse proportion to a winding ratio for detecting a magnetic field signal around the high voltage power line, in which the exploration current generator is connected to a secondary winding of the distribution transformer; a buried path probe for tracking the buried path and connection configuration of the high voltage power line by detecting the magnetic field signal which is generated around the high voltage power line when the current pulse signal flows through the high voltage power line; and a reverse current limiter for suppressing a generation of a reverse magnetic field generated by an external conductor of the high voltage power line, to improve a reception performance of the buried path probe.

Systems and methods for measuring DC voltage of an insulated conductor (e.g., insulated wire) are provided, without requiring a galvanic connection between the conductor and a test electrode or probe. A non-contact DC voltage measurement device may include a conductive sensor that is mechanically oscillated. The device may also include a conductive internal ground guard that is galvanically isolated from the conductive sensor, and a conductive reference shield that is galvanically insulated from the internal ground guard. The device may further include a common mode reference voltage source that generates an alternating current (AC) reference voltage, and a sensor signal measurement subsystem electrically coupled to the conductive sensor. Control circuitry may receive a sensor current signal from the sensor signal measurement subsystem, and determine the DC voltage in the insulated conductor based at least in part on the received sensor current signal.

A clamped object is reliably clamped. A clamp sensor includes a pair of clamp arms that are formed so as to be substantially arc-shaped in plan view, that are configured so that at least one of the clamp arms is rotatable so that respective front ends of the clamp arms open and close, and that form a ring-shaped body in a state where the front ends are closed. Front end portions of the clamp arms have a pair of facing surfaces that construct the outer circumferential surface and the inner circumferential surface of the ring-shaped body, a pair of facing surfaces that construct two side surfaces of the ring-shaped body, a pair of facing surfaces that are inclined to the facing surfaces, and a pair of facing surfaces that are inclined to the facing surfaces.

A clamped object is reliably clamped. A clamp sensor includes a pair of clamp arms that are formed so as to be substantially arc-shaped in plan view, that are configured so that at least one of the clamp arms is rotatable so that respective front ends of the clamp arms open and close, and that form a ring-shaped body in a state where the front ends are closed. Front end portions of the clamp arms have a pair of facing surfaces that construct the outer circumferential surface and the inner circumferential surface of the ring-shaped body, a pair of facing surfaces that construct two side surfaces of the ring-shaped body, a pair of facing surfaces that are inclined to the facing surfaces, and a pair of facing surfaces that are inclined to the facing surfaces.

Systems and methods for measuring direct current (DC) voltage of an insulated conductor (e.g., insulated wire) are provided, without requiring a galvanic connection between the conductor and a test electrode or probe. A non-contact DC voltage measurement device may include a conductive sensor that is mechanically oscillated. The insulated conductor under test serves as a first conductive element or electrode of a coupling capacitor, and the vibrating conductive sensor serves as a second conductive element or electrode of the coupling capacitor. The oscillation of the conductive sensor provides the coupling capacitor with a time-varying capacitance value. The measurement device detects current flowing through the coupling capacitor, and determines the DC voltage in the insulated conductor using the detected current and the time-varying capacitance. The determined DC voltage may be output to a display or transmitted to an external system via a wired or wireless connection.

Systems and methods for measuring electrical parameters (e.g., voltage, current, power) in an insulated or blank uninsulated conductor (e.g., insulated wire) without requiring a galvanic connection between the conductor and a clamp probe. A clamp probe may include a normally closed, spring loaded jaw having a flexible strap therein that includes one or more non-contact sensors. The jaw may also include a Rogowski coil to enable non-contact current measurements. A user may compress handles of the clamp probe to open its jaw. In the open position, the user may position the jaw around the conductor under test and release the handles. The jaw then closes and tightens the flexible strap around the insulated conductor such that the one or more non-contact sensors are positioned adjacent the insulated conductor to obtain an accurate measurement of an electrical parameter of the insulated conductor.

A clip-on ammeter includes a current measurement unit, an evaluation unit and a USB interface. The current measurement unit records current values and provides the current values as measurement values for transfer purposes. The evaluation unit includes an ND converter and is connected to the current measurement unit. The evaluation unit allows the measurement values to be transmitted in a processable form as USB compatible digital data to the USB interface. The USB interface is connected to the evaluation unit and the USB interface allows the USB compatible data to be made available for transfer purposes to be further processed. The evaluation unit is energized via the USB interface. The clip-on ammeter includes a voltage transformer. The voltage transformer provides a stabilized voltage as a reference voltage for the current measurement unit.

A clip-on ammeter includes a current measurement unit, an evaluation unit and a USB interface. The current measurement unit records current values and provides the current values as measurement values for transfer purposes. The evaluation unit includes an ND converter and is connected to the current measurement unit. The evaluation unit allows the measurement values to be transmitted in a processable form as USB compatible digital data to the USB interface. The USB interface is connected to the evaluation unit and the USB interface allows the USB compatible data to be made available for transfer purposes to be further processed. The evaluation unit is energized via the USB interface. The clip-on ammeter includes a voltage transformer. The voltage transformer provides a stabilized voltage as a reference voltage for the current measurement unit.