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 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.

Systems, apparatuses, and methods are described for calibration of a current transformer. In some examples, one or more electrical elements may be affected in order to set a calibration of the current transformer. A calibration circuit of the current transformer may be permanently or non-permanently affected according to a calibration code in order to set the calibration of the current transformer. For example, one or more fuses may be burned to lock in a certain configuration of the current transformer.

A clamp sensor includes: a pair of clamp arms that construct a ring-shaped sensor in a closed state and rotate about a rotational shaft provided near base ends of the clamp arms so that other ends of the clamp arms come in to contact and move apart; and a pair of operating arms that extend from the base ends of the clamp arms and are capable, by rotating about the rotational shaft so as to approach each other, of shifting the clamp arms into an open state. The operating arms are formed in arc shapes where, when looking along an axial direction of the rotational shaft, an outer edge of one operating arm and an outer edge of the other operating arm are curved in a same direction.

Systems, apparatuses, and methods are described for calibration of a current transformer. In some examples, one or more electrical elements may be affected in order to set a calibration of the current transformer. A calibration circuit of the current transformer may be permanently or non-permanently affected according to a calibration code in order to set the calibration of the current transformer. For example, one or more fuses may be burned to lock in a certain configuration of the current transformer.

The present disclosure discloses a Single-Event Transient (SET) pulse measuring circuit capable of eliminating impact thereof, and an integrated circuit chip. The SET pulse measuring circuit capable of eliminating impact thereof includes four parts: a SET pulse test chain, a latch circuit, a flip-flop test circuit, a latching self-trigger circuit. The integrated circuit chip is provided with a test chain module and two sets of SET pulse measuring circuits capable of eliminating impact thereof, and inputs of the two sets of SET pulse measuring circuits capable of eliminating impact thereof are the same and each are connected to an output terminal of the test chain module.

The present disclosure discloses a Single-Event Transient (SET) pulse measuring circuit capable of eliminating impact thereof, and an integrated circuit chip. The SET pulse measuring circuit capable of eliminating impact thereof includes four parts: a SET pulse test chain, a latch circuit, a flip-flop test circuit, a latching self-trigger circuit. The integrated circuit chip is provided with a test chain module and two sets of SET pulse measuring circuits capable of eliminating impact thereof, and inputs of the two sets of SET pulse measuring circuits capable of eliminating impact thereof are the same and each are connected to an output terminal of the test chain module.

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, apparatuses, and methods are described for calibration of a current transformer. In some examples, one or more electrical elements may be affected in order to set a calibration of the current transformer. A calibration circuit of the current transformer may be permanently or non-permanently affected according to a calibration code in order to set the calibration of the current transformer. For example, one or more fuses may be burned to lock in a certain configuration of the current transformer.