Patent
Fault current sensor device with radio transceiver
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TLDR
In this article, a fault current sensor device is used to detect and distinguish abnormal current events such as momentary outage, sustained outage, normal overload, and inrush on an alternating current overhead or underground power transmission or distribution line.Abstract:
A fault current sensor device (1) which can detect and distinguish abnormal current events such as momentary outage, sustained outage, normal overload, and inrush on an alternating current overhead or underground power transmission or distribution line (2). The sensing device (1) is attached to the power line (2) and, when a fault condition is detected, a Schmitt trigger (15) wakes up a microprocessor (11) from a sleep mode. The microprocessor distinguishes which one of the fault current conditions has occurred on the power line (2), and a transceiver (3) transmits an alarm signal to a designated ground station. The device (1) can be remotely programmed to alter its trigger or threshold level or time delay to reset the device (1) when a fault has occurred. When normal current levels return, the device can be reset by itself or remotely from the ground station. The fault sensor device is powered by capacitors (8) which are charged by photovoltaic cells (7) or a current transformer (18).read more
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References
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System for rating electric power transmission lines and equipment
TL;DR: In this article, the authors present a system for determining the current carrying capability of one or more overhead power transmission lines, where a sensor-transmitter unit may be removably clamped on the line conductor, which includes a radio transmitter for transmitting sensed data to a receiving substation.
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TL;DR: In this article, a remote sensing and communications system for installation on energized high voltage conductors is described, which is capable of measuring electrical, mechanical or environmental parameters in the vicinity of a high voltage conductor.
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TL;DR: In this article, a method and a fault sensor device which can detect and distinguish abnormal current and voltage events on an alternating current overhead and underground transmission line or distribution line are presented.
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TL;DR: In this paper, a method and apparatus for detecting a fault on a power line carrying a line parameter such as a load current is described, where the energy value is compared to a threshold value stored in a buffer.