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1. US20200303950 - Method For Remotely Monitoring Failed Surge Arrester Disconnectors and Energy Harvester For Autonomous Power Supply Of Monitoring Devices Installed On Surge Arresters

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Claims

1 A method of remotely monitoring a status of a surge arrester disconnector, comprising:
providing a long-range wireless mesh communication system including a plurality of surge arrester disconnectors organized in a plurality of clusters, each cluster includes a plurality of surge arrester disconnectors that are physically located within a same cluster area, at least one of the surge arrester disconnectors in each cluster is coupled to a communication device of a predetermined communication range for transmitting a signal indicative of a disconnector status;
transmitting, from a first cluster of the plurality of clusters, a status signal indicative of a status of a first surge arrester disconnector in the first cluster to a second cluster located within the predetermined communication range from the first cluster;
consecutively transmitting the status signal from the second cluster that receives the status signal to a third cluster within the predetermined communication range, until reaching an end cluster on the long-range mesh communication system;
transmitting, from the end cluster, the status signal to a monitoring station; and
monitoring the status of the first surge arrester disconnector at the monitoring station based on a result of transmission of the status signal.
2. The method of claim 1, wherein absence of reception of the status signal is indicative of the first surge arrester disconnector having operated to disconnect a respective surge arrester from ground.
3. The method of claim 1, wherein the status signal is transmitted from any of the plurality of clusters via low-power high-speed radio communications.
4. The method of claim 1, wherein at least one of the plurality of clusters includes a surge arrester disconnector coupled to the communication device and configured to act as a cluster head, the cluster head receiving a plurality of status signals from the plurality of surge arrester disconnectors included in the same cluster and transmitting the status signals to an adjacent cluster within the predetermined communication range.
5. The method of claim 4, further comprising, for each of the plurality of clusters, randomly selecting a surge arrester disconnector from the plurality of surge arrester disconnectors coupled to the communication device that are included in the same cluster for acting as the cluster head.
6. The method of claim 5, wherein, when it is detected that the cluster head of the cluster is not communicating, automatically selecting an operative disconnector from the plurality of surge arrester disconnectors coupled to the communication device that are included in the same cluster as the cluster head.
7. The method of claim 4, wherein each of the plurality of clusters includes a cluster head, the transmitting of the status signals between adjacent clusters is performed by the cluster heads.
8. The method of claim 1, wherein the status signal of the first surge arrester disconnector is transmitted directly between adjacent clusters that are separated from each other by a distance of substantially the predetermined communication range.
9. The method of claim 1, wherein the status signal of the first surge arrester disconnector is transmitted between adjacent clusters that are separated from each other by more than the predetermined communication range via a repeater.
10. A method of detecting a failed surge arrester from a monitoring station remote to the surge arrester, comprising:
providing the surge arrester connected in series with a disconnector configured to automatically disconnect the surge arrester from ground in case of a failure;
collecting charge from a leakage current that flows from the surge arrester to ground via the disconnector and storing the collected charge in a storage capacitive element;
powering a monitoring device and/or a communication device installed at the surge arrester using the charge stored in the storage capacitive element; and
monitoring reception of a signal transmitted from the monitoring device and/or the communication device at the monitoring station, absence of reception of the signal is indicative of the disconnector having operated to disconnect the surge arrester from ground.
11. An energy harvester apparatus for harvesting energy from a leakage current of a surge arrester, comprising:
a first input terminal and a second input terminal coupled in series with the surge arrester and ground potential to collect the leakage current that flows from the surge arrester; and
an energy storage circuit having a storage capacitor adapted to store charge from the collected leakage current and to supply the stored charge, via the first input terminal and the second input terminal coupled to the storage capacitor, to an electronic device.
12. The energy harvester apparatus of claim 11, further comprising a first over-voltage protection arrangement coupled across the first input terminal and the second input terminal and adapted to establish a bypass path when a transient voltage above a first threshold is applied across the first input terminal and the second input terminal.
13. The energy harvester apparatus of claim 12, wherein the first over-voltage protection arrangement has a spark gap circuit adapted to establish the bypass path when the transient voltage is above a breakdown voltage.
14. The energy harvester apparatus of claim 12, further comprising a second over-voltage protection arrangement coupled in parallel to the first over-voltage protection arrangement and adapted to establish a bypath to ground when the transient voltage rises above a second threshold, the second threshold being lower than the first threshold.
15. The energy harvester apparatus of claim 14, wherein the second over-voltage protection arrangement has a transient-voltage-suppression diode adapted to bypass a transient current to ground.
16. The energy harvester apparatus of claim 14, further comprising a capacitive rectifier arrangement coupled to at least one of the first over-voltage protection arrangement and the second over-voltage protection arrangement to rectify a current output by the first over-voltage protection arrangement and/or the second over-voltage protection arrangement and to supply the rectified current to the energy storage circuit.
17. The energy harvester apparatus of claim 11, wherein the energy storage circuit includes a current sensing circuit adapted to sense a current received by the energy storage circuit.