Multimode communication method for transmission line condition monitoring

A multi-mode communication method for monitoring status of a power transmission line,

• [1] said power transmission line includes
• a plurality of sensing devices, installed on the power transmission line, configured to
• monitor status of the power transmission line thereof,
• obtain power transmission line status signals, and
• send the power transmission status signals to a communication terminal;
• a communication terminal, configured to
• collect the power transmission status signals from the plurality of the sensing devices;
• and
• send the power transmission line status signals collected to a remote monitor center;
• wherein the plurality of sensing devices and the communication terminal are powered by batteries;
• wherein
• the plurality of sensing devices and the communication terminal are organized to form a primary communication network in accordance with a ZigBee network format, and
• the plurality of sensing devices and the communication terminal are organized to form a backup communication network using a Bluetooth network;
• the communication terminal and the remote monitoring center are linked according to WinMAX network format;
• [2] the method comprising
• in a step of sending a power line status signal to the communication terminal, by any of the plurality of the sensing device, comprising
• as first set of steps,
• identifying three neighbor sensing devices for one of the plurality of the sensing device;
• monitoring remaining battery capacity power for the three neighbor sensing devices;
• monitoring the distance hop count value (a number of hops) between each of the three neighbor sensing device and the communication terminal,
• [3] selecting a forwarding device according to the following rules:
• 1) when the numbers of hops from each of the three neighbor sensing devices to the communication terminal are the same,
• selecting the neighbor sensing devices having a highest remaining battery power as the forwarding device;
• 2) when the remaining battery power of the three neighbor sensing device are the same,
• selecting the neighbor sensing device having a least number of hops from the communication terminal as the forwarding device;
• 3) when the numbers of hops from the three neighbor sensing devices to the communication terminal are different, and at the same time,
• the remaining battery powers of the three neighbor sensing devices are not the same,
• selecting the neighbor sensing device having a smallest ratio of the number of hops to the remaining battery power (hop counts/remaining battery power) as the forwarding device;
• selecting the neighbor sensing device having a highest remaining battery power as the forwarding device,
• when the ratios are the same for all three neighbor sensing devices;
• [4] selecting a communication network between the one of the plurality of the sensing device and the corresponding forwarding device according to the following rules:
• if both, an amount data to be sent and degree of interference, of the transmission line status signal to be transmitted, are lower than a predetermined threshold, and the security level of the transmission line status signal to be transmitted is higher than a preset value,
• then selecting the primary communication network as the communication network between the one of the plurality of the sensing device and the corresponding forwarding device,
• otherwise, selecting the backup communication network as the communication network between the one of the plurality of the sensing device and the corresponding forwarding device;
• and
• [5] subsequently, taking the forwarding device as a sensing device for the transmission line status signal to be transmitted, and performing the steps continuously until the transmission line status signals are all sent to the communication terminal.