• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A faulted circuit indicator periodically joins a network to report information and receive commands. The faulted circuit indicator optimizes the transmit power used to join the network so that an acceptable network acquisition time and/or robust routing through multiple nodes are obtained.
    公开号:ES2555883A2
    申请号:ES201590013
    申请日:2013-09-04
    公开日:2016-01-11
    发明作者:Ryan W. Swartzendruber；Laurence V. Feight
    申请人:Schweitzer Engineering Laboratories Inc；
    IPC主号:
    专利说明:

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    electrical substation Substation node 202 is assumed to be always on and available for communication. The second stationary network node 204 may be a device for monitoring the power distribution system, such as a fault indicator in a circuit. Generally, the second stationary network node 204 provides power to its network circuit system as necessary, and is normally in the off state, as shown in Figure 6a. As explained further in this document, the second stationary network node 204 adjusts its transmission power over time to optimize its network acquisition time. Network acquisition time is the time required for a potential network node to join a particular network. Generally, the network acquisition procedure involves assigning a network address to the potential network node, as well as updating the routing information for the new neighbors of the potential network node, and transmitting the routing information to the potential network node. Figure 6b shows the second stationary network node 204 after it has joined the power monitoring network, completing the procedure of acquiring the network with the substation node
    202. After the node of the secondary network of 204 completes the procedure for acquiring the network, it will transmit the data it has queued, it will receive any data addressed to it and after processing the received data, it shuts down its system of network circuits to save energy.
    Figure 7 is a flowchart depicting a method by which a potential stationary network node can join a wireless network and achieve an optimized combination of network acquisition time and the necessary transmission power. The detailed procedure seeks a minimum of transmission power expense for an acceptable network acquisition time. In general, additional transmission power is reserved for a greater transmission range. Outside the energy range for a particular transmission, data packets can still be sent successfully, but errors are more likely to occur. Therefore, the desired transmission power is the minimum that allows packet transmission without errors.
    In a step 302, the potential stationary network node provides power to its network circuit system, initializes the internal variables, and performs other tasks associated with the start of the network acquisition procedure. As part of the start of the network acquisition procedure, the potential network node initializes its transmission power. The procedure by which the transmission power is initiated is generic. By
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    Returning to step 306, if network binding confirmation packets are received, execution proceeds to step 316, where the network node performs the necessary tasks to reflect its status as part of the network. These tasks may include, for example, the creation
    or updating routing information with its closest neighbors based on the data received during the network acquisition procedure.
    Figure 8 represents a more complicated topography of the wireless network, known as a wireless mesh network. In particular, a series of stationary network nodes always on 202a-e, hereinafter referred to as repeaters, is represented. In addition, a series of stationary secondary nodes 204a-k are also represented. As explained with respect to Figure 5, these nodes are not "always on"; They feed their network circuits as necessary to send and receive data occasionally. With respect to Fig. 8, it should be assumed that in the maximum transmission power node 204k it is possible to communicate with repeaters 202d and 202e, while in a much smaller transmission power node 204k it can only communicate with a repeater 202e. The following network acquisition procedure is expanded in the procedure described above, so it represents not only the acquisition time of the network versus the transmission power, but also the number of repeaters with which a node can communicate with regarding the transmission power. This power reference between nodes becomes more important when "urgent" data must be communicated, such as a fault condition. In particular, when communicating with multiple repeaters, the repeater that offers the fastest communication for the destination node can be chosen.
    Figure 9a illustrates the communication coverage of a network node in a populated network environment, such as that of Figure 8, using the procedure of Figure 7 or a similar procedure for communicating with the minimum network energy required to communicate. With a neighboring repeater. As shown, a stationary network node fed discontinuously 204 uses the minimum transmission power to communicate with the always on network node 202a (which may be the physically closest node, the node with the least interference between them, or similar). The minimum transmission power produces a radius 205. However, as depicted, three additional always on network nodes are placed just outside the radius 205, so that a slightly higher transmission power would capture those nodes. Using a procedure such as that shown in Figure 6, network node 204 will not have the necessary information to know that with a slightly higher transmission power
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    Same number of communication nodes. If so, the execution proceeds to step 418, where the power configuration is reserved. The execution then goes to step 419.
    Likewise, if in step 417 the energy configuration used to transmit the previous network connection request packet was not the lowest energy configuration that obtained the same number of communication nodes, the execution proceeds to the stage 419. In step 419, a comparison is made between the number of communication nodes and a predefined power reference to determine whether communication has been achieved with the number of nodes deemed necessary for robust routing. This check may involve, for example, a comparison between the number of communication nodes and an absolute level. Similarly, the verification may involve a comparison between a derived indicator based on previous attempts to join the network. For example, a previous attempt to join the network with a transmission power of 250 milliwatts resulting in a communication node could be used to obtain a predefined reference of the required power. A present attempt to join the network with a transmission power of 300 milliwatts resulting in four communication nodes is compared with the reference of power obtained, and depending on the relative importance of the transmission power compared to the robustness of additional communication achieved with three additional communication nodes, a decision would be made as to whether the progressive increase in transmission power is justified. If not, the execution proceeds to step 422, where a check is made to determine if a previous power configuration provides a better compromise between the transmission power and the number of communication nodes. If a previous power configuration provides a better compromise solution, then the execution proceeds to step 420, where the previous power configuration is restored. However, if there is no prior energy adjustment that provides a better compromise solution, then the execution proceeds to step 408, where a check is made to determine if the last energy adjustment actually provides some communication nodes. If so, the execution proceeds to step 410, where the execution proceeds as described above.
    Returning to step 419, if communication has been achieved with a sufficient number of nodes for robust routing, the execution proceeds to step 416, where the node of the potential stationary network joins the network, as in the procedure described previously.
    A number of variations of the previous network acquisition procedure are also contemplated within the scope of this description. A simple variation would be for the node
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    procedure of Fig. 10. Returning to step 454, if the stationary network node is not operating with battery power, then the message is sent using the maximum power in step 458.
    5 The above description has been presented for purposes of illustration, and is not intended to be exhaustive or to limit the coverage of the appended claims to the precise manner disclosed. The description was devised to better explain to the persons skilled in the art the principles of the network acquisition procedure disclosed when used with continuous non-stationary network nodes, such as indicators of failures in a circuit.
    10 It is the intention that the inventors of this disclosure receive the full extent permitted by law for the appended claims, which should not be limited by this description.
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    权利要求:
    Claims (1)
    [1]
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    法律状态:
    2016-12-15| FG2A| Definitive protection|Ref document number: 2555883 Country of ref document: ES Kind code of ref document: B1 Effective date: 20161215 |
    2017-06-09| FA2A| Application withdrawn|Effective date: 20170605 |
    优先权:
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    US13/605,679|2012-09-06|
    US13/605,679|US9386529B2|2012-09-06|2012-09-06|Power management in a network of stationary battery powered control, automation, monitoring and protection devices|
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