Two-channel collaborative lightning arrester on-line monitoring system and method

Abstract

The invention relates to a lightning arrester on-line monitoring system, in particular to a dual-channel collaborative lightning arrester on-line monitoring system and a dual-channel collaborative lightning arrester on-line monitoring method, and solves the problems that a polling mode and an active sending mode adopted by an existing lightning arrester on-line monitoring system are not ideal in power consumption and data sending conflicts respectively. The remote transmission meter is firstly switched to the first channel to receive the synchronous data sent by the first wireless communication module after being awakened, and then the waiting time required by the remote transmission meter to send the monitoring data is calculated according to the synchronous data, and if the target remote transmission meter in the synchronous data is just the current remote transmission meter, the remote transmission meter is switched to the first channel to receive the synchronous data sent by the first wireless communication module. If yes, directly switching to the second channel to send the monitoring data, and if not, continuing to sleep according to the calculated waiting duration to reduce the power consumption.

Description

Technical Field

[0001] The present invention relates to an arrester online monitoring system, and in particular to a dual-channel coordinated arrester online monitoring system and method. Background Art

[0002] At present, substations are usually equipped with lightning arrester online monitoring systems with wireless remote transmission functions. The monitoring system is usually equipped with multiple remote transmission meters to monitor the operating parameters of the lightning arrester. The remote transmission meters generally work in a passive wireless manner. There are two main ways of communication with the background host. One is the polling method: the background host sends query commands to each remote transmission meter in turn. After receiving the query command, the remote transmission meter returns the monitoring data to the background host; the other is the active sending method: each remote transmission meter regularly monitors the channel. If there is no signal in the channel, it immediately sends the monitoring data to the background host through the channel.

[0003] However, both of the above methods have certain limitations. In order to reduce power consumption, remote meters using polling generally use air interface wake-up mode for communication, that is, the remote meters are in sleep state most of the time, and then wake up periodically to receive channel data. In this mode, although the power consumption is reduced, it is still not ideal because it needs to be woken up periodically to receive data. Especially for passive wireless devices, the power consumption needs to be further reduced to ensure the operation time.

[0004] Remote meters that use active transmission are usually in sleep mode and are awakened only when data needs to be sent. The power consumption is greatly reduced, which can fully meet the requirements of passive wireless remote meters. However, there is another problem with this method. If two or more remote meters monitor the channel at the same time and find no signal in the channel at the same time, they will send data synchronously. There is a high possibility of data transmission conflict in one channel, especially for systems with a large number of remote meters. The possibility of such conflict is greater. Summary of the invention

[0005] The purpose of the present invention is to solve the technical problems of unsatisfactory power consumption and data transmission conflicts respectively in the polling mode and active transmission mode adopted by the existing arrester online monitoring system, and to provide a dual-channel coordinated arrester online monitoring system and method.

[0006] In order to achieve the above-mentioned invention object, the present invention provides the following technical solutions:

[0007] A dual-channel coordinated arrester online monitoring system is used for online monitoring of the arrester, and its special features are: comprising n remote meters and a background host; n≥2, the IDs of the n remote meters are 1 to n in sequence; the input end of the remote meter is used to be electrically connected to the grounding end of the arrester;

[0008] Each of the remote transmission meters includes a wireless communication unit and a main control module, and the background host is provided with a first wireless communication module and a second wireless communication module;

[0009] The first wireless communication module communicates wirelessly with the wireless communication unit through the first channel; the second wireless communication module communicates wirelessly with the wireless communication unit through the second channel; the wireless communication unit is electrically connected to the input end of the remote meter through the main control module;

[0010] The first wireless communication module is used to send synchronization data to the wireless communication unit through the first channel;

[0011] The second wireless communication module is used to receive monitoring data from the wireless communication unit through a second channel;

[0012] The wireless communication unit is used to receive synchronization data sent from the first wireless communication module and send monitoring data to the second wireless communication module.

[0013] Furthermore, the wireless communication unit, the first wireless communication module and the second wireless communication module are all LoRa modules.

[0014] At the same time, the present invention also provides a dual-channel coordinated arrester online monitoring method, based on the above-mentioned dual-channel coordinated arrester online monitoring system, which is special in that it includes the following steps:

[0015] S1. Start the remote meter;

[0016] S2, setting the sleep time T of the wireless communication unit, and then the wireless communication unit enters the sleep state;

[0017] S3, after the sleep time T ends, the wireless communication unit is awakened, the input end of the remote meter receives the current signal from the arrester and transmits it to the main control module, and then the main control module converts the current signal into monitoring data and transmits it to the wireless communication unit;

[0018] S4, the wireless communication unit switches to the first channel and receives the synchronization data sent by the first wireless communication module;

[0019] S5, the remote meter calculates the waiting time t required to send the monitoring data according to the synchronization data;

[0020] S6. If the waiting time t required to send the monitoring data is greater than 0, the waiting time t is used as the sleep time T of the wireless communication unit and the process returns to step S2; if it is equal to 0, the process proceeds to step S7;

[0021] S7, the wireless communication unit switches to the second channel and sends monitoring data to the second wireless communication module;

[0022] S8. Reset the sleep time T and return to step S2 to prepare for the next sending of monitoring data, thereby completing a dual-channel coordinated arrester online monitoring.

[0023] Furthermore, the method for calculating the waiting time t required for sending monitoring data in step S5 is as follows:

[0024] If the ID of the target remote meter in the synchronization data is the same as the ID of the current remote meter, then t = 0;

[0025] If the ID of the target remote meter in the synchronization data is smaller than the ID of the current remote meter,

[0026] t=((D0-D4)×D3-D5)×t0

[0027] Where: D4 is the ID of the target remote meter, D0 is the ID of the remote meter, D3 is the number of synchronous data frames sent continuously for each ID, D5 is the frame sequence number of the target remote meter, and t0 is the time taken to send each frame of synchronous data;

[0028] If the ID of the target remote meter in the synchronization data is greater than the ID of the remote meter, then

[0029] t=((D2-D4+D0)×D3-D5)×t0

[0030] Where: D2 is the maximum ID.

[0031] Furthermore, in step S8, the calculation formula of the sleep time T is as follows:

[0032] T = (D2×D3-D5)×t0.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] In a dual-channel coordinated lightning arrester online monitoring system provided by the present invention, after waking up, the remote meter first switches to the first channel to receive the synchronization data sent by the first wireless communication module, and then calculates the waiting time required for sending the monitoring data according to the synchronization data. If the target remote meter in the synchronization data happens to be the remote meter, it directly switches to the second channel to send the monitoring data. If not, it continues to sleep according to the calculated waiting time. After the waiting sleep time is over, it is the turn of the remote meter to send the monitoring data. In this way, at the same time, only one target remote meter selected by the background host in the second channel is sending the monitoring data, so that there will be no problem of data transmission conflict, and if the calculated waiting time required to send the monitoring data is greater than 0, the wireless communication unit will enter sleep again to reduce power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a principle diagram of an embodiment of a dual-channel coordinated arrester online monitoring system of the present invention (only one remote transmission meter is shown);

[0036] Figure 2 It is a flow chart of an embodiment of a dual-channel coordinated arrester online monitoring method of the present invention;

[0037] Figure 3 This is a schematic diagram of the composition of the synchronization data in step S5 in an embodiment of a dual-channel coordinated arrester online monitoring method of the present invention.

[0038] The following are the descriptions of the reference numerals:

[0039] 1-remote transmission meter, 11-wireless communication unit; 2-backend host, 21-first wireless communication module, 22-second wireless communication module; 3-first channel, 4-second channel. DETAILED DESCRIPTION

[0040] The present invention is further described below in conjunction with the accompanying drawings and exemplary embodiments.

[0041] Reference Figure 1 A dual-channel coordinated arrester online monitoring system of the present invention is used for online monitoring of arresters, including a background host 2 and n remote meters 1, n≥2; the input end of the remote meter 1 is connected to the ground end of the arrester through a cable, and each remote meter 1 includes a wireless communication unit 11 and a main control module, the wireless communication unit 11 is electrically connected to the input end of the remote meter 1 through the main control module, and the current signal sent from the ground end of the arrester is generally very large, and data transmission cannot be achieved without processing, so it is first transmitted to the main control module, and the main control module converts the current signal into a digital signal, that is, the monitoring data of the arrester, so that the monitoring data can be sent to the background host 2 through the wireless communication unit 11.

[0042] A first wireless communication module 21 and a second wireless communication module 22 are provided on the background host 2, and a wireless communication unit 11 is provided on the remote transmission meter 1, wherein the first wireless communication module 21 is wirelessly connected to the wireless communication unit 11 through the first channel 3. The second wireless communication module 22 is wirelessly connected to the wireless communication unit 11 through the second channel 4. In the first channel 3, the wireless communication unit 11 can only receive the synchronization data sent by the first wireless communication module 21. In the second channel 4, the wireless communication unit 11 sends its monitoring data to the second wireless communication module 22, so that the synchronization data and the monitoring data are separated by two channels to prevent conflicts. The wireless communication unit 11, the first wireless communication module 21 and the second wireless communication module 22 are all LoRa modules, which have the advantages of wide coverage, low power consumption and strong anti-interference ability.

[0043] In the entire online monitoring system, each remote meter 1 will be assigned a unique ID, which starts from 1 and is distributed continuously. Because there are n remote meters 1 in this system, the IDs of the n remote meters 1 are 1 to n in sequence; and the synchronization data sent by the background host 2 is in frames, which are composed of continuous frames of data. Therefore, when receiving synchronization data, the remote meter 1 needs to receive a complete frame. Each frame of synchronization data has a fixed length, such as Figure 3 As shown, it includes the frame start identifier—D1, the maximum ID—D2, the number of synchronous data frames sent continuously by each ID—D3, the ID of the target remote meter 1—D4, and the frame sequence number of the target remote meter 1—D5. Among them, D4 and D5 both start from 1, and D5 increases by 1 every time a frame of data is sent. When D5 exceeds D3, D5 starts from 1 again, and D4 increases by 1 at this time. When D4 increases and exceeds D2, D4 starts from 1 again.

[0044] At the same time, if Figure 2 As shown, the present invention also provides a dual-channel coordinated arrester online monitoring method, based on the above-mentioned dual-channel coordinated arrester online monitoring system, comprising the following steps:

[0045] S1, start remote meter 1;

[0046] S2, setting the sleep time T of the wireless communication unit 11, and then the wireless communication unit 11 enters the sleep state;

[0047] S3, after the sleep time T ends, the wireless communication unit 11 is awakened, the input end of the remote meter 1 receives the current signal from the arrester and transmits it to the main control module, and then the main control module converts the current signal into monitoring data and transmits it to the wireless communication unit 11;

[0048] S4, the wireless communication unit 11 switches to the first channel 3 and receives the synchronization data sent by the first wireless communication module 21;

[0049] S5. The remote transmission meter 1 calculates the waiting time t required to send the monitoring data according to the synchronization data; the calculation method is as follows:

[0050] If the ID of the target remote meter 1 in the synchronization data is the same as the ID of the remote meter 1, then t = 0;

[0051] If the ID of the target remote meter 1 in the synchronization data is smaller than the ID of the current remote meter 1, then

[0052] t=((D0-D4)×D3-D5)×t0

[0053] Where: D4 is the ID of the target remote meter 1, D0 is the ID of the remote meter 1, D3 is the number of synchronous data frames sent continuously for each ID, D5 is the frame sequence number of the target remote meter 1, and t0 is the time taken to send each frame of synchronous data;

[0054] If the ID of the target remote meter 1 in the synchronization data is greater than the ID of the remote meter 1, then

[0055] t=((D2-D4+D0)×D3-D5)×t0

[0056] Where: D2 is the maximum ID.

[0057] S6. If the waiting time t required to send the monitoring data is greater than 0, the waiting time t is used as the sleep time T of the wireless communication unit 11 and the process returns to step S2; if it is equal to 0, the process proceeds to step S7;

[0058] S7, the wireless communication unit 11 switches to the second channel 4 and sends monitoring data to the second wireless communication module 22;

[0059] S8, reset the sleep time T and return to step S2, prepare to send monitoring data next time, thereby completing a dual-channel coordinated arrester online monitoring;

[0060] The calculation formula of the sleep time T is as follows:

[0061] T = (D2×D3-D5)×t0.

[0062] The embodiments described above are merely descriptions of specific implementation methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A dual-channel coordinated arrester online monitoring system for online monitoring of arresters, characterized in that: It comprises n remote meters (1) and a background host (2); n≥2, and the IDs of the n remote meters (1) are 1 to n in sequence; the input end of the remote meter (1) is used to be electrically connected to the grounding end of the lightning arrester; Each of the remote transmission meters (1) comprises a wireless communication unit (11) and a main control module, and the background host (2) is provided with a first wireless communication module (21) and a second wireless communication module (22); The first wireless communication module (21) wirelessly communicates with the wireless communication unit (11) via a first channel (3); the second wireless communication module (22) wirelessly communicates with the wireless communication unit (11) via a second channel (4); the wireless communication unit (11) is electrically connected to the input end of the remote meter (1) via the main control module; The first wireless communication module (21) is used to send synchronization data to the wireless communication unit (11) through the first channel (3); The second wireless communication module (22) is used to receive monitoring data from the wireless communication unit (11) through the second channel (4); The wireless communication unit (11) is used for receiving synchronization data sent from a first wireless communication module (21) and sending monitoring data to a second wireless communication module (22).

2. The dual-channel coordinated arrester online monitoring system according to claim 1 is characterized in that: The wireless communication unit (11), the first wireless communication module (21) and the second wireless communication module (22) are all LoRa modules.

3. A dual-channel coordinated arrester online monitoring method, based on the dual-channel coordinated arrester online monitoring system according to any one of claims 1-2, characterized in that: The following steps are involved: S1. Start the remote meter (1); S2, setting a sleep time T of the wireless communication unit (11), and then the wireless communication unit (11) enters a sleep state; S3, after the sleep time T ends, the wireless communication unit (11) is awakened, the input end of the remote meter (1) receives the current signal from the lightning arrester and transmits it to the main control module, and then the main control module converts the current signal into monitoring data and transmits it to the wireless communication unit (11); S4, the wireless communication unit (11) switches to the first channel (3) and receives synchronization data sent by the first wireless communication module (21); S5, the remote meter (1) calculates the waiting time t required to send the monitoring data according to the synchronization data; S6. If the waiting time t required for sending monitoring data is greater than 0, the waiting time t is used as the sleep time T of the wireless communication unit (11) and the process returns to step S2; if it is equal to 0, the process proceeds to step S7; S7, the wireless communication unit (11) switches to the second channel (4) and sends monitoring data to the second wireless communication module (22); S8. Reset the sleep time T and return to step S2 to prepare for the next sending of monitoring data, thereby completing a dual-channel coordinated arrester online monitoring.

4. The dual-channel coordinated arrester online monitoring method according to claim 3 is characterized in that: The method for calculating the waiting time t required to send monitoring data in step S5 is as follows: If the ID of the target remote meter (1) in the synchronization data is the same as the ID of the remote meter (1), then t = 0; If the ID of the target remote meter (1) in the synchronization data is smaller than the ID of the remote meter (1), then t=((D0-D4)×D3-D5)×t0 Where: D4 is the ID of the target remote meter (1), D0 is the ID of the remote meter (1), D3 is the number of synchronous data frames continuously sent for each ID, D5 is the frame sequence number of the target remote meter (1), and t0 is the time taken to send each frame of synchronous data; If the ID of the target remote meter (1) in the synchronization data is greater than the ID of the remote meter (1), then t=((D2-D4+D0)×D3-D5)×t0 Where: D2 is the maximum ID.

5. The dual-channel coordinated arrester online monitoring method according to claim 4 is characterized in that: In step S8, the calculation formula of the sleep time T is as follows: T = (D2×D3-D5)×t0.

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