High-voltage wireless phase checking method and phase measuring device

Abstract

The invention belongs to the technical field of phase measurement, and particularly relates to a high-voltage wireless nuclear phase method and a phase measurement device.The method comprises the steps that a first slave collects a voltage signal of a first line to be measured, converts the voltage signal into a first square wave signal and sends the first square wave signal to a host in a wireless mode; the host receives the first square wave signal, records feature information of the first square wave signal, and generates an analog square wave signal in the host according to the feature information; the second slave machine collects a voltage signal of a second to-be-detected line, converts the voltage signal into a second square wave signal, and sends the second square wave signal to the host in a wireless mode; and the host receives the second square wave signal, compares the analog square wave signal with the second square wave signal, and calculates the phase difference between the first to-be-detected line and the second to-be-detected line. According to the method, the host is matched with the two slaves, and the host does not need to be configured with two wireless modules to work at the same time, so that the problem of same-frequency interference of wireless signals can be avoided, and the communication distance and the stability of phase checking operation are greatly improved.

Description

Technical Field

[0001] This application relates to the field of high-voltage phase measurement technology, and in particular to a high-voltage wireless phase comparison method and phase measurement device. Background Technology

[0002] High-voltage phase gauging is mainly divided into wired and wireless phase gauging. Traditional wired phase gauging usually requires workers to connect long cables between the high-voltage device and the ground, which is not only cumbersome and complex to operate, but also carries a high risk. While wireless phase gauging eliminates the need for physical wiring, its core challenge lies in synchronizing the dual signals. Currently, the mainstream wireless phase gauging method typically uses two ASK wireless modules at the master end, each communicating one-to-one with two slave units, achieving synchronization by simultaneously receiving signals. However, this technical solution has a short transmission distance (usually within 50m), and because dual signals are transmitted simultaneously, it is highly susceptible to co-channel interference, thus affecting the stability and accuracy of phase measurements.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art.

[0004] Application content In view of at least one of the above technical problems, this application provides a high-voltage wireless phase comparison method and a phase measurement device.

[0005] In a first aspect, a high-voltage wireless phase comparison method is provided, applied to a phase measurement device, the phase measurement device including a master unit, a first slave unit, and a second slave unit, the method including the following steps: The first slave device collects the voltage signal of the first line under test, converts it into a first square wave signal, and sends it to the host device wirelessly. The host receives the first square wave signal, records the characteristic information of the first square wave signal, and generates a simulated square wave signal inside the host based on the characteristic information; the frequency and phase of the simulated square wave signal are consistent with the first square wave signal. The second slave device collects the voltage signal of the second line under test, converts it into a second square wave signal, and sends it to the host wirelessly. The host receives the second square wave signal, compares the analog square wave signal with the second square wave signal, and calculates the phase difference between the first and second lines under test.

[0006] This method, through the cooperation of one master unit and two slave units, and without requiring the master unit to be configured with two wireless modules working simultaneously, can avoid the problem of co-channel interference of wireless signals, and greatly improve the communication distance and stability of phase operation.

[0007] In some possible implementations, the feature information includes the initial timestamp of the effective edge of the first square wave signal arriving at the host, the signal period of the first square wave signal, and the duty cycle.

[0008] In some possible implementations, generating an analog square wave signal includes: When the host detects the valid edge of the first square wave signal, it records the initial timestamp and starts the internal timer to synchronously trigger the output of the simulated edge. The host configures a square wave simulation timer based on the initial timestamp, the signal period and duty cycle of the first square wave signal, and generates a simulated square wave signal that is consistent with the first square wave signal in frequency and phase.

[0009] In some possible implementations, the first slave device acquires the voltage signal of the first line under test and converts it into a first square wave signal, including: The first slave device detects the edge of the first square wave signal and records the time of the rising or falling edge of the first square wave signal to obtain the zero-crossing time of the voltage signal.

[0010] In some possible implementations, the phase difference between the first line under test and the second line under test is calculated, including: The phase difference is calculated using the following formula: , among which, T diff To simulate the time difference between adjacent rising or falling edges of the square wave signal and the second square wave signal, T is the signal period of the first square wave signal.

[0011] In some possible implementations, after calculating the phase difference between the first and second lines under test, the following steps are also included: Determine whether the phase difference is within the preset in-phase range; if the phase difference is between 0° and 20°, then the first test line and the second test line are determined to be in phase; otherwise, they are determined to be out of phase.

[0012] Secondly, a phase measuring device is provided, the device comprising: The first slave device and the second slave device have the same structure. The first slave device includes a signal acquisition unit, a zero-crossing comparison unit and a first wireless transmission unit. Both the first slave device and the second slave device are configured to convert the acquired high-voltage sinusoidal voltage signal into a square wave signal and then send it to the host. The host includes a second wireless transmission unit and a microcontroller unit. The second wireless transmission unit is used to receive a first square wave signal from a first slave device and a second square wave signal from a second slave device in a time-division manner. The microcontroller unit is used to generate an analog square wave signal inside the host based on the characteristic information of the received first square wave signal; calculate the time difference between the analog square wave signal and the subsequently received second square wave signal, and then obtain the phase difference.

[0013] In some possible implementations, the second wireless transmission unit is used to establish communication with the first slave device in a first time period to receive the first square wave signal, and to establish communication with the second slave device in a second time period to receive the second square wave signal.

[0014] In some possible implementations, the zero-crossing comparator unit includes a signal amplifier and a zero-crossing comparator. The signal amplifier is used to amplify the acquired high-voltage sinusoidal voltage signal, and the zero-crossing comparator is used to convert the amplified high-voltage sinusoidal voltage signal into a first square wave signal or a second square wave signal.

[0015] In some possible implementations, the host computer also includes a display unit connected to the microcontroller unit, which is used to display the calculated phase difference value and phase judgment result in real time.

[0016] The present application will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a structural diagram of the phase measurement device provided in this embodiment; Figure 2 A flowchart of the high-voltage wireless phase comparison method provided in the embodiments of this application; Figure 3 This is a schematic diagram of phase measurement. Detailed Implementation

[0019] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0020] In related technologies, high-voltage phase matching is mainly divided into wired phase matching and wireless phase matching. Wired phase matching has low safety and is cumbersome to operate. Traditional wired phase matching requires the use of long cables to connect the high-voltage device to the ground, which is complex and has a high risk factor. Existing wireless phase matching has a short transmission distance and is susceptible to interference. The current mainstream wireless phase matching methods usually require the master to receive signals from two slave devices simultaneously to achieve synchronization, such as using two ASK modules for one-to-one communication. This method usually has a limited transmission distance, generally within 50 meters, and is easily affected by wireless signal interference when receiving signals simultaneously, leading to unstable measurements.

[0021] Figure 1 This is a structural diagram of the phase measurement device provided in this embodiment. Figure 1 As shown, this embodiment provides a phase measurement device, which includes a first slave device 100, a second slave device 200, and a master device 300.

[0022] The first slave device 100 and the second slave device 200 have the same structure. The first slave device 100 includes a signal acquisition unit, a zero-crossing comparison unit, and a first wireless transmission unit. Both the first slave device 100 and the second slave device 200 are configured to convert the acquired high-voltage sinusoidal voltage signal into a square wave signal and then send it to the host device 300. The host device 300 includes a second wireless transmission unit and a microcontroller unit. The second wireless transmission unit is used to receive the first square wave signal from the first slave device 100 and the second square wave signal from the second slave device 200 in a time-division manner. The microcontroller unit is used to generate an analog square wave signal inside the host device 300 based on the characteristic information of the received first square wave signal; calculate the time difference between the analog square wave signal and the subsequently received second square wave signal, and then obtain the phase difference.

[0023] It is understandable that the host 300 can generate an analog square wave signal based on the received first square wave signal. The host 300 can also generate an analog square wave signal based on the received second square wave signal; there is no limitation on this.

[0024] In practical applications, the first slave unit 100 and the second slave unit 200 are respectively hung on the phases requiring phase comparison via insulating rods, while the user holds the main unit 300. Subsequently, the main unit 300 generates an analog square wave signal based on the first square wave signal from the first slave unit 100 or the second square wave signal from the second slave unit 200. This analog square wave signal is then compared with the square wave signal from the other slave unit to calculate the phase difference.

[0025] In some embodiments, the second wireless transmission unit is configured to establish communication with the first slave 100 in a first time period to receive a first square wave signal, and to establish communication with the second slave 200 in a second time period to receive a second square wave signal.

[0026] During the first time period, the host 300 controls the operating frequency band or address code of the second wireless transmission unit, enabling it to establish a dedicated communication link with the first slave 100 to receive the first square wave signal. After the characteristic information of the first square wave signal is recorded, the link is disconnected. The host 300 then switches the configuration of the second wireless transmission unit to establish a communication link with the second slave 200 to receive the second square wave signal. In this way, the host 300 only needs to be equipped with one wireless receiving module to complete the task. This not only reduces hardware costs, but more importantly, it completely eliminates the intermodulation interference problem caused by the simultaneous operation of two receiving modules mentioned in the background art, significantly improving signal reception sensitivity and transmission distance.

[0027] In some embodiments, the zero-crossing comparison unit includes a signal amplifier and a zero-crossing comparator. The signal amplifier is used to amplify the acquired high-voltage sinusoidal voltage signal, and the zero-crossing comparator is used to convert the amplified high-voltage sinusoidal voltage signal into a first square wave signal or a second square wave signal.

[0028] The signal amplifier and zero-crossing comparator are connected in series. Understandably, the input of the signal amplifier is coupled with the induced voltage signal, and the output of the signal amplifier is connected to the non-inverting input of the zero-crossing comparator. The inverting input of the zero-crossing comparator is grounded, and its output is connected to the slave MCU.

[0029] During operation, the acquired signals often have small amplitudes and are accompanied by noise. The signal amplifier first amplifies the signal amplitude to a processable range. Subsequently, the zero-crossing comparator converts the analog sine wave into a rectangular square wave, outputting a high level during the positive half-cycle and a low level during the negative half-cycle. In this way, the circuit structure is simple and efficient, accurately extracting the phase information (zero-crossing point) of the sine wave while filtering out the influence of amplitude fluctuations, ensuring that the square wave signal sent to the host 300 has clear edges and accurate phase.

[0030] In some embodiments, the host 300 further includes a display unit connected to the microcontroller unit for displaying the calculated phase difference value and phase judgment result in real time.

[0031] The microcontroller unit sends the calculated phase difference value and the determination result to the display unit in real time. The display unit can use a graphical interface to intuitively indicate the results.

[0032] Figure 2 A flowchart illustrating the high-voltage wireless phase comparison method provided in this application embodiment. Figure 2 As shown, the above-mentioned phase measurement device implements a high-voltage wireless phase comparison method, which includes the following steps: In step S100, the first slave device 100 collects the voltage signal of the first line under test, converts it into a first square wave signal, and sends it to the host device 300 wirelessly. In step S100, the first slave device 100 is attached to the first line under test, collects the voltage signal of the line, and shapes it into a first square wave signal. Subsequently, the first slave device 100 transmits the square wave signal to the host device 300 through a wireless communication module.

[0033] In step S200, the host 300 receives the first square wave signal, records the characteristic information of the first square wave signal, and generates a simulated square wave signal inside the host 300 according to the characteristic information; the frequency and phase of the simulated square wave signal are consistent with the first square wave signal. In step S200, after receiving the first square wave signal, the host 300 does not continuously occupy the wireless channel. The host 300 parses the first square wave signal and records its characteristic information. Based on this characteristic information, it generates a simulated square wave signal.

[0034] In step S300, the second slave device 200 collects the voltage signal of the second line under test, converts it into a second square wave signal, and sends it to the host device 300 wirelessly. In step S300, the second slave device 200 is connected to the second line under test, collects the voltage signal and converts it into a second square wave signal, and sends it to the master device 300.

[0035] In step S400, the host 300 receives the second square wave signal, compares the analog square wave signal with the second square wave signal, and calculates the phase difference between the first line under test and the second line under test.

[0036] In step S400, after receiving the second square wave signal, the host 300 compares the second square wave signal with the analog square wave signal, calculates the time difference between the two, and thus obtains the phase difference.

[0037] The high-voltage wireless phase comparison method provided in this embodiment uses a host 300 and two slave devices in cooperation. The host 300 does not need to be configured with two wireless modules to work at the same time, which can avoid the problem of co-channel interference of wireless signals and greatly improve the communication distance and stability of phase comparison operation.

[0038] In some embodiments, the feature information includes the initial timestamp of the effective edge of the first square wave signal arriving at the host 300, the signal period of the first square wave signal, and the duty cycle.

[0039] Understandably, when the host 300 receives the first square wave signal via the wireless module, its input acquisition unit immediately activates, recording the arrival time of the first rising edge as the initial timestamp. It then continues to monitor subsequent falling and rising edges, calculating the time difference between adjacent edges to accurately determine the signal period and duty cycle. By recording these three parameters, it ensures that the analog square wave signal generated by the host 300 not only has a consistent frequency but also a consistent phase start point and waveform shape. This guarantees the high fidelity of the analog square wave signal and minimizes system errors introduced during the simulation process.

[0040] In some embodiments, generating an analog square wave signal includes: When the host 300 detects the valid edge of the first square wave signal, it records the initial timestamp and starts the internal timer to synchronously trigger the output of the simulated edge. The host 300 configures the square wave simulation timer according to the initial timestamp, the signal period and duty cycle of the first square wave signal, and generates a simulated square wave signal that is consistent with the first square wave signal in frequency and phase.

[0041] Understandably, after the host 300 detects the valid edge of the first square wave signal and records the initial timestamp, the host 300 will start the internal wave timer as a square wave simulation timer. The host 300 writes the recorded signal period into the timer's auto-reload register and writes the result of period × duty cycle into the comparison register. The host 300 sets the initial value of the timer counter based on the difference between the current system time and the recorded initial timestamp, compensating for processing delays and ensuring that the timer starts counting precisely with the phase point of the original signal. The square wave simulation timer starts and begins to automatically toggle the level according to the set parameters, generating a continuous square wave, i.e., a simulated square wave signal.

[0042] In some embodiments, the first slave device 100 acquires the voltage signal of the first line under test and converts it into a first square wave signal, including: The first slave device 100 detects the edge of the first square wave signal and records the time of the rising or falling edge of the first square wave signal to obtain the zero-crossing time of the voltage signal.

[0043] Thus, by recording the edge time of the square wave to obtain the zero-crossing time, the phase measurement of the analog square wave signal is cleverly transformed into the time measurement of the digital signal. The zero-crossing point is the most stable characteristic of the phase information of the AC signal, which is not affected by voltage amplitude fluctuations. Therefore, it can be adapted to line measurements of different voltage levels and has strong versatility.

[0044] In some embodiments, calculating the phase difference between the first line under test and the second line under test includes: The phase difference is calculated using the following formula: , among which, Tdiff To simulate the time difference between adjacent rising or falling edges of the square wave signal and the second square wave signal, T is the signal period of the first square wave signal.

[0045] In some embodiments, after calculating the phase difference between the first line under test and the second line under test, the method further includes: Determine whether the phase difference is within the preset in-phase range; if the phase difference is between 0° and 20°, then the first test line and the second test line are determined to be in phase; otherwise, they are determined to be out of phase.

[0046] Thus, a tolerance range of 0° to 20° is set to fully account for the small phase shift caused by impedance differences in long-distance transmission lines and the inherent errors of the measurement system.

[0047] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0048] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] The terms "coupled," "connected," or "connected" in the instruction manual include both direct and indirect connections. An indirect connection is a connection made through an intermediate medium, such as a connection made through an electrically conductive medium, which may have parasitic inductance or capacitance. An indirect connection may also include connections made through other active or passive devices to achieve the same or similar functional purpose, such as connections made through circuits or components such as switches or follower circuits.

[0051] In the detailed description of this specification, reference is made to the accompanying drawings, which form a part thereof, wherein like reference numerals always denote like parts, and wherein exemplary embodiments are shown by way of example that may be implemented. It should be understood that other embodiments may be utilized, and structural or logical changes may be made, without departing from the scope of this application. Therefore, the following detailed description should not be considered limiting.

[0052] The various operations in the specification may be described sequentially as multiple discrete actions or operations in a manner most conducive to understanding the claimed subject matter. However, the order of description should not be construed as implying that these operations must be sequentially related. Specifically, these operations may not be performed in the order presented. The described operations may be performed in a different order than in the described embodiments. Various additional operations may be performed in additional embodiments and / or the described operations may be omitted.

[0053] Various components and devices may be referred to or shown in the singular (e.g., “MOS transistor”, “transistor”, “switch”, etc.) in this document, but only for the convenience of discussion, and any element referred to in the singular may include multiple such elements as taught herein.

[0054] The above are merely preferred embodiments of this application and do not constitute any limitation on this application. Any person skilled in the art can make many possible variations and modifications to the technical solution of this application, or modify it into equivalent embodiments, without departing from the scope of the technical solution of this application. Therefore, all equivalent changes made based on the shape, structure, and principle of this application without departing from the content of the technical solution of this application should be covered within the protection scope of this application.

Claims

1. A high-voltage wireless phase comparison method, applied to a phase measurement device, the phase measurement device comprising a master unit, a first slave unit, and a second slave unit, characterized in that, The method includes the following steps: The first slave device acquires the voltage signal of the first line under test, converts it into a first square wave signal, and transmits it to the host device wirelessly. The host receives the first square wave signal, records the characteristic information of the first square wave signal, and generates a simulated square wave signal inside the host according to the characteristic information; the frequency and phase of the simulated square wave signal are consistent with the first square wave signal. The second slave device acquires the voltage signal of the second line under test, converts it into a second square wave signal, and transmits it to the host device wirelessly. The host receives the second square wave signal, compares the analog square wave signal with the second square wave signal, and calculates the phase difference between the first line under test and the second line under test.

2. The high-voltage wireless phase comparison method according to claim 1, characterized in that, The feature information includes the initial timestamp of the effective edge of the first square wave signal arriving at the host, the signal period of the first square wave signal, and the duty cycle.

3. The high-voltage wireless phase comparison method according to claim 2, characterized in that, The generated analog square wave signal includes: When the host detects a valid edge of the first square wave signal, it records the initial timestamp and starts an internal timer to synchronously trigger the output of the simulated edge. The host computer configures a square wave simulation timer based on the initial timestamp, the signal period and duty cycle of the first square wave signal, and generates a simulated square wave signal that is consistent with the first square wave signal in frequency and phase.

4. The high-voltage wireless phase comparison method according to claim 1, characterized in that, The first slave device acquires the voltage signal of the first line under test and converts it into a first square wave signal, including: The first slave device detects the edge of the first square wave signal and records the time of the rising or falling edge of the first square wave signal to obtain the zero-crossing time of the voltage signal.

5. The high-voltage wireless phase comparison method according to claim 1, characterized in that, The calculation of the phase difference between the first line under test and the second line under test includes: The phase difference is calculated using the following formula: , among which, T diff The time difference between adjacent rising edges or adjacent falling edges of the simulated square wave signal and the second square wave signal is T, where T is the signal period of the first square wave signal.

6. The high-voltage wireless phase comparison method according to claim 1, characterized in that, After calculating the phase difference between the first line under test and the second line under test, the method further includes: Determine whether the phase difference is within a preset in-phase range; if the phase difference is between 0° and 20°, then determine that the first test line and the second test line are in phase; otherwise, determine that they are out of phase.

7. A phase measuring device, characterized in that, The device includes: The first slave device and the second slave device have the same structure. The first slave device includes a signal acquisition unit, a zero-crossing comparison unit and a first wireless transmission unit. Both the first slave device and the second slave device are configured to convert the acquired high-voltage sinusoidal voltage signal into a square wave signal and then send it to the host device. The host includes a second wireless transmission unit and a microcontroller unit. The second wireless transmission unit is used to receive a first square wave signal from the first slave device and a second square wave signal from the second slave device in a time-division multiplexing manner. The microcontroller unit is used to generate a simulated square wave signal inside the host based on the characteristic information of the received first square wave signal; calculate the time difference between the simulated square wave signal and the subsequently received second square wave signal, and then obtain the phase difference.

8. The phase measuring device according to claim 7, characterized in that, The second wireless transmission unit is used to establish communication with the first slave device in a first time period to receive the first square wave signal, and to establish communication with the second slave device in a second time period to receive the second square wave signal.

9. The phase measuring device according to claim 7, characterized in that, The zero-crossing comparison unit includes a signal amplifier and a zero-crossing comparator. The signal amplifier is used to amplify the acquired high-voltage sinusoidal voltage signal, and the zero-crossing comparator is used to convert the amplified high-voltage sinusoidal voltage signal into a first square wave signal or a second square wave signal.

10. The phase measuring device according to claim 7, characterized in that, The host also includes a display unit, which is connected to the microcontroller unit and is used to display the calculated phase difference value and phase judgment result in real time.

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