Bluetooth communication based field calibration system and method for alternating-current sampling measurement and control apparatus

Abstract

A Bluetooth communication based field calibration system and method for an alternating-current sampling measurement and control apparatus. The system comprises an alternating-current sampling measurement and control apparatus standard apparatus (1), a calibrated alternating-current sampling measurement apparatus (2), a Bluetooth data acquisition module (5) and an upper computer (6), wherein the alternating-current sampling measurement and control apparatus standard apparatus (1) comprises a Bluetooth sending module (3); the alternating-current sampling measurement and control apparatus standard apparatus (1) and the calibrated alternating-current sampling measurement apparatus (2) each comprise a Bluetooth receiving module (4); the Bluetooth sending module (3) is connected to the Bluetooth receiving module (4) in the alternating-current sampling measurement and control apparatus standard apparatus (1) and the Bluetooth receiving module (4) in the calibrated alternating-current sampling measurement apparatus (2); the Bluetooth receiving module (4) in the alternating-current sampling measurement and control apparatus standard apparatus (1) and the Bluetooth receiving module (4) in the calibrated alternating-current sampling measurement apparatus (2) are connected to the Bluetooth data acquisition module (5); and the Bluetooth data acquisition module (5) is connected to the upper computer (6). The system and method can improve the calibration efficiency and security of a sampling measurement and control apparatus.

Description

An on-site calibration system and method for an AC sampling and control device based on Bluetooth communication

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on October 31, 2023, with application number 202311438572.3 and invention name “A field calibration system and method for an AC sampling and control device based on Bluetooth communication”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application belongs to the field of electrical measurement technology and relates to an on-site calibration system and method for an AC sampling and measurement control device based on Bluetooth communication. Background Art

[0004] AC sampling, measurement, and control devices are a crucial component of integrated automation systems for substations and power plants, encompassing telecontrol communications, instrumentation, and relay protection. With the advancement and maturity of AC digital technology, they are widely used, replacing traditional power transmitters and electrical meters, in the construction, expansion, and renovation of power generation and supply companies. However, due to the lack of unified calibration standards and the high risk of operational calibration, on-site calibration of AC sampling, measurement, and control devices is often a complex process. The accuracy and other technical specifications of AC sampling, measurement, and control devices directly determine the proper functioning of power automation systems, making calibration of these devices essential.

[0005] Traditional on-site calibration methods for AC sampling, measurement, and control devices all use the standard source method to calculate errors and perform voltage, current, and other wiring on the AC sampling, measurement, and control device. During on-site calibration, it is necessary to find the corresponding device cabinet and remove the original wiring before connecting the standard voltage and current to the secondary circuit. Since AC sampling, measurement, and control devices have many channels, including not only voltage and current, but also parameters such as frequency, active power, reactive power, power factor, and phase angle, if traditional calibration methods are used, each channel must be individually wired and unwired. This is labor-intensive, complex, labor-intensive, and inefficient, and poses significant risks to the safe operation of the power plant. Therefore, a Bluetooth-based on-site calibration system and method for AC sampling, measurement, and control devices can utilize Bluetooth data transmission mode to resolve the complex wiring issues of on-site calibration. This also avoids safety hazards such as personnel mistakenly disconnecting wires due to walking into the wrong interval or forgetting to reinstall them after disconnecting them. This is of great significance for improving the calibration efficiency and safety of sampling, measurement, and control devices.

[0006] Summary of the Invention

[0007] The purpose of this application is to overcome the shortcomings of the above-mentioned prior art and provide an on-site calibration system and method for a sampling and measurement control device based on Bluetooth communication. The system and method can improve the calibration efficiency and safety of the sampling and measurement control device.

[0008] To achieve the above-mentioned purpose, the present application discloses an on-site calibration system for an AC sampling and control device based on Bluetooth communication, comprising an AC sampling and control device standard device, an AC sampling and measuring device to be calibrated, a Bluetooth data acquisition module and a host computer;

[0009] The standard device of the AC sampling and control device includes a Bluetooth sending module; the standard device of the AC sampling and control device and the AC sampling and measuring device being verified both include a Bluetooth receiving module, the Bluetooth sending module is connected to the Bluetooth receiving module in the standard device of the AC sampling and control device and the Bluetooth receiving module in the AC sampling and measuring device being verified, the Bluetooth receiving module in the standard device of the AC sampling and control device and the Bluetooth receiving module in the AC sampling and measuring device being verified are connected to the Bluetooth data acquisition module, and the Bluetooth data acquisition module is connected to the host computer.

[0010] The Bluetooth data acquisition module is connected to the host computer through the ZigBee network.

[0011] The Bluetooth sending module is connected to an external device.

[0012] The Bluetooth data acquisition module consists of a field collector and a field repeater.

[0013] The on-site calibration method of the Bluetooth communication AC sampling and control device described in this application includes the following steps:

[0014] 1) The Bluetooth sending module in the standard device of the AC sampling and control device sends voltage, current, power, frequency and power factor in real time;

[0015] 2) The Bluetooth receiving modules in the standard device of the AC sampling and control device and the calibrated AC sampling and measuring device receive the voltage, current, power, frequency and power factor sent by the Bluetooth sending module in the standard device of the AC sampling and control device in real time;

[0016] 3) The Bluetooth data acquisition module collects the voltage, current, power, frequency and power factor information received by the Bluetooth receiving module in the standard device of the AC sampling and control device and the AC sampling and measuring device being verified in real time, and sends it to the host computer.

[0017] Step 3) also includes:

[0018] The host computer calculates the basic error of the calibrated AC sampling and measuring device based on the received data.

[0019] Step 3) also includes:

[0020] It is judged whether the basic error of the AC sampling and measuring device being verified is qualified. When the basic error of the AC sampling and measuring device being verified is unqualified, an alarm signal is output.

[0021] Before step 1), it also includes:

[0022] The Bluetooth sending module is paired with the Bluetooth receiving module.

[0023] This application has the following beneficial effects:

[0024] The on-site calibration system and method for an AC sampling and control device based on Bluetooth communication described in this application utilizes Bluetooth communication wireless transmission to calibrate the AC sampling and control device during specific operation, avoiding accidents such as current open circuit or voltage short circuit caused by wiring and disconnection in the current and voltage secondary circuits. This not only saves manpower and time, but also greatly improves the safety of on-site calibration. It should be noted that this application utilizes Bluetooth wireless transmission to obtain the same data at the same time, reducing the time difference between the time of reading data from the storage memory element of the AC sampling and control device and the time of reading data from the storage memory element of the standard, greatly improving the accuracy of error calibration of the AC sampling and control device. Since there are many types of communication protocols for AC sampling and control devices, even the same protocol can vary due to different manufacturers and equipment models, which brings great difficulties to the calibration work of AC sampling and control devices. This application utilizes Bluetooth wireless transmission to achieve fully automatic calibration of various AC sampling and control devices, thereby improving the efficiency of maintenance and calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a system diagram of the present application;

[0026] FIG2 is a flow chart of the present application.

[0027] Among them, 1 is the standard device of AC sampling and measurement control device, 2 is the AC sampling and measurement device, 3 is the Bluetooth sending module, 4 is the Bluetooth receiving module, 5 is the Bluetooth data acquisition module, and 6 is the host computer. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only embodiments of a part of the present application, not all embodiments, and are not intended to limit the scope of disclosure of the present application. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts disclosed in the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of this application.

[0029] The accompanying drawings illustrate schematic diagrams of the structures of the embodiments disclosed herein. These figures are not drawn to scale; for the purpose of clarity, some details are exaggerated and some details may be omitted. The shapes of the various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art may design regions / layers with different shapes, sizes, and relative positions as needed.

[0030] 1 , the on-site calibration system for an AC sampling and control device based on Bluetooth communication described in the present application includes an AC sampling and control device standard device 1 , an AC sampling and measuring device to be calibrated 2 , a Bluetooth data acquisition module 5 , and a host computer 6 ;

[0031] The standard device 1 of the AC sampling and control device includes a Bluetooth sending module 3; the standard device 1 of the AC sampling and control device and the calibrated AC sampling and measuring device 2 both include a Bluetooth receiving module 4, the Bluetooth sending module 3 is connected to the Bluetooth receiving module 4 in the standard device 1 of the AC sampling and control device and the Bluetooth receiving module 4 in the calibrated AC sampling and measuring device 2, the Bluetooth receiving module 4 in the standard device 1 of the AC sampling and control device and the Bluetooth receiving module 4 in the calibrated AC sampling and measuring device 2 are connected to the Bluetooth data acquisition module 5, and the Bluetooth data acquisition module 5 is connected to the host computer 6.

[0032] 2 , the on-site calibration method for the Bluetooth communication AC sampling and control device described in this application includes the following steps:

[0033] 11) The Bluetooth sending module 3 in the standard device 1 of the AC sampling and control device sends voltage, current, power, frequency and power factor in real time;

[0034] 12) The Bluetooth receiving module 4 in the AC sampling and measurement control device standard device 1 and the calibrated AC sampling and measurement device 2 receives the voltage, current, power, frequency and power factor sent by the Bluetooth sending module 3 in the AC sampling and measurement control device standard device 1 in real time;

[0035] 13) The Bluetooth data acquisition module 5 collects the voltage, current, power, frequency and power factor information received by the Bluetooth receiving module 4 in the AC sampling and control device standard device 1 and the calibrated AC sampling and measuring device 2 in real time, and sends it to the host computer 6.

[0036] The Bluetooth sending module 3 is connected to the external device; the working process is:

[0037] 21) Turn on Bluetooth sending module 3;

[0038] 22) The Bluetooth sending module 3 in the standard device 1 of the AC sampling and control device sends a pre-signal to query whether the Bluetooth receiving module 4 in the verified AC sampling and measuring device 2 has received the Bluetooth pairing request;

[0039] 23) When the Bluetooth receiving module 4 in the calibrated AC sampling and measuring device 2 receives the Bluetooth pairing request sent by the Bluetooth sending module 3 in the AC sampling and measurement and control device standard device 1, the Bluetooth sending module 3 on the AC sampling and measurement and control device standard device 1 sends the voltage, current, power, frequency and power factor based on the Bluetooth protocol;

[0040] The Bluetooth receiving module 4 establishes a connection with an external device, and the working process is as follows:

[0041] 31) Turn on the Bluetooth sending module 3 and the Bluetooth receiving module 4;

[0042] 32) Confirm the Bluetooth connection and query whether the Bluetooth receiving module 4 in the AC sampling and control device standard device 1 and the AC sampling and measuring device 2 being verified has received the Bluetooth pairing request;

[0043] 33) Based on the Bluetooth communication protocol, receive the receiving instruction sent by the Bluetooth sending module 3 in the AC sampling and control device standard device 1 according to the demand, and confirm that the Bluetooth receiving module 4 in the AC sampling and control device standard device 1 and the AC sampling and measuring device 2 being verified can receive voltage, current, power, frequency and power factor;

[0044] The Bluetooth data acquisition module 5 establishes a connection with the external device, and the working process is as follows:

[0045] 41) The Bluetooth data acquisition module 5 is composed of a field collector and a field repeater. The Bluetooth data acquisition module 5 collects data on the voltage, current, power, frequency and power factor information received by the Bluetooth receiving module 4 in the AC sampling and control device standard device 1 and the calibrated AC sampling and measuring device 2;

[0046] 42) The collected data is transmitted to the host computer 6 via the ZigBee network. The host computer 6 collects and stores the data collected by the Bluetooth data acquisition module 5;

[0047] 43) ZigBee wireless serial port module can connect to multiple serial ports at the same time. The connection is carried out wirelessly. When data is transmitted, the data is first sent from the serial port to one module, and then the data is sent from the serial port to another module for reception. When the other module receives the data, it is sent out through the serial port.

[0048] The error calculation and analysis process is:

[0049] 51) The basic error of each parameter of the AC sampling and measuring device 2 being calibrated is determined using a separate standard meter calibration method. This involves separately recording the parameter data of the standard device and the device being tested after the standard device parameter output is completed. After the Bluetooth transmitter module 3 outputs voltage and current signals, the Bluetooth receiver module 4 records the voltage and current signal data received by the standard device 1 and the AC sampling and measuring device being calibrated 2.

[0050] 52) The basic error of each parameter of the calibrated AC sampling and measuring device 2 is expressed in the form of a reference error. The basic error of each calibration point of each parameter meets the requirements, and the error of the calibrated AC sampling and measuring device 2 is qualified.

[0051] The basic error calculation model is:

[0052] Wherein, γ is the basic error of the calibrated AC sampling and measuring device 2, W1 is the data of the calibrated AC sampling and measuring device 2 collected by the Bluetooth data acquisition module 5, and W2 is the data of the AC sampling and measurement control device standard device 1 collected by the Bluetooth data acquisition module 5; W N Data sent by Bluetooth sending module 3;

[0053] 53) When the basic error of each calibration point of a certain parameter does not meet the requirements, the error of the calibrated AC sampling and measuring device 2 is unqualified and an alarm signal is issued;

[0054] In addition, the upper computer 6 software records the parameters of the AC sampling and control device standard device 1 and the AC sampling and measuring device 2 to be verified, processes the data, and issues a verification report.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and not to limit them. Although the present application has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present application can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present application should be included in the scope of protection of the claims of the present application.

Claims

1. A field calibration system for an AC sampling and control device based on Bluetooth communication, characterized in that: It comprises an AC sampling and control device standard device (1), an AC sampling and measuring device to be verified (2), a Bluetooth data acquisition module (5) and a host computer (6); The AC sampling and control device standard device (1) comprises a Bluetooth sending module (3); the AC sampling and control device standard device (1) and the AC sampling and measuring device (2) to be verified both comprise a Bluetooth receiving module (4); the Bluetooth sending module (3) is connected to the Bluetooth receiving module (4) in the AC sampling and control device standard device (1) and the Bluetooth receiving module (4) in the AC sampling and measuring device (2) to be verified; the Bluetooth receiving module (4) in the AC sampling and control device standard device (1) and the Bluetooth receiving module (4) in the AC sampling and measuring device (2) to be verified are connected to a Bluetooth data acquisition module (5); and the Bluetooth data acquisition module (5) is connected to a host computer (6).

2. The on-site calibration method of the Bluetooth communication AC sampling and control device according to claim 1 is characterized in that: The Bluetooth data acquisition module (5) is connected to the host computer (6) via a ZigBee network.

3. The on-site calibration method of the Bluetooth communication AC sampling and control device according to claim 1 is characterized in that: The Bluetooth sending module (3) is connected to an external device.

4. The on-site calibration method of the Bluetooth communication AC sampling and control device according to claim 1 is characterized in that: The Bluetooth data collection module (5) is composed of a field collector and a field repeater.

5. A field calibration method for an AC sampling and control device based on Bluetooth communication, characterized in that: The on-site calibration system of the sampling and control device based on Bluetooth communication according to claim 1 comprises the following steps: 1) The Bluetooth transmission module (3) in the standard device (1) of the AC sampling and control device transmits voltage, current, power, frequency and power factor in real time; 2) The Bluetooth receiving module (4) in the AC sampling and measuring device standard device (1) and the calibrated AC sampling and measuring device (2) receives in real time the voltage, current, power, frequency and power factor sent by the Bluetooth sending module (3) in the AC sampling and measuring device standard device (1); 3) The Bluetooth data acquisition module (5) collects voltage, current, power, frequency and power factor information received by the Bluetooth receiving module (4) in the AC sampling and control device standard device (1) and the AC sampling and measuring device (2) being verified in real time, and sends it to the host computer (6).

6. The on-site calibration method of the Bluetooth communication AC sampling and control device according to claim 5 is characterized in that: Step 3) also includes: The host computer (6) calculates the basic error of the calibrated AC sampling and measuring device (2) based on the received data.

7. The on-site calibration method of the Bluetooth communication AC sampling and control device according to claim 6 is characterized in that: Step 3) also includes: It is determined whether the basic error of the AC sampling and measuring device (2) being checked is qualified, and when the basic error of the AC sampling and measuring device (2) being checked is unqualified, an alarm signal is output.

8. The on-site calibration method of the Bluetooth communication AC sampling and control device according to claim 5 is characterized in that: Before step 1), it also includes: The Bluetooth sending module (3) and the Bluetooth receiving module (4) are paired.

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