Multi-channel wireless synchronous current acquisition device

Abstract

The utility model provides a multi-channel wireless synchronous current acquisition device, which is characterized in that a high-voltage detection sub-device, a low-voltage detection sub-device and a calculation sub-device are internally provided with communication sub-devices for wireless radio frequency communication; and the communication sub-device is used for providing a wireless path for bidirectional data interaction between the calculation sub-device and the high-voltage detection sub-device and between the calculation sub-device and the low-voltage detection sub-device. A wireless communication mode is adopted, and through multi-channel wireless synchronous current acquisition and accurate calculation and analysis of multi-channel current, phase difference data of high and low voltage sides of the current transformer in operation and accurate three-phase phase relation data can be effectively judged, the state of the current transformer can be evaluated, and the power consumption standard of a user can be effectively monitored. And electricity stealing behaviors of users are avoided.

Description

Technical Field

[0001] The utility model relates to the field of mutual inductor detection, in particular to a multi-channel wireless synchronous current acquisition device. Background Art

[0002] At present, the current transformers installed by high-voltage users (typically 6kV to 35kV) are generally tested by using a current transformer ratio tester. Since it does not have the function of synchronously sampling and measuring the high-voltage and low-voltage sides of the current transformer, it is impossible to obtain the phase difference parameters between the high-voltage current and the low-voltage current of the current transformer.

[0003] The existing transformer ratio tester generally uses a high-voltage clamp ammeter to collect primary current, and transmits the collected data to the tester handheld host through wireless communication. The low-voltage clamp ammeter collects secondary current and is connected to the tester handheld host through a wired method to independently complete the measurement of the high-voltage current and low-voltage current of the current transformer. The handheld host performs corresponding calculations to obtain the transformer ratio. The tester can generally only measure the current values ​​of high-voltage current and low-voltage current. Because it does not synchronize AD conversion, it has no phase difference (angle) test function. At the same time, it can generally only measure two channels of high-voltage current and low-voltage current.

[0004] Existing transformer ratio testers are often unable to meet the needs of transformer phase error testing and multi-channel synchronous current acquisition testing. Utility Model Content

[0005] In order to overcome the deficiencies of the prior art, the utility model aims to provide a multi-channel wireless synchronous current acquisition device.

[0006] To achieve the above purpose, the utility model provides the following solutions:

[0007] A multi-channel wireless synchronous current acquisition device comprises a high-voltage detection sub-device for high-voltage side current acquisition, a low-voltage detection sub-device for low-voltage side current acquisition and a calculation sub-device for calculating and displaying a transformer ratio and a phase value, wherein the calculation sub-device is respectively connected to the high-voltage detection sub-device and the low-voltage detection sub-device, and the high-voltage detection sub-device, the low-voltage detection sub-device and the calculation sub-device are all equipped with a communication sub-device for wireless radio frequency communication, and the communication sub-device is used to provide a wireless channel for two-way data interaction between the calculation sub-device and the high-voltage detection sub-device and the low-voltage detection sub-device.

[0008] Preferably, the communication sub-device includes a first synchronous RF module, a second synchronous RF module and a third synchronous RF module; the third synchronous RF module is respectively connected to the first synchronous RF module and the second synchronous RF module; the first synchronous RF module, the second synchronous RF module and the third synchronous RF module are respectively built into the high-voltage detection sub-device, the low-voltage detection sub-device and the computing sub-device.

[0009] Preferably, the high-voltage detection sub-device includes: a first current transformer, a first AD sampling module and a first single-chip microcomputer module connected in sequence; the first current transformer is arranged on the high-voltage line to be tested; the first single-chip microcomputer module is also connected to the communication sub-device in the high-voltage detection sub-device, and the first single-chip microcomputer module is configured to control the time difference of the received signal between the communication sub-device in the high-voltage detection sub-device and other communication sub-devices, and control the sampling start time of the first AD sampling module.

[0010] Preferably, the low-voltage detection sub-device includes: a second current transformer, a second AD sampling module and a second single-chip microcomputer module connected in sequence; the second current transformer is arranged on the low-voltage line to be tested; the second single-chip microcomputer module is also connected to the communication sub-device in the low-voltage detection sub-device, and the second single-chip microcomputer module is configured to control the time difference of the received signal between the communication sub-device in the low-voltage detection sub-device and other communication sub-devices, and control the sampling start time of the second AD sampling module.

[0011] Preferably, the computing sub-device includes: a third single-chip microcomputer module and a human-machine interface module that are interconnected; the third single-chip microcomputer module is also connected to the communication sub-device in the computing sub-device, and the third single-chip microcomputer module is configured to control the communication sub-device in the computing sub-device to send and receive data to other communication sub-devices, and determine the transformer ratio and phase value based on the received data; the human-machine interface module is configured to display the working data and calculation results of the third single-chip microcomputer module, and obtain the user's usage instructions and provide corresponding visual interface prompts.

[0012] Preferably, the third single-chip microcomputer module controls the communication sub-device in the computing sub-device to send data to other communication sub-devices in a synchronous manner.

[0013] Preferably, the communication sub-devices in the high voltage detection sub-device and the low voltage detection sub-device receive data in a synchronous reception manner.

[0014] Preferably, the time difference of receiving the signal is ≤10uS.

[0015] Preferably, there are multiple high voltage detection sub-devices and / or low voltage detection sub-devices.

[0016] Preferably, the high-voltage detection sub-device, the low-voltage detection sub-device and the calculation sub-device are all equipped with a built-in power supply sub-device for supplying power.

[0017] According to the specific embodiments provided by the utility model, the utility model discloses the following technical effects:

[0018] The utility model provides a multi-channel wireless synchronous current acquisition device. All internal modules adopt wireless communication mode. Through multi-channel wireless synchronous current acquisition, accurate calculation and analysis of multi-channel current are performed, which can effectively judge the phase difference data of the high and low voltage sides of the running current transformer and the accurate three-phase phase relationship data, evaluate the current transformer status, effectively monitor the user's electricity usage specifications, and put an end to the user's electricity theft. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 A schematic diagram of the structure of the device provided in the embodiment of the utility model;

[0021] Figure 2 A schematic diagram of the device layout provided in the embodiment of the utility model;

[0022] Figure 3 A schematic diagram of a control host wireless synchronous current acquisition implementation process provided by an embodiment of the utility model;

[0023] Figure 4 A schematic diagram of the implementation flow of wireless synchronous current collection from a slave provided in an embodiment of the utility model.

[0024] Description of reference numerals:

[0025] 1-high voltage detection sub-device, 2-operating lever, 3-low voltage detection sub-device, 4-calculation sub-device. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] The purpose of the utility model is to provide a multi-channel wireless synchronous current acquisition device, which can accurately calculate and analyze multi-channel currents through multi-channel wireless synchronous current acquisition, and effectively determine the phase difference data of the high and low voltage sides of the running current transformer and the accurate three-phase phase relationship data.

[0028] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0029] Figure 1 The schematic diagram of the device structure provided by the embodiment of the utility model is as follows: Figure 1 As shown, the utility model provides a multi-channel wireless synchronous current acquisition device, including a high-voltage detection sub-device 1 for high-voltage side current acquisition, a low-voltage detection sub-device 3 for low-voltage side current acquisition and a calculation sub-device 4 for calculating and displaying the transformer ratio and phase value, the calculation sub-device 4 is respectively connected to the high-voltage detection sub-device 1 and the low-voltage detection sub-device 3, the high-voltage detection sub-device 1, the low-voltage detection sub-device 3 and the calculation sub-device 4 are all built-in with a communication sub-device for wireless radio frequency communication, the communication sub-device is used to provide a wireless channel for two-way data interaction between the calculation sub-device 4 and the high-voltage detection sub-device 1 and the low-voltage detection sub-device 3.

[0030] Specifically, Figure 2 As shown, the various components of the multi-channel wireless synchronous current acquisition device in this embodiment constitute a complete set of devices, wherein the high-voltage detection sub-device 1 can use a wireless high-voltage current open clamp meter, the low-voltage detection sub-device 3 can use a wireless low-voltage current open clamp meter, and the calculation sub-device 4 can use a wireless palm host. The wireless high-voltage current open clamp meter (hereinafter referred to as the high-voltage slave) typically uses an insulating rod to connect the high-voltage slave. The user uses the insulating rod to operate the high-voltage slave to install it on the high-voltage line (high-voltage equipotential operation) to complete the high-voltage (primary side) current acquisition. The wireless low-voltage current open clamp meter (hereinafter referred to as the low-voltage slave) typically uses a low-voltage open clamp meter type, and the test line is clamped into the opening to complete the low-voltage (secondary side) current acquisition. The wireless palm host (hereinafter referred to as the control host) completes the real-time periodic display refresh and corresponding parameter setting of the synchronous current acquisition data of the high-voltage slave and the low-voltage slave. There is no physical connection between the control host and the high-voltage slave and the low-voltage slave, and wireless communication is used to complete two-way data interaction.

[0031] Preferably, there are multiple high voltage detection sub-devices 1 and / or multiple low voltage detection sub-devices 3 .

[0032] Specifically, the complete set of devices in this embodiment supports synchronous acquisition of up to 3 high-voltage slaves and 3 low-voltage slaves, and supports wireless synchronous current acquisition of a total of 6 current channels.

[0033] Preferably, the high-voltage detection sub-device 1 includes: a first current transformer, a first AD sampling module and a first single-chip microcomputer module connected in sequence; the first current transformer is arranged on the high-voltage line to be measured; the first single-chip microcomputer module is also connected to the communication sub-device in the high-voltage detection sub-device 1, and the first single-chip microcomputer module is configured to control the time difference between the received signals of the communication sub-device in the high-voltage detection sub-device 1 and other communication sub-devices, and control the sampling start time of the first AD sampling module. The low-voltage detection sub-device 3 includes: a second current transformer, a second AD sampling module and a second single-chip microcomputer module connected in sequence; the second current transformer is arranged on the low-voltage line to be measured; the second single-chip microcomputer module is also connected to the communication sub-device in the low-voltage detection sub-device 3, and the second single-chip microcomputer module is configured to control the time difference between the received signals of the communication sub-device in the low-voltage detection sub-device 3 and other communication sub-devices, and control the sampling start time of the second AD sampling module. The computing sub-device 4 includes: a third single-chip microcomputer module and a human-machine interface module connected to each other; the third single-chip microcomputer module is also connected to the communication sub-device in the computing sub-device 4, and the third single-chip microcomputer module is configured to control the communication sub-device in the computing sub-device 4 to send and receive data to other communication sub-devices, and determine the transformer ratio and phase value according to the received data; the human-machine interface module is configured to display the working data and calculation results of the third single-chip microcomputer module, and obtain the user's use instructions and perform corresponding visual interface prompts. The third single-chip microcomputer module controls the communication sub-device in the computing sub-device 4 to send data to other communication sub-devices in a synchronous manner. The communication sub-devices in the high-voltage detection sub-device 1 and the low-voltage detection sub-device 3 receive data in a synchronous manner. The time difference of the received signal is ≤10uS. The high-voltage detection sub-device 1, the low-voltage detection sub-device 3 and the computing sub-device 4 are all built-in with a power supply sub-device for power supply.

[0034] Specifically, the specific composition of the internal components in this embodiment is as follows:

[0035] The high-voltage slave includes a 0.5S-level open-type electromagnetic current transformer, a synchronous radio frequency module, a high-precision AD sampling module, a single-chip microcomputer module, and a power supply module.

[0036] The low-voltage slave includes a 0.5S-level open-type electromagnetic current transformer, a synchronous radio frequency module, a high-precision AD sampling module, a single-chip microcomputer module, and a power supply module.

[0037] The control host includes a synchronous radio frequency module, a single-chip computer module, a human-machine interface module, and a power supply module.

[0038] Furthermore, the synchronous RF module has two features: first, a two-way communication function to complete the two-way data interaction between the control host and the high-voltage slave and the low-voltage slave; second, a synchronous control function to achieve the synchronous reception of the high-voltage slave and the low-voltage slave by the synchronous reception of the synchronous pulse signal sent by the control host, and to achieve wireless synchronization of the high-voltage slave and the low-voltage slave. The synchronous RF module has the synchronous control function feature that the module has the function of sending synchronous pulses. The synchronous RF module transmitter (control host) sends a synchronous pulse signal, and multiple synchronous RF module receivers (high-voltage slaves and low-voltage slaves) will all receive the synchronous pulse signal sent by the synchronous RF module transmitter (control host), and the time difference between them receiving the synchronous pulse signal is ≤10uS.

[0039] Furthermore, the high-precision AD sampling module includes a relay-controlled range switching module and a 16-bit high-precision single-channel AD sampling system.

[0040] Furthermore, the single-chip microcomputer module contained in the high-voltage slave and the low-voltage slave is used to control the synchronous RF module and the high-precision AD sampling module to achieve synchronous current collection.

[0041] In addition, the power modules contained in the high-voltage slave and the low-voltage slave are used to supply power to the functional modules and systems of the high-voltage slave and the low-voltage slave, and typically adopt a mature rechargeable battery solution.

[0042] As an optional implementation, the human-machine interface module contained in the control host has a liquid crystal interface and key input human-machine interaction, completes the real-time periodic display refresh of the calculated parameters after the synchronous current acquisition of the high-voltage slave and the low-voltage slave, as well as various advanced function expansion applications and corresponding parameter setting functions. The power module contained in the control host is used to power the various modules and systems of the control host, and typically adopts a mature rechargeable battery solution. The control host has other external expansion interfaces, such as USB interface, SD card interface, etc.

[0043] The 0.5S-class open-type electromagnetic current transformer contained in the complete set of equipment has the phase error consistency technical indicator characteristics. Specifically, the 0.5S-class open-type electromagnetic current transformer contained in the high-voltage slave of the complete set of equipment and the 0.5S-class open-type electromagnetic current transformer contained in the low-voltage slave have the phase error consistency technical indicator, and the phase error consistency technical indicator is ≤30 points.

[0044] The communication sub-device in this embodiment includes a first synchronous RF module, a second synchronous RF module and a third synchronous RF module; the third synchronous RF module is respectively connected to the first synchronous RF module and the second synchronous RF module; the first synchronous RF module, the second synchronous RF module and the third synchronous RF module are respectively built into the high-voltage detection sub-device 1, the low-voltage detection sub-device 3 and the computing sub-device 4.

[0045] In order to express the wireless synchronous current acquisition method conveniently and clearly, the abbreviations are as follows:

[0046] The synchronous radio frequency module (third synchronous radio frequency module) built into the control host is referred to as the control host radio frequency module;

[0047] The synchronous radio frequency module (first synchronous radio frequency module) built into the high-voltage slave is referred to as the high-voltage slave radio frequency module;

[0048] The synchronous RF module (second synchronous RF module) built into the low-voltage slave is referred to as the low-voltage slave RF module;

[0049] High voltage slave RF modules and low voltage slave RF modules are collectively referred to as slave RF modules.

[0050] The single-chip microcomputer module built into the high-voltage slave and the single-chip microcomputer module built into the low-voltage slave are collectively referred to as slave single-chip microcomputer modules.

[0051] The implementation process of wireless synchronous current acquisition is as follows:

[0052] 1) Control the host to start synchronous measurement

[0053] The host RF module is controlled to send a "start synchronous measurement" command. The high-voltage slave RF module and the low-voltage slave RF module receive the "start synchronous measurement" respectively, and the slave MCU module starts to execute the waiting synchronous measurement operation.

[0054] 2) Periodic timing synchronization measurement of slaves

[0055] The host RF module is controlled to periodically send the "synchronous acquisition pulse" command. After the high-voltage slave RF module and the low-voltage slave RF module receive the "synchronous acquisition pulse" respectively, the slave microcontroller module starts to execute the AD sampling process.

[0056] The slave MCU module performs AD sampling process as follows:

[0057] The slave RF module sends a pulse signal to the slave MCU module. After the slave MCU module receives the pulse signal through an interrupt operation, it uses this time base to control the start of the high-precision AD sampling module through the slave MCU module to perform continuous sampling at the specified frequency. After the sampling is completed, the slave MCU module quickly calculates the relevant current parameters.

[0058] The slave single-chip computer module sequentially sends the calculated related current parameters back to the host radio frequency module through the slave radio frequency module within the timing interval, and controls the host to complete the synchronous measurement of this periodic timing interval.

[0059] The relevant current parameters can be the original specified frequency continuous sampling waveform synchronously collected by the slave microcontroller module, or the fundamental effective value and phase data calculated by the slave microcontroller module through the Fourier algorithm, and can also be other parameters obtained by the slave microcontroller module through various extended calculations according to user needs.

[0060] The control host periodically controls the above process 2), the slave RF module periodically and synchronously performs synchronous measurement, and then the control host human-machine interface module refreshes the data display.

[0061] The control host periodically controls the above process 2). If the slave RF module fails to synchronize (i.e. the slave RF module does not receive the "synchronous acquisition pulse" sent by the control host RF module), the slave MCU module cannot perform AD sampling, and the control host cannot refresh the data display in the control host within the periodic timing interval and waits for the next periodic timing interval to perform synchronous measurement. Therefore, synchronous measurement has strong application robustness.

[0062] 3) Control host display refresh data

[0063] The control host receives the relevant current parameters sent by the high-voltage slave and the low-voltage slave, and various algorithms implanted in the control host microcontroller module complete various required calculations, and then display the corresponding calculation parameters required by the user on the control host human-machine interface.

[0064] The calculation parameters required by the corresponding users are typically various parameters such as the high-voltage current to low-voltage current transformation ratio, the high-voltage current to low-voltage current phase difference, etc.

[0065] The control host can also expand other advanced functions based on synchronous current data collection.

[0066] 4) Control the host to stop synchronous measurement

[0067] The control host sends a "stop synchronous measurement" command, and the slave stops synchronous acquisition after receiving it.

[0068] The portable multi-channel wireless synchronous current acquisition device comprises a wireless high-voltage current open-end clamp meter, a wireless low-voltage current open-end clamp meter and a wireless palm host.

[0069] Wireless high-voltage current open clamp meter, used to complete live measurement of high-voltage primary current.

[0070] Wireless low voltage current open clamp meter, used to complete live measurement of low voltage secondary current.

[0071] Wireless palm host, used to display data after synchronous current collection.

[0072] The utility model provides a method for synchronously measuring the primary and secondary currents of all current transformers installed in a field combined transformer (three-phase four-wire system), comprising the following steps:

[0073] 1) On the high-voltage A / B / C lines on the primary side of the combined transformer, three wireless high-voltage current open clamp meters are installed in sequence through insulating operating rods to obtain the high-voltage A / B / C primary currents.

[0074] 2) Install three wireless low-voltage current open clamp meters on the secondary current a / b / c low-voltage lines of the secondary metering box of the combined transformer in sequence to obtain the low-voltage a / b / c secondary currents.

[0075] 3) Operate the wireless palm host to perform the synchronous measurement function. The host LCD will refresh the display of the transformation ratio, phase difference and other information of the high-voltage A / B / C primary current and the low-voltage a / b / c secondary current at regular intervals, and refresh the data every second to perform three-phase synchronous measurement.

[0076] The wireless high-voltage current open clamp meter (high-voltage extension) includes a 0.5S-level open-type electromagnetic current transformer, a synchronous radio frequency module, a high-precision AD sampling module, a single-chip microcomputer module, and a power module.

[0077] The 0.5S class open-type electromagnetic current transformer, 10kV distribution network primary current, is typically designed as a 600A / 1A electromagnetic current transformer. The core is made of high magnetic permeability materials such as microcrystalline or Permalloy, the secondary load is 0.05Ω, and the accuracy level is 0.5S.

[0078] The synchronous RF module uses a low-power 433 small wireless module, typically using the SX1212 core chip, and is designed with a synchronization function. When wireless data is received, the synchronization pin is not set low. When the synchronization code is received, the synchronization pin is set low and kept high for 5mS to achieve the function of synchronous output. The time difference between multiple receiving ends receiving the synchronization code and setting the synchronization pin low is less than 10uS, that is, the synchronization time is ≤10uS.

[0079] High-precision AD sampling module, built-in relay control module for automatic range switching, 2 control gears, total range: 1A ~ 600A, range 1: 25A ~ 600A, range 2: 1A ~ 25A.

[0080] The single-chip microcomputer module controls the gear logic and first samples the current through range 1. If the measured value is within the range of range 2, the relay is controlled to shift gears. In the next measurement, range 2 is selected for current sampling, and the gear shift operation is automatically performed, providing a more suitable analog signal for processing for the 16-bit AD conversion system in the high-precision AD sampling module, thereby eliminating the problem of large lower limit measurement error during single-range AD conversion.

[0081] High-precision AD sampling module, built-in 16-bit AD conversion system, typically using ADS8866, ADS8866 is a 16-bit, 100kSPS single-ended input analog-to-digital converter.

[0082] The single-chip microcomputer module is composed of a 16-bit low-power single-chip microcomputer, and the typical single-chip microcomputer module is MSP430FR5969.

[0083] The power module adopts a mature integrated battery charging and discharging module to complete the battery charging and discharging functions and provide power to the above systems.

[0084] The wireless low-voltage current open clamp meter (low-voltage extension) includes a 0.5S-level open-type electromagnetic current transformer, a synchronous radio frequency module, a high-precision AD sampling module, a single-chip microcomputer module, and a power module.

[0085] The 0.5S class open type electromagnetic current transformer is typically designed as a 5A / 5mA micro current transformer according to the secondary current of the current transformer of 5A. The core is made of high magnetic permeability materials such as microcrystalline or Permalloy, the secondary load is 0.05Ω, and the accuracy level is 0.5S.

[0086] The synchronous RF module is exactly the same as the synchronous RF module built into the high-voltage extension.

[0087] High-precision AD sampling module, built-in relay control module for automatic range switching, the microcontroller module controls the gear to 2 gears, total range: 0.05A ~ 6A, range 1: 0.5A ~ 6A, range 2: 0.05A ~ 0.5A.

[0088] The other built-in functional modules of the low-voltage extension are the same as those of the high-voltage extension, and will not be described here.

[0089] The control host includes a synchronous radio frequency module, a single-chip computer module, a human-machine interface module, and a power supply module.

[0090] The synchronous radio frequency module, single-chip microcomputer module and power supply module contained therein are completely consistent with the high-voltage extension and low-voltage extension.

[0091] The control host is equipped with a human-machine interface module. The typical LCD is a 320×240 TFT screen, which can fully display all 6 channels of data on a single screen (no need to flip the screen to view), making it convenient for users to view the measurement data on site. The fool-style up, down, left, right, confirm, cancel and other navigation buttons are arranged to facilitate user parameter setting and operation. The specific implementation method of wireless synchronous current acquisition is as follows:

[0092] like Figure 3 As shown, the control host execution process is as follows:

[0093] 1) Start synchronous measurement

[0094] The host RF module is controlled to send a "start synchronous measurement" command. The high-voltage slave RF module and the low-voltage slave RF module receive the "start synchronous measurement" respectively, and the slave MCU module starts to execute the waiting synchronous measurement operation.

[0095] 2) The "synchronous acquisition pulse" is sent every second at the timing period interval

[0096] The host RF module is controlled to periodically send a "synchronous acquisition pulse" command to the high-voltage slave RF module and the low-voltage slave RF module every second.

[0097] 3) Receive slave calculation parameters

[0098] The control host receives the calculated related current parameters sent back by the high-voltage slave RF module and the low-voltage slave RF module within the timing cycle interval.

[0099] 4) Stop synchronous measurement

[0100] If you need to stop the synchronous measurement, send a "stop synchronous measurement" command, and the high-voltage slave RF module and the low-voltage slave RF module will receive the "stop synchronous measurement" command respectively and will no longer perform the synchronous acquisition task.

[0101] 5) Display calculation parameters

[0102] The control host receives the calculated relevant current parameters each time during the process 3) and refreshes the display through the control host human-machine interface module (TFT liquid crystal).

[0103] like Figure 4 As shown, the execution process of the high-voltage slave and the low-voltage slave is as follows:

[0104] 1) Receive the control host to start synchronous measurement

[0105] The high-voltage slave RF module and the low-voltage slave RF module receive the "start synchronous measurement" instruction respectively, and the slave microcontroller module starts to execute the waiting synchronous measurement operation.

[0106] 2) Receive the synchronous acquisition pulse from the control host

[0107] After receiving the "synchronous acquisition pulse", the high-voltage slave RF module and the low-voltage slave RF module notify the single-chip microcomputer module through an interrupt, and the single-chip microcomputer module controls the high-precision AD sampling module to start executing the AD sampling process.

[0108] 3) Perform AD sampling and calculate parameters

[0109] After the slave single-chip microcomputer module receives the "synchronous acquisition pulse" through the interrupt operation, it uses this time reference to control the high-precision AD sampling module to perform continuous sampling of 4 cycles in this embodiment through the slave single-chip microcomputer module, and the slave single-chip microcomputer module quickly calculates the relevant current parameters. The Fourier algorithm is used to calculate the fundamental amplitude and phase using the complete 1-cycle data starting from the 0.5 cycle.

[0110] 4) Send to control host for calculation parameters

[0111] The slave MCU module sends the calculated related current parameters back to the host RF module through the slave RF module in a timed interval, and then returns to the 2) process again to wait for "receiving the control host synchronous acquisition pulse", and repeats this process.

[0112] 5) Receive the control host to stop synchronous measurement

[0113] After receiving the "stop synchronous measurement" command from the control host, the slave ends the synchronous sampling process.

[0114] The beneficial effects of the utility model are as follows:

[0115] 1) The complete set of the utility model is easy to operate, and wireless communication is adopted between the high-voltage slave, the low-voltage slave and the control host, which is convenient for on-site testing.

[0116] 2) The complete set of the utility model has the function of synchronous sampling of high-voltage current and low-voltage current, which fills the gap that the conventional transformer ratio tester only has the ratio test (i.e., numerical parameter test), and adds the transformer phase difference test function. The complete set of the device has a 0.5-level accuracy level, which provides a convenient means of analysis and judgment for the power supply company's marketing and metering specialists to determine whether the current transformer has a phase error on site.

[0117] 3) The complete set of the utility model has a multi-channel testing function, filling the gap that conventional transformer ratio testers only have high and low voltage 2-channel testing. The complete set of the equipment realizes one-time wiring measurement and three-phase synchronous measurement of all test channels on site, which greatly improves work efficiency. For actual distribution station areas, multiple current transformers installed in the combination transformer require accurate ratio relationship and phase relationship of high voltage (primary side) and low voltage (secondary side) at one time to provide accurate data.

[0118] 4) The wireless synchronous current acquisition implementation method of the utility model requires simple hardware and algorithm software, has high fault tolerance and strong robustness, will not cause data errors due to a certain synchronization failure, and has a very wide range of application and promotion capabilities.

[0119] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0120] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. At the same time, for those skilled in the art, according to the ideas of the utility model, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the utility model.

Claims

1. A multi-channel wireless synchronous current acquisition device, comprising a high-voltage detection sub-device for high-voltage side current acquisition, a low-voltage detection sub-device for low-voltage side current acquisition, and a calculation sub-device for calculating and displaying a transformer ratio and a phase value, wherein the calculation sub-device is connected to the high-voltage detection sub-device and the low-voltage detection sub-device, respectively, and characterized in that: The high-voltage detection sub-device, the low-voltage detection sub-device and the computing sub-device are all equipped with a built-in communication sub-device for wireless radio frequency communication, and the communication sub-device is used to provide a wireless channel for two-way data interaction between the computing sub-device and the high-voltage detection sub-device and the low-voltage detection sub-device.

2. The multi-channel wireless synchronous current acquisition device according to claim 1, characterized in that: The communication sub-device includes a first synchronous RF module, a second synchronous RF module and a third synchronous RF module; the third synchronous RF module is respectively connected to the first synchronous RF module and the second synchronous RF module; the first synchronous RF module, the second synchronous RF module and the third synchronous RF module are respectively built into the high-voltage detection sub-device, the low-voltage detection sub-device and the calculation sub-device.

3. The multi-channel wireless synchronous current acquisition device according to claim 1, characterized in that: The high-voltage detection sub-device includes: a first current transformer, a first AD sampling module and a first single-chip microcomputer module connected in sequence; the first current transformer is arranged on the high-voltage line to be tested; the first single-chip microcomputer module is also connected to the communication sub-device in the high-voltage detection sub-device, and the first single-chip microcomputer module is configured to control the time difference of the received signals between the communication sub-device in the high-voltage detection sub-device and other communication sub-devices, and control the sampling start time of the first AD sampling module.

4. The multi-channel wireless synchronous current acquisition device according to any one of claims 1 to 3, characterized in that: The low-voltage detection sub-device includes: a second current transformer, a second AD sampling module and a second single-chip microcomputer module connected in sequence; the second current transformer is arranged on the low-voltage line to be tested; the second single-chip microcomputer module is also connected to the communication sub-device in the low-voltage detection sub-device, and the second single-chip microcomputer module is configured to control the time difference of the received signals between the communication sub-device in the low-voltage detection sub-device and other communication sub-devices, and control the sampling start time of the second AD sampling module.

5. The multi-channel wireless synchronous current acquisition device according to any one of claims 1 to 3, characterized in that: The computing sub-device includes: a third single-chip microcomputer module and a human-machine interface module that are interconnected; the third single-chip microcomputer module is also connected to the communication sub-device in the computing sub-device, and the third single-chip microcomputer module is configured to control the communication sub-device in the computing sub-device to send and receive data to other communication sub-devices, and determine the transformer ratio and phase value based on the received data; the human-machine interface module is configured to display the working data and calculation results of the third single-chip microcomputer module, and obtain the user's usage instructions and provide corresponding visual interface prompts.

6. The multi-channel wireless synchronous current acquisition device according to claim 5, characterized in that: The third single-chip microcomputer module controls the communication sub-device in the computing sub-device to send data to other communication sub-devices in a synchronous manner.

7. The multi-channel wireless synchronous current acquisition device according to any one of claims 1, 2, 3 and 6, characterized in that: The communication sub-devices in the high voltage detection sub-device and the low voltage detection sub-device receive data in a synchronous receiving manner.

8. The multi-channel wireless synchronous current acquisition device according to claim 3, characterized in that: The time difference of receiving signal is ≤10uS.

9. The multi-channel wireless synchronous current acquisition device according to any one of claims 1, 2, 3 and 8, characterized in that: There are multiple high voltage detection sub-devices and / or low voltage detection sub-devices.

10. The multi-channel wireless synchronous current acquisition device according to any one of claims 1, 2, 3 and 8, characterized in that: The high-voltage detection sub-device, the low-voltage detection sub-device and the calculation sub-device are all equipped with a power supply sub-device for supplying power.

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