Three-phase electric energy quality detection equipment

Abstract

The utility model discloses three-phase electric energy quality detection equipment, which comprises a plurality of current transformers, a plurality of voltage transformers, a three-phase electric energy metering chip, a central control chip, a communication circuit, an output signal conversion circuit and a master station CPU (Central Processing Unit), the current transformer and the voltage transformer are used for collecting data of a main power supply of the tested equipment; the three-phase electric energy metering chip is used for metering the sampling data to obtain each electric energy quality parameter and a detection result; the central control chip is in communication connection with the three-phase electric energy metering chip; the central control chip is in communication connection with the master station CPU through the communication circuit, or the master station CPU is in communication connection with a third-party master station; and the central control chip is also in communication connection with the output signal conversion circuit, the output signal conversion circuit is used for converting an output signal of the central control chip into a signal which can be accepted by the control equipment when the detection result is that a fault occurs, and the control equipment is used for disconnecting a main power supply of the detected equipment. The device supports various communication protocols, has an anti-control function, and can detect the quality of a power supply.

Description

Technical Field

[0001] The utility model specifically relates to a three-phase power quality detection device. Background Art

[0002] In industrial automation sites or machining industries, existing three-phase power quality testing is concentrated at the main input of all equipment and the factory's main distribution cabinet. However, there are relatively few power quality measurement and monitoring products for a single device or a single production line, and they are expensive.

[0003] However, the demand for power measurement data in digital factories is increasing. At the same time, the complexity of industrial field environments and the wide variety of communication interfaces between devices have increased the difficulty of interconnecting various devices, which is mainly reflected in the following aspects:

[0004] First, the power detection equipment has many types of hardware communication interfaces, which is not conducive to interconnection with other devices.

[0005] Second, electrical energy equipment can only detect the power usage status of the equipment, and cannot cut off the circuit or remotely shut down the equipment when there is a fault such as a power outage. Utility Model Content

[0006] In order to solve the above technical problems, the utility model proposes a three-phase power quality detection device.

[0007] In order to achieve the above object, the technical solution of the utility model is as follows:

[0008] The utility model discloses a three-phase power quality detection device, comprising: a plurality of current transformers, a plurality of voltage transformers, a three-phase power metering chip, a central control chip, a communication circuit, an output signal conversion circuit and a master station CPU;

[0009] The current transformer is used to collect the current of each phase of the total power supply of the device under test;

[0010] The voltage transformer is used to collect the voltage of each phase of the total power supply of the device under test;

[0011] The current sampling pin of the three-phase electric energy metering chip is electrically connected to the current transformer, and its voltage sampling pin is electrically connected to the voltage transformer. The three-phase electric energy metering chip is used to measure the sampled data to obtain various power quality parameters and test results;

[0012] The central control chip is connected to the three-phase power metering chip for communication. The central control chip receives the collected data, various power quality parameters and test results sent by the three-phase power metering chip.

[0013] The central control chip communicates with the master station CPU, or the master station CPU and the third-party master station through a communication circuit. The communication circuit is used to realize data interaction between the central control chip and the master station CPU and the third-party master station;

[0014] The central control chip is also connected to the output signal conversion circuit for communication. When the detection result is a fault, the output signal of the central control chip is converted into a signal acceptable to the control device, and the control device is used to disconnect the main power supply of the device under test.

[0015] On the basis of the above technical solution, the following improvements can be made:

[0016] As a preferred solution, the three-phase electric energy metering chip includes: a current sampling circuit, a voltage sampling circuit and several data registers;

[0017] The current sampling circuit is used to calculate the collected current of each phase;

[0018] The voltage sampling circuit is used to calculate the collected voltages of each phase;

[0019] The data register is used to store various power quality parameters and test results.

[0020] As a preferred solution, the three-phase power quality detection device further includes: a clock circuit;

[0021] The clock circuit is connected to the central control chip for communication, and is used to provide clock services.

[0022] As a preferred solution, the three-phase power quality detection device further includes: an Internet of Things circuit;

[0023] The IoT circuit is connected to the main station CPU for communication, and is used to implement data interaction between the main station CPU and the client cloud platform.

[0024] As a preferred solution, the three-phase power quality detection device further includes: a Bluetooth circuit;

[0025] The Bluetooth circuit is connected to the master station CPU for communication, and is used to implement data interaction between the master station CPU and the mobile device.

[0026] As a preferred solution, the master station CPU is integrated with an RJ45 interface, and the RJ45 interface is connected to the client switch or network management equipment through a wired network.

[0027] As a preferred solution, the control device further includes: an alarm device, which is used to issue an alarm reminder when the detection result is a fault.

[0028] As a preferred solution, one side of each current transformer is installed on the L1, L2, L3 input cables of the main power supply of the device under test, and its secondary side leads are electrically connected to the corresponding current sampling pins of the three-phase power metering chip.

[0029] As a preferred scheme, when the total power supply of the measured device is three-phase three-wire system, one end of each voltage transformer is electrically connected with the input cable of L1, L2 and L3 of the total power supply of the measured device, and the other end is electrically connected with the corresponding voltage sampling pin of the three-phase electric energy metering chip.

[0030] As a preferred scheme, when the total power supply of the measured device is three-phase four-wire system or three-phase five-wire system, the center line N of the total power supply of the measured device is electrically connected with the UN end pin of the three-phase electric energy metering chip.

[0031] The three-phase electric energy quality detection device has the following beneficial effects:

[0032] Firstly, the utility model has multiple interfaces and supports multiple communication protocols.

[0033] Secondly, the utility model is low in cost, convenient and safe and reliable for electric energy detection.

[0034] Thirdly, the utility model has a reverse control function, can timely disconnect the total power supply of the measured device when the detection result is a fault, and is high in safety factor. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the premise of the drawings.

[0036] Figure 1 It is a structure schematic view of the three-phase electric energy quality detection device provided by the embodiments of the utility model.

[0037] Figure 2 It is a structure schematic view of the three-phase electric energy quality detection device provided by the embodiments of the utility model.

[0038] Figure 3 It is a schematic view of the three-phase electric energy metering chip and other circuit connection provided by the embodiments of the utility model.

[0039] Figure 4 It is a schematic view of the Internet of Things circuit communication provided by the embodiments of the utility model.

[0040] Figure 5 It is a schematic view of the third party master station communication provided by the embodiments of the utility model.

[0041] Figure 6 It is a schematic view of the Bluetooth communication provided by the embodiments of the utility model.

[0042] Figure 7 A schematic diagram of Ethernet communication provided by an embodiment of the present utility model.

[0043] Among them: 1-three-phase electric energy metering chip, 11-current sampling circuit, 12-voltage sampling circuit, 13-data register, 2-central control chip, 3-communication circuit, 4-output signal conversion circuit, 5-master station CPU, 6-clock circuit, 7-Internet of Things circuit, 8-Bluetooth circuit. DETAILED DESCRIPTION

[0044] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0046] The expression “including” an element is an “open” expression, which simply means that corresponding components exist and should not be interpreted as excluding additional components.

[0047] In order to achieve the purpose of the present invention, in some embodiments of the three-phase power quality detection device, as Figure 1 、 Figure 3 、 Figure 5 As shown, the three-phase power quality detection equipment includes: 3 current transformers (such as open-type current transformers with a transformation ratio of 1000:1), 3 voltage transformers (such as 2mA current-type voltage transformers), a three-phase power metering chip 1, a central control chip 2 (such as an ARM chip, an MCU chip, etc.), a communication circuit 3 (such as an external RS485 interface circuit), an output signal conversion circuit 4, and a master station CPU 5 (such as a Linux system board).

[0048] The current transformer is used to collect the current of each phase of the total power supply of the device under test.

[0049] The voltage transformer is used to collect the voltage of each phase of the total power supply of the device under test.

[0050] The current sampling pin of the three-phase electric energy metering chip 1 is electrically connected to the current transformer, and the voltage sampling pin thereof is electrically connected to the voltage transformer. The three-phase electric energy metering chip 1 is used to measure the sampled data to obtain various power quality parameters and test results.

[0051] The above-mentioned power quality parameters include: effective value of each phase voltage (UA, UB, UC), effective value of phase current (IA, IB, IC), frequency (Freq), phase active power (PA, PB, PC), phase reactive power (QA, QB, QC), phase power factor (PfA, PfB, PfC), total phase active power (PT), total phase reactive power (QT), total phase power factor (PfTA), phase active energy consumption (EPA, EPB, EPC), total active power consumption (EPT), etc.

[0052] The three-phase power metering chip 1 is connected to the central control chip 2 via the SPI interface, and the central control chip 2 receives the collected data, various power quality parameters and test results sent by the three-phase power metering chip 1.

[0053] The central control chip 2 is connected to the master station CPU 5 and the third-party master station via the communication circuit 3. The communication circuit 3 is used to implement data exchange between the central control chip 2, the master station CPU 5, and the third-party master station based on the Modbus software protocol. The utility model can transmit power quality data through the third-party master station.

[0054] The central control chip 2 is also connected to the output signal conversion circuit 4 for communication. The output signal conversion circuit 4 is used to convert the output signal of the central control chip 2 into a signal that can be accepted by the control device when the detection result is a fault. The control device is used to disconnect the main power supply of the device under test. Furthermore, the central control chip 2 is integrated with two digital interfaces. When the detection result is a fault (such as a three-phase power supply phase failure, etc.), the GPIO output of the central control chip 2 is triggered to output a high level, and the output signal conversion circuit 4 converts the GPIO signal into a 24V switch signal. By using this switch signal to connect to the PLC or the shunt release (i.e., the control device) of the main power switch, the upper computer can receive a PLC fault alarm or directly disconnect the main input power when the main power fails. Furthermore, the output end of the output signal conversion circuit 4 is electrically connected to the voltage stabilizing circuit and the amplifier circuit in sequence, and is used to stabilize and amplify the switch signal.

[0055] It is worth noting that one side of each of the above-mentioned current transformers is installed on the L1, L2, and L3 input cables of the main power supply of the equipment under test, and its secondary side leads are electrically connected to the corresponding current sampling pins of the three-phase electric energy metering chip 1 (such as: IA*, IA, IB*, IB, IC*, and the interface end of IC).

[0056] When the total power supply of the device under test is a three-phase three-wire system, one end of each voltage transformer is electrically connected to the input cables L1, L2, and L3 of the total power supply of the device under test, and the other end is electrically connected to the corresponding voltage sampling pin of the three-phase electric energy metering chip 1 (such as the interface end of UA, UB, and UC).

[0057] like Figure 2As shown, when the total power supply of the device under test is a three-phase four-wire system or a three-phase five-wire system, the center line N of the total power supply of the device under test is electrically connected to the UN terminal pin of the three-phase electric energy metering chip 1.

[0058] The utility model is a three-phase power quality detection device which adopts a variety of different communication methods, and has a device reverse control function and a remote shutdown function in the event of a power failure in an automated on-site power supply.

[0059] This new device features high precision, a small size, easy installation, and high safety and reliability. Current measurement uses an external current transformer, while voltage measurement uses a built-in current-type voltage transformer, achieving full isolation in both measurements. Therefore, there is no risk of the device under test becoming inoperative due to a malfunction of this device.

[0060] In order to further optimize the implementation effect of the present invention, in some other embodiments, the remaining characteristic technologies are the same, except that the three-phase electric energy metering chip 1 includes: a current sampling circuit 11, a voltage sampling circuit 12 and a plurality of data registers 13;

[0061] The current sampling circuit 11 is used to calculate the collected current of each phase;

[0062] The voltage sampling circuit 12 is used to calculate the collected voltages of each phase;

[0063] The data register 13 is used to store various power quality parameters and detection results.

[0064] The current sampling circuit 11 and the voltage sampling circuit 12 are differential sampling circuits, and the current sampling circuit 11 and the voltage sampling circuit 12 are isolated from each other to ensure safe isolation between the electrical equipment and the sampling equipment.

[0065] This device uses an independent power supply with a wide voltage range input power supply: DC24V±20%, 1A. Once powered on, the three-phase power quality tester begins operating, monitoring the device's power usage in real time. The three-phase power metering chip 1 calculates and stores this real-time power data in corresponding data registers 13 for access via the SPI interface of the central control chip 2.

[0066] In order to further optimize the implementation effect of the present utility model, in some other implementations, the remaining characteristic technologies are the same, except that the three-phase power quality detection device further includes: a clock circuit 6;

[0067] The clock circuit 6 is connected to the central control chip 2 via I2C communication, and the clock circuit 6 is used to provide clock services.

[0068] The utility model integrates RTC real time clock circuit 6, can understand each item electric energy generation of equipment in real time state and the power quality and other parameters of equipment of some time period in the past.

[0069] In some embodiments, the utility model also integrates traditional electric energy pulse output, and this function can be used for directly connecting to standard electric energy meter to carry out error comparison and check.

[0070] In order to further optimize the implementation effect of the utility model, in some other embodiments, the remaining characteristic technologies are same, and the difference is that, as shown in Figure 4 The three-phase electric energy quality detection equipment also includes: internet of things circuit 7.

[0071] The internet of things circuit 7 is in communication connection with the main station CPU 5, and the internet of things circuit 7 is used to realize the data interaction between the main station CPU 5 and the client cloud platform.

[0072] The main station CPU 5 sends data to CAT.1 wireless internet of things circuit 7 through USART serial port protocol, and the CAT.1 wireless internet of things circuit 7 sends electric energy data to the client cloud platform through MQTT protocol by using external antenna, for customer use.

[0073] Further, the CAT.1 wireless internet of things circuit 7 has positioning function.

[0074] In order to further optimize the implementation effect of the utility model, in some other embodiments, the remaining characteristic technologies are same, and the difference is that, as shown in Figure 6 The three-phase electric energy quality detection equipment also includes: bluetooth circuit 8.

[0075] The bluetooth circuit 8 is in communication connection with the main station CPU 5, and the bluetooth circuit 8 is used to realize the data interaction between the main station CPU 5 and mobile device.

[0076] The utility model integrates bluetooth circuit 8, and it is used for data transmission and configuration between mobile device, and mobile device can access equipment configuration interface through applet or APP, and mobile device can complete data transmission with three-phase electric energy through BLE5.0 bluetooth protocol after configuration.

[0077] When fault occurs, mobile device can be used to remotely shut down detection equipment.

[0078] In order to further optimize the implementation effect of the utility model, in some other embodiments, the remaining characteristic technologies are same, and the difference is that, as shown inFigure 7 As shown, the master station CPU5 is integrated with an RJ45 interface, and the RJ45 interface is connected to the client switch or network management equipment through a wired network.

[0079] The master station CPU5 integrates an Ethernet interface, through which the power data can be sent to the client server. The client displays the received power quality data on the digital signage in the workshop through a display.

[0080] To further optimize the implementation of the present invention, in other embodiments, the remaining characteristic technologies are the same, except that the control device further includes an alarm device for issuing an alarm when the detection result indicates a fault. The alarm device may be, but is not limited to, a buzzer, a voice broadcast device, an LED light, and the like.

[0081] The electronic components such as chips and interfaces involved in this utility model are mounted on a PCB board, and the PCB board is encapsulated in a housing, and the housing can be

[0082] The three-phase power quality detection device of the utility model can be used in automated production lines, CNC machine tools and other machining industries, and has the following beneficial effects:

[0083] First, the utility model has multiple interfaces and supports multiple communication protocols, such as Modbus communication, Ethernet communication, Bluetooth protocol communication, and LTE CAT-14G wireless communication. The client can use any of these protocol interfaces to detect device power quality information.

[0084] Second, the utility model is low-cost, convenient for electric energy detection, and safe and reliable.

[0085] Third, the utility model has a reverse control function. When the detection result is a fault, the main power supply of the device under test can be disconnected in time, and the safety factor is high.

[0086] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0087] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements shall fall within the scope of the present invention to be protected. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. Three-phase power quality detection equipment, characterized in that, include: Several current transformers, several voltage transformers, three-phase power metering chips, central control chips, communication circuits, output signal conversion circuits, and master station CPU; The current transformer is used to collect the current of each phase of the total power supply of the device under test; The voltage transformer is used to collect the voltage of each phase of the total power supply of the device under test; The current sampling pin of the three-phase electric energy metering chip is electrically connected to the current transformer, and the voltage sampling pin thereof is electrically connected to the voltage transformer. The three-phase electric energy metering chip is used to measure the sampled data to obtain various power quality parameters and test results; The central control chip is in communication connection with the three-phase electric energy metering chip, and the central control chip receives the collected data, various power quality parameters and test results sent by the three-phase electric energy metering chip; The central control chip is connected to the master station CPU, or the master station CPU and the third-party master station through a communication circuit, and the communication circuit is used to realize data interaction between the central control chip and the master station CPU and the third-party master station; The central control chip is also in communication with an output signal conversion circuit, which is used to convert the output signal of the central control chip into a signal acceptable to the control device when the detection result is a fault, and the control device is used to disconnect the main power supply of the device under test.

2. The three-phase power quality detection device according to claim 1, characterized in that: The three-phase electric energy metering chip includes: a current sampling circuit, a voltage sampling circuit and several data registers; The current sampling circuit is used to calculate the collected current of each phase; The voltage sampling circuit is used to calculate the collected voltages of each phase; The data register is used to store various power quality parameters and detection results.

3. The three-phase power quality detection device according to claim 1, characterized in that: The three-phase power quality detection device further includes: a clock circuit; The clock circuit is in communication with the central control chip, and is used to provide clock services.

4. The three-phase power quality detection device according to claim 1, characterized in that: The three-phase power quality detection device further includes: an Internet of Things circuit; The Internet of Things circuit is communicatively connected to the main station CPU, and the Internet of Things circuit is used to realize data interaction between the main station CPU and the client cloud platform.

5. The three-phase power quality detection device according to claim 1, characterized in that: The three-phase power quality detection device further includes: a Bluetooth circuit; The Bluetooth circuit is in communication connection with the master station CPU, and is used to implement data interaction between the master station CPU and the mobile device.

6. The three-phase power quality detection device according to claim 1, characterized in that: The master station CPU is integrated with an RJ45 interface, and the RJ45 interface is connected to a client switch or a network management device through a wired network.

7. The three-phase power quality detection device according to claim 1, characterized in that: The control device further comprises: an alarm device, which is used to issue an alarm reminder when the detection result is a fault.

8. The three-phase power quality detection device according to any one of claims 1 to 7, characterized in that: One side of each current transformer is installed on the L1, L2, L3 input cables of the main power supply of the device under test, and its secondary side lead is electrically connected to the corresponding current sampling pin of the three-phase electric energy metering chip.

9. The three-phase power quality detection device according to any one of claims 1 to 7, characterized in that: When the total power supply of the device under test is a three-phase three-wire system, one end of each voltage transformer is electrically connected to the input cables L1, L2, and L3 of the total power supply of the device under test, and the other end is electrically connected to the corresponding voltage sampling pin of the three-phase power metering chip.

10. The three-phase power quality detection device according to claim 9, characterized in that: When the total power supply of the device under test is a three-phase four-wire system or a three-phase five-wire system, the center line N of the total power supply of the device under test is electrically connected to the UN terminal pin of the three-phase electric energy metering chip.

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