CN104240493B - The single-phase carrier module detection device of intelligent meter and detection method - Google Patents

Abstract

Intelligent form-phase carrier module detection equipment and detection method; it consists of a strong and weak current conversion unit, an isolation circuit for an AC power supply, a pure 220V AC power interface, an attenuation circuit, and a detection circuit; the detection circuit includes a strong current interface, a microcontroller, and a trigger The "start test trigger" button at the terminal, the relay control unit, the level detection unit, the communication interface of the copy controller, the weak current interface, the protection unit of the weak current interface, and the sound and light alarm circuit connected to the judgment output terminal of the microcontroller. The communication interface of the copy controller is connected with the pure 220V AC interface through the copy controller, the control terminal of the sound and light alarm circuit is connected with the output terminal of the microcontroller, and the "start test trigger" button is connected with the microcontroller. This equipment detects the newly installed modules, and the normal ones are brought to the site for new installation; those that are going to the site to replace the faulty modules are also tested to avoid bringing the faulty modules to the site.

Description

Intelligent single-phase carrier module detection equipment and detection method

technical field

The present invention relates to a method and a detection device for judging the failure of the intelligent meter phase carrier module mainly aiming at the power carrier fault in the communication of the smart meter phase carrier module that occurs during the installation and use of the smart meter of the electric power enterprise, and particularly relates to a Intelligent single-phase carrier module detection equipment and detection method.

Background technique

Low-voltage power line communication (Power Line Communication) refers to a technology that uses the existing low-voltage power line network as a transmission medium to realize data transmission and information exchange. The characteristics of low-voltage power line carrier communication, such as wide distribution of transmission channels, no need for additional construction, plug and play, and convenient movement, are very attractive to meet people's needs. At present, they are widely used to realize remote meter reading of smart meters.

The main function of the low-voltage power line intelligent carrier module is: the external control system transmits the data to be transmitted to the single-chip microcomputer P89LPC932 through the standard UART, I2C or SPI serial interface, and then modulates the data to the low-voltage power line through the microcontroller and the modulation circuit part At the same time, the data modulated on the low-voltage power line is partially demodulated through the demodulation circuit, and the data on the low-voltage power line is transmitted to the external control system for corresponding processing through the standard UART, I2C or SPI serial interface of the single-chip microcomputer P89LPC932.

As part of the construction of smart grid by power companies, the installation and use of smart meters has been carried out for more than a year, and is still being installed gradually. However, in the installation and promotion of smart meters, it is found that many smart meter signals cannot be returned normally. The current method is: go to the customer's site to use the copy controller and the handheld to cooperate, connect the copy controller to the power line, and collect the signal sent by the carrier module. , if the CC data is displayed in the handheld, the module can work normally, otherwise, it is judged that the module is faulty, and the module is replaced on site and tested again until the detected signal is correct. This method requires repeated round trips, and it is easy to bring faulty modules to the site.

Contents of the invention

The technical problem to be solved by the present invention is to provide an intelligent single-phase carrier module detection device and detection method, which can detect newly installed modules, and bring the normal ones to the site for new installation; those that need to go to the site to replace the faulty modules To test, avoid bringing a faulty module to the field.

The intelligent single-phase carrier module detection device involved in the present invention consists of a strong and weak current conversion unit, an isolation circuit for an AC power supply, a pure 220V AC power interface, an attenuation circuit, and a detection circuit; the detection circuit includes a strong current interface, a microcontroller, The "start test trigger" button at the trigger end, the relay control unit, the level detection unit, the communication interface of the copy controller, the weak current interface, the protection unit of the weak current interface, and the sound and light alarm circuit connected to the judgment output end of the microcontroller. The strong and weak current power conversion unit converts 220V AC mains power into DC power supply to the detection circuit, the isolation circuit converts the 220V AC mains power into pure 220V AC power and connects with the strong current interface through the attenuation circuit, and the weak current interface is protected by the weak current interface The unit is connected to the microcontroller, the level detection unit is connected between the weak current interface and the microcontroller and controlled by the relay control unit, and the relay control unit is also connected to the output terminal of the microcontroller, and the communication interface of the copy controller is connected via The copy controller is connected to the pure 220V AC interface, the control terminal of the sound and light alarm circuit is connected to the output terminal of the microcontroller, and the "start test trigger" button is connected to the microcontroller.

The detection method of the intelligent single-phase carrier module detection equipment involved in the present invention, the steps are as follows:

1. Press the "Start detection trigger" button to start detection, the microcontroller makes the relay control unit (MCU) pull in, the level detection unit sends a detection command to the weak current interface, detects the level, and sends the weak current signal to the MCU through the detection circuit Make a judgment; at the same time, command the communication interface (I/O) RS232 of the copy controller to send instructions to the copy controller to perform a meter reading test, and collect the high-voltage terminal information of the module through the strong current interface through the attenuation circuit and the pure 220V AC interface, and then communicate with the copy controller The interface is connected to the MCU for judgment, and the MCU sends a judgment command to the sound and light control unit; when a cycle ends, the relay is automatically cut off;

2. Weak current interface level detection

After the weak current interface receives the detection command, it extracts the 5V VDD-15 interface voltage of the carrier module; at the same time extracts the 12V VCC-19, 20 interface voltage, and judges the standard voltage "5V" by the MCU within the range of 5V±5%. Qualified, otherwise unqualified; judging that the standard voltage "12V" is 12V-15V is qualified, otherwise unqualified;

The EVENOUT level of the extracted carrier module interface is judged to be low by the MCU, otherwise it is unqualified; the SET level of the extracted carrier module 14 interface is judged to be low by the MCU, otherwise it is unqualified; the extracted carrier module 12 interface The SET level is judged to be low by the MCU and is qualified, otherwise it is unqualified;

3. Communication and power consumption detection

1) The MCU sends the meter reading command to the controller through the 232 serial port;

2) The MCU detects the transmission power consumption of the single-phase carrier module. If the power consumption is below 2.5w, it is qualified and proceeds to step 3). Otherwise, the process ends and the power consumption test fails;

3) The MCU judges whether the response frame is received, and analyzes it. If it is correct, the process ends, and the communication and power consumption tests pass, otherwise, proceed to step 4);

4) If the number of readings is ≧ twice, the process ends, and the communication and power consumption tests fail, otherwise go to step 1).

Beneficial effects of the present invention: compact structure, concise software flow, simple and convenient operation, and it is an excellent tool for testing the functions and performances of single-phase carrier modules; the simple and practical isolation network can isolate the power consumption environment of the tooling from the complex grid environment , which not only provides a pure power supply network for the tooling but also avoids the interference of the tooling to the outside world; through the attenuation network, the carrier signal of the master and slave nodes is attenuated (76dB) and then received and demodulated, simulating the attenuation of the carrier signal by the on-site power line, and the carrier High-efficiency MCU control, simultaneously simulating the upper computer and electric energy meter, not only simple in structure, but also low in cost; in place of relay control, fully considering the safety factors in the operation process; comprehensive weak current pin protection, effective Avoid hot-swapping operation and external interference damage to tooling chip and carrier module; real-time sound and light alarm circuit, display each test step and test result in time, easy to analyze problems; perfect process control, single-phase carrier A complete test is carried out during the field use of the module.

Description of drawings

Fig. 1 is a system diagram of an intelligent single-phase carrier module detection device;

Fig. 2 is the block diagram of intelligent single-phase carrier module detection equipment;

Figure 3 is a schematic diagram of the weak current interface of the intelligent single-phase carrier module detection device;

Fig. 4 is a schematic diagram of the carrier coupling interface of the carrier module.

Fig. 5 is the flow chart of intelligent single-phase carrier module detection method;

Fig. 6 is a flow chart of level detection in Fig. 5;

Fig. 7 is a flowchart of meter reading in Fig. 5 .

Detailed ways

As shown in Fig. 1 and Fig. 2, the intelligent single-phase carrier module detection equipment involved in the present invention is composed of a strong and weak current conversion unit, an isolation circuit of an AC power supply, a pure 220V AC interface, an attenuation circuit, and a detection circuit; the detection circuit Including strong current interface, microcontroller, "start test trigger" button on the trigger side, relay control unit, level detection unit, copy controller communication interface, weak current interface, weak current interface protection unit, and judgment connected to the microcontroller The output end is composed of sound and light alarm circuit, the strong and weak current power conversion unit converts 220V AC mains power into DC power supply for the detection circuit, and the isolation circuit converts 220V AC mains power into pure 220V AC power and connects with the strong current interface through the attenuation circuit , the weak current interface is connected to the microcontroller through the weak current interface protection unit, the level detection unit is connected between the weak current interface and the microcontroller and controlled by a relay control unit, and the relay control unit is also connected to the output terminal of the microcontroller , the communication interface of the copy controller is connected to the pure 220V AC interface through the copy controller, the control end of the sound and light alarm circuit is connected to the output end of the microcontroller, and the "start test trigger" button is connected to the microcontroller. In Figure 1, the detection circuit is inside the big black box, the weak current interface is a 12-pin interface, and the strong current interface is an 8-pin interface. The dotted line box is a single-phase carrier module, specifically the single-phase carrier module of the model "znmkjcy-9981" produced by Jinzhou Tuoxin Power Electronics Co., Ltd.

As shown in Figure 3, the weak current interface and corresponding relationship of the smart single-phase carrier module detection device are shown in Table 1.

As shown in FIG. 4 , the carrier coupling interface of the carrier module and the corresponding relationship are shown in Table 2. As shown in FIG. 3 , it takes about 8 seconds for each detection to be carried out by pressing the “start test trigger” button once.

The detection method of the intelligent single-phase carrier module detection device involved in the present invention, the general flow is as follows:

1) Start the test, press the "Start Test Trigger" button for each test, and it will take about 8 seconds.

2) The 12V relay pulls in, the fire wire relay pulls in, and the neutral wire relay pulls in.

3) Enter the level detection process, if successful, continue to step 4), if failed, go to step 5).

4) Enter the communication and power consumption detection process, if it is successful, enter step 5), if it fails, go to step 5).

5) Display the final result (success or failure indicator light is on) and the test unqualified item indicator light is on.

6) The 12V relay is disconnected, the live wire relay is disconnected, and the neutral wire relay is disconnected.

As shown in Figure 5, the specific steps are as follows:

1. Press the "Start detection trigger" button to start detection, the microcontroller makes the relay control unit (MCU) pull in, the level detection unit sends a detection command to the weak current interface, detects the level, and sends the weak current signal to the MCU through the detection circuit Make a judgment; at the same time, command the communication interface (I/O) RS232 of the copy controller to send instructions to the copy controller to perform a meter reading test, and collect the high-voltage terminal information of the module through the strong current interface through the attenuation circuit and the pure 220V AC interface, and then communicate with the copy controller Interface to the MCU for judgment, and the MCU sends a judgment command to the sound and light control unit. When a cycle is over, the relay is automatically cut off;

2. Weak current interface level detection

As shown in Figure 6, after the weak current interface receives the detection command, it extracts the 5V VDD-15 interface voltage of the carrier module; at the same time extracts the 12V VCC-19, 20 interface voltage, and judges the standard voltage "5V" at 5V through the MCU It is qualified within the range of ±5%, otherwise it is unqualified; judging that the standard voltage "12V" is 12V-15V is qualified, otherwise it is unqualified;

The EVENOUT level of the extracted carrier module interface is judged to be low by the MCU, otherwise it is unqualified; the SET level of the extracted carrier module 14 interface is judged to be low by the MCU, otherwise it is unqualified; the extracted carrier module 12 interface The SET level is judged to be low by the MCU and is qualified, otherwise it is unqualified;

3. Communication and power consumption detection

As shown in Figure 7, the steps are as follows:

1) The MCU sends the meter reading command to the controller through the 232 serial port;

2) The MCU detects the transmission power consumption of the single-phase carrier module. If the power consumption is below 2.5w, it is qualified and proceeds to step 3). Otherwise, the process ends and the power consumption test fails;

3) The MCU judges whether the response frame is received, and analyzes it. If it is correct, the process ends, and the communication and power consumption tests pass, otherwise, proceed to step 4);

4) If the number of readings is ≧ twice, the process ends, and the communication and power consumption tests fail, otherwise go to step 1).

The invention discloses a detection device and a detection method for detecting the carrier module of a smart meter. The method is to simulate the module detection device into a smart meter and a microcomputer, and attenuate (76dB) the carrier signal of a master-slave node through an attenuation network to receive Demodulation, simulating the attenuation of the carrier signal by the on-site power line, and testing the sending and receiving performance of the carrier. The module detection equipment is composed of isolation circuit, attenuation circuit, power supply circuit, level detection unit, microcontroller (MCU), etc., according to the changes of various parameters, automatic detection, including 12V voltage, carrier communication capability, module weak current pin level Status, static power consumption, dynamic power consumption, etc. For different types of errors, an audible alarm is provided and the fault point is indicated by an indicator light. This method transforms on-site problems into problems that can be solved in the office, greatly reduces the workload of low-voltage on-site inspectors in power supply companies, and can greatly reduce expenses while improving indicators. Provide technical support for the fault handling of smart meters in power supply enterprises.

The single-phase carrier module automatic detection device is easy to operate, just install the carrier module to the test equipment, and then press the retest button to start the test process. After the test is completed, there will be an audible alarm and an indicator light for the problematic carrier module. The test time for each carrier module is 8 seconds.

Table 1 Definition of weak current interface pins between automatic detection equipment and communication module

Table 2

Claims (2)

1. the single-phase carrier module detection device of intelligent meter, it is characterized in that：By the isolation of strong and weak electricity current conversion unit, AC power Circuit, pure 220V exchanges electrical interface, attenuator circuit, detection circuit；The detection circuit include forceful electric power interface, microcontroller, " starting test triggering " button, relay control unit, level detection unit, copy controller communication interface, the light current of triggering end connect Mouth, light current interface protection unit also have the sound light alarming circuit for the judging output terminal composition for being connected on microcontroller, the strong and weak electricity 220V electric mains transformation direct current is supplied electricity to detection circuit power supply by current conversion unit, and the isolation circuit is by 220V electric mains Become pure 220V alternating currents through attenuator circuit with forceful electric power interface to be connected, the light current interface through light current interface protection unit with it is micro- Controller is connected, and the level detection unit is connected between light current interface and microcontroller and is controlled by relay control unit, Relay control unit is also connected with microcontroller output, and the copy controller communication interface is exchanged through copy controller with pure 220V Electrical interface is connected, and the control terminal of the sound light alarming circuit is connected with the judgement output terminal of microcontroller, described " to start test to touch Hair " button is connected with microcontroller.

2. a kind of detection method of the single-phase carrier module detection device of intelligent meter, using intelligent form as described in claim 1 Phase carrier module detection device, it is characterized in that：Step is as follows：

1) press " starting test triggering " button to start to detect, microcontroller is attracted by relay control unit, level detection unit Sense command is sent to light current interface, is detected level, weak electric signal is sent to microcontroller by detection circuit carries out Judge；Order copy controller communication interface RS232 sends copy controller instruction and carries out meter reading test simultaneously, by forceful electric power interface through declining Powered down road, pure 220V exchange electrical interface acquisition module high pressure client informations arrive copy controller communication interface to microcontroller and are sentenced again Disconnected, microcontroller is sent to controlled by sound and light unit judges order；One Xun Huan is terminated, and relay is automatically cut off；

2) light current interface level detects

After light current interface is connected to sense command, the VDD interface voltages of carrier module 5V are extracted；Simultaneously to two of 12V VCC interface voltages extract, and are qualification in the range of 5V ± 5% by microcontroller criterion voltage " 5V ", otherwise unqualified； Criterion voltage " 12V " is qualification in 12V-15V, otherwise unqualified；Extract the EVENOUT of carrier module EVENOUT interfaces Level is judged as low level as qualification through microcontroller, otherwise unqualified；The SET level of carrier module SET interfaces is extracted through micro- Controller is judged as low level as qualification, otherwise unqualified；The SET level of extraction carrier module RST interfaces is sentenced through microcontroller It is qualified to break as low level, otherwise unqualified；

3), communication and consumption detection

A) microcontroller issues meter reading order to copy controller by RS232 serial ports；

B) sending power consumption of microcontroller detection single-phase carrier module, it is qualified if power consumption is in below 2.5w, continue step C), otherwise flow terminates, and power consumption test is unqualified；

C) microcontroller judges whether to receive acknowledgement frame, and is parsed, and flow terminates if correct, communication and power consumption test Otherwise qualification continues step d)；

D) copy reading Ci Shuo≤twice, then flow terminates, and communication and power consumption test are unqualified, otherwise go to step a).