Electric energy meter pulse interference protection method and equipment

Abstract

The invention relates to the field of pulse interference protection, and provides an electric energy meter pulse interference protection method and equipment. The method comprises processes respectively applied to the metering detection device and the metering display device. The metering detection device filters the electric signal through a multi-stage filter circuit to obtain a first filter signal, and sends the first filter signal to the metering display device after receiving the request; and the metering display device sends a request, receives a signal, judges whether the signal is valid data or not, requests again if the signal is invalid, and analyzes and displays if the signal is valid. And the equipment respectively corresponds to function settings of the metering detection device and the metering display device. Multistage filtering is combined with software processing, electromagnetic interference can be effectively removed, metering precision is guaranteed, the electric energy meter is prevented from being damaged, wrong reading is avoided, a data request strategy is reasonable, and system jamming cannot be caused under the condition that data are requested for multiple times.

Description

Technical Field

[0001] The present invention relates to pulse interference protection, and particularly to a method and device for protecting an electric energy meter from pulse interference. Background Art

[0002] At present, as a new type of electric energy metering device, the core functions of smart electric meters rely on high-precision sensors and wireless communication modules. However, electromagnetic interference has become one of the main factors threatening their reliability. Electronic components inside smart electric meters (such as integrated circuits, magnetosensitive elements, etc.) are vulnerable to interference in a strong electromagnetic field environment, resulting in metering errors, communication interruptions, and even data loss. Typical interference sources include electromagnetic radiation generated by high-power electrical appliances, radio equipment, and natural factors such as the Earth's magnetic field.

[0003] During operation, an electric energy meter may also be subject to electromagnetic interference (EMI) from the power grid or other external devices, such as changes in transient voltage and current caused by switch operations. These interferences may cause error signals to be generated in the internal circuit of the electric energy meter, thereby affecting the metering accuracy. In addition, high-energy pulse interference not only affects the metering accuracy but may also directly damage the sensitive electronic components of the electric energy meter, shortening the service life of the device.

[0004] Traditional protection measures often take a long time to identify and process interference signals. During this period, the electric energy meter may still be damaged or produce incorrect readings. Summary of the Invention

[0005] To solve the above problems, the present invention provides a method for protecting an electric energy meter from pulse interference, which is applied to a metering and detection device and includes the following steps: Filter an electrical signal through a filter circuit to obtain a first filtered signal; After receiving a signal request sent by a metering and display device, send the first filtered signal to the metering and display device, and the first filtered signal is used for the display circuit information of the metering and display device.

[0006] Preferably, the filter circuit adopts a multi-stage filter circuit. Existing filter circuits are usually single-stage filter circuits. However, in actual applications or EMC experiments, situations where the meter fails or the accuracy is inaccurate often occur. The multi-stage filter circuit designed here can effectively remove interference and protect the meter.

[0007] Based on the above solution, the multi-stage filter circuit includes a first-stage filter module and a second-stage filter module; Among them, the first-stage filter module includes a first input terminal and a second input terminal, and the first-stage filter module and the second-stage filter module are connected in series; The second-stage filter module includes a first output terminal and a second output terminal.

[0008] Based on the above solution, the first-stage filter module includes: A first resistor, with the first end of the first resistor being the first input terminal, the second end of the first resistor being connected to the first end of a first capacitor, and the second end of the first capacitor being connected to the first end of a second capacitor. Both the second end of the first capacitor and the first end of the second capacitor are grounded. A second resistor, with the first end of the second resistor being the second input terminal, and the second end of the second resistor being connected to the second end of the second capacitor. A third capacitor, with the first end of the third capacitor being connected to the second end of the first resistor and the first end of the first capacitor, and the second end of the third capacitor being connected to the second end of the second resistor and the second end of the second capacitor.

[0009] Based on the above solution, the secondary filtering module includes: A third resistor, with the first end of the third resistor being connected to the first end of a fourth capacitor, and the second end of the third resistor being connected to the first end of a fifth capacitor. The second end of the third resistor is the first output terminal. A fourth resistor, with the first end of the fourth resistor being connected to the second end of the fourth capacitor, and the second end of the fourth resistor being connected to the second end of the fifth capacitor. The second end of the fourth resistor is the second output terminal.

[0010] A second aspect of the present invention provides a method for protecting an electric energy meter from pulse interference, which is applied to a metering and display device and includes the following steps: Sending a signal request to the metering and detection device and receiving a first filtering signal sent by the metering and detection device. Judging whether the first filtering signal is valid data. If the first filtering signal is not valid data, resending the signal request to the metering and detection device and receiving the first filtering signal sent by the metering and detection device. If the first filtering signal is valid data, parsing the first filtering signal and displaying the parsed circuit information.

[0011] Based on the above solution, the valid data is a non-zero number.

[0012] Based on the above solution, the number of times of resending the signal request to the metering and detection device is N rounds, and M times are sent in each round, where both N and M are positive integers.

[0013] Preferably, 3 rounds are sent, 3 times are sent in each round, and a 1-second wait is performed before each round of sending. This ensures the accuracy of data acquisition, prevents inaccurate data caused by too few acquisition times and unnecessary resource occupation caused by too many acquisition times. Waiting for 1 second before each round of sending requests can also relieve the pressure on the system to process data.

[0014] A third aspect of the present invention provides an electric energy meter pulse interference protection device, which is applied to a metering and detection device and includes: A device for filtering an electrical signal through a filtering circuit to obtain a first filtering signal. A device that, after receiving a signal request sent by a metering display device, sends a first filtered signal to the metering display device, where the first filtered signal is used for the metering display device to display circuit information.

[0015] The fourth aspect of the present invention provides an electric energy meter pulse interference protection device, which is applied to a metering display device and includes: A device for sending a signal request to a metering detection device and receiving a first filtered signal sent by the metering detection device; A device for determining whether the first filtered signal is valid data. If the first filtered signal is not valid data, resending a signal request to the metering detection device and receiving the first filtered signal sent by the metering detection device. If the first filtered signal is valid data, parsing the first filtered signal and displaying the parsed circuit information.

[0016] The advantages of the present invention are as follows: 1. The present invention adopts a multi-stage filtering circuit, which can effectively remove electromagnetic interference, better protect the meter, reduce the influence of interference on generating false signals in the internal circuit of the electric energy meter, and ensure the metering accuracy; 2. The protection method of the present invention can process electrical signals more timely, avoiding or reducing the situation of damage to the electric energy meter and generating incorrect readings; 3. The present invention uses a dual filtering method of hardware circuit and software processing to prevent the situation that the filtering circuit temporarily fails in some extreme cases, resulting in inaccurate meter readings; 4. In the data request strategy of the metering display device of the present invention, the number of times of resending the signal request is set to 3 rounds, 3 times per round, and waiting for 1 second before each round of sending. This not only prevents inaccurate data caused by too few acquisition times, but also avoids unnecessary resource occupation caused by too many acquisition times, and can also relieve the pressure of the system to process data. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the overall flowchart of the present invention.

[0018] Figure 2 It is the schematic diagram of the multi-stage filtering circuit of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] To further explain the present invention, the following is described in conjunction with specific embodiments and the accompanying drawings of the specification.

[0020] As Figure 1 shown in the overall flowchart, the metering detection device filters the electrical signal through a filtering circuit to obtain a filtered signal after filtering; Wait to receive a signal request from the metering display device. After receiving the signal request, send the filtered signal to the metering display device; After receiving the filtered signal, the metering display device analyzes the filtered signal to obtain an analysis result, and determines whether this analysis result is the required valid data. If so, the analysis result is displayed. If not, the step of sending a signal request to the metering detection device is repeated until the required valid data is obtained.

[0021] In this embodiment, the metering detection device is specifically a metering chip, and the metering chip can acquire the electrical signal filtered by the filter circuit.

[0022] In this embodiment, the metering display device is specifically a data management chip, and the data management chip can analyze the electrical signal and convert the electrical signal into a digital signal.

[0023] In other embodiments, the data management chip is replaced with a single-chip microcomputer or a computer.

[0024] In this embodiment, the valid data is a non-zero number.

[0025] In other embodiments, the valid data is any number, which is used to record and trace the time when the meter fails.

[0026] In other embodiments, the valid data is any character, such as data markers like "ERROR".

[0027] Furthermore, the number of times the metering display device sends a signal request to the metering detection device is 3 rounds, and 3 times are sent in each round. In this case, only when all the received filtered signals are analyzed as invalid data, it is considered that the meter reading fails.

[0028] Furthermore, there is a 1-second interval between sending signal requests in each round to prevent system jamming caused by a large number of data requests in a short period of time.

[0029] Under this setting of this embodiment, after multiple experimental verifications, almost no meter reading failure occurs, and the normal operation of the system is not affected during data acquisition.

[0030] The above-mentioned filter circuit is specifically as Figure 2 shown, including a primary filter module and a secondary filter module. The primary filter module includes resistor R1, resistor R3, capacitor C1, capacitor C2, and capacitor C5, and the secondary filter module includes resistor R2, resistor R4, capacitor C3, and capacitor C4.

[0031] Further, in the first-stage filtering module, the first end of resistor R1 is the first input terminal IL-, the second end of resistor R1 is connected to the first end of capacitor C1, the second end of capacitor C1 is connected to the first end of capacitor C5, the second ends of both capacitor C1 and capacitor C5 are grounded, the second end of capacitor C5 is connected to the second end of resistor R3, the first end of resistor R3 is the second input terminal IL+, the first end of capacitor C2 is connected to the second end of resistor R1 and the first end of capacitor C1, and the second end of capacitor C2 is connected to the second end of resistor R3 and the second end of capacitor C5.

[0032] The above IL- and IL+ are only used to distinguish the input terminals and do not limit the positive and negative polarities.

[0033] Further, in the second-stage filtering module, the first end of resistor R2 is connected to the first end of capacitor C3, the second end of resistor R2 is connected to the first end of capacitor C4, the second end of resistor R2 is the first output terminal IL IN, the second end of capacitor C3 is connected to the first end of resistor R4, the second end of resistor R4 is connected to the second end of capacitor C4, and the second end of resistor R4 is the second output terminal IL IP.

[0034] In this embodiment, the connection method between the first-stage filtering module and the second-stage filtering module is: the first end of capacitor C2 is connected to the first end of capacitor C3, and the second end of capacitor C2 is connected to the second end of capacitor C3.

[0035] In other embodiments, the connection method between the first-stage filtering module and the second-stage filtering module is: the first end of capacitor C2 is connected to the second end of capacitor C3, and the second end of capacitor C2 is connected to the first end of capacitor C3.

[0036] Working principle: The pulse interference protection method provided by the present invention first filters the pulse interference through a hardware multi-stage filtering circuit, and then combines further filtering processing of software to achieve the purpose of anti-pulse interference. Through the filtering method combining hardware and software, a better filtering effect can be achieved. Before the device using this method is put into the actual use scenario, it needs to be subjected to quality inspection in the laboratory environment. The way to simulate pulse interference in the laboratory environment is to apply a burst pulse, usually an interference with a voltage of 4 KV and a frequency of 100 KHz. There will be three results during the quality inspection. One is that the communication between the metering chip and the data management chip fails and the meter reading is 0; the second is that the communication between the metering chip and the data management chip is successful but the error is large; the third is that the communication between the metering chip and the data management chip is successful and there is no error or the error is very small. Only the electric meters in the third case are put into the actual use scenario for use.

[0037] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

[0038] Although the specific implementation manners of the present invention are described above, it is not a limitation on the protection scope of the present invention. Those skilled in the art should understand that, based on the technical solution of the present invention, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the present invention.

Claims

1. A method for protecting an electric energy meter from pulse interference, characterized in that: Applied to the measurement and detection device, including the following steps: Filtering the electrical signal through a filtering circuit to obtain a first filtered signal; After receiving the signal request sent by the metering display device, the first filtered signal is sent to the metering display device, and the first filtered signal is used for the metering display device to display circuit information.

2. A method for protecting an electric energy meter from pulse interference as claimed in claim 1, characterized in that: The filtering circuit is a multi-stage filtering circuit.

3. A method for protecting electric energy meter from pulse interference as claimed in claim 2, characterized in that: The multi-stage filtering circuit includes a primary filtering module and a secondary filtering module; The primary filter module comprises a first input terminal and a second input terminal, and the primary filter module and the secondary filter module are connected in series; The secondary filtering module includes a first output terminal and a second output terminal.

4. A method for protecting an electric energy meter from pulse interference as claimed in claim 3, characterized in that: The primary filtering module comprises: a first resistor, wherein a first end of the first resistor is a first input end, a second end of the first resistor is connected to a first end of a first capacitor, a second end of the first capacitor is connected to a first end of a second capacitor, and the second end of the first capacitor and the first end of the second capacitor are both grounded; a second resistor, wherein a first end of the second resistor is a second input end, and a second end of the second resistor is connected to a second end of the second capacitor; A third capacitor, wherein a first end of the third capacitor is connected to the second end of the first resistor and the first end of the first capacitor, and a second end of the third capacitor is connected to the second end of the second resistor and the second end of the second capacitor.

5. A method for protecting electric energy meter from pulse interference as claimed in claim 3, characterized in that: The secondary filtering module comprises: a third resistor, wherein a first end of the third resistor is connected to a first end of a fourth capacitor, a second end of the third resistor is connected to a first end of a fifth capacitor, and a second end of the third resistor is a first output end; a fourth resistor, wherein a first end of the fourth resistor is connected to a second end of the fourth capacitor, a second end of the fourth resistor is connected to a second end of the fifth capacitor, and a second end of the fourth resistor is a second output end.

6. A method for protecting electric energy meter from pulse interference, characterized in that: Applied to a metering display device, the method comprises the following steps: Sending a signal request to a metering and detecting device, and receiving a first filtered signal sent by the metering and detecting device; Determine whether the first filtered signal is valid data. If the first filtered signal is not valid data, resend a signal request to the metering and detection device, and receive the first filtered signal sent by the metering and detection device. If the first filtered signal is valid data, parse the first filtered signal and display the parsed circuit information.

7. A method for protecting an electric energy meter from pulse interference as claimed in claim 6, characterized in that: The valid data is a non-zero number.

8. A method for protecting an electric energy meter from pulse interference as claimed in claim 6, characterized in that: The number of times of resending the signal request to the metering and detecting device is N rounds, each round is M times, and the interval between sending the signal request in each round is P seconds, wherein N, M and P are all natural numbers.

9. An electric energy meter pulse interference protection device, characterized in that: Applied to measurement and testing equipment, including: A device for filtering the electrical signal through a filtering circuit to obtain a first filtered signal; A device for sending the first filtered signal to the metering display device after receiving a signal request sent by the metering display device, wherein the first filtered signal is used for the metering display device to display circuit information.

10. An electric energy meter pulse interference protection device, characterized in that: Applied to metering display devices, including: A device for sending a signal request to a metering and detecting device, and receiving a first filtered signal sent by the metering and detecting device; A device for determining whether the first filtered signal is valid data; if the first filtered signal is not valid data, resending a signal request to the metering and detecting device, and receiving the first filtered signal sent by the metering and detecting device; if the first filtered signal is valid data, parsing the first filtered signal and displaying the parsed circuit information.

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