A system and method for measuring electric energy phase

Abstract

The invention relates to the technical field of phase recognition of electric energy meters, and discloses an electric energy phase measurement system and method. The system connects a measurement switch and an electric energy meter to each other via a one-to-one Bluetooth connection through a Bluetooth module, converts a zero-crossing signal of the electric energy meter into a zero-crossing signal data frame, generates a zero-crossing interrupt signal according to the zero-crossing signal data frame, sends the zero-crossing interrupt signal to a measurement main control module through an I / O port, receives the zero-crossing interrupt signal with the highest interrupt priority, queries a pre-acquired current zero-crossing state phase word based on the zero-crossing interrupt signal, and obtains a phase recognition result of the electric energy meter according to the query result, thereby improving the phase recognition efficiency. At the same time, the problem of interference source introduction of the intrusive recognition technology is avoided, and the recognition accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy meter phase identification, and in particular to an electric energy phase measurement system and method. Background Art

[0002] Line loss analysis of low-voltage distribution grid is the main content of line loss management in distribution network. It is necessary to improve the efficiency of electric energy use by managing and controlling line loss and reducing line loss. With the construction of national high-quality substations, accurate calculation and analysis of substation line loss plays an increasingly important role. Accurate analysis and calculation of line loss depends on accurate identification of topological relationships. Traditional power grids only have information on electric energy meters at the substation or substation box level, but no three-phase phase information of A, B, and C at the user end. Therefore, phase recognition technology is needed to analyze accurate topological relationships and realize the calculation of line loss and phase-separated line loss. As one of the main technologies for topological recognition, phase recognition technology has been widely studied and applied.

[0003] The current phase recognition technology is divided into two types: intrusive and non-intrusive. The intrusive recognition rate is relatively high, but it requires a technology that injects a specific current signal into the power line for recognition. The active injection of the signal introduces an interference source to the power line transmission, which is very susceptible to interference, which is not conducive to the communication and measurement of the power grid, and requires a special intrusive transmission source circuit design with high cost. Non-intrusive recognition technology is currently mainly implemented through software algorithms, such as voltage tracking method, but the recognition accuracy is relatively low, and it is very susceptible to interference, the recognition time is long, and the recognition efficiency is low. Summary of the invention

[0004] The present invention provides an electric energy phase measurement system and method, which solve the technical problems that the current phase recognition technology is easily interfered, has low recognition accuracy and low recognition efficiency.

[0005] In view of this, the first aspect of the present invention provides an electric energy phase measurement system, which uses an electric energy meter, including: a measurement switch and a first Bluetooth module; the measurement switch is provided with a second Bluetooth module and a measurement main control module, the electric energy meter is provided with the first Bluetooth module, the first Bluetooth module is connected to the second Bluetooth module by Bluetooth communication, and the second Bluetooth module is connected to the measurement main control module;

[0006] The first Bluetooth module is used to convert the zero-crossing signal of the electric energy meter into a zero-crossing signal data frame, and send the zero-crossing signal data frame to the second Bluetooth module;

[0007] The second Bluetooth module is used to generate a zero-crossing interrupt signal according to the zero-crossing signal data frame, and send the zero-crossing interrupt signal to the measurement main control module through the I / O port;

[0008] The measurement main control module is used to receive the zero-crossing interrupt signal with the highest interrupt priority, and query the pre-acquired current zero-crossing state phase word based on the zero-crossing interrupt signal, and obtain the phase recognition result of the electric energy meter according to the query result.

[0009] Preferably, the electric energy meter is further provided with a zero-crossing detection module, and the zero-crossing detection module is connected to the first Bluetooth module;

[0010] The zero-crossing detection module is used to detect the zero-crossing signal of the electric energy meter. If the zero-crossing signal is detected, the zero-crossing signal is sent to the first Bluetooth module.

[0011] Preferably, a three-phase zero-crossing detection module is further provided in the measurement switch, and the three-phase zero-crossing detection module is electrically connected to the measurement main control module, and is used to detect the three-phase positive zero-crossing state signal of the electric energy meter, and is also used to send the three-phase positive zero-crossing state signal to the measurement main control module in an interrupt mode;

[0012] The measurement main control module is also used to update the current zero-crossing state phase word based on the three-phase positive zero-crossing state signal.

[0013] Preferably, the second Bluetooth module and the measurement main control module interact with each other via a preset serial port protocol data.

[0014] Preferably, the second Bluetooth module is also used to connect to the Bluetooth module in the electric energy meter in the meter box file information according to the meter box file information pre-issued by the master station.

[0015] Preferably, the zero-crossing detection module is further used to send the zero-crossing signal to the first Bluetooth module in an interrupt manner.

[0016] Preferably, the first Bluetooth module is further used to convert the zero-crossing signal into a zero-crossing signal data frame based on a preset data frame protocol.

[0017] In a second aspect, the present invention further provides an electric energy phase measurement method, using an electric energy meter, including: a measurement switch; the electric energy meter and the measurement switch are connected via Bluetooth communication; the method includes:

[0018] In response to a phase identification instruction request, converting the zero-crossing signal of the electric energy meter into a zero-crossing signal data frame, and sending the zero-crossing signal data frame to the measurement switch via Bluetooth;

[0019] A zero-crossing interrupt signal is generated according to the zero-crossing signal data frame by the measurement switch, and the zero-crossing interrupt signal is received with the highest interrupt priority. A pre-acquired current zero-crossing state phase word is queried based on the zero-crossing interrupt signal, and a phase identification result of the electric energy meter is obtained according to the query result.

[0020] Preferably, before the step of generating a zero-crossing interrupt signal according to the zero-crossing signal data frame by the measurement switch, receiving the zero-crossing interrupt signal with the highest interrupt priority, and querying the pre-acquired current zero-crossing state phase word based on the zero-crossing interrupt signal, and obtaining the phase identification result of the electric energy meter according to the query result, it also includes:

[0021] In response to a three-phase positive zero-crossing detection instruction request, detecting a three-phase positive zero-crossing state signal of the electric energy meter, and sending the three-phase positive zero-crossing state signal to the measuring switch in an interrupt mode;

[0022] The current zero-crossing state phase word is updated based on the three-phase positive zero-crossing state signal through the measurement switch.

[0023] Preferably, the method further comprises:

[0024] The Bluetooth module in the measuring switch is connected to the Bluetooth module in the electric energy meter in the meter box file information according to the meter box file information pre-issued by the main station.

[0025] It can be seen from the above technical solutions that the present invention has the following advantages:

[0026] The present invention is based on Bluetooth communication technology, and a one-to-one Bluetooth connection is established between a measuring switch and an electric energy meter through a Bluetooth module, and a zero-crossing point signal of the electric energy meter is converted into a zero-crossing signal data frame, and a zero-crossing interrupt signal is generated according to the zero-crossing signal data frame and the zero-crossing interrupt signal is sent to a measuring main control module through an I / O port, and the zero-crossing interrupt signal is received with the highest interrupt priority, and a pre-acquired current zero-crossing state phase word is queried based on the zero-crossing interrupt signal, and a phase recognition result of the electric energy meter is obtained according to the query result, so that the interrupt signal is detected and received by using the highest priority interrupt mode, the time delay is greatly reduced, and the phase recognition efficiency is improved. At the same time, the problem of interference source introduction of the intrusive recognition technology is avoided, and the recognition accuracy is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the structure of an electric energy phase measurement system provided by the first embodiment of the present invention;

[0028] Figure 2 A schematic diagram of comparing the zero-crossing state in the measuring switch and the zero-crossing data frame of the electric energy meter provided by an embodiment of the present invention;

[0029] Figure 3 A schematic diagram of the structure of an electric energy phase measurement system provided for a second embodiment of the present invention;

[0030] Figure 4 A schematic diagram of a zero-crossing detection circuit provided by an embodiment of the present invention;

[0031] Figure 5 A flow chart of an electric energy phase measurement method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments 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 creative work are within the scope of protection of the present invention.

[0033] For easier understanding, see Figure 1 The first embodiment of the present invention provides an electric energy phase measurement system, which uses an electric energy meter 10 and includes: a measurement switch 20 and a first Bluetooth module 11; the measurement switch 20 is provided with a second Bluetooth module 21 and a measurement main control module 22, the electric energy meter 10 is provided with the first Bluetooth module 11, the first Bluetooth module 11 is connected to the second Bluetooth module 21 by Bluetooth communication, and the second Bluetooth module 21 is connected to the measurement main control module 22.

[0034] In one example, the second Bluetooth module 21 and the measurement main control module 22 interact with each other via a preset serial port protocol data.

[0035] The serial port protocol includes but is not limited to the UART serial port protocol. The UART (Universal Asynchronous Receiver / Transmitter) serial port protocol is a serial, asynchronous, full-duplex communication protocol.

[0036] The first Bluetooth module 11 is used to convert the zero-crossing signal of the electric energy meter into a zero-crossing signal data frame, and send the zero-crossing signal data frame to the second Bluetooth module 21;

[0037] The second Bluetooth module 21 is used to generate a zero-crossing interrupt signal according to the zero-crossing signal data frame, and send the zero-crossing interrupt signal to the measurement main control module 22 through the I / O port;

[0038] After receiving the zero-crossing signal data frame, the second Bluetooth module 21 immediately outputs a zero-crossing interrupt signal to the measurement main control module 22 through the I / O port, and simultaneously replies to confirm and turn off the zero-crossing detection function of the electric energy meter, switching to normal communication mode.

[0039] The measurement main control module 22 is used to receive the zero-crossing interrupt signal with the highest interrupt priority, and query the pre-acquired current zero-crossing state phase word based on the zero-crossing interrupt signal, and obtain the phase recognition result of the electric energy meter according to the query result.

[0040] In an example, the second Bluetooth module 21 is further used to connect to the Bluetooth module in the electric energy meter in the meter box file information according to the meter box file information pre-issued by the master station.

[0041] The meter box file information includes the electric energy meter ID information and the Bluetooth address of the Bluetooth module in the electric energy meter. The second Bluetooth module 21 can be used to establish a one-to-one Bluetooth connection with the Bluetooth module in the electric energy meter in the meter box file information. After the connection is established, the phase recognition instruction is started to inform the connected electric energy meter to start the phase recognition detection. After the electric energy meter responds and confirms, it switches to the zero-crossing data frame receiving mode.

[0042] The measuring switch 20 connects to the electric energy meter in the file one-to-one via Bluetooth according to the meter box file information sent by the master station, and starts the phase identification instruction after the connection is established. After the electric energy meter receives the instruction, it turns on the zero-crossing detection and identifies the phases one by one, and finally obtains the phase distribution relationship of the electric energy meter in the entire meter box, which can be applied to the precise topology identification in the meter box and assist in the calculation of the line loss and phase line loss in the meter box.

[0043] The zero-crossing state phase word is the state information word detected by the three-phase zero-crossing detection module inside the measuring switch 20. For example, one byte is used to represent the zero-crossing state of the three phases ABC, BIT0 is the zero-crossing of the A phase, BIT1 is the zero-crossing of the B phase, and BIT2 is the zero-crossing of the C phase. It is used to compare with the zero-crossing signal data frame transmitted from the electric energy meter side.

[0044] It should be noted that since the frequency of the three-phase alternating current in the power grid is 50Hz and the period is 20ms, there is an angular difference of 120° between the three-phase electricity of ABC, resulting in a time difference of about 6.67ms for the three-phase electricity to cross zero in the forward or reverse direction. Due to the existence of this time difference, this time difference can be used to explain that the zero-crossing points of the three-phase alternating current are different, and the phase information can be accurately identified.

[0045] Specifically, the phase recognition principle is as follows Figure 2 As shown, Figure 2 The diagram illustrates the comparison between the zero-crossing interrupt signal and the zero-crossing state phase word in the measuring switch. When the measuring switch receives the zero-crossing signal data frame, it generates a zero-crossing interrupt signal (generating the zero-crossing signal in an interruption manner), and compares the zero-crossing interrupt signal with the current zero-crossing state phase word obtained inside the measuring switch to determine that the electric energy meter is installed on phase B.

[0046] It should be noted that the present invention is based on Bluetooth communication technology, and a one-to-one Bluetooth connection is established between the measuring switch and the electric energy meter through a Bluetooth module, and the zero-crossing signal of the electric energy meter is converted into a zero-crossing signal data frame, and a zero-crossing interrupt signal is generated according to the zero-crossing signal data frame and the zero-crossing interrupt signal is sent to the measurement main control module through the I / O port, and the zero-crossing interrupt signal is received with the highest interrupt priority, and the current zero-crossing state phase word obtained in advance is queried based on the zero-crossing interrupt signal, and the phase recognition result of the electric energy meter is obtained according to the query result, so as to detect and receive the interrupt signal by using the highest priority interrupt mode, greatly reduce the delay, improve the phase recognition efficiency, and at the same time, avoid the problem of interference source introduction of intrusive recognition technology, and improve the recognition accuracy.

[0047] See also Figure 3 The second embodiment of the present invention provides an electric energy phase measurement system, which uses an electric energy meter 30 and includes: a measurement switch 40, a zero-crossing detection module 31 and a first Bluetooth module 32; the measurement switch 40 is provided with a second Bluetooth module 41 and a measurement main control module 42, the electric energy meter 30 is provided with a zero-crossing detection module 31 and the first Bluetooth module 32, the first Bluetooth module 32 is connected to the second Bluetooth module 41 via Bluetooth communication, and the second Bluetooth module 41 is connected to the measurement main control module 42;

[0048] The zero-crossing detection module 31 is used to detect a zero-crossing signal of the electric energy meter 30 , and if a zero-crossing signal is detected, the zero-crossing signal is sent to the first Bluetooth module 32 .

[0049] In one example, the zero-crossing detection module 31 may be implemented as follows: Figure 4 The zero-crossing detection circuit shown or the zero-crossing detection functional module inside the metering chip.

[0050] In one achievable manner, the zero-crossing detection module 31 is further configured to send the zero-crossing point signal to the first Bluetooth module 32 in an interrupt manner.

[0051] It is understandable that after the zero-crossing detection module 31 on the electric energy meter 30 detects the zero-crossing signal, it informs the first Bluetooth module 32 inside the electric energy meter 30 in an interruption mode (fastest response), thereby improving the response efficiency.

[0052] The first Bluetooth module 32 is used to convert the zero-crossing signal of the electric energy meter 30 into a zero-crossing signal data frame, and send the zero-crossing signal data frame to the second Bluetooth module 41;

[0053] The second Bluetooth module 41 is used to generate a zero-crossing interrupt signal according to the zero-crossing signal data frame, and send the zero-crossing interrupt signal to the measurement main control module 42 through the I / O port;

[0054] The measurement main control module 42 is used to receive the zero-crossing interrupt signal with the highest interrupt priority, and query the pre-acquired current zero-crossing state phase word based on the zero-crossing interrupt signal, and obtain the phase recognition result of the electric energy meter 30 according to the query result.

[0055] In one achievable method, a three-phase zero-crossing detection module is also provided in the measurement switch 40, and the three-phase zero-crossing detection module is electrically connected to the measurement main control module 42, and is used to detect the three-phase positive zero-crossing state signal of the electric energy meter 30, and is also used to send the three-phase positive zero-crossing state signal to the measurement main control module 42 in an interrupt manner.

[0056] The measurement main control module 42 is further used to update the current zero-crossing state phase word based on the three-phase positive zero-crossing state signal.

[0057] The zero-crossing state phase word is the phase of the zero-crossing state at that moment.

[0058] In one achievable manner, the first Bluetooth module 32 is further configured to convert the zero-crossing signal into a zero-crossing signal data frame based on a preset data frame protocol.

[0059] The data frame protocol includes but is not limited to the DL / T645-2007 data frame protocol.

[0060] Among them, the Bluetooth communication frame format is shown in Table 1:

[0061] Table 1

[0062]

[0063] Among them, the leading code is: 0xAA or 0x55. When the highest bit of the address is 1, the leading code is 0xAA, otherwise it is 0x55.

[0064] Access address: Take the lower 4 bytes of the communication address, in order from low byte to high byte.

[0065] Check code: CRC24. CRC calculation is done by hardware, which is consistent with the BLE definition.

[0066] CRC initial value: 0x555555

[0067] Data payload length definition: 1 byte, maximum length 251 bytes. The shortest data is 0.

[0068] Data domain payload definition:

[0069] DL / T645-2007 data frame protocol. The specific contents are shown in Table 2:

[0070] Table 2

[0071]

[0072]

[0073] Frame start character 68H: marks the beginning of a frame of information, and its value is 68H=01101000B.

[0074] Address field A0~A5: communication address of electric energy meter, 6 bytes;

[0075] Control code C: 0x07;

[0076] The data field length L is the number of bytes in the data field. L≤200 when reading data, L≤50 when writing data, and L=0 means there is no data field.

[0077] The data field includes data identification, data, etc. Its structure changes with the function of the control code. During transmission, the sender adds 33H per byte, and the receiver subtracts 33H per byte. The specific content of the data field is shown in Table 3:

[0078] Table 3

[0079]

[0080] Check code CS

[0081] The modulo 256 sum of all bytes from the first frame start character to the check code, that is, the binary arithmetic sum of all bytes, excluding overflow values ​​exceeding 256.

[0082] End character 16H

[0083] Marks the end of a frame of information, its value is 16H=00010110B.

[0084] The data domain contains the DL / T645-2007 protocol data identifier and zero-crossing information, a total of 17 bytes, so the zero-crossing signal data frame is 27 bytes in total. After the formation is completed, it is immediately started to send. The zero-crossing data frame is modulated at a rate of 1Mbit / s, and the transmission time is much less than 1ms. Since the three-phase zero-crossing time difference is 6.67ms, the entire process cannot exceed this time, otherwise it will be an invalid judgment.

[0085] To this end, the electric energy meter 30 and the measuring switch 40 in the system use the highest priority interrupt method to detect and receive interrupt signals for zero-crossing signals. The delay is basically small. The main Bluetooth signal frame sending time in the entire interaction process is relatively long, but due to the high rate, the delay of the entire system generally does not exceed 2ms, and the detection is accurate and reliable.

[0086] The above is a detailed description of an embodiment of an electric energy phase measurement system provided by the present invention. The following is a detailed description of an embodiment of an electric energy phase measurement method provided by the present invention.

[0087] The present invention also provides an electric energy phase measurement method, using an electric energy meter, including: a measurement switch; the electric energy meter and the measurement switch are connected via Bluetooth communication; for ease of understanding, please refer to Figure 5 , the method comprises:

[0088] Step 1: In response to a phase identification instruction request, convert the zero-crossing signal of the electric energy meter into a zero-crossing signal data frame, and send the zero-crossing signal data frame to the measurement switch via Bluetooth.

[0089] Among them, before step 1, it also includes:

[0090] Detecting a zero-crossing signal of the electric energy meter.

[0091] Step 2: Generate a zero-crossing interrupt signal according to the zero-crossing signal data frame through the measurement switch, receive the zero-crossing interrupt signal with the highest interrupt priority, and query the pre-acquired current zero-crossing state phase word based on the zero-crossing interrupt signal, and obtain the phase recognition result of the electric energy meter according to the query result.

[0092] In a specific embodiment, before step 2, the method further includes:

[0093] Step 21, in response to the three-phase positive zero-crossing detection instruction request, detecting the three-phase positive zero-crossing state signal of the electric energy meter, and sending the three-phase positive zero-crossing state signal to the measurement switch in an interrupt mode;

[0094] Step 22: Update the current zero-crossing state phase word based on the three-phase positive zero-crossing state signal through the measurement switch.

[0095] In a specific embodiment, the method further comprises:

[0096] The Bluetooth module in the measuring switch is connected to the Bluetooth module in the electric energy meter in the meter box file information according to the meter box file information pre-issued by the master station.

[0097] In a specific embodiment, the method further comprises:

[0098] The zero-crossing signal is sent to the Bluetooth module in the electric energy meter in an interrupt manner.

[0099] In a specific embodiment, the method further comprises:

[0100] The zero-crossing signal is converted into a zero-crossing signal data frame based on a preset data frame protocol.

[0101] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the method described above can refer to the corresponding process in the aforementioned system embodiment, and will not be repeated here.

[0102] In the several embodiments provided by the present invention, it should be understood that the disclosed systems and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0103] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electric energy phase measurement system, using an electric energy meter, characterized in that: include: A measuring switch and a first Bluetooth module; the measuring switch is provided with a second Bluetooth module and a measuring main control module, the electric energy meter is provided with the first Bluetooth module, the first Bluetooth module is connected to the second Bluetooth module via Bluetooth communication, and the second Bluetooth module is connected to the measuring main control module; The first Bluetooth module is used to convert the zero-crossing signal of the electric energy meter into a zero-crossing signal data frame, and send the zero-crossing signal data frame to the second Bluetooth module; The second Bluetooth module is used to generate a zero-crossing interrupt signal according to the zero-crossing signal data frame, and send the zero-crossing interrupt signal to the measurement main control module through the I / O port; The measurement main control module is used to receive the zero-crossing interrupt signal with the highest interrupt priority, and query the pre-acquired current zero-crossing state phase word based on the zero-crossing interrupt signal, and obtain the phase recognition result of the electric energy meter according to the query result; A three-phase zero-crossing detection module is also provided in the measurement switch, and the three-phase zero-crossing detection module is electrically connected to the measurement main control module, and is used to detect the three-phase positive zero-crossing state signal of the electric energy meter, and is also used to send the three-phase positive zero-crossing state signal to the measurement main control module in an interrupt mode; The measurement main control module is also used to update the current zero-crossing state phase word based on the three-phase positive zero-crossing state signal.

2. The electric energy phase measurement system according to claim 1, characterized in that: The electric energy meter is further provided with a zero-crossing detection module, the zero-crossing detection module and the first Bluetooth module; The zero-crossing detection module is used to detect the zero-crossing signal of the electric energy meter. If the zero-crossing signal is detected, the zero-crossing signal is sent to the first Bluetooth module.

3. The electric energy phase measurement system according to claim 1, characterized in that: The second Bluetooth module and the measurement main control module interact with each other via a preset serial port protocol data.

4. The electric energy phase measurement system according to claim 1, characterized in that: The second Bluetooth module is also used to connect to the Bluetooth module in the electric energy meter in the meter box file information according to the meter box file information pre-issued by the master station.

5. The electric energy phase measurement system according to claim 2, characterized in that: The zero-crossing detection module is further configured to send the zero-crossing signal to the first Bluetooth module in an interrupt manner.

6. The electric energy phase measurement system according to claim 1, characterized in that: The first Bluetooth module is further configured to convert the zero-crossing signal into a zero-crossing signal data frame based on a preset data frame protocol.

7. A method for measuring electric energy phase, using an electric energy meter, characterized in that: include: Measuring switch; The electric energy meter and the measuring switch are connected via Bluetooth communication; the method comprises: In response to a phase identification instruction request, converting the zero-crossing signal of the electric energy meter into a zero-crossing signal data frame, and sending the zero-crossing signal data frame to the measurement switch via Bluetooth; Generate a zero-crossing interrupt signal according to the zero-crossing signal data frame through the measurement switch, receive the zero-crossing interrupt signal with the highest interrupt priority, and query the pre-acquired current zero-crossing state phase word based on the zero-crossing interrupt signal, and obtain the phase recognition result of the electric energy meter according to the query result; Before the step of generating a zero-crossing interrupt signal according to the zero-crossing signal data frame by the measurement switch, receiving the zero-crossing interrupt signal with the highest interrupt priority, and querying the pre-acquired current zero-crossing state phase word based on the zero-crossing interrupt signal, and obtaining the phase identification result of the electric energy meter according to the query result, the method further includes: In response to a three-phase positive zero-crossing detection instruction request, detecting a three-phase positive zero-crossing state signal of the electric energy meter, and sending the three-phase positive zero-crossing state signal to the measuring switch in an interrupt mode; The current zero-crossing state phase word is updated based on the three-phase positive zero-crossing state signal through the measurement switch.

8. The electric energy phase measurement method according to claim 7, characterized in that: Also includes: The Bluetooth module in the measuring switch is connected to the Bluetooth module in the electric energy meter in the meter box file information according to the meter box file information pre-issued by the main station.

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