Electric energy meter data misalignment detection method and electric energy meter

Abstract

The embodiment of the invention provides an electric energy meter data misalignment detection method and an electric energy meter. The method comprises the steps that in response to a received meter reading data inspection starting signal, the voltage at the rear end of a voltage acquisition circuit of each phase of the electric energy meter, the current at the rear end of a current acquisition circuit of each phase and the active power output by a metering chip in the electric energy meter are obtained, and the active power is determined by the metering chip according to the voltage at the rear end and the current at the rear end; according to the rear-end voltage, the rear-end current and the active power, whether the electric energy meter has an abnormal condition is determined, and the abnormal condition comprises at least one of current loss, voltage loss, wiring error and electricity consumption metering misalignment; and under the condition that the electric energy meter is abnormal, reporting abnormal data to a meter reading data misalignment verification terminal. The method can automatically detect the meter reading data of the electric energy meter, and the detection efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of electrical technology, and in particular to a method for detecting inaccurate data in an electricity meter and an electricity meter. Background Technology

[0002] As a metering instrument for measuring electrical energy, electricity meters are required to be accurate and stable, and to ensure long-term reliable operation. The accuracy of electricity meter readings has a significant impact on the operation of the power system. Therefore, it is necessary to promptly detect any abnormalities in electricity meters to ensure the accuracy of the meter readings.

[0003] In existing technologies, users need to actively check whether their electricity meters are malfunctioning, or they need to notify the power supplier to come and verify them, or the power supplier needs to actively check the user's electricity consumption.

[0004] However, this method of existing technology has low efficiency in detecting anomalies in electricity meters. Summary of the Invention

[0005] This application provides a method for detecting inaccurate electricity meter data and an electricity meter, which can realize automatic detection of electricity meter reading data and improve detection efficiency.

[0006] In a first aspect, embodiments of this application provide a method for detecting inaccurate data in an electricity meter, including:

[0007] In response to receiving a meter reading data verification start signal, the back-end voltage of the voltage acquisition circuit of each phase of the energy meter, the back-end current of the current acquisition circuit of each phase, and the active power output by the metering chip in the energy meter are acquired. The active power is determined by the metering chip based on the back-end voltage and the back-end current.

[0008] Based on the back-end voltage, back-end current, and active power, determine whether the energy meter is in any abnormal condition. The abnormal condition includes at least one of the following: current loss, voltage loss, wiring error, and inaccurate electricity consumption measurement.

[0009] In the event of an abnormality in the electricity meter, the abnormal data is reported to the meter reading data inaccuracy verification terminal.

[0010] In one possible implementation, determining whether the electricity meter is experiencing a voltage loss includes:

[0011] When the energy meter is a single-phase energy meter or a three-phase energy meter with three-phase four-wire connection, and the voltage at the back end is less than the first voltage threshold, it is determined that the energy meter is undervoltage.

[0012] When the energy meter is a three-phase energy meter with three-phase three-wire connection, and the voltage at the back end is less than the second voltage threshold, it is determined that the energy meter has a voltage loss, and the first voltage threshold is greater than the second voltage threshold.

[0013] In one possible implementation, determining whether the electricity meter has current loss and wiring errors includes:

[0014] If the back-end current is less than zero, it is determined that there is a wiring error in the energy meter;

[0015] When the back-end current is equal to zero, control the current acquisition circuit to connect at least one resistor in series at the front end;

[0016] Reacquire the back-end current of the current acquisition circuit after at least one resistor is connected in series at the front end;

[0017] If the current at the back end of the current acquisition circuit after at least one resistor is connected in series at the front end is equal to zero, it is determined that the energy meter is experiencing current loss.

[0018] In one possible implementation, determining whether the electricity meter has inaccurate electricity consumption measurement includes:

[0019] When the energy meter is a single-phase energy meter, the first error rate is determined according to the first formula, the back-end voltage, the back-end current, and the active power;

[0020] In the case of a three-phase energy meter with a three-phase four-wire connection, the second error rate is determined according to the second formula, the back-end voltage, the back-end current, and the active power.

[0021] In the case of a three-phase energy meter with a three-phase three-wire connection, the third error rate is determined based on the third formula, the back-end voltage, the back-end current, and the active power.

[0022] If any one of the first error rate, the second error rate, and the third error rate is greater than the first error rate threshold, it is determined that the electricity meter has an inaccurate electricity consumption measurement.

[0023] In one possible implementation, the first formula is:

[0024]

[0025] In the above formula, Y1 is the metering error rate, P is the active power, U is the back-end voltage, and I is the back-end current. Power factor.

[0026] In one possible implementation, the second formula is:

[0027]

[0028] In the above formula, Y2 is the metering error rate, P represents the active power, U is the back-end voltage, and I is the back-end current. As for the power factor, A, B, and C are the three phases of the electricity meter.

[0029] In one possible implementation, the third formula is:

[0030]

[0031] In the above formula, Y3 is the metering error rate, P represents the active power, A, B, and C are the three phases of the energy meter, U̇ represents the voltage phasor, and I is the line current value. Power factor.

[0032] In one possible implementation, the energy meter is a three-phase energy meter with a three-phase four-wire connection. Each phase of the energy meter includes a voltage input line and a current input line. The current input line is the secondary output line connected to a current transformer, and the voltage input line is the primary input line not connected to the current transformer. The method further includes:

[0033] The error rate of the current transformer is determined according to the fourth formula;

[0034] If the error rate of the current transformer is greater than the second error rate threshold, it is determined that the current transformer has an abnormal situation of inaccurate transformation.

[0035] The fourth formula is:

[0036]

[0037] In the above formula, A, B, and C are the three phases of the energy meter, G is the error rate of the current transformer, I1 represents the secondary current value after the current in the voltage input line is transformed by the test transformer, I0 represents the current value of the current input line in the same phase as the voltage input line, and the transformation ratio of the test transformer is the same as the rated transformation ratio of the current transformer.

[0038] In one possible implementation, the energy meter is a three-phase energy meter with three-phase three-wire connection, and each phase of the energy meter includes a voltage input line and a current input line, both of which are secondary output lines connected to a combined current transformer.

[0039] The method further includes:

[0040] Determine the error rate of the combined current transformer according to the fifth formula;

[0041] If the error rate of the combined current transformer is greater than the second error rate threshold, it is determined that the combined current transformer has an abnormal situation of inaccurate transformation.

[0042] The fifth formula is:

[0043]

[0044] In the above formula, A, B, and C represent the three phases of the electricity meter, G represents the error rate of the combined current transformer, and AB and CB represent the line values. The subscript 1 indicates the secondary current after the voltage input current flows through the test transformer and is transformed, and the subscript 0 indicates the current input current. The transformation ratio of the test transformer is the same as the rated transformation ratio of the combined transformer.

[0045] Secondly, embodiments of this application provide an energy meter, including: a memory and a processor;

[0046] The memory stores computer-executed instructions;

[0047] The processor executes computer execution instructions stored in the memory, causing the processor to perform the first aspect and / or various possible implementations of the first aspect as described above.

[0048] The automatic detection method and electricity meter for inaccurate meter data provided in this application embodiment automatically verify the accuracy of meter reading data through the data inaccuracy detection method and give the reason for the inaccurate meter reading data. In this way, abnormalities in electricity meter reading data can be detected in time, avoiding electricity bill errors and disputes. At the same time, it eliminates the need for staff to go to the site to calibrate the meter, thus improving the verification efficiency. Attached Figure Description

[0049] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0050] Figure 1 This is a schematic diagram of the structure of a single-phase energy meter provided in an embodiment of this application;

[0051] Figure 2 This is a schematic flowchart of the method for detecting inaccurate data of an energy meter provided in an embodiment of this application;

[0052] Figure 3 A hardware schematic diagram of an energy meter without a current transformer provided for an embodiment of this application;

[0053] Figure 4 A hardware schematic diagram of an energy meter with a current transformer provided for an embodiment of this application;

[0054] Figure 5 A flowchart of a method for detecting data inaccuracies in an energy meter without a current transformer, provided in an embodiment of this application;

[0055] Figure 6 This is a flowchart of a method for detecting data inaccuracies in an energy meter with a low-voltage current transformer, provided in an embodiment of this application.

[0056] Figure 7A flowchart illustrating the data inaccuracy detection method for an energy meter with a combined current transformer, provided in an embodiment of this application.

[0057] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0058] Traditional electricity meters require users to proactively request meter verification from the power company, or power company staff to contact users by phone to confirm significant fluctuations in electricity consumption. Only when users report discrepancies will power company personnel bring a calibration device to the site for verification. Meters without any feedback are not verified, which can easily lead to billing errors and disputes. Furthermore, when traditional meters malfunction, staff must be on-site with a calibration device to investigate the specific cause, which is very slow.

[0059] To address the aforementioned issues, this application provides an automatic detection method for inaccurate electricity meter data and an electricity meter. In addition to performing normal electricity consumption metering and reading, this electricity meter can automatically verify the accuracy of the meter reading data through the data inaccuracy detection method, providing the reason for any inaccuracies. This allows for timely detection of anomalies in the meter reading data, preventing electricity billing errors and disputes. Furthermore, it eliminates the need for on-site meter calibration by personnel, improving verification efficiency. In addition, once inaccurate meter reading data is detected, the electricity meter can transmit the relevant user's inaccurate reading data information to the meter reading data inaccuracy verification terminal at the distribution station. The verification terminal then uploads this information to the main station system. Upon receiving the inaccurate reading data information, the main station system generates a corresponding inaccurate reading data processing work order and, based on the user's distribution station location, sends a text message to the relevant distribution station manager, reminding them to promptly maintain the user's metering device.

[0060] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0061] The electricity meter provided in this application can be a single-phase electricity meter or a three-phase electricity meter. Taking a single-phase electricity meter as an example... Figure 1 This is a schematic diagram of the structure of a single-phase energy meter provided in an embodiment of this application, as shown below. Figure 1As shown, the electricity meter includes at least an LCD display 11, indicator lights 12 (which can be further subdivided into power, pulse, and signal indicator lights), a communication module 13, fixing screws 14, wire interfaces (specifically including live wire inlet 151, live wire outlet 152, neutral wire inlet 153, and neutral wire outlet 154), a test mutual inductance module 16, a button module (specifically including an up button 171 and a down button 172), and a meter reading data inaccuracy indicator light 18.

[0062] In addition to displaying normal meter reading data, the LCD screen 11 can also display the reasons for any abnormal meter reading data detected by the electricity meter.

[0063] Indicator light 12 can be used to indicate power, pulse flashing, and communication signal strength.

[0064] The communication module 13 can be replaced with a carrier communication module or a wireless communication module as needed.

[0065] The fixing screw 14 is used to fix the wire connected to the electricity meter.

[0066] The wire connector is used to insert wires.

[0067] The test transformer module 16 can be a current transformer. This test transformer module has a variety of matching transformation ratios to choose from. It can be replaced with the same transformation ratio as the metering current transformer that is matched with the energy meter. The accuracy of this test transformer module is not as high as that of the metering current transformer. It is only used to detect whether the metering current transformer is seriously inaccurate or damaged.

[0068] The button module is used to flip through pages on the LCD screen to find various types of meter reading data.

[0069] The meter reading data inaccuracy indicator light 18 is used to provide a prompt when meter reading data inaccuracy is detected. Under normal circumstances, this indicator light is not lit. When meter reading data is inaccurate, the meter reading data inaccuracy indicator light is constantly lit.

[0070] In this embodiment, the electricity meter can be divided into two types: one with a current transformer and one without. Depending on whether the electricity meter is equipped with a current transformer, the hardware circuit diagram of the electricity meter can be divided into a hardware schematic diagram without a transformer and a hardware schematic diagram with a transformer.

[0071] Figure 2 This is a schematic flowchart of a method for detecting data inaccuracies in electricity meters provided in an embodiment of this application. This method can be applied to electricity meters or to a standalone data inaccuracy detection device, and the data inaccuracy detection device works in conjunction with the electricity meter to implement this solution. Figure 2 As shown, the method may specifically include the following steps:

[0072] Step S210: In response to receiving the meter reading data verification start signal, acquire the voltage at the back end of the voltage acquisition circuit of each phase of the energy meter, the current at the back end of the current acquisition circuit of each phase, and the active power output by the metering chip in the energy meter.

[0073] The active power is determined by the metering chip based on the back-end voltage and back-end current.

[0074] Step S220: Determine whether there is any abnormality in the energy meter based on the back-end voltage, back-end current and active power.

[0075] Abnormal conditions include at least one of the following: current loss, voltage loss, wiring error, and inaccurate electricity metering.

[0076] Step S230: If there is an abnormality in the electricity meter, report the abnormality to the meter reading data inaccuracy verification terminal.

[0077] In this embodiment of the application, by acquiring the voltage at the back end of the voltage acquisition circuit of each phase of the electricity meter, the current at the back end of the current acquisition circuit of each phase, and the active power output by the metering chip in the electricity meter, the accuracy of the meter reading data can be automatically verified, and the reasons for the inaccurate meter reading data can be given. In this way, abnormalities in the electricity meter reading data can be detected in time, avoiding electricity bill errors that lead to electricity bill disputes. At the same time, it eliminates the need for staff to go to the site to calibrate the meter, thus improving the verification efficiency.

[0078] For step S210 above, there are three ways to trigger the check for inaccurate meter reading data:

[0079] (1) The meter reading data inaccuracy test terminal is timed by the internal timer of the meter reading data inaccuracy test terminal. Every time interval (e.g., 15 minutes), the meter reading data inaccuracy test terminal sends a meter reading data test start signal to all the electricity meters under the meter reading data inaccuracy test terminal.

[0080] (2) Select a specific user on the main station system interface, and the main station sends the meter reading data inaccuracy test start signal to the meter reading data inaccuracy test terminal where the specific user is located. The meter reading data inaccuracy test terminal then sends the meter reading data test start signal to the specific user.

[0081] (3) Select a specific user on the meter reading data inaccuracy verification terminal and send a meter reading data verification start signal to that specific user.

[0082] The meter reading data inaccuracy verification terminal communicates wirelessly with the main station system.

[0083] The meter reading data inaccuracy verification terminal is installed under each distribution transformer area. For the meter reading data inaccuracy verification terminal under dedicated users, it communicates with the electricity meter via RS485; for the meter reading data inaccuracy verification terminal under public distribution transformer areas, it communicates with the electricity meter via carrier wave or wireless communication.

[0084] The meter reading data inaccuracy verification terminal contains information on each user. For the meter reading data inaccuracy verification terminal under the distribution transformer area of ​​a dedicated user, it only contains information on one user.

[0085] The user information mainly includes the user number, user name, electricity address, the distribution area and the area manager (including the area manager's mobile phone number), the electricity meter asset number, and the electricity meter's communication address.

[0086] The user information can be periodically exported from the power grid operation system and then distributed to the corresponding meter reading data inaccuracy verification terminals. This ensures that the user information in the meter reading data inaccuracy verification terminals is consistent with the user information on the electricity meter.

[0087] For step S210 above, the electricity meter can be divided into single-phase electricity meter and three-phase electricity meter.

[0088] If the energy meter is a single-phase energy meter, then there is only one power input line as a phase line. At this time, the front end of the voltage acquisition circuit and the front end of the current acquisition circuit are both connected to the power input line. The back end of the voltage acquisition circuit and the back end of the current acquisition circuit are both connected to the metering chip. The metering chip determines the active power based on the back end voltage and back end current.

[0089] If the electricity meter is a three-phase electricity meter, there are multiple phase lines, such as phase lines A, B, and C. These phase lines can be power lines, belonging to the primary input lines. After being transformed by a transformer (such as a current transformer), they become secondary input lines. For example, phase line A is connected to one side of the current transformer. After transformation, the other side of the current transformer is connected to the current input line, serving as the secondary input line. At this time, the front end of the current acquisition circuit is connected to this current input line. Similarly, the front end of the voltage acquisition circuit is connected to the voltage input line. The following sections will provide a detailed explanation of the voltage and current acquisition circuits for single-phase and three-phase electricity meters, using circuit hardware schematics.

[0090] For step S220, the relationship between the back-end current and the preset current threshold can be used to determine whether the energy meter has lost current or has a wiring error. The relationship between the back-end voltage and the preset voltage threshold can also be used to determine whether the energy meter has lost voltage. At the same time, the power value can be calculated based on the back-end voltage, back-end current and power factor. Then, the power value is compared with the active power of the calculation chip. If the error is large (for example, exceeding a certain percentage threshold), it indicates that there is an inaccurate power consumption.

[0091] In step S230, if the electricity meter detects an anomaly, it indicates that the meter reading data may also be inaccurate. In this case, the abnormal data can be reported to the meter reading data inaccuracy verification terminal. The meter reading data inaccuracy verification terminal sends a signal to the main station system indicating that the user's electricity meter reading data is inaccurate, and can also forward the abnormal data to the main station system. The main station system sends a processing SMS to the staff of the transformer substation to which the user belongs, informing them that the electricity meter has an anomaly, and can also specify the type of anomaly based on the abnormal data.

[0092] The reported abnormal data may include at least one of the following: user information, abnormal situation, and meter reading data of the electricity meter.

[0093] To facilitate understanding of the energy meter data inaccuracy detection method provided in this application, the hardware structure of the energy meter is described below to distinguish between single-phase and three-phase energy meters.

[0094] Figure 3 The hardware schematic diagram of the energy meter without current transformer provided in the embodiments of this application is as follows: Figure 3 As shown, it includes a first relay 301, a second relay 302, a first resistor 303, a current acquisition circuit 304, a voltage acquisition circuit 305, a metering chip 306, a key module 307, power, pulse, and communication indicator lights 308, a microcomputer module for meter reading 309, a communication module 310, a microcomputer module for detection 311, an LCD screen 312, and a meter reading data inaccuracy indicator light 313.

[0095] The meter reading circuit mainly includes a microcomputer module 309 for meter reading, a current acquisition circuit 304, a voltage acquisition circuit 305, a metering chip 306, a key module 307, a power supply, pulse, and communication indicator lights 308, a communication module 310, and an LCD display screen 312.

[0096] The meter reading microcomputer module 309 is used to process various data related to meter reading. The current acquisition circuit 304 is used to acquire the downstream current of the power supply line. The voltage acquisition circuit 305 is used to acquire the downstream voltage of the power supply line. The metering chip 306 is used to measure the electricity consumption. The detection circuit mainly includes a detection microcomputer module 311, a first relay, a first resistor (220 ohms), a second relay, a meter reading data inaccuracy indicator, a communication module, and an LCD display.

[0097] The microcomputer module 311 for detection is used to collect various detection signals and analyze them to determine whether the meter reading data is inaccurate and the reason for the inaccuracy.

[0098] In some embodiments, the first relay 301 and the second relay 302 are used to detect whether the energy meter is losing current. The first relay is normally open and the second relay is normally closed. The energizing control signal of the coils of the two relays is controlled by the detection microcomputer module 311. When it is necessary to test the energy meter for loss of current, the detection microcomputer module 311 controls the coils of the first relay 301 and the second relay 302 to be energized, the first relay switch is closed and the second relay switch is opened, so that the front end of the current acquisition circuit 304 is connected to the first resistor 303 (e.g., a 220-ohm resistor) before being connected to the current acquisition circuit 304.

[0099] In this circuit, the detection microcomputer module 311 reacquires the current signal from the other end of the current acquisition circuit. If the reacquired current signal has a current value of zero, it determines that the energy meter is experiencing a current outage. In other words, if the current value output from the back end of the current acquisition circuit is still zero even when the line is under load, it proves that the energy meter is experiencing a current outage.

[0100] When a current loss is detected in the electricity meter, the meter reading inaccurate indicator light will remain on, and the current loss will be displayed on the LCD screen. Specifically, for single-phase electricity meters, the current loss will be displayed directly, while for three-phase electricity meters, the phase with the current loss will be displayed.

[0101] Figure 4 The hardware schematic diagram of the energy meter with current transformer provided in the embodiments of this application is as follows: Figure 4 As shown, it includes a first relay 401, a second relay 402, a first resistor 403, a current acquisition circuit 404, a voltage acquisition circuit 405, a metering chip 406, a key module 407, power, pulse, and communication indicator lights 408, a microcomputer module for meter reading 409, a communication module 410, a microcomputer module for detection 411, an LCD screen 412, and a meter reading data inaccuracy indicator light 413.

[0102] With the above Figure 3The meter reading circuit is the same as the energy meter without current transformer mentioned in the text. It mainly includes a microcomputer module 409 for meter reading, a current acquisition circuit 404, a voltage acquisition circuit 405, a metering chip 406, a key module 407, a power supply, pulse and communication indicator light 408, a communication module 410, and an LCD display screen 412.

[0103] in, Figure 4 Energy meters with current transformers and Figure 3 The difference between a power meter without a current transformer and a power meter is that: (1) the wiring method is different; (2) an additional test current transformer circuit is added.

[0104] For (1) changes in wiring method, three-phase energy meters with an installed capacity of 50 kilowatts or more, and three-phase energy meters applicable to special users with high supply and low metering (the specifications and models of the energy meters are the same in these two cases), the wiring method of the energy meter is three-phase four-wire system, the voltage input line is the primary input line with a phase voltage of 220 volts, and the current input line is the secondary output line with an external current transformer.

[0105] For three-phase energy meters with a three-phase three-wire connection system suitable for dedicated users of high-voltage power supply and high-voltage metering, both the voltage and current input lines need to be stepped down and reduced in current by a combined instrument transformer before being connected to the energy meter. Since the energy meter adopts a three-phase three-wire connection system, both the voltage and current input lines are secondary output lines of the combined instrument transformer.

[0106] In addition, due to Figure 4 The power input line is specifically divided into a current input line and a voltage input line. At this time, one end of the current acquisition circuit is connected to the current input line through the second relay, or the current acquisition circuit is connected to the current input line through the first resistor and the first relay, while one end of the voltage acquisition circuit is connected to the voltage input line.

[0107] For (2), an additional test mutual inductance circuit was added. Figure 4 The detection circuit also includes a third relay 314 and a test transformer 315. One end of the third relay 314 is connected to the voltage input line, and the other end of the third relay 314 is connected to the detection circuit through the test transformer 315. Under normal circumstances, the third relay 314 is normally open, and the energization of the coil is controlled by the detection microcomputer module 311 in the detection circuit.

[0108] In passing Figure 3 and Figure 4 After introducing single-phase and three-phase electricity meters, the following describes in detail how to detect inaccurate electricity meter data through some examples.

[0109] First, refer to the above. Figure 3 or Figure 4Regardless of whether the electricity meter is single-phase or three-phase, if the current at the downstream end of the current acquisition circuit is less than zero, it can be directly determined that there is a wiring error. However, if the downstream current is equal to zero, at least one resistor needs to be connected in series at the upstream end of the current acquisition circuit, for example... Figure 3 or Figure 4 In the first resistor in the circuit, under normal circumstances, the first relay is in the normally open state. At this time, the first resistor is not connected in series at the front end of the current acquisition circuit. However, by controlling the first relay to close, the first resistor is equivalent to being connected in series at the front end of the current acquisition circuit.

[0110] Specifically, if at least one resistor is connected in series at the front end of the current acquisition circuit, and the back end current of the current acquisition circuit is still zero, it indicates that the energy meter is experiencing a current loss.

[0111] In some embodiments, Figure 5 A flowchart of the data inaccuracy detection method for an energy meter without a current transformer provided in this application embodiment is shown below. Figure 5 As shown, it includes the following steps:

[0112] S501, Check if meter reading data has been received;

[0113] S502, Detect the voltage at the back end of the voltage acquisition circuit for each phase;

[0114] S503. Determine whether the back-end voltage is greater than the first voltage threshold.

[0115] S504. When the back-end voltage is greater than the first voltage threshold, the energy meter does not lose voltage.

[0116] S505, Detects the back-end current of the current acquisition circuit for each phase;

[0117] S506. Determine if the back-end current is less than zero;

[0118] S507. The electricity meter is wired incorrectly when the downstream current is less than zero.

[0119] S508. When the back-end voltage is less than or equal to the first voltage threshold, the energy meter loses voltage.

[0120] S509. Determine if the back-end current is equal to zero;

[0121] S510, A first resistor is connected in series at the front end of the current acquisition circuit of the phase with zero back-end current;

[0122] S511. After connecting the first resistor, determine whether the current at the back end is still equal to zero.

[0123] S512, after the first resistor is connected in series, the current at the back end is still zero, and the energy meter loses current.

[0124] S513. After the first resistor is connected in series, the current at the back end is not equal to zero, and the energy meter does not lose current.

[0125] S514. Calculate the error rate of the metering chip;

[0126] S515. Determine whether the error rate is greater than the first error rate threshold.

[0127] S516. Measurement inaccuracy occurs when the error rate exceeds the first error rate threshold.

[0128] S517. Send abnormal data to the meter reading data inaccuracy verification terminal;

[0129] S518, Meter reading data inaccuracy verification terminal sends abnormal data to the main station system;

[0130] S519. The main station system sends a processing notification to the staff of the user's assigned area.

[0131] S520. When the error rate is less than or equal to the first error rate threshold, the electricity meter does not show any metering inaccuracy.

[0132] S521. The electricity meter sends accurate metering information to the meter reading data inaccuracy verification terminal.

[0133] S522, the meter reading data inaccuracy verification terminal sends metering accuracy information to the main station system.

[0134] In this embodiment, Figure 5 The test method shown can be applied to single-phase energy meters without matching current transformers and low-voltage three-phase energy meters without matching low-voltage current transformers (i.e., three-phase energy meters with three-phase four-wire connection).

[0135] First, when the electricity meter receives the meter reading data verification start signal, the electricity meter first performs a voltage loss test, detecting the voltage at the back end of the voltage acquisition circuit of each phase (for single-phase electricity meters, it detects the phase connected to the electricity meter; for three-phase electricity meters, it detects each of the three phases separately), and determines whether the back end voltage is greater than the first voltage threshold (e.g., 198 volts). If it is greater than 198 volts, it proves that the electricity meter device has not lost voltage; otherwise, it is determined that the electricity meter device has lost voltage.

[0136] Next, check the current at the back end of the current acquisition circuit for each phase of the electricity meter (for single-phase electricity meters, check the phase connected to the meter; for three-phase electricity meters, check each of the three phases separately). First, determine if the back end current is less than 0. If the back end current is less than 0, it can be determined that there is an error in the wiring of the electricity meter. If the back end current is greater than or equal to 0, then it is necessary to determine if the back end current is equal to 0.

[0137] If the downstream current is greater than 0, it indicates that the electricity meter is not experiencing a current loss. However, if the downstream current is equal to 0, the electricity meter may be experiencing a current loss, or the user may not be using electricity, requiring further investigation. For details, please refer to the above. Figure 2 or Figure 3 At this point, a first resistor can be connected in series at the front end of the current acquisition circuit of the phase with a back-end current of 0, and then it can be determined whether the back-end current is equal to 0. If the back-end current is still 0, it can be determined that the energy meter device is losing current. If the back-end current I is not 0, it can be determined that the energy meter device is not losing current, which means that the user side is not using electricity.

[0138] Then, the error rate Y of the metering chip is calculated using the voltage and current signals at the input terminal of the metering chip (i.e., the voltage and current signals acquired by the voltage acquisition circuit and the current acquisition circuit) and the active power at the output terminal.

[0139] In some embodiments, if the energy meter is a single-phase energy meter without a current transformer, the first formula for calculating the first error rate is as follows:

[0140]

[0141] In the above formula, Y1 is the metering error rate, P is the active power, U is the back-end voltage, and I is the back-end current. Power factor.

[0142] In other embodiments, if the energy meter is a three-phase energy meter with a three-phase four-wire connection without a current transformer, the second formula for calculating the first error rate is as follows:

[0143]

[0144] In the above formula, Y2 is the metering error rate, P represents the active power, U is the back-end voltage, and I is the back-end current. As for the power factor, A, B, and C are the three phases of the electricity meter.

[0145] In other embodiments, if the energy meter is a three-phase energy meter with an external combined current transformer, and its wiring method is three-phase three-wire connection, suitable for high-voltage metering turntable users, then the third formula for calculating the first error rate is:

[0146]

[0147] In the above formula, Y3 is the metering error rate, P represents the active power, A, B, and C are the three phases of the energy meter, U̇ represents the voltage phasor, and I is the line current value. Power factor.

[0148] In summary, if the first error rate, calculated using the first formula, second formula, or third formula, is greater than the first error rate threshold (e.g., 2%), then the electricity meter is determined to have inaccurate electricity consumption measurement. If the first error rate is not greater than the first error rate threshold, it indicates that the metering chip is within the allowable error range, and there is no inaccurate electricity consumption measurement.

[0149] Further, please refer to the above. Figure 5 If the meter reading data does not show any of the four conditions of voltage loss, current loss, wiring error, or metering chip inaccuracy after testing, the meter will send the user's meter reading error verification terminal with the information that the meter reading is correct. After receiving the feedback from the meter device, the meter reading error verification terminal will send the user's meter reading error verification terminal with the information that the meter reading is correct to the main station system.

[0150] If the meter reading data shows any of the following four conditions: voltage loss, current loss, wiring error, or metering chip malfunction, the meter will send an error message (indicating abnormal data) to the meter reading error verification terminal. This message will include the type of error and, for three-phase meters, the specific phase affected. Upon receiving the meter's feedback, the meter reading error verification terminal will send the abnormal data to the main station system. The main station system will then generate a corresponding meter reading error handling work order and send a notification (e.g., SMS) to the staff in the user's area. After on-site processing, the staff will archive the meter reading error handling work order.

[0151] Furthermore, in some embodiments, Figure 6 This is a flowchart of a method for detecting data inaccuracies in an energy meter with a low-voltage current transformer, as provided in an embodiment of this application. Figure 6 As shown, it includes the following steps:

[0152] S601. Check if meter reading data has been received;

[0153] S602, Detect the voltage at the back end of the voltage acquisition circuit for each phase;

[0154] S603. Determine whether the back-end voltage is greater than the first voltage threshold.

[0155] S604. When the back-end voltage is greater than the first voltage threshold, the energy meter does not lose voltage.

[0156] S605, Detect the back-end current of the current acquisition circuit for each phase;

[0157] S606. Determine if the back-end current is less than zero;

[0158] S607. The electricity meter is wired incorrectly when the downstream current is less than zero.

[0159] S608. When the back-end voltage is less than or equal to the first voltage threshold, the energy meter loses voltage.

[0160] S609. Determine if the back-end current is equal to zero;

[0161] S610, A first resistor is connected in series at the front end of the current acquisition circuit of the phase with zero back-end current;

[0162] S611. After connecting the first resistor, determine whether the current at the back end is still equal to zero.

[0163] S612. After the first resistor is connected in series, the current at the back end is still zero, and the energy meter loses current.

[0164] S613. After the first resistor is connected in series, the current at the back end is not equal to zero, and the energy meter does not lose current.

[0165] S614. Calculate the error rate of the metering chip;

[0166] S615. Determine whether the error rate is greater than the first error rate threshold.

[0167] S616. Measurement inaccuracy occurs when the error rate exceeds the first error rate threshold.

[0168] S617. Send abnormal data to the meter reading data inaccuracy verification terminal;

[0169] S618, Meter reading data inaccuracy verification terminal sends abnormal data to the main station system;

[0170] S619. The main station system sends a processing notification to the staff of the user's assigned area.

[0171] S620. When the error rate is less than or equal to the first error rate threshold, the electricity meter does not show any metering inaccuracy.

[0172] S621. Calculate the accuracy error rate G of the current transformer;

[0173] S622. Determine whether the accuracy error rate G is greater than the second error rate threshold.

[0174] S623. When the accuracy error rate G is less than or equal to the second error rate threshold, the accuracy of the current transformer is within the allowable range.

[0175] S624. The electricity meter sends metering accuracy information to the meter reading data inaccuracy verification terminal.

[0176] S625, the meter reading data inaccuracy verification terminal sends metering accuracy information to the main station system.

[0177] In this embodiment, Figure 6The method for detecting data inaccuracies in energy meters equipped with low-voltage current transformers is applicable to three-phase energy meters with low-voltage current transformers. The wiring method is as follows: the voltage input is a low-voltage three-phase four-wire connection, the current input is the secondary output connected to the current transformer, and the voltage input is the primary input not connected to the current transformer. The user types include three-phase energy meters with an installed capacity of 50kW and above, as well as dedicated users with high-voltage supply and low-voltage metering.

[0178] In addition, the method for detecting inaccurate data in electricity meters with current transformers is similar to the above in detecting four types of inaccurate meter reading data: undervoltage, undercurrent, wiring errors, and metering chip malfunction. Figure 5 The testing methods for non-matching current transformers are the same and will not be repeated here.

[0179] Among them, referring to the above Figure 4 The hardware schematic diagram of an energy meter with a current transformer includes a third relay and a test transformer. The third relay is normally open and is activated when needed. Figure 6 In step S621, when calculating the current transformer accuracy error rate G, the third relay can be controlled to close. At this time, the secondary current value after the current in the voltage input line is transformed by the test transformer can be collected, and then the current transformer error rate G can be calculated based on the following fourth formula:

[0180]

[0181] In the above formula, A, B, and C are the three phases of the energy meter, G is the error rate of the current transformer, I1 represents the secondary current value after the current in the voltage input line is transformed by the test transformer, I0 represents the current value of the current input line in the same phase as the voltage input line, and the transformation ratio of the test transformer is the same as the rated transformation ratio of the current transformer.

[0182] Specifically, when the error rate G of the current transformer is not greater than the second error rate threshold (e.g., 2%), it proves that the accuracy of the current transformer in that phase is normal. If the error rate G of the current transformer is greater than 2%, it proves that the accuracy of the current transformer in that phase is inaccurate.

[0183] In this embodiment, Figure 6 The data exchange, notification, and work order creation between the remaining electricity meters and the meter reading data inaccuracy inspection terminal and the main station system are similar to the inspection method for mismatched current transformers, and will not be elaborated here.

[0184] Furthermore, in some embodiments, Figure 7 This is a flowchart of a method for detecting data inaccuracies in energy meters with combined current transformers provided in an embodiment of this application. Figure 7 As shown, it includes the following steps:

[0185] S701, Check if meter reading data has been received;

[0186] S702, Detects the voltage at the back end of the voltage acquisition circuit for each phase;

[0187] S703. Determine whether the back-end voltage is greater than the first voltage threshold.

[0188] S704. The energy meter does not lose voltage when the back-end voltage is greater than the first voltage threshold.

[0189] S705, Detects the back-end current of the current acquisition circuit for each phase;

[0190] S706. Determine if the back-end current is less than zero;

[0191] S707. The electricity meter is wired incorrectly when the downstream current is less than zero.

[0192] S708. When the back-end voltage is less than or equal to the second voltage threshold, the energy meter loses voltage.

[0193] S709. Determine if the back-end current is equal to zero;

[0194] S710, A first resistor is connected in series at the front end of the current acquisition circuit of the phase with zero back-end current;

[0195] S711. After connecting the first resistor, determine whether the current at the back end is still equal to zero.

[0196] S712, after the first resistor is connected in series, the current at the back end is still zero, and the energy meter loses current.

[0197] S713: After the first resistor is connected in series, the current at the back end is not equal to zero, and the energy meter does not lose current.

[0198] S714, Calculate the error rate of the metering chip;

[0199] S715. Determine whether the error rate is greater than the first error rate threshold.

[0200] S716. Measurement inaccuracy occurs when the error rate exceeds the first error rate threshold.

[0201] S717. Send abnormal data to the meter reading data inaccuracy verification terminal;

[0202] S718, Meter reading data inaccuracy verification terminal sends abnormal data to the main station system;

[0203] S719. The main station system sends a processing notification to the staff of the user's assigned area.

[0204] S720. When the error rate is less than or equal to the first error rate threshold, the electricity meter does not show measurement inaccuracy.

[0205] S721. Calculate the accuracy error rate G of the current transformer;

[0206] S722. Determine whether the accuracy error rate G is greater than the second error rate threshold.

[0207] S723. When the accuracy error rate G is less than or equal to the second error rate threshold, the accuracy of the current transformer is within the allowable range.

[0208] S724. The electricity meter sends metering accuracy information to the meter reading data inaccuracy verification terminal.

[0209] S725, the meter reading data inaccuracy verification terminal sends metering accuracy information to the main station system.

[0210] In this embodiment, the testing method for the matching combined instrument transformer is basically the same as that for the matching low-voltage current transformer. The similarities will not be elaborated further. The differences are as follows:

[0211] (1) The test method of the matching combined instrument transformer is applicable to the dedicated users of high-voltage power supply and high-voltage meter. The matching energy meter is a three-phase three-wire connection method. The voltage input and current input of the energy meter are connected to the secondary output after being transformed by the combined instrument transformer. The energy meter used by the dedicated users of high-voltage power supply and high-voltage meter has a second voltage threshold for undervoltage detection, such as 99 volts.

[0212] (2) When the metering chip is detected to be inaccurate, the third formula mentioned above is used to calculate the first error rate of the electricity meter used by the dedicated user of the high-power meter.

[0213] (3) When testing the transformation accuracy of the combined instrument transformer, since the voltage input line of the electricity meter used by the dedicated user in the high-voltage power supply and metering system is also a secondary input line, once the electricity meter detects a voltage loss, it includes the situation of the voltage coil transformation of the combined instrument transformer being inaccurate. Therefore, it is only necessary to test the metering accuracy of the current coil of the combined instrument transformer. The current coil of the combined instrument transformer transforms the AB line current and the CB line current. The current value measured by the current input line is the secondary current value of the AB line current and the CB line current. Therefore, the calculation formula for the error rate G of the combined instrument transformer is as follows:

[0214]

[0215] In the above formula, A, B, and C represent the three phases of the electricity meter, G represents the error rate of the combined current transformer, and AB and CB represent the line values. The subscript 1 indicates the secondary current after the voltage input current flows through the test transformer and is transformed. The subscript 0 indicates the current input current. The transformation ratio of the test transformer is the same as the rated transformation ratio of the combined transformer.

[0216] Apart from the three differences mentioned above, the testing methods for the matching combined instrument transformers are similar to the other two methods in terms of data exchange, notification, and work order establishment between the electricity meter and the meter reading data inaccuracy testing terminal and the main station system, so they will not be elaborated here.

[0217] This application also provides an electricity meter that can serve as the execution subject of the above-described method. Specifically, the electricity meter may include a memory and a processor (such as the microcomputer module described above). The memory stores computer execution instructions, and the processor executes the computer execution instructions stored in the memory, causing the processor to perform the method as described above.

[0218] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0219] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A method for detecting inaccurate data in an electricity meter, characterized in that, include: In response to receiving a meter reading data verification start signal, the back-end voltage of the voltage acquisition circuit of each phase of the energy meter, the back-end current of the current acquisition circuit of each phase, and the active power output by the metering chip in the energy meter are acquired. The active power is determined by the metering chip based on the back-end voltage and the back-end current. Based on the back-end voltage, back-end current, and active power, determine whether the energy meter is in any abnormal condition. The abnormal condition includes at least one of the following: current loss, voltage loss, wiring error, and inaccurate electricity consumption measurement. In the event of an abnormality in the electricity meter, the abnormal data is reported to the meter reading data inaccuracy verification terminal.

2. The method according to claim 1, characterized in that, Determining whether the electricity meter is experiencing a voltage loss includes: When the energy meter is a single-phase energy meter or a three-phase energy meter with three-phase four-wire connection, and the voltage at the back end is less than the first voltage threshold, it is determined that the energy meter is undervoltage. When the energy meter is a three-phase energy meter with three-phase three-wire connection, and the voltage at the back end is less than the second voltage threshold, it is determined that the energy meter has a voltage loss, and the first voltage threshold is greater than the second voltage threshold.

3. The method according to claim 1, characterized in that, Determining whether the electricity meter has current loss and wiring errors includes: If the back-end current is less than zero, it is determined that there is a wiring error in the energy meter; When the back-end current is equal to zero, control the current acquisition circuit to connect at least one resistor in series at the front end; Reacquire the back-end current of the current acquisition circuit after at least one resistor is connected in series at the front end; If the current at the back end of the current acquisition circuit after at least one resistor is connected in series at the front end is equal to zero, it is determined that the energy meter is experiencing current loss.

4. The method according to claim 1, characterized in that, Determining whether the electricity meter has inaccurate electricity consumption measurement includes: When the energy meter is a single-phase energy meter, the first error rate is determined according to the first formula, the back-end voltage, the back-end current, and the active power; In the case of a three-phase energy meter with a three-phase four-wire connection, the second error rate is determined based on the second formula, the back-end voltage, the back-end current, and the active power. In the case of a three-phase energy meter with a three-phase three-wire connection, the third error rate is determined based on the third formula, the back-end voltage, the back-end current, and the active power. If any one of the first error rate, the second error rate, and the third error rate is greater than the first error rate threshold, it is determined that the electricity meter has an inaccurate electricity consumption measurement.

5. The method according to claim 4, characterized in that, The first formula is: In the above formula, Y1 is the metering error rate, P is the active power, U is the back-end voltage, and I is the back-end current. Power factor.

6. The method according to claim 4, characterized in that, The second formula is: In the above formula, Y2 is the metering error rate, P represents the active power, U is the back-end voltage, and I is the back-end current. As for the power factor, A, B, and C are the three phases of the electricity meter.

7. The method according to claim 4, characterized in that, The third formula is: In the above formula, Y3 is the metering error rate, P represents the active power, A, B, and C are the three phases of the energy meter, U̇ represents the voltage phasor, and I is the line current value. Power factor.

8. The method according to claim 1, characterized in that, The energy meter is a three-phase energy meter with a three-phase four-wire connection. Each phase of the energy meter includes a voltage input line and a current input line. The current input line is the secondary output line connected to a current transformer, and the voltage input line is the primary input line not connected to the current transformer. The method further includes: The error rate of the current transformer is determined according to the fourth formula; If the error rate of the current transformer is greater than the second error rate threshold, it is determined that the current transformer has an abnormal situation of inaccurate transformation. The fourth formula is: In the above formula, A, B, and C are the three phases of the energy meter, G is the error rate of the current transformer, I1 represents the secondary current value after the current in the voltage input line is transformed by the test transformer, I0 represents the current value of the current input line in the same phase as the voltage input line, and the transformation ratio of the test transformer is the same as the rated transformation ratio of the current transformer.

9. The method according to claim 1, characterized in that, The energy meter is a three-phase energy meter with a three-phase three-wire connection. Each phase of the energy meter includes a voltage input line and a current input line, and both the voltage input line and the current input line are connected to the secondary output lines of a combined current transformer. The method further includes: Determine the error rate of the combined current transformer according to the fifth formula; If the error rate of the combined current transformer is greater than the second error rate threshold, it is determined that the combined current transformer has an abnormal situation of inaccurate transformation. The fifth formula is: In the above formula, A, B, and C represent the three phases of the electricity meter, G represents the error rate of the combined current transformer, and AB and CB represent the line values. The subscript 1 indicates the secondary current after the voltage input current flows through the test transformer and is transformed, and the subscript 0 indicates the current input current. The transformation ratio of the test transformer is the same as the rated transformation ratio of the combined transformer.

10. An electricity meter, characterized in that, include: Memory, processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory, causing the processor to perform the method as described in any one of claims 1-9.

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