Electric energy acquisition and on-line metering method in electric energy meter replacement process

Abstract

The invention relates to the technical field of electric energy acquisition and metering, and discloses an electric energy acquisition and on-line metering method in an electric energy meter replacement process, which comprises the following steps of: when an electric meter is disassembled and assembled, keeping a connection state of an old electric meter, connecting a voltage terminal and a current terminal of a new meter to a voltage circuit and a current circuit of the old electric meter in parallel, when the control switch of the new meter is not turned on, the current loop is in a shunt state, a part of current flows through the old meter and a part of current flows through the new meter, and when the control switch of the old meter is turned on, all current in the current loop flows through the new meter; when the control switch of the new meter is switched off, the new meter is switched off, all current in the current loop flows through the old meter, the old meter is switched off, and the new meter is taken down. According to the invention, the new and old electricity meters are connected in parallel, so that the continuity of current is maintained in the replacement process, seamless collection of electric energy is ensured, and the efficiency and accuracy of electricity meter replacement are improved. And an electric quantity conversion device.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy collection and metering, and in particular to an electric energy collection and online metering method during replacement of an electric energy meter. Background Art

[0002] With the continuous development of the power system, energy metering technology has become an important part of ensuring power supply and optimizing resource allocation. Accurate energy metering is not only related to the economic interests of power companies, but also affects the user's electricity experience. Therefore, improving the replacement and online metering efficiency of energy meters has become an important research direction in the industry.

[0003] In the traditional process of replacing an electric energy meter, it is usually necessary to first disconnect the power supply of the old meter, disassemble it, and then install the new meter. This process often involves multiple power switching and manual intervention. The measurement of electric energy mainly relies on the manual entry of static measurement equipment after replacement, and lacks the ability to monitor in real time. In this process, power companies usually use manual methods to calculate and record electric energy, relying on the experience of technicians to operate.

[0004] Traditional technologies have multiple defects, mainly manifested in the lack of continuity of energy metering and inefficient operation. During the replacement process, the power supply is cut off, resulting in interruption of energy metering, and it is impossible to accurately track the energy consumption during the meter replacement. In addition, manual operation is prone to human errors, resulting in inaccurate metering data, which affects subsequent power management and user experience. These shortcomings urgently require a more efficient and accurate method for replacing and online metering of energy meters. Summary of the invention

[0005] The present invention mainly solves the technical problems existing in the above-mentioned prior art and provides an electric energy collection and online metering method during the replacement of an electric energy meter.

[0006] In order to achieve the above object, the present invention adopts the following technical solution, a method for collecting and online measuring electric energy during the replacement of electric energy meters, comprising the following steps:

[0007] (1) When disassembling and installing an electric meter, keep the old electric meter connected, connect the input current terminal of the electric quantity conversion device to the old meter, connect the output current terminal of the electric quantity conversion device to the new meter, and connect the voltage and current terminals of the new meter in parallel to the voltage and current loop of the old meter. When the control switch of the new meter is not turned on, the current loop is in a shunt state, and part of the current flows through the old meter, and part of the current flows through the new meter. When the control switch of the old meter is turned on, all the current in the current loop flows through the new meter; when the control switch of the new meter is turned off, disconnect the new meter, at this time all the current in the current loop flows through the old meter, disconnect the old meter, and remove the new meter; after the control switch of the new meter is turned off, turn on the control switch of the new meter, and then install the new meter to the original position of the old meter. The current loop is in a shunt state, and part of the current flows through the old meter, and part of the current flows through the new meter. When the control switch of the old meter is turned on, all the current in the current loop flows through the old meter. Disconnect the old meter, remove the old meter, and disconnect the control switch of the new meter. The replacement of the electric meter is completed;

[0008] (2) The voltage terminals of the new meter and the old meter are connected in parallel to the main voltage terminal and the voltage terminal, respectively, and the current terminals of the new meter and the old meter are connected in parallel to the current terminal and the current terminal, respectively. The voltage terminals are short-circuited, and the current terminals are short-circuited. During installation, the metering part of the new meter is connected to the circuit of the electric energy meter. The old meter and the new meter are turned on. When the control switch of the new meter is not turned on, the current circuit is in a shunt state, and part of the current flows through the old meter and part of the current flows through the new meter. After the old meter and the new meter are turned off, the control switch of the new meter is disconnected, the new meter is removed, and the new meter is installed in the original position of the old meter. At this time, the new meter and the old meter are both turned on, and the current circuit is in a parallel state. The current flows through the new meter and the old meter. By collecting the electric energy of the new meter and the old meter, and determining the shunt current according to the parallel current in the circuit of the electric energy meter, the electric energy of the new meter is accumulated. When the control switch of the old meter is disconnected, the old meter is disconnected and removed. After the control switch of the new meter is disconnected, the replacement of the electric meter is completed;

[0009] (3) Turn on the control switch of the old meter on the panel of the device to make it in the on state. At this time, the current loop is in the shunting state, with part of the current flowing through the old meter and part of the current flowing through the new meter;

[0010] (4) An electric energy metering module with real-time metering function is used. By multiplying the sampled voltage and current signals, a DC signal proportional to the average power over a period of time is output. The output frequency signal is divided by a voltage / frequency converter, and the divided signal is multiplied within the required time range to complete the electric energy metering. Finally, the accumulated electricity within the required time is displayed on the LCD screen. After the new meter is installed, the electricity conversion device is removed.

[0011] Preferably, the energy meter for collecting the residual electric energy of the new meter and the old meter in parallel has the voltage terminals of the new meter and the old meter arranged in parallel on the voltage terminals and the voltage terminals, and the current terminals of the new meter and the old meter arranged in parallel on the current terminals and the current terminals, the voltage terminals and the voltage terminals are short-circuited, the current terminals and the current terminals are short-circuited, the new meter is provided with a main current switch, during installation, the current collection end of the new meter is connected to the energy meter circuit, when the main current switch of the new meter is not turned on, the current circuit is in a shunt state, part of the current flows through the old meter, and part of the current flows through the new meter, by collecting the electric energy of the new meter and the old meter, and determining the shunt current according to the parallel current in the energy meter circuit, the electric energy of the new meter is accumulated, When the main current switch of the old meter is turned on, disconnect the old meter. When the main current switch of the new meter is turned off, remove the new meter and install the new meter in the original position of the old meter. At this time, both the new meter and the old meter are turned on, and the current circuit is in a parallel state. The current flows through the new meter and the old meter. When the main current switch of the new meter is not turned on, the current circuit is in a shunt state. When part of the current flows through the old meter and part of the current flows through the new meter, the electric energy of the new meter and the old meter is collected, and the shunt current is determined according to the parallel current in the electric energy meter circuit, so as to accumulate the electric energy of the new meter. When the main current switch of the old meter is not turned off, disconnect the old meter, turn on the main current switch of the old meter, remove the new meter, and after the main current switch of the new meter is turned off, the meter replacement is completed.

[0012] Preferably, the electric energy metering module includes an electric energy meter, a voltage acquisition unit acquires the voltage value of the electric energy meter, a current acquisition unit acquires the current value of the electric energy meter, the voltage value and the current value of the electric energy meter are multiplied in a multiplication unit to generate an electric product signal, the electric product signal generates a corresponding frequency signal through a frequency generation unit, and the frequency conversion unit converts the frequency signal into a digital signal and outputs the measured signal.

[0013] Preferably, the electric energy metering module includes an electric energy meter, a current acquisition and storage unit acquires the current value of the electric energy meter and stores the current value in a memory, a voltage acquisition and storage unit acquires the voltage value of the electric energy meter and stores the voltage value in a memory, a time acquisition and storage unit acquires the duration data of the electric energy meter and stores it in a memory, an electric energy calculation unit calculates electric energy by a formula based on the voltage value, current value and duration in the memory, and outputs the calculation result in the form of a signal.

[0014] Preferably, the electric energy meter controls the current acquisition storage unit to obtain the current value of the electric energy meter according to the electric energy calculation result, and at the same time, controls the voltage acquisition storage unit to acquire the voltage value of the electric energy meter, and controls the time acquisition storage unit to acquire the duration data of the electric energy meter, and stores the current value, voltage value and duration data in the memory respectively. The electric energy calculation unit calculates the electric energy through a formula according to the current value, voltage value and duration in the memory, and outputs the measured value to the LCD screen.

[0015] Preferably, after the replacement of the electric energy meter is completed, the voltage terminals and current terminals of the new meter are short-circuited with those of the original meter, and the working current of the new meter is superimposed with the residual operating current of the old meter, so as to calculate the electric energy consumed during the meter replacement. Based on the electric energy consumed during the meter replacement, the new meter is compensated for the electric energy to ensure the continuity of the electric energy measured by the electric energy meter.

[0016] Preferably, the current and voltage are connected in parallel, that is, the current value collected by the current collection unit includes the current value from the current terminal through the current terminal and the current value from the current terminal to the current terminal.

[0017] Preferably, the measuring circuit, under the control of the control circuit, collects the current signal for meter-changing measurement or conventional measurement.

[0018] Preferably, the electric energy metering module integrates the collected current and voltage data and obtains the square of the electric energy data by multiplying the square of the voltage by the square of the current and then by the time, and performs a square root operation on the square of the electric energy data to obtain the electric energy data.

[0019] Beneficial Effects

[0020] The present invention provides a method for collecting and online measuring electric energy during the replacement of electric energy meters. It has the following beneficial effects:

[0021] (1) The method for collecting and online measuring electric energy during the process of replacing an electric energy meter connects the old and new electric meters in parallel to maintain the continuity of the current during the replacement process, ensuring seamless collection of electric energy, thereby improving the efficiency and accuracy of the electric energy meter replacement. By adopting a high-precision electric energy metering module, an instant metering function is realized, achieving the effect of real-time monitoring of electric energy consumption and fault detection, thereby improving the operational safety of the system.

[0022] (2) The method for collecting and online measuring electric energy during the process of replacing electric energy meters can achieve the effect of accurately catching up with the electric energy consumed during the replacement of electric energy meters by short-circuiting the voltage and current terminals of the old and new electric energy meters, thereby ensuring the continuity and accuracy of the metering data of the new meter and avoiding data loss. By integrating the collected voltage and current data and using advanced algorithms for electric energy calculation, the reliability and accuracy of the metering results can be improved, thus providing a more solid data foundation for power management. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the implementation of the present invention or the technical solution in the prior art, the following briefly introduces the drawings required for the implementation or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0024] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0025] Figure 1 The electrical diagram of the present invention

[0026] Figure 2 is a system architecture diagram of the present invention;

[0027] Figure 3 is a flow chart of the present invention;

[0028] Figure 4 It is a circuit connection schematic diagram of the present invention;

[0029] Figure 5 This is a structural diagram of the electric energy metering module of the present invention;

[0030] Figure 6 It is the hardware principle diagram of the present invention. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the 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.

[0032] Embodiment: A method for collecting and online measuring electric energy during replacement of electric energy meters, such as Figures 1 to 6 As shown, the following steps are included:

[0033] (1) When disassembling and installing an electric meter, keep the old electric meter connected, connect the input current terminal of the electric quantity conversion device to the old meter, connect the output current terminal of the electric quantity conversion device to the new meter, and connect the voltage and current terminals of the new meter in parallel to the voltage and current loop of the old meter. When the control switch of the new meter is not turned on, the current loop is in a shunt state, and part of the current flows through the old meter, and part of the current flows through the new meter. When the control switch of the old meter is turned on, all the current in the current loop flows through the new meter; when the control switch of the new meter is turned off, disconnect the new meter, at this time all the current in the current loop flows through the old meter, disconnect the old meter, and remove the new meter; after the control switch of the new meter is turned off, turn on the control switch of the new meter, and then install the new meter to the original position of the old meter. The current loop is in a shunt state, and part of the current flows through the old meter, and part of the current flows through the new meter. When the control switch of the old meter is turned on, all the current in the current loop flows through the old meter. Disconnect the old meter, remove the old meter, and disconnect the control switch of the new meter. The replacement of the electric meter is completed;

[0034] (2) The voltage terminals of the new meter and the old meter are connected in parallel to the main voltage terminal and the voltage terminal, respectively, and the current terminals of the new meter and the old meter are connected in parallel to the current terminal and the current terminal, respectively. The voltage terminals are short-circuited, and the current terminals are short-circuited. During installation, the metering part of the new meter is connected to the circuit of the electric energy meter. The old meter and the new meter are turned on. When the control switch of the new meter is not turned on, the current circuit is in a shunt state, and part of the current flows through the old meter and part of the current flows through the new meter. After the old meter and the new meter are turned off, the control switch of the new meter is disconnected, the new meter is removed, and the new meter is installed in the original position of the old meter. At this time, the new meter and the old meter are both turned on, and the current circuit is in a parallel state. The current flows through the new meter and the old meter. By collecting the electric energy of the new meter and the old meter, and determining the shunt current according to the parallel current in the circuit of the electric energy meter, the electric energy of the new meter is accumulated. When the control switch of the old meter is disconnected, the old meter is disconnected and removed. After the control switch of the new meter is disconnected, the replacement of the electric meter is completed;

[0035] (3) Turn on the control switch of the old meter on the panel of the device to make it in the on state. At this time, the current loop is in the shunting state, with part of the current flowing through the old meter and part of the current flowing through the new meter;

[0036] (4) An electric energy metering module with real-time metering function is used. By multiplying the sampled voltage and current signals, a DC signal proportional to the average power over a period of time is output. The output frequency signal is divided by a voltage / frequency converter, and the divided signal is multiplied within the required time range to complete the electric energy metering. Finally, the accumulated electricity within the required time is displayed on the LCD screen. After the new meter is installed, the electricity conversion device is removed.

[0037] Furthermore, in the electric energy meter for collecting the residual electric energy of the new meter and the old meter in parallel, the voltage terminals of the new meter and the old meter are arranged in parallel on the voltage terminals and the voltage terminals, and the current terminals of the new meter and the old meter are arranged in parallel on the current terminals and the current terminals, the voltage terminals and the voltage terminals are short-circuited, the current terminals and the current terminals are short-circuited, and the new meter is provided with a main current switch. During installation, the current collection end of the new meter is connected to the electric energy meter circuit. When the main current switch of the new meter is not turned on, the current circuit is in a shunt state, and part of the current flows through the old meter and part of the current flows through the new meter. By collecting the electric energy of the new meter and the old meter, and determining the shunt current according to the parallel current in the electric energy meter circuit, the electric energy of the new meter is accumulated. When the main current switch of the old meter is turned on, disconnect the old meter. When the main current switch of the new meter is turned off, remove the new meter and install the new meter in the original position of the old meter. At this time, both the new meter and the old meter are turned on, and the current circuit is in a parallel state. The current flows through the new meter and the old meter. When the main current switch of the new meter is not turned on, the current circuit is in a shunt state. When part of the current flows through the old meter and part of the current flows through the new meter, the electric energy of the new meter and the old meter is collected, and the shunt current is determined according to the parallel current in the electric energy meter circuit, so as to accumulate the electric energy of the new meter. When the main current switch of the old meter is not turned off, disconnect the old meter, turn on the main current switch of the old meter, remove the new meter, and after the main current switch of the new meter is turned off, the meter replacement is completed.

[0038] Furthermore, the electric energy metering module includes an electric energy meter, a voltage acquisition unit acquires the voltage value of the electric energy meter, a current acquisition unit acquires the current value of the electric energy meter, the voltage value and the current value of the electric energy meter are multiplied in the multiplication unit to generate an electric quantity product signal, the electric quantity product signal generates a corresponding frequency signal through the frequency generation unit, the frequency conversion unit converts the frequency signal into a digital signal, and measures the output.

[0039] Furthermore, the electric energy metering module includes an electric energy meter, a current acquisition and storage unit acquires the current value of the electric energy meter and stores the current value in a memory, a voltage acquisition and storage unit acquires the voltage value of the electric energy meter and stores the voltage value in a memory, a time acquisition and storage unit acquires the duration data of the electric energy meter and stores it in a memory, an electric energy calculation unit calculates electric energy using a formula based on the voltage value, current value and duration in the memory, and outputs the calculation result in the form of a signal.

[0040] Furthermore, the electric energy meter controls the current acquisition storage unit to obtain the current value of the electric energy meter according to the electric energy calculation result, and at the same time, controls the voltage acquisition storage unit to acquire the voltage value of the electric energy meter, and controls the time acquisition storage unit to acquire the duration data of the electric energy meter, and stores the current value, voltage value and duration data in the memory respectively. The electric energy calculation unit calculates the electric energy through a formula according to the current value, voltage value and duration in the memory, and outputs the measured energy to the LCD screen.

[0041] Furthermore, after the replacement of the electric energy meter is completed, the voltage terminals and current terminals of the new meter are short-circuited with the original electric energy meter, and the working current of the new meter is superimposed with the residual operating current of the old meter, so as to calculate the electric energy consumed during the meter replacement. According to the electric energy consumed during the meter replacement, the new meter is compensated for the electric energy to ensure the continuity of the electric energy measured by the electric energy meter.

[0042] Furthermore, the current and voltage are connected in parallel, that is, the current value collected by the current collection unit includes the current value from the current terminal through the current terminal and the current value from the current terminal to the current terminal.

[0043] Furthermore, under the control of the control circuit, the measuring circuit collects the current signal for meter-changing measurement or conventional measurement.

[0044] Furthermore, the electric energy metering module integrates the collected current and voltage data and obtains the square of the electric energy data by multiplying the square of the voltage by the square of the current and then by the time, and performs a square root operation on the square of the electric energy data to obtain the electric energy data.

[0045] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for collecting and online measuring electric energy during the replacement of electric energy meters, characterized in that: The following steps are involved: (1) When disassembling and installing an electric meter, keep the old electric meter connected, connect the input current terminal of the electric quantity conversion device to the old meter, connect the output current terminal of the electric quantity conversion device to the new meter, and connect the voltage and current terminals of the new meter in parallel to the voltage and current loop of the old meter. When the control switch of the new meter is not turned on, the current loop is in a shunt state, and part of the current flows through the old meter, and part of the current flows through the new meter. When the control switch of the old meter is turned on, all the current in the current loop flows through the new meter; when the control switch of the new meter is turned off, disconnect the new meter, at this time all the current in the current loop flows through the old meter, disconnect the old meter, and remove the new meter; after the control switch of the new meter is turned off, turn on the control switch of the new meter, and then install the new meter to the original position of the old meter. The current loop is in a shunt state, and part of the current flows through the old meter, and part of the current flows through the new meter. When the control switch of the old meter is turned on, all the current in the current loop flows through the old meter. Disconnect the old meter, remove the old meter, and disconnect the control switch of the new meter. The replacement of the electric meter is completed; (2) The voltage terminals of the new meter and the old meter are connected in parallel to the main voltage terminal and the voltage terminal, respectively, and the current terminals of the new meter and the old meter are connected in parallel to the current terminal and the current terminal, respectively. The voltage terminals are short-circuited, and the current terminals are short-circuited. During installation, the metering part of the new meter is connected to the circuit of the electric energy meter. The old meter and the new meter are turned on. When the control switch of the new meter is not turned on, the current circuit is in a shunt state, and part of the current flows through the old meter and part of the current flows through the new meter. After the old meter and the new meter are turned off, the control switch of the new meter is disconnected, the new meter is removed, and the new meter is installed in the original position of the old meter. At this time, the new meter and the old meter are both turned on, and the current circuit is in a parallel state. The current flows through the new meter and the old meter. By collecting the electric energy of the new meter and the old meter, and determining the shunt current according to the parallel current in the circuit of the electric energy meter, the electric energy of the new meter is accumulated. When the control switch of the old meter is disconnected, the old meter is disconnected and removed. After the control switch of the new meter is disconnected, the replacement of the electric meter is completed; (3) Turn on the control switch of the old meter on the panel of the device to make it in the on state. At this time, the current loop is in the shunting state, with part of the current flowing through the old meter and part of the current flowing through the new meter; (4) An electric energy metering module with real-time metering function is used. By multiplying the sampled voltage and current signals, a DC signal proportional to the average power over a period of time is output. The output frequency signal is divided by a voltage / frequency converter, and the divided signal is multiplied within the required time range to complete the electric energy metering. Finally, the accumulated electricity within the required time is displayed on the LCD screen. After the new meter is installed, the electricity conversion device is removed.

2. The method for collecting and online measuring electric energy during replacement of electric energy meters according to claim 1 is characterized in that: The electric energy meter for collecting the residual electric energy of the new meter and the old meter in parallel has the voltage terminals of the new meter and the old meter arranged in parallel on the voltage terminals and the voltage terminals, and the current terminals of the new meter and the old meter arranged in parallel on the current terminals and the current terminals, the voltage terminals and the voltage terminals are short-circuited, the current terminals and the current terminals are short-circuited, the new meter is provided with a main current switch, during installation, the current collection end of the new meter is connected to the electric energy meter circuit, when the main current switch of the new meter is not turned on, the current circuit is in a shunt state, part of the current flows through the old meter, and part of the current flows through the new meter, by collecting the electric energy of the new meter and the old meter, and determining the shunt current according to the parallel current in the electric energy meter circuit, the electric energy of the new meter is accumulated, and the electric energy of the old meter is accumulated. When the main current switch of the new meter is turned on, disconnect the old meter; when the main current switch of the new meter is turned off, remove the new meter and install the new meter in the original position of the old meter. At this time, both the new meter and the old meter are turned on, and the current circuit is in a parallel state. The current flows through the new meter and the old meter. When the main current switch of the new meter is not turned on, the current circuit is in a shunt state. Part of the current flows through the old meter and part of the current flows through the new meter. By collecting the electric energy of the new meter and the old meter, and determining the shunt current according to the parallel current in the electric energy meter circuit, the electric energy of the new meter is accumulated. When the main current switch of the old meter is not turned off, disconnect the old meter, turn on the main current switch of the old meter, remove the new meter, and after the main current switch of the new meter is turned off, the meter replacement is completed.

3. The method for collecting and online measuring electric energy during replacement of electric energy meters according to claim 1 is characterized in that: The electric energy metering module includes an electric energy meter, a voltage acquisition unit that acquires the voltage value of the electric energy meter, a current acquisition unit that acquires the current value of the electric energy meter, and a multiplication unit that multiplies the voltage value and the current value of the electric energy meter to generate an electric quantity product signal. The electric quantity product signal generates a corresponding frequency signal through a frequency generation unit, and a frequency conversion unit converts the frequency signal into a digital signal and outputs the measured signal.

4. The method for collecting and online measuring electric energy during replacement of electric energy meters according to claim 1 is characterized in that: The electric energy metering module includes an electric energy meter, a current acquisition storage unit that acquires the current value of the electric energy meter and stores the current value in a memory, a voltage acquisition storage unit that acquires the voltage value of the electric energy meter and stores the voltage value in a memory, a time acquisition storage unit that acquires the duration data of the electric energy meter and stores it in a memory, and an electric energy calculation unit that calculates electric energy using a formula based on the voltage value, current value and duration in the memory, and outputs the calculation result in the form of a signal.

5. The method for collecting and online measuring electric energy during replacement of electric energy meters according to claim 1 is characterized in that: The electric energy meter controls the current acquisition storage unit to obtain the current value of the electric energy meter according to the electric energy calculation result. At the same time, it controls the voltage acquisition storage unit to acquire the voltage value of the electric energy meter, and controls the time acquisition storage unit to acquire the duration data of the electric energy meter, and stores the current value, voltage value and duration data in the memory respectively. The electric energy calculation unit calculates the electric energy through a formula according to the current value, voltage value and duration in the memory, and outputs the measurement to the LCD screen.

6. The method for collecting and online measuring electric energy during replacement of electric energy meters according to claim 1 is characterized in that: After the replacement of the electric energy meter is completed, the voltage terminals and current terminals of the new meter are short-circuited with the original electric energy meter, and the working current of the new meter is superimposed with the residual operating current of the old meter, so as to calculate the electric energy consumed during the meter replacement. According to the electric energy consumed during the meter replacement, the new meter is compensated for the electric energy to ensure the continuity of the electric energy meter's metered electricity.

7. The method for collecting and online measuring electric energy during replacement of electric energy meters according to claim 1, characterized in that: The current and voltage are connected in parallel, that is, the current value collected by the current collection unit includes the current value from the current terminal through the current terminal and the current value from the current terminal to the current terminal.

8. The method for collecting and online measuring electric energy during replacement of electric energy meters according to claim 1 is characterized in that: The measuring circuit, under the control of the control circuit, collects the current signal for meter-changing measurement or conventional measurement.

9. The method for collecting and online measuring electric energy during replacement of electric energy meters according to claim 1, characterized in that: The electric energy metering module integrates the collected current and voltage data and obtains the square of the electric energy data by multiplying the square of the voltage by the square of the current and then by the time, and performs a square root operation on the square of the electric energy data to obtain the electric energy data.

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