Three-phase alternating current electric meter based on built-in three-in-one mutual inductor

Abstract

The utility model discloses a three-phase AC ammeter based on a built-in three-in-one mutual inductor, comprising a master control MCU, an auxiliary power supply module, a three-in-one mutual inductor, a current sampling module, a voltage sampling module and a metering chip, the input end of the auxiliary power supply module is connected with an external power supply through a terminal LN; the first output end of the auxiliary power supply module is electrically connected with the master control MCU and the metering chip, and the master control MCU is electrically connected with the metering chip. According to the three-phase alternating current electric meter based on the built-in three-in-one mutual inductor, a plurality of single mutual inductors are integrally designed, so that the structure and the performance of the electric meter are optimized, and meanwhile, the requirements of the electric meter on basic functions such as display, communication, metering, pulse output and the like are met; the actual use experience of customers of the mutual inductance type electric energy meter is greatly improved, and the requirements of a modernized electric power system for space and equipment configuration are met.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of electric meter, concretely relates to a three -phase alternating -current meter based on built -in three -in -one mutual inductor. BACKGROUND

[0002] Electric energy meter is used for the equipment of the metering electric energy consumption, and its anti -interference and accuracy are important to electric power operator and user. The traditional three -phase mutual inductor type alternating -current meter usually needs to embed multiple single -phase mutual inductor, so as to carry out current sampling to three -phase current. This design causes the overall volume of three -phase alternating -current meter to become relatively large, and the production installation is time -consuming. This characteristic greatly limits the installation and use of electric energy meter in certain application occasions, especially in compact or narrow environment. Therefore, under these special conditions, the production and manufacture of traditional three -phase mutual inductor type alternating -current meter is time -consuming and labor -intensive, and further affects the overall efficiency and monitoring ability of the system.

[0003] Therefore, in view of the above problems, further improvement is needed. INVENTION CONTENTS

[0004] The main purpose of the utility model is to provide a three -phase alternating -current meter based on built -in three -in -one mutual inductor, which integrates multiple single mutual inductor. This design not only optimizes the structure and performance, but also meets the basic functional requirements of the electric meter in display, communication, measurement and pulse output, greatly improves the actual use experience of mutual inductor type electric energy meter, and meets the demand of modern power system for space and equipment configuration.

[0005] To achieve the above purpose, the utility model provides a three -phase alternating -current meter based on built -in three -in -one mutual inductor, which includes main control MCU, auxiliary power module, three -in -one mutual inductor, current sampling module, voltage sampling module and measurement chip, wherein:

[0006] The input end of the auxiliary power module is connected with the external power supply through the terminal LN, and the first output end (i.e. output 1) of the auxiliary power module is respectively connected with the main control MCU and the measurement chip (i.e. power supply for the main control MCU and the measurement chip), and the main control MCU is connected with the measurement chip;

[0007] The input end of the three -in -one mutual inductor is respectively connected with the current transformer CT1 installed at the power grid L1 end, the current transformer CT2 installed at the power grid L2 end and the current transformer CT3 installed at the power grid L3 end through the current input terminal, and the output end of the three -in -one mutual inductor is connected with the input end of the current sampling module, and the output end of the current sampling module is connected with the measurement chip;

[0008] The input end of the voltage sampling module is electrically connected with the grid L1 end, the grid L2 end, the grid L3 end and the grid N end through the voltage input terminals respectively, and the output end of the voltage sampling module is electrically connected with the metering chip.

[0009] As a further preferred technical scheme of the above technical scheme, the second output end (i.e., output 2) of the auxiliary power module is electrically connected with the communication module through an isolation module (i.e., to supply power to the communication module), and the communication module is externally connected through terminals AB.

[0010] As a further preferred technical scheme of the above technical scheme, the second output end (i.e., output 2) of the auxiliary power module is also electrically connected with a storage module, a display module and a pulse output module respectively.

[0011] As a further preferred technical scheme of the above technical scheme, the communication module is electrically connected with the main control MCU.

[0012] As a further preferred technical scheme of the above technical scheme, the main control MCU is also electrically connected with the storage module, the display module and the pulse output module respectively. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a structural schematic view of a three-phase AC meter based on a built-in three-in-one mutual inductor. DETAILED DESCRIPTION

[0014] The following description is provided to enable any person skilled in the art to practice the present application. The preferred embodiments described below are only examples of the present application, and other obvious modifications can be made by those skilled in the art. The basic principles defined in the following description can be applied to other embodiments, modifications, improvements, equivalents and other technical solutions without departing from the spirit and scope of the present application.

[0015] The utility model discloses a three-phase AC meter based on built-in three-in-one mutual inductor, below combining preferred embodiment, to the specific embodiment of utility model makes further description.

[0016] In the embodiments of the present application, those skilled in the art should note that the grid L1 / L2 / L3 / N end and the like involved in the present application can be regarded as prior art.

[0017] Preferred embodiments.

[0018] The utility model discloses a three-phase AC meter based on built-in three-in-one mutual inductor, including main control MCU, auxiliary power module, three-in-one mutual inductor, current sampling module, voltage sampling module and metering chip, wherein:

[0019] The input end of the auxiliary power module is connected with an external power supply through a terminal LN, and the first output end (i.e. output 1) of the auxiliary power module is electrically connected with the master control MCU and the metering chip respectively (i.e. to supply power to the master control MCU and the metering chip), and the master control MCU is electrically connected with the metering chip;

[0020] The input end of the three-in-one current transformer is connected with a current transformer CT1 installed at the L1 end of the power grid, a current transformer CT2 installed at the L2 end of the power grid and a current transformer CT3 installed at the L3 end of the power grid through current input terminals respectively, the output end of the three-in-one current transformer is connected with the input end of the current sampling module, and the output end of the current sampling module is electrically connected with the metering chip.

[0021] The input end of the voltage sampling module is electrically connected with the L1 end of the power grid, the L2 end of the power grid, the L3 end of the power grid and the N end of the power grid through the voltage input terminals respectively, and the output end of the voltage sampling module is electrically connected with the metering chip.

[0022] Specifically, the second output end (i.e. output 2) of the auxiliary power module is electrically connected with the communication module through an isolation module (i.e. to supply power to the communication module), and the communication module is connected with an external communication terminal through a terminal AB.

[0023] More specifically, the second output end (i.e. output 2) of the auxiliary power module is also electrically connected with a storage module, a display module and a pulse output module respectively.

[0024] Further, the communication module is electrically connected with the master control MCU.

[0025] Still further, the master control MCU is also electrically connected with the storage module, the display module and the pulse output module respectively.

[0026] For the utility model:

[0027] As follows Figure 1In operation, the power supply is connected to the meter through terminals L N into the auxiliary power module processing, generating output 1 and output 2. Output 1 is the main power supply of the entire meter, mainly to supply power to the main control MCU and the metering chip; output 2 is processed by the isolation module to supply power to the communication module. At the same time, the other modules of the meter - storage, display and pulse output module also work normally. The current sampling part of the meter integrates the single-phase transformer 1, single-phase transformer 2 and single-phase transformer 3 in the traditional mutual inductor three-phase AC meter into one - the three-in-one mutual inductor; the current generated by CT1, CT2 and CT3 is still directly processed through the three-in-one mutual inductor to the current sampling module through the current input terminal, and then the current sampling signal is output to the metering chip. The L1 L2 L3 N of the power grid is connected to the voltage input terminal of the meter, flows through the voltage sampling module, and finally the signal is sent to the metering chip. The collection of the voltage signal is completed, thereby completing the metering function of the meter. The three-in-one mutual inductor also has the anti-strong magnetic function that the traditional mutual inductor does not have, and the safety in preventing electricity stealing is not possessed by the ordinary single mutual inductor.

[0028] The utility model has the advantages that:

[0029] Structure: The three-in-one mutual inductor and the meter are integrated, which greatly improves the space utilization, reduces the size of the meter, and optimizes the structure of the meter, making the meter more compact and delicate in structure.

[0030] Anti-interference and stability: The built-in three-in-one mutual inductor is carefully optimized in design and material, with excellent anti-interference performance. Especially in a strong magnetic field environment, the built-in three-in-one mutual inductor can effectively shield external strong magnetic interference, ensuring the accuracy and stability of the measurement. Whether in industrial automation, energy monitoring or other fields requiring high-precision measurement, this anti-strong magnetic effect can greatly improve the overall reliability of the system, ensuring the normal operation of the equipment in complex working environment. Therefore, the built-in three-in-one mutual inductor not only meets the daily use requirements, but also ensures the accuracy of the measurement in special harsh environments.

[0031] It is worth mentioning that the power grid L1 / L2 / L3 / N terminal and other technical features involved in the utility model patent application should be regarded as prior art. The specific structure, working principle and possible control method, spatial arrangement method of these technical features can be selected by the conventional method in the field, and should not be regarded as the invention point of the utility model patent. The utility model patent will not be further expanded and described in detail.

[0032] Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A three-phase AC meter based on built-in three-in-one current transformer, characterized in that, The main control MCU, the auxiliary power module, the three-in-one mutual inductor, the current sampling module, the voltage sampling module and the metering chip are included, wherein: The input end of the auxiliary power module is connected with an external power supply through a terminal LN, and the first output end of the auxiliary power module is electrically connected with the main control MCU and the metering chip respectively; The input end of the three-in-one mutual inductor is connected with a current transformer CT1 installed at the L1 end of the power grid, a current transformer CT2 installed at the L2 end of the power grid and a current transformer CT3 installed at the L3 end of the power grid through current input terminals respectively, the output end of the three-in-one mutual inductor is connected with the input end of the current sampling module, and the output end of the current sampling module is electrically connected with the metering chip; The input end of the voltage sampling module is electrically connected with the L1 end, the L2 end, the L3 end and the N end of the power grid through voltage input terminals respectively, and the output end of the voltage sampling module is electrically connected with the metering chip.

2. A three-phase AC energy meter based on built-in three-in-one current transformer as claimed in claim 1, wherein, The second output end of the auxiliary power module is electrically connected with a communication module through an isolation module, and the communication module is connected with an external communication through a terminal AB.

3. A three-phase AC energy meter based on built-in three-in-one current transformer as claimed in claim 2, wherein, The second output end of the auxiliary power module is also electrically connected with a storage module, a display module and a pulse output module respectively.

4. The three-phase AC energy meter based on the built-in three-in-one mutual inductor of claim 3, characterized in that, The communication module is electrically connected with the main control MCU.

5. A three-phase AC energy meter based on built-in three-in-one current transformer as claimed in claim 4, wherein, The main control MCU is also electrically connected with the storage module, the display module and the pulse output module respectively.

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