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Intelligent identification type electric energy meter

A technology of intelligent identification and electric energy meter, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., to achieve the effect of improving utilization, reliable implementation, and reducing power loss

Active Publication Date: 2015-01-21
WUHAN SAN FRAN ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide an intelligent identification type electric energy meter to solve the problem of on-site special treatment for different wiring methods of the existing three-phase three-wire and three-phase four-wire compatible electric energy meters

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1 provided by the present invention is an embodiment of a three-phase switching power supply, such as figure 2 and image 3 The schematic diagram and the circuit diagram of the three-phase switching power supply provided by the embodiment of the present invention are shown respectively.

[0033] Depend on figure 2 It can be seen that the three-phase full-bridge rectifier circuit includes diodes D1, D2, D3, D5, D7 and D8. After the ABC three-phase is connected to the three-phase full-bridge rectifier circuit, one output terminal A is connected to the neutral line judgment circuit, and the other output terminal B is connected to the neutral line judgment circuit. In the intelligent step-down circuit, the output terminal A is the positive terminal of the diodes D5, D7 and D8, and the output terminal B is the negative terminal of the diodes D1, D2 and D3.

[0034] The neutral line judgment circuit includes a field effect transistor Q2, the gate of the field e...

Embodiment 2

[0042] Embodiment 2 provided by the present invention is an embodiment of a method for the MCU to determine the specification of the access voltage according to the voltage angle between the three phases.

[0043] In the embodiment of the present invention, after the MCU receives the signal that the neutral wire is missing, it further determines whether the connection mode is three-phase four-wire or three-phase three-wire according to the voltage angle between the three phases, and the judgment basis is shown in Table 1.

[0044]

[0045] Table 1: The voltage angle range between the three phases and the corresponding table of wiring mode

[0046] It can be seen from Table 1 that the basis for judgment includes:

[0047] The voltage angle range between A and B phase lines is 105°~135°, the voltage angle range between A and C phase lines is 225°~255°, and the voltage angle range between B and C phase lines is 105° ~135° or the voltage angle between A and B phase lines is 22...

Embodiment 3

[0052] The third embodiment provided by the present invention is an embodiment of the method for the MCU to determine the specification of the access voltage according to the voltage angle between the three phases. In the embodiment of the present invention, after the MCU initially judges the connection mode after receiving the signal of whether the neutral line is missing, the MCU judges the specifications of the access voltage according to the voltage values ​​between the three phases, and the judgment basis is shown in Table 2.

[0053]

[0054] Table 2: Correspondence between voltage and wiring mode between three phases

[0055] Specifically:

[0056] When the voltage range of phase A is 75-132V, the voltage range of phase B is less than 40V, and the voltage range of phase C is 75-132V, it is judged that the wiring mode is three-phase three-wire 3×100V.

[0057] The voltage range of phase A is 75-132V, the voltage range of phase B is less than 40V, the voltage range of...

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Abstract

The invention is suitable for the technical field of three-phase electric energy meters and provides an intelligent identification type electric energy meter. The intelligent identification type electric energy meter comprises a three-phase switch power source, an MCU module, a phase-B and null line switching circuit and an electric energy metering and electric energy meter function module. The three-phase switch power source comprises a null line judging circuit, a three-phase three-line full-bridge rectifying circuit, a three-phase four-line half-bridge rectifying circuit, an intelligent voltage reduction circuit, a null line lacking signal output circuit and a DC-DC switch power circuit. The three-phase switch power source is connected with the MCU module, the phase-B and null line switching circuit and the electric energy metering and electric energy meter function module and supplies power to the MCU module, the phase-B and null line switching circuit and the electric energy metering and electric energy meter function module. The electric energy metering and electric energy meter function module achieves the measurement of three-phase input voltage, the metering of electric energy and the basic function of the electric energy meter. The MCU module is in control connection with the phase-B and null line switching circuit and the electric energy metering and electric energy meter function module and receives output signals of the null line lacking signal output circuit. Adaptive wiring is completed internally according to judgment signals, and electric energy meter wiring does not need to be specially handled for different wiring modes.

Description

technical field [0001] The invention belongs to the technical field of three-phase electric energy meters, in particular to an intelligent identification type electric energy meter. Background technique [0002] As an electric energy metering device, three-phase electric energy meters are widely used. The commonly used voltage specifications are 3×57.7 / 100V, 3×100V and 3×220 / 380V. It is a three-phase three-wire electric energy meter and a three-phase four-wire electric energy meter. [0003] The measurement methods, wiring methods and voltage levels of the three-phase three-wire electric energy meter and the three-phase four-wire electric energy meter are different, so the two electric energy meters are designed, produced and used separately. Energy meter manufacturers need to produce energy meters of different specifications according to the needs of customers. Manufacturing three-phase three-wire and three-phase four-wire compatible energy meters can greatly reduce the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R22/06G01R31/02G01R29/16
Inventor 李中泽盘秋荣荣振宇王伟常莉
Owner WUHAN SAN FRAN ELECTRONICS CO LTD
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