Three-phase access type electric energy meter with electronic transformers and metering method for three phase access type electric energy meter
An electronic transformer and electric energy metering technology, which is applied in the direction of measuring electric variables, instruments, measuring devices, etc., to achieve the effects of low power consumption, solving wrong metering, and small volume and weight
Inactive Publication Date: 2013-09-11
陈永山
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Problems solved by technology
It is impossible to balance the grid load in reality, so the three-phase three-wire two-element metering method has many limitations, and there are also many loopholes in electricity theft
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Embodiment Construction
[0035] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings of the specification:
[0036] See figure 1 , The present invention provides a three-phase intelligent electric energy meter with electronic transformer access. The electric energy meter includes a voltage follower, an electric energy measurement chip, a microprocessor, a display unit, a storage unit, and a communication unit. The input terminal of the voltage follower is connected to the output terminal of the secondary side of the electronic transformer. The analog signals output by the secondary side of the electronic transformer are all in the form of weak voltage. In order to ensure that the weak voltage analog signals are not distorted during AD conversion processing, the electric energy The meter uses a voltage follower to process this weak voltage signal; the output end of the voltage follower is connected to the input end of the energy ...
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The invention provides a three-phase access type electric energy meter with electronic transformers and a metering method for the three-phase access type electric energy meter. The metering method includes respectively enabling a resistance voltage dividing electronic voltage transformer and an electronic current transformer to access each of a phase A, a phase B and a phase C of a three-phase power grid to form three-element power grid parameter detection units with the electronic transformers; enabling analog voltage signals outputted by secondary sides of the electronic transformers to access the three-phase intelligent electric energy meter so that electric energy can be metered. The three-phase intelligent electric energy meter with the electronic transformers and the metering method have the advantages that a three-phase four-wire three-element metering mode is adopted for the three-phase intelligent electric energy meter, so that the problem of erroneous metering of double three-phase three-wire elements under an unbalanced load condition is thoroughly solved, the problem of power stealing loopholes is solved, and high-precision and high-reliability metering can be implemented.
Description
Technical field: [0001] The invention belongs to the field of electric energy measurement, in particular to an intelligent electric energy meter used for measuring weak voltage analog signal output from the secondary side of an electronic transformer, and is an electric energy meter of a new type of measurement mode. [0002] Background technique: [0003] In the three-phase power grid, especially when the metering system of the 6kV, 10kV, and 35kV medium and low voltage power grids collects the parameters of the primary side power grid, the electronic transformer adopts the principle of resistance voltage division, and uses the nano-conductive material with independent intellectual property rights of the company, which is better than the traditional electromagnetic mutual inductance. The transformer has lower power consumption, smaller volume and weight, less material loss, and is safer. Therefore, the use of electronic transformers can save energy and reduce losses, and ...
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IPC IPC(8): G01R22/06
Inventor 陈永山
Owner 陈永山