Algorithm for automatically identifying 192 three-phase three-wire electric energy meter wiring modes

Abstract

The invention relates to an algorithm for automatically identifying 192 three-phase three-wire electric energy meter wiring modes, comprising the following steps: letting the voltages U(.)24, U(.)64 and U(.)40 of an electric energy meter input to a smart instrument be U(.)1, U(.)2 and U(.)3 respectively; measuring four phase differences through the smart instrument, namely, the phase difference Phi<U2> of U(.)64 lagging behind U(.)24, the phase difference Phi<U3> of U(.)40 lagging behind U(.)24, the phase difference Phi<I1> of I(.)1 lagging behind U(.)24, and the phase difference Phi<I5> of I(.)5 lagging behind U(.)24; inputting the four phase differences into a judgment unit of the smart instrument, and identifying the voltage wiring mode of the three-phase three-wire electric energy meter though the judgment unit; getting the phase difference Phi of U(.)a lagging behind U(.)24 and the phase difference Phi<c> of U(.)c lagging behind U(.)24 under each mode of voltage wiring; storing each mode of voltage wiring and corresponding Phi and Phi<c> in the smart instrument in the form of table, judging the phase difference of I(.)5 lagging behind I(.)1, and getting the current wiring mode of the electric energy meter under different phase differences of I(.)5 lagging behind I(.)1; and getting the voltage and current wiring modes of the three-phase three-wire electric energy meter. The beneficial effects are as follows: the algorithm has less measurement parameters; by putting forward the phase difference Phi<U3> of the measurement voltage U(.)40 lagging behind U(.)12, identification is quick and efficient; and the algorithm is suitable for popularization.

Description

technical field [0001] The invention relates to the technical field of electrical measurement, in particular to an algorithm for automatically distinguishing 192 wiring modes of three-phase three-wire electric energy meters. Background technique [0002] The 10kV high-voltage electric energy metering device includes voltage transformer TV, current transformer TA, electric energy meter and secondary connection. Whether the wiring of the energy meter is correct or not is related to the polarity of TV and TA, and the direction of the secondary connection. The active energy metering of medium and large users in my country's distribution network adopts the following methods: figure 1 In the wiring method shown, two TVs and two TAs need to be connected at the same time. Wiring Recorded as: Within each wire symbol is the paired voltage and current phasors on a set of drive elements. The voltage input terminals 2, 4, and 6 of the electric energy meter are respectively connect...

AI Technical Summary

Problems solved by technology

[0014] (6) In the past 10 years, the equipment commonly used by the power sector to test electric energy meters is also the "three-phase electric energy meter field calibrator", which has many functions, many parameters to be measured, and the display content is many and beautiful, and the cost is high.

The main function of this kind of calibrator is to verify the measurement accuracy of the electric energy meter, not to judge the wiring error, and it cannot be judged correctly if the TV secondary polarity is reversed.

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