Voltage negative phase sequence detection method and system for three-phase electric energy meter

A technology of a three-phase electric energy meter and a detection method, which is applied in the direction of phase sequence/synchronous indication, measuring electricity, measuring devices, etc., can solve problems such as low reliability, complicated circuits, and inconvenient debugging, so as to improve measurement accuracy and reliability effect

Active Publication Date: 2016-10-12
SHENZHEN STAR INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The three-phase three-wire electric energy meter will not measure
Unless an independent phase voltage sampling circuit, comparison circuit, signal isolation circuit is added, and the sequence of zero-crossing signals of each phase is regularly detected by the microprocessor, the processing cost is relatively high, the circuit is complex, the reliability is not high, and it is inconvenient to debug

Method used

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  • Voltage negative phase sequence detection method and system for three-phase electric energy meter
  • Voltage negative phase sequence detection method and system for three-phase electric energy meter
  • Voltage negative phase sequence detection method and system for three-phase electric energy meter

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Embodiment 1

[0113] like figure 2 As shown, it is a structural principle diagram of a manganese-copper three-phase electric energy meter in the prior art, and the microprocessor 1 and three single-phase metering chips are connected through two optocoupler components. Therefore, the voltage signals collected between individual single-phase metering chips cannot be input into a unified integrated metering chip for the same data calculation. That is, based on three mutually isolated and independent single-phase metering chips, the communication connection with the microprocessor cannot be realized, so the corresponding phase voltage zero-crossing time cannot be obtained, and the detection based on the phase voltage zero-crossing time cannot be realized.

[0114] Each metering unit adopted in the manganese-copper three-phase four-wire electric energy meter of this embodiment, in addition to the basic electric energy metering function, also has the phase voltage zero-crossing time detection fu...

Embodiment 2

[0128] Please refer to Figure 4 , this embodiment provides a method for detecting the reverse phase sequence of the three-phase electric energy meter voltage in the three-phase three-wire connection mode. The three-phase electric energy meter in the three-phase three-wire connection mode corresponds to two measurement chips, that is, the first phase measurement unit 2 And the second phase metering unit 3, corresponding detection A-phase voltage and C-phase voltage, can specifically include:

[0129] The microprocessor 1 sends a broadcast command to calculate the zero-crossing time of the phase voltage, and the first phase metering unit 2 and the second phase metering unit 3 in the electric energy meter will read the broadcast command; the calculation phase voltage zero-crossing The time broadcast command is used to freeze the zero-crossing time of the phase voltage, and calculate and obtain the latest zero-crossing time in the sine wave phase voltage; the first phase metering...

Embodiment 3

[0138] see Figure 9 , this embodiment provides a reverse phase sequence detection method for a three-phase electric energy meter, which can support the phase sequence detection of a three-phase four-wire electric energy meter or a three-phase three-phase electric energy meter; specifically, it may include:

[0139] S1: The microprocessor sends a broadcast command to calculate the zero-crossing time of the phase voltage, and the first phase metering unit 2, the second phase metering unit 3 and the third phase metering unit 4 in the electric energy meter will receive the broadcast command at the same time;

[0140] S2: After the first phase metering unit 2 receives the broadcast command to calculate the zero-crossing time of the phase voltage, it can calculate and obtain the latest zero-crossing time of the first phase voltage corresponding to the first phase metering unit 2, that is, calculate and obtain the first phase voltage The zero-crossing time T1, namely Ta, is then sto...

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Abstract

The invention provides a voltage negative phase sequence detection method and system for manganese-copper three-phase four-wire and three-phase three-wire electric energy meters. The method for the three-phase four-wire electric energy meter comprises the steps that a microprocessor transmits a broadcast command for calculating the phase voltage zero crossing time to a first phase metering unit, a second phase metering unit and a third phase metering unit in the electric energy meter. The microprocessor reads the first phase voltage zero crossing time T1 calculated by the first phase metering unit, the second phase voltage zero crossing time T2 calculated by the second phase metering unit and the third phase voltage zero crossing time T3 calculated by the third phase metering unit, and judges whether T1, T2 and T3 meet the following relations: T1<T2<T3, or T2<T3<T1 or T3<T1<T2 or not: determining the negative phase sequence of the electric energy meter if the T1, T2 and T3 do not meet the following relations: T1<T2<T3, or T2<T3<T1 or T3<T1<T2. The method can timely find a wiring error in an installation process, prevents a lawbreaker from enabling the electric energy meter to record electric consumption less to steal electricity through employing negative phase sequence, and improves the metering accuracy and reliability of the three-phase electric energy meter.

Description

technical field [0001] The invention relates to the field of electric energy metering, in particular to a detection method and a system thereof for the reverse phase sequence of the voltage of a three-phase electric energy meter. Background technique [0002] In the field of electric energy measurement, the installation and wiring method of the three-phase electric energy meter is very important. Under normal circumstances, the phase sequence of the three-phase voltage is that phase A leads phase B by 120°, phase B leads phase C by 120°, and phase C leads phase A by 120°. At this time, it is called positive phase sequence; figure 1 As shown, it is a schematic diagram of the correct wiring of the three-phase four-wire electric energy meter, and the entire metering system has only one reference ground. On the contrary, if phase B leads phase A by 120° or phase C leads phase B by 120° or phase A leads phase C by 120°, this phase sequence is called reverse phase sequence of pha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/18G01R31/50
CPCG01R29/18G01R31/50
Inventor 娄震旦刘春华张平刘祥生
Owner SHENZHEN STAR INSTR
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