Automatic identification method for terminal phase sequence

An automatic identification and terminal technology, applied in the direction of phase sequence/synchronous indication, etc., can solve the problem of not being in the same phase sequence, and achieve the effect of easy popularization and application

Inactive Publication Date: 2019-04-26
JIANGSU INTELEVER ENERGY TECH CO LTD
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Problems solved by technology

[0004] At present, there is no literature that proposes an accurate, effective, and fast method for automatic identification of terminal phase sequences, and there is no frequency domain decomposition based on the collected voltage and current signals to obtain the fundamental wave amplitude-frequency characteristics of voltage and current, and analyze

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  • Automatic identification method for terminal phase sequence
  • Automatic identification method for terminal phase sequence
  • Automatic identification method for terminal phase sequence

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Embodiment Construction

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] A terminal phase sequence automatic identification method, comprising the following steps:

[0035] Step 1: Collect the basic electrical parameters voltage value u and current value i when the terminal works stably; use voltage and current transformers to collect the voltage and current values ​​under the stable working state of the terminal respectively, where the voltage u and current i are filtered and removed The sampling sequence of the voltage signal after noise processing, set the sampling frequency between 500Hz and 2kHz

[0036] Step 2: Decompose the collected voltage and current signals in the frequency domain to obtain the fundamental amplitude-frequency characteristics of the voltage and current;

[0037] The frequency-domain analysis method of the discrete Fourier transform fast algorithm is selected, and the volt...

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Abstract

The invention discloses an automatic identification method for a terminal phase sequence. The method comprises the following steps that 1, a basic electrical parameter voltage value u and a current value I when a terminal stably works are collected; 2, collected voltage and current signals are subjected to frequency domain decomposition to obtain base wave amplitude frequency characteristics of voltage and current; 3, the phase angle of a time moment corresponding to voltage and current waveforms in a base wave is analyzed, and whether or not the voltage and current are in the same phase sequence. According to the method, the three phase of the current and voltage can be judged just through a phase angle difference, and the method has the advantages of being simple, economical, easy to apply and popularize and the like.

Description

technical field [0001] The invention belongs to the field of electrical engineering, in particular to an automatic identification method for a terminal phase sequence. Background technique [0002] When electrical equipment such as electric actuators, excavators, and three-phase motors need to be reconnected to the power supply due to maintenance or work site transfer, it is inevitable that the phase sequence will be reversed, so that it cannot work normally; for equipment that only allows one-way rotation Said that it may cause damage to its rotating components; due to the change of the phase sequence of the passenger elevator, the running direction is opposite to the predetermined direction, which may endanger the safety of life. The early phase sequence detection circuit is composed of capacitors and resistors. Although the structure is simple, the capacitance value is large, and the indication of the indicator light is required. Detection, some of the existing phase seq...

Claims

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Application Information

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IPC IPC(8): G01R29/18
CPCG01R29/18
Inventor 傅萌邓士伟苗青冯燕钧何朝伟潘海龙洪佳燕
Owner JIANGSU INTELEVER ENERGY TECH CO LTD
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