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Harmonics and interharmonics including mains signalling at AC power port, low frequency immunity

IEC 61000-4-13/GB/T 17626.13: Low-frequency immunity test of AC power port harmonics, interharmonics and grid signals

　　1. Overview

　　This standard specifies the test methods for the immunity of electrical and electronic equipment with a rated current of each phase less than or equal to 16A in the low-voltage power grid (50Hz) to harmonics and interharmonics with a disturbance frequency up to 2kHz, and proposes basic test levels. scope.

　　This standard does not apply to electrical and electronic equipment connected to 16 2/3 Hz or 400 Hz AC networks. Tests on equipment in these networks will be considered in other standards.

　　The purpose of this standard is to establish a common benchmark for evaluating the low frequency immunity of electrical and electronic equipment to harmonics, interharmonics and grid signal frequencies. The test methods specified in this standard are general methods for evaluating the immunity of electrical and electronic equipment to harmonics, interharmonics and grid signal frequencies.

　　harmonic:

　　Harmonics are sinusoidal voltages and currents with frequencies that are integer multiples of the operating frequency of the power supply system.

　　Harmonic disturbances are usually caused by equipment with non-linear voltage-current characteristics or due to periodic and linear synchronous operation of loads. These devices can be considered as harmonic current sources.

　　Harmonic currents from different harmonic sources generate harmonic voltage drops across the network impedance.

　　Due to the existence of cable capacitance and line inductance in the network, and the connection of capacitors to improve power factor, parallel or series resonance may occur, and even form harmonic voltage amplification in places far away from distorted loads. The formed waveform is one or several The result of the addition of harmonics of different orders of a harmonic source.

　　Interharmonic:

　　Between the harmonic voltage and harmonic current of the power frequency, some frequencies that are not integer multiples of the fundamental frequency can be observed, and they appear in discrete frequencies or in a broadband spectrum. The accumulation of different interharmonic sources is not possible and is not considered in this standard.

　　Grid new number (ripple control):

　　In a network or local network, signals with frequencies ranging from 110Hz to 3kHz are used to transmit information from one sending point to one or more receiving points. The frequency range in this standard is limited to 2kHz/50Hz.

　　2. Test system layout:

　　The test generator should have the ability to generate the fundamental frequency of 50 Hz and to superimpose the required frequencies (harmonics and frequencies between harmonics).

　　The test generator should have a good filtering effect, so that the harmonic and interharmonic disturbances of the test will not affect the auxiliary equipment. In addition to the test generator, immunity tests may require the following equipment:

　　² Harmonics and interharmonics analyzers that meet the requirements of GB/T 17626.7, in order to verify the test voltage at the EUT terminal;

　　² During the test, provide a control unit for selecting the superimposed voltage sequence;

　　² Printer or plotter for recording test voltage sequence;

　　² An oscilloscope to monitor the voltage applied to the EUT.

　　Some functions in these items may be integrated in one unit.

　　An example of a test setup is as follows:

　　3. System Configuration

serial number	product	illustrate	brand
3.1	NetWave 30	Three Phase Multifunction AC/DC Power Supply, 30kVA, with Arbitrary Waveform Generator, Compliant with IEC 61000-4-13, -4-14, -4-17, -4-27, -4-28, -4-29 And MIL-STD-704 and aviation standard requirements; 3520V AC (pp), +/-425V DC; controlled by netwave.control test software; power supply voltage 3400V or 3*480V	EM TEST/ Switzerland
3.2	HAR-tab	Harmonic flicker test environment, including solid wood test table, insulation support, etc.	Wisdom/China
3.3	Control-tab	computer	Wisdom/China

Century Wisdom (Suzhou) Testing Technology Co., Ltd

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