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Voltage fluctuation immunity test

IEC 61000-4-14/GB/T 17626.14: Voltage fluctuation immunity test

　　1. Overview

　　This standard specifies the immunity tests of electrical and/or electronic equipment in the electromagnetic environment in which they are located, considering only conducted phenomena, including immunity tests of equipment connected to public and industrial power supply networks. The purpose is to give a benchmark for evaluating the immunity of electrical and electronic equipment when subjected to positive and negative voltage fluctuations of low magnitude.

　　The voltage fluctuations involved in this standard do not include flicker, which is a physiological phenomenon caused by fluctuations in light brightness.

　　This standard applies to electrical and/or electronic equipment with a rated current of not more than 16A per phase, and does not apply to electrical and electronic equipment connected to DC or 400Hz AC power distribution networks

　　Causes of voltage fluctuations: There are a large number of household appliances in the low-voltage network, but the voltage fluctuations generated by these appliances are generally not obvious. Voltage fluctuations are mainly caused by:

　　a) Continuous but changing large loads, such as resistance welding machines, rolling mills, large electric motors with varying loads, electric arc furnaces, arc welding equipment, etc.;

　　b) a single opening/closing operation of a load (such as a motor);

　　c) Step voltage changes (caused by transformer tap voltage regulators).

　　The voltage fluctuations generated by these industrial equipment can affect a large number of users. Such equipment operates in continuous or infrequent operation. The impedance value of the public power supply network varies widely, so the propagation of disturbance is different for different networks.

　　Effects of voltage fluctuations: Electrical and electronic equipment can be affected by voltage fluctuations, including:

　　--- The performance of the equipment is reduced when it is used as an energy storage device (such as a capacitor);

　　--- Loss of function of the control system;

　　---The internal voltage and current of the equipment are unstable;

　　--- Ripple increases.

　　2. Test system layout:

　　Figure 1 shows the configuration block diagram of the voltage fluctuation immunity test.

Fig.1 Schematic diagram of the test device

　　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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