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Three-phase voltage unbalance immunity test

　　1. Overview

　　This standard is the basic standard of EMC (Electromagnetic Compatibility), which involves the immunity test of electrical and/or electronic devices (equipment and systems) in their electromagnetic environment. Concerns only conducted phenomena, including the immunity of equipment connected to public and industrial networks.

　　This standard applies to electrical and/or electronic devices with a 50Hz three-phase power supply and a rated line current of each phase below 16A.

　　If the three-phase equipment is operated as a set of single-phase loads connected between phase and neutral, this standard does not apply to such three-phase plus neutral equipment. At the same time, this test is not applicable to electrical and/or electronic devices connected to the AC 400Hz distribution network. Tests involving these networks are included in other IEC standards. This standard does not include tests for zero-sequence imbalance factors.

　　Voltage unbalance: In a polyphase system, the effective value of each phase voltage or the phase angle between adjacent phases is not exactly equal.

　　Three-phase electrical and electronic equipment can be affected by unbalanced voltages. The main cause of unbalance is single-phase loads. Unbalance is caused by changes in voltage amplitude or phase displacement.

　　The purpose of this test is to establish a reference for the evaluation of the immunity of electrical and/or electronic installations when they are subjected to unbalanced supply voltages, which may cause:

　　--- AC rotating motor overcurrent;

　　--- Power electronic converters generate non-characteristic harmonics;

　　---Synchronization problems or control errors in the control part of electrical equipment.

　　2. Test system layout:

　　To carry out the test, the power supply cable specified by the manufacturer must be used to connect the EUT to the test generator. If the length of the supply cable is not specified, the shortest cable suitable for the EUT shall be used. The cable length shall be stated in the test report.

　　Figure 1 shows a schematic diagram of an unbalanced voltage (amplitude or phase change) generated by a test generator and a power amplifier.

　　Test generators having transformers and switches with voltage regulators on at least two of their phases.

　　The ports of the EUT shall be connected with appropriate peripheral devices according to the manufacturer's instructions. If there are no suitable peripheral devices, they may be simulated.

Fig.1 Schematic diagram of the test device

　　3. System Configuration

serial number	product	illustrate	brand
3.1	NetWave 30	Three-phase multifunctional AC/DC power supply, 30kVA, with arbitrary waveform generator, conforming to 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

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