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DC power input port voltage dip, short interruption and voltage variations test

　　1. Overview

　　IEC 61000-4-29 is applicable to immunity tests for voltage dips, short interruptions and voltage variations of electrical and electronic equipment supplied with DC power.

　　- voltage dip

　　A sudden drop in voltage at a certain point in an electrical system, returning to normal after a period of half a cycle or even a few seconds.

　　- short interruption voltage interruption

　　The power supply voltage suddenly disappears for a period of time, generally not more than one minute.

　　- voltage variation

　　The supply voltage goes above and below the rated voltage, the duration of the change can be longer or shorter relative to the period.

　　The test level of the voltage sag is expressed in %UT (the remaining voltage after the sag is the percentage of the reference voltage): 0%, 40%, 70%, 80%.

　　A short interruption generally refers to a complete interruption of the power supply for 250 cycles (50Hz) or 300 cycles (60Hz)

　　The voltage change generally refers to the situation where it is maintained for one cycle after a sudden change to 70%, and then returns to the reference voltage after 25/30 cycles.

　　2. Test method and test arrangement

　　2.1. Test method

　　When the test generator generates a short-time interruption, the following requirements shall be met:

　　--When running in "low impedance", it can absorb the inrush current from the load (if it happens)

　　--When running in "high impedance", it can block the reverse surge current of the load

　　-- In voltage sags and voltage changes, the generator should operate in a "low impedance" state

　　2.1.1 Characteristics of the test generator operating at low impedance:

　　--Peak surge current drive capability:

　　When U=24v, 50A

　　When U=48V, 100A

　　When U=110V, 220A

　　-- Impulse current polarity: positive polarity (flow to EUT), negative polarity (reverse from EUT)

　　2.1.2 Characteristics of test generator operating in high impedance state (short interruption)

　　During a short interruption, the impedance of the output terminal of the generator should be ≥100kΩ, and its impedance needs to be measured at a voltage level up to 3×U0 and in both polarities.

　　Examples of test generators and arrangements Figure A.1 and Figure A.2 show possible test block diagrams In Figure A.1, voltage dips, short interruptions and voltage changes are simulated by two DC power supplies with variable output voltages . The duration of the interruption can be preset. The voltage drop and rise can be simulated by alternately closing switch 1 and switch 2. These two switches must never be closed at the same time. When carrying out voltage drop and voltage change tests in the "low impedance" state, special precautions must be taken, for example: use capacitors to avoid "high impedance". Turn on two switches at the same time to realize power interruption, that is, in the "high impedance" test state, replace the current source 2 with a short circuit or low impedance, so that the test generator can absorb the reverse current from the load, and realize power interruption, that is, "low impedance" Impedance" test state test generators can include diodes, resistors and fuses as well as switches. In Figure A.2, the programmable power supply replaces the DC power supply and the switch. This test arrangement is also applicable to the ripple immunity test of the DC power supply (GB/T17626.17)

　　2.2. Test layout

　　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	Test environment, including solid wood test table, insulation support, etc.	Wisdom/China
3.3	Control-tab	computer	Wisdom/China

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