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Voltage dips, short interruptions and voltage variations immunity

1. Introduction to the test

　　Voltage sags and voltage interruptions are caused by failures of the grid, power facilities, or sudden large changes in load. Voltage variations are caused by continuous changes in loads connected to the grid. If the EUT cannot respond in time to the change of the power supply voltage, it may cause a failure.

　　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.

Test schematic

2. System connection diagram - single phase 16A

3. Typical configuration - single phase 16A

Voltage drop immunity test system [according to IEC 61000-4-11/GB T 17626.11]
serial number	product	illustrate	brand
1	Compact NX5	Ultra-small conducted anti-interference signal simulator, including electrical fast transient burst module EFT/N5, surge module VCS/N5 and communication wave surge module Tsurge5, power failure module PFS/N5 and single-phase 300V/ 16A coupling/decoupling network	EMTEST/ Switzerland
2	variac NX1-260-16	0-280V/16A automatic voltage regulator	EMTEST/ Switzerland
3	iec.control	Remote control and report generation software to control a test device, suitable for UCS, EFT, VCS, PFS, TSS and other test devices	EMTEST/ Switzerland
4	EMS-TAB	EMS test environment, including test table, horizontal coupling board, insulation support, etc. Specifically includes a 2.021.020.8m solid wood test table, a 2.01.0m1.2mm thick galvanized steel plate; 3m2m, thickness: 1.2mm, a set of hinged ground reference boards; 2 meters of copper braid 1 grounding wire; 2 grounding copper noses; 4 sets of M8 wing nuts, bolts (length 25mm), and flat gaskets; two pieces of EPE pearl cotton 11050*5cm	Wisdom/China

4. System connection diagram - three-phase 32A

5. Typical configuration - three-phase 32A

Voltage drop immunity test system [according to IEC 61000-4-11/GB T 17626.11]
serial number	product	illustrate	brand
1	PFS 503N32	3-phase voltage drop simulator 3*480V / 32A	EMTEST/ Switzerland
2	MV 3P4032DS	Three-phase autotransformer 3 x (0 - 260V) / 32A, 50/60Hz	EMTEST/ Switzerland
3	iec.control	Remote control and report generation software to control a test device, suitable for UCS, EFT, VCS, PFS, TSS and other test devices	EMTEST/ Switzerland
4	EMS-TAB	EMS test environment, including test table, horizontal coupling board, insulation support, etc. Specifically includes a 2.021.020.8m solid wood test table, a 2.01.0m1.2mm thick galvanized steel plate; 3m2m, thickness: 1.2mm, a set of hinged ground reference boards; 2 meters of copper braid 1 grounding wire; 2 grounding copper noses; 4 sets of M8 wing nuts, bolts (length 25mm), and flat gaskets; two pieces of EPE pearl cotton 11050*5cm	Wisdom/China

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