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Power frequency magnetic field immunity

1. Introduction to the test　　

The power frequency magnetic field is generated by the power frequency current in the conductor near the equipment or the disturbance generated by the leakage of the nearby transformer. For the power frequency magnetic field generated by the nearby conductor, it can be divided into two cases: under normal operating conditions, a stable magnetic field is generated, and the amplitude The value is small; the current under fault conditions produces a magnetic field with a higher amplitude and a shorter duration, which may cause protection devices such as fuses to operate.

--The stable magnetic field test is suitable for various forms of electrical equipment in public or industrial low-voltage power distribution networks or power plants.

--The short-term magnetic field test requirements under fault conditions are different from the test levels for stable magnetic fields, and the highest level is mainly used for equipment installed in power facilities.

The waveform of the test magnetic field is a sinusoidal waveform of power frequency.

Pulsed magnetic fields are mainly generated by lightning strikes to buildings and other metallic structures (including antenna masts, grounding bodies and grounding grids) and by incipient transients of faults in low-voltage, medium-voltage and high-voltage power systems.

In the high-voltage substation, the pulsed magnetic field can also be generated by the circuit breaker cutting the high-voltage bus and high-voltage lines.

Pulse magnetic field waveform: 6.4/16μs, corresponding to surge test 8/20μs waveform

When the laboratory simulates power frequency magnetic field and pulse magnetic field test, the corresponding voltage signal is generated by the signal source, and the signal is transmitted to the 1m x 1m magnetic field coil through the current transformer, thereby generating a standard magnetic field for testing.

2. System connection diagram

3. Typical configuration

Power Frequency Magnetic Field Immunity Test System【Based on IEC 61000-4-8/GB T 17626.8】
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	MFC1000	Field coil, 1mx1m, conforms to EN 61000-4-8 and IEC 61000-4-9	EMTEST/ Switzerland
4	MFT30	Current transformers for field coils 0-30A (short-term 50A)	EMTEST/ Switzerland
5	MFT100	Current transformers for field coils, 100A continuous (1000A short-term)	EMTEST/ Switzerland
6	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
7	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	Century Huize/China

Century Wisdom (Suzhou) Testing Technology Co., Ltd

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