Harmonic flicker test
  • Harmonic flicker test

Harmonic flicker test


Strictly speaking, the harmonic refers to the electric quantity contained in the current whose frequency is an integer multiple of the fundamental wave, and generally refers to the Fourier series decomposition of the periodic non-sinusoidal electric quantity, and the electric quantity generated by the current whose frequency is greater than the fundamental wave frequency.

What is harmonic current?

In a broad sense, since the effective component of the AC power grid is a single frequency, any component that is different from the power frequency can be called a harmonic. At this time, the meaning of the word "harmonic" has become somewhat inconsistent with the original meaning. It is precisely because of the generalized concept of harmonics that there are "fractional harmonics", "inter-harmonics", "sub-harmonics" and so on.

Causes of harmonics:

Since the sinusoidal voltage is applied to the nonlinear load, the fundamental current is distorted to produce harmonics. The main nonlinear loads include UPS, switching power supply, rectifier, frequency converter, inverter, etc.

harmonic current hazards:

1, reduce the system capacity such as transformers, circuit breakers, cables, etc.; Accelerate the aging of equipment, shorten the service life of equipment, and even damage the equipment;

2, endanger production safety and stability;

3, waste of electricity, etc.

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Content and Technology of Harmonic Current Test

Harmonic current test basis standard

IEC 61000-3-2/GB 17625.1: Limits for harmonic currents emitted by low-voltage electrical and electronic equipment (equipment input current ≤ 16A per phase);

Harmonic current in the field of electromagnetic compatibility

The (power grid) harmonic current studied in the field of electromagnetic compatibility (EMC) refers to the sinusoidal current component of a multiple of the nominal power frequency of the power supply grid, such as the power grid frequency f = 50Hz, the second harmonic f = 100Hz, the third harmonic f = 150Hz, the fourth harmonic f = 200Hz, etc. The harmonic current frequency range studied is generally 2 to 40 times, assuming that k is an integer starting from 2, the sinusoidal component of the fundamental k-octave is called the k-th harmonic, and the harmonic is actually a disturbance that "pollutes" the power grid ".

Tianhai Inspection Technical Service Support

Tianhai detection adopts the latest AMETEK CI harmonic test system, which can fully meet the test of A,B,C and D products. It also supports the latest version of the harmonic standards such as the EN IEC 61000-3-2:2019 standard.

Tianhai testing capability advantage

Tianhai Testing has a testing and certification testing laboratory and a relatively comprehensive qualification. Whether it is product pre-testing or certificates or reports, we can test and issue certificates in time.

Tianhai Testing has professional rectification engineers. If the product fails the test, our rectification engineers can provide technical support and suggestions. Ensure that the product passes the rectification once.

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Tianhai testing is set up and operated in accordance with the laboratory accreditation system specification ISO 17025. The testing instruments are made up of Germany's Rohde & Schwarz, Switzerland's EMTEST, YYOKOGAWA, Agilent, Tektronix and other world's top instrument manufacturers. The equipment is advanced and sophisticated, the site environment control is reliable, traceability is strong, the technical team is senior and efficient, and close cooperation with international authoritative organizations is maintained.

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