Harmonic Testing；What is the significance of harmonic detection and the role of harmonic tester

1. The significance of harmonic detection:

Through professional testing of power quality, we can fully and accurately understand the operation of the entire power supply network system, and can quantitatively analyze the harmonic content, active power usage, reactive power loss, power factor, voltage changes, flicker interference, and three existing power grid systems in the enterprise. Phase imbalance and other specific parameter indicators, input various parameters into the supporting power quality analysis software to form a complete power quality analysis report, which can not only accurately reflect the "health" status of the entire power grid system, but also diagnose the impact on energy saving Based on the problem of power reduction and the extent to which it can be optimized and managed, engineering and technical personnel can provide implementation plans for harmonic control, reactive power optimization, dynamic compensation, etc. to help enterprises achieve safe and stable operation of the power grid system and energy conservation and consumption reduction. The development goal is to promote the reduction of enterprise energy consumption costs and the improvement of economic benefits!

2. The necessity of harmonic testing and evaluation

Whether it is to thoroughly control the harmonics in the system or to perform harmonic isolation and purification of key equipment, it is necessary to understand the specific data of the harmonics in the system, so that we can accurately analyze the effect of harmonic isolation and purification or the accurate cost and price of harmonic control equipment. Therefore, it is more reasonable for users to conduct harmonic testing first and then determine the specific implementation plan.

Because each user unit has a different decision-making mechanism for harmonic control. Units where harmonics directly interfere with the operation of the production line attach more importance and urgency to the control work. Normally, the main leader of the unit determines to carry out control as soon as possible, and then personally or arranges for the power equipment to be responsible. people to contact and implement relevant matters. However, the harmonic interference existing in some user units has not affected normal production and operation. There are only some accidental faults or potential hazards. The unit leaders have not paid enough attention to it. It is just that the power equipment department wants to make some attempts to understand. , it is difficult to determine when the treatment will be carried out, so it is also difficult for manufacturers that provide professional harmonic control services to grasp the progress of the project. It often happens that a lot of technical work has been done, but the harmonic control project cannot be promoted.
3. Function of harmonic testing instruments

Harmonic testing instrument: refers to the instrument used to detect harmonics, also called harmonic detector, also called harmonic analyzer. Most harmonic measurement instruments use the Fourier transform method to measure harmonics. The premise of using Fourier transform for harmonic analysis is that the waveform being analyzed must be a periodic waveform, that is to say, only integer harmonics can be measured using Fourier transform. Very few harmonic detectors can detect fractional harmonics. Fourier transform cannot be used to measure fractional harmonics. The specific methods of measuring fractional harmonics vary from manufacturer to manufacturer, and almost all of them are imported products and developed domestically. There is currently only one harmonic detector that can measure fractional harmonics.
The harmonic detector is an instrument that monitors harmonic energy in the power system. The functions are receive/receive control function and communication mode selection function. When the voltage or current waveform in the power grid is not an ideal sine wave, it means that it contains voltage or current components with a frequency higher than 50Hz. We call current or voltage components with a frequency higher than 50Hz harmonics. When the harmonic frequency is an integer multiple of the power frequency, we call it an integer harmonic. Such harmonics are usually expressed in terms of order. For example: a harmonic whose frequency is 5 times the power frequency (250Hz) is called the 5th harmonic, a harmonic whose frequency is 7 times the power frequency (350Hz) is called the 7th harmonic, and so on. Most of the harmonics generated by nonlinear loads are integer harmonics. When the harmonic frequency is not an integer multiple of the power frequency frequency, we call it fractional harmonics. Such harmonics are usually represented directly using harmonic frequencies.

Harmonic current and voltage tester The harmonic current and voltage tester is a clamp-type CT tester with model number HWT-301.
Features

1. Simple and convenient test, comprehensive ~25th harmonic, true RMS current and voltage

2. High-precision clamp CT can be used as a leakage ammeter

3. Easy to make, lightweight and low price