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Dec 18,2020
Introduction From ZDDQ professional engineers: Power systems are designed to operate at frequencies of 50 or 60Hz. However, certain types of loads produce currents and voltages with frequencies that are integer multiples of the 50 or 60 Hz fundamental frequency. These higher frequencies are a form of electrical pollution known as power system harmonics. Solution ZD-APF(Active Power Filter). This i...
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Jan 05,2021
Power factor correction capacitor banks and harmonic filters. Power factor correction capacitors and harmonic filters are an essential part of modern electric power systems. Power factor correction capacitors are the simplest and most economical means of increasing the capacity of any power system, minimizing energy losses and correcting load power factor. In addition, power factor penalties can b...
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Jan 27,2021
Overview ZDDQ Active Power Filter have exported to many countries all over the world. These filters are widely used in a number of industries such as oil & gas, manufacturing, water/wastewater, metal and mining, and paper and pulp. A harmonic filter is used to mitigate harmonics created by non-linear loads in electrical equipment. Classification Ⅰ. Product Insights Based on product type, ...
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Feb 02,2021
Harmonics in power system. In an electric power system, a harmonic is a voltage or current at a multiple of the fundamental frequency of the system, produced by the action of non-linear loads such as rectifiers, discharge lighting, or saturated magnetic devices. Harmonic frequencies in the power grid are a frequent cause of power quality problems. Harmonics in power systems result in increased hea...
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Feb 18,2021
To all clients and friends, 2021 is Chinese Niu Year and Happy Chinese New Year. Best wishes to all our friends and clients from all over the world. Happy new year 2021 wishes for friends families. Warmest thoughts and best wishes for a Happy New Year. May peace, love, and prosperity follow you always. We have resume work On Feb 18th. Going on supporting power quality solutions Low voltage capacit...
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Feb 27,2021
Introduction to Active Harmonic Filter Suitable to be fitted within large installation systems, Active Harmonic Filters are used to eliminate, or at least mitigate, harmonics experienced from power received from the Australian national grid. The electricity which is delivered to a property is not necessarily ‘clean’ and therefore properties can experience harmonics. Harmonic currents lead to power...
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Mar 04,2021
ZDDQ Active Harmonic Filter Active Harmonic Filter is a perfect comprehensive solution to power quality problems with power grid such as harmonic wave, reactive power, and three-phase load unbalance. ZD-AHF-4 active harmonic filter is connected in parallel in 380V~456V power grid, to detect the harmonic wave in power grid in real time, generate the reverse-phase compensation current through the co...
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Mar 11,2021
Basic Datas of Harmonics and VFD Harmonic Distortion Harmonic Distortin is a measure of the amount of deviation from a pure sinusoidal wave form that can be caused by a non-linear load (a VFD is considered a non-linear load because it only draws current from the power line as required). Distorted Waveform Distorted Waveform = fundamental (50Hz sinusoidal waveform) + multiples of the fundamental fr...
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Mar 19,2021
Problems of Line Side Harmonics The two main line side harmonic concerns are the problems caused in the facility where they are being generated and the degree of harmonic infection passed to neighboring facilities. The degree of impact for either area depends on the number, size and frequency of use of all linear and non-linear loads . Mainly introduce harmoncs within a facility here. Within a fac...
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Mar 30,2021
Why harmonics analysis? When a voltage and/or current waveform is distorted, it causes abnormal operating conditions in a power system such as: Voltage Harmonics can cause additional heating in induction and synchronous motors and generators. Voltage Harmonics with high peak values can weaken insulation in cables, windings, and capacitors. Voltage Harmonics can cause malfunction of different elect...
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May 18,2021
Harmonics and Active Power Filter In recent years, the use of non-linear load is increasing day by day. Non-linear loads such as traditional diode/ thyristor rectifiers with inductive load generate harmonic and reactive current, which leads to poor power factor, low energy efficiency, and harmful disturbance to other appliances. Also, in recent years, the large-scale use of the power electronic eq...
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May 31,2021
Power Qaulity Issue Power quality issues can increase your utility and operating costs. In a 3-phase power system, any disturbance on one parameter (magnitude, frequency, waveform, or symmetry) is classified as a power quality problem. Even minor disruptive voltage fluctuations can cause major issues from equipment malfunctions, to flickering lights, to complete power shutdowns. Power quality prob...
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Jun 07,2021
Energy consumption pattern The energy pattern given in below table is helpful in understanding the way energy is used in a foundry and helps to control energy cost by identifying areas where waste can occur and where scope for improvement may be possible. It is observed that melting consumes a major portion of total energy consumed. SN Sections Energy Consumption 1 Melting(Furnance) 70% 2 Molding ...
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Sep 07,2021
Formulas of Related Harmonics The following calculator computes the total harmonic current distortion (THDc or THDi), Peak Current, RMS Current, and Crest Factor based on individual harmonic current distortion values between the 1st and the 50th harmonic. Input the fundamental current and individual harmonic currents to compute THDc(THDi) also to view a waveform plot based on the input values. The...
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Oct 28,2021
ZDDQ-AHF Active Harmonic Filter ZDDQ Active Harmonic Filter(AHF) is used to improve Power Quality through autonomous detection and dynamic filtering of harmonic currents present in power grid. ZDDQ Active Harmonics Filter is a perfect comprehensive solution to power quality problems with power grid such as harmonic wave, reactive power, and three-phase load unbalance. ZD AHF is connected in parall...
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Nov 05,2021
ZDDQ Active Harmonic Filter(APF/AHF for short) is a perfect comprehensive solution to power quality problems with power grid such as harmonic wave(can filter 2nd to 50th harmonic interference completely), reactive power, and 3 phase load unbalance. Active Harmonic Filter is connected in parallel in power grid, to detect the harmonic wave in power grid in real time, generate the reverse-phase compe...
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Nov 22,2021
Reliable power distribution is needed to guarantee patient health and save lives in hospital. Continuity and reliability of power supply are extremely important in hospital.UPS,Generator,Medical devices include high volume of harmonics current, and can impact the distribution system in hospital. ZDDQ Active Harmonics Filter Based on the broad knowledge and experience in terms of solutions and appl...
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Dec 04,2021
ZDDQ Active Harmonic Filter Active harmonic filter is connected in parallel with non-linear loads, and uses one set of CT to detect the load current. It calculates each order harmonic current by FFT algorithms in its DSP microchips, and then generates a compensating current with the same amplitude but opposite phase angles to the detected harmonic current, which cancels out the original load harmo...
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