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Nov 21,2019
ZDDQ power quality correction products are part of the solution. Most utilities charge for peak electrical demand on each month’s electrical bill. The demand charge is to allow the utilities to recoup part of their capital investment in the distribution network they operate. Each customer pays a demand charge for its peak operating load. Often inherent in the structure of these demand charges is a...
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Nov 23,2019
Fundamental (component) The component of order 1 of the Fourier series of a periodic quantity. (IEV 161-02-17) Harmonic The component of the Fourier-series decomposition of a volt- age or current periodic wave. (IEV 161-02-18 modified) Harmonic order (h) The ratio of the frequency of a harmonic (fh) to the fundamen- tal (rated) network frequency (f1). (IEV 161-02-19 modified) Odd harmonics Harmoni...
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Nov 28,2019
Standard Features Enclosure ZDDQ Capacitor banks,free standing, compartmentalized, all welded, galvanneal steel construction with 3 point pad-lockable latching handles and stainless steel hinges. The enclosure is painted with a corrosion resistant ANSI gray-61 epoxy paint. NEMA 3R construction is standard; NEMA 12 and 4X are available as an option. Base of enclosure as well as capacitor supports a...
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Nov 29,2019
Industry background Chemical industry involves many mechanical processes with demanding quality requirements. Before any mechanical smelting, casting, or stamping, an induction melting furnace is used to melt metal. Most induction melting furnaces use a 6-pulse or 12-pulse rectifier, which produces high volumes of harmonic and reactive power. As a result, the production efficiency of induction mel...
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Dec 05,2019
What's the Definition of Power Factor? Power Factor Definition: Power factor(PF for short) is the ratio between KW and KVA drawn by an electrical load where the KW is the actual load power and the KVA is the apparent load power. It is a measure of how effectively the current is being converted into useful work output and more particularly is a good indicator of the effect of the load current on th...
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Dec 07,2019
Active Harmonic Filter Active Harmonic Filter has many potential applications where its use can offer plenty of benefits. Active Harmonic Filters have been proven to provide lowered disturbances, lower carbon dioxide emissions through improved energy efficiency, lower current consumption and increased production stability to name a few. Just as other technology has evolved, so have various product...
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Dec 23,2019
The Graph below shows Harmonic Current Distortion in the form of THDi. This is hovering between 20 and 25%. Ideally, it should be less than 10% and preferably less than 8% THDi. The highest value of average total harmonic distortion (THDi%) across three phases was calculated from raw data. This value is 24.19%THDi and was recorded at time shown. At the same time, average line current (Amps) across...
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Dec 25,2019
We make a simple introduction about harmoincs in networks,welcome to communicate with us about harmonics and how to solve. General Introduction Harmonics are usually defined by two main characteristics: Their amplitude: value of the harmonic voltage or current. Their order: value of their frequency with respect to the fundamental frequency (50 Hz). Under such conditions, the frequency of a 5th ord...
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Jan 02,2020
The effects of harmonics on loads The following two types of effects appear in the main equipment: immediate or short-term effects and long-term effects. Immediate or short-term effects: Unwanted tripping of protection devices, Induced interference from LV current systems (remote control, telecommunications), Abnormal vibrations and noise, Damage due to capacitor thermal overload, Faulty operation...
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Jan 19,2020
A changing electrical network brings new power quality issues. Today the way we generate, use, and control our energy is changing. New and renewable generation and distribution technology is becoming common, and combined with more dynamic and complex load profiles, there are more challenges faced by the network and energy users to provide high power quality. A new way to improve your power quality...
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Feb 01,2020
To our clients, You may have had some good memories about the past one, but you never know what’s the new one is bringing for you. It's time to be hopeful, have new dreams and make some new resolutions for the new year in your life. It's time to connect with each other and make new year wishes. Its time to move on and embrace what’s new. New year means a lot of new dreams and new achievements. Peo...
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Feb 04,2020
Industry background Chemical industry involves many mechanical processes with demanding quality requirements. Before any mechanical smelting, casting, or stamping, an induction melting furnace is used to melt metal. Most induction melting furnaces use a 6-pulse or 12-pulse rectifier, which produces high volumes of harmonic and reactive power. As a result, the production efficiency of induction mel...
read more
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Feb 10,2020
WHAT IS HARMONIC FILTERING? To understand the purpose of harmonic filtering, it helps to understand what harmonics are. The voltage of a standard 50Hz Alternating Current(AC) power supply swings between positive and negative 50 times a second, following a neat sine-wave. Linear AC electrical loads such as heaters or incandescent lights draw a current that follows this same sine-wave. The graph abo...
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Feb 12,2020
A capital investment in power factor correction(STATCOM or SVC) and harmonic filtering equipment can result in a healthy return of investment –depending on the utility’s demand rate structure, production quality cost due to harmonics and voltage fluctuations in the distribution system. ZDDQ Electric power quality correction products are part of the solution. Most utilities charge for peak electric...
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Feb 25,2020
ZDDQ has come back to factory and start to work Since Feb.18th. The factory will carry out the strict measures to maintain the normal production to meet clients' orders. In 2020, we will focus on low voltage and medium voltage power qualit improvement and power factor correction. In low voltage field, we will push on R&D of Active power filter, and provide perfect service for clients.We have b...
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Mar 11,2020
Product Description ZDDQ Medium Voltage Metal Enclosed Capacitor and Harmonic Filter Banks are designed for industrial, commercial, and utility power systems requiring medium voltage automatic power factor correction. Standard designs are available for placement in outdoor or indoor substations (an enclosure integrity option can be added to allow for placement in publicly accessible areas) for pow...
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Mar 17,2020
China's economy According to China Daily China's economy is gradually returning back to normal, as major industrial companies outside of Hubei province have resumed work at a rate of more than 90 percent, China's top economic regulator said on Tuesday. The nonferrous metal industry's electricity consumption has reached normal level last year, and power consumption in the medical, chemical and elec...
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Mar 23,2020
Overview of Active Power Filter APF-1000 APF-1000 Active power filter has various compensation modes (harmonic, reactive power, three-phase unbalance and capacitor switching control), which can simultaneously make the said various compensation, and the proportion of compensation capacity by harmonic, reactive power, and three-phase unbalance can also be set, comprehensively solving the problem of ...
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