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Sep 19,2019
Anhui Zhongdian(ZDDQ) Electric Co., Ltd. established in 2001. ZDDQ Technology Park locates in Bengbu City of Anhui Provice. We're a professional and leading manufacture, focus on advanced power quality solutions and power factor correction. APF,SVG,APFC are our main products. ZDDQ have a leading independent R&D team and quality supervision system, and maintain long-term cooperative relations w...
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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 22,2019
STATCOM/SVG INTRODUCTION Static Synchronous Compensator STATCOM (SVG) is one of the core equipment FACTS (Flexible Alternative Current Transmission Systems).The system can quickly compensate reactive, and take effective governance for harmonics, voltage fluctuations and flicker and other power quality problems, improve the safety and reliability of the system. With the limits of the IGBT can withs...
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Nov 22,2019
Based on the power of a receiver in kW, this table can be used to calculate the power of the capacitors to change from an initial power factor to a required power factor. It also gives the equivalence between cosΦ tanΦ，
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Nov 22,2019
In an L.V/M.V/H.V electrical installation, capacitor banks (or Static var generator/Active harmonic filter)can be installed at 3 different levels. 1.Global installation Advantages: - No reactive energy bill. - Represents the most economical solution since all the power is concentrated at one point and the expansion coefficient makes it possible to optimize banks - Relieves the transformer. Remark:...
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Nov 23,2019
Rated insulation level The combination of voltage values that characterizes the insulation of the equipment with regard to its capability to withstand dielectric stresses. These values are selected based on the rated voltage of the bank/system. Standard insulation values are given for altitudes <1000 m above sea level. For higher altitudes, a correction factor must be used. Lightning impulse te...
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Nov 23,2019
Capacitor element Device consisting essentially of two electrodes separated by a dielectric (IEV 436-01-03). Capacitor unit Assembly of one or more capacitor elements in the same container with external terminals (IEV 436-01-04). Capacitor bank Multiple capacitor units connected so as to act together (IEV 436-01-06). Capacitor The word “capacitor” is used when it is not necessary to put particular...
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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 10,2019
What is Static Var Generator? Static Var Generator (SVG) also known as instantaneous stepless reactive power compensators or active power factor compensators (APFC),are the ultimate solution to power quality problems caused by low power factor and reactive power demand for a wide range of segments and applications. SVG is a high performance, compact, flexible, modular and cost-effectiv...
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Dec 19,2019
Method for determining compensation (Power Factor correction Guidelines) Step 1 Selection of the compensation mode The location of L.V capacitors banks in an installation constitutes the mode of reactive power compensation, which may be central (one location for the entire installation), by sector or group (section-by-section), at load level, or some combination of the latter two. In principle, th...
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Dec 19,2019
Method for determining compensation (Power Factor correction Guidelines) Step 2 Selection of the compensation type Different types of compensation should be adopted depending on the performance requirements and complexity of control: Fixed, by connection of a fixed-value capacitor bank Automatic, by connection of a different number of steps, allowing adjustment of the reactive energy to the requir...
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Dec 19,2019
Method for determining compensation (Power Factor correction Guidelines) Step 3: Allowance for operating conditions and harmonics Capacitor banks should be selected depending on the working conditions expected during their lifetime. Allowing for operating conditions The operating conditions have a great influence on the life expectancy of capacitors. The following parameters should be taken into a...
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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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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 03,2020
Compared with SVC, SVG is superior to SVC in the following aspects: SVG: Static Var Generator(also as know static synchronous compensator or Statcom) SVC: Static Var Compensator 1. Advanced working principle (1)Static Var Compensator can be seen as a dynamic source of reactive power. According to the requirements of accessing the grid, it can provide capacitive reactive power to networks, and...
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Jan 04,2020
SVG Principle The principle of the SVG is, when the load is generating inductive or capacitive current, it makes load current lagging or leading the voltage. SVG detects the phase angle difference and generates leading or lagging current into the grid, making the phase angle of current almost the same as that of voltage on the transformer side, which means fundamental power factor is unit. Compare...
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