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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 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
Typical non-linear loads We will be focusing on the six pulse rectifier bridge. The 3 phase rectifier has a key role to play because a significant portion of the electrical energy is drawn from loads with this type of front-end circuit. One typical application that can be mentioned is the variable speed motor drive, which has been used for years with high growth rates in almost every industrial se...
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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 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 18,2019
Single busbar compensation Overview An installation with a single LV busbar is that most often encountered. This type of installation requires that the reactive power can change with respect to the methods defined previously. Compensation uses all the receiving devices of the installation and the amperage of the current transformer is determined according to the total current conducted through the...
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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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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 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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