博文

目前显示的是 六月, 2019的博文

Why do people like to talk about power quality nowadays

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Nowadays, many people like to talk about “power quality”. There are many products of power quality, such as  SVG ,  APF and three-phase unbalanced regulator, which have become “hot-selling products”. But what are the benefits of improving power quality for people? Improving power quality is of great significance to the safe and economic operation of power grid, ensuring the quality of industrial products and the normal conduct of scientific experiments, and reducing energy consumption. Power quality is directly related to the overall benefits of the national economy. Good power quality is undoubtedly beneficial to the operation of electrical equipment, but the adverse impact of poor power quality on the operation of power system has not attracted enough attention. From the point of view of harm degree, the harm of some power quality problems is destructive. For example, the overvoltage caused by harmonic resonance in lightning impulse, capacitor and cable switching often causes

Fault area of outdoor cabinet

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In the fault area of the  outdoor cabinet , the cabinet is usually made of cold rolled steel or alloy, which is used to store computer and related control equipment. It can provide protection for storage equipment, shield electromagnetic interference, arrange equipment in an orderly and orderly manner, and facilitate the maintenance of equipment in the future. Cabinet is generally divided into server cabinet, network cabinet, console cabinet and so on. As the user of cabinet, you must know the fault area of cabinet. Fault area 1: below the cabinet (outside the cabinet) The area below the rack and above the floor is difficult to manage because leveling bolts or casters vary in size and manufacturer and height. There will be a lot of uncontrolled air in this area. If the area can be properly sealed, it can produce very high benefits. Usually, there is no solid baffle under the cabinet due to the need to connect wires or nets. This will also lead to air leakage in the area, because

Development of Active Power Filters

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With the progress of power electronics technology and control technology, domestic  active harmonic filter  has replaced imported products in various major projects. In 2012 alone, the sales of domestic APF products have exceeded the imported brands by five times. Active power filter will eventually replace the traditional passive filter because of its huge technological advantages, powerful functions and declining price. During the development of APF, modular APF equipment has gradually replaced traditional cabinet APF with its advantages of small size, convenient installation, high integration, stable operation and convenient expansion. In the next five years, the combination of modular APF and  static var generator  (SVG) will become the most powerful solution in power quality industry, and will be widely recognized by the market. Three-phase Balance Active Harmonic Filter(AHF) Meeting users’ requirements: – PF=0.99 and THDi < 5% – Compensation for 2- to 50-order harmoni

Principle of Solar Charge Controller

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Solar panels belong to photovoltaic devices (mainly semiconductor materials), which produce current by photoelectric effect after irradiation by light. Because of the properties and limitations of materials and light, the generated current is also a wavy curve. If the generated current is directly charged into the battery or directly supplied to the load, it will easily cause damage to the battery and load, and seriously reduce their life. Therefore, we must first feed the current into the  solar charge controller , use a series of special chip circuits to digitally adjust it, and add multi-level charge and discharge protection to ensure the operation safety and service life of the battery and load. When power is supplied to the load, the current of the storage battery is first flowed into the solar charge controller, and then into the load after its adjustment. The purpose of this method is to stabilize the discharge current, to ensure that the battery is not over-discharged, and to