抓饭体育直播|首页

抓饭体育直播
抓饭体育直播
抓饭体育直播
抓饭体育直播
抓饭体育直播
抓饭体育直播
抓饭体育直播

抓饭体育直播※kok795.com※提供足球直播、篮球直播、█◤英超直播、LOL、CSGO电竞赛事直播、NBA直播、CBA直播、德甲直播、西甲直播、体育赛事投注就选抓饭体育直播

News


Fan knowledge without power and power factor
Fan knowledge without power and power factor
1 no power in AC circuits, electrical power load by power supply has two kinds; one is the active power, reactive power is not a. Active power is to keep the electric power needed by electric equipment in normal operation, the electric energy is converted into other forms of energy (mechanical energy, heat energy, electric power). For example: Motor 5.5 kW to 5.5 kW of electrical energy into mechanical energy, driven pump or threshing; lighting equipment that converts electrical energy into light energy for lighting, people live and work. Active power symbol P, units of watts (W), kW (kW), MW (MW). No power is more abstract, it is used to exchange the electric and magnetic fields in the circuit, and used to power the establishment and maintenance of the magnetic field in electrical equipment in. It is not a foreign power, but changed into other forms of energy. All electrical equipment of electromagnetic coil, must establish the field, will consume less power. For example, 40 Watt fluorescent lamp, in addition to more than 40 Watt Power (ballast also need to consume a part of active power) to light, no coil power supply ballast built with an alternating magnetic field also spent about 80. Because it does not work, can be called the "no work". Wattless power symbol Q, unit is spent (Var) or kilovar (kVar). No power is never useless power, it is of great use. The motor needs to establish and maintain a rotating magnetic field, make the rotor rotate, which drives the mechanical movement, the rotor magnetic field of motor is obtained from power wattless power established. The transformer also needs no power, a transformer coil can generate a magnetic field, the two secondary coil induced voltage. Therefore, reactive power, the motor does not rotate, the transformer can not transformer, AC contactor not pull. In order to illustrate this image, we give an example: rural hydropower projects need excavating earth, earth moving with a bamboo basket filled with soil, the soil is taken as the active power, pick empty bamboo basket is no power, and not a bamboo basket, bamboo basket of earth how to no di.? in normal circumstances, electrical equipment not only has active power from the power supply, but also need to have no power from the power supply. If no power supply in the power grid, electrical equipment is not enough reactive power to establish normal electromagnetic field, then, these electric equipment can not be maintained at rated conditions, with the terminal voltage of electrical equipment can be reduced, thus affecting the normal operation of electrical equipment.
No power supply, the adverse effects of electricity, mainly displays in: (1) reduce the output active power of generator. 2) to reduce the power supply ability of transmission, substation equipment. (3) cause line voltage loss and power loss increase. (4) resulting in low power factor and voltage drop, so that the capacity of electrical equipment not give full play to the. Wattless power transmission line from the generator and the high voltage supply, far can not meet the needs of load, so set the number of idle compensation device to supplement the wattless power in the power grid, to ensure that the user needs to wattless power, so that the electric equipment can work under rated voltage. This is the network needs to be provided with no power compensation device. Power load of 2 power factor of motor, transformer, which belongs to the existing inductive resistance and inductance load. Phase inductive load voltage and current have a phase difference, usually expressed in phase angle cosine cos φ. COS is called the power factor, also called rate. Power factor is the reflection of power user electric equipment reasonable usage, energy level and an important indicator of the level of power management. The calculation formula of the three-phase power factor is: cos φ -- power factor; P -- Q -- kW; active power, no power, kVar; S -- apparent power, kV. A; U -- with the rated voltage, power equipment V; I -- by running current of electrical equipment,
Power factor is divided into natural power factor, instantaneous power factor and power factor. (1) the natural power factor: refers to the power factor of electric equipment is not installed wattless power compensation equipment, or power factor of electric equipment itself. Load nature or natural power factor depends mainly on the electrical equipment, resistive load (incandescent lamp, electric resistance furnace) of high power factor, equal to 1, and the inductive load (motor, electric welder) power factor is lower, is less than 1. 2) the instantaneous power factor: refers to the power factor is read by the power factor meter in a moment. Instantaneous power factor with the size and voltage type, load of electrical equipment and constantly changing the level of. (3) the weighted average power factor: refers to the average value of the power factor in a certain period of time. The method of improving power factor has two kinds, one is improving the natural power factor, the other is to install the artificial compensation device

【On the page】 Classification of fans 【The next page】 Glass fiber reinforced plastic fan installation and use common sense

小泽玛利亚 樱井步 苍井空 石黑京香 桃谷绘里香 白咲舞 川岛和津实 黑泽爱 樱井步 小泽爱丽丝 七濑茱莉亚 樱朱音 原千寻 若菜奈央 稻森丽奈 尾野真知子 友田真希 花野真衣 雪本芽衣 雨宫真贵 冲田杏梨 高阪保奈美 霞理沙 泽井芽衣 北野望 桃谷绘理香 橋本凉 波多野结衣 仁科百华 柚木提娜 长泽梓 大沢佑香 天海翼 前田香织 前田香织 二宫沙树 铃木里美 希崎杰西卡 麻仓优 麻美由真 原更沙 葵实野理 上原瑞穂 福山沙也加 铃木麻奈美 西野翔 神谷姬 希志爱野 琴乃 希崎杰西卡 秋元里奈 原干惠 杏树纱奈 佐藤遥希 Sato Haruki 前田香织 二宫沙树 仁科百华 樱木凛 秋元里奈 小泽爱丽丝 原纱央莉 浅井舞香 音羽雷恩 天海丽 大泽佑香 百合野もも 里美尤里娅 铃原爱蜜莉 美竹铃 吉沢明步 吉泽明步 早川濑里奈 美竹凉子 松岛枫 佐佐木希 樱井梨花 立花美凉 小泉彩 里美尤里娅 铃原爱蜜莉 美竹铃 松岛枫 佐佐木希 朝美穗香 上原结衣 纹舞兰

抓饭体育直播