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相关概念视频

Conservation of AC Power01:15

Conservation of AC Power

327
The principle of power preservation is applicable to both ac and dc circuits. This principle, when applied to AC power, asserts that the complex, real, and reactive powers produced by the source are equal to the total complex, real, and reactive powers absorbed by the loads. When two load impedances are connected in parallel to an ac source V, the complex power provided by the source can be calculated using the relation
327
Power Factor Correction01:20

Power Factor Correction

157
The power transmission to a factory involves the transfer of apparent power, a combination of active and reactive power. The power factor measures how effectively electrical power is converted into useful work output. The ratio of the real power (KW) that does the work to the apparent power (KVA) supplied to the circuit.
157
Electrical Energy01:10

Electrical Energy

1.2K
Using electric appliances for a longer period of time consumes more electrical energy and results in a higher electric bill. The energy produced by the transfer of electrons from one point to another is known as electrical energy. If power is delivered at a constant rate, the electrical energy can be defined as the product of power used by the device for a period of time. The energy unit on electric bills is the kilowatt-hour, where one kilowatt-hour is equivalent to 3.6 × 106 joules.
1.2K
Power Factor01:11

Power Factor

373
The power factor is defined as the ratio of average (or active) power to apparent power, as illustrated by the relation
373
Reclosers and Fuses01:26

Reclosers and Fuses

87
Automatic circuit reclosers enhance the protection of distribution circuits by interrupting and auto-reclosing an AC circuit according to a preset sequence. They effectively manage temporary faults on overhead distribution lines, often caused by tree limbs or wildlife, by briefly disrupting service to improve overall reliability. However, contact with reclosers or energized broken conductors on the ground can pose serious hazards.
A comprehensive protection scheme for radial distribution...
87
Radial System Protection01:23

Radial System Protection

89
Radial systems employ time-delay overcurrent relays to reduce load interruptions. When a fault occurs, the nearest breaker opens first, while upstream breakers remain closed due to longer delay settings. This approach ensures minimal disruption to the rest of the system.
In a radial system with a fault downstream of the third breaker, ideally, only the third breaker will open, isolating the fault and interrupting the load connected beyond it. The second breaker has a longer delay setting,...
89

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相关实验视频

Updated: Jun 7, 2025

Author Spotlight: Optimization of Airflow Velocities in Battery Cooling Systems for Enhanced Thermal Performance and Reduced Energy Consumption
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智能家居的射频节能系统 智能家居的射频节能系统

Martynas Sapurov1,2, Algirdas Baskys1,2, Kazimieras Slivka2

  • 1State research institute Center for Physical Sciences and Technology, Sauletekio av. 3, LT-10257 Vilnius, Lithuania.

Heliyon
|November 11, 2024
PubMed
概括
此摘要是机器生成的。

从Wi-Fi信号中收集射频 (RF) 能量可以为智能家居传感器提供动力. 最佳收获需要特定的距离和定向天线,特别是在较低的功率水平.

关键词:
定向天线 定向天线节能采集 节能采集 节能采集节省电力的RF电源节约器传感器 传感器 传感器智能家居是一个智能家居.系统系统 系统系统

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相关实验视频

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科学领域:

  • 电气工程 电气工程
  • 无线通信无线通信
  • 收集能源 收集能源

背景情况:

  • 智能家居设备需要电力,通常依赖于需要更换的电池.
  • 收获无线电频率 (RF) 能量为低功耗电子产品提供了潜在的替代电源.
  • 无线网络信号无处不在,是环境射频能量的潜在来源.

研究的目的:

  • 调查采集2.4 GHz Wi-Fi信号为智能家居泄漏传感器供电的可行性.
  • 为了确定有效收获射频能量的极限输出功率和距离.
  • 设计和测试一个合适的射频能量收集系统和天线.

主要方法:

  • 设计了一个基于PCB的Yagi-Uda天线用于RF信号接收.
  • 开发了一种射频能量收集系统,以捕获和存储能量.
  • 用信号发生器和Wi-Fi路由器在各种距离和功率级别上测试了系统.

主要成果:

  • 在典型的Wi-Fi路由器功率水平 (10-17 dBm) 时,RF能量采集是可能的,但仅在几十厘米的范围内.
  • 使用最大允许功率路由器 (20dBm) 和定向Yagi-Uda天线,收获距离扩展到120厘米.
  • 能量采集的效率高度依赖于信号强度和天线导向性.

结论:

  • 从Wi-Fi收集射频能量对于低功耗传感器是可行的,但范围有限.
  • 定向天线显著提高收获效率和范围.
  • 进一步的研究可以优化系统,以适应更远的距离和更低的电源.