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May 29,2024
Active filters and passive filters are two types of filters that are often used in electronic circuits. Although they can both be used to filter certain frequencies in electrical signals, there are some different differences between them. 1. Working Principle Passive filters mainly rely on passive components (such as capacitors, inductors, resistors, etc.) to filter signals. They can only process ...
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May 30,2024
1. What are the 3rd, 5th, and 7th harmonics? In a normal power system, electrical equipment with linear impedance change characteristics will not affect the power supply with a frequency of 50Hz and a standard sinusoidal waveform when it is working. However, with the development of power electronics technology, there are more and more electrical equipment with nonlinear impedance characteristics (...
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Jun 13,2024
When an oscillating system is subjected to periodic external force, the amplitude of the oscillation increases sharply when the frequency of the external force is the same as or very close to the natural oscillation frequency of the system. The frequency at which resonance occurs is called "resonance frequency". In electrical engineering, the resonance phenomenon of an oscillating circuit. The res...
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Aug 09,2024
690V 3 phase 3 wire networks A 690V 3-phase 3-wire network refers to an electrical power distribution system that operates at 690 volts between each line conductor, without a neutral wire. This type of network is commonly used in industrial and commercial applications where the loads do not require a neutral connection or where power is distributed primarily to large motors, equipment, or machiner...
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Aug 27,2024
Harmonic voltage and harmonic current are common phenomena in power systems, and they have a great impact on power equipment and power grid operation. Harmonics refer to voltage or current components whose frequencies are integer multiples of the fundamental frequency. In power systems, the fundamental frequency is generally 50Hz or 60Hz, so the harmonic frequency is an integer multiple of 50Hz or...
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Sep 05,2024
Application of reactive power compensation device SVG: Power system: SVG can be used for reactive power compensation and voltage regulation of power system to improve the stability and reliability of power grid. It can help power system reduce power loss, improve voltage quality, and improve power factor and efficiency of power grid. Industrial field: SVG can be used for reactive power compensatio...
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Sep 24,2024
What is the reason of resonance in power networks? Resonance in power networks occurs when the inductive and capacitive elements of the system interact in a way that amplifies specific frequencies, leading to excessive voltage or current oscillations. Here are the primary reasons for resonance in power networks: 1. Impedance Matching Resonant Frequency: Every electrical circuit has a natural reson...
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Oct 27,2024
Active Load Balancer and Active Power Filter Active Load Balancers and Active Power Filters (APFs) are both power quality devices, yet they serve different roles within electrical networks. Here’s an overview of each, along with their similarities and distinctions: Active Load Balancer Function: Primarily used to ensure balanced loading across all three phases in a power system. Operation: Activel...
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Nov 04,2024
Inverters are a type of power electronic device widely used in industrial automation. They adjust the speed of motors by changing the frequency and amplitude of the motor input voltage. Although inverters improve energy efficiency and control performance, they generate harmonics during operation, which have an adverse effect on power grids and equipment. Understanding the causes and principles of ...
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