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May 06,2024
What is nonlinear load? A nonlinear load is a load whose current is not proportional to its voltage. Since some electronic components, such as transistors and diodes, exhibit nonlinear characteristics when operating, in actual power consumption, some electrical equipment connected to the load will deform the current waveform. This deformation causes the voltage to distort and generate additional f...
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May 13,2024
The improvement of power quality is mainly through power quality equipment and current signal and other parameters in the current transformer detection system, so as to correctly control the power quality problem in real time and improve the environment of the distribution system. For capacitor bank, we usually only use a CT mounted on the power side for sampling. For SVG / APF, a...
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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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Jul 01,2024
STATCOM (Static Synchronous Compensator) is a power electronic device used power systems for voltage control and power factor correction. While Statcom are not directly related to coal mining operations, they can play a role in providing stable and reliable electrical power for mining operations, including coal mines. Coal mines typically require a significant amount of electrical power for variou...
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Jul 01,2024
First of all, the operation of inductive equipment must establish a magnetic field (such as a motor). Since the instantaneous start-up of large equipment requires the power grid to provide a large amount of Reactive Current to establish a magnetic field, the voltage of the system will be greatly reduced at the moment of equipment startup, causing other equipment to be protected or unable to operat...
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Jul 09,2024
In the power system, the on-site compensation of high-voltage motors should be invested when the voltage drops by more than 10%. 1. The role of on-site compensation of high-voltage motors The on-site compensation of high-voltage motors can effectively improve the power factor of the power system, reduce line losses, ensure the stable operation of the system voltage, and reduce energy consumption a...
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Jul 16,2024
STATCOM and Voltage Flicker Mitigation What is votlage flicker? Voltage flicker refers to the rapid and repeated fluctuations in the voltage level of a power supply, which can cause noticeable changes in the intensity of lighting and can affect the performance of other electrical equipment. These fluctuations can be annoying and may lead to operational issues in sensitive equipment Causes of Volta...
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Jul 22,2024
Statcom, Current sampling and voltage sampling Current and Voltage Sampling in STATCOM Static Synchronous Compensator (STATCOM) is a device used for dynamic reactive power compensation and voltage stabilization in power systems. Accurate current and voltage sampling are crucial for the proper functioning of STATCOM, ensuring it provides the necessary reactive power compensation and voltage regulat...
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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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Aug 28,2024
Medium voltage power factor correction Medium Voltage Power Factor Correction (MV PFC) involves the application of devices and systems designed to improve the power factor in medium voltage electrical networks, typically in the range of 1 kV to 35 kV. Power factor correction at medium voltage is crucial for enhancing the efficiency of electrical power distribution, reducing losses, and avoiding pe...
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Sep 02,2024
Dynamic reactive power compensation Dynamic Reactive Compensation refers to the real-time adjustment of reactive power in an electrical system to maintain optimal voltage levels, improve power factor, and enhance overall power quality. It is essential in modern power systems, particularly in environments where loads fluctuate rapidly or where maintaining a stable voltage is critical. 1. Understand...
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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 11,2024
Selecting the capacity of the transformer is crucial, as it directly affects the stability, efficiency and safety of the power system. The appropriate transformer capacity can ensure that current and future load requirements are met, avoiding equipment damage and energy waste caused by overload or underload. The correct capacity selection helps optimize operating costs, extend equipment life, and ...
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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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Sep 30,2024
Notice All departments of the ZDDQ: In light of the actual situation of the company, arrangements are now made for the National Day holiday in 2024, as follows： Take a 7-day holiday from October 1 to October 7. Work as usual on October 8. Pay attention to safety during the holidays, and wish you all a happy holiday.
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