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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 28,2024
The low-voltage power distribution system consists of a distribution substation (usually reducing the transmission voltage of the power grid to the distribution voltage), a high-voltage distribution line (i.e., a voltage above 1 kV), a distribution transformer, a low-voltage distribution line (a voltage below 1 kV), and corresponding control and protection equipment. Generally includes: Main equip...
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Oct 14,2024
Low-voltage capacitor cabinets are electrical equipment used in power systems. Their main function is to compensate the power factor of the power system and improve the power supply quality of the system. When installing low-voltage capacitor cabinets, the following aspects need to be noted: Installation location selection: Low-voltage capacitor cabinets should be installed in ventilated, dry, non...
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Feb 19,2025
In modern power systems, low-voltage capacitor cabinets, as an important reactive power compensation device, play an indispensable role. It can effectively improve the power factor of the power system, reduce line losses, improve the quality of power, and ensure the stable operation of the power system. Ⅰ. Working principle The low-voltage capacitor cabinet mainly realizes reactive power compensat...
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May 22,2025
The low power factor of a single-phase circuit will lead to a decrease in equipment efficiency and an increase in line loss. To control the power factor, we need to analyze the causes and take targeted measures. The following are common control methods: I. Common causes of low power factor 1. Mainly inductive loads Equipment such as fluorescent lamps, motors, transformers, etc., need to consume re...
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May 26,2025
STATCOM (Static Synchronous Compensator) can help control harmonics, but its primary function is not harmonic filtering. Here's how it relates to harmonics: 1. Primary Role of STATCOM: Reactive Power Compensation: STATCOM provides fast and dynamic reactive power support to regulate voltage and improve power system stability. Voltage Stability: It helps maintain grid voltage by injecting or absorbi...
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May 26,2025
Both capacitor banks and filter banks are used in low voltage (LV) power systems for reactive power compensation and power quality improvement, but they serve different primary purposes. 1. Low Voltage Capacitor Banks Purpose: Reactive power compensation (power factor correction) Voltage support (reduces line losses and improves efficiency) Components: Capacitors (fixed or switched) Contactors/thy...
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Jun 19,2025
In low-voltage power distribution systems (usually 400V and below), the hybrid solution of static VAR generator (SVG) and traditional capacitor compensation is a compromise between performance and cost. The following is an in-depth analysis of the advantages and disadvantages of hybrid compensation and the risk of component damage based on technical principles and application scenarios: Ⅰ. Technic...
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Sep 10,2025
1. Electrical Resonance What is Resonance? In an AC circuit, electrical resonance is a condition where the inductive reactance (X_C) become equal, canceling each other out. This leaves only the circuit resistance (X_L = 2πfL): Opposition from inductors (e.g., motors, transformers). Increases with frequency. Capacitive Reactance (f_r) This is the specific frequency where f_r = 1 / (2π√(LC)) Wh...
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Nov 04,2025
1. Energy Storage System (ESS) Battert Energy Storage System(BESS) is essentially a large-scale battery installed within the electrical grid. Primary Function: To store electrical energy and release it when needed. Key Applications in a Substation: Peak Shaving: Charging during low-demand (low-cost) periods and discharging during high-demand (high-cost) periods, reducing strain on the grid and sav...
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Apr 22,2026
Capacitor compensation cabinets can effectively improve the power factor of the power grid, save energy, and improve power supply quality. Power factor refers to the percentage of apparent power in a power grid that is used to supply active power. In the operation of a power grid, a higher power factor is desirable. If this is achieved, most of the apparent power in the circuit will be used to sup...
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Apr 30,2026
Is there a hidden trick in the electricity bill? The secret path to saving 30% on losses by improving the power factor from 0.7 to 0.95. I.The Impact, Benefits, and Improvement Principles of Power Factor: A building materials factory incurred an annual electricity cost overrun of 500,000 yuan due to a power factor of only 0.7—this is not an isolated case! During power supply, the user's power fact...
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May 13,2026
With the rapid development of power electronic devices and microelectronics technology, a large number of nonlinear electrical equipment are widely used in industrial fields such as metallurgy, steel, energy, transportation, and chemical industry. For example, electrolysis equipment, electric locomotives, rolling mill machinery and high-frequency equipment are connected to the power grid, which ma...
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May 15,2026
1.Basic Concepts and Definitions Power Quality: In a general sense, power quality refers to high-quality power supply. The power sector may define power quality as the compliance rates of voltage and frequency, as well as the annual hours of uninterrupted power supply, using statistical figures to demonstrate the safe and reliable operation of the power system. Electricity consumers may simply def...
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May 27,2026
In low-voltage power supply and distribution system design, reactive power compensation capacitor banks and harmonic filter banks are commonly used devices to improve the operating conditions of the power grid. The installation sequence of these two on the busbar directly affects the harmonic mitigation effect, the reactive power compensation operation status, and the service life of the el...
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Jun 10,2026
In electrical design, reactive power compensation cabinets are centrally installed on the low-voltage side of the power distribution room. The corresponding compensation installation capacity is marked on the drawings. However, due to the differences in the rated voltage of the capacitors, the access voltage at the compensation cabinet, and the reactance of the series reactors, the actual output c...
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Jun 17,2026
In high- and low-voltage power distribution systems, "capacitor compensation" is an indispensable technical term. Whether in factories, commercial buildings, or data centers, the capacitor compensation units housed within low-voltage cabinets act like "invisible electricians," quietly enhancing the operational efficiency of the power system. To understand capacitive compensation, one must first gr...
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Jun 26,2026
The complete process of electricity generation and use can be clearly divided into four main stages: power generation → transmission → distribution → consumption. First, power plants convert various primary energy sources (such as coal, hydropower, wind power, nuclear power, and solar energy) into electrical energy. Then, the large amount of electricity generated by the power plants is efficiently...
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