IEE-Business: Learn Electrical & Electronics Engineering (For Free)

English
RFQ

Download the app

Topics

Transformer Power Systems Machines Power system circuit diagram Basic Measurement Basic Electrical Transmission Industrial circuit Basic knowledge Electric Power Knowledge Failure and Maintenance Electric Motors Protection Control Motor Physics Articles Applications and Trends Design and Simulation

Hot Knowledges

Experts

Dyson

Focused on the design of electrical equipment, proficient in electrical principles and relevant specifications, and skilled in using design software. From intelligent substations to various types of electrical equipment, I am adept at optimizing design solutions, integrating new technologies. With practical experience and collaborative management capabilities, I deliver outstanding electrical design achievements.
Oliver Watts

Hey! I'm Oliver Watts, an electrical engineer in Inspection and Testing. With years of hands - on experience, I ensure electrical systems meet top safety and performance standards. Using advanced gear, I conduct diverse tests, easily spotting issues in both large - scale industrial and small - scale commercial setups. I love teaming up, sharing knowledge, and keeping up with industry regs. Also, I'm skilled at data analysis with software. If you're into electrical inspection or just want to chat engineering, reach out. Let's connect and explore!
Felix Spark

Hey there! I'm an electrical engineer specializing in Failure and Maintenance. I've dedicated my career to ensuring the seamless operation of electrical systems. I excel at diagnosing complex electrical failures, from malfunctioning industrial motors to glitchy power distribution networks. Using state - of - the - art diagnostic tools and my in - depth knowledge, I pinpoint issues quickly. On this platform, I'm eager to share my insights, exchange ideas, and collaborate with fellow experts. Let's work together to enhance the reliability of electrical setups.
Master Electrician

We aim to gather electrical knowledge and share it with others.

Dyson

Focused on the design of electrical equipment, proficient in electrical principles and relevant specifications, and skilled in using design software. From intelligent substations to various types of electrical equipment, I am adept at optimizing design solutions, integrating new technologies. With practical experience and collaborative management capabilities, I deliver outstanding electrical design achievements.
Oliver Watts

Hey! I'm Oliver Watts, an electrical engineer in Inspection and Testing. With years of hands - on experience, I ensure electrical systems meet top safety and performance standards. Using advanced gear, I conduct diverse tests, easily spotting issues in both large - scale industrial and small - scale commercial setups. I love teaming up, sharing knowledge, and keeping up with industry regs. Also, I'm skilled at data analysis with software. If you're into electrical inspection or just want to chat engineering, reach out. Let's connect and explore!
Felix Spark

Hey there! I'm an electrical engineer specializing in Failure and Maintenance. I've dedicated my career to ensuring the seamless operation of electrical systems. I excel at diagnosing complex electrical failures, from malfunctioning industrial motors to glitchy power distribution networks. Using state - of - the - art diagnostic tools and my in - depth knowledge, I pinpoint issues quickly. On this platform, I'm eager to share my insights, exchange ideas, and collaborate with fellow experts. Let's work together to enhance the reliability of electrical setups.
Master Electrician

We aim to gather electrical knowledge and share it with others.
Encyclopedia

The Electricity Encyclopedia is dedicated to accelerating the dissemination and application of electricity knowledge and adding impetus to the development and innovation of the electricity industry.

Recommend for you

What's the maximum efficiency of a power transformer?

Using automation The efficiency of a power transformer is influenced by a variety of factors, including its design, size, and operating conditions. In general, power transformers are highly efficient, with typical efficiencies exceeding 95%, and often reaching 98% or higher. However, actual efficiency can vary depending on load levels, voltage ratings, and specific design characteristics.Transformer efficiency (η) is defined as the ratio of output power to input power, expressed as a percentage:η = (Outp

What tests are involved for environmentally friendly insulated ring main units?

Using automation 1. Type Test System and StandardsType testing verifies the design rationality and safety of eco-friendly insulated ring main units (RMUs), based on IEC 62271-200 and GB/T 3906, and includes:Insulation Performance: For 12kV RMUs, power frequency withstand voltage is 42kV (1 min) for main circuits and 48kV for breakers. Lightning impulse withstand is 75kV (12kV system) or 125kV (24kV system), with 15 standard impulses (1.2/50μs) per polarity. Partial discharge must be ≤10pC at 1.2× rat

What are the common faults of environmentally friendly gas - insulated ring main units?

Using automation 1. Gas System FaultsThe most critical type of fault in environmentally friendly gas-insulated ring main units is related to the gas system, primarily involving gas leakage and pressure anomalies. Gas leakage in nitrogen-insulated ring main units mainly stems from seal material aging and welding process defects. Statistics indicate that approximately 65% of gas leakage faults are related to O-ring aging, while 30% are caused by inadequate welding. Gas leakage not only affects insulation performan

Innovation and Application of 12–24 kV Nitrogen-Insulated Ring Main Units

Using automation 1 Characteristics of Nitrogen-Insulated Ring Main UnitsThe new generation of nitrogen-insulated ring main units has the following main characteristics:Excellent insulation performance. All live components are sealed inside, with external surfaces made of insulating material, effectively blocking current flow and preventing interference from external charged objects.Strong resistance to external environmental conditions. Both the enclosure and internal insulation materials possess high resilience

Indoor Metal-Clad Switchgear Equipment

Using automation The switchgear comprises a fixed cabinet and removable components (i.e., the draw-out unit or "handcart"). The cabinet enclosure and partition plates of each functional unit are constructed from aluminum-zinc-coated steel sheets, precision-formed using CNC machinery and assembled with bolts. This ensures dimensional consistency, high mechanical strength, and excellent resistance to corrosion and oxidation. The overall protection level of the switchgear enclosure is IP4X; when the circuit breaker

Technical Features and Development Trends of Dry Air - Insulated Ring Main Units

Using automation 1. Air-insulated and SF₆ Gas-insulated Ring Main UnitsAir-insulated ring main units primarily integrate load break switches, disconnectors, or a combination of both with grounding capabilities, operated either manually or electrically. These units may also incorporate fuses to control cable input and output lines. Conversely, SF₆ gas-insulated ring main units, commonly referred to as gas-insulated switchgear, utilize SF₆ gas for insulation and arc quenching due to its high dielectric strength, p

Electric Field Analysis of Isolation Fracture in 12 kV Air - Insulated Ring Main Unit

Using automation This paper takes the primary isolation break of a certain type of 12kV air-insulated ring main unit (RMU) as the research object, analyzing the electric field distribution and uniformity around it, evaluating the insulation performance at this location, and reducing discharge risk while enhancing insulation performance through structural optimization, thereby providing a reference for the insulation design of similar products.1 Structure of the Air-Insulated Ring Main UnitThe three-dimensional s

Comprehensive Operation and Maintenance Strategy for Medium-Voltage Distribution Equipment Taking 12 kV Air-Insulated Ring Main Units as an Example

Using automation 1. Integrated Operation and Maintenance Strategy for Medium-Voltage Distribution EquipmentTo effectively prevent discharge faults in distribution equipment, it is essential to establish a corresponding operation and maintenance (O&M) strategy. This strategy should focus on air-insulated ring main units (RMUs) as the primary subject, utilizing live-line detection as a key method and aiming for closed-loop defect elimination. This approach establishes a scientific and effective closed-loop man

Comparison of Main Protections for Transformer (Differential Protection, Gas Protection)

Using automation Transformer Main ProtectionThe main protection for transformers consists of gas protection and differential protection.Gas ProtectionGas protection is a protective mechanism that responds to internal faults within the transformer tank and to a drop in oil level. When an internal fault occurs in the transformer tank, gases generated from the decomposition of transformer oil and insulation materials due to fault currents and arcing flow from the tank toward the upper part of the oil conservator. T

Configuration and Cases of Backup Protection for Main Transformer

Using automation Main Transformer Backup ProtectionThe purpose of main transformer backup protection is to prevent overcurrent in transformer windings caused by external faults, serve as backup protection for adjacent components (busbars or lines), and, where possible, act as backup for the transformer's primary protection in the event of internal faults. Backup protection is used to isolate faults when primary protection or circuit breakers fail.Main transformer zero-sequence protection is a backup protection f

Introduction to Transformer Oil Conservator

Using automation Introduction to Transformer Oil ConservatorThe oil conservator is a crucial oil storage device for transformers. When the transformer load increases and the oil temperature rises, the insulating oil inside the tank expands due to heat, causing excess oil to flow into the conservator. Conversely, when the temperature decreases, the oil in the conservator flows back into the tank. This process enables automatic oil level regulation, allowing the conservator to serve both oil storage and replenishm

How does an electrical substation work?

Using automation An electrical substation is a critical component of the power transmission and distribution system. Its primary function is to receive electricity from high-voltage transmission lines and deliver it at lower voltages suitable for end users, such as homes, businesses, and other consumers. The operation of a substation can be summarized as follows:Step-down Transformer: Electricity generated at power plants is transmitted over long distances at high voltages to reduce energy losses. Upon reaching

Basic Concepts of Primary and Secondary Coils in Transformers

Using automation The primary and secondary coils are two fundamental components of a transformer, enabling the transmission and transformation of electrical energy through the principle of electromagnetic induction. The primary coil receives high-voltage current from the input source and generates a varying magnetic field, while the secondary coil, influenced by this magnetic field, produces a corresponding output voltage. Their interaction allows the transformer to perform voltage conversion, facilitating effic

Technology and Tests of Medium - Voltage Solid - Insulated Ring Main Units

Using automation 1 Insulation Materials and DesignBased on cost statistics for medium-voltage solid-insulated ring main units (RMUs), the insulation structure accounts for over 40% of the total cost. Therefore, selecting appropriate insulation materials, designing rational insulation structures, and determining the correct insulation method are crucial to the value of medium-voltage RMUs. Since the first synthesis of epoxy resin in 1930, various additives have been continuously explored to improve its properties

Development of Direct-Acting Permanent Magnet Mechanism for Solid-Insulated Ring Main Units

Using automation 1.Permanent Magnet Mechanism DesignDue to the high demand for miniaturization in solid-insulated ring main units (RMUs), traditional single permanent magnet mechanisms with three-phase interlocking cannot meet the overall miniaturization requirements of the equipment. Therefore, the permanent magnet mechanism designed in this context adopts a three-phase independent direct-acting structure. Each phase's arc extinguishing chamber unit is integrally cast with the casting body of the RMU and connec

The Development of Solid-Insulated Ring Main Units

Using automation Development Status at Home and AbroadToshiba Corporation of Japan developed high-performance epoxy resin materials and casting technology in 1999, and subsequently launched a 24 kV solid-insulated ring main unit (RMU) in 2002. The product line has since been expanded, and the company is now advancing toward higher voltage levels of 72 kV and 84 kV. Holec, originally a European pioneer with advanced design concepts and environmentally friendly manufacturing processes that produce no pollution, wa

A Review of Several Technical Issues in the R&D of Solid-Insulated Ring Main Units

Using automation 1.Current Application Status of Solid-Insulated Ring Main Units in Medium-Voltage Distribution Networks1.1 Widespread Application in Urban Residential AreasThe core components of medium-voltage ring main units (RMUs) primarily consist of load switches and fuses. These units offer several advantages, including a simple structure, compact size, and relatively low cost. Additionally, they effectively improve power quality and enhance the reliability and safety of power supply. Observations indicate

Analysis on the Technical Status of Solid-Insulated Ring Main Units in the Medium-Voltage Distribution Network Field

Using automation Current Application Status of Solid-Insulated Ring Main Units in Medium-Voltage Distribution Networks(1) Solid-insulated ring main units (RMUs) have been widely applied in urban residential areas and other medium-voltage distribution applications. The core components of medium-voltage RMUs mainly include the load switch and the fuse. These units offer advantages such as a simple structure, compact size, and low cost, while effectively improving power supply parameters and enhancing operational s

Source professional electrical partners, experts, and explore smart grid & energy solutions.