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A Comprehensive Guide to the "Core Equipment" of Power Systems

Release time:

2025-09-08

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Abstract

As the lifeblood of modern society's energy, the stable operation of the power system relies on the precise collaboration of multi-level equipment. From power generation to end-use, the core equipment at each stage undertakes irreplaceable functions. This article systematically reviews the key equipment in the four major stages of the power system: generation, transmission, transformation, and distribution, revealing their technical principles and industrial value.

1. Power Generation Stage: The "Heart" of Energy Conversion

1. The Three Core Machines of Thermal Power Generation

The boiler, turbine, and generator form the energy conversion chain in coal-fired power plants. The boiler converts chemical energy into thermal energy of high-temperature steam through combustion; the turbine converts steam thermal energy into mechanical energy; finally, the generator converts mechanical energy into electrical energy through electromagnetic induction. Taking ultra-supercritical units as an example, the main steam temperature exceeds 600°C, with power generation efficiency surpassing 45%, an increase of about 8% compared to subcritical units.

2. The Dual Core of Hydropower Generation

The turbine and generator form the core of hydropower stations. The mixed-flow turbine is suitable for water heads of 30-700 meters, with runner diameters up to 10 meters and single-unit capacity exceeding 800,000 kilowatts. The generator adopts a vertical structure, with speeds typically between 75-150 rpm, precisely controlling guide vane openings through a speed regulation system to maintain frequency stability. The Three Gorges Dam has 32 units of 700,000 kilowatts each, generating an annual output equivalent to 32 million tons of standard coal.

3. Breakthroughs in New Energy Generation Technologies

In wind power, direct-drive permanent magnet wind turbines omit gearboxes, reducing failure rates by 40%, though generator costs increase by 25%. In photovoltaic power, monocrystalline silicon cells achieve conversion efficiencies of 24.5%, while perovskite cells have laboratory efficiencies exceeding 33%. In energy storage, lithium batteries reach energy densities of 300 Wh/kg with cycle lives over 5,000 times, supporting large-scale integration of new energy.

2. Transmission Stage: The "Arteries" of Electric Energy Transmission

1. High-Voltage Transmission Equipment

Ultra-high voltage lines use eight-split conductors, increasing transmission capacity to 10 million kilowatts, reducing line losses from 6% to 2.5%. 750kV GIS switchgear has a breaking voltage withstand of 800kV and breaking capacity over 63kA, ensuring the safety of the West-to-East power transmission corridor. Flexible DC transmission technology achieves ±800kV voltage levels, reducing transmission losses by 30% compared to traditional DC.

2. Key Control Equipment

Series compensation devices increase line transmission capacity by 30%-40%. STATCOM dynamic reactive power compensation devices respond in less than 20ms, effectively suppressing voltage fluctuations. Intelligent circuit breakers integrate sensors and actuators, reducing fault interruption time to 30ms, a 60% improvement over traditional equipment.

3. Transformation Stage: The "Hub" of Voltage Conversion

1. Transformer Technology Evolution

1000kV ultra-high voltage transformers weigh over 400 tons, with partial discharge less than 100pC, and no-load losses reduced by 45% compared to 500kV equipment. Amorphous alloy transformers reduce iron losses by 75% compared to silicon steel sheet transformers, suitable for distributed power access scenarios. On-load tap changers have a tap range of ±20% with regulation accuracy of 0.25%, ensuring voltage quality.

2. Intelligent Protection Systems

Relay protection devices adopt dual-CPU architecture, with action times under 15ms and differential protection sensitivity reaching 0.2In. Digital bus protection devices can detect 0.1A current mutations, with fault isolation times under 80ms. Intelligent switchgear integrates live display, door protection, and program lock functions, reducing misoperation rates by 90%.

4. Distribution Stage: The "Capillaries" of Terminal Power Supply

1. Innovations in Switching Equipment

Environmentally friendly gas ring main units use dry air insulation with a global warming potential (GWP) of zero, reducing lifecycle costs by 35% compared to SF6 equipment. Solid-state circuit breakers based on SiC devices have breaking times under 5ms and volume reduced by 60%. Intelligent distribution cabinets integrate temperature and humidity control and fault recording functions, improving operation and maintenance efficiency by 40%.

2. New Distribution Technologies

Power electronic transformers achieve AC/DC hybrid power supply with 98.5% efficiency, capable of connecting photovoltaic, energy storage, and electric vehicle charging stations. Distributed power access devices feature island detection and low voltage ride-through functions, supporting autonomous microgrid operation. Demand response terminals enable second-level load control with peak-valley adjustment capabilities of 30%.

5. Common Technical Features of Core Equipment

1. Reliability Design

Key equipment adopts redundant configurations, such as dual circuit breaker protection and dual power supplies. Core components are designed for a 30-year lifespan with annual failure rates below 0.1%. Regarding environmental adaptability, equipment can operate stably under temperatures from -40°C to +70°C and 95% humidity.

2. Intelligent Upgrades

Digital twin technology enables full lifecycle management of equipment, with fault prediction accuracy reaching 92%. The 5G plus edge computing architecture supports millisecond-level control command transmission with latency under 10ms. AI algorithms optimize operating parameters, reducing coal consumption in power generation by 2g/kWh and line losses by 0.5 percentage points.

6. Industry Trends and Challenges

With the advancement of the "dual carbon" goals, core equipment shows three major trends: first, material innovation, with nanocrystalline alloy cores reducing losses by 50% and silicon carbide devices improving efficiency by 5%; second, structural optimization, with modular designs reducing equipment volume by 40% and operation and maintenance time by 60%; third, system integration, with energy routers achieving multi-energy complementarity and improving comprehensive energy efficiency by 15%.

However, technical bottlenecks remain: ultra-high voltage equipment insulation materials rely on imports; energy storage system cycle life needs to exceed 8,000 cycles; power electronic device voltage withstand levels need to be raised to 15kV. It is predicted that by 2030, the smart grid equipment market will reach 1.2 trillion yuan, with an annual compound growth rate exceeding 12%.

From steam turbines to silicon carbide chips, from mechanical switches to digital twins, the technological evolution of core power equipment reflects humanity's pursuit of

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Hunan Chengyuan Electrical CO.,LTD

A Comprehensive Guide to the "Core Equipment" of Power Systems