Name: overhead power line materials and safety
Uploaded: 2024-11-21T14:54:23.000Z
Duration: 1 min 23 s
Channel: JoVE

알루미늄은 풍부하고 비용 효율적이기 때문에 가공 송전선에서 구리를 크게 대체했습니다. 널리 사용되는 강철 강화 알루미늄 도체는 강철 코어 주위의 알루미늄 가닥 층으로 구성됩니다.
다른 유형으로는 전체 알루미늄, 전체 알루미늄 합금, 알루미늄 도체 합금 강화 및 알루미늄 피복 강철 도체가 있습니다. 강철 지지대와 갭형 ZT 알루미늄 도체가 있는 알루미늄 도체는 150ºC 이상에서 작동할 수 있습니다. 송전선로의 전기 설계는 도체 유형, 크기, 위상별 번들 수, 열 용량, 전압 구배 제어, 절연체 디스크, 간극 및 라인 절연을 고려합니다. 쉴드 와이어는 낙뢰를 차단하고 타워 기초 저항을 줄입니다.
69kV 이상에서 작동하는 송전선로는 일반적으로 도자기, 강화 유리 또는 폴리머 디스크로 만들어진 서스펜션 유형 절연체를 사용합니다.
이 라인을 지지하는 구조는 고전압을 위한 격자 강철 타워에서 저전압을 위한 나무 프레임에 이르기까지 다양합니다.
기계적 설계는 안정성을 보장하며, 환경을 고려하여 토지 사용과 시각적 영향을 고려합니다.

송전선 설계 고려 사항

Transmission Line Design Considerations

알루미늄은 풍부함과 비용 효율성으로 인해 구리를 능가하여 가공 송전선에 적합한 소재가 되었습니다. 가장 널리 사용되는 유형은 강철 코어 주위에 알루미늄 가닥을 결합한 알루미늄 도체, 강철 강화(ACSR)입니다. 다른 변형으로는 모든 알루미늄 도체(AAC), 모든 알루미늄 합금 도체(AAAC), 알루미늄 도체 합금 강화(ACAR) 및 알루미늄 클래드 강철 도체가 있습니다. 강철 지지대가 있는 알루미늄 도체 및 갭 유형 ZT-알루미늄 도체와 같은 고급 설계는 섭씨 150도를 초과하는 온도에서 작동할 수 있습니다.

송전선의 전기 설계에는 몇 가지 중요한 요소가 포함됩니다. 여기에는 도체의 유형과 크기, 위상당 번들 수, 도체의 열 용량이 포함됩니다. 전압 기울기 제어는 에너지 손실을 최소화하는 데 필수적입니다. 도체와 지지 구조 사이에 배치된 절연 디스크는 적절한 절연을 보장하는 데 사용됩니다. 적절한 간격과 라인 절연은 안전과 효율성에 필수적입니다. 차폐선은 전략적으로 배치되어 낙뢰를 차단하여 타워 발판 저항을 줄이고 송전선을 보호합니다.

69킬로볼트(kV) 이상에서 작동하는 송전선은 일반적으로 도자기, 강화 유리 또는 폴리머 디스크로 구성된 현수형 절연체를 사용합니다. 지지 구조는 전압 레벨에 따라 달라지며, 고전압 선에는 자체 지지 격자 강철 타워가 사용되고 저전압 애플리케이션에는 목재 프레임이 사용됩니다. 일반적으로 고강도 강철 또는 알루모웰드로 만든 실드 와이어는 낙뢰로부터 보호하고 안전을 보장하기 위해 적절히 접지됩니다.

기계 설계는 도체, 절연체 스트링 및 지지 구조의 강도와 내구성을 보장합니다. 토지 사용 및 시각적 영향을 포함하는 환경적 고려 사항도 중요합니다. 목표는 설치 비용과 운영 손실을 고려하여 모든 기술적 기준을 충족하는 동시에 비용을 최소화하는 최적의 회선 설계를 달성하는 것입니다.

알루미늄은 풍부하고 비용 효율적이기 때문에 가공 송전선에서 구리를 크게 대체했습니다. 인기 있는 강철 강화 알루미늄 도체 ...

Education

교육

JoVE Core

Electrical Engineering

전기공학

Unit 1

제1단원

Transmission Line Parameters

송전선로 파라미터

KEY TERMS AND CONCEPTS

주요 용어 및 개념

overhead power line materials and safety

Overhead transmission lines rely on the right materials, insulation, and support hardware to move electricity safely and efficiently. Aluminum is now the preferred conductor material because it is abundant and cost-effective. Copper was used more often in the past, but aluminum has become the common choice for modern lines.

The most widely used conductor is aluminum conductor, steel-reinforced, or ACSR. It uses aluminum strands around a steel core for added strength. Other conductor types include all-aluminum conductors, all-aluminum alloy conductors, aluminum conductor alloy-reinforced, and aluminum-clad steel conductors. Some advanced designs, such as aluminum conductors with steel support and gap-type ZT-aluminum conductors, can operate above 150 degrees Celsius.

Transmission line design also depends on electrical limits and line safety. Engineers choose the conductor type and size, the number of bundles per phase, and the thermal capacity of the conductors. Voltage gradient control helps reduce energy loss. Insulator discs sit between the conductors and the support structures. Proper clearance and line insulation are also important for safe and efficient operation.

Shield wires add another layer of protection. They are placed to intercept lightning strikes and reduce tower footing resistance. This helps protect the transmission line from damage. Lines above 69 kilovolts usually use suspension-type insulators made from porcelain, toughened glass, or polymer discs.

The support structure changes with voltage level. High-voltage lines often use self-supporting lattice steel towers, while lower-voltage lines may use wooden frames. Shield wires are usually made from high-strength steel or Alumoweld, and they are grounded for safety. Mechanical design must keep the conductors, insulator strings, and support structures strong and durable. Environmental factors also matter, including land use and visual impact. The best line design meets technical needs while keeping installation costs and operating losses as low as possible.

Overhead Power Line Materials and Safety

transmission line design considerations

Overhead transmission lines rely on the right materials, insulation, and support hardware to move electricity safely and efficiently. Aluminum is now the preferred conductor material because it is abundant and cost-effective. Copper was used more often in the past, but aluminum has become the common choice for modern lines. The most widely used conductor is aluminum conductor, steel-reinforced, or ACSR. It uses aluminum strands around a steel core for added strength. Other conductor types...

resistance and conductance

How Transmission Lines Lose Energy

Transmission lines lose energy through resistance and conductance. DC resistance depends on a conductor’s resistivity, length, and cross-sectional area. Resistivity is a material property, and annealed copper is the international standard used for measurement. Material choice and conductor shape both matter. Hard-drawn aluminum at 20 degrees Celsius has a resistivity equal to 61% of the standard conductivity of annealed copper. Stranded conductors also gain a little extra resistance because...

inductance: solid cylindrical conductor

Magnetic Flux Linkage in Solid Conductors

Magnetic flux linkage in a solid cylindrical conductor is found by combining the field inside the wire with the field around it. The method uses a 1-meter section of a non-magnetic conductor with radius r. It also assumes the current is spread uniformly and ignores end effects. Inside the conductor, Ampere's law is used to find the magnetic field intensity H. The field is concentric and constant within the conductor. From H, the magnetic flux density B inside the wire is calculated. The...

inductance: single-phase and three-phase line

inductance-single-phase-and-three-phase-line

Transmission Line Inductance in Power Cables

Transmission line inductance helps explain how current-carrying conductors behave in power systems. It is especially important when studying single-phase two-wire lines and three-phase three-wire lines with equal phase spacing. These line types are common models for efficient transmission design and operation. A single-phase line uses two solid cylindrical conductors, labeled x and y. Each conductor carries a phasor current, ix and iy, and the sum of these currents is zero. The total flux...

series impedances: three-phase line

Three-Phase Line Impedance Matrix

Three-phase line impedance matrix calculations describe how resistance and inductive reactance behave in an overhead power line. The model includes three phase conductors and multiple neutral conductors that are grounded at regular intervals. It also accounts for unbalanced phase currents, which can send return current through the neutral wires and the earth along the lowest-impedance path. Kirchhoff’s laws are used to build an integro-differential equation for the conductor network. To make...

capacitance: single-phase and three-phase line

capacitance-single-phase-and-three-phase-line

Transmission Line Capacitance in Power Systems

Transmission line capacitance affects how power lines store charge and behave in electrical power systems. It is an important part of line modeling because it helps describe efficient operation. For a single-phase line, the key idea is the charge on the conductors and the voltage between them. A single-phase transmission line uses two wires with equal spacing. One conductor carries a uniform positive charge, and the other carries an equal negative charge. From the voltage between the...

shunt admittances

Image Method for Line Capacitance

Image conductors help model line capacitance in transmission lines above Earth. A uniformly charged conductor induces an equal and opposite charge on the ground. This creates electric field lines between the conductor and the Earth. The method of images replaces the Earth with a matching conductor placed symmetrically below the line. The image conductor has the same radius and the same charge magnitude as the original conductor. That setup keeps the electric field and voltage above the Earth...

key terms and concepts

Learn how aluminum conductors, insulators, shield wires, and tower designs keep overhead transmission lines efficient, durable, and safe.

Overhead Power Line Materials and Safety | JoVE K12

JoVE Core Electrical Engineering offers easy-to-understand animated videos that cover fundamental concepts of electric circuits along with circuit analysis techniques. It incorporates first-order and second-order circuits using operational amplifiers and circuit transformation concepts. The inclusion of practical design examples and real-world applications through scientist-in-action videos adds significant educational value, making complex concepts accessible.

electrical engineering

Overhead Power Line Materials and Safety

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