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For more than 30 years, Cabling Installation & Maintenance has provided useful, practical information to professionals responsible for the specification, design, installation and management of structured cabling systems serving enterprise, data center and other environments. These professionals are challenged to stay informed of constantly evolving standards, system-design and installation approaches, product and system capabilities, technologies, as well as applications that rely on high-performance structured cabling systems. Our editors synthesize these complex issues into multiple information products. This portfolio of information products provides concrete detail that improves the efficiency of day-to-day operations, and equips cabling professionals with the perspective that enables strategic planning for networks’ optimum long-term performance.

Throughout our annual magazine, weekly email newsletters and 24/7/365 website, Cabling Installation & Maintenance digs into the essential topics our audience focuses on.

  • Design, Installation and Testing: We explain the bottom-up design of cabling systems, from case histories of actual projects to solutions for specific problems or aspects of the design process. We also look at specific installations using a case-history approach to highlight challenging problems, solutions and unique features. Additionally, we examine evolving test-and-measurement technologies and techniques designed to address the standards-governed and practical-use performance requirements of cabling systems.
  • Technology: We evaluate product innovations and technology trends as they impact a particular product class through interviews with manufacturers, installers and users, as well as contributed articles from subject-matter experts.
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  • Physical Security: Focusing on the areas in which security and IT—and the infrastructure for both—interlock and overlap, we pay specific attention to Internet Protocol’s influence over the development of security applications.
  • Standards: Tracking the activities of North American and international standards-making organizations, we provide updates on specifications that are in-progress, looking forward to how they will affect cabling-system design and installation. We also produce articles explaining the practical aspects of designing and installing cabling systems in accordance with the specifications of established standards.

Cabling Installation & Maintenance is published by Endeavor Business Media, a division of EndeavorB2B.

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Insulator Posts: Simple Guide to Electrical Isolation and Support​

By: AB Newswire

66

An insulator post—people also call it a Post Insulator—is a key part of electrical power transmission and distribution systems. It has two main jobs to do at the same time. First, it holds up electrical conductors or busbars (that’s the mechanical support). Second, it keeps those parts from touching the grounded structure (that’s the electrical isolation).​Design and Construction​ Insulator posts are different from string insulators, which hang from towers. Post insulators are stiff and stand upright. They need to handle big loads—like pushing, pulling at an angle, or twisting forces. Most of them have a strong central core. The core is usually made of porcelain or a composite polymer (things like silicone rubber or EPDM). Around the core, there are weather sheds or skirts.​ Porcelain is the traditional choice, and it’s tough. Porcelain posts have good strength for pushing forces, and they last a long time. Their glaze protects them from dirt in the air and damage from the sun’s UV rays. Composite posts are the newer type. They use a fiberglass resin rod for great pulling strength. This rod is covered with rubber housing and sheds. Composite posts are lighter. They’re also harder to break if someone tries to damage them. Their surfaces don’t hold water easily, so they work well in dirty areas or near the coast.​ The sheds are important. They make the insulator’s “creepage distance” longer. Creepage distance is the path along the insulator’s surface—from the live conductor to the ground. A longer path stops the electricity from jumping over (that’s called flashover), even when the surface is wet or dirty.

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Key Functions and Applications​ Insulator posts are everywhere in electrical infrastructure because they work in many ways. You’ll find them in substations. They’re the main part that holds up and isolates rigid busbars, disconnect switches, circuit breakers, and other equipment. They work in substations of all voltage levels.​ They’re also used on transformer platforms. They hold up and isolate the incoming and outgoing lines on power transformer platforms. You’ll see them in line applications too. On distribution lines, they’re used as strain or dead-end structures. On transmission towers, they support the jumper lines. Big industrial facilities and switchgear use them too—they isolate high-voltage equipment there. Critical Parameters for Selection​ Picking the right insulator post is important for system safety and reliability. There are key things to look at. Rated voltage is one—this is the highest system voltage the insulator is made for. Power-frequency withstand voltage is another. That’s the AC voltage the insulator can handle for one minute without flashover or getting a hole (puncture). Lightning impulse withstand voltage matters too. That’s how well the insulator can handle the high-voltage surges from lightning. Cantilever strength (or failing load) is critical. It’s the maximum mechanical load you can put on the top of the insulator before it breaks. This is important for handling wind and ice loads. Creepage distance is another one. You choose the length based on how dirty the installation site is.

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Media Contact
Company Name: Zhejiang ABIMAT Electric Co., Ltd.
Email: Send Email
Country: China
Website: https://www.abimatelectric.com/

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