National Grid has filed a patent for a compact transmission lines structure. The structure includes a pole and crossarm, with a cantilever end and two diamond-shaped insulator assemblies supporting three-phase transmission lines. The structure also features shield wires for lightning protection. GlobalData’s report on National Grid gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on National Grid, fiber-reinforced material joining techniques was a key innovation area identified from patents. National Grid's grant share as of June 2023 was 1%. Grant share is based on the ratio of number of grants to total number of patents.

Compact transmission lines structure with diamond-shaped insulator assembly

Source: United States Patent and Trademark Office(USPTO). Credit: National Grid Plc

A recently filed patent (Publication Number: US20230178973A1) describes a compact transmission line structure for carrying transmission lines. The structure consists of three subsystems: a pole and crossarm subsystem, a first diamond-shaped insulator assembly supporting a first three-phase transmission line, and a second diamond-shaped insulator assembly supporting a second three-phase transmission line. The first and second diamond-shaped insulator assemblies are connected to the cantilever end of the crossarm. The transmission lines are arranged in an equilateral delta or isosceles delta configuration, allowing the phase conductors to run parallel to each other at a proper phase spacing. The structure also includes shield wires for lightning protection.

The compact transmission line structure further includes upper yoke plates associated with the second and third subsystems to withstand the weight of the subsystems. Shield wires are situated on top of connection plates between the arms and beaks of the crossarm to provide additional lightning protection. The structure has a width less than or equal to 30 feet and a height less than or equal to 45 feet. Each phase of the transmission lines operates at or over 115 kV volts phase to ground. The first diamond-shaped insulator assembly includes phase conductor clamps connected by a yoke plate assembly. An auxiliary subsystem connects the inner point of the first diamond-shaped insulator assembly to the pole.

In addition to the compact transmission line structure, the patent also describes a compact T-structure and a compact inverted L-structure. The compact T-structure is capable of carrying up to two transmission lines and consists of a center pole, a monolithic crossarm, and two diamond-shaped insulator assemblies. The compact inverted L-structure is designed for carrying a single circuit and includes a pole, a unique monolithic crossarm, and a diamond-shaped insulator assembly. Both structures have specific dimensions and configurations to ensure efficient transmission of electricity.

Overall, the patent presents innovative designs for compact transmission line structures that can carry multiple transmission lines while maintaining proper phase spacing and providing lightning protection. These structures have the potential to improve the efficiency and reliability of power transmission systems.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.