This recommended practice defines the classification and composition, technical requirements, test methods, inspection rules, marking, packing, transportation, storage, and installation of distributed traveling wave fault location devices for high-voltage direct-current (HVDC) transmission lines. This recommended practice can apply to a distributed traveling wave fault location device for HVDC transmission line and can be a reference for ac transmission lines.

定价： 70元 / 折扣价： 60 元

This standard applies to power-line carrier (PLC) line-tuning equipment connected between the coupling capacitors and PLC transmitter/receiver terminals operating in the frequency range of 30 kHz to 500 kHz over power transmission lines and cables or to similar line-tuning equipment in a carrier bypass. PLC line-tuning equipment includes assemblies and components: tuning inductor, impedance matching transformer, balancing transformer, tuning capacitor, inductance-capacitance (LC) tuning unit,… read more hybrid, filter, protective unit, interconnecting cables, and enclosure. This standard includes the protective devices that facilitate the safe operation and maintenance of the line-tuning components under normal and usual operating conditions. This standard will develop technical definitions, performance ratings, testing methods, and manufacturing requirements for the included line-tuning equipment. read less

定价： 110元 / 折扣价： 94 元

This standard covers the construction, mechanical, electrical, and optical performance, installation guidelines, acceptance criteria, test requirements, environmental considerations, and accessories for a nonmetallic, all-dielectric self-supporting (ADSS) fiber optic cable. The ADSS cable is designed to be located primarily on overhead utility facilities.

定价： 84元 / 折扣价： 72 元

This document provides a recommended practice for the arrangement principle of measurement points, the method of measurement, the analysis of measurement data, and the evaluation of measurement results for the corridor of overhead power transmission lines in parallel mixed with alternating current (ac) and direct current (dc), which can provide guidance for monitoring electromagnetic environmental of power transmission lines, as well as engineering design and equipment selection. This document… read more is applicable to measure the electromagnetic environment of the joint region under the ac and dc parallel transmission lines, whose maximum distance shall not exceed 100 m, the voltage shall not be less than 100 kV for ac transmission line and ±400 kV for dc transmission line. read less

定价： 76元 / 折扣价： 65 元

This standard is applicable to celebratory balloons that are comparable in size and shape to what are commonly referred to as foil balloons and are available in retail stores and filled with helium or a lighter-than-air gas. This test procedure evaluates the dielectric performance of celebratory balloons in contact with simulated energized overhead distribution power lines with the intent of minimizing balloon-caused power system outages (or electrical faults). The scope is limited to… read more distribution system voltages of 38 kV or less and only single balloons. The effects of having any moisture, contaminants, or string or ribbon attachments to the balloon(s) are not investigated under this procedure. read less

定价： 75元 / 折扣价： 64 元

定价： 104元 / 折扣价： 89 元