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Abstract: Recommended practices for specifying Thyristor-Controlled Series Capacitor (TCSC) installations used in series with transmission lines are provided. Ratings for TCSC thyristor valve assemblies, capacitors, and reactors as well as TCSC control characteristics, protective features, cooling systems, testing, commissioning, training, documentation, operation, and maintenance are addressed.

Standards, Engineering. --- Standards, Engineering

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A method of calculating the current-temperature relationship of bare overhead lines, given the weather conditions, is presented. Along with a mathematical method, sources of the values to be used in the calculation are indicated. This standard does not undertake to list actual temperature-ampacity relationships for a large number of conductors, but rather provides a standard method of doing such calculations.

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This standard covers the general parameters and characteristics associated with telephone loops from the subscriber signaling and analog voice frequency interface to the local Class 5 switch interface. It includes only those business and residential lines in the North American public switched network where no special performance requirements are involved. This standard provides common denominators for subscriber line performance, independent of facility types, construction processes or equipment, and circuit provisioning methods. This standard does not attempt to allocate impairments to the individual facilities and equipments that comprise the subscriber line. Such allocations are performed by the service providers to achieve the overall loop and telephone system performance.

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Replaced by 421.1-2004 (SH/SS95244) Abstract: IEEE Std 421.4-1990, IEEE Guide for the Preparation of Excitation System specifications, is intended to be a narrative description of items and functions that should be considered in the preparation of excitation system specifications. This guide applies to excitation systems for synchronous machines rated at 5000 kVA or larger.

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The purpose of this standard is to document the minimum information that users of bolometric power meters may need. It also provides potential purchasers and others with a common means for making comparisons between instruments and provides a uniformity of information among manufacturers. This standard applies to bolometric power meters as complete instruments and to their constituent parts: bolometric detectors, bolometer units, and bolometer elements. Bolometer power measurement instrumentation is generally used to measure, below 100 mW and above 10 MHz, the average power of electromagnetic waves propagating in a single mode in waveguide or coaxial transmission lines. The power range can be extended by the use of attenuators or directional couplers, or both.

Standards, Engineering.