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This document is limited to providing recommended practices of maintenance. test schedules, and testing procedures that can be used to optimize life and performance from large lead storage batteries. It also provides guidance to determine when batteries should be replaced. There are other test procedures and replacement techniques used within the industry (especially for smaller substation batteries) that are equally as effective but are beyond the scope of this document. Sizing. installation,… read more otherre battery types, and application are also beyond the scope. This document does not include surveillance and testing of the dc system even though the battery is part of that system. read less

定价： 54元 / 折扣价： 46 元

定价： 96元

This procedure is intended for form-wound bars/coils for rotating machines rated 10 kV or more at 50 Hz or 60 Hz that are subjected to many transitions from no-load to full-load current during normal operations, and where rapid load variations are typical. Only the thermal cyclic degradation within the groundwall insulation and/or the conductor package and delamination of the groundwall insulation from the conductor are addressed by this test. Examples of machine types that typically exhibit… read more rapid load transitions include: -- Combustion turbine generators -- Pumped storage or peaking duty hydrogenerators -- Synchronous condensers -- Cyclic duty water pump motors Various pass/fail criteria are presented, and the ones that apply in a specific circumstance must be agreed between the user and the manufacturer prior to commencement of testing. Whether a particular bar or coil has passed or failed is best determined by comparing the test results from a number of stator bars or coils. read less

定价： 84元 / 折扣价： 72 元

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This recommended practice defines common terms in large-signal vector network analysis. Some fundamental terms used in small-signal vector network analysis that are also commonly used in large-signal vector network analysis are covered as well.

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This standard describes parameters and methods of measurement suitable for the characterization of varactors intended for large-signal application. This will be done by reference to the parameters and methods prescribed in IEEE Std 318-1971, Trial-Use Guide on Solid-State Devices: Varactor Measurements, Part I -- Small Signal Measurements, where they are applicable, and by modification and supplementation of them where necessary for use with large-signal devices.

定价： 54元 / 折扣价： 46 元

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