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This application guide presents generally accepted methods of protection for ac motors. It identifies and summarizes the functions necessary for adequate protection of motors based on type, size, and application. The recommendations in this guide are based on typical installations. Information relating to protection requirements, including microprocessor based protection systems, applications, and setting philosophy is provided to enable the reader to determine required protective functions for… read more motor installations. Relay protection of squirrel-cage, wound rotor induction motors, and synchronous motors is presented herein. This guide also summarizes the uses of relays and devices, individually and in combination, so the user may select the necessary equipment, to obtain adequate motor protection. This guide is concerned primarily with the protection of three-phase integral horsepower motors and adjustable-speed drives where specifically indicated. This guide does not purport to detail the protective requirements of all motors in every situation. What it does provide is enough information and guidance for the user to implement adequate protection for most applications. read less

定价： 191元 / 折扣价： 163 元

This application guide for the relay protection of squirrel-cage and wound-rotor induction motors and synchronous motors presents a review of the generally accepted forms of motor protection and summarizes the use of relays and devices, singly and in combination, so the reader may select the necessary equipment to obtain adequate motor protection. The guide is concerned primarily with the protection of three-phase integral horsepower motors and refers to twophase motors only in special… read more instances where specifically indicated. This guide is not a standard and does not purport to detail the protective requirements of all motors in every situation. Its recommendations are of a general nature, designed to cover the usual or typical motor installations. Sufficient background material on objectives,applications, and setting philosophy is presented, however, to enable the reader to evaluate the need for various forms of protection and to select and properly apply suitable equipment for most situations. read less

定价： 104元 / 折扣价： 89 元

This application guide for the relay protection of synchronous generators presents a review of the generally accepted forms of protection for the synchronous generator and its excitation system. It summarizes the use of relays and devices and serves as a guide for the selection of equipment to obtain adequate protection. The guide is primarily concerned with protection against faults and abnormal operating conditions for large hydraulic, steam, and combustion turbine generators. Basing… read more generator protection on machine size is difficult because the desired protection may be determined more by the importance of the generator to the power system than by the size of the generator. The recommendations made pertain to typical synchronous generator installations. However, sufficient background information relating to protection requirements, applications, and setting philosophy is given to enable the reader to evaluate the need, to select, and to apply suitable protection for most situations. The protective functions discussed in this guide may be implemented with a multifunction microprocessor based protection system (digital system). The protection philosophy, practices, and limits are essentially identical to those of the implementation using discrete component relays. The algorithms used to perform some of the protection functions may be different, but should produce equal or better protection. However, the performance and capability may be superior using the digital systems such as improved frequency response (bandwidth) and thresholds (pickup settings). Other additional features may be available from these digital systems that enhance the functionality. This guide does not purport to detail the protective requirements of all generators in every situation. For example, standby and emergency-use generators are specifically excluded. read less

定价： 87元 / 折扣价： 74 元

This guide is primarily concerned with outdoor ac substations, either conventional or gas-insulated. Distribution, transmission, and generating plant substations are included. With proper caution, the methods described herein are also applicable to indoor portions of such substations, or to substations that are wholly indoors. No attempt is made to cover the grounding problems peculiar to dc substations. A quantitative analysis of the effects of lightning surges is also beyond the scope of this guide.

定价： 206元 / 折扣价： 176 元

This standard covers metal-enclosed interrupter (MEI) switchgear assemblies where air at ambient pressure is the primary insulating medium. Individual components within the switchgear may use other insulating means. The switchgear includes components such as interrupter switches; selector switches; power fuses; circuit breakers; control, instrumentation and metering devices; and protective equipment. MEI switchgear includes, but is not specifically limited to, equipment for the control and… read more protection of apparatus used for distribution of electrical power. This standard is concerned with enclosed (rather than open), indoor and outdoor switchgear assemblies rated above 1 kV ac up to and including 48.3 kV ac. It includes equipment that is part of primary and secondary unit substations. It does not include gas-insulated substation equipment or switching devices mounted integrally within a transformer enclosure. read less

定价： 104元 / 折扣价： 89 元

This guide applies to three-phase overhead ac transmission line (110 kV to 1000 kV) design and construction, and it can be used as reference for lower voltage levels. This guide specifies design methodologies of the overhead transmission line conductors and ground wires, insulators and fittings, insulation coordination, lightning protection and grounding, conductor arrangement, as well as tower types, loads, materials, structure, and foundations.

定价： 160元 / 折扣价： 136 元

This guide will provide testing methods for impedance measurement of alternating current (AC) transmission line and calculating methods for the RLC (Resistance, Inductance, and Capacitance) distribution parameters of the tested line. It will also provide testing and calculating methods to obtain mutual inductance and coupling capacitance between double circuit lines on same tower. This guide will outline the measuring instruments and the safety of the measurement. In addition, it will include… read more test procedures to obtain the open circuit impedances of the tested line as well as the formulas to get the distributed parameters from impedance measurements. read less

定价： 106元 / 折扣价： 91 元