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This loading guide applies to ac high-voltage air switches in excess of 1000 V rated in accordance with IEEE Std C37.30-1992.1 This standard does not apply to switches used in enclosures covered by IEEE Std C37.20.2-1993, IEEE Std C37.20.3-1996, IEEE Std C37.23-1987, IEEE Std C37.71-1984, and ANSI C37.72-1987. Moreover, interrupter switches covered by IEEE. PC37.39 are excluded from the scope of this standard. If an air switch is equipped with a load-break device or interrupter, it may not… read more successfully interrupt currents above the nameplate rating. read less

定价： 141元 / 折扣价： 120 元

定价： 无文本

This standard applies to two or three terminal, four or five layer, thyristor surge protection devices (SPDs) for application on systems with voltages equal to or less than 1000 V rms or 1200 V dc. These protective devices are designed to limit voltage surges on communication circuits and on power circuits operating from direct current (dc) to 420 Hz. The thyristor SPD can be manufactured with unidirectional or bidirectional, symmetrical, or asymmetrical V-I characteristics. This standard… read more contains definitions, service conditions, and a series of test criteria for determining the characteristics of a thyristor SPD. If the characteristics differ with the direction of conduction, each polarity shall be separately specified. read less

定价： 151元 / 折扣价： 129 元

This application guide applies to Thyristor Surge Protective Components (SPCs)used in systems with voltages up to 1000 Vrms or 1200 Vdc. These components are designed to limit overvoltages and divert surge currents by limiting the voltage and switching to a low impedance state. Although telecommunication circuits are the main application of Thyristor SPCs, this guide will also provide useful information for other protection applications. This guide is intended to complement and be used in… read more conjunction with the IEEE Standard Test Specification for Thyristor Diode Surge Protective Devices (IEEE C62.37). read less

定价： 138元 / 折扣价： 118 元

This standard provides training requirements for four levels of training as part of the domestic capabilities of public safety agencies to detect, analyze, and report on nuclear and other radioactive materials that are out of regulatory control. This standard describes training requirements applying to these training levels across the range of federal, state, tribal, territorial, and local governments, and the private sector conducting the preventive radiological/nuclear detection (RND) mission… read more to reduce the risk of terrorists or covert state-sponsored attacks on the United States using radiological or nuclear weapons of mass destruction (WMDs). Of the preparedness capabilities described in Presidential Policy Directive 8: National Preparedness (PPD-8), the scope of this standard includes the capabilities for Prevention and Protection mission areas, but not those for Mitigation, Response, and Recovery mission areas. Within the Prevention and Protection mission area capabilities explained in the U.S. Department of Homeland Security (USDHS) National Preparedness Goal, the scope includes core capability for Screening, Search, and Detection. In particular, the scope of this standard describes requirements for training on the operation and deployment of the following radiation detection instrumentation as used in the RND mission: Alarming personal radiation detectors (PRDs), reference ANSI N42.321; Portable radiation detection instrumentation, reference ANSI N42.33; Handheld instruments for the detection and identification of radionuclides, i.e., radionuclide identifiers, radioisotope identification devices (RIIDs), references ANSI N42.34 and USDHS 500-DNDO-117250; Radiation portal monitors (RPMs) and spectroscopy-based portal monitors (SRPMs), references ANSI N42.35 and ANSI N42.38; Vehicle-mounted mobile systems and transportable radiation monitors, references ANSI N42.43 and USDHS 500-DNDO-119430; Spectroscopic personal radiation detectors (SPRDs), reference ANSI N42.48; Backpack-based radiation detection systems (BRDs) and human-portable detectors (HPDs), references ANSI N42.53 and USDHS 500-DNDO-119420 Training scope includes safety-related instruments used by RND personnel, such as: Alarming electronic personal emergency radiation detectors (PERDs), reference ANSI N42.49A; Non-alarming PERDs, reference ANSI N42.49B. The scope does not include the capabilities specific to nuclear safeguards, security of nuclear facilities, nuclear forensics, or technical reachback analysis. Although they are not the focus of this standard, radiation detection instruments used primarily for other missions and capabilities (e.g., Response and Recovery mission areas) may have some applications for RND mission areas and capabilities. Training requirements from this standard should be considered for all radiation detection instrumentation used for any RND mission areas. read less

定价： 129元 / 折扣价： 110 元

This standard provides a basis for electronic reporting of transformer test data on liquid-immersed distribution transformers. This standard defines how to format and report the standard test data when electronic reporting is specified. In addition, it defines an extended set of data for those users who have a need for data.

定价： 55元 / 折扣价： 47 元