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This guide provides information on selection, sizing, installation design, installation, maintenance, and testing of stationary standby batteries used in uninterruptible power supply (UPS) systems having an ac output. Design requirements of the UPS components are beyond the scope of this document. While this document applies to all UPS systems, it may be impractical to implement some of its guidance and recommendations with small, self-contained systems, such as products intended to back up individual personal computers.

定价： 116元 / 折扣价： 99 元

This standard defines a baseline architectural framework and defines functional roles for blockchain-driven supply chain finance (SCF) implementations based on the account payable, e.g., core enterprise, supplier, bank, blockchain platform provider and so on. In addition, this standard outlines use cases and business flows for SCF based on blockchain, and specifies the functional implementation and security requirements.

定价： 59元 / 折扣价： 51 元

定价： 65元 / 折扣价： 56 元

This guide documents methods and designs to mitigate interruptions, equipment damage, and personnel safety issues resulting from animal intrusions into electric power supply substations, thereby improving reliability and safety, and minimizing the associated revenue loss.

定价： 72元 / 折扣价： 62 元

定价： 75元 / 折扣价： 64 元

This recommended practice addresses the inductive environment that exists in the vicinity of electric power and wire-line telecommunications systems and the interfering effect that may be produced thereeby; guidance is offered for the control or modification of the environment and the susceptibility of the affected systems in order to maintain an acceptable level of interference. An acceptable level is defined as an amount of steady-state or surge induced longitudinal voltage or current that… read more does not cause a personnel or public safety hazard, damage to cable or equipment, and/or circuit degradation or failure. To aid the user of this recommended practice in calculating induction between power and telecommunication lines, the concept of an interface is developed. This recommended practice permits either party, without need to involve the other, to verify the induction at the interface by use of a probe wire. This recommended practice does not apply to railway signal circuits. read less

定价： 106元 / 折扣价： 91 元

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This guide specifies the requirements and testing methods for a stationary energy feedback system to be used in trackside installations for a dc electrified railway power supply network. This system can harvest electric energy from the dc power supply network and feed the energy back to the ac power supply network. This guide covers terms and definitions, rating values, performance requirements, and test requirements. Performance requirements include efficiency, temperature, lifetime, control… read more and protection, electromagnetic compatibility (EMC), and mechanical characteristics. Test requirements will cover methods and criteria for type test, routine test, and commissioning test. However, the systems with the following functions are not included in this guide: - Resistive consumption of regenerated power - Energy storage system read less

定价： 75元 / 折扣价： 64 元

This recommended practice addresses activities related to PPS reliability, including design considerations, analytical studies, operational and maintenance considerations, and IAs between an NPGS and its associated Transmission Entities.

定价： 65元 / 折扣价： 56 元

This standard describes the design criteria of the PPS and its interfaces with the Class 1E power system, switchyard, transmission system, and AAC source. Figure 1 is a typical interface diagram of the PPS with related power systems.

定价： 59元 / 折扣价： 51 元