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定价： 149元 / 折扣价： 127 元

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This standard covers the architecture of a dc microgrid for rural and remote applications with a nominal distribution voltage of 48 V. It defines voltage and power quality metrics for power supplied to loads attached to such a microgrid. This standard focuses on the power distribution portion of a microgrid and addresses sources only in the way that they are attached to the grid. It does not impose either minimum or maximum current limits. Users of this standard are responsible for observing… read more all applicable laws and regulations related to power grid and microgrid design, operation, and maintenance. Compliance with the provisions of this standard does not imply compliance to any such legal or regulatory requirements. read less

定价： 71元 / 折扣价： 61 元

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定价： 0元 / 折扣价： 0 元

This guide covers the application of SPDs used to protect the dc power feeds of remote radio heads (RRHs) and power supplies of optical fiber cable systems feeding the antenna systems.

定价： 64元 / 折扣价： 55 元

This recommended practice applies only to the use of serial digital transmission by supervisory control and data acquisition (SCADA) systems having geographically dispersed terminals. These types of systems typically utilize dedicated communication channels, such as private microwave channels or leased telephone lines, which are limited to data rates of less than 10 000 b/s. This recommended practice is not applicable to wideband local networks used for high-speed data acquisition and control… read more functions. This recommended practice generally defines a standard message protocol to the octet level, rather than to the bit level; most details at the bit level are left to the manufacturers of SCADA equipment to define and implement. With the increased use of microprocessors in SCADA equipment, it is expected that decoding at the bit level will employ table look-up techniques rather than use hard-wired logic; therefore, such details need not be specified in order to reach a reasonable degree of compatibility. This recommended practice supports Sections 5.4 and 7.4 of IEEE Std C37.1-1987 [7]. read less

定价： 172元 / 折扣价： 147 元

This standard covers the design, operations, and maintenance of a dc microgrid for rural or remote applications. The standard further provides requirements for providing low voltage dc and ac power to off-grid loads.

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