定价： 25元 加购物车

定价： 25元 加购物车

定价： 25元 加购物车

定价： 25元 加购物车

定价： 25元 加购物车

定价： 元 加购物车

定价： 33元 加购物车

定价： 25元 加购物车

定价： 25元 加购物车

定价： 25元 加购物车

定价： 元 加购物车

This guide describes the application philosophy, limitations, and test methods for the automatic voltage control (AVC) system of the regional power grid. This guide applies to the testing of the AVC systems in regional power grids.

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This guide for centralized protection and control (CPC) systems addresses the realization of various protection, automation, and control functions within a CPC system utilizing data collected from intelligent electronic devices (IEDs). This guide includes protection, automation, and control functions in a substation, including interconnecting circuits using devices and their interconnections with suitable communication protocols. This guide includes references to existing standards applicable… read more to protection, automation, and control applications for various types of circuit elements such as generators, transformers, bus bars, shunt and series capacitor banks, reactors, transmission lines, and distribution lines. The guide addresses the reliability of each CPC-based system architecture for typical substation applications. The guide also addresses CPC development, installation, testing, troubleshooting, and maintenance. read less

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This standard establishes design tests and specifications for high-voltage (above 1000 V) fuses and accessories for use on ac electrical distribution systems. Devices with rated maximum voltages to 170 kV are covered. The devices to which this standard applies are as follows: a) Expulsion fuses (including fuse cutouts) b) Current-limiting fuses c) Items a) and b) used in fuse-enclosure packages d) Fuse supports of the type intended for use with fuses and fuse disconnecting switches e)… read more Disconnecting devices (fuse disconnecting switches, disconnecting switches, and disconnecting cutouts) created by the use of a removable fuse unit or switch blade in a fuse support f) Expulsion, current-limiting, and combination types of external capacitor fuses used with a capacitor unit, a group of units, or capacitor banks g) Backup current-limiting fuses (“motor-starter fuses”) used in conjunction with high-voltage motor starters h) Fuse links when used exclusively with expulsion fuses and fuse disconnecting switches i) Items a) through f) having integral load-break means j) Accessories including mounting brackets and switch sticks (switch hooks) This standard may also be used as a basis for testing other devices that are similar to the devices listed in the scope. In addition, the parts relating to expulsion fuses may, where applicable, be used for non-expulsion fuses in which the interruption process waits for a natural current zero to clear the circuit. read less

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This standard contains requirements for all types of 50 Hz and 60 Hz synchronous generators and generator/motors rated 5 MVA and above to be used for hydraulic turbine or hydraulic pump/turbine applications. Generators and generator/motors below this rating are generally covered by NEMA MG 1-2021[B23].

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