This recommended practice describes how to conduct load-flow studies and analysis for industrial and commercial power systems. It will be of greatest value to the power-oriented engineer with limited experience in this area. It can also be an aid to all engineers responsible for the electrical design of industrial and commercial power systems.

定价： 104元 / 折扣价： 89 元

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This standard covers basic design parameters and features for Non-Load Make or Break Direct Current Disconnect switches used on Transit systems for isolation applications.

定价： 0元 / 折扣价： 0 元

This project will be to review and revise the current ANSI/IEEE C37.71 to be consistent with other standards int his group and to include vault style switches.

定价： 141元 / 折扣价： 120 元

This recommended practice applies only to two winding transformers covered by IEEE Std C57.12.00, IEEE Std C57.12.01, and NEMA ST20.1 It does not apply to rectifier transformers

定价： 83元 / 折扣价： 71 元

This standard applies to surge-protective devices (SPDs) intended to be installed on the load side of the service equipment connected to 50 Hz or 60 Hz alternating current (ac) power circuits rated at 1000 V (root mean squared [rms]) or less. Performance characteristics and standard methods for testing and rating are established for these devices, which may be composed of any combination of components. The tests in this standard are aimed at providing comparisons among the variety of surge-protective devices available.

定价： 83元 / 折扣价： 71 元

This standard covers certain electrical, dimensional, and mechanical characteristics and takes into consideration certain safety features of 60-Hz, two-winding, liquid-immersed transformers rated as follows, and used for step-down purposes: 1) 833/958 through 8333/10 417 kVA, single-phase; 750/862 through 10 000/12 500 kVA, three-phase; high voltage, 2400 through 138 000 volts; low-voltage, 480 through 36 230 volts; without load tap changing. 2) 12 000/16 000/20 000 through 60 000/80 000/ 100 00… read more 0 kVA, three-phase; high voltage, 23 000 through 230 000 volts; low voltage, 4800 through 36 230 volts; without load tap changing. 3) 3750/4687 through 10 000/12 500 kVA, three-phase; high voltage, 6900 through 138 000 volts", low voltage, 2400 through 36 230 volts; with load tap changing. 4) 12 000/16 000/20 000 through 60 000/80 000/100 000 kVA, three-phase; high voltage, 23 000 through 230 000 volts; low voltage, 4800 through 36 230 volts; with load tap changing It is not intended that this standard shall apply to dry-type, regulating, pad-mounted, secondary-network, furnace, rectifier, or mine transformers. read less

定价： 66元 / 折扣价： 57 元

This guide covers the application of surge-protective devices (SPDs) for installation on the load side of the service equipment for 50 Hz or 60 Hz, ac power circuits rated 1000 V rms or less.

定价： 158元 / 折扣价： 135 元