Std 1143-1994 IEEE Guide on Shielding Practice for Low Voltage Cables (Ieee Std 1143

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Transformers and inductors of both the saturating and emissions of mobile communication transmitters designed to nonsaturating type are covered.

The power-transfer capability generate FM signals in the frequency range of 25 to of the transformers and inductors covered ranges from less MHz, are covered. The purpose is to enable design and than 1 W to the multikilowatt level. The purpose is to provide system engineers engaged in a variety of development proj- a common basis between the engineers designing power-con- ects to achieve uniform results in recognizing the sources and version circuits and the engineers designing the transformers nature of RF spurious emissions emanating from vehicular and inductors used in those circuits.

Apparatus used in equip- communications transmitters. Procedures for measuring both ment for high-voltage power conversion for distribution by broadband and narrowband spectra are provided for both con- electric utilities is not covered. However, reference values that are not limited by the Electronics Transformers and Inductors. Design and performance characteristics of electronics transformers requirements that are unique to Class 1E control boards, pan- and inductors.

These tests are designed primarily for trans- els, and racks are specified. Standards for qualification tests formers and inductors used in all types of electronics appli- to verify that these design requirements have been satisfied cations, but they may apply to the other types of transformers are provided. This standard is not intended to define the se- of large apparent-power rating used in the electric power util- lection, design, or qualification of piping, modules, or other ity industry.

It is concerned, however, with the effect such formers. Pulse transformers for use in electronic equipment mounted equipment has on the design and qualifications. This standard applies to the following trans- Qualification and testing of individual Class 1E control board former types: power output drivers , impedance matching, components and modules and external field-run cables are not interstage coupling, current sensing, and blocking-oscillator covered. Elements voltage transmitted ranges from a few volts to many kilovolts. Test methods useful in the design, anal- cations, evaluating excitation system performance, specifying ysis, and operation of magnetic cores in many types of ap- methods for excitation system tests, and preparing excitation plications are presented.

IEEE Guide on Shielding Practice for Low Voltage Cables (Ieee Std 1143 ...

It is also intended to serve as an educational ing permeability, core loss, apparent core loss, induction, aid for those becoming acquainted with excitation systems. Most of the test methods described include specific Testing, and Evaluation of the Dynamic Performance of Ex- parameter ranges, instrument accuracies, core sizes, etc.

Criteria, definitions, and test pro- may be used in the specification of magnetic cores for indus- cedures for evaluating the dynamic performance of excitation trial and military applications. More generalized test proce- control systems as applied by electric utilities are provided.

Although the primary concern is with machine and its excitation system, is a feedback control sys- cores of the type used in electronic transformers, magnetic tem, many definitions and performance criteria that are com- amplifiers, inductors, and related devices, many of the tests mon to all feedback control systems have been adopted.

Oth- are adaptable to cores used in many other applications. This Recommended Practice is a reference source for control systems including both the synchronous machine and engineers involved in industrial and commercial power sys- its excitation system for both large and small signal distur- tems analysis. It contains a thorough analysis of the power bances; to confirm the adequacy of mathematical models of system data required, and the techniques most commonly excitation systems for use in analytical studies of power sys- used in computer-aided analysis, in order to perform specific tems; to specify methods for performing tests of excitation power system studies of the following: short-circuit, load control systems and their components; and to prepare exci- flow, motor-starting, cable ampacity, stability, harmonic anal- tation system specifications and additional standards.

Portions ysis, switching transient, reliability, ground mat, protective of this standard can also serve as a tutorial for people becom- coordination, dc auxiliary power system, and power system ing acquainted with excitation control systems.

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IEEE Std Collection II (Power Systems)

Proce- chines. High-potential test voltages for excitation systems dures and test-voltage values for acceptance and maintenance used with synchronous machines are established. Test volt- high-direct-voltage testing of power cable systems are pre- ages are established based on whether equipment is connected sented. The procedures apply to all types of insulated cable to the exciter power circuit or is electrically isolated from the systems rated between V and 69 kV and intended pri- exciter power circuit.

This guide is in- bles, high-frequency or other special-purpose cables, al- tended to provide to the specification writer the necessary though information of some value may be obtained thereby. The informa- to provide guidelines for evaluation of the test results. Excitation system models suitable for use in large- — V and cable joints for use with laminated di- scale system stability studies are presented.

With these mod- electric cable rated in preferred voltage steps from — els, most of the excitation systems currently in widespread V. It also defines a variety of common joint construc- use on large, system-connected synchronous machines in tions. This standard is designed to provide uniform testing North America can be represented. They include updates of procedures that can be used by manufacturers and users to models published in the Transactions on Power Apparatus evaluate the ability of underground power cable splices to and Systems in , as well as models for additional control perform reliably in service.

A test procedure plications. However, specific applications, such as emergency for comparing two or more sealed insulation systems in ac- lighting units and semiportable equipment, may have other cordance with their expected life at rated temperature is out- appropriate practices and are beyond the scope of this rec- lined.

The procedure is limited to insulation systems for al- ommended practice.

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Information necessary to permit an effective more locations with respect to frequency, time, and position evaluation of the insulation systems of medium and small are provided. Periodic and random radiated electric and mag- rotating electrical machines is presented.

The guide is in- netic fields and conducted interference within the frequency tended to apply in general to industrial air-cooled machines range of 10 kHz to 10 GHz are considered. Although several rated from 5 hp to less than 10 hp. However, the proce- aspects of radio-emission investigation are not addressed di- dures may be found useful for other types of machines.

Terms that have a spe- to these areas is provided. Test pro- testing the armature insulation of large ac machines with VLF cedures for microwave field disturbance sensors to measure voltage is provided. Constants for relating VLF tests to radio frequency RF radiated field strength of the fundamen- power-frequency and direct-voltage tests to obtain equally ef- tal frequency, harmonic frequencies, near field power flux fective test levels are recommended.

Thermal aging, teries for Stationary Applications. Recommended design voltage endurance, thermomechanical forces, and electro- practices and procedures for storage, location, mounting, ven- mechanical forces are addressed. Required safety Resistivity Measurement. A method for measurement of soil practices are also included. These recommended practices are thermal resistivity that is based on the theory that the rate of applicable to all stationary applications.

However, specific temperature rise of a line heat source is dependent upon the applications, such as emergency lighting units and semiport- thermal constants of the medium in which it is placed is given. The aim is to provide sufficient in- recommended practice.

Std 1143-1994 IEEE Guide on Shielding Practice for Low Voltage Cables (Ieee Std 1143

Methods for available on the market, and to make meaningful resistivity defining the dc load and for sizing a lead-acid battery to sup- measurements with this equipment in the field or on soil sam- ply that load for stationary battery applications in full float ples in the laboratory. Designs for both laboratory and field operations are described. Some factors relating to cell selec- thermal needles are described. This Rec- ommended practice.

IEEE Guide on Shielding Practice for Low Voltage Cables

Design of the dc system and sizing of ommended Practice addresses the uses, power sources, de- the battery charger s are also beyond the scope of this rec- sign, and maintenance of emergency and standby power sys- ommended practice. Chapter 9 for the Protection of Wire-Line Communication Facilities lists the power needs for specific industries. Chapters 4 and Serving Electric Power Stations. Workable methods for pro- 5 deal with the selection of power sources.

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Chapter 6 provides tecting wire-line communication circuits entering power sta- recommendations for protecting both power sources and tions are presented. This standard covers: the electric power switching equipment during fault conditions. Chapter 7 pro- station environment; protection apparatus; service types, re- vides recommendations for design of system grounding, and liability, service performance objective classifications, and Chapter 10 provides recommendations for designing to reli- transmission considerations; protection theory and philoso- ability objectives.

Chapter 8 provides recommended mainte- phy; protection configurations; installation and inspection; nance practices. Ferroresonant transformers used as regulators face for Programmable Instrumentation. Interface systems in electronic power supplies and in other equipment are cov- used to interconnect both programmable and nonprogramm- ered. Guides to application and test procedures are included. The standard applies to the interface of in- Acid Batteries for Stationary Applications. Maintenance, test strumentation systems, or portions of them, in which the data schedules, and testing procedures that can be used to optimize exchanged among the interconnected apparatus is digital, the the life and performance of permanently installed, vented number of devices that may be interconnected by one contig- lead-acid storage batteries used for standby power applica- uous bus does not exceed 15, total transmission path lengths tions are provided.

This recommended practice also provides over the interconnecting cables do not exceed 20 m, and the guidance to determine when batteries should be replaced. Electric require longer distances, more devices, increased noise im- power systems in stationary generating stations that provide munity, or combinations of these.


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