A Miniature A-C. Transmission System For the Practical Solution of Network and Transmission-System Problems

Schurig, O. R.

doi:10.1109/t-aiee.1923.5060913

Cited by 7 publications

(1 citation statement)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Mr, Schurig finds that with standard portable instruments, the current must be 5 or 10 amperes with 200 or 100 volts respectively to keep errors safely below 10 per cent. 2 These errors are a result of the relatively large current taken by standard dynamometer instruments. The voltmeter and watt meter potential coils together introduce about 1.6 per cent error in the current on the 5-ampere représenta-…”

Section: Artificial Representation Of Power Systems 25mentioning

confidence: 99%

Artificial representation of power systems

Spencer

Hazen

1925

J. A.I.E.E.

View full text Add to dashboard Cite

Synopsis.-The size and complexity of present day power systems have increased to the point where the prediction of the behavior of the system by analytical methods is more and more difficult. The solution of commercial networks by Kirchhoff s Laws or by cut and try methods, even with the help of star-delta trans formations, leads to such involved equations that the need for simpler methods is keenly felt. Increasing attention has been given to various methods of representing power systems in miniature so that an experimental solution may be substituted for an algebraic one. The d-c. short circuit calculating table is a satisfactory and relatively simple means of determining short circuit currents in net works, but is too inaccurate to give satisfactory solution under normal operating conditions. An a-c. artificial representation of power networks in miniature has been developed by 0. R. Schurig of the General Electric Company who used 3.75-kw. 110-volt three-phase generators as power stations. Actual transformers are used, while lines and loads are made up of conveniently arranged lumped units of inductance, capacity, and resistance. This apparatus has been in satisfactory operation for several years. Evans and Bergvall of the Westinghouse Electric and Manu facturing Company used a test floor setup to check experimentally the theory of long line stability. Powers of about 500 kv-a. were used. The present paper presents a method of artificial representation on a laboratory scale, decreasing the size of the apparatus and in creasing the precision of the results. All rotating apparatus has been eliminated. Generators are represented by phase shifting transformers; transformers by their equivalent circuits, and lines by lumped constants. A description of the apparatus used by the writers is presented, together with the results which were obtained by its use in the solution of several typical problems. An analytical check on one of the examples is given, showing a precision of better than 1 per cent. PURPOSE AND SUMMARYT HE purpose of this paper is to describe briefly the work done by the authors under the direction of Dr. V. Bush, in the Research Laboratory of the Masschusetts Institute of Technology in designing, building, and testing apparatus for setting up miniature networks, using generating station powers of 100 watts or less. Complete voltage, current, and power solutions were made on several arbitrary networks. The repre sentation was single-phase, using phase-shifting trans formers for generating stations, and a vacuum tube voltmeter drawing absolutely negligible current for measuring potentials.

show abstract

Section: Artificial Representation Of Power Systems 25mentioning

confidence: 99%

Artificial representation of power systems

Spencer

Hazen

1925

J. A.I.E.E.

View full text Add to dashboard Cite

show abstract

Harold Hazen and the theory and design of servomechanisms

Bennett

1985

International Journal of Control

View full text Add to dashboard Cite

Artificial Representation of Power Systems

Spencer

Hazen

1925

Trans. Am. Inst. Electr. Eng.

View full text Add to dashboard Cite

Synopsis.-The size and complexity of present-day power conveniently arranged lumped units of inductance, capacity, and systems have increased to the point where the prediction of the resistance. This apparatus has been in satisfactory operation for behavior of the system by analytical methods is more and more several years.difficult. The solution of commercial networks by Kirchhoff's Laws Evans and Bergvall of the Westinghouse Electric and Manuor by cut and try methods, even with the help of star-delta trans-facturiing Company used a test floor set-up to check experimentally formations, leads to such involved equations that the needfor simpler the theory of long line stability. Powers of about 500 ky-a. were used. methods is keenly felt. Increasing attention has been given to various methods of representing power systems in miniature so that The present paper preasent thod of atificialrrepresenaion an experimental solution may be substituted for an algebraic one. ocreasing the sizeioftheoaparatusandtiThe d-c. short circuit calculating table is a satisfactory and relatively simple means of determining short circuit currents in net-All rotating apparatus has been eliminated. Generators are works, but is too inaccurate to give satisfactory solution under normal represented by phase shifting transformers; transformers by their operating conditions. equivalent circuits, and lines by lumped constants. A description An a-c. artificial representation of power networks in miniature of the apparatus used by the writers is presented, together with the has been developed by 0. R. Schurig of the General Electric Company results which were obtained by its use in the solution of several who used 3.75-kw. 110-volt three-phase generators as power stations. typical problems. An analytical check on one of the examples is Actual transformers are used, while lines and loads are made up of given, showing a precision of better than 1 per cent. PURPOSE AND SUMMARY any feeder or causing excessive voltage drop? With a T HE purpose of this paper is to describe briefly the given load on the system, what distribution among the work done by the authors under the direction of various generating stations gives the best voltage regu-Dr. V. Bush, in the Research Laboratory of the lation, the minimum losses and best distribution of load Masschusetts Institute of Technology in designing, over the various feeders? If a new tie line be put in, building, and testing apparatus for setting up miniature will it relieve or add to existing overload on the other networks, using generating station powers of 100 watts lines under some conditions? The answer to these or less. Complete voltage, current, and power solutions questions is found in numerous solutions of the network were made on several arbitrary networks. The repre-under normal steady state operation. sentation was single-phase, using phase-shifting trans-Another group of problems is presented when unusual formers for generating stations, and a vacuum tube conditions, such as short circuits, occur....

show abstract

A Miniature A-C. Transmission System For the Practical Solution of Network and Transmission-System Problems

Cited by 7 publications

References 1 publication

Artificial representation of power systems

Artificial representation of power systems

Harold Hazen and the theory and design of servomechanisms

Artificial Representation of Power Systems

Contact Info

Product

Resources

About