IEEE 125

Description / Abstract: Foreword 

(This Foreword is not a part of ANSI/IEEE Std 125-1988, IEEE Recommended Practice for Preparation of Equipment Specifications for Speed-Governing of Hydraulic Turbines Intended to Drive Electric Generators).

The 1977 revision of IEEE Std 125 was prepared by a joint IEEE-ASME Working Group formed in December of 1971. The personnel of this Working Group were appointed by J. T. Madill, Chairman, Hydroelectric Power Subcommittee, IEEE, at the direction of W. S. Morgan, Chairman, Power Generation Committee, IEEE, in cooperation with ASME.

The 1988 revision of the standard was initiated in 1982 by R. D. Handel, Chairman, Hydroelectric Power Subcommittee, Power Generation Committee, IEEE, in cooperation with W. O. Hays, Director, Power Test Codes, ASME. The Working Group that formulated the 1988 standard included representatives from IEEE and ASME.

The standard includes the latest practices on the North American continent and, insofar as possible, has been made consistent with ANSI/ASME Std PTC29-1980 (R1985), Speed-Governing Systems for Hydraulic Turbine-Generator Units, and IEC Std 308-1970, International Code for Testing of Speed Governing Systems for Hydraulic Turbines.

As the title implies, this document is a recommended practice and not a complete specification. It has been developed to be used by prospective purchasers of hydraulic turbine governors in preparing detailed procurement speci˝cations for such equipment. In certain cases, performance criteria such as temperature range or fluid velocity, representative of North American practice, have been included; the specification writer may wish to verify their applicability to his job.

Section 2. defines terms, functions, and characteristics as commonly used in North America. Wherever possible, the 1988 revision utilizes symbols adopted by IEC Std 308-1970, International Code for Testing of Speed Governing Systems for Hydraulic Turbines. A number of definitions covering detailed aspects of control system frequency response have been deleted from the 1988 revision, as these definitions are well covered in ANSI Std MC85.1M-1981, Terminology for Automatic Control.

Section 3. describes specific components that may be included in a governor system. The purchaser should specify only those components he feels are required to interface with his equipment. The practice should not be incorporated verbatim, as it contains certain explanatory comments directed to the specification writer. When convenient, these explanatory comments have been enclosed in parentheses. The 1988 revision addresses equipment aspects that have gained prominence since release of the 1977 standard, in particular those related to electric-hydraulic governors. Included are new guide specifications on power supply design (reliability and redundancy considerations), transient immunity (emi and rfi), electronic components, test facilities, and accessories such as generation control circuits. Also, a number of the equipment specifications have been revised to reßect the latest industry practices and to provide consistency in terminology. In particular, clarification has been provided on the sizing of the hydraulic pressure tank for adjustable blade and impulse turbines. In addition to the special considerations affecting electric governors outlined above, guide specifications have been added for items common to both non-electric and electric governors. These include auxiliary components for pump turbines, cabinet construction, ac and dc control power, rotor creep detector, fire protection system, emergency stop controls, and hydraulic pressure supply system accessories.

Section 4. defines the performance characteristics of a good governor system and adjustments and tests to obtain and confirm the desired performance. Prior to or concurrent with the writing of the specification, the purchaser should make studies to determine the required performance and the adjustments associated with that performance. The purchaser should also determine what tests are necessary to confirm that the desired performance has been obtained. Specifications related to the adequacy of the damping system have been clarified in the 1988 revision. A paragraph has also been included on the requirements for stability studies to be conducted by the governor manufacturer.

Section 5. is intended to make suf˝cient information available to the purchaser so that he can assure himself that the governor equipment will interface properly with other equipment. It is also intended to provide adequate information for maintenance purposes.

Section 6. deals with the criteria for acceptance tests.

Section 7. lists the data that will be furnished by the purchaser. Tests for evaluating the speed control performance, included in Appendix I, have been clarified in the 1988 revision to reflect the current practices of users.

At the time of approval of the 1977 standard the personnel of the Joint IEEE/ASME Working Group on Updating IEEE Specification No 125 Covering Speed-Governing of Hydraulic Turbines Intended to Drive Electric Generators was as follows:

L. M. Hovey, (Chairman)

E. A. Cooper

L. Eilts

J. Roddy Huff

C. Humphreys

G. Dugan Johnson

D. G. McFarlane

G. R. Meloy

P. L. Moran

R. M. Rockwell

F. R. Schleif

D. A. Shearer

Members of the Joint IEEE/ASME Working Group, which prepared the 1988 revision of this standard, are as follows:

J. H. Gurney, (Chairman)

J. C. Agee

L. E. Eilts

R. W. Fazalare

J. H. Jones

J. E. LeClair

P. Micale

M. J. Minor

G. H. Mittendorf, Jr.

L. Pereira

F. R. Schleif

D. A. Shearer

E. T. Voelker

T. E. Whittemore

The following persons were on the balloting committee that approved this document for submission to the IEEE Standards Board:

M. S. Baldwin

I. B. Berezowsky

L. D. Boydstun

S. R. Brockschink

J. B. Cannon

R. W. Cantrell

R. L. Castleberry

E. F. Chelotti

R. E. Cotta

P. M. Davidson

D. Diamant

G. Engmann

D. I. Gorden

R. K. Gupta

J. H. Jones

C. E. Kneeburg

S. B. Kuznetsov

P. Landrieu

J. E. LeClair

P. A. Lewis

J. T. Madill

O. S. Mazzoni

D. R. McCabe

G. R. Meloy

M. W. Migliaro

R. E. Penn, III

C. R. Pope

R. J. Reiman

D. E. Roberts

E. P. Rothong

J. E. Stoner, Jr

T. R. Whittemore

R. Zweigler

When the IEEE Standards Board approved this standard on March 10, 1988, it had the following membership:

Donald C. Fleckenstein, (Chairman)

Marco Migliaro, (Vice Chairman)

Andrew G. Salem, Secretary

Arthur A. Blaisdell

Fletcher J. Buckley

James M. Daly

Stephen R. Dillon

Eugene P. Fogarty

Thomas L. Hannan

Kenneth D. Hendrix

Theodore W. Hissey, Jr.

Jack M. Kinn

Frank D. Kirschner

Frank C. Kitzantides

Joseph L. Koepfinger*

Irving Kolodny

Edward Lohse

John E. May, Jr.

Lawrence V. McCaIl

L. Bruce McClung

Richard E. Mosher

L. John Rankine

Gary S. Robinson

Frank L. Rose

Helen M. Wood

Karl H. Zaininger

Donald W. Zipse

*Member Emeritus

Scope

This practice shall apply to mechanical-hydraulic or electric-hydraulic type governors for all types of hydraulic turbines including but not limited to the following types:

a) Impulse Turbines

b) Francis Turbines

c) Fixed Blade (Axial or Mixed-Flow) Turbines

d) Adjustable Blade (Axial or Mixed-Flow) Turbines

e) Pump Turbines

It is recommended that the issue in effect on the date of invitation to bid of ANSI/ASME PTC29-1980 (R1985), Speed- Governing Systems for Hydraulic Turbine-Generator Units [4],¹ be used with this practice.

Only those paragraphs that apply to the specific equipment to be purchased should be used when preparing the procurement specifications.