EN 61064:1993

SLOVENSKI STANDARD
01-junij-2000
Acceptance tests for steam turbine speed control systems
Acceptance tests for steam turbine speed control systems
Abnahmeprüfungen für Dampfturbinen-Regelsysteme
Essais de réception des systèmes de régulation de vitesse des turbines à vapeur
Ta slovenski standard je istoveten z: EN 61064:1993
ICS:
27.040 Plinske in parne turbine. Gas and steam turbines.
Parni stroji Steam engines
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

NORME CEI
INTERNATIONALE IEC
INTERNATIONAL
Première édition
STANDARD
First edition
1991-04
Essais de réception des systèmes de régulation
de vitesse des turbines à vapeur
Acceptance tests for steam turbine
speed control systems
© IEC 1991 Droits de reproduction réservés — Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in
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1064©IEC – 3 –
CONTENTS
Page
FOREWORD 7
Clause
1 Scope and object 9
2 Normative reference 9
3 Terms, symbols, definitions and units 11
4 Guiding principles 15
4.1 Matters on which agreement shall be reached 15
4.2 Time of carrying out tests 17
4.3 Preparation for acceptance tests 19
4.4 Instruments 19
4.5 Test report 21
5 Speed governing system tests 21
5.1 Turbine at standstill 21
5.2 Turbine at no-load 21
5.2.1 Overview 21
5.2.2 Test procedure for determination of static characteristics 23
5.2.3 Determination of dead band 25
52.4 Speed range determination 25
5.2.5 Stability 25
5.3 Turbine on load 25
5.3.1 Overview 25
5.3.2 Test conditions 27
5.3.3 Load-steam flow demand relationship 27
5.3.4 Dead band determination - Overview 29
5.3.5 Dead band determination - Method 1 29
5.3.6 Dead band determination - Method 2 31
5.3.7 Determination of steady-state speed regulation - Method 1 31
5.3.8 Determination of steady-state speed regulation - Method 2 33
5.3.9 Determination of incremental speed regulation - Method 1 33
5.3.10 Determination of incremental speed regulation - Method 2 35
5.3.11 Stability 35
1064©IEC –5
Clause Page
5.4 Dynamic tests of the speed governing system by sudden load rejection
to no-load 35
5.4.1 Overview 35
5.4.2 Operating conditions 35
5.4.3 Test procedure 37
5.4.4 Test results 39
5.4.5 Stability 39
6 Overspeed protection system tests 39
6.1 Turbine at standstill 39
6.2 Turbine at no-load 39
6.3 Turbine on load 41
6.4 Dynamic testing of overspeed protection system by turbine trip from maximum
load 41
6.4.1 Overview 41
6.4.2 Operating conditions 41
6.4.3 Test procedure 41
6.4.4 Test results 41
Annex A - General guidance 45
Figures 50
- 7 -
1064©IEC
INTERNATIONAL ELECTROTECHNICAL COMMISSION
ACCEPTANCE TESTS FOR STEAM TURBINE
SPEED CONTROL SYSTEMS
FOREWORD
1) The formal decisions or agreements of the IEC on technical matters, prepared by Technical Committees on
which all the National Committees having a special interest therein are represented, express, as nearly as
possible, an international consensus of opinion on the subjects dealt with.
2) They have the form of recommendations for international use and they are accepted by the National
Committees in that sense.
3) In order to promote international unification, the IEC expresses the wish that all National Committees
should adopt the text of the IEC recommendation for their national rules in so far as national conditions will
permit. Any divergence between the IEC recommendation and the corresponding national rules should, as
far as possible, be clearly indicated in the latter.
This International Standard has been prepared by IEC Technical Committee No. 5: Steam
turbines.
The text of this standard is based on the following documents:
Six Months' Rule Report on Voting
5(CO)30 5(CO)33
Full information on the voting for the approval of this standard can be found in the Voting
Report indicated in the above table.
Annex A forms an integral part of this International Standard.

1064©IEC - 9 -
ACCEPTANCE TESTS FOR STEAM TURBINE
SPEED CONTROL SYSTEMS
1 Scope and object
This International Standard applies primarily to constant-speed steam turbines driving a.c.
generators at power stations, for testing speed control systems consisting of speed
governing and overspeed protection systems. It may also be used, where appropriate, for
other types of steam turbines.
The purpose of acceptance tests of steam-turbine speed governing and overspeed protec-
tion systems is to verify any criteria quoted in the manufacturer's guarantees. Such tests
will generally be carried out to check compliance with IEC 45-1. The criteria may include:
a) steady-state speed regulation (speed governing droop);
b) steady-state incremental speed regulation (incremental speed governing droop);
c) range of speed at no-load corresponding to the extreme settings of the speed
changer;
d) dead band of the speed governing system;
e) stability of the speed governing system;
ial
f) maximum transient increase of speed following full load rejection and any pa rt
load rejections, with the speed governing system in operation;
g) overspeed trip setting;
h) maximum transient overspeed following full load rejection on the failure of the
speed governing system.
Selection of the tests to be carried out and procedures for other tests not covered by this
specification shall be agreed upon between the manufacturer and the purchaser.
2 Normative reference
The following standard contains provisions which, through reference in this text, constitute
provisions of this International Standard. At the time of publication, the edition indicated
was valid. All standards are subject to revision, and pa rties to agreements based on this
International Standard are encouraged to investigate the possibility of applying the most
recent edition of the standard indicated below. Members of IEC and ISO maintain registers
of currently valid International Standards.
IEC 45: 1991, Steam turbines. Part 1: Specifications.

1064 ©IEC - 11 -
3 Terms, symbols, definitions and units
Using these rules it is recommended to employ the symbols, definitions and units that are
given in tables 1 and 2 and in figure 1. Table 1 lists basic terms, symbols, and units, while
Table 2 presents terms, symbols, definitions, and units of parameters specific to this
standard. IEC 45-1 definitions are also applicable.
Table 1
Symbol Unit
No. Term
L MW or kW
1 Power or load
p MPa or bar
2 Pressure
e K or °C
3 Temperature
w rad/s
4 Angular speed
n Hz, rev/s
5 Rotational speed
(rev/min)
U V
6 Voltage
7 Current / A
s mm, rad or (°)
8 Position or stroke of servomotors
h mm, rad or (°)
9 Position or stroke of valves
x mm, rad or (°)
10 Position or stroke of pi lots
T s
11 Time constant, characteristic time of element
t s
12 lime as independent variable
or other
13 Speed or load setting point y %

1064 0 IEC
- 13 -
Table 2
No.
Term Symbol
Definition Unit
Rated speed no
The speed at which the turbine is specified to operate Hz
at its rated output rev/s
rev/min
2 Minimum controlled speed
n The speed at no-load corresponding to the lower setting Hz
at no-load
of the speed changer rev/s
rev/min
Maximum controlled speed n2 The speed at no-load corresponding to the upper setting
Hz
at no-load
of the speed changer rev/s
rev/min
Temporary speed rise The
transient increase in turbine speed following a load Hz
rejection, with the speed governing system in operation. rev/s
The rated temporary speed rise applies If the rated output
rev/min
is rejected at rated speed
5 Maximum speed rise
The maximum transient increase in turbine speed Hz
following a load rejection, with the speed governing
rev/s
system inoperative. The rated maximum speed rise rev/min
applies if the rated output is rejected at rated speed
Maximum transient speed nm
The maximum transient increase in turbine speed following Hz
rejection of maximum capability by disconnecting the
rev/s
generator from the electrical system (with auxiliary supplies
rev/min
previously disconnected) and the speed governing system
in operation
Maximum transient overspeed noes
The maximum rotational speed following rejection of Hz
maximum capability by disconnecting the generator from rev/s
the electrical system (with auxiliary supplies previously rev/min
disconnected) and the speed governing system
inoperative
Overspeed trip setting ns Th
e speed at which the overspeed trip is set to operate Hz
rev/s
rev/min
9 Maximum continuous rating
L0 The power output assigned to the turbine-generator
MW
(MCR) (electrical generating
by the supplier, at which the unit may be operated for an
or
set)
unlimited time, not exceeding the specified role, at the kW
specified terminal conditions. This is the rating which will
normally carry
a guarantee of heat rate. The governing
valves will not necessarily be fully open. (Also referred to
as rated output, rated power or rated load)
10 Maximum capability
The
maximum power output that the turbine can produce MW
Lmax
with the governing valves fully open and at the spec
ified or
initi
al steam conditions. (Also referred to as valves-wide- kW
open capability or maximum load)
(Continued on page 15)
1064 ©IEC
- 15 -
Table 2 (continued)
No. Term Symbol Definition Unit
MW
11 Maximum overload capability Lod The maximum power output that the unit can produce
or
with the governing valves fully open, and with the
kW
terminal conditions specified for overload, e.g. with final
feed water heater bypassed or with increased initial
steam pressure
12 Dead band of the speed E The total magnitude of the change in steady-state speed %
(Dimension-
governing system (expressed as a percentage of rated speed), within which
there is no resultant change in the position of the govern- less)
ing valves. The dead band is a measure of the sensitivity
of the system
13 Steady-state speed regulation & The steady-state speed change, expressed as a per- 9'0
(speed governing droop) centage of rated speed, when the load of an isolated unit (Dimension-
is changed between rated load and zero load, with less)
identical setting of the speed governing system, assuming
a zero dead band
%
14 Steady-state incremental 61 The rate of change of the steady-state speed with respect
speed regulation (incremental to load at a given steady-state speed and load, assuming (Dimension-
less)
speed droop) a zero dead band. The value is the slope of the tangent
to the steady-sate speed/load curve at the load under
consideration
15 MPa
Steam flow demand do The signal generated in the speed governing system
which represents the required steam flow to the turbine V
or
A
16 Fluid pressure in control pc Fluid pressure at different points of the hydraulic control MPa
system
system
17 Stability The capability of the speed governing system to reduce
oscillations of the speed or load resulting from the action
of the governing system to amplitudes within acceptable
limits
4 Guiding principles
4.1
Matters on which agreement shall be reached
a) The parties to the test shall, prior to the tests, reach agreement on the object of the
tests and on the interpretation of the guarantees. Unless otherwise stated in the
contract, the control system functions shall be verified in accordance with 1.2.
b) Agreement shall be reached on the method of operation and on such matters as the
means of maintaining constant steam conditions and output. If the test conditions differ
from those specified in the test program, agreement shall be reached on the methods of
conversion of experimental values.

1064©IEC - 17 -
c) Methods of testing other than those stated in this standard may be used by mutual
agreement between the parties. For example, the methods given in national codes to
determine steady-state speed regulation, dead band and other characteristics of the
control system may be used. However, comparison of the quality of different control
systems shall be accomplished only by using the methods stated in this standard. In
the absence of such written agreement, it is understood that the provisions of this stan-
dard are to be applied.
d) Agreement shall be reached on the method and responsibilities for calibration of the
instruments.
e) The parties to the test may designate a person to direct the test and another person
to arbitrate in the event of disputes regarding test conditions and procedures, or accu-
racy of measurement and obse
rvations.
f) Accredited representatives of the purchaser and the manufacturer may be present
at the tests to verify that they are conducted in accordance with this standard and the
agreements made prior to the tests.
g) The test results shall be reported as calculated from the test observations, due
account being taken of any corrections resulting from calibration of the instruments.
Any tolerances or deviations from contractual values are a commercial matter between
purchaser and manufacturer, and are not dealt with in this standard. Agreement shall
be reached on the contents and the time period for preparation of the test repo rt.
h) If not specified in the contract, the following items shall be agreed upon between
the purchaser and manufacturer of the turbine, generator and control system:
1) supply of materials and special instrumentation to car ry out the test;
2) provision of access to the necessary measuring points on the turbine, generator
and control system;
3) time allowed for installing, pre-testing and disassembly of the test instrumen-
tation;
4) tests to be carried out at the manufacturer's works and at the power plant;
5) provision of necessary additional personnel and definition of their duties;
6) liability in case of accidents, loss or damage
...