इंटरनेट मानक

Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to
information for citizens to secure access to information under the control of public authorities,
in order to promote transparency and accountability in the working of every public authority,
and whereas the attached publication of the Bureau of Indian Standards is of particular interest
to the public, particularly disadvantaged communities and those engaged in the pursuit of
education and knowledge, the attached public safety standard is made available to promote the
timely dissemination of this information in an accurate manner to the public.

“जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न' 5 तरफ”

Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru
“The Right to Information, The Right to Live” “Step Out From the Old to the New”

IS 13364-2 (1992): ac generators driven by reciprocating

internal combustion engine, Part 2: Rated above 20 kVA and
upto 1250 kVA [ETD 15: Rotating Machinery]

“!ान $ एक न' भारत का +नम-ण”

Satyanarayan Gangaram Pitroda
“Invent a New India Using Knowledge”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता ह”

है”
ह
Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”
 IS 13364 ( Part 2 ) : 1992
( Reaffirmed 2003 )

Indian Standard
AC GENERATORS DRIVEN BY RECIPROCATING
INTERNAL COMBUSTION ENGINES -
SPECIFICATION
PART 2 ALTERNATORS RATED ABOVE 20 kVA AND UP TO 1250 kVA

UDC 621’3 13’3-843’2’027’8

0 BIS 1992

BUREAU OF INDIAN STANDARDS

MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002

March 1992 Price Group 5

Rotating Machinery Sectional Committee, ET 15

FOREWORD

This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by
the Rotating Machinery Sectional Committee had been approved by the Electrotechnical Division
Council.

This is a comprehensive standard covering generators coupled to internal combustion engines

without distinction of output and voltage, with the exception of machines intended for special
applications, such as machines for traction vehicles, marine service and air transport.

In formulation of this standard, assistance has been derived from the following publications:

IEC : Pub 34-l- 1983 Rotating Electrical Machines : Part 1 Rating and performance. Now
International Electrotechnical Commission ( IEC ).

VDE : 0530 : 1984 Rotating Electrical Machines, issued by VDE ( Germany ).

IS 4722 : 1968 Rotating Electrical Machines, issued by Bureau of Indian Standards.

BS 5000 Part 99-1974 ( 1981 ) Specification for Rotating Electrical Machines of Particular
Types or for Particular Applications, Part 99 Machines for Miscellaneous Application.
Now British Standards Institution ( BSI ).

ANSI C50. IO- 1977 General Requirements for Synchronous Machines. Now American
National Standards Institution.

NEMA MG 1.22-1982 Motors and Generators, issued by NEMA ( USA ); and

For the purpose of deciding whether a particular requirement of this standard is complied with, the
final value, observed or calculated, expressing the result of a test, shall be rounded off in accordance
with 1S 2 : 1960 ‘Rules for rounding off numerical values ( revised)‘. The number of significant
places retained in the rounded off value should be the same as that of the specified value in this
standard.
 IS 13364 (Part 2) : 1992

Indian Standard
AC GENERATORS DRIVEN BY RECIPROCATING
INTERNAL COMBUSTION ENGINES -
SPECIFICATION
PART 2 ALTERNATORS RATED ABOVE 20 kVA AND UP TO 1250 kVA

1 SCOPE 4 Exposure to ambient temperatures above 40%

or below OOC.
1.1 This standard (Part 2) specifies the requirement
e) Exposure to cooling media where the tem-
for ac generators togEther with their exciters driven
perature values depart from those listed irithis
by reciprocating internal combustion engines and
standard.
generators having rated outputs above 20 kVA and
up to 1 250 kVA at the specified conditions. fl Exposure to abnormal shock or vibration.

1.2 This standard covers generators with the following g) Where departure from rated voltage or fre-
excitation systems: quency, or both exceed limits given in this
standard.
a>Direct excitation adopting static exciters
h) Where the phase voltages, or currents, orboth,
(magnetic or electronic);
are severely unbalanced.
b) Brushless AC exciters;
j> Where low noise levels are required.
4 DC exciters; and

d) Pilot exciters besides exciters in (b) or (c) k) Exposure to external mechanical loads in-
volving thrust or overhang.
above.
The excitation power in these cases is derived from the 4 Subject to operation in an inclined position.
prime mover of the alternator. 4 Subject to intermittent, periodic, or varying
duty.
The closed loop (involving an automatic voltage regu-
lator) or open loop of excitation control may be used in
1.4 This standard does not apply to the following types
the excitation systems.
of machines for which other Indian Standards are
already available:
1.3 This standard does not cover generators intended
for use in following special applications. However, a) Turbine type generators (see IS 5422 : 1979),
machines built to this standard may be adopted with and
suitable modification for these aonlications when
agreed to between the manufacture&td the purchaser/ b) Electrical generators for use in ships [see IS
user. 10242 (Part 3/Set 1) : 19831.

a) Exposure to:
2 REFERENCES
1) abrasive or conducting dust or chemical
fumes, The Indian Standards listed in Annex A are necessary
adjuncts to this standard.
2) combustible dust,

3) dusts/fumes of explosives,
3 TERMINOLOGY
4) flammable gases,
3.0 For the purpose of this standard, the following
5) lint,
definitions shall apply.
6) nuclear radiation,
3.1 Machine
7) oil vapour,
8) salt air, and The AC generator to which this standard applied.
9) steam.
3.2 Rating
b) Operation in mines, entirely enclosed boxes,
poorly ventilated rooms, damp or very dry Numerical values of the electrical and mechanical
places. quantities with their duration and sequences assigned
to the machine by the manufacturer and stated on the
c) Operation at speeds other than rated (this rating plate for specified conditions.
excludes normal overspeed).

1
IS 13364 (Part 2) : 1992
3.3 Load 3.10 Excitation Voltage
All the numerical values of the electrical and mechani- The voltage marked on the rating plate of a machine
cal quantities that signify the demand to be made on a and required for excitation at rated output.
rotating machine by an electrical circuit or a mecha-
nism at a given instant. 3.11 Efficiency
The ratio of output power to the input power (ex-
3.4 Rated Output
pressed as a percentage).
The apparent electric power available at terminals
expressed in. volt-amperes or kilo volt amperes to- Power Output of Machine
i.e. Efficiency = Xl00
gether with the specified power factor frequency and Power Output of Machine
voltage. + Power Loss in the Machine

3.5 No Load 3.12 Routine Tests

The state of a machine rotating at normal speed under Tests carried out on each machine to check the essential
rated conditions but when no output is taken out of it. requirements which are likely to vary during produc-
tion.
3.6 Overload
3.13 Type Tests
Any load inexcess of rated load expressed numerically
in per unit or percentage of rated output. Tests carried out to provide conformity with the re-
quirements of this standard. These are intended to
3.6.1. Sustained Overload prove the general qualities and design of a given type
of machine.
An overload sustained for a sufficiently long period to
affect appreciably the temperature of the machine. 3.14 Voltage Terms
3.6.2 Momentary Overload These terms describe a generator under the control of
its normal excitation and voltage regulation system.
An overload the duration of which is so short as not to
affect appreciably the temperature of the machine. 3.14.1 Rated Voltage (UN)
3.6.3 Balanced Load The line-to-line voltage at the terminals of the genera-
tor at rated output.
A symmetrical 3-phase load having equal numerical
value of impedance and power factor of load in all the 3.143 No Load Voltage (UJ
3-phases.
The line-to-line voltage at the terminals of the genera-
3.6.4 Unbalanced Load tor at rated frequency and at no load.
A load having different magnitude and power factor 3.143 Range of Voltage Adjustment (AU,)
loads in all or any two of the 3-phases. It is normally
expressed as ratio of the difference of maximum and Range of maximum possible upward and downward
minimum line currents to the maximum line current as adjustment of voltage at generator terminals (U and
follows: U ) at rated frequency, for all loads between ngoad
an3 rated load and within the agreed range of power
LX - Lifl factors.
LX 3.14.4 Inherent Voltage Regulation (RsIu)

3.7 Duty The maximum change in voltage expressed as per-

centage of the rated voltage, when the load changes
Statement of the load including no load, rest and de- from rated load at rated voltage, speed and power
energized period to which the machine is subjected factor to any lower load, including no load, without
including their duration and sequence in time. change in speed and excitation current, taking into
account the effect on governor and automatic voltage
3.8 Duty Type regulation.

Aconventionalperiodicdutyconsistingofoneormore 3.145 Transient Voltage Deviation (R,U)

sets of loads remaining constant for the durations
Maximumdeviationofvoltageafterasuddenspecified
specified.
load change from a voltage previous to steady state
level at rated speed and specified power factor.
3.9 Thermal Equilibrium

The state reached when the observed temperature rises 3.14.6 Voltage Recovery Time (zu)
of the several parts of the machine do not vary by more The time interval from the point when the’ voltage
than 2.0% over a period of one hour. departs from the specified steady state voltage

2
 IS 13364 (Part 2) : 1992
regulation band after a load change until the voltage a) The common voltage differing from its rated
again returns to and remains within this band. value by not more than +5 percent, or
b) The frequency differing from its rated value by
3.14.7 Voltage Regulation Characteristics (-)
not more than 23 percent, or
Curves of terminal voltage as a function of load
c) Any combination of (a) and (b).
current at given power factor rated and frequency.
In the case of operation at extreme voltage limits, the
3.148 Voltage Modulation (Modulation Amplitude)
temperature rise limits specified in 11 shall not exceed
c,o, by more than 5%. Machines when operated under the
Voltage modulation is a quasi&periodic voltage varia- abnormal conditions of voltage and frequency varia-
tion about a steady state voltage at frequencies below tion may not necessarily have their performance in
the fundamental of service frequency expressed as a accordance with this standard.
percentage of the rated voltage at rated frequency and
uniform drive. 5 TYPE OF ENCLOSURES

3.14.9 Angular Displacement of Polyjhzse System For machines covered by this standard, the speci-
NJ fication for types of enclosures shall be as given in
IS 4691 : 1985.
Electrical angular displacement of the generator phase
voltage vector relative to the corresponding phase 6 COOLING SYSTEMS
voltage vector of a symmetrical polyphase system
(with three phase system 1200 at virtually non- The machines covered by this standard shall have one
deforming and virtually balanced loads between no of the cooling systems.given in IS 6362 : 1971.
load and rated load, expressed in electrical degrees).
7 PREFERRED VOLTAGES, FREQUENCY
3.14.10 Maximum Voltage Unbalance (6~) AND OUTPUTS
The maximum voltage unbalance is the ratio of the
negative sequence or the zero sequence voltage com- 7.1 Preferred Voltages
ponents to the positive sequence voltage components at For the purpose of this standard, the preferred voltages
no load. shall be in accordance with IS 12360 : 1988.

4 SITE CONDITIONS 7.2 Frequency and Number of Phases

For AC generators the frequency shall be the standard
4.0 The following shall constitute the normal site
frequency of 50 Hz.
conditions.
7.4.1 The standard number of phases for AC genera-
4.1 Altitude and Temperature tors shall be three or one.
Machines shall be designed for the following site 7.3 Preferred Outputs
conditions unless otherwise agreed to between the
manufacturer and the purchaser. The preferred output ratings for AC generators above
20 kVA and up to 1 250 kVA are:
4.1.1 Altitude
22.5,25,27.5,31,35,40,45,50,56,63,70,80,90,100,
Altitude not xceeding 1 OOOmetres.Machines intended 112,125,140,160,180,200,224,250,280,315,355,
for service on sites where the altitude is in excess of 400,450,500,560,630,710,800,900,1000,1120and
1000 me&s are covered in 6.3 of IS 12802 : 1989. 1250.

4.1.2 Temperature 7.4 Preferred Power Factor

The cooling air or gas temperature not exceeding The standard power factor for the loads will be consid-
WC. Machines intended for service with a cooling ered as 0.8 lag. Other power factor requirements canbe
mediumtemperatureotherthan400Carecovered in6.3 agreed upon by the purchaser after consulting the
of IS 12802 : 1989. generator/prime mover manufacturer.

4.2 Voltage and Frequency Variation 7.5 Voltage Characteristics

Machines that are connected in parallel with supply The generators to this standard will meet the require-
mains shall be capable of delivering rated output ments of any one grade agreed to between the purchaser
with: and thesupplierofcharacteristicsdescribed inTable 1.

3
IS 13364 (Part 2) : 1992
Table 1 Voltage Characteristics
(Chse 7.5)

Sl No. Parameter Symbol unit Ref to Grade’

ClPUSe
V”.l VG2 VG3 VG4

(1) (2) (3) (4) (5) (6) (7) (8) (9)

0 Range of Voltage Adjustment AUs 96 3.14.3 25 +5 25 Ah@?

ii) Inherent % 3.14.4 25 22.5 21 AMC2

Voltage Regulation RP

iii) Transient Voltage Behaviour

after sudden symmetric 100
percent increase in load at rated
voltage and power factor between
0.4 and zero lagging

a) Transient Voltage Drop RdJJ 96 3.14.5 32 22 15 AhE2

b) Voltage Recovery Time ‘T: S 3.14.6 2.5 1.5 1.0 AMC?

Y
iv) Transient Voltage Behaviour
after sudden rejection of 100
percent load at rated power
factor and constant speed

a) Transient R,.U % 3.14.5 37 27 20 AMca

Voltage Rise

b) Voltage Recovery Time z” S 3.14.6 2.5 1.5 1.5 Ah4cr

v) Voltage Modulation $ 46 3.14.8 1.0 1.0 1.0 AMc2

vi) Maximum Voltage 8U % 3.14.10 i.0 1.0 1.0 1.0
Unbalance on no load

t) Grades VGl to VG4 are voltage regulation grades not necessarily associated with engine classes.
r) AMC = By agreement between the manufacturer and the customer.

NOTE - The following tests shall be subject to agreement between the manufacturer and the purchaser :
9 Range of voltage adjustments,

ii) Voltage recovery time, pl

iii) Voltage modulation, and

iv) Angular displacement of polyphase system.

8 IRREGULARITIES OR WAVEFORM It is recommended that users of all:matos will

inform the generator manufacturer whenever the
8.1 The generators to this standard shall meet any one thyrister loads or furnace loads are encountered.
of the requirements covered under 8.3,8.4 and 8.5.
If none are stated by the purchaser during enquiry, 8.3 Telephone Harmonic Factor
requirements shall apply. The waveform measurement
shall be done on open circuit rated voltage at rated The requirements will be as per 9.1 of IS 4722 : 1992.
speed.
8.4 Waveform Deviation
8.2 Non Linear Loads
The line-to-line voltage waveform shall be obtained
The non linear loads (thyrister loads) introduce har- with the generator running at rated voltage at normal
monics in the alternator armature current. This in fact speed and on open circuit on an oscillographic re-
disturbs the generator voltage waveform which may corder. The rms value of the voltage is also measured,
lead to malfunctioning of the system. A standard a sinusoidal voltage waveform of the fundamental
alternator may supply 20 to 40 percent non linear loads computed from the rms value is superposed on the
along with conventional loads, may be of 80 to 60 recorded waveform. The waveform deviation is ex-
percent depending upon the design of thyrister panel pressed as the difference in any of the instantaneous
and alternatorparameters. However, this has tobe done values of the actual waveform recorded and the sinu-
by an agreement between the manufacturer and the soidal waveform of fundamental to the peak value of
purchaser. fundamental.

4
 IS 13364 (Part 2) : 1992
a- b 12 OVERLOAD
Waveform deviation (percent) = - xl00
c
12.1 Momentary Excess Current for Generators
where c = peak value of fundamental.
A generator rated in accordance with this standard
The waveform deviation will not exceed the following shall be capable of withstanding for not less than 15
limits : seconds, a current 50 percent in excess of its rated
RVA Waveform Deviation current after having attained the thermal equilibrium
corresponding to the rated load, the voltage being
Above 20 kVA and 10 percent maintained as near the rated value as possible consis-
up to 300 kVA tent with the maximum capacity of the prime mover.
Above 300 kVA and 8 percent The exact value of the voltage is not important.
up to 1250 kVA
12.2 Exciters
8.5 Harmonic Distortion Factor
The exciters shallbe capable of deliveringthe required
A suitable wave analyser is used to measure the funda- excitation current for overloads specified in 12.1.
mental and the individl*sl harmonicsofthe opencircuit
line-to-line rated voltage at normal speed. The har- 12.2.1 The exciters shall be rated 1.25 times the full
monic distortion factor is computed as under : load (1 ted) conditions.

I
\E;!,+Ez,+.
Harmony Distortion
. . . . . . . .+E% 13 LIMITS OFVIBRATION(Underconsideration)

= E 14 COMMUTATION

where 14.1 CommutationofDCExcitersExcludingThose

of the Brush Shifting Type
E = nns, value of line-to-line voltage of generator
E7,+F3+ . . . . . . . ..+EZn = m~s valuesofn The exciter shall work with fixed brush setting from
numbers of residual harmonics of line-to-line voltage no load to the momentary overload specified in 12
of generator, (where n = 2,3,4,5) without injurious sparking or injury to the computator
or brushes.
The harmonic distortion factor should be within the
14.2 The slip ring brushes of AC generators should be
following limits :
free of injurious sparking or injury to slip ring or
Harmonic Distortiqn Factor
brushes from no load to momentary overload specified
RVA
in 12.
Above 20 kVA and 5 percent
14.3 Annex B of IS 4722 : 1992 gives the details of the
up to 300 kVA
grades of sparking that may be used in specifying the
Above 300 kVA and 3 percent degree of sparking.
up to 1250 kVA
15 EFFICIENCY AND VOLTAGE
NOTE - A direct measurement of harmonic distortion factor
may be done with suitable instruments. REGULATION

9 DUTY 15.1 The purchaser shall specify the rated conditions

in terms of voltage, output kVA, power factor and
9.1 The generators covered by this standard shall be speed. The efficiency shall be determined by input-
of continuous duty unless specified otherwise by the output method or any method specified in IS 4889 :
purchaser. 1968. The voltage regulation shall be calculated in
accordance with 3.14.4. The tolerances applicable to
Other duties can be specified as per one of the requim- the determined values of efficiency and voltage regu-
mentr in IS 4722 : 1992. The manufacturer may select lation shall be according to 16.
a suitable machine from his standard list to meet this
duty, based on data supplied by the purchaser. 15.1.1 In case of brushless generators, the efficiency
may be determined by assuming the design value’of
10 EARTHING the mainfield current and the design efficiency value
of exciters.
Earthing of the machine shall be done in accordance
with the relevant provisions of IS 3043 : 1987. 16 TOLERANCES

11 TEMPERATURE RISE LIMITS Unless otherwise specified, tolerances shall be in ac-

cordance witb Table 2. Where ,a tolerance is stated in
The generators to this standard shall meet the limits of only one direction, the tolerance in the other direc-
temperature rise covered in IS 4722 : 1992. bon is considered unimportant.
*

5
IS 13364 (Part 2) : 1992
Table 2 Schedule of Tolerances
(Clause 16)

Sl Na Item TdaUecS

0) (2) (3)

i> Efficiency (n)

a) By Summation of Losses :
i) Machines up to 50 kW - 15 percent of (l-n)

ii) Machines above 50 kW - 10 percent of (l-n)

b) By input-output test - 15 percent of (l-n)

ii) Total losses applicable + 10 percent of the total

to machines above 50 kW losses

iii) Inherent steady state voltage + 20 percent of the

reg?lation of generators guaranteed value

iv) Peak value of short-circuit 2 30 percent of the

current of an AC generator. guaranteed value
under specified conditions

v) Steady shortcircuit current 2 15 percent of tbe

of an AC generator at guaranteed value
specified conditions

vi) Moment of inertia or stored + 10 percent of tbe

energy guaranteed value

17 TERMINAL MARKINGS 19 INFORMATION TO BE GIVEN WIW

ENQUIRY AND ORDER
Terminal markings, when used, shall be in accordance
with IS 4728 : 1975. The user should give complete information on the
generators at the time of enquiry. Annex B may be
18 RATlNG PLATE referred for providing such details.

18.1 A rating plate stating the following shall be 20 TESTS

supplied with each machine :
20.0 General
4 A reference to the designation of this standard The tests specified in this clause shall normally be
that is, Ref to IS 13364 (Part 2) : 1992 carried out at the manufacturer works.
b) Indication of source of manufacturer; 20.1 Test Certificates
4 Manufacturer’s number and frame reference; 20.1.1 Unless otherwise specified when inviting ten-
4 AC generator; ders, the purchaser, if so desired by the manufacturer,
shall accept manufacturer’s certificate as evidence of
e) Frequency, in cycles per second; the compliance of the machine with the requirements
f) Number of phases; of 203.1 and 12 on a machine identical in essential
details with the one purchased together with routine
id Rated output in kVA or MVA, tests on each individual machine. In the case when a
h) Rated voltage and winding connections; batch of 10 or more similar machines are supplied on
one order, type tests, as specified, shall be made on one
3 Current, in amperes at rated output; of these machines if the purchaser so requires.
k) Power factor; 20.13 Certificates of routine tests shall show that the
machine purchased has been run and has been found
4 Type of duty;
to be electrically and mechanically sound and in
4 Speed, in revolutions per minute; working order in all particulars.
P) Excitation current and voltage at rated output; 20.13 If so specified, when inviting tenders, tests shall
be carried out at the manufacturer’s works in the
9) Coolant temperature; presence of the purchaser or his representative to
r) Class of insulation; and ensure that the machine complies in every respect
with the requirements of 11,12,21 and 22 qnd also of
s) Additional information, as required. steady state regulation and efficiency.
6
 IS 13364 (Fart 2) : 1992
20.1.4 Certificates of all type tests together with a 21 HIGH VOLTAGE TEST
record of alterations whether essential or not, which
High voltage test will be conducted on the machine
have been made to the machine since the tests were
with exciter as per IS 4722 : 1992.
carried out, shall be kept available by the manufacturer
for inspection.
22 INSULATION RESISTANCE TEST
20.2 The procedures laid out in IS 7132 : 1973 and
IS 7306 : 1974 for testing the generators other than The test requirements and the procedure shall be in
accordance with IS 4722 : 1992.
single phase and evalutating the machine param-
eters will in general apply to the generators covered
23 OVERSPEED
by this standard.
23.1 All machines shall be designed to withstand a
20.3 Synchronours Generators speed of 1.2 times the rated speed unless specified
otherwise.
203.1 Type Tests
23.2 An overspeed test is not normally considered
The following shall constitute the type tests: necessary but may be performed when this is speci-
fied and has been agreed to between the manufac-
4 Measurement of resistance, turer and the purchaser at the time of the order. An
overspeed test shall be considered as satisfactory is no
b) Phase sequence test (for S-phase generators
permanent abnormal deformation is apparent subse-
only), quently and no other weakness is detected which
4 Regulation test, may prevent the machine from operating normally
and provided the rotor windings after the test comply
4 Measurement of open circuit characteristic with the required dielectric tests. The duration of any
only, overspeed test shall be two minutes.
NOTE - The exciter field current and voltage shall be mea-
sured for bmsldess alternator.
23.3 Due to settling in laminated rotor rims, lami-
nated poles held by wedges or by bolts, etc, a minute
e) Measurement of short-circuit characteristic permanent increase in the diameter is natural and
only, not to be considered as an abnormal deformation
NOTE - The exciter field current and voltage shall be measured indicating that the machine is not suitable for normal
for brushless alternator. operation.

f) Efficiency test, 24 UNBALANCED LOAD

g) Temperature rise test, Unless otherwise specified three-phase synchro-
h) Overspeed test, nous generators of ratings up to 1 250 kVA shall be
capable of continuously operating on an unbalanced
j) Insulation resistance test (bothbefore and after load (as defined in 3.6.4) of 25 percent with none of
high voltage test), the phase currents exceeding the rated current. The
temperature rise limits specified in IS 4722 : 1992 may
k) High voltage test, exceed by 10°C when generator operation under such
m) Determination of deviation of voltage wave- conditions. The voltage regulation under the above
form from sinusoidal (subject to agreement condition will not apply.
between the manufacturer and the user),
25 SHORT-CIRCUIT CURRENT
4 Momentary overload test (see 12.1), and
Unless otherwise specified, the peak value of the short-
P) Test for vibration severity (see 13) circuit current for synchronous machines, in the case of
(under consideration).
short circuit on all phases during operation at rated
20.33 Routine Tests voltage, shall not exceed 15 times the peak value or 21
times the rms value of the rated current. ‘Ihe check may
The following shall constitute the routine tests: be carried out by calculation or by means of a test at a
voltage of 50 percent of the rated voltage or above.
Measurement of resistance,
NOTE - The short-circuit current value can be more for
Insulation resistance test, alternators supplying non-linear loads ( see 8.2 ).

Phase sequence test (for 3-phase generators

only), 26 INSTANTANEOUS SHORT-CIRCUIT
WITHSTAND TEST FOR AC GENERATORS
Regulation test;
26.1 ‘Ihe short-circuit test for AC generators shall be
Measurement of open circuit characteristic, carried out only at the express request of the purchaser
Measurement of short-circuit characteristic, made at the time of the order. In this case, the test shall
and be carried out on the machine running on no load with
an excitation corresponding to the rated foltage unless
High voltage test. otherwise agreed. In no case shall the test be carried out

7
IS 13364(part 2) : 1992
with an excitation greater than that corresponding to IS 3003 Specifications for carbon brushes
1.05 times the rated voltage. (parts 14% 2) for electric machines

26.1.1 This voltage may be reduced by agreement IS 3043 : 1987 Code of practice for earthing (first
between the manufacturer and the purchaser in revision )
order to take into account the impedance of the trans-
former which may be placed between the generators IS 4691 : 1985 Degree of protection provided by
and the system. In the latter case, it may be requested enclosures for rotating electrical
that the test be made on the site with the over excitation machinery (first revision )
device in service. The short circuit shall be maintained
for 3 seconds. IS 4722 : 1992 Rotating electrical machines
26.2 The test is considered satisfactory if no harmful
deformation occurs and if the requirements of the high IS 4728 : 1975 Terminal marking and direction of
voltage test are met after the short-circuit test. rotation for rotating electrical
machinery (first revision)
27 RADIO INTERFERENCE SUPPRESSION IS 4889 : 1968 Method of determination of
efficiency of rotating electrical
If required by the user, suitable radio interference machines
suppression means shall be fitted on the alternators.
Acceptance limit is subject to agreement between the IS 7132 : 1973 Guide for testing synchronous
manufacturer and the purchaser. machines
IS 7306 : 1974 Methods of determining
28 PARALLEL OPERATION synchronous machine quantities
from tests
If desired by the purchaser, the manufacturer shall
provide means to ensure stable parallel operationofthe IS 12360: 1988 Voltage bands for electrical
generator with other generating sets or with another installations including preferred
source of supply, also ensuring correct sharing of the voltages and frequency
reactive power. (superseding IS 585)

29 OTHER APPLICABLE INDIAN 30 MOUNTING DIMENSIONS

STANDARDS
Fixing dimensions of generators shall be as per
IS 900 : 1965 Code of practice for installation
IS 1231 : 1974. Fixing dimensions of other than B3
and maintenance of induction
mounting(likeB20,B5,singlebearingmachines)shall
motors (revised)
be as agreed to between the manufacturer and the
IS 1076 : 1957 Preferred numbers supplier.

c
1

8
 IS 13364 (Part 2) : 1992

ANNEX A
(CZuz.4se
2)

LIST OF REFERRED INDIAN STANDARDS

IS No. Title IS No. Tide

1231: 1974 Dimensions of three-phase foot- 6362 : 1971 Designationof methods of cooling
mounted induction motors (third for rotating electrical machines
revision )
7132: 1973 Guide for testing synchronous
3043 : 1987 Code of practice for earthing yirst machines
revision )
7306 : 1974 Methods of determining
4691: 1985 Degrees of protection provided by
synchronous machine quantities
enclosures for rotating electrical from tests
machinery (first revision ) 10242 (Part 3/ Electrical installations in ships:
4722 : 1992 Rotating electrical machines Set 1) : 1983 Part 3 Equipment, Section 1
Generators and motors
4728 : 1975 Terminal marking and direction
of rotation for rotating electrical 12075 : 1987 Mechanical vibration of rotating
machinery (first revisbn ) electrical machines with shaft
heights 56 mm and higher-
4889 : 1968 Methods of determination of measurement, evaluation and
efficiency of rotating electrical limits of vibration severity
machines
12802 : 1989 Temperature-rise measurements
5422 : 1969 Turbine type generators of rotating electrical machines

ANNEX B
(Clause 19.1)

INFORMATION WITH ENQUIRY AND ORDER FOR AC GENERATOR

El WhenenquiringfororderinganACgenerator,the 13) Conditions to be met in case of parallel opera-

following particulars should be supplied: tion;

1) Frequency in Hz; 14) Whether the neutral point is to be brought out

to a terminal to deal with current in the neutral
2) Numberofphases,andinthecaseofpolyphase line in normal service, and if so, the amount of
machines, the inter-connection between the current in amperes to be carried;
phases, if any;
15 Site and operating conditions;
3) Electrical output in kVA,
16) The type of enclosure;
4) Rated voltage;
17) The type of duty;
5) Power factor, if other than 0.8;
18) The maximum temperature of the cooling air,
6) Current in amperes; if it exceeds 4tYC or of the cooling water, if it
7) Voltage regulation grade; exceeds 30°C in the place in which the genera-
tor is intended to work in ordinary service.
8) Speed in revolutions per minute at no load and
at rated load; 19) The altitude of the place in which the machine
is intended to work in ordinary service if it
Direction of rotation; exceeds 1000 m;
Whether the generator is to have its own 20) If a generator is required to operate between
exciter, and if so, the method of drive or various limits of voltage, current, frequency or
whether the excitation is to be obtained from a speed, thecorrespondingvaluesofthe voltage,
separate source; current, frequency and speed respectively
Excitation voltage, if the generator is not to be 21) System of earthing, if any, to be adopted;
provided with its own exciter;
22) Application details or load details, for ex-
Prime movers; ample, motors, rectifiers, thyristor loads, etc;

9
IS 13364(Part 2) : 1992

3) Maximum load switched on or off and voltave 26) Thermistors or resistance thermometers;
drop and rise permitted;
27) Particulars oftests required and where they are
to be carried out; and
24) Space heaters;
Special conditions.
25) Bearing thermometers; 3

10
 1

Standard Mark

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Standards Act, 1986 and the Rules and Regulations made thereunder. The Standard Mark on
products covered by an Indian Standard conveys the assurance that they have been produced
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ducer. Standard marked products are also continuously checked by BIS for conformity to
that standard as a further safeguard. Details of conditions under which a licence for the use
of the Standard Mark may be granted to manufacturers or producers may be obtained from
the Bureau of Indian Standards.
Bureau of Indian Standards

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harmonious development of the activities of standardization, marking and quality certification of goods
and attending to connected matters in the country.

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Revision of Indian Standards

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issued from time to time. Users of Indian Standards should ascertain that they are in possession of
the latest amendments or edition. Comments on this Indian Standard may be sent to BIS giving the
following reference :

Doc:No.ET IS(3290)

Amendments Issued Since Publication

-~
Amend No. Date of Issue Text Affected

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