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है”ह”ह

IS 5553-5 (1989): Reactors, Part 5: Tuning reactors [ETD16: Transformers]

lndian Standard

REACTORS- SPECIFICATION PART 5 TUNING REACTORS

( First Revision ) First Reprint MARCH I996

UDC 621’316’935

Q BIS 1990

BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

Jum 1990 Price GrolQ 2

Transformers Sectional Committee, ETD 16

This Indian Standard ( Part 5 ) (First Revision) was adopted by the Bureau of Indian Standards on 22 December 1989. after the draft finalized by the TransformersSectional Committee had been approved by the Electrotechnical Division Council.

This standard was first published in 1970. This revision has been undertaken with a view to bring it in line with the revision of IEC Pub 289 ( 1988 ) ‘Reactors’.

In this revision the requirements for reactors have been covered in eight parts as follows:

Part 1

Part 2

Part 3 Part 4 Part 5 Part 6 Part 7

Part 8

General Shunt reactors Current limiting and neutral earthing reactors Damping reactors Tuning reactors Earthing transformers ( Neutral couplers ) Arc suppression reactors

Smoothing reactors

This standard ( Part 5) has been based on IEC Publication 289 ( 1988 ) Reactors Section Five Tuning Reactors, issued by the International Electrotechnical Commission.

This part shall be read in conjunction with Part 1 of the standard. A list of referred standards is also given in Part 1 of this standard.

Indian

REACTORS -

IS 5553 ( Prrrt 5 ) : 1989

Standard

SPECIFICATION PART 5 TUNING REACTORS

( First Revision )

1 SCOPE

1.1 This standard ( Part 5 ) covers tuning reactors. These are reactors in ac systems which are con- nected with capacitors to tuned filter circuits with responances in the audio frequency range for reducing, blocking or filtering harmonics or communication frequencies. The tuning reactors are connected eitheir in a parallel configuration in the system (with system voltage applied across them) or in a series configuration (with load current flowing through them ).

1.1.1 Design

Tuning reactors are single-phase or three-phase reactors, oil-immersed or dry type. The reactqrs may be designed with means for adjusting the inductance value within a limited range by tappings or by movement of core and/or coils. This is subject to agreement and should be rmentioned in the enquiry or tender.

Tuning reactors for audio frequency signals may be equipped with a~second winding connected to the audio frequency source or to other com- ponents.

When connected in parallel configuration they are subjected to inrush transients at switching opera- tions. When connected in series configuration they are also subjected to overcurrents due to system faults which they will have to withstand under recognized conditions.

NOTES

1 If three-phase filter circuits are insta!led, attention should he paid to the magnetic coupling between different reactor phases.

2 For non-shielded tuning reactors, due considera- tion should be given to possible influence by the mounting stwXure.

2 DEFINITIONS

2.0 For the purpose of this standard the follow- ing definitions shall apply.

2.1 Rated Power-Frequency Current ( IN )

The rms value of continuous power frequency current flowing through the reactor.

2.2 Rated Power-Frequency Voltage ( UN )

The rms value of continuous power frequency voltage applied across the reactor.

2.3 Rated Tuning-Frequency Current ( IA )

The rms value of the continuous current of tuning frequency flowing through the reactor.

NOTE - In certain applications ( aud:o frequency signaIling ) the tuning frequency currentis intermittent. This shall be taken into account for considerations of loss and temperature rise.

2.4 Rated Tuning-Frequency Voltage ( VA )

The rms value of the continuous voltage of tuning frequency applied across the reactor.

2.5 Rated Tuning Frequency (fi )

The responance frequency of the filter circuit to which the reactor shall be connected.

2.6 Rated Inductance ( LA )

The inductance value at rated tuning frequency.

2.7 Rated Q-Factor ( QA )

The ratio between reactance and resistance at tuning frequency and reference temperature.

2.8 Rated Short-Time Current ( IKN )

The rms value of short-time overcurrent and its

% uration ( if applicable ) that is recognized for

t e tuning reactor.

3 RATING

3.1 Rating Current or Voltage Quantities

Depending on whether the tuning reactor is intended tb be connected in a series or a parallel configuration it shall have rated values of power- frequency and tuning-frequency current or voltage, as applicable.

The values of these rated quantities shall be sClected at least equal to the expected. values in normal operation of the filter circuits in the system.

3.2 Rated Short-Tikne Current

For a parallel-connected -tuning reactor these quantities shall be related to inrush phdnomena and determined according to 4 of Part 4 of this standard.

1

IS 5553 ( Part 5 ) : 1989

For a series-connected tuning reactor, this quantity is related to system overcurrent faults ( 2.2 and 5.3 of Part 3 of this standard).

The magnitude and duration of the overcurrent should be specified in the enquiry and tender for tuning reactors in individual applications.

For standardized reactors at lower voltage in the absence of other specifications the overcurrent is assumed to be limited to 25 times the rated power- frequency continuous current, with a duration of not more than 2 seconds.

3.3 Rated Q-Factor

Unless -otherwise specified this is guaranteed minimum value.

3.4 Current or Voltage Spectruih

The spectrum of harmonic or nonharmonic frequency current or voltage components in service shall be stated in the enquiry.

3.5 Insulation Level

Unless otherwise specified the insulation level shall correspond to the highest voltage for equip- ment U of the system in which the reactor is to be installed. If one terminal of the reactor is intended to be directly earthed, non-uniform in insulation -may be applied by agreement.

NOTE -When a second winding is added in an audio signalling reactor, this winding should be designed with consideration of possible transferred overvoltages from the power system.

4 RATING PLATES

4.1 Each reactor shall be provided with a rating plate of weatherproof material fitted in a visible position, showing the appropriate items indicated below. The entries on the plate shall marked ( for example, by etching, stamping ).

be indelibly engraving or

a) Type of reactor; b) Number of this specification; c) Indication of the source of manufacture

d) Manufacturer’s serial number;

e) Year of manufacture;

0 l3)

h)

3

-1)

Insulation level;

Rated power frequency voltage ( as applicable );

Rated tuning frequency voltage ( as applic- able ); Rated power frequency current (was applicable ); Rated tuning freautncy current (as applicable ); -

and duration; m) Rated short-time current

n) Rated power frequency; o) Rated tuning frequency;

P) Rated inductance;

q) Rated Q-Factor;

r) Environment ( outdoor, indoor ); and

s) Total mass.

5 TESTS

5.1 General requirement for type, routine and special tests, provisions of 16.1 of IS 2026 ( Part 1 ) : 1977 shall apply

5.2 Type Tests

The following shall constitute type tests:

a) Measurement of winding resistauce [see 16.2 of IS 2026 ( Part 1 > : 1977 1;

-b) Measurement of insulation resistance [ see 16.6 of IS 2026 ( Part 1 ) : 19771;

4 4

d

f) d h) 3

Measurement of inductance (see 5.3 ); Induced overvoltage withstand test (see 5.4);

Separate-source vo!tage withstand test [ see 10 of 1s 2026 ( Part 2 ) : 1981 1; Measurement of Q-factor ( Jee 5.5); Measurement of loss ( see 5.6 );

Temperature-rise test (see 5.7); and

Lightning impulse test [ see 12 of IS 2026 (Part 3) : 1981 I.

5.3 Routine Tests

The following shall constitute routine tests:

4

I-9

‘4 4

4

0 g)

Measurement of winding resistance [see 16.2 of IS 2026 ( Part 2) : 19811;

Measurement of insulation resistance [ see 16.6 of IS 2026 ( Part 1) : 1977 I;

Measurement of inductance (see 5.3 );

Induced withstand test ( see 5.4 );

overvoltage

Separate-source voltage withstand test [ see 10 of IS 2026 ( Part 2 ) : 198 1 1; Measurement of Q-factor (see 5.5 ); and

Measurement of loss ( see 5.6).

5.4 Measurement of Inductance

The measurement of inductance of a tuning reactor shall be made at tuning frequency and at approxi- mately rated tuning frequency current or voltage as appropriate with the following exceptions.

The inductance of a reactor without magnetic core is assumed to be constant regardless of current and may be measured at reduced current ( or voltage ).

If the linearity of a core type reactor up to a current equal to rated tuning-frequency current is demonstrated at power frequency the inductance at tuning frequency may be measured at reduced current or voltage, as appropriate.

2

5.5 Induced Overvoltage Withstand Test

The test shall be made in general accordance with IS 2026 (Part 3) : 1981, 11.1. The test voltage shall be two times the voltage across the reactor when IKN passes through it or two times ( UN f I/A ), whichever IS higher.

If the power and voltage requirements for this test exceed those available at the test station, the test shall be replaced, by agreement between the purchaser and the manufacturer, by a lightning impulse test in accordance with 12 of IS 2026 (Part 3 ) : 1981.

5.6 Measurement of Q-Factor

The measurement is made at tuning frequency. The measured Q-factor, obtained at or corrected to reference temperature shall be not less than the guaranted value. The procedure for temperature correction, if applied, shall be stated and be generally in line with 6.7.

5.7 Measurement of Loss

The total loss of a tuning reactor is composed of the iron loss ( if the reactor has a core or magnetic shield) and of winding losses from current

IS 5553 ( Part 5 ) : 1989

components of system frequency, possible har- monics and/or a superimposed non-harmonic frequency ( signalling frequency ).

The iron loss and power frequency winding loss are determined by a measurement at power frequency. Losses from higher individual frequ- ency components as specified are calculated or measured at the respective frequencies and added to the power frequency loss. The total loss is referred to reference temperature and shall not exceed the guaranteed value.

5.8 Determination of Temperature Rise

The temperature-rise test is made wit11 power frequency. The test current or voltage shall be adjusted to correspond to the total loss according to 5.6.

The test procedure shall be in general accordance with IS 2026 (Part 2) : 1977 or IS 11171 : 1985.

6 TOLERANCE ON INDUCTANCE

6.1 If a tuning reactor is not provided with means of adjusting the inductance, a tolerance on the inductance shall be specified and guaranteed.

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Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed periodically; a standard along with amendments is reaffirmed when such review indicates that no changes-are needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards should ascertain that they are in possession of thelatest amendments or edition by referring to the latest issue of ‘BIS Handbook* and ‘Standards Monthly Additions*.

This Indian Standard has been developed from Dot : No. ET’D 16 ( 2778 )

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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