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है”ह”ह

IS 5553-4 (1989): Reactors, Part 4: Damping reactors [ETD16: Transformers]

IS 5553 ( Part 4 ) t 1983

Indian Standard

REACTORS - SPECIFICATION PART 4 DAMPING REACTORS

( First Revision ) First Reprint MARCH 1996

UDC 621’316’935

@I BIS 1990

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

NEW DELHI 110002

Se+vnbcr 1990 Price Group 1

Transformers Sectional Committee, ETD 16

FOREWORD

This Indian Standard ( Part 4 ) ( First Revision ) was adopted by the Bureau of Indian Standards on 22 December 1989, after the draft finalized by the Transformers Sectional 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 IEC Pub 289 ( 1988) ‘Reactors’.

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

Part 1 General

Part 2 Shunt reactors

Part 3 Current limiting and neutral earthing reactors

Part 4 Damping reactors

Part 5 Tuning reactors

Part 6 Earthing transformers ( Neutral couplers )

Part 7 Arc suppression reactors

Part 8 Smoothing reactors

This standard has been -based on IEC Pub 289 ( 1988) : ‘Reactors Section Four Damping reactors’, issued by the International Electrotechnical Commission.

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

Indian Standard

REACTORS-SPECIFICATION PART 4 DAMPING REACTORS

( First Revision )

1 SCOPE

1.1 This standard ( Part 4 ) covers damping reactors which are used particularly for limiting the inrush currents occuring during the switch- ing of capacitor banks to ac networks. They are connected in series with the capacitors.

During normal operation the capacitor rated current flows through the damping reactors. The maximum permissible ( overload ) current of the damping reactor is equal to the corres- ponding value of the capacitor bank as called for in the relevant standards for power ( shunt ) capacitors.

NOTE - For special capacitor applications, such as in static var sources or HVDC systems the currents as specified in the power capacitor standards are not always applicable.

1.1.1 Damping reactors are usually single or three-phase, dry type natural (self) cooled, tvithoht iron core, for indoor or outdoor installation.

2 TERMINOLOGY

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

2.1 Rated Continuous Current ( IN )

The rms value of the current flowing through the damping reactor.

2.2 Rated Inrush Current (lin )

The rated inrush current is the peak value of the highest inrush current specified for the damping reactor.

2.3 Rated Inductance ( LN )

The inductance value at system frequency specified ~for damping reactor.

2.4 Q-Factor

The ratio of reactance to resistance for the damping reactor at specified frequency and temperature.

3 RATING

3.1 Rated Continuous Current

The rated continuous current of the damping

reactor shall be selected at least equal to the maximum permissible current of the associated capacitor battery or battery section.

NOTE - The maximum permissible current according to IS 2834 : 1981 power capacitor is a current with the rms value equal to 1’3 times the value obtained at rated sinusoidal voltage across the capacitor.

4 INRUSH CURRENT

4.1 The Rated Inrush Current-The rated inrush current shall be selected to cover all recognized cases of switching the capacitor battery or battery sections. The relevant inrush resonant frequency shall be specified in the inquiry. The manufacturer shall on request supply information about the expected Q-factor of the damping reactor at this frequency. The damping reactor shall be capable of with- standing the dynamic effects of this rated inrush current. :

NOTES

1 The thermal effect of the inrush current is normally without significance.

2 If-the damping reactor is required to withstand over- current in excess of the rated inrush current, for example, due to capacitor faults the ~magnitude and duration of such overcurrent shall be specified.

5 INSULATION LEVEL

5.1 Unless otherwise specified the insulation level shall correspond to the highest voltage for equipment Urn of the system in which the damping reactor is to be installed. If one terminal of the damping reactor is intended to be directly earthed, non-uniform insuIation may be applied by agreement between the manufacturer and the purchaser.

6 TEMPERATURE RISE

6.1 For damping reactors the temperature-rise limits given in 3 of IS 2026 ( Part 2 ) : 1977, shall be applicable.

7 RATING PLATES

7.1 Each reactor shall be provided with a rating plate of weatherproof material, fitted in a visible position, showing the items as follows:

appropriate

The entries on the plate shall be indelibly marked ( for -example, by etching, engraving or stamping).

1

IS 5553 (Part 4) : 1999

7.1.1 The following information is to be given on the plate in all cases.

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,

f) Insulation level,

g) Rated frequency,

h) Rated inductance,

j) Rated -continuous current,

k) Temperature rise,

m) Rated inrush current,

n) *factor at a specified frequency, and

p) Total mass.

8 TESTS

8.0 General requirements for routine, type and special tests, provisions given in 16.1 of IS 2026 ( Part 1) : 1977 shall apply.

8.1 Type Tests

The following shall constitute type tests:

4

b)

4 4

4

f)

d

The test voltage shall be twice the voltage occurring at rated inrush current.

Measurements of winding resistance 8.6 Separate-Source Voltage Withstand [ see 16.2 of IS 2026 ( Part 1 > : 1977 I, Test

Measurement of insulation resistance The test is to be made at system frequency in accordance with 8.10 of Part 3 of this standard.

1. see 16.6 of IS 2026 ( Part 1) : 1977 1,

Measurement of inductance ( see 8.4 ),

Separate-source voltage withstand ( see 8.6 of Part 3 of this standard ),

Inter-turn overvoltage withstand ( see 8.5 ),

test

test

Temperature rise test ( SCG 8.8 of Part 3 of this standard ), and

Lightning impulse test ( see 8.9 of Part 3 of _ _ _ _.

8.2 Routine Tests

The following shall constitute the routine test:

4

b)

4 4

4

Measurement of winding resistance [see 8.6 of IS 2026 (Part 1) : 1977 J,

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

Measurement of inductance ( see 8.4 ),

Separate-source voltage withstand test ( see 8.6 of Part 3 of this standard ), and

Inter-turn cover voltage withstand test ( see 8.5 ).

8.3 Special Tests

The following shall constitute the special tests:

a) Inrush current withstand test ( see 8.6 ), and

b) Q-factor measurement ( see 8.7 ).

8.4 The measurement may be made at any current value suitable, or by a bridge method. The rated inductance value is referred to system frequency.

8.5 hrterturn Voltage Withstand Test

This test shall be performed in general accor- dance with 8.7 of Part 3 of this standard, with following exception:

8.7 Q-factor Measurement

The measurement is made by the bridge method at the specified inrush resonant frequ- ency ( see 5.5 of Part 5 so far as applicable ).

9 TOLERANCE

9.1 The tolerance shall be as follows: + 20% _ o 0L ofrated inductance. ” ,” this standard 1.

2

Bureau of Indian Standards

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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 the latest 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. ETD 16 ( 2777 )

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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