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IS 1885-42 (1993): Electrotechnical Vocabulary, Part 42:Power capacitors [ETD 1: Basic Electrotechnical Standards]

IS 1885 ( Part 42 ) : 1993 EC Pub 60 (436 ) ( 1990 )

wem wF5

Indian Standurd

ELECTROTECHNICALVOCABULARY PART 42 POWER CAPACITORS

( First Revision )

UDC 621-319-4 : 001*4

Q BIS 1993

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

NEW DELHJ 110002

May 1993 I Price Group 2

Basic Electrotechnical Standards Sectional Committee, ET 01

NATIONAL FOREWORD

This Indian Standard ( Part 42 ) ( First Revision ) which is identical with IEC Pub 50 ( 436 ) ( 1990 ) %ternational electrotechnical vocabulary - Chapter 436 : Power capacitors’, issued by the Inter- national Electrotechnical Commission ( IEC ), was adopted by the Bureau of Indian Standards on the recommendation of the Basic Electrotechnical Standards Sectional Committee and approval of the Electrotechnical Division Council.

This Tndian Standard ( Part 42 ) was ftrst published in 1985. The first revision has been undertaken to align with the international practice.

Only the English text given in the IEC publication has been retained while adopting as Indian Standard, and as such the page numbers given here are not same as in IEC publication.

IS 1885 ( Fart 42 ) : 1993 IEC Pub 50 (436) (1990)

Indian Standard

ELECTROTECHNICAL VOCABULARY PART 42 POWER CAPACITORS

SECTION 436.Ol- GENERAL TERMS

436-01-01 436-01-10

capacitance of a capacitor (jxoperty)

The ability of a capacitor to store an electrical charge.

436-01-02

capacitance of a capacitor (quantity)

The electrical charge on one of the capacitor electrodes divided by the potential difference between them, the influence of any other conductor being negligible.

436-01-03

discharging of a capacitor

The release of all or part of the energy stored in a capacitor.

436-01-11

discharging current of a capacitor

The current which flows during the discharging of a capacitor.

436-01-12

(capacitor) element

A device consisting essentially of two electrodes separated by a dielectric.

436-01-04

(capacitor) unit

rated capacitance of a capacitor

The capacitance value derived from the values of rated output, voltage and frequency of the capacitor.

436-01-13

An assembly of one or more capacitor elements in the same container with terminals brought out.

436-01-05

rated current of a capacitor

The r.m.s. value of the alternating current for which the capacitor has been designed.

436-01-14

(capacitor) stack

An assembly of capacitor units connected in series.

436-01-06

rated frequency of a capacitor

The frequency for which the capacitor has been designed.

(capacitor) bank

A number of capacitor units connected so as to act together.

436-01-07

436-01-15

capacitor installation

One or more capacifor banks and their accessories.

436-01-08

rated voltage of a capacitor

The r.m.s. value of the alternating voltage for which the capacitor has been designed,

436-01-16

charging of a capacitor

The storage of energy in a capacitor.

436-01-09

rated output of a capacitor

The reactive power for which the capacitor has been designed.

436-01-17

charging current of a capacitor

The current which flows during the chatging of a capacitor.

rated temperature category of a capacitor

The range of temperature of the ambient air or of the cooling medium for which the capacitor has been designed.

SECTION 436-02 - FUNCTIONS

436-02-01 power capacitor

A capacitor intended for use in a power network.

436-02-02

shunt capacitor

A power capacitor intended to be connected in parallel with a network.

Note. --These capacitors are used primarily for the compen- sation of all or part of the reactance of the line.

Note. - These capacitors are used primarily used for power. factor correction by reactive power compensation.

436-02-03 series capacitor

A power capacitor intended to be connected in series with a line.

1

IS 1885 (Part 42) :.1993 IEC Pub 50 (436) (1990)

436-02-04

motor starting capacitor

A power capacitor that causes a phase shift in an auxiliary winding of a motor and which is switched out of a circuit once the motor is running.

436-02-05

motor running capacitor

A power capacitor which, when used in conjunction with an auxiliary winding of a motor, assists the motor to start and improves the torque under running condi- tions.

436-02-06

filter capacitor

A power capacitor intended to form part of a circuit designed to reduce one or more harmonic currents present in a network.

436-02-07

power electronic capacitor

A power capacitor intended to be used in power electronic equipment and capable of operating con- tinuously under non-sinusoidal conditions.

436-02-08

energy storage capacitor

A power capacitor intended to store energy and to release it within a very short time.

436-02-09

circuit-breaker capacitors

Capacitors connected in parallel with interrupting units of a pole of a circuit-breaker, intended to ensure a suitable voltage distribution across them.

436-02-10

capacitor voltage divider

A capacitor stack forming an alternating voltage divider.

436-02-11

coupling capacitor

A capacitor used for the trammission of signals in a power system.

436-02-12

high-voltage capacitor (of a capacitor divider)

The capacitor connected between the high-voltage ter- minal and the intermediate voltage terminal of a capacitor divider.

436-02-l 3

intermediate voltage capacitor (of a capacitor divider)

The capacitor connected between the intermediate voltage terminal and the low-voltage terminal of a capacitor divider.

SECTION 436-03 -TECHNOLOGY

436-03-01 (421-02-01)

line terminal

A terminal intended for connection to a line conductor of a network.

436-03-02

earth terminal

A terminal intended for connection to earth.

436-03-03

intermediate voltage terminal (of a capacitor divider)

A terminal intended for connection to an intermediate circuit such as the electromagnetic unit of a capacitor voltage transformer.

436-03-04

low-voltage terminal (of a capacitor divider)

A terminal intended for connection to earth either directly or via an impedance of negligible value at network frequency.

Note. -In a coupling capacitor, this terminal is connected to the signal transmitting device.

436-03-05

electrolytic capacitor

Acapacitor in which the dielectric consists of an anodi- tally formed oxide film on one or both electrodes.

436-03-06

a.c. electrolytic capacitor

An electrolytic capacitor specially designed for a.c. operation.

436-03-07

paper capacitor

Acapacitor with a dielectric consisting ofpaperusually impregnated.

436-03-08

film capacitor

A capacitor with a dielectric consisting of polymeric film usually impregnated.

436-03-09

mixed dielectric capacitor

A capacitor of which the dielectric consists of at least two different solid substances usually impregnated.

436-03-10

metal foil capacitor

A capacitor ofwhich the electodcs consist of metal foils.

436-03-H

metallized capacitor

Acapacitor of which the electrodes consist of a metallic deposit on the dieleclic.

2

436-03-12

self-healing capacitor

A capacitor of which the electrical properties, after local breakdown of the dielectric, are rapidly and es- sentially restored.

436-03-13 (212-03-01)

impregnating

The process of tilling with a liquid the interstices and voids in an insulating material or a combination of materials.

Note. -The liquid may remain liquid or become solid after impregnating,

436-03-14 overvoltage protector of a capacitor

Afast-acting device intended to limit the voltage across the capacitor terminals to a permissible value.

436-03-15

discharge device of a capacitor

A device which may be incorporated in a capacitor, intended to reduce the voltage between the terminals to

IS 1885 ( Part 42 ) : 1993 IEC Pub 50 (436) (1990)

a given value, within a given time, after the capacitor has been disconnected from a network.

436-03-16

internal fuse of a capacitor

A fuse connected inside a capacitor unit, in series with an element or a group of elements.

436-03-17

overpmssure disconnector for a capacitor

A disconnecting device designed to interrupt the cur- rent path in the event of abnormal increase of the internal pressure.

436-03-M

capacitor bank protection

Ageneral term for protective equipment for a capacitor bank.

436-03-19

unbalance protection for a capacitor bank

A protection system employing device(s) sensitive to the current or v&age difference between parts of a bank.

SECTION 436-04 - OPERATIONAL CHARACTERISTICS

436-04-01

capacitance tolerance (of a capacitor)

The permissible difference between the actual capacitance and the rated capacitance under specified conditions.

436-04-02

equivalent series resistance (of a capacitor)

A virtual resistance which, if connected in series with an ideal capacitor of capacitance value equal to that of the capacitor in question, would have a power loss equal to the active power dissipated in that capacitor under specified operating conditions.

436-04-03

high frequency capacitance (of a capacitor)

The effective capacitance at a given frequency result- ing from the joint effect ofthe intrinsic capacitance and the self-inductance of t.he capacitor.

436-04-04

open-circuit intermediate voltage (of a capacitor divider)

The voltage across the terminals of the intermeditite voltage capacitor when a voltage is applied between the high-voltage and low-voltage terminals, no impedance being connected in parallel with the intermediate volt- age capacitor.

436-04-05

(voltage) ratio of a capacitor,divider

The ratio of the voltage applied to the capacitor divider to the open circuit intermediate voltage.

Note. -This ratio corresponds to the sum of tbe capacitances of the high-voltage and intermediate voltage capacitors divided by the capacitance of the high-voltage capacitor.

436-04-06

limiting voltage of a capacitor

The maximum peak voltage which can be applied periodically or occasionally to the terminals of the capacitor.

436-04-07

maximum permissible a.c. voltage of a capacitor

The maximum r.m.s. alternating voltage which the capacitor can sustain for a given time in specified condition?.

436-04-08.

limiting current of a capacitor

The maximum peak current which can be carried peri- odically or occasionally by the capacitor.

436-04-09

maximum permissible a.c. current of a capacitor

The maximum r.m.s. altematingcurrentwhich the capacitor can sustain for a given time in specified conditions.

436-04-10

capacitor losses

The active power dissipated in the capacitor.

436-04-H

tangent of the loss angle (of a capacitor)

tan 6 (Delta) (abbreviation)

The ratio between the equivalent series resistance and the capacitive reactanced of the capacitor at specified sinusoidal alternating voltage and frequency.

3

IS 1885 ( Part 42 ) : 1993 IEC Pub 50 (436) (1990)

INDEX A

xc. electrolytic capacilor

B

bank

436-03-(X,

limiting voltage of a capacitor

line terminal

436-01-06

low voltage terminal (of a capacitor divider)

M

436-04-06

436-03-01

436-03-04

C maximum permissible a.c. current of a capacitor

436-04-09

capacitance of a capacitor (property) 436-01-01 capacitance of a capacitor (quantity) 436-01-02 capacitance tolerance (of a capacitor) ,36-04-01 capacitor bank 436-O! -06 capacitor bank protection 436-03-18 capncitor element 436-01-03 capacilor installaiion 436-01-07 capacitor losses 436-04-10 capacitor stack 436-01-05 capacitor unit 436-01-04 capacitor voltage divider 436-02- 10 charging current of a capacitor 436-01-09 charging of a capacitor 436-01-08 circuit-breaker capacitors 436-02-09 coupling capacitor 436-02-l 1

maximum permissible B.C. voltage of a capacitor

436-04-07

metal foil capacitor

metallized capacitor

mixed dielectric capacitor

motor running capacitor

motor starting capaciior

0

436-03-10

436-03-11

436-03-09

436-02-05

436-02-04

open-circuit intermediate voltage (of a capacitor divider)

overpressure disconnector for a capacitor

overvoltage protector of a capacitor

r

436-04-04

436-03-17

436-03-14

n

discharge device of a capaci!or discharging of a capacitor

discharging current of a capacitor

E

436-03-15 436-01-10

436-01-11

paper capacitor

power capacilor

power electronic capacitor

K

436-03-07

436-02-01

436-02-07

earth terminal

electrolytic capacitor

element

energy storage capacitor

equivalent series resistance (of a capacitor)

436-03-02

436-03-05

436-01-03

436-02-08

436-04-02

rated capacitance of a capacitor 436-01-12 rated current of a capacitor 436-01-13 rated frequency of a capacitor 436-01-14 rated output of a capacitor 436-01-16 rated temperature category of a capticitor 436-01-17 rated voltage of a capacitor 436-01-B ratio of a capacitor divider 436-04-05

F

film capacitor 436-03-08 filter capacitor 436-02-O6

S

H

high frequency capacitance (of a capacitor) 436-04-03 high voltage capacitor (of a capacitor divider) 436-02- 12

self-healing capacitor

series capacitor shunt capacitor

stack

436-01-0.5

436-03-12 436-O2-03

436-02-02

impregnating

I T

intermediate voltage capacitor (of a capacitor divider)

436-04-I 1

436-04-l 1

intermediate voltage terminal (of a capacitor divider)

436-03-13

436-02-13

436-03-03

Tan 6 (of a capacitor)

tangent of the loss angle [of a capacitor)

IT

internal fuse of a capacitor ’

1;

436-03-16 unbalance protection for a capacitor bank

unit

V

436-03-19

436-01-04

limiting current of a capacitor 436-04-08 voltage ratio of a capacitor divider 436-04-05

4

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