Siemens 3AH Manuale di istruzioni - Pagina 35

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1. Table of Contents

Appendix

Table A-1 a

Type 3AH Circuit Breaker Ratings (Historic "Constant MVA" Rating Basis)

These ratings are in accordance with the following standards:

ANSI C37.04-1979

Standard Rating Structure for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis

ANSI C37.06-1987

AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis- Preferred Ratings and Related Required Capabilities

ANSI C37.09-1979

Standard Test Procedure for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis

ANSI C37.010-1979

Application Guide for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis

Measured Parameter

Nominal Voltage Class

General

Nominal 3-Phase MVA Class

Maximum Design Voltage ( V )

Rated

Voltage

Voltage Range Factor ( K ) "'

Insulation

Withstan d

Levels

Voltage Levels

Rated

Values

Continuous "'

Short-Circuit (at rated maximumdesign

Rated

Current

voltage) (

I nterrupting Time

Permissible Tripping Delay

Rated Maximum Design Voltage (V)divided

by K ( � V/K )

Current

Max. Sym I nterrupting ( K x I )

Required

Short-Ti me Current ( K x I ) (3 seconds)

Capabili-

ties

Asymmetrical ( 1.6 x K x I ) '"

Closing

and

Latching

Peak ( 2.7 x K x I ) "'

(Momentary)

Footnotes

1. High close and latch ( m o mentary) rating available for special application

2. Maxi m u m voltage for which the circuit breaker is designed, and the upper l i m it for operation.

3. K is the ratio of the rated maxi m u m design voltage to the lower limit of the range of operating voltage in which the required symmetrical

and asym metrical interrupting ca pabilities vary in inverse proportion to the operating voltage.

4.To obtain the required symmetrical interrupting capability of a circuit breaker at an operating voltage between 1 /K times rated

maxi m u m design voltage and rated maxi m u m design voltage, the following formula shall be used: Required Sym metrical Interrupting

Ca pability = Rated S hort-Circuit Cu rrent ( I ) X [ ( Rated Maxi m u m Design Voltage ) I ( Operating Voltage ) 1

For operating voltages be low 1/K times rated maxim u m design voltage, the req u i red symmetrical interrupting capability of the circ u it

breaker shall be equal to K times rated short-circuit cu rrent.

5. Within the l i m itations stated in ANSI C37.04-1979, a l l values a pply to polyphase and l i ne-to-line fau lts. For single phase-to-g round fa u lts,

the specific conditions stated in clause 5.10.2.3 of ANSI C37.04-1979 a pply.

6. Current values in this row are not to be exceeded even for operating voltage below 1 /K times rated maxim u m design voltage. For ope rat-

ing voltages between rated maxi m u m design voltage and 1/K times rated maxi m u m design voltage, follow footnote 5 above.

7. Cu rrent values i n this row are independent of operating voltage up to and including rated maxi m u m design voltage.

8. " Nominal 3-Phase MVA Class" is included for reference only - this information is not l isted in ANSI C37.06-1987.

9. Standard d uty cycle is CO - 1 5sec - CO

Units

MVA

••

kV rms

- -

Power Frequency

kV rms

Lightning Impulse (BIL)

kV crest

A rms

kA rms-

I ) "

sym

101

Cycles

( Y )

Sec

KV rms

kA rms-

kA rms

kA peak

Circuit Breaker T ype

5-3AH

5-3AH-

7-3AH-

1 5-3AH-

250

350

500

4.16

7.2

1 3.8

250

350

500

4.76

8.25

1 5.0

1.24

1.19

1.25

1.30

1 200

2000

3000

1 8

3.85

4.0

6.6

11.5

78 opt"'

77 opt"'

58 opt"'

111

132

1 32 opt m

97 opt"'

1 30 opt"'

1 5-3AH-

38-3AH-

750

1000

1 500

13.8

1 3.8

750

1000

1 500

1 5.0

1.30

1.65

1 50

1 200

2000

3000

2 1

11.5

77 opt"'

1 30

130 opt"'