Siemens 38-3AH3 38 kV Maximum design voltage, Voltage levels Lightning-impulse BIL, Continuous4

Appendix

Table 12: Type 38-3AH3 vacuum circuit breaker ratings (new "constant kA" ratings basis)

		Measured parameter				Units	Circuit breaker type1
							38-3AH3-31	38-3AH3-40
General				Nominal voltage class		kV	38.0	38.0
Rated	Rated	Maximum design voltage (V)2				kV rms	38.0	38.0
values	voltage
			Voltage range factor (K)3			----	1.0	1.0
	Insulation	Withstand			Power-frequency	kV rms	80	80
	levels	voltage levels
					Lightning-impulse (BIL)	kV peak	150	150
	Rated				Continuous4	A rms	1,200, 2,000,	1,200, 2,000,
	current						3,000FC	3,000FC
		Short-circuit (at rated maximum design voltage)				kA rms sym	31.5	40
					(I)5, 6
					Interrupting time7	Cycles/ms	5/83	5/83
		Permissible tripping delay (Y)				Sec	2	2
Related	Current	Rated maximum design voltage (V) divided by K =				kA rms	38.0	38.0
required					(V/K)
capabilities		Maximum symmetrical (sym) interrupting (K x I)				kA rms sym	31.5	40
					%dc component	%	47	47
		Short-time current (K x I) (three-seconds)				kA rms sym	31.5	40
	Closing and		Asymmetrical (1.55 x I)			kA rms	49	62
	latching
					Peak (2.6 x I)	kA peak	82	104
	(momentary)

These ratings are in accordance with:

ANSI/IEEE C37.04-1999 Standard Rating Structure for AC High-Voltage Circuit Breakers

ANSI/IEEE C37.06-2009 AC High- Voltage Circuit Breakers Rated on a Symmetrical Current Basis - Preferred Ratings and Related Required Capabilities

ANSI/IEEE C37.09-1999 Standard Test Procedure for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis

ANSI/IEEE C37.010-1999 Application Guide for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis.

Footnotes:

1"xxxx" in type designation refers to the continuous current rating 1,200, 2,000 or 3,000 A, as appropriate. The 3,000 A fan- cooled rating is achieved using fan cooling as indicated in Footnote 4.

2Maximum design voltage the circuit breaker is designed for and the upper limit for operation.

3K is listed for informational purposes only. For circuit breakers rated on a "constant kA basis," the voltage range factor is 1.0.

43000FC indicates fan cooling is included in the switchgear structure for this rating. 3000 A rating is not available in outdoor equipment.

5All values apply to polyphase and line-to-line faults.

6Standard duty cycle is O - 0.3s - CO - 3 min. - CO.

7Three-cycle (50 ms) interrupting is optionally available.

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