Dead-Tank Outdoor Circuit Breaker SDV6

Description

Extended ratings and reliability
In 2006, Siemens introduced the new global class dead-tank SDV6 outdoor vacuum circuit breaker with the trustworthy Siemens 3AH3 vacuum circuit breaker. Designed specifically for the U.S. ANSI market, the stationary distribution vacuum circuit breaker has passed the entire ANSI type-testing program and provides a significant increase in performance over its predecessor, the SDV4A, in a full range for three voltage classes (15 kV, 27.6 kV, 38 kV) and up to 40 kA. Each group is specifically designed to optimize space and material for the voltage class while retaining common features across the entire product line.

Superior dead-tank design
The distinguishing feature of SDV6 dead-tank technology is that the interrupter chambers are accommodated in an earthed metal housing. With the 3AH3 vacuum interrupter, the poles are mounted directly onto the operator. A gearbox allows for quieter operation with reduced vibration. All key components are accessible from the front for easy servicing. However, in outdoor applications maintenance is only needed at a 5 year/’10,000 operations on any circuit’ interval, if the ANSI ‘usual service’ conditions are applied.

Meeting the most demanding requirements
The SDV6 outdoor vacuum circuit breaker can be provided with the capability of maintaining structural integrity during and following seismic disturbances as appropriate for the specified UBC zones 1-4. In addition, the SDV6 meets the following standards:

IEEE C37.04-1999 Rating Structure for A-C HV Circuit breakers
IEEE C37.09-1999 Test Procedure for A-C HV Circuit breakers
IEEE C37-06-200X Draft 7.8 (September 2006) Preferred Ratings A-C HV Circuit breakers
NEMA SG-4-2000 A-C HV Circuit breakers

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Technical Data

Rated operating current	1,200 A to 3,000 A
Rated voltage acc. to ANSI C37-60	15.5 kV; 27.6 kV; 38 kV
Short-circuit breaking current	25 kA to 40 kA
Lightning impulse withstand voltage	110 kV to 200 kV
Operating sequence	O – 3min – CO – 3min – CO
Opening time	< 80 ms
Closing time	< 50 ms *¹
Number of operating cycles	10,000 *²
Number of short circuit operations	up to 100
Standards	ANSI C37.20; IEEE C037.06

*1 with 48 Vdc, 125 Vdc or 250 Vdc trip voltage or capacitor trip
*2 60,000 operations with overhaul and vacuum interrupter replacement
at 10,000 operations

Rated voltage	Short-circuit breaking current (kA)	Lightning impulse withstand voltage (kV)	Operational current (A) 1,200 2,000 3,000
15.5 kV	20	110	■	■
	25	110	■	■
	31.5	110	■	■	■
	40	110	■	■	■
27.6 kV	20	150	■	■
	25	150	■	■
38 kV	20	200	■	■
	25	200	■	■
	31.5	200	■	■
	40	200	■	■

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