Dead Tank Vacuum Circuit Breaker(VCB)-36kV / 72.5kV

Product Description

Developed based on advanced core technologies and mature mass-production experience, the dry-air insulated dead-tank vacuum circuit breaker adopts vacuum interrupters for arc extinction and dry air as insulating medium. No decomposition of insulating gas occurs during current interruption, delivering high reliability and outstanding operational performance.

Product Features

Optimized for green procurement, this dead-tank VCB is designed under two core concepts: first, complying with eco-friendly design standards including the 3R principle (Reduce, Reuse, Recycle) and LS criteria (Long service life & Separable structure); second, cutting down the Life Cycle Cost (LCC) to balance economic efficiency and environmental protection.

Superior Interruption Performance：Equipped with vacuum interrupters for each breaking pole, the product features outstanding dielectric recovery capacity and achieves reliable performance under severe working conditions such as short-circuit interruption and short-line fault interruption.

Strong Resistance to Multiple Surges and Evolving Faults：Fitted with full self-arc-diffusion vacuum interrupters, the breaker can withstand multiple lightning surges and reliably interrupt evolving fault currents to accommodate complicated grid fault conditions.

Reduced Maintenance Workload：The vacuum-based breaking unit requires no routine inspection on core arc-extinguishing components, significantly saving maintenance man-hours and lowering long-term service costs.

Specifications

Construction

Overall construction

For each phase, a current breaking vacuum interrupter is accommodated in the grounded tank. The operation system is such that closing and tripping are effected by spring force.The operating mechanism and 3-phase interlinkage are assembled on a common base, which is installed on the frame legs.

Internal construction

The overall structure is composed mainly of grounded tank, vacuum interrupters (VI), insulating rods, bushings and main circuit terminals. Each grounded tank is filled with dry air maintained at a rated pressure of 0.5MPa-g (20℃).

Internal construction of vacuum circuit breaker

Performance

Performance of the circuit breaker has been designed in accordance with ANSI and IEC standard, and verified by type test. All products are shipped after confirmation of various performances by acceptance test based on these standards.

• Withstand voltage characteristics ：Performance of withstand voltage is assured at the specified dry air pressure. Even though the dry air pressure has been lowered to the alarming level, the required insulation level can be assured.In addition, even though this pressure lowers to the atmosphericpressure, the circuit breaker withstands the rated voltage.

• Current passing performance ：Since the main contacts are located under vacuum, their surfaces are never oxidized and current passing performance is therefore stabilized. In the closing mode of circuit breaker, a pressing force is exerted between main contacts by the effect of pressing spring and sufficient tolerance is assured against closing current and short-time current.