ZW7-40.5/1600A Side-mounted/centre-mounted outdoor high-voltage vacuum circuit breaker

The ZW7 circuit breaker is the abbreviation for the ZW7-40.5 series outdoor high-voltage vacuum circuit breaker, specially designed for outdoor power transmission and distribution systems with a rated voltage of 35kV/40.5kV and a frequency of 50Hz (or 60Hz). It is mainly used in urban and rural power grids, industrial and mining enterprises and other places, responsible for breaking and closing load currents, overload currents and short-circuit currents.

The ZW7 circuit breaker integrates structural optimization and technological innovation, with the following core features:

Structural design: It adopts a porcelain pillar structure, with three phases installed on one mechanism box as a whole, and the overall structure is compact. Its design includes split poles, external or built-in current transformers (CT), and supports multiple installation methods such as side installation, center installation and edge installation. Among them, the center installation design can significantly reduce the overall dimensions of the equipment.

Core technology: Vacuum is used as the insulation and arc extinguishing medium, and the contacts are made of CuCr50 material and have a cup-shaped vertical field structure, which has the characteristics of strong breaking capacity, high insulation level, long service life and small size. It realizes oil-free and gas-free operation, and is safe and environmentally friendly.

Intelligence and control: It can be equipped with a spring operating mechanism (such as CT19BW) or an electromagnetic operating mechanism (such as CD10), supporting remote electric opening and closing and local manual operation. The intelligent controller has multiple functions such as instantaneous overcurrent protection, overcurrent protection, reclosing, event recording, zero-sequence protection and active fault reporting.

Environmental adaptability: The mechanical life can reach 10,000 times, and the maintenance workload is small. The normal working temperature range is generally -30℃ to +40℃, and it can reach -40℃ in alpine regions. The operating altitude is usually no more than 1000 meters or 2000 meters, and can reach 2700 meters or 3000 meters after external insulation correction. The mechanism box is waterproof and often equipped with heaters or dew controllers to cope with humid environments.

The main technical specifications of the ZW7 circuit breaker are as follows:

Rated voltage: 40.5kV.

Rated current: Covers multiple levels such as 630A, 1250A, 1600A, 2000A, 2500A, 3150A.

Breaking and closing capacity: The rated short-circuit breaking current is commonly 25kA and 31.5kA, and the rated short-circuit closing current corresponds to 50kA, 63kA and 80kA.

Mechanical parameters: The contact opening distance is about 22±2mm, the average opening speed is ≤2m/s, the average closing speed is about 1m/s, the closing time is ≤150ms, and the opening time is ≤60ms.

Compliance standards: The product design complies with the national standard GB1984 "AC High-voltage Circuit Breaker" and relevant IEC international standards.

The ZW7 circuit breaker is suitable for outdoor 35kV power transmission and transformation systems, urban and rural power distribution networks and power control and protection of industrial and mining enterprises, especially suitable for places requiring frequent operations. Its advantages lie in reducing installation and operation and maintenance costs through structural miniaturization and maintenance-free design; improving power supply reliability and safety by using vacuum arc extinguishing technology and intelligent control functions; good environmental adaptability ensures stable operation under various harsh conditions.

In summary, the ZW7-40.5 series outdoor high-voltage vacuum circuit breaker is a high-voltage switchgear with advanced design, reliable performance and wide application scope, and is one of the key equipment for oil-free transformation and construction of modern power grids.