Sf6 Outdoor High Voltage Vacuum Circuit Breaker Zw20-12f

• Customization: Available
• Breaking Capacity: High Voltage Circuit Breakers
• Operation: Manual Type
• Model NO.: ZW20A-12F
• Speed: High-Speed Circuit Breaker
• Arc-extinguishing Medium: SF6
• Installation: Fixed
• Structure: MCB
• Poles Number: 3
• Type: Circuit Breaker
• Function: Conventional Circuit Breaker, Overcurrent Protection
• Certification: ISO9001-2000
• Ambient Temperature: -40℃-+40℃
• Altitude: Not Over 3000m
• Power Grid Frequency: 48 ~ 52Hz
• Relative Humidity: Not Higher Than 90% (25℃)
• Transport Package: Export Box
• Trademark: DGG
• Origin: China
• HS Code: 8535210000
• Production Capacity: 100000PCS/Year
• Package Size: 130.00cm * 100.00cm * 100.00cm
• Package Gross Weight: 120.000kg

Product Description

PHOTOS OF PRODUCT

GENERAL

In the realm of high-voltage power systems, specifically those operating at 110kV and above, a direct grounding strategy for the neutral point is typically employed. This approach, known as a high current effective grounding system, eliminates overvoltage issues at the neutral point. However, practical operations often necessitate an ungrounded neutral point method for certain transformers. This is crucial to limit single-phase short circuit current, avoid communication disruptions, and properly configure relay devices. Typically, only 30% to 50% of transformer neutral points are directly grounded to ensure the system's safety and stability. Additionally, in complex ring or radial power networks, dispatchers strategically control the power flow by operating some transformer neutral points in a non-direct grounding mode as needed. In normal, symmetrical three-phase operations, the neutral point maintains a potential of zero, obviating the need for overvoltage protection. Nonetheless, various disturbances such as lightning strikes, operational mishaps, and single-phase grounding faults can cause high overvoltage conditions at the transformer's neutral point, necessitating protective measures to prevent damage.

According to the electric power industry standard DLT620-1997 on Overvoltage Protection and Insulation Coordination for AC Electrical Installations, it is advised to avoid ungrounded systems in 110KV and 220KV effectively grounded systems to prevent excessive power frequency over-voltage. In scenarios where partial systems lack grounding, the over-voltage protection for 110kV and 220kV ungrounded neutral points, particularly on the supply side of low-voltage systems, should incorporate zinc oxide lightning arresters with parallel clearance for comprehensive protection.

Introducing the vacuum circuit breaker series, a state-of-the-art complete device engineered by Denggao Electric Co., Ltd. This comprehensive protection system is meticulously designed to shield transformer neutral points from insulation damage due to overvoltage, including transient and power frequency overvoltage, and switching overvoltage. Experience unparalleled safety and efficiency with our innovative complete device.

MODEL AND MEANING
USAGE ENVIRONMENTAL CONDITIONS

1. Outdoor Use
2. Ambient Temperature: Operates flawlessly between -40ºC and +40ºC
3. Relative Humidity: Maintains performance with humidity levels up to 90% at 25ºC
4. Altitude: Optimized for altitudes up to 3000 meters above sea level
5. Power grid frequency: Compatible with 48 ~ 52Hz for 50Hz systems and 58 ~ 62Hz for 60Hz systems
6. Installation site: Designed for locations free from corrosive gases, steam, and explosive dust, ensuring the utmost safety and durability.

TECHNICAL SPECIFICATION

number	Project		Unit	Reference
1	Rated voltage		kV	12
2	Rated current		A	630		1250
3	Rated frequency		HZ	50
4	Rated insulation level	1min power frequency withstand voltage	kV	42/48
		Lightning impulse withstand voltage		75/85
		Secondary circuit 1-minute frequency withstand voltage		2
5	Rated short-circuit breaking current		kA	16	20	20	25
6	Rated short-circuit making current (peak value)		kA	40	50	50	63
7	Rated short-time withstand current		kA	16	20	20	25
8	Rated peak withstand current		kA	40	50	50	63
9	Rated short-circuit breaking current breaking times		rate	30
10	SF6 Rated gauge pressure of gas		Mpa	0
11	mechanical life		rate	10000