Outdoor High Voltage Vacuum Breaker Circuit Breaker with Protective

• 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: -40ºC-+40ºC
• Altitude: Not Over 2000m
• Power Grid Frequency: 48 ~ 52Hz
• Relative Humidity: Not Higher Than 90% (25ºC)
• 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
• Lead Time: 15 days (1 - 1 Pieces) ; To be negotiated ( > 1 Pieces)

Product Description

CAPTIVATING VISUALS OF OUR PRODUCT

CORE DETAILS

In power systems operating at 110kV and above, a neutral point direct grounding approach is often used, known as a high-current effective grounding system. This method eliminates overvoltage and protection concerns at the neutral point by directly grounding the transformer's neutral point. However, to manage single-phase short circuits, mitigate communication interference, and meet relay setting requirements, some transformers may operate with ungrounded neutral points. Typically, only 30% to 50% of transformers' neutral points are directly grounded to ensure system safety and stability. In specific ring or radial power supply networks, dispatchers may intentionally operate certain intermediate terminal transformers in a non-direct grounding mode to direct power flow as needed. During normal three-phase operation, the neutral point potential remains zero, requiring no overvoltage protection. However, factors such as lightning, operational incidents, disconnections, or single-phase grounding faults can elevate the neutral point's overvoltage, risking damage that necessitates protective measures.

According to the electric power industry standard DLT620-1997, titled 'Overvoltage Protection and Insulation Coordination for AC Electrical Installations,' it's advised to avoid local ungrounded systems in 110kV and 220kV effectively grounded systems to prevent excessive power frequency over-voltage. For these partially ungrounded systems, it recommends using zinc oxide lightning arresters with parallel clearance for over-voltage protection of ungrounded neutral points at 110kV and 220kV with power supplied from the low-voltage side.

Our company proudly presents the DGNPD series transformer neutral point gap grounding protection complete device. This innovative solution is engineered to shield against transformer neutral point insulation damage and tackle overvoltage incidents, including switching overvoltage and power frequency transient overvoltage.

MODEL SIGNIFICANCE AND INTERPRETATION
OPERATIONAL ENVIRONMENTAL PARAMETERS

1. Designed for Outdoor Application
2. Ambient Temperature Range: A robust tolerance from -40ºC to +40ºC
3. Maximum Relative Humidity: 90% at 25ºC
4. Maximum Operating Altitude: 3000m
5. Power Grid Frequency: Capable of 48 ~ 52Hz for 50Hz systems and 58 ~ 62Hz for 60Hz systems
6. Installation Conditions: Air must be devoid of corrosive chemical gases, steam, and explosive dust.

DETAILED TECHNICAL SPECIFICATIONS

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