Verview of FZW28-12 Outdoor Vacuum Load Break Switch

The FZW28-12 (FFK) outdoor High-Valtage Vacuum load break switch is designed for 12kV rated voltage and operates at a rated frequency of 50Hz in three-phase AC power systems. It is widely used for switching on and off load currents, overload currents, and short-circuit currents. This product is particularly suited for use in substations, industrial facilities, rural grid protection, and automated power distribution systems with frequent switching requirements.

The load break switch is comprised of the FZW28-12 vacuum load break switch and its control unit, which are electrically connected through aviation connectors and sealed control cables. It reliably detects and isolates zero-sequence currents and interphase fault currents within and outside its network boundary. This versatility makes it suitable for various neutral point earthing systems in power distribution networks.

Type Designation for FZW28-12 Vacuum Load Break Switch

• FZW: Outdoor vacuum load break switch.
• 28: Design sequence number for the product series.
• 12: Rated voltage (kV).
• /T: Denotes the spring-operated mechanism.
• □: Represents the rated current (A).
• □: Indicates the rated short-time withstand current (kA).

Operating Conditions:

1. Temperature Range: -25℃ to +70℃;
2. Altitude: ≤2000 meters;
3. Wind Speed: ≤35 m/s; Relative Humidity: ≤95%;
4. Seismic Performance: Seismic Intensity: 8 degrees; Horizontal Ground Acceleration: 1/4g;  Vertical Ground Acceleration: 1/8g; Safety Factor: 1.7;
5. Pollution Level: Grade III;
6. Maximum Ice Coating Thickness: ≤10mm;
7. System Neutral Grounding Modes: Supports ungrounded neutral, arc suppression coil grounding, and low-resistance grounding systems.
8. For special requirements or customization, please contact our technical team.

Technical parameters for FZW28 Vacuum Load Break Switch

Sr.	Name		Unit	Value
1	Rated voltage		KV	12
2	Rated insulation level	1min power frequency withstand voltage	KV	Dry test	42/48
		Lightning impulse withstand voltage		Wet test	34
3	Rated frequency		Hz	50
4	Rated current		A	63
5	Rated delay withstand current and duration		KA/4s	16	20
6	Rated peak withstand current		KA	40	50
7	Rated short-circuit breaking current		KA	40	50
8	Mechanical life		Times	20000
9	Net weight		kg	198

Structural Features of FZW28

• Automatic Locking of Phase-to-Phase Short Circuit Faults: In the event of a short-circuit fault in a user’s branch line, the sectionalizing switch automatically trips and locks immediately after the substation breaker or recloser protection is triggered. This ensures rapid isolation of the fault and enables the substation to reclose quickly, restoring power to unaffected branch users on the feeder line.
• Quick Fault Point Location: When a branch line fault occurs, the affected user proactively reports the fault information to the power company. Using advanced handheld computers or communication modules, utility personnel can efficiently locate and address the fault, ensuring swift fault resolution with minimal disruption.
• Automatic Isolation of Single-Phase Ground Faults: If a single-phase ground fault occurs on a user’s branch, the sectionalizing switch automatically trips to isolate the fault. This ensures that substations and other feeder users remain unaffected, maintaining uninterrupted power supply for other parts of the system.

Functional Features

1. Comprehensive Protection Functions: Instantaneous trip protection, overcurrent protection, and zero-sequence protection ensure the system’s safety during fault conditions. Anti-surge protection safeguards the system from inrush currents.
2. Advanced Reclosing Capabilities: Supports three-shot reclosing with post-reclose acceleration, allowing for swift fault recovery and system stability.
3. Real-Time Monitoring and Event Recording: Features real-time status inquiry and event logging, providing detailed records of system activity and fault conditions for analysis and troubleshooting. Enables parameter configuration through handheld devices or remote systems, increasing operational flexibility.
4. Efficient Communication Capability: Integrated GSM messaging and proactive fault reporting ensure timely communication of system status and faults to operators.
5. Additional Features: Real-time clock functionality for precise system coordination. Smart handheld control and local/remote configuration options allow operators to easily manage system settings.Fault isolation and active reporting capabilities minimize downtime and enhance reliability.

Drawing, Installation and Maintenance

Ordering Guidelines

To ensure accurate ordering and customization, please provide the following information:

1. Specify Requirements: Clearly state the rated voltage (e.g., 12kV), current (e.g., 63A), short-time withstand current, and additional features such as GSM modules or remote monitoring functionalities.
2. Customization Requests: If you need non-standard configurations, enhanced protections, or integration with specific control systems, please provide detailed information.

For tailored solutions or inquiries about unique configurations, our technical team is ready to assist you. Contact us today to discuss your specific requirements.

Technical FAQs for FZW28-12 Outdoor Vacuum Load Break Switch

1. What applications is the FZW28-12 load break switch designed for?
   It is ideal for 12kV power systems in substations, industrial facilities, rural grids, and automated power distribution networks with frequent switching requirements.
2. How does the FZW28-12 handle fault isolation?
   The switch features automatic locking for phase-to-phase short-circuit faults and single-phase ground fault isolation, ensuring uninterrupted power supply to unaffected users.
3. What environmental conditions can the FZW28-12 withstand?
   The switch operates reliably in temperatures ranging from -25°C to +70°C, with pollution resistance up to Grade III and seismic intensity up to 8 degrees.
4. Does the FZW28-12 support remote monitoring and control?
   Yes, it integrates GSM messaging, real-time fault reporting, and remote system configuration, making it suitable for smart grid applications.
5. What is the mechanical lifespan of the FZW28-12?
   The switch is rated for 20,000 mechanical operations, ensuring durability and reliability for long-term use in demanding environments.
6. Can the FZW28-12 be customized for specific operational needs?
   Yes, it offers customization options, including GSM modules, non-standard configurations, enhanced protections, and integration with specific control systems. Contact the technical team for tailored solutions.

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