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LW-252 Outdoor 220kV High Voltage SF6 Circuit Breaker | Hairui

The LW-252 outdoor SF6 circuit breaker is designed for the control and protection of 220kV transmission systems and is suitable for large substations and grid interconnection systems with extremely high requirements for insulation performance, reliable fault interruption, and operational availability. Since 220kV projects typically involve complex insulation coordination and system studies, the final selection should be based on the complete technical specifications, not just voltage and current ratings.

Why Choose Hairui Electric?

  • System-Level Technical Evaluation: For 252kV equipment, Hairui Electric reviews rated voltage and current together with transient recovery voltage, short-circuit level, line-charging duty, reclosing sequence, insulation coordination, and site conditions.
  • Customized Substation Integration: Pole spacing, terminal loads, conductor orientation, foundation interfaces, control cabinet placement, support structures, and secondary wiring can be coordinated with the switchyard layout.
  • Project Documentation Management: We support tender clarification and approval processes with technical schedules, dimensional drawings, foundation information, schematics, shipping details, and inspection documentation.
  • Manufacturing Quality Control: Critical components and assemblies are inspected according to the approved technical requirements. Mechanical operation, control circuits, sealing condition, and overall assembly are verified before dispatch.
  • International Project Coordination: Hairui Electric supports utility, EPC, and infrastructure projects requiring IEC-oriented specifications, multilingual technical communication, export packaging, and coordinated shipment.
  • Commissioning and Maintenance Support: Assistance is available for pre-installation checks, erection planning, gas-handling requirements, commissioning preparation, operating guidance, maintenance planning, and spare parts.
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Hairui Electric

Can't find what you're looking for?

For decades, Hairui has been dedicated to helping numerous well-known enterprises and institutions customize reliable equipment. With strong production capabilities and professional expertise, we ensure that our equipment is fully compliant and meets your requirements.

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Our Advantage

  1. Transmission-Class Interruption Capability: The LW-252 is designed to interrupt high fault currents and isolate faults within major transmission networks. Correct selection helps protect transformers, lines, busbars, and interconnected grid assets.
  2. High External and Internal Insulation Strength: The breaker combines SF6 internal insulation with outdoor insulators selected for the required lightning impulse, power-frequency withstand, altitude, and pollution conditions.
  3. Independent Phase Arrangement: Individual phase units facilitate phase-specific installation and mechanical arrangement. Depending on the selected design, operating modes can be coordinated with the protection and automatic-reclosing philosophy of the network.
  4. Reliable Operation Under Grid Disturbances: The breaker can be evaluated for terminal faults, short-line faults, out-of-phase conditions, line-charging current, and other transmission-system switching duties defined by the project.
  5. Lower Operating Energy: A self-energy interruption system can reduce the operating force required from the spring mechanism while providing effective arc extinction during high-current interruption.
  6. Maintainable Modular Construction: The phase units, operating mechanisms, control cabinets, gas compartments, and supporting structures are arranged to support inspection, testing, component access, and planned maintenance.
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Start Your Power Engineering Project

Our technical consultants offer 24/7 online consultation to assist you through the entire process, from drawing design and equipment selection to installation guidance.

What studies are needed before selecting a 252kV breaker?

Selection may require short-circuit analysis, insulation coordination, transient recovery voltage evaluation, line-charging assessment, switching-duty review, seismic calculations, and terminal-load verification.

Can the LW-252 be used for automatic reclosing?

A suitable configuration may support high-speed or delayed automatic reclosing. The required pole operation, dead time, operating sequence, relay logic, and system stability requirements must be specified.

How are SF6 leakage and density monitored?

Sealed gas compartments are supervised with density-monitoring devices that can provide local indication, alarm contacts, and lockout signals. The project should define the monitoring and station-control interfaces required.

What information is required for an accurate quotation?

Provide the single-line diagram, rated current, short-circuit current, system earthing, operating sequence, line parameters, insulation levels, control voltages, environmental data, terminal loads, applicable standards, and documentation requirements.

Can the breaker be customized for high-pollution environments?

Insulator creepage distance, shed profile, insulation level, anti-corrosion treatment, cabinet protection, and other measures can be evaluated for desert, coastal, industrial, or heavily polluted locations.

How is a 252kV circuit breaker shipped?

The equipment is normally divided into transport units according to its structure and shipping limitations. Packing configuration, lifting points, gas condition during transport, accessories, and site-assembly requirements are confirmed before delivery.

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