Lifecycle Safety and Global Compliance Assurance Outdoor Voltage Transformer (VT/PT) Solution

1. Core Principle: Rooted in Safety and Compliance
   This solution is dedicated to providing clients with absolutely safe and reliable outdoor voltage transformer solutions that fully comply with global and regional regulations. It ensures comprehensive protection for personnel, equipment, and grid safety under extreme operating conditions throughout the entire lifecycle—from design and manufacturing to field installation, operation, and maintenance.

2. Strict Adherence to Authoritative Standards
   The equipment fully complies with the highest international, national, and industry standards, including:

• International Standards: IEC 60044-2/-3/-7, IEEE C57.13

• Chinese National Standards: GB/T 20840

• Industry Specifications: Lightning impulse withstand voltage (LI) and switching impulse withstand voltage (SI) exceed the system's maximum overvoltage peaks.
  Every unit undergoes type tests certified by authoritative bodies (e.g., CNAS-accredited laboratories), with traceable test reports provided.

1. Comprehensive Safety Design Assurance

1. Superior Insulation Performance:

• Main & Longitudinal Insulation: Utilizes composite insulation structures with withstand voltage strength significantly exceeding system limit overvoltages (including LI/SI surges), eliminating breakdown risks.

• Insulation Materials: Resistant to extreme environments (-40°C to +70°C, humidity >95%), ensuring stability throughout the 30-year lifespan.

2. Intrinsic Explosion-Proof Mechanism:

• Oil-Immersed PT Explosion Protection: Equipped with high-strength explosion-proof diaphragms and directional pressure relief channels, directing 100% of fault pressure to safe areas.

• Non-Oil-Filled Equipment: Employs solid insulation or SF6 gas-sealed structures, achieving maintenance-free explosion protection.

3. Multi-Layer Fault Protection:

• Internal Arc Protection: Meets the highest IAC AFLR class internal arc fault protection standard, directing arc energy release to prevent equipment rupture.

• Enclosure Protection: IP67 rating prevents ingress of dust, water, and small animals.

1. Safe Operation, Maintenance & Grounding Protection

1. Dual Grounding System:

• Independent dual grounding terminals provided for metal base and enclosure, using copper grounding cables with cross-sectional area ≥50 mm².

• Grounding system verified for dynamic and thermal stability, capable of withstanding 20 kA/1s short-circuit current impact.

2. Proactive Safety Warning:

• "High Voltage" hazard warning label applied on equipment body (compliant with ISO 7010 standard).

• Safety fencing and interfaces for audio-visual alarms provided at installation points.

1. Full Lifecycle Compliance Certification
   The equipment carries comprehensive mandatory certifications and access permits:

Solution Value
Safety Margin Exceeding Standards + Global Compliance Guarantee = Zero Legal Risk & Zero Safety Incidents
Through safety-by-design principles, end-to-end certification coverage, and proactive fault protection mechanisms, this solution provides worry-free assurance for high-risk scenarios like power grids, railways, and energy infrastructure.