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Integrated Current Transformer for Protection and Zero Sequence Measurement Protection
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Integrated Current Transformer for Protection and Zero Sequence Measurement Protection

The LJ-ZW32/43-10(12) is a silicone-housed, integrated current transformer designed for ZW32/43 vacuum circuit breakers. It combines A, B, C phase measurement and protection with built-in zero-sequence grounding protection in a single compact unit. Available in ratios from 20/1A to 600/5A with accuracies up to 0.5 class, and featuring a 12/42/75kV insulation level, this versatile device offers reliable performance for modern outdoor distribution networks. Optional secondary anti-open circuit modules enhance safety.

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    Product Details

    Product Functions

    ◆Comprehensive Current Monitoring: Provides simultaneous three-phase (A, B, C) current measurement for accurate load monitoring and energy metering.

    ◆Multi-Level Protection: Delivers protection-grade current signals for phase overcurrent and short-circuit protection, alongside dedicated zero-sequence signals for sensitive ground fault detection.

    ◆Integrated Ground Fault Protection: The built-in zero-sequence coil enables reliable detection of single-phase grounding faults, crucial for system safety in isolated or compensated networks.

    ◆System Flexibility: Can function as a conventional electromagnetic transformer or a primary-secondary fused device, compatible with both traditional relays and modern digital protection systems.

    Applicable Environment

    ◇Primary Application: Specifically engineered for integration into ZW32-12 and ZW43-12 series outdoor vacuum circuit breaker cabinets.

    ◇System Voltage: Rated for 10kV (Um=12kV) distribution networks, typically 50Hz systems.

    ◇Installation Setting: Designed for outdoor installation, with a durable silicone rubber housing providing excellent resistance to UV radiation, moisture, and pollution.

    ◇Network Type: Ideal for overhead lines, cable feeders, and rural distribution networks requiring compact, reliable phase and ground fault protection.

    Product Highlights

    ◆All-in-One Compact Design: Integrates measurement, phase protection, and zero-sequence protection coils within a single silicone-insulated shell, saving significant space and simplifying cabinet layout and wiring.

    ◆Robust Outdoor Construction: The silicone rubber housing ensures superior weatherproofing, thermal stability, and resistance to environmental aging, suitable for harsh outdoor conditions.

    ◆High Flexibility & Precision: Offers a wide range of configurable parameters: current ratios (20/1A, 600/5A), accuracy classes [0.5(1VA) for measurement, 10P20/5P10 for protection], and capacities (1VA to 10VA).

    ◆Enhanced Safety Feature: Optional integrated secondary anti-open circuit module prevents dangerous high voltages on open-circuited secondary terminals, protecting personnel and equipment.

    ◆Dual-Mode Operation & Customization: Supports both traditional and fused transformer applications. Special specifications and higher precision models are available upon request to meet unique project demands.