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LJ-ZW32-24 Zero Sequence Protection Integrated Transformer
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LJ-ZW32-24 Zero Sequence Protection Integrated Transformer

The LJ-ZW32-24 Zero Sequence Protection Integrated Transformer is a versatile, silicone-housed device engineered for 24kV medium-voltage switchgear. It seamlessly combines three-phase (A, B, C) protection and zero-sequence ground-fault monitoring within a single, compact unit. Designed for integration with ZW32 series vacuum circuit breakers, it offers flexible current ratios like 20/1A and 600/5A, a robust 12/42/75kV insulation level, and optional internal safety modules. This transformer delivers a reliable, all-in-one solution for enhanced system protection and simplified installation.

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    Product Details

    Product Functions

    This integrated transformer provides dual protection in power distribution systems. Its primary function is to provide comprehensive overcurrent protection for all three phases (A, B, and C) to prevent equipment damage due to faults. Its integrated zero-sequence coil accurately detects ground fault currents, enabling sensitive ground fault protection, which is crucial for system safety and reliability. The device can also be used as a primary-secondary fuse-type transformer, providing necessary electrical isolation and converting high primary currents into standardized low secondary signals for connection to protective relays and control devices.

    Applicable Environment

    The LJ-ZW32-24 is specifically designed for integration into ZW32 series vacuum circuit breaker cabinets within 24kV indoor medium-voltage distribution networks. Its durable silicone rubber housing provides excellent resistance to moisture and environmental contaminants, making it ideal for use in compact switchgear, ring main units (RMUs), and indoor substations. It is suitable for controlled environments where reliable performance in space-constrained installations is required.

    Product Highlights

    ◆Dual-Function Integration: Unifies three-phase protection and zero-sequence earth fault protection in one device, streamlining system design and saving valuable panel space.

    ◆High-Voltage Application: Specifically rated for 24kV systems, featuring a high insulation level of 12/42/75kV to ensure safety and reliability under demanding operational conditions.

    ◆Durable & Resilient Design: The silicone rubber shell offers superior resistance to tracking, moisture, and pollution, ensuring long-term stability and performance.

    ◆Enhanced Safety Option: Allows for the internal installation of a secondary anti-open circuit module, preventing dangerous overvoltages and enhancing operational safety.

    ◆Customizable & Versatile: Supports user-specified special or high-precision designs and offers multiple standard ratios (20/1A, 600/5A) with different accuracy classes to meet diverse application needs.