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Integrated current transformer for protection and zero sequence measurement protection.jpg

Integrated Current Transformer for Protection and Zero Sequence Measurement - China Suppliers & Factory

Introducing the LJ-ZW32/43-10(12), a high-performance silicone-housed integrated current transformer specifically engineered for ZW32/43 vacuum circuit breakers. This compact device combines comprehensive A, B, and C phase measurement and protection capabilities with built-in zero-sequence grounding protection, making it an ideal solution for modern outdoor distribution networks in China, Available in ratios ranging from 20/1A to 600/5A and offering an impressive accuracy of up to class 0.5, the LJ-ZW32/43-10(1is designed to meet rigorous industry standards. With a robust insulation level of 12/42/75kV, this versatile current transformer ensures reliability and safety in challenging environments, As a leading factory and supplier in the industry, we provide optional secondary anti-open circuit modules for enhanced safety, making our product the preferred choice among professionals. Discover the reliability and efficiency of the LJ-ZW32/43-10(1for your electrical systems today!

Product Details

Product Functions

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Comprehensive Current Monitoring

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

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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.

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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.

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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

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Primary Application

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

ZW32-12 ZW43-12

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System Voltage

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

10kV / Um=12kV 50Hz

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Installation Setting

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

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Network Type

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

Product Highlights

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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.

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Robust Outdoor Construction

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

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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).

20/1A & 600/5A Class 0.5 / 10P20 / 5P10 1VA – 10VA

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Enhanced Safety Feature

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

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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.

Traditional Mode Fused Transformer Mode Custom Specs Available

Frequently Asked Questions

❓ What circuit breaker cabinets is this current transformer compatible with?

This current transformer is specifically designed for integration into ZW32-12 and ZW43-12 series outdoor vacuum circuit breaker cabinets operating on 10kV (Um=12kV) distribution networks. It is also compatible with both traditional electromagnetic relay systems and modern digital protection systems.

❓ What current ratios and accuracy classes are available?

The transformer supports current ratios of 20/1A and 600/5A. Accuracy classes include 0.5 (1VA) for measurement purposes, and 10P20 / 5P10 for protection applications. Capacities range from 1VA to 10VA. Custom specifications with higher precision are also available upon request.

❓ How does the zero-sequence coil improve ground fault protection?

The built-in zero-sequence coil provides dedicated signals for detecting single-phase grounding faults. This is especially important in isolated or compensated neutral networks where conventional phase current methods may not reliably detect high-impedance ground faults, significantly improving overall system safety.

❓ Is this transformer suitable for harsh outdoor environments?

Yes. The transformer features a durable silicone rubber housing that provides excellent resistance to UV radiation, moisture, pollution, and thermal aging. This makes it well-suited for harsh outdoor installations including overhead lines, cable feeders, and rural distribution networks.

❓ What is the anti-open circuit module and why is it important?

The optional integrated secondary anti-open circuit module is a safety feature that prevents dangerously high voltages from appearing on the secondary terminals if the circuit is accidentally left open. This protects both maintenance personnel and connected equipment from potential electrical hazards during operation or testing.

❓ Can this transformer be used in both measurement and protection applications simultaneously?

Yes. The all-in-one compact design integrates measurement coils (accuracy class 0.5) and protection coils (10P20/5P10) within a single unit. This allows simultaneous energy metering, phase overcurrent protection, short-circuit protection, and ground fault detection — all from one device, reducing cabinet space and simplifying wiring.