Precision Energy Measurement: Secondary Wire Type Current Transformer for CT Metering Product Overview
The Secondary Wire Type Current Transformer (CT) is a specialized instrument transformer designed for accurate current measurement and energy metering in electrical systems. By utilizing electromagnetic induction principles, it safely steps down high primary currents to standardized, measurable secondary levels (typically 1A or 5A), enabling precise monitoring, billing, and protection in commercial, industrial, and utility applications. Its robust construction and advanced design ensure reliability in diverse environments, from smart grids to manufacturing facilities.
Key Features & Technical Advantages
Non-Contact Current Sensing
The U-shaped or split-core design (as shown in the image) allows for easy clamp-on installation without interrupting live circuits. This eliminates downtime during maintenance or retrofitting.
High Permeability Core: Made from grain-oriented silicon steel or nanocrystalline alloys, it minimizes hysteresis losses and achieves accuracy classes of 0.2S to 1.0 (per IEC 61869-2), critical for billing-grade metering.
Safety & Isolation
Provides galvanic isolation between high-voltage primary conductors and low-voltage secondary circuits, protecting personnel and downstream equipment from faults.
Rated for CAT III/CAT IV environments (up to 600V) and compliant with IEC 61010-1 safety standards.
Wide Operational Range
Frequency: 50/60 Hz (standard), with extended ranges up to 400 Hz for aviation/specialized applications.
Temperature Stability: Operates from -40°C to +70°C, with thermal coefficients <50 ppm/°C to ensure accuracy across climates.
Compact & Durable Design
The bright blue polycarbonate housing (visible in the image) offers UV resistance, impact strength, and flame retardancy (UL94 V-0 rated).
IP50-IP67 protection options guard against dust and moisture ingress in harsh settings like substations or outdoor cabinets.
Technical Specifications
| Parameter | Specification Range |
|---|---|
| Primary Current Range | 100A to 5000A |
| Secondary Output | 1A or 5A (standard) |
| Accuracy Class | Class 0.5, 0.5S, 1.0 (IEC 61869) |
| Burden | 2.5 VA to 30 VA |
| Phase Error | <±10 minutes |
| Isolation Voltage | 3 kV to 6 kV (1 min withstand) |
Applications
Energy Metering & Billing
Integrates with kWh meters (e.g., ANSI C12.20-compliant devices) for precise utility billing in commercial buildings and industrial plants.
Supports time-of-use (TOU) tariffs in smart grids by providing stable data for peak/off-peak consumption tracking.
Power Monitoring & Analytics
Feeds data to SCADA systems, PLCs, or IoT gateways for real-time load profiling, demand forecasting, and power quality analysis (e.g., harmonics detection up to 15th order).
Protection & Control
Triggers relays or circuit breakers during overcurrent events (e.g., 150% of rated current for >2 seconds), preventing equipment damage.
Renewable Energy Integration
Monitors inverter output currents in solar/wind farms, ensuring grid compliance (e.g., IEEE 1547) and optimizing feed-in tariffs.
Compliance & Certifications
International Standards: IEC 61869-1/-2, ANSI C57.13, IEEE C37.20.2
Safety Certifications: CE, UL, RoHS, REACH
EMC Immunity: Tested per EN 61000-6-2 for industrial electromagnetic environments.
Why Choose This CT?
Installation Flexibility: The split-core design (evident in the image) allows retrofit without disassembling conductors, saving labor costs by 60% compared to solid-core CTs.
Long-Term Stability: Aging effects <0.1% per decade due to epoxy resin encapsulation and stress-relieved cores.
Global Compatibility: Works with major meter brands (Siemens, Landis+Gyr, Schneider Electric) and energy management platforms.
Conclusion: This Secondary Wire Type Current Transformer combines metering-grade accuracy with ruggedness for the most demanding electrical systems. Its innovative clamp-on design, compliance with global standards, and adaptability to smart grid needs make it an indispensable tool for modern energy management. For detailed datasheets or custom configurations (e.g., Rogowski coil hybrids), consult our engineering team.
