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As a specialized manufacturer with over a decade of experience in electrical measurement solutions, Jinhua Dika Electrical Equipment Co., Ltd. designs and produces this Toroidal High Current Transformer to meet the rigorous demands of modern power grid infrastructure. Our transformer is engineered to provide reliable, accurate, and safe current measurement, which is fundamental for effective grid monitoring, fault detection, and protection systems. With an annual export value reflecting our global reach and a commitment to quality management systems, we deliver components that power utilities and industrial clients trust for critical applications.
This transformer is a key component for ensuring grid stability and safety. Its primary function is to accurately scale down high primary currents to standardized, manageable secondary levels for connection to meters, relays, and data acquisition systems.
- Superior Accuracy and Linearity: The toroidal (ring) core design, often using high-permeability materials like grain-oriented silicon steel or nanocrystalline alloys, ensures excellent magnetic coupling and minimal phase error. This results in high accuracy across a wide current range, from normal load conditions to fault currents, which is crucial for precise metering and sensitive relay operation.
- Robust Construction for Harsh Environments: Built for longevity in substations and industrial settings, the transformer features high-grade insulation materials capable of withstanding system voltage stresses. Enclosures are available with various Ingress Protection (IP) ratings to guard against dust and moisture.
- Flexible Installation Options: We offer both solid-core and split-core designs. Solid-core models provide maximum accuracy and are ideal for permanent installations on busbars or cables. Split-core variants allow for easy retrofitting onto existing live conductors without disconnection, minimizing downtime during installation or maintenance.
- Wide Current Range and Customization: The product can be tailored to specific primary current ratings, from a few hundred amperes to several thousand amperes. Secondary outputs are typically the industry-standard 1A or 5A, but other values can be manufactured upon request to interface with any monitoring equipment.
- Enhanced Safety and Isolation: The transformer provides essential galvanic isolation between the high-voltage primary circuit and the low-voltage secondary circuitry. This protects personnel and sensitive electronic equipment from high-voltage hazards, a fundamental safety requirement in power systems.
The technical specifications below outline some of the standard parameters for our toroidal high current transformers. All specifications can be customized to meet project-specific requirements.
| Parameter | Specification / Option |
|---|---|
| Primary Current (Ipn) | Customizable (e.g., 200A, 600A, 1200A, 3000A) |
| Secondary Current (Isn) | 1 A or 5 A (standard), others available |
| Accuracy Class at Rated Current | 0.5, 0.5S, 0.2, 0.2S (selectable) |
| Frequency | 50 Hz, 60 Hz, or 50/60 Hz |
| Burden (at rated current) | e.g., 2.5 VA to 15 VA |
| Insulation Voltage | e.g., 3 kV / 50 Hz / 1 min |
| Operating Temperature Range | -25°C to +70°C (standard) |
The advantages of integrating our toroidal transformer into your power grid monitoring system are clear. It enables precise energy measurement for billing and load analysis, provides the critical input for protective relays to quickly isolate faults and prevent equipment damage, and supplies data for Supervisory Control and Data Acquisition (SCADA) systems, allowing for real-time grid management. For end-users, this translates into improved grid reliability, enhanced operational safety, optimized asset utilization, and compliance with utility metering standards.
Backed by Jinhua Dika's established manufacturing expertise and a portfolio of recognized management system certifications, this transformer represents a reliable choice for global infrastructure projects. Our products reach diverse markets from North America and Western Europe to Southeast Asia and Africa, supported by efficient logistics from major Chinese ports. We understand the critical nature of power grid components and are committed to providing durable, accurate, and customizable solutions. For detailed specifications, custom design requests, or to discuss how this transformer can be integrated into your specific monitoring or fault detection scheme, please contact our technical sales team.
Frequently Asked Questions (FAQ)
Q1: What is the main difference between a solid-core and a split-core toroidal transformer?
A: A solid-core transformer has a continuous, unbroken core, offering the highest possible accuracy and stability, and is installed by threading the conductor through the center. A split-core version has a hinged or two-part core that can be opened and clamped around an existing conductor, allowing for installation without system shutdown, though with a slight compromise on ultimate accuracy.
Q2: Can this transformer be used for both 50Hz and 60Hz power systems?
A: Yes, many of our standard models are designed to perform accurately at both 50Hz and 60Hz. It is important to specify your system frequency when inquiring or ordering to ensure the correct product is supplied.
Q3: How do I select the correct primary current rating?
A: The primary current rating should be equal to or greater than the maximum continuous current expected in the conductor where it will be installed. It's common practice to choose a rating about 20-30% above the normal operating current to ensure good accuracy across the load range and to handle temporary overloads.
Q4: What accuracy class should I choose for fault detection versus energy metering?
A: For energy metering (billing), high accuracy classes like 0.2S or 0.5S are typically required. For fault detection and protection relay applications, classes like 0.5 or 1.0 are often sufficient, as the priority is reliable operation over a wide current range (from low load to high fault currents).
Q5: Is external mounting hardware or a terminal box included?
A: Mounting brackets, bolts, and terminal boxes are often available as optional accessories. Please specify your installation requirements when requesting a quotation so we can provide a complete solution.
Q6: What is the typical delivery lead time for a custom-rated transformer?
A: Lead times vary based on the complexity of customization and order quantity. Standard models may ship quickly, while fully custom designs for specific primary currents, accuracy classes, or enclosures may require several weeks for engineering and production. We provide estimated lead times with every quotation.
Q7: Can you provide transformers for very high primary currents (above 5000A)?
A: Yes, we have the engineering capability to design and manufacture toroidal current transformers for very high current applications. Such projects require detailed technical discussions to determine the optimal core material, size, and construction.
Q8: Do you provide test reports or calibration certificates with the product?
A: Standard production testing is conducted on all units. Formal calibration certificates or type test reports from a recognized laboratory can be provided as an optional service for an additional charge, which is often required for utility projects.
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