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Help CenterLZZBJ9-10A 10kV Indoor Current Transformer for Substation Metering and Protection
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As a dedicated manufacturer with over a decade of experience in electrical equipment, Jinhua Dika Electrical Equipment Co., Ltd. is proud to present the LZZBJ9-10A 10kV Indoor Current Transformer. Engineered for precision and durability, this CT is a cornerstone component for modern substations, ensuring accurate energy measurement and reliable system protection. Our commitment to stringent quality management systems, including ISO 9001, is embedded in every unit we produce. We understand that the integrity of your power distribution network depends on the performance of its individual parts, which is why we focus on delivering current transformers that offer exceptional stability, high accuracy, and long-term operational safety. This product is designed to meet the rigorous demands of utilities, industrial plants, and commercial facilities worldwide, providing a dependable link between high-voltage circuits and control systems.
The LZZBJ9-10A is a versatile and robust current transformer specifically designed for indoor installation in 10kV switchgear, ring main units, and compact substations. Its primary function is to safely step down high primary currents to standardized, manageable secondary levels for connection to meters, relays, and protection devices. Below are its key features and technical advantages:
- Dual-Purpose Accuracy: This model supports both metering and protection functions with separate accuracy classes. It ensures revenue-grade precision for energy billing while providing the fast, reliable response needed to trigger protective circuits during fault conditions.
- Advanced Core Design: Utilizes high-permeability, low-loss silicon steel or nanocrystalline cores (available upon request) to minimize errors and ensure linear performance across a wide current range, from low loads to fault levels.
- Superior Insulation System: Features a cast resin insulation design that provides excellent dielectric strength, moisture resistance, and protection against environmental contaminants, making it ideal for indoor applications with potential humidity fluctuations.
- Compact and Safe Construction: The enclosed, fully insulated design enhances safety for personnel and adjacent equipment by preventing accidental contact with live parts. Its compact dimensions facilitate easy integration into space-constrained switchgear panels.
- Thermal and Dynamic Stability: Engineered to withstand high short-time thermal current (Ith) and dynamic current (Idyn) as per standards, ensuring the transformer remains intact and functional during short-circuit events.
- Customization Flexibility: We offer a range of customization options to match your specific project requirements, including different primary current ratings, secondary outputs (1A or 5A), mounting styles, and terminal configurations.
Here is a summary of typical technical specifications for the LZZBJ9-10A series:
| Parameter | Specification |
|---|---|
| Rated Voltage (Ur) | 10 kV |
| Rated Primary Current (Ipr) | Customizable: 100A, 150A, 200A, 300A, 400A, 500A, 600A, 800A, 1000A, 1200A, 1500A, 2000A |
| Rated Secondary Current (Isr) | 1A or 5A |
| Accuracy Class for Metering | 0.2S, 0.5S, 0.5, 1.0 (as per order) |
| Accuracy Class for Protection | 5P, 10P (as per order) |
| Rated Output (VA) | 2.5VA to 30VA (depending on accuracy class) |
| Rated Frequency | 50Hz / 60Hz |
| Insulation Level | LI75 AC28 / AC3 |
| Short-Time Thermal Current (Ith) | Up to 50 kA for 1s (typical, varies with ratio) |
| Dynamic Current (Idyn) | Up to 125 kA (peak, typical, varies with ratio) |
Benefits for Your Operations: Integrating the LZZBJ9-10A into your substation design translates into tangible benefits. For utility companies, the high metering accuracy (like 0.2S class) ensures fair and precise billing, reducing revenue loss. For industrial facilities, the reliable protection capability safeguards expensive machinery from damage due to overcurrents, minimizing downtime. The robust construction and adherence to international standards (IEC 61869) guarantee a long service life with minimal maintenance, providing a strong return on investment. Its indoor-specific design prioritizes safety and ease of installation within controlled environments.
Jinhua Dika Electrical supports a global clientele, with our products reaching markets across North America, Southeast Asia, Europe, and Africa. Our annual export value of US$1-1.5 million is a testament to the trust international partners place in our manufacturing capabilities and product quality. With a dedicated team of 11-50 professionals and a comprehensive quality assurance framework that includes ISO 9001 and ISO 14000 certifications, we ensure every LZZBJ9-10A current transformer is built to perform. We offer flexible shipping options from major ports like Shanghai, Tianjin, Guangzhou, and Ningbo. Choose a partner committed to precision and reliability. Contact us today to discuss your specific requirements, request a detailed datasheet, or place an order for your next substation project.
Frequently Asked Questions (FAQ)
Q1: What is the main difference between metering and protection accuracy classes in this CT?
A1: Metering accuracy classes (e.g., 0.2S, 0.5) are optimized for precision at normal load currents (from 1% to 120% of rated current) to ensure accurate energy measurement for billing. Protection classes (e.g., 5P, 10P) are designed to maintain accuracy at much higher overcurrents (up to the accuracy limit factor) to ensure protective relays operate correctly during faults.
Q2: Can this current transformer be used for both 50Hz and 60Hz power systems?
A2: Yes, the LZZBJ9-10A is typically designed to operate effectively at both 50Hz and 60Hz frequencies. The specific rated frequency should be specified at the time of ordering to ensure optimal core performance.
Q3: Is the primary winding busbar or cable-type?
A3: The LZZBJ9-10A is generally a bar-type (or bushing-type) current transformer. The primary conductor is a single straight bar (busbar) that passes through the center of the transformer. This design is common for indoor switchgear applications.
Q4: What mounting options are available?
A4: Standard mounting is typically via flanges or base plates designed for secure fixation onto panels or inside switchgear cubicles. Specific mounting hole patterns and dimensions can be provided in the technical drawings available upon request.
Q5: How do I select the correct primary current rating?
A5: The primary current rating should be chosen based on the maximum continuous load current expected in the circuit where it will be installed. It is common practice to select a rating slightly higher than the normal operating current to allow for future load growth and ensure the CT operates within its most accurate range.
Q6: What is the meaning of the insulation level "LI75 AC28 / AC3"?
A6: This indicates the transformer's withstand capability against voltage surges. "LI75" means it can withstand a 75kV lightning impulse voltage test. "AC28" refers to a 28kV power frequency withstand voltage test for the primary winding, and "AC3" refers to a 3kV test for the secondary winding. These values confirm its suitability for 10kV systems.
Q7: Do you provide test reports with the product?
A7: Yes, as a standard practice, we provide routine test reports for each batch or order, which include results for ratio error, phase displacement, insulation resistance, and dielectric tests. Additional type test reports can be provided upon request.
Q8: What is the typical delivery time for a custom order?
A8: Lead time depends on the order quantity and customization level. For standard specifications, production typically takes 3-4 weeks. We recommend contacting our sales team with your detailed requirements for an accurate delivery schedule.
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