The LB-10W 10kV Oil-Immersed Current Transformer is a steel tank, oil-immersed device designed for use in 10kV power systems with a frequency of 50Hz. It supports current measurement, energy metering, and relay protection, and can operate continuously at 120% of its rated current. Suitable for altitudes up to 4000m and ambient temperatures from -25°C to +40°C, the LB-10W ensures reliable performance in challenging environments.

LB-10W Type designation

The Key Features and Structure of LB-10W Current Transformer:

• L: Represents “Current Transformer.”
• B: Denotes “Voltage Grade” for 10kV systems.
• 10: Refers to the voltage grade, indicating suitability for 10kV power systems.
• W: Indicates “Outdoor Design” (indoor use also available).

This designation clearly identifies the LB-10W Current Transformer, ensuring an easy understanding of its technical features and suitability for both indoor and outdoor applications in demanding power system environments.

LB-10W Current Transformer Service conditon

1. Installation Location: Suitable for both indoor and outdoor applications.
2. Ambient Temperature: Operates reliably between -25°C and +40°C.
3. Ambient Conditions: Maximum relative humidity of 95%.
4. Altitude: Designed for use at elevations below 2000m.
5. Pollution Level: Complies with Class II antipollution standards.

These conditions ensure that the LB-10W Current Transformer performs efficiently and reliably in a variety of environments.

LB-10W Current Transformer Construction

The LB-10W outdoor single phase Current Transformer is a single-phase oil-immersed self-cooling type, designed for both indoor and outdoor applications. It features high-quality insulation and cooling oil to ensure reliable performance. The transformer uses advanced vacuum oil-filtering and vacuum oil-injection technology to enhance insulation and cooling efficiency.

Key features of its construction include:

• Oil Tank Design: The oil tank is equipped with an oiling valve and a waterproof, snowproof cover, ensuring protection against environmental conditions. An air hole is incorporated to regulate pressure and maintain oil quality. A diaphragm inside the tank isolates the oil from air, significantly reducing the oil oxidation rate.
• Thermal Stability: Engineered for high performance, the transformer achieves a thermal stability of 187.5 times its rating, ensuring durability under demanding conditions.
• Multiple Models: Available in four configurations:
  • Single-Ratio Single Secondary
  • Single-Ratio Double Secondary
  • Double-Ratio Single Secondary
  • Double-Ratio Double Secondary

Compliance and Application

The transformer supports CT classes for measurement and protection, including Class 0.2, 0.5, and 1.3 (D), making it suitable for precise energy metering and relay protection in various applications. Designed for use in 10kV power systems, the LB-10W delivers exceptional reliability and performance.

LB-10W CT Technical Parameters

The LB-10W outdoor single phase Current Transformer supports primary currents ranging from 20A to 400A, secondary configurations of single or double windings. It offers multiple accuracy classes, including 0.2, 0.5, and 10P10, with rated outputs of up to 15VA for measurement and protection needs. With a short-time thermal current of up to 30kA, a rated dynamic current of up to 50kA, the transformer delivers stable and reliable performance in demanding power systems.

Rated Primary Current (A)	Accuracy Classes Combination	Rated Output (kA)	Rated Short-Time Thermal Current (kA)	Rated Dynamic Current (kA)	Remarks
20	0.2/0.2 0.2/0.5 0.5/0.5 0.5/0.5 0.2/10P10 0.5/10P10	10/10 10/15 15/15 10/20 15/20	1.8	3.0	Secondary is single winding or double windings; both are acceptable.
30			2.7	4.5
40			3.6	6.0
50			4.5	7.5
75			6.75	11.25
100			9.0	15.0
150			13.5	22.5
200			18.0	30.0
300			27.0	45.0
400			30.0	50.0

Customization and Support: We offer customized solutions for the LB-10W outdoor single phase Current Transformer, including tailored current ratios, accuracy classes, and output ratings to meet your specific needs. Reach out to us to design a transformer perfectly aligned with your operational requirements.

Outline and Dimensions of Installation

Note: This product page provides comprehensive details about the LB-10W Current Transformer, including wiring diagrams, transformation ratios, technical specifications, accuracy, protection levels, operating principles, and dimensions. The information is for reference only. For assistance in selecting the appropriate model, our team of experts is available to guide you. Additionally, we offer customization services to meet unique requirements, including non-standard dimensions and configurations.

FAQs for LB-10kV Oil-Immersed Current Transformer

1. What are the primary applications of the LB-10W Current Transformer?
   The LB-10W is used for current measurement, energy metering, and relay protection in 10kV power systems for industrial and utility applications.
2. Can the LB-10W operate continuously under overload conditions?
   Yes, the LB-10W can operate continuously at 120% of its rated current, ensuring reliability under high-demand scenarios.
3. What customization options are available for the LB-10W transformer?
   Customizations include tailored current ratios, accuracy classes, secondary windings (single or double), and environmental adaptations for specific operational needs.
4. How does the oil-immersed design enhance transformer performance?
   The oil-immersed design provides superior insulation, cooling efficiency, and resistance to environmental factors like humidity and contamination, ensuring long-term durability.
5. What is the thermal stability factor of the LB-10W transformer?
   The LB-10W achieves a thermal stability factor of 187.5 times its rating, ensuring reliable performance under thermal stress.
6. Is the LB-10W suitable for outdoor installations in polluted areas?
   Yes, the LB-10W complies with Class II pollution standards and includes a waterproof and snowproof oil tank design, making it ideal for outdoor installations in moderate pollution zones.

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