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Product Description:
LZZBJ9-24 Current Transformer | 24kV Indoor Cast-Resin CT
Product Description:
The LZZBJ9-24 is a high-performance, post-type current transformer designed for 24kV indoor power systems. Manufactured with epoxy resin cast insulation, this device delivers reliable performance for current measurement, energy metering, and protective relaying in switchgears, distribution panels, and power substations. It meets both national standards (GB/T20840.1, 2) and international standards (IEC 61869-1, 2), ensuring compliance and reliability in global power infrastructure projects.
Features：
- Epoxy Resin Cast Insulation: Provides excellent electrical insulation and mechanical strength for indoor applications.
- Dual Secondary Current Options: Available in 5A or 1A to accommodate a wide range of metering and protection devices.
- Flexible Accuracy Class Combinations: Supports combinations such as 0.2(S)/0.2(S), 0.2(S)/10P, and 0.5(S)/10P to meet both high-precision metering and robust protection requirements.
- High Thermal & Dynamic Stability: Rated short-time thermal current up to 100kA and rated dynamic current up to 160kA ensures system reliability during fault conditions.
- Compact & Standardized Design: Optimized dimensions for seamless integration into standard 24kV switchgear panels.
Technical Specifications
| Parameter | Details |
| Rated primary current | 20A – 2500A |
| Rated secondary current | 5A or 1A |
| Rated frequency | 50–60Hz |
| Rated insulation level | 24/65/125kV |
| Ambient temperature | -5°C to +40°C |
| Standards compliance | GB/T20840.1, 2; IEC 61869-1, 2 |
| Rated secondary output | 10VA, 30VA, 20VA, 15VA (for 0.2(S), 0.5(S), 10P10, 10P15, 10P20) |
| 1s thermal stability current | 31.5kA – 100kA (model-dependent) |
| Rated dynamic current | 80kA – 160kA (model-dependent) |
Applications
The LZZBJ9-24 current transformer is ideal for a variety of critical power system applications:
- Power Distribution: Used in 24kV indoor switchgears and distribution panels for accurate current measurement and energy metering.
- Substation Automation: Integrated into protection and control systems for reliable fault detection and system monitoring.
- Industrial Facilities: Deployed in factories, data centers, and other industrial installations for power system protection and management.
- Renewable Energy: Suitable for integration into solar and wind power systems for grid connection and monitoring.
Installation & Usage Notes
- This product is designed for indoor use only.
- Installation must be performed in accordance with the manufacturer’s instructions and relevant electrical safety codes.
- The selection of accuracy class combination and rated secondary output should be based on the specific requirements of metering, measurement, and protection applications.
- For installations at altitudes exceeding 1000m, consult the factory for derating recommendations.
Specification:
Note: The current Ratio above are common type, other specifications can be provided according to customers’ requirements.
Application:
Widely are used in compact fully insulated ring net switch cabinets, and also used in the combined substation and cable distribution box.
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