LZZBJ9-12 Indoor Epoxy Resin Current Transformer is a fully enclosed epoxy resin cast pillar-type current transformer designed for indoor power systems up to 10kV and 50Hz/60Hz. It is ideal for current measurement, energy metering, and relay protection, particularly in compact spaces like ring-net or switchgear cabinets. Durable and resistant to pollution and humidity, it ensures reliable performance in medium-voltage applications.

LZZBJ9-12 Current Transformer Type designation

breakdown of the LZZBJ9-12 Current Transformer model code.

• L: Current Transformer
• Z: Post type
• Z: Casting resin insulated
• B: With protection.
• J: Enhancement type.
• (9): Design sequence.
• -12: Voltage rating (12 kV).
• 150b/2s: The Construction Code.

The LZZBJ9-12 current transformer type designation provides a clear breakdown of its structure, voltage grade (12kV), design sequence, protection features, and insulation type, enabling technicians to quickly interpret and configure the model for precise application needs.

LZZBJ9-12 Current Transformer Service conditon

• Altitude: Up to 1000m
• Ambient Temperature: Ranges from -5°C to +40°C
• Relative Humidity: Maximum 90% at 20°C
• Environment: Free from harmful gases, chemicals, and pollutants that could affect insulation performance.
• Vibration: Stable operation with no chattering or impacts.

The LZZBJ9-12 current transformer features a fully enclosed epoxy resin cast pillar structure, designed to withstand varying climatic and altitude conditions. It is resistant to pollution and humidity, ensuring reliable operation under specified indoor conditions. Proper installation as per the given parameters guarantees stable, safe, and long-lasting performance.

LZZBJ9-12 Current Transformer Construction

The LZZBJ9-12 is a leg-type, fully enclosed current transformer with a durable ring core and cast resin insulation for its primary and secondary windings. This design ensures dependable performance in medium-voltage systems up to 10kV, even in environments with high humidity and pollution level II.

Outlet Markings:

• Primary Terminals: P1, P2
• Secondary Terminals (Group 1): 1S1, 1S2
• Secondary Terminals (Group 2): 2S1, 2S2

Operational Guidelines:

• The primary current flows from P1 to P2, while the secondary current flows from S1 to S2 through an external return circuit.
• Warning: High voltage may be generated if the secondary circuit is left open while the primary current is active. Always keep the secondary circuit securely closed during operation to maintain safety and stability.

This construction makes the LZZBJ9-12 a reliable and efficient solution for modern indoor power systems, delivering consistent performance in demanding conditions.

LZZBJ9-12 Current Transformer Technical Parameters

The LZZBJ9-12 Current Transformer meets power grid standards with a rated insulation level of 12/42/75 kV, frequencies of 50Hz or 60Hz, and secondary currents of 5A or 1A, adhering to GB1208-1997 standards. Supporting primary currents from 20A to 3000A, it offers high precision (0.2S, 0.5/10P10), robust performance (thermal current up to 100kA, dynamic current up to 160kA), and customizable solutions for unique applications.

Rated Primary Current (A)	Accuracy Class Combination	Rated Output (VA)	Short-time Thermal Current (kA)	Rated Dynamic Current (kA)
20~100	0.2S/10P10	10/15	150Iln	375Iln
150~200	0.2S/0.5/10P10	10/15/15	21.5	554
300~400	0.5/10P10	10/15	31.5	80
500~600	0.2/10P10	10/15	45	112.5
800	0.2S/10P10 0.2S/0.5/10P10 0.5/10P10 0.2/10P10	10/15 10/15/15 10/10 10/15	63	130
1000	0.2S/10P10 0.2S/0.5/10P10 0.5/10P10 0.2/10P10	10/15 10/15/15 10/10 10/15	80	160
1500	0.2/10P10	10/15	100	160
2000	0.2/10P10	10/15	100	160

Customization and Support: For unique applications or non-standard requirements, the LZZBJ9-12 Current Transformer can be customized to meet your needs, including specific current ratios or increased rated outputs. Contact us to discuss your requirements and ensure optimal performance and reliability.

Outline and Dimensions of Installation

LZZBJ9-12/150B/2s 10KV High-Voltage Current Transformers

LZZBJ9-12/150B/3s 10KV High-Voltage Current Transformers

FAQs for LZZBJ9-12 Current Transformer

1. What are the main applications of the LZZBJ9-12 Current Transformer?
   The LZZBJ9-12 is ideal for current measurement, energy metering, and protective relaying in medium-voltage indoor power systems, including ring-net and switchgear cabinets.
2. How does the epoxy resin construction enhance the performance of the LZZBJ9-12?
   The epoxy resin casting ensures superior insulation, UV resistance, and protection against environmental contaminants, providing long-term durability and reliability.
3. Can the LZZBJ9-12 Current Transformer be customized for specific applications?
   Yes, it offers customization for different voltage ratios, current outputs, and configurations to meet specific operational needs.
4. What maintenance is required for the LZZBJ9-12?
   The transformer requires minimal maintenance, mainly involving periodic inspections for cleanliness, operational integrity, and checking the fuse protection system.
5. What are the primary benefits of using the LZZBJ9-12 in medium-voltage systems?
   Its high precision, durability, and reliability in harsh conditions make it an ideal solution for efficient power monitoring and metering in medium-voltage indoor applications.
6. Is the LZZBJ9-12 compliant with international standards?
   Yes, the LZZBJ9-12 adheres to the GB1208-1997 standards, ensuring safety, reliability, and compatibility with power grid systems.

• Working Principle of Zero-Sequence Current Transformers
• Introduction to Combined Transformers and Their Classification
• Fault Handling Considerations for Current and Voltage Transformers
• Error Analysis and Maintenance of Current Transformers in Power Systems
• Zero-Sequence Current Transformers vs. Standard Current Transformer
• A Discussion on the Saturation Point of Current Transformers: Transformer Protection and Current Protection