LZZBJ12-10 Epoxy Insulated Indoor Current Transformer, is a 10KV High-Voltage Current Transformer, It is suitable for metering and protective relaying in indoor power systems, with a rated voltage of 10KV or below and a frequency range of 50–60Hz. It features a pillar-type structure, fully encapsulated with epoxy resin, offering high accuracy, low partial discharge, compact size, lightweight, and strong thermal and dynamic stability. It is resistant to humidity and pollution, operates reliably under various conditions, and requires no maintenance.

LZZBJ12-10 Current Transformer Type designation

The current transformer is available in three variants: LZZBJ12-10 A, LZZBJ12-10 B, and LZZBJ12-10 C.

The Key Features and Structure of LZZBJ12-10 Current Transformer:

• L: Represents the “Current Transformer” type.
• Z: Support type.
• Z: Cast-resin insulated
• B: Refers to the “With protective class”.
• J: Refers to the “Reinforced” design for enhanced mechanical strength.
• (12): Design code.
• 10: Denotes the voltage class

This model designation explains the LZZBJ12-10 current transformer, highlighting its reinforced, cast-resin insulated design, protection class, and suitability for different voltage classes in power systems.

LZZBJ12-10 Current Transformer Service conditon

• Altitude: ≤1000m
• Ambient Temperature: -5°C to +40°C
• Relative Humidity: ≤90% at 20°C
• Environment: Free from harmful gases, chemicals, or pollutants that could damage insulation.
• Vibration: Stable, without chattering or impact.

LZZBJ12-10 CT Construction

The LZZBJ12-10 current transformer features a leg-type, fully enclosed structure with a durable ring core. Its primary and secondary windings are insulated with cast resin, ensuring reliable operation under humidity condensation and pollution level II. The LZZBJ12-10 current transformer offers robust construction, reinforced insulation, and compliance with modern standards, ensuring reliable and efficient performance for high-voltage applications.

The outlet markings include:

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

Operational Notes:

During operation, the primary current flows through terminals P1 to P2, and the secondary current passes through S1 to S2 via an external return circuit.
Caution: High voltage may be generated if the secondary return circuit is left open while the primary current is active. To ensure safety and stability, the secondary circuit must remain closed during operation.

LZZBJ12-10 Current Transformer Technical Parameters

The LZZBJ12-10A 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. Complying with GB1208-1997 standards, it offers high precision (0.2S/0.5S) and customizable parameters, ensuring reliable performance and adaptability.

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	150I1n	375I1n
150~200			21.5	55.4
300~400			31.5	80
500~600	0.2S/10P10	10/15	45	112.5
800	0.2S/0.5/10P10	10/15	63	130
1000	0.2S/0.2S	10/10
1200	0.5/10P10	10/15	80	160
1500	0.2/10P10	10/15
2000			100	160
3000

Note: Explore the detailed specifications above to find the ideal LZZBJ12-10A current transformer model tailored to your specific application needs, including primary current, accuracy class, and rated output.

For specialized applications or if your requirements exceed the standard specifications, please contact our technical team for customized solutions. We can adjust the LZZBJ12-10A to accommodate unique current ratios, providing the flexibility and precision needed to meet your production demands while ensuring reliable performance in any setup.

Outline and Dimensions of Installation

FAQs for LZZBJ12-10 Current Transformer

1. What applications are suitable for the LZZBJ12-10 current transformer?
   The LZZBJ12-10 is ideal for metering and protective relaying in indoor power systems with a rated voltage of 10kV or below and a frequency range of 50Hz to 60Hz.
2. How does the epoxy resin insulation enhance the transformer’s performance?
   The epoxy resin provides superior insulation, resistance to humidity and pollution, and ensures stable performance under varying environmental conditions.
3. What safety precautions are required during operation?
   The secondary circuit must remain closed during operation to avoid the generation of high voltage, which can pose safety risks.
4. Can the LZZBJ12-10 be customized for specific operational needs?
   Yes, the transformer can be customized for unique current ratios, accuracy classes, or special environmental conditions to meet specific requirements.
5. What are the primary technical specifications of the LZZBJ12-10?
   The transformer features a rated insulation level of 12/42/75kV, secondary currents of 5A or 1A, and primary current ratings ranging from 20A to 3000A.
6. Is the transformer suitable for polluted environments?
   It is designed for pollution level II environments. For more severe conditions, additional protection or customization may be required.

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