The LAJ-10, LAJ-10Q, and LFZBJ-10KV Current Transformers are wall-mounted epoxy resin cast insulated products. LAJ-10Q CT serie is designed for all-condition operation, making it suitable for more complex and demanding environments. All series are designed for power systems with a rated frequency of 50Hz or 60Hz and a voltage of 10kV or below, making them ideal for energy metering, current measurement, and relay protection. These transformers ensure reliable performance and durability in various electrical applications.

LAJ-10 LFZBJ-10 Type designation

The type designation for the LA(FZB)J-10 Current Transformer is as follows:

• L: Current Transformer.
• A: Bulkhead type design.
• F: Bus separately.
• Z: Casting resin insulated.
• B: With protection.
• J: Design sequence.
• 10: Voltage grade, rated for 10kV.

This systematic designation clearly outlines the structural, insulation, and protection features of the transformer, making it suitable for precise application in power systems.

LAJ-10, LAJ-10Q, LFZBJ-10 CT Pictures

LAJ-10, LAJ-10Q, LFZBJ-10 Service conditon

• Altitude: Up to 1000m.
• Ambient Temperature: -5°C to +40°C.
• Relative Humidity: ≤90% at 20°C.
• Environment: Free from harmful gases, chemicals, or pollutants that may affect insulation.
• Operational Stability: Designed for stable operation without chattering or impact.
• Special Conditions for LAJ-10Q: Suitable for all-condition operation, ensuring reliable performance in more complex and demanding environments.

These conditions ensure optimal performance and durability for the LAJ-10 series current transformers in various power system applications.

Construction Overview of LAJ-10, LAJ-10Q Current Transformers

The LAJ-10, LAJ-10Q, and LFZBJ-10 series of wall-mounted current transformers comes in three configurations: single-turn, multi-turn, and busbar types. These transformers utilize resin casting insulation for superior durability and insulation performance. Models with a rated current of 300A and below feature a semi-closed structure, while models rated 400A to 800A adopt a hermetically sealed structure to enhance durability and reliability. The design reinforces external insulation, ensuring stable performance in demanding environments.

Primary and Secondary Windings:

• Primary Windings (P1, P2): Busbars extend from both ends of the transformer, facilitating easy wall-mounted installations.
• Secondary Windings (S1, S2): Located near the installation base with exposed terminals for quick access, easy installation, and secure connections.

Core Material: High-quality silicon steel minimizes energy losses and improves measurement accuracy.

Compliance: LAJ-10, LAJ-10Q, LFZBJ-10KV transformers fully adhere to GB1208-1997 and IEC60044-1 standards.

Applications: Designed for current measurement, energy metering, and relay protection in 10kV power systems.

These LAJ-10Q, LFZBJ-10 high-precision current transformers are an excellent choice for efficient and reliable operation in 10kV power systems, providing advanced insulation, durability, and performance in medium-voltage power applications.

LAJ-10Q, LFZBJ-10 CT Technical Parameters

Designed for 10kV power systems, the LZJC-10 Series Current Transformers support primary currents ranging from 5A to 3000A and provide multiple accuracy classes, including 0.2S, 0.2, 0.5, 10P10, and 10P15. With short-time thermal currents up to 40kA and dynamic currents up to 90kA, these transformers ensure precise measurement and reliable protection in demanding environments.

Rated Primary Current (A)	Accuracy Class Combination	Rated Output (VA)					Rated Short-time Current (kA/1s)	Rated Dynamic Current (kA)
		0.2S	0.2	0.5	10P10	10P15
5~100	0.2S/0.2S 0.210.2 0.2S/10P10 0.2/10P10 0.5/10P10 0.2/10P15 0.5/10P15	10	10	10	15	15	100|1n	250|1n
150							13.5	34
200							18	45
300							27	67
400							30	75
500							36	90
600
750							40
800
1000							–	–
2000~3000

Customization and Support: We provide flexible customization options for the LZJC-10KV Series Current Transformers, including tailored current ratios, enhanced outputs, and adaptations for specific environmental conditions. Contact us to design a transformer that meets your precise operational needs.

Outline and Dimensions of Installation

• Zero-Sequence Current Transformers vs. Standard Current Transformer
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• Causes of 35KV Current Transformer Damage
• Causes, and Solutions for Abnormal Heating in 10KV Current Transformers