The LJ-ZW43-10(12) Zero-Sequence Protection Current Transformer is specifically engineered for 10kV and 12kV AC distribution systems with a rated frequency of 50Hz. It is primarily utilized with ZW2 and ZW43 air switches for three-phase current protection and measurement. Built using advanced superconducting magnetic materials, the transformer fulfills the dual requirements of high precision and high capacity. Encased in durable silicone rubber insulation, it provides exceptional resistance to extreme temperatures, corrosion, UV radiation, and aging. This design ensures long-term reliability, durability, and maintenance-free operation.

LJ-ZW3-10(12), LJ-ZW43 Type designation

The Key Features and Structure of LJ-ZW3-10(12) and LJ-ZW43-10(12) Current Transformers:

L: Current Transformer.
J: Zero-Sequence Current measurement.
ZW3, ZW43: Specifically designed for ZW3 and ZW43 vacuum circuit breaker models.
10, 12: Rated voltage for 10kV and 12kV power systems.

This designation highlights the LJ-ZW3-10(12) and LJ-ZW43-10(12) Current Transformers’ compatibility with ZW3 and ZW43 vacuum circuit breakers, showcasing their ability to accurately measure zero-sequence current and deliver advanced protection for modern power systems.

Service condition of LJ-ZW3-10(12), LJ-ZW43 CT

• Ambient Temperature: -25°C to +40°C
• Altitude: ≤2000m
• Average Daily Temperature: ≤40°C
• Pollution Level: Class II

Ensure the LJ-ZW43-10(12) and LJ-ZW3 series Zero-Sequence Integrated Current Transformers are installed correctly to achieve optimal performance and reliability.

LJ-ZW3-10(12), LJ-ZW43 CT Technical Parameters

The LJ-ZW43-10(12) Zero-Sequence Protection Current Transformers are advanced zero-sequence integrated devices designed for 10kV and 12kV power systems. Supporting primary currents from 20A to 1200A and secondary currents of 5A (optional 1A), these transformers deliver precise current measurement, reliable relay protection, and integrated zero-sequence grounding functionality. With a 5P10 accuracy class, rated outputs of 2.5VA to 40VA, and an insulation level of 10(12)/42kV, they ensure high accuracy and consistent performance. Featuring a compact, lightweight design, these transformers are ideal for modern intelligent power systems, offering versatile applications in current measurement, energy metering, relay protection, and enhanced zero-sequence safety.

Type	Rated Primary Current (A)		Assigning Combination	Rated Secondary Current (A)	Accurate and Rated Output (VA)						The Rated Insulation Level (kV)
					0.2S(0.5)			10P(5P)		5P20
LZW32-10(12) LZW43-10(12)	50, 75, 100		5P(10P)	5(1)				1	1.5	2.5	10(12)/42
	100, 150, 200				5	5	10	2.5	3.75	5
	100, 200, 300		10P20		5	10	15	2.5	5	7.5
	200, 300, 400		0.2S/10P 0.5/10P 0.2S/5P20 0.5/5P20		10	10	15	5	7.5	10
	200, 400, 600				10	15	20	5	10	15
	400, 600, 800				15	20	30	10	15	20
	600, 800, 1200				20	30	40	15	20	25
	800, 1000, 1200				30	40	50	20	30	40
	Zero Sequence	20	10P 3 Level	1	0.1Ω
		50	10P 1 Level		0.2Ω

Customization:

1. Tailored Solutions: We provide customized designs, including special specifications or high-precision configurations, to meet unique operational needs.
2. Single Ratio Operation: During usage, only one ratio of the current transformer can be utilized; multiple ratios cannot function simultaneously.
3. Patented Technology: Engineered with advanced patented technology, these transformers support A, B, C phase protection and zero-sequence grounding protection, offering a compact, lightweight, and highly efficient solution for modern power systems.

Contact us to create a solution customized to your specific power system requirements!

Outline and Dimensions of Installation

The LJ-ZW43-10(12) Zero-Sequence Current Transformer Outline and Dimensions of Installation

Note: This page provides comprehensive details about the LZW32-10(12) and LZW43-10(12) zero-sequence integrated Current Transformers, including technical specifications, accuracy, and installation guidelines. For assistance with model selection or to explore customized solutions tailored to your specific requirements, please contact our expert team for support.

FAQs for LJ-ZW Zero-Sequence Protection Current Transformer

1. What are the primary applications of the LJ-ZW3-10(12) and LJ-ZW43-10(12) Current Transformers?
   These transformers are used for current measurement, energy metering, relay protection, and zero-sequence fault detection in 10kV and 12kV AC power systems.
2. How does the zero-sequence functionality enhance system safety?
   The zero-sequence protection detects ground faults and leakage currents, enabling quick fault isolation and reducing the risk of equipment damage.
3. Can these transformers be customized for specific requirements?
   Yes, tailored configurations, including special current ratios, secondary outputs, and insulation enhancements, are available to meet unique operational needs.
4. What are the environmental conditions suitable for these transformers?
   The LJ-ZW3 and LJ-ZW43 are designed for outdoor use in temperatures ranging from -25°C to +40°C, altitudes up to 2000m, and pollution level Class II environments.
5. What makes the LJ-ZW43-10(12) more reliable in harsh environments?
   Its silicone rubber insulation provides superior resistance to extreme weather conditions, UV exposure, and pollution, ensuring durability and maintenance-free operation.
6. Are the LJ-ZW3 and LJ-ZW43 compliant with international standards?
   Yes, these transformers adhere to GB standards and are engineered with patented technologies, ensuring high performance and reliability in medium-voltage power

• Causes and Solutions for False Fault Alarms in Zero-Sequence Current Transformers
• Working Principle of Zero-Sequence Current Transformers
• Fault Handling Considerations for Current and Voltage Transformers
• 3 Voltage Transformer Faults and Solutions: Ensuring Accurate Measurement and Protection
• Error Analysis and Maintenance of Current Transformers in Power Systems
• Analysis and Troubleshooting of Common Issues with Current Transformers