The LJ-ZW32-10(12) Zero-Sequence Protection Current Transformer is designed for precise monitoring and protection in medium-voltage power systems. Tailored for ZW32-10 Vacuum Circuit Breakers, it generates zero-sequence current signals for reliable fault detection, circuit isolation, and alarm triggering.

Featuring silicon rubber insulation, it delivers superior pollution resistance, moisture protection, and durability, with a wet withstand voltage 1.5 to 2.5 times greater than traditional epoxy resin products. Its robust construction ensures excellent impact resistance, anti-creep performance, and explosion-proof reliability, making it ideal for demanding outdoor applications. This high-performance Zero-Sequence Protection Current Transformer is perfect for applications requiring energy metering, current measurement, and relay protection.

LJ-ZW32-10(12) Zero-Sequence CT Type designation

The Key Features and Structure of LJ-ZW32-10(12) Current Transformers:

• L: Represents “Current Transformer.”
• J: Indicates “Zero-Sequence Combined Type.”
• ZW32: Specifies the model designed for ZW32 Vacuum Circuit Breakers.
• 10(12): Refers to the rated voltage, compatible with 10kV or 12kV power systems.

This designation clearly outlines the technical specifications and structure of the LJ-ZW32-10(12) Current Transformer, ensuring precise identification and suitability for specific applications.

LJ-ZW32-10(12) Service conditon

• Location: Suitable for outdoor use.
• Temperature: -25°C to +40°C.
• Humidity: Maximum relative humidity of 95%.
• Altitude: ≤2000m.
• Average Daily Temperature: ≤40°C.
• Pollution Level: Class II.

These specifications ensure the LJ-ZW32-10(12) Current Transformers deliver reliable and consistent performance across a variety of demanding environmental conditions.

Construction of Zero-Sequence Protection Current Transformer

The LJ-ZW32-10(12) Current Transformer is constructed with advanced materials and a robust design to ensure durability and reliability:

• Core and Windings: High-quality core material with precise primary and secondary windings for accurate current transformation and signal transmission.
• Insulation: Cast-resin insulation provides excellent dielectric strength, moisture resistance, and pollution resistance, ensuring stable operation in outdoor environments.
• Zero-Sequence Design: Integrated zero-sequence protection for monitoring and responding to ground faults or leakage currents in the system.
• Structure: The transformer features a compact and fully enclosed design, with excellent impact and vibration resistance, making it suitable for pole-mounted applications.
• Terminal Connections: Clearly marked primary (P1, P2) and secondary (S1, S2) terminals for easy and secure connections during installation.

This construction ensures the LJ-ZW32-10(12) Current Transformer delivers exceptional performance, safety, and durability in medium-voltage outdoor power systems.

LJ-ZW32-10(12) CT Technical Parameters

The LJ-LZW32-10(12) Current Transformers are designed for 10kV and 12kV power systems, supporting primary currents from 100A to 1200A and secondary currents of 5A (optional 1A). With a 5P10 accuracy class, rated outputs from 2.5VA to 25VA, and an insulation level of 10(12)/42kV, they deliver precise measurement and reliable relay protection.

Type	Rated Primary Current (A)		Rated Secondary Current (A)	Accurate & Rated Output (VA)			Rated Insulation Level (kV) </tdth
				5P10
LJ-LZW32-10(12)	100, 150, 200		5(1)	2.5	3.74	5	10(12)/42
	100, 200, 300			2.5	5	7.5
	200, 300, 400			5	7.5	10
	200, 400, 600			5	10	15
	600, 800, 1000			15	20	25
	800, 1000, 1200			15	20	25
	Zero Sequence	20	1	0.1Ω
		50		0.2Ω

Customization: 

1. Special specifications or high-precision products can be manufactured according to user requirements.
2. During use, only one ratio of the current transformer can be used, multiple ratios cannot be used simultaneously.
3. This type of current transformer is specially designed for power system intelligence, lightweight, small size, and patented technology. The design is highly efficient, combining A, B, C phase protection and zero-sequence grounding protection.

Outline and Dimensions of Installation

LJ-ZW32-10(12) Zero-Sequence Protection Current Transformer Outline and Dimensions of Installation

 

Note: This page outlines the key details of the LJ-ZW32-10(12) Zero-Sequence Protection Combined Current Transformer, including construction features, service conditions, technical specifications, and installation guidelines. For additional assistance with model selection or tailored solutions for non-standard requirements, please reach out to our technical support team.

FAQs for LJ-ZW Zero-Sequence Protection Current Transformer

1. What are the primary applications of the LJ-ZW32-10(12) Current Transformer?
   This transformer is used for current measurement, energy metering, and relay protection in 10kV and 12kV power systems, particularly for ground fault detection in outdoor pole-mounted switchgear.
2. How does the zero-sequence protection feature work?
   The transformer monitors zero-sequence currents caused by ground faults or leakage currents and generates accurate signals to isolate the faulted circuit or trigger alarms.
3. What customization options are available for the LJ-ZW32-10(12)?
   Customizations include tailored current ratios, secondary outputs (5A or 1A), accuracy classes, and outputs to suit specific operational and environmental needs.
4. Can this transformer operate in polluted or humid environments?
   Yes, its silicon rubber insulation provides superior resistance to pollution and humidity, making it ideal for Class II environments.
5. What are the technical specifications for rated current and output?
   The transformer supports primary currents from 100A to 1200A, with a 5P10 accuracy class and rated outputs ranging from 2.5VA to 25VA.
6. Is the LJ-ZW32-10(12) suitable for high-altitude applications?
   The standard model is designed for altitudes up to 2000m. For higher elevations, customized versions can be manufactured to meet the requirements.

• Working Principle of Zero-Sequence Current Transformers
• Fault Handling Considerations for Current and Voltage Transformers
• Zero-Sequence Current Transformer Protection Principle and Applications
• Introduction to Combined Transformers and Their Classification
• Troubleshooting Techniques for Burnt Voltage Transformers
• Analysis and Troubleshooting of Common Issues with Current Transformers