Whatsapp
The Zero Sequence Current Transformer is designed for earth fault detection and protection coordination in medium-voltage power systems. It is typically applied in 10kV distribution networks to monitor residual current generated under unbalanced or fault conditions, helping protection relays quickly isolate faulty circuits and improve system safety and reliability.
This model (LXK-Φ80-200) uses epoxy resin vacuum casting technology with a split-core structure, allowing installation without disconnecting primary cables. The core is manufactured from high-grade cold-rolled silicon steel, while the winding uses oxygen-free copper conductors to ensure stable magnetic performance and low loss during long-term operation.
A key advantage of this Zero Sequence Current Transformer is its split-core structure, which allows installation without disconnecting primary cables. The two-section core design, combined with clamping fixation, significantly improves on-site installation efficiency in retrofit and maintenance projects.
| Product Specifications | D | E | L | L1 |
| LXK-80 | Φ80 | 58 | 130 | 123 |
| LXK-100 | Φ100 | 58 | 130 | 122 |
| LXK-120 | Φ120 | 57 | 130 | 120 |
| LXK-150 | Φ150 | 58 | 190 | 123 |
| LXK-180 | Φ180 | 58 | 190 | 125 |
| LXK-200 | Φ200 | 60 | 280 | 129 |
| LXK-240 | Φ240 | 80 | 280 | 167 |
| LXK-260 | Φ260 | 55 | 280 | 120 |
| LXK-300 | Φ300 | 80 | 280 | 170 |
| Relay model | Relay coil connection method | Relay scale value | Zero-sequence current value (A) |
|
DD-11/60 DD-1/60 |
series connection | 15*1 | 2.4-4.5 |
| 30*1 | |||
| in parallel | 15*2 | 3-5 | |
| 30*2 | |||
| series connection | 15*1 | 3-5 | |
| 30*1 | |||
| in parallel | 15*2 | 3-6 | |
| 30*2 |
Rated insulation level: 0.5/3KV
The split-core epoxy resin structure allows fast installation without removing primary cables, reducing downtime in maintenance and retrofit projects. The design also improves mechanical stability and long-term insulation reliability in harsh electrical environments.
The device delivers stable measurement performance under low and high residual current conditions, making it suitable for protection systems in industrial distribution networks, substations, and compact switchgear assemblies.
1. Installation: Indoor use
2. Temperature range: -5℃ to 40℃, daily average ≤ 30℃
3. Environment: Non-corrosive, low pollution areas
Q1: What is the main function of a Zero Sequence Current Transformer?
A: It detects imbalance current caused by earth faults in three-phase systems and provides signals for relay protection systems to isolate faulty circuits.
Q2: Can it be installed without shutting down the system?
A: Yes, the split-core design allows installation around existing cables without disconnection.
Q3: Is the rated current fixed or customizable?
A: The primary current rating can be customized based on system requirements.
Q4: What type of protection systems is it compatible with?
A: It is compatible with earth fault relays, protection panels, and switchgear monitoring systems.
Q5: What materials are used in the core and winding?
A: It uses cold-rolled silicon steel cores and oxygen-free copper windings for low loss and high efficiency.
Q6: Where is it typically installed?
A: It is commonly installed in ring main units, distribution cabinets, transformers, and circuit breaker protection panels.
Address
Jinlu Industrial Zone, Beibaixiang Town, Yueqing City, Wenzhou City, Zhejiang Province, China
