Overview
The LZZW-20 and LZZW-24 are outdoor single-phase epoxy resin cast current transformers for 20kV and 24kV AC power systems (50/60Hz). These transformers provide precise current measurement for metering and protective relays, ensuring reliable operation of power systems. The cast-resin design offers safe, fully enclosed operation without leakage or fire hazards, suitable for harsh outdoor conditions.
Applications include power system monitoring, over-current, over-voltage, overload, and single-phase grounding protection.
Key Features
- IEC 61869-1, IEC 61869-2 compliant
- High-quality epoxy resin insulation, low partial discharge, high accuracy
- Anti-pollution and moisture resistant, suitable for outdoor use
- Seismic and mechanical shock resistant
- Compact pillar-type structure, easy installation
- Optional multi-ratio secondary windings
- Wide operating temperature: -45°C ~ +45°C
Technical Data
| Rated
Primary Current (A) |
Accuracy
Class |
Rated
Output (VA) |
Short-Time
Thermal Current (kA/1s) |
Rated
Dynamic Current (kA) |
|---|---|---|---|---|
| 10–200 | 0.2/0.5/10P10 | 10/15/15 | 150 | 375 |
| 300–500 | 0.2/0.5/10P | 15 | 40 | 100 |
| 600–1000 | 0.2/0.5/10P | 15/20/20 | 80 | 200 |
| 1000–2000 | 0.2/0.5/10P | 30/30/50 | 100 | 250 |
Installation Safety
- Install with grounding bolts and four mounting holes
- Outdoor operation with no leakage, no pressure, no fire risk
- Supports ambient temperatures -45°C ~ +45°C
- Anti-fouling and anti-fogging design suitable for tropical or polluted environments
- Compliance with high-voltage outdoor insulation and safety standards
Model Explanation
- LZZW-20 / LZZW-24 – Series name
- Pillar-type – Structure
- Epoxy Resin Cast – Insulation technology
- Outdoor – Intended use
- Rated voltage: 20kV / 24kV
Applications
- Power Substations – Accurate current measurement for protective relays
- Renewable Energy Systems – Monitoring and protection in solar/wind installations
- Industrial Facilities – Overload and short-circuit monitoring
- Energy Metering – Precise metering for billing and consumption monitoring
FAQs
- Q: Can LZZW-20 / LZZW-24 be installed in outdoor harsh environments?
A: Yes, the epoxy resin and silicone rubber sheds protect against moisture, UV, and pollution. - Q: What is the rated secondary current?
A: Standard 5A, 1A available upon request. - Q: Are these transformers maintenance-free?
A: Yes, no intermediate maintenance is required. Regular surface cleaning is sufficient. - Q: What standards do they comply with?
A: IEC 61869-1, IEC 61869-2, GB20840.2-2014