JLSZ Outdoor Epoxy Resin Combined Instrument Transformer
2026-03-02
Product Overview
The JLSZ outdoor epoxy resin combined instrument transformer integrates both current transformer (CT) and voltage transformer (VT) functions in a single compact unit designed for outdoor installation in 35kV power systems.
Key Features
- Combined CT and VT in single housing
- Epoxy resin cast insulation for superior outdoor performance
- High accuracy class for both measurement and protection
- Compact design saves space and reduces installation costs
- Excellent pollution resistance and weather protection
- Complies with IEC 61869 and GB20840 standards
Technical Specifications
| Current Transformer (CT) | |
|---|---|
| Primary Current | 50-1250A |
| Secondary Current | 1A or 5A |
| Accuracy Class (Measurement) | 0.2S, 0.5S |
| Accuracy Class (Protection) | 5P10, 5P15, 5P20 |
| Burden | 5-30VA |
| Voltage Transformer (VT) | |
|---|---|
| Primary Voltage | 35/√3 kV |
| Secondary Voltage | 100/√3 V |
| Accuracy Class | 0.2, 0.5 |
| Burden | 10-50VA |
Standards Compliance
- IEC 61869 (Instrument Transformers)
- GB20840 (Chinese National Standard)
- IEC 60815 (Pollution Performance)
- DL/T 866 (Current Transformer Selection Guide)
Service Conditions
- Altitude: ≤ 1000m above sea level
- Ambient Temperature: -40°C to +40°C
- Relative Humidity: ≤ 95%
- Pollution Degree: III (Heavy Pollution)
- Installation: Outdoor, vertical mounting
Construction Details
The JLSZ transformer features a robust epoxy resin cast body that provides excellent mechanical strength and electrical insulation properties. The combined design eliminates the need for separate CT and VT installations, reducing space requirements and simplifying wiring connections.
Applications
- 35kV outdoor switchgear and substations
- Power distribution networks
- Industrial power systems
- Railway electrification systems
- Renewable energy integration points
Ordering Information
When ordering, please specify:
- Model designation (JLSZV-35 or JLSZW-35)
- Primary current rating
- Secondary current rating (1A or 5A)
- Accuracy classes required
- Burden requirements
- Special environmental conditions
Frequently Asked Questions
JLSZV models are standard versions while JLSZW models include additional weather-resistant features for harsh outdoor environments.
Yes, we can provide custom accuracy classes based on your specific application requirements. Please consult our technical team for available options.
The expected service life is typically 20-25 years under normal operating conditions with proper maintenance.
The transformer should be installed vertically with proper grounding. Ensure adequate clearance around the unit for ventilation and maintenance access.
Each unit undergoes comprehensive testing including ratio accuracy, polarity verification, insulation resistance, power frequency withstand voltage, and partial discharge tests.
For altitudes above 1000m, special design modifications are required to maintain insulation performance. Please specify your altitude requirements when ordering.
Standard warranty is 24 months from date of commissioning or 30 months from date of shipment, whichever comes first.
Contact our technical support team at support@duomatech.com with your product serial number and detailed description of your inquiry.
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