Overview
The JDXNF2-35W(G)(L) is a 35kV outdoor single-phase oil-immersed voltage transformer designed for high-voltage measurement in harsh environments. It features an oil-immersed insulation system that ensures superior thermal dissipation, enabling reliable operation under continuous heavy loads and extreme ambient conditions.
Available with accuracy classes of 0.2, 0.5, 1.0, and 3P, it supports applications ranging from precision metering to protective relaying. Configurations include standard or residual voltage windings for ground fault detection. Compliant with GB20840.3-2013 and IEC61869-3:2011, it operates reliably across temperatures from -40°C to +40°C and is rated for anti-pollution grades W (Grade II) and G (Grade III).
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System Voltage | 35 kV |
| Primary Voltage | 35/√3 kV |
| Secondary Voltages | 0.1/√3 kV, 0.1/3 kV (standard); additional 0.1/√3 kV (with residual winding) |
| Accuracy Classes | 0.2, 0.5, 1.0, 3P |
| Thermal Limit Output | 1000 VA (standard), 2×500 VA (dual residual winding) |
| Insulation Type | Oil-immersed |
| Phase | Single-phase |
| Installation Type | Outdoor |
| Anti-Pollution Grade | W (Grade II), G (Grade III) |
| Ambient Temperature Range | -40°C to +40°C |
| Secondary Outlet Options | Side outlet or top outlet (5/7 holes) |
| Standards | GB20840.3-2013, IEC61869-3:2011 |
Construction
The JDXNF2-35W(G)(L) features a robust oil-immersed construction with a fully enclosed oil tank that prevents oil oxidation and aging, significantly extending service life. The core and windings are immersed in high-quality insulating oil, which provides excellent dielectric strength and efficient heat transfer. The porcelain bushings are designed for outdoor use with enhanced creepage distance to meet anti-pollution requirements for grades W (II) and G (III). All external surfaces are treated for corrosion resistance, ensuring durability in humid, saline, or industrial atmospheres. The transformer includes either side-mounted or top-mounted secondary terminal boxes (5 or 7 holes) for flexible wiring connections, depending on the L designation. This design prioritizes long-term reliability, thermal stability, and minimal maintenance in demanding outdoor installations.
Technical Parameters
Service Conditions
- Installation position: Outdoor substations, switching stations, or transmission networks
- Ambient temperature: -40°C to +40°C
- Altitude: ≤ 1000m (standard), higher altitude available on request
- Insulation: Oil-immersed (superior thermal dissipation)
- Phase configuration: Single-phase (use three units for three-phase systems)
- Anti-pollution grade: W (Grade II) or G (Grade III)
- Enclosure: Fully enclosed oil box (prevents oil aging)
- Maintenance: Periodic oil testing and seal inspection required
Technical Parameters
The JDXNF2-35W(G)(L) series comprises outdoor oil-immersed single-phase voltage transformers rated for 35kV systems. Designed for operation in ambient temperatures from -40°C to +40°C and altitudes up to 1000m, these units comply with GB20840.3-2013 and IEC61869-3:2011 standards.
Model Variants
| Model | Rated Voltage Ratio (kV) |
Accuracy Class & Rated Output (VA) |
Thermal Limit Output (VA) |
Rated Insulation Level (kV) |
|---|---|---|---|---|
| JDXNF2-35W(G) (Standard) |
35/√3 : 0.1/√3 : 0.1/3 | 0.2/3P: 50/100 0.5/3P: 100/100 1.0/3P: 150/100 |
1000 | 40.5/80/185 |
| JDXNF2-35W(G) (With residual winding) |
35/√3 : 0.1/√3 : 0.1/√3 : 0.1/3 | 0.2/0.5/3P: 30/40/100 | 2×500 | 40.5/80/185 |
| JDXNF2-35W(G)(L) (Enhanced) |
35/√3 : 0.1/√3 : 0.1/3 | 0.2/3P: 75/100 0.5/3P: 150/100 1.0/3P: 200/100 |
1000 | 40.5/80/185 |
| JDXNF2-35W(G)(L) (Enhanced with residual) |
35/√3 : 0.1/√3 : 0.1/√3 : 0.1/3 | 0.2/0.5/3P: 40/50/100 | 2×500 | 40.5/80/185 |
Note 2: JDXNF2-35W(G) with residual winding – Includes residual voltage winding for ground fault detection and neutral point monitoring.
Note 3: JDXNF2-35W(G)(L) – Enhanced configuration with higher rated output for heavy-load applications.
Note 4: JDXNF2-35W(G)(L) with residual winding – Enhanced configuration with dual residual windings for redundant ground fault detection.
Note 5: Anti-pollution grades: W (Grade II) for moderate pollution, G (Grade III) for heavy pollution.
Note 6: Rated output and its relative accuracy class only one alternative per transformer.
Note 7: If user’s data go beyond the above-mentioned scopes, they may be subject to an agreement between manufacturer and purchaser.
Installation & Wiring
Outline Dimensions
Overall dimensions vary by configuration and secondary outlet type. Standard configuration: Height 1085±5mm, Base width 408mm, Box width 368mm. Secondary outlet options include side outlet (standard) or top outlet (5 holes or 7 holes). Mounting is provided via 4×M12 bolts on the base plate.
Wiring Diagram
The JDXNF2-35W(G)(L) supports multiple wiring configurations: Y/Y/Δ connection (four windings) for comprehensive metering and protection, or Y/Δ connection (three windings) for standard voltage transformation. Primary terminals A and N connect to the 35kV system. Secondary outputs include 1a1n, 2a2n, and 3a3n for metering and protection circuits, with da/dn provided for open-delta ground fault detection. Ensure correct polarity and phase sequence during installation to maintain accuracy and system integrity.
Selection & FAQs
Selection Guide
- Choose the right model: Select JDXNF2-35W(G) for standard applications or JDXNF2-35W(G)(L) for higher rated output; include a residual voltage winding if ground fault detection is needed.
- Match accuracy class to application: Use 0.2 for revenue metering, 0.5 for monitoring, 1.0 for general measurement, and 3P for protection circuits.
- Verify burden compatibility: Ensure the transformer’s rated output aligns with connected loads—standard models support up to 1000VA thermal limit, while residual-winding models support 2×500VA.
- Confirm environmental suitability: Check that ambient temperature (-40°C to +40°C), altitude (≤1000m standard), and anti-pollution grade (W for moderate, G for heavy pollution) match your site conditions.
- Select appropriate secondary outlet: Choose side outlet (standard) or top outlet (5-hole or 7-hole) based on cable routing and installation space constraints.
Frequently Asked Questions
Q1: Which anti-pollution grade is best for coastal substations?
Choose the ‘G’ variant for Grade III anti-pollution requirements. It provides enhanced insulation for harsh coastal environments. Confirm specific site conditions with our engineering team.
Q2: Can a single unit be used for three-phase measurement systems?
Yes, three identical single-phase units are required to form a complete three-phase system. This configuration ensures accurate voltage transformation and phase isolation. Contact us for three-phase mounting accessory details.
Q3: What accuracy class is suitable for protective relaying?
The 3P accuracy class is designed for protection circuits. It ensures reliable performance up to the 1000VA thermal limit output during fault conditions. Specify your exact burden requirements during ordering.
Q4: Does this 35kV transformer meet international IEC standards?
Yes, it fully complies with IEC 61869-3:2011 and GB20840.3-2013 standards. Routine factory test reports are provided to verify compliance. Request specific certification documents during the inquiry stage.
Q5: Can the transformer be customized for high-altitude installations above 1000m?
Yes, higher altitude configurations are available upon request. Standard units are rated up to 1000m, but custom designs ensure proper insulation at elevated sites. Provide exact site elevation for factory evaluation.
Q6: Where is this 35kV outdoor voltage transformer typically applied?
It is primarily used for voltage measurement and protection in outdoor 35kV substations and transmission networks. The fully enclosed oil box prevents oil aging in harsh weather. Contact sales for application-specific recommendations.
Q7: How should the oil-immersed enclosure be maintained?
Periodic oil testing and seal inspections are required to maintain optimal performance. The fully enclosed design significantly minimizes oil aging and contamination. Consult the operation manual for detailed maintenance intervals.