Overview
The JDX6-35kV is an outdoor oil-immersed single-phase voltage transformer designed for 35kV high-voltage power systems. It utilizes an oil-immersed insulation system that ensures excellent thermal dissipation, making it suitable for continuous operation under heavy electrical loads.
Available in accuracy classes 0.2, 0.5, 1.0, and 6P, it supports applications ranging from precision metering to protective relaying. The JDX6-35 variant includes a residual voltage winding for ground fault detection, while the JD6-35 provides standard voltage transformation. Compliant with GB20840.3-2013 and IEC61869-3:2011 standards, it operates reliably in ambient temperatures from -5°C to +50°C and is rated for polluted environments (W1/W2 anti-pollution grades).
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System Voltage | 35kV |
| Primary Voltage | 35000V or 35000/√3 V |
| Secondary Voltage | 100V, 100/√3 V, or 100/3 V |
| Thermal Limit Output | 1000VA (JD6-35), 2×500VA (JDX6-35) |
| Accuracy Classes | 0.2, 0.5, 1.0, 6P |
| Insulation Type | Oil-immersed |
| Phase | Single-phase |
| Installation Location | Outdoor |
| Anti-Pollution Grade | W1 (Grade II), W2 (Grade III) |
| Operating Temperature | -5°C to +50°C |
| Standards | GB20840.3-2013, IEC61869-3:2011 |
| Residual Winding | Available in JDX6-35 only |
Model Designation
- J: Voltage transformer
- D: Single-phase design
- X: Indicates presence of residual (auxiliary) voltage winding for ground fault detection (absent in JD6-35)
- 6: Design series number
- 35: Rated system voltage of 35kV
Construction
The JDX6-35kV features a robust oil-immersed construction with a fully enclosed oil tank that prevents oxidation and aging of the insulating oil, significantly extending service life. The core and windings are immersed in high-quality transformer oil, which provides both electrical insulation and efficient heat dissipation during continuous high-load operation. The housing is made of corrosion-resistant steel with sealed bushings to maintain internal integrity under outdoor conditions. Anti-pollution porcelain or composite insulators (rated W1 or W2) ensure reliable performance in contaminated environments. All terminals are accessible from the top for safe and convenient connection, and the unit is designed for mounting on a concrete foundation with adequate clearance for maintenance.
Technical Parameters
Service Conditions
- Installation position: Outdoor substations, switching stations, or transmission networks
- Ambient temperature: -5°C to +50°C
- Altitude: ≤ 1000m (standard), higher altitude available on request
- Phase configuration: Single-phase (use three units for three-phase systems)
- Anti-pollution grade: W1 (Grade II) or W2 (Grade III)
- Enclosure: Fully enclosed oil box (prevents oil aging)
- Maintenance: Periodic oil testing and seal inspection required
Technical Parameters
The JDX6-35kV series comprises outdoor oil-immersed single-phase voltage transformers designed for 35kV systems. These units operate within an ambient temperature range of -5°C to +50°C, are rated for altitudes up to 1000m (with higher options available), and comply with GB20840.3-2013 and IEC61869-3:2011 standards.
| Type | Rated Voltage
(kV) |
Accuracy class /
Rated output (VA) |
Max.
output (VA) |
Rated
insulation (kV) |
|---|---|---|---|---|
| JDX6-35W/G | 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 |
| 35/√3:0.1/√3:0.1/√3:0.1/3 | 0.2/0.5/3P-30/40/100 | 2*500 | ||
| JDX6-35W/G(L) | 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 |
| 35/√3:0.1/√3:0.1/√3:0.1/3 | 0.2/0.5/3P-40/50/100 | 2*500 |
Installation & Wiring
Outline Dimensions
Overall dimensions vary by model. The transformer weighs approximately 69-85kg depending on configuration. It features a base plate with 4×M12 mounting bolt holes for secure installation. Minimum clearance of 600mm must be maintained on all sides to allow for maintenance access and oil sampling. High-voltage terminals are located at the top with M16 studs, while the secondary wiring is accessed through a terminal box at the bottom.
Selection & FAQs
Selection Guide
- Choose the correct model: Select JD6-35 for standard voltage measurement or JDX6-35 with residual voltage winding for ground fault detection and neutral point monitoring.
- Select appropriate accuracy class: Use class 0.2 for revenue metering, 0.5 for monitoring, 1.0 for general measurement, and 6P for protection applications.
- Match burden requirements: Ensure the rated output aligns with connected loads; thermal limit output is 1000VA for JD6-35 and single-residual JDX6-35, or 2×500VA for dual-residual JDX6-35.
- Verify environmental suitability: Confirm ambient temperature (-5°C to +50°C), altitude (≤1000m standard), and anti-pollution grade (W1 for moderate, W2 for heavy pollution) match your site conditions.
- Evaluate maintenance capabilities: Oil-immersed transformers require periodic oil testing and seal inspection—ensure your team can support this maintenance schedule.
Frequently Asked Questions
Q1: Which accuracy classes are available for this 35kV voltage transformer?
The JDX6-35/G offers 0.2, 0.5, and 1.0 classes for metering, plus 3P for protection. Rated outputs range from 50VA to 150VA depending on the class selected. Contact us to specify your exact secondary burden requirements.
Q2: Can this outdoor transformer operate at altitudes above 1000 meters?
Standard units are rated for altitudes up to 1000m. For higher elevations, derating or custom designs are available upon request. Please provide your exact site altitude for factory engineering confirmation.
Q3: How many units are needed for a three-phase 35kV system?
The JDX6-35/G is a single-phase unit. You must install three separate transformers to form a complete three-phase bank. Confirm your mounting layout with our engineering team before procurement.
Q4: What maintenance is required for the oil-immersed enclosure?
The fully enclosed oil box minimizes oil aging. However, periodic oil testing and seal inspections are required. Contact our service department for recommended maintenance schedules.
Q5: Which international standards does this 35kV VT comply with?
The JDX6-35/G series complies with GB20840.3-2013 and IEC61869-3:2011 standards. These certifications ensure reliable performance for outdoor transmission networks. Request the official type test report during your procurement process.
Q6: Are different anti-pollution grades available for coastal installations?
Yes, it is available in W1 (Grade II) or W2 (Grade III) anti-pollution grades. Specify your site’s environmental pollution level during inquiry. Our factory will confirm the correct bushing creepage distance.
Q7: What are the primary applications for the JDX6-35/G series?
This 35kV outdoor oil-immersed voltage transformer is designed for substations, switching stations, and transmission networks. It provides accurate voltage measurement and protection signals. Contact our sales team for application-specific technical support.