Overview
The JD6-35 is a 35kV outdoor single-phase oil-immersed voltage transformer designed for high-voltage measurement applications. It features a 35000/100V transformation ratio and utilizes mineral oil as both insulation and cooling medium, providing excellent thermal dissipation for continuous operation under heavy electrical loads.
With accuracy classes of 0.2, 0.5, and 1.0, the JD6-35 supports precision metering and protective relaying functions in accordance with IEC and GB standards. Its robust design meets insulation levels of 40.5/95/200kV and includes anti-pollution grades W1 (Grade II) and W2 (Grade III), making it suitable for moderately to heavily polluted outdoor environments such as substations, transmission networks, and industrial power systems.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| Primary Voltage | 35000 V |
| Secondary Voltage | 100 V |
| System Voltage Class | 35 kV |
| Insulation Level (Um/Ur/Ud) | 40.5/95/200 kV |
| Accuracy Classes | 0.2 / 0.5 / 1.0 |
| Thermal Limit Output | 1000 VA |
| Phase Configuration | Single-phase |
| Insulation Type | Oil-immersed |
| Pollution Severity Grades | W1 (II), W2 (III) |
| Ambient Temperature Range | -5°C to +50°C |
| Installation Type | Outdoor |
| Cooling Method | Natural convection (ONAN) |
Construction
The JD6-35 features a fully enclosed oil-filled tank constructed from welded steel plates, ensuring long-term oil tightness and protection against environmental exposure. The core and windings are immersed in high-quality insulating oil that provides both dielectric strength and efficient heat transfer. Porcelain bushings rated for 40.5kV are used for primary and secondary terminals, offering reliable insulation and mechanical support. The oil expansion chamber accommodates thermal volume changes while minimizing contact with air, reducing oil oxidation and aging. All external surfaces are treated with anti-corrosion coatings suitable for outdoor service, and the unit includes provisions for grounding, oil sampling, and pressure relief. This construction ensures stable performance under continuous load, wide temperature variations, and polluted conditions typical of outdoor high-voltage installations.
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
- Insulation: Oil-immersed (superior thermal dissipation)
- Frequency: 50Hz or 60Hz
- 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 JD6-35 is a 35kV outdoor oil-immersed single-phase voltage transformer designed for metering and protection applications. It operates within an ambient temperature range of -5°C to +50°C, up to 1000m altitude, and complies with GB20840.3-2013 and IEC61869-3:2011 standards.
| Type | Rated voltage ratio(V) | Rated output(VA) | Limit
output(VA) |
|||
|---|---|---|---|---|---|---|
| 0.2 | 0.5 | 1 | 6P | |||
| JD6-35 | 35000/100 | 75 | 150 | 250 | 1000 | |
| JDX6-35 | 35000/√3:100/√3:100/3 | 75 | 150 | 250 | 100 | 1000 |
| 35000/√3:100/√3:100/√3:100/3 | 30 | 60 | 100 | 2×500 | ||
Installation & Wiring
Outline Dimensions
Overall dimensions vary by configuration. Type 1 (V-shape dual-bushing): Height 1142±20mm, Width 970±15mm, Weight 143kg (oil 29kg). Type 2 (single vertical bushing): Height 1285±20mm, Width 490mm, Weight 126kg (oil 24kg). Mounting is provided via 4×M12 bolts on the base plate. Minimum clearance of 600mm must be maintained around the unit for maintenance access and oil sampling.
Selection & FAQs
Selection Guide
- Accuracy Class: Select class 0.2 for revenue metering, 0.5 for monitoring, or 1.0 for general measurement applications.
- Burden Matching: Ensure the rated output (e.g., 75VA, 150VA, 250VA) aligns with connected loads; thermal limit output is 1000VA.
- Environmental Suitability: Confirm ambient temperature (-5°C to +50°C), altitude (≤1000m standard), and anti-pollution grade (W1 for moderate, W2 for heavy pollution).
- Maintenance Readiness: Oil-immersed design requires periodic oil testing and seal inspection—verify alignment with your maintenance capabilities.
- Thermal Performance Needs: Choose oil-immersed over cast-resin types for superior heat dissipation under continuous heavy-load conditions.
- Ground Fault Detection: If required, opt for the JDX6-35 model with a residual voltage winding instead of the standard JD6-35.
Frequently Asked Questions
Q1: Can this single-phase 35kV PT be used in three-phase systems?
Yes, use three units to form a three-phase bank for 35kV outdoor substations. Ensure proper phase configuration during installation. Contact us for wiring diagrams.
Q2: What is the maximum operating altitude for this oil-immersed transformer?
Standard installation supports altitudes up to 1000m. For higher altitudes, derating or custom design is required subject to factory confirmation. Specify your exact site altitude during inquiry.
Q3: Which accuracy class is suitable for revenue metering at 35kV?
Select the 0.2 accuracy class, offering 75VA rated output for precise metering. Higher outputs like 150VA or 300VA are available for protection classes.
Q4: Does this 35kV voltage transformer comply with international IEC standards?
Yes, it complies with IEC61869-3:2011 and GB20840.3-2013 standards for outdoor instrument transformers. Factory test reports are provided upon request. Provide your specific certification requirements.
Q5: What factory tests are performed before shipping the JD6-35 PT?
Routine tests including ratio, polarity, and insulation resistance are conducted per IEC61869-3. Special type tests are available subject to prior agreement. Request the standard test checklist for details.
Q6: Where are these 35kV outdoor oil-immersed PTs typically installed?
They are designed for outdoor substations, switching stations, and transmission networks up to 35kV. The fully enclosed oil box prevents aging in harsh environments.
Q7: How does the anti-pollution design handle severe outdoor environments?
It features W1 (Grade II) or W2 (Grade III) anti-pollution grades for contaminated areas. The fully enclosed oil tank ensures superior thermal dissipation and prevents oil aging. Specify your site pollution level.