Overview
The JDZXW12-35R is a single-phase outdoor voltage transformer rated for 35kV systems, featuring epoxy cast-resin insulation. This design eliminates oil maintenance and provides robust resistance to UV exposure, moisture, and pollution, ensuring reliable operation in harsh outdoor environments.
It supports accuracy classes of 0.2, 0.5, and 1.0, with thermal limit output up to 600VA, making it suitable for metering, protection, and ground-fault detection in substations, renewable energy installations, and industrial distribution networks. The unit complies with GB20840.3-2013 and IEC61869-3:2011 standards and operates reliably across temperatures from -5°C to +50°C.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System Voltage | 35kV |
| Insulation Type | Epoxy cast-resin |
| Primary Voltage | 35/√3 kV |
| Secondary Voltages | 100/√3 V, 100 V (configurable) |
| Accuracy Classes | 0.2, 0.5, 1.0, 6P |
| Thermal Limit Output | 600VA |
| Fuse Rating | 0.5/1A (Φ25×400 mm) |
| Winding Configurations | 3-winding (Y/△), 4-winding (Y/Y/△) |
| Operating Temperature | -5°C to +50°C |
| Mounting | Outdoor, concrete foundation |
| Protection | Integrated fuse (M45×1.5 copper caps) |
| Standards | GB20840.3-2013, IEC61869-3:2011 |
Construction
The JDZXW12-35R features a monolithic epoxy cast-resin body that fully encapsulates the magnetic core and windings, providing a solid, void-free insulation structure. This construction offers excellent dielectric strength, tracking resistance, and mechanical stability without the need for oil or gas filling. The resin formulation includes UV stabilizers and hydrophobic additives to resist surface degradation from sunlight, salt spray, and industrial contaminants. All high-voltage terminals are integrated into the cast body with embedded copper inserts (M45×1.5 thread) for secure fuse mounting. The secondary terminals are housed in a sealed terminal box with IP54 protection, ensuring reliable connection integrity in wet and dusty conditions. The compact, self-supporting design requires no external housing or maintenance throughout its service life.
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: Epoxy cast-resin (maintenance-free)
- Frequency: 50Hz or 60Hz
- Phase configuration: Single-phase (use three units for three-phase systems)
- Pollution grade: Grade II-IV (suitable for coastal and industrial areas)
Technical Parameters
The JDZXW12-35R is a 35kV outdoor epoxy cast-resin single-phase voltage transformer with integrated fuse protection. 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 ratio(V) | Accuracy classes | Rated
Output(VA) |
Thermal limit
output(VA) |
|---|---|---|---|---|
| JDZXW12-35R | 33/√3 : 0.11/√3 35/√3 : 0.1/√3 : 0.1/√3 |
0.2/6P(3P) | 45/100 | 600 |
| 0.5/6P(3P) | 100/100 | |||
| 1.0/6P(3P) | 200/100 | |||
| 35/√3 : 0.1/√3 : 0.1/√3 : 0.1/3 | 0.2/0.2/6P(3P) | 20:20/100 | 600 corresponding to 0.2 class |
|
| 0.2/0.5/6P(3P) | 20:30/100 | |||
| 0.5/0.5/6P(3P) | 40:40/100 |
Installation & Wiring
Outline Dimensions
Overall height: 875±10mm. Base width: 403mm (inner width 310mm). Base depth: 280mm (inner depth 250mm). Weight: approximately 71kg. The unit features four M6 mounting holes on the base plate. Maintain a minimum clearance of 600mm on all sides for maintenance access.
Wiring Diagram
The JDZXW12-35R supports both three-winding and four-winding configurations. Primary terminals A, B, C are connected in a star configuration with neutral N. For metering, secondary terminals a, b, c form a star connection. An open-delta winding (da/dn) is provided for ground fault detection. In the four-winding version, an additional protection winding (2a, 2b, 2c with neutral 2n) is available. Integrated fuse protection uses M45×1.5 copper caps with Φ25×400 fuse tubes rated at 0.5/1A.
Selection & FAQs
Selection Guide
- Winding Configuration: Select three-winding (Y/△) for basic metering and protection, or four-winding (Y/Y/△) for dual secondary outputs and ground fault detection
- Accuracy Class: Use 0.2 for revenue metering, 0.5 for monitoring, 1.0 for general measurement, and 6P(3P) for protection applications
- Burden Matching: Ensure the rated output aligns with connected loads; thermal limit output is 600VA for both configurations
- Environmental Suitability: Confirm ambient temperature (-5°C to +50°C), altitude (≤1000m standard), and pollution grade match site conditions
- Maintenance Strategy: Epoxy cast-resin design requires minimal maintenance—ideal for locations where oil testing or seal inspections are impractical
- Space and Weight Constraints: Compact size (875mm height, 71kg) enables installation in tight spaces with reduced foundation requirements
Frequently Asked Questions
Q1: Can this 35kV voltage transformer be installed indoors?
No, the JDZXW12-35R is designed for outdoor substations and switching stations. It features epoxy cast-resin insulation rated for pollution grades II-IV. Contact us to select an appropriate indoor model.
Q2: Which accuracy class is suitable for protection relays?
The 6P or 3P accuracy classes are suitable for protection applications. These classes ensure reliable performance during fault conditions up to the 600VA thermal limit. Confirm your specific relay burden with our engineering team.
Q3: How many units are needed for a three-phase system?
You need three single-phase units to form a complete three-phase system. The JDZXW12-35R operates as a single-phase transformer with integrated fuse protection. Ensure proper phase configuration during installation.
Q4: What international standards does this transformer comply with?
The JDZXW12-35R complies with IEC61869-3:2011 and GB20840.3-2013 standards. It is a 35kV outdoor epoxy cast-resin single-phase voltage transformer. Request the full type test report for your project documentation.
Q5: Are higher altitude versions available for this transformer?
Standard models are rated for altitudes up to 1000m. Higher altitude versions are available upon request to ensure proper dielectric strength. Specify your exact site elevation for factory customization.
Q6: Why choose epoxy cast-resin insulation for this model?
Epoxy cast-resin provides maintenance-free, weather-resistant insulation suitable for pollution grades II-IV. It ensures reliable outdoor performance in coastal and industrial areas. Request material certificates for your specific project requirements.
Q7: What is the thermal limit output for this transformer?
The thermal limit output is rated at 600VA. This capacity ensures stable operation during temporary overvoltage and fault conditions. Verify your secondary circuit burden to prevent thermal overload.
Q8: Where is this 35kV voltage transformer typically applied?
It is primarily applied in outdoor substations, switching stations, and transmission networks. The single-phase design requires three units for three-phase metering or protection systems. Contact us for application engineering support.