Overview
The JDZX9-35G/210 is a single-phase indoor epoxy cast-resin voltage transformer rated for 35kV medium-voltage systems. It utilizes advanced epoxy resin cast insulation technology, ensuring high dielectric strength and maintenance-free operation in indoor environments.
This transformer supports multiple accuracy classes (0.2, 0.5, 1.0) and features a Y/△ winding configuration with an open-delta residual winding for ground fault detection. It is suitable for energy metering, voltage monitoring, and relay protection applications in compliance with standard insulation levels of 40.5/80/185kV and offers a thermal limit output of up to 600VA.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System Voltage | 35kV |
| Insulation Level | 40.5/80/185kV |
| Accuracy Classes | 0.2, 0.5, 1.0 |
| Thermal Limit Output | 600VA |
| Winding Configuration | Y/△ with open-delta residual |
| Phase | Single-phase |
| Installation Type | Indoor |
| Insulation Material | Epoxy cast-resin |
| Weight | 42.15kg |
Construction
The JDZX9-35G/210 features a robust epoxy cast-resin construction with a tiered insulator structure that enhances creepage distance and surface tracking resistance. The dark brown resin housing provides excellent electrical insulation and mechanical strength, meeting the 40.5/80/185kV insulation level requirements. A clear terminal box protects secondary connections while allowing visual inspection, and a metal base plate ensures secure mounting within indoor switchgear assemblies. The design eliminates the need for oil or gas insulation, resulting in a maintenance-free, fire-resistant unit suitable for long-term indoor operation.
Technical Parameters
Service Conditions
- Installation position: Indoor switchgear, substations, or distribution points
- Ambient temperature: -5°C to +40°C
- Altitude: ≤ 1000m (standard), higher altitude available on request
- Insulation: Epoxy resin cast
- Frequency: 50Hz or 60Hz
- Connection: Single-phase (three units for three-phase system)
- Maintenance: Minimal maintenance required (epoxy resin design)
Technical Parameters
The JDZX9-35G/210 is a 35kV indoor epoxy cast-resin single-phase voltage transformer designed for operation in ambient temperatures from -5°C to +40°C and standard altitudes up to 1000m. It complies with GB1207-2006 and IEC60044-2:2003 standards and supports both 50Hz and 60Hz systems.
| Rated Voltage (kV) | Rated
insulation (kV) |
Accuracy class /
Rated output (VA) |
Max.
output (VA) |
|---|---|---|---|
| 35/√3 : 0.1/√3 : 0.1/3 | 40.5/80/185 | 0.5/3(6)P 60/100 0.2/3(6)P 30/100 1/3(6)P 100/100 |
600 |
| 35/√3 : 0.1/√3 : 0.1/√3 : 0.1/3 | 0.2/0.5/3(6)P 15/20/100 0.5/0.5/3(6)P 30/30/100 |
Warning: Power frequency withstand voltage test cannot be performed between primary and secondary or secondary to ground; only induction withstand voltage test is allowed.
Note: Rated output and its relative accuracy class only one alternative. 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: 320mm (top width) × 420mm (base width) × 300mm (height). Creepage distance: 710mm. Weight: approximately 42.15kg. Mounting holes: M6 and M10 on base plate. Ground terminal: M8.
Wiring Diagram
Y/△ Connection (Three-Winding) – Primary terminals A, B, C are connected in a star configuration. Secondary outputs a, b, c are used for metering circuits, while da/dn terminals provide open-delta connection for ground fault detection.
Selection & FAQs
Selection Guide
- Accuracy Class: Select class 0.2 for revenue metering, 0.5 for monitoring, 1.0 for general measurement, or 3(6)P for protection applications.
- Winding Configuration: Choose three-winding (Y/△) for basic metering and protection, or five-winding for dual secondary outputs and enhanced redundancy.
- Burden Matching: Ensure the rated output (e.g., 30/100VA) aligns with the connected load to maintain specified accuracy.
- Environmental Suitability: Confirm ambient temperature (-5°C to +40°C) and altitude (≤1000m standard) match your indoor installation site.
- Voltage Ratio: Specify the required ratio (e.g., 35/√3 / 0.1/√3 / 0.1/3 kV) based on system and metering needs.
Frequently Asked Questions
Q1: Can this 35kV voltage transformer be installed outdoors?
No, it is strictly designed for indoor installation. It should be mounted in indoor switchgear, substations, or distribution points. Contact us for outdoor-specific models.
Q2: Which accuracy class is suitable for protective relaying?
Select the 3(6)P accuracy class for protection applications. It ensures reliable performance during fault conditions with a rated output up to 100 VA. Confirm exact burden requirements with our engineering team.
Q3: Can the operating altitude exceed the standard 1000m limit?
Yes, higher altitude configurations are available upon request. Standard models are rated for altitudes up to 1000m. Please specify your exact site altitude during the inquiry for factory verification.
Q4: How does this voltage transformer handle different power frequencies?
It supports both 50Hz and 60Hz systems seamlessly. The design complies with IEC60044-2:2003 standards for reliable operation. Specify your grid frequency during the initial inquiry.
Q5: What maintenance is required for the epoxy resin insulation?
Minimal maintenance is required due to the fully cast epoxy resin design. This construction provides excellent insulation and prevents moisture ingress. Contact our team for specific maintenance guidelines.
Q6: Are international certifications provided for this 35kV potential transformer?
Yes, it complies with IEC60044-2:2003 and GB1207-2006 standards. These ensure global compatibility for indoor measurement applications. Request the factory test report for detailed compliance documentation.