Overview
The JDZX16-35W is a single-phase outdoor voltage transformer rated for 35kV systems, featuring an epoxy cast-resin insulation system. This design eliminates oil maintenance and provides robust resistance to UV exposure, moisture, and pollution, making it suitable for long-term outdoor operation in harsh environments.
It offers multiple winding configurations (three-winding Y/△ or four-winding Y/Y/△) and accuracy classes of 0.2, 0.5, or 1.0 to support metering, protection, and ground fault detection. With a thermal burden capacity up to 600VA and compliance with GB20840.3-2013 and IEC60044-2:2003 standards, it is ideal for outdoor substations, transmission networks, and renewable energy installations.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System Voltage | 35 kV |
| Rated Primary Voltage | 35 / √3 kV |
| Secondary Voltages | 100 / √3 V, 100 V (configurable) |
| Accuracy Classes | 0.2, 0.5, 1.0, 6P |
| Thermal Burden Limit | 600 VA |
| Insulation Level | 40.5 / 95 / 200 kV |
| Frequency | 50 Hz |
| Phase | Single-phase |
| Winding Configurations | 3-winding (Y/△), 4-winding (Y/Y/△) |
| Operating Temperature | -5°C to +50°C |
| Standards | GB20840.3-2013, IEC60044-2:2003 |
| Type | Outdoor, epoxy cast-resin |
Construction
The JDZX16-35W features a fully encapsulated epoxy cast-resin construction, providing a solid, non-hygroscopic insulation system that is impervious to moisture ingress and resistant to surface tracking under pollution conditions. The core and windings are vacuum-cast in high-grade epoxy resin with inorganic fillers, ensuring excellent mechanical strength, thermal stability, and dielectric performance. The outdoor housing includes optimized creepage distance and hydrophobic surface properties to withstand salt spray, industrial contamination, and UV radiation without degradation. All external hardware is corrosion-resistant, and the unit requires no oil, gas, or periodic insulation 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
- Phase configuration: Single-phase (use three units for three-phase systems)
- Pollution grade: Grade II-IV (suitable for coastal and industrial areas)
- UV resistance: Excellent (epoxy resin provides UV protection)
- Moisture protection: Complete moisture barrier (epoxy construction)
Technical Parameters
The JDZX16-35W is a 35kV outdoor single-phase voltage transformer with epoxy cast-resin insulation, designed for operation in ambient temperatures from -5°C to +50°C and standard altitudes up to 1000m. It complies with GB20840.3-2013 and IEC60044-2:2003 standards and supports both 50Hz and 60Hz system frequencies.
| Type | Rated ratio(V) | Accuracy classes | Rated Output(VA) | Thermal limit
output(VA) |
|---|---|---|---|---|
| JDZX16-35W | 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 | ||
| 0.2/0.5/6P(3P) | 20:30/100 | 600 corresponding to 0.2 class |
||
| 0.5/0.5/6P(3P) | 40:40/100 |
Installation & Wiring
Outline Dimensions
Overall dimensions: Height 677mm, base width 350mm, base depth 310mm. Weight: approximately 53.2kg. Mounting: 4×M10 mounting holes on base plate. Minimum clearance of 500mm required around the transformer for maintenance access.
Wiring Diagram
The JDZX16-35W supports both three-winding and four-winding configurations. In the three-winding version, primary terminals A, B, C are connected in a star configuration with neutral N. Secondary outputs a, b, c provide metering signals (star-connected), while da/dn form an open-delta connection for ground fault detection. The four-winding variant adds a second set of secondary outputs—2a, 2b, 2c—with neutral 2n dedicated to protection circuits.
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 class 0.2 for revenue metering, 0.5 for monitoring, 1.0 for general measurement, and 6P(3P) for protection applications
- Burden Compatibility: Match rated output to 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 align with site conditions
- Installation Constraints: Leverage compact size (677mm height, 53.2kg weight) for space-limited or lightweight foundation installations
Frequently Asked Questions
Q1: Can this 35kV voltage transformer be installed in coastal areas?
Yes, it is suitable for coastal environments. The epoxy cast-resin insulation provides complete moisture protection and supports pollution grades II-IV. Please confirm specific coastal salinity levels with our engineering team.
Q2: Which accuracy class is recommended for 35kV metering applications?
Select the 0.2 class for high-precision metering. It supports a rated output of 45VA with a thermal limit of 600VA. Contact us to verify the exact ratio requirements for your project.
Q3: How many units are needed for a three-phase 35kV system?
Three single-phase units are required for three-phase systems. The JDZX16-35W is designed as a single-phase transformer for outdoor substations. Specify your three-phase connection requirements during the ordering process.
Q4: What is the maximum operating altitude for this cast-resin transformer?
The standard maximum altitude is 1000m. For installations above 1000m, derating or custom design adjustments are necessary. Submit your exact site altitude for factory technical evaluation.
Q5: Are these 35kV outdoor transformers compliant with IEC standards?
Yes, they comply with IEC60044-2:2003 and GB20840.3-2013 standards. The units support both 50Hz and 60Hz system frequencies. Request the specific type test certificates for your regional compliance requirements.
Q6: When can custom voltage ratios be requested for this transformer?
Custom ratios are available subject to technical confirmation. The standard ratio is 35/√3 : 0.1/√3 : 0.1/3. Provide your exact primary and secondary voltage requirements for factory quotation.
Q7: Why specify this JDZX16-35W for outdoor switching stations?
It is ideal for harsh industrial and coastal environments. The UV-resistant epoxy construction ensures reliable performance in outdoor switching stations. Contact our sales team for regional distribution details.