Overview
The JDZX9-35W is a 35kV outdoor single-phase voltage transformer with epoxy cast-resin insulation, designed for high-voltage measurement in polluted environments. It features an extended creepage distance of 1327mm to enhance pollution flashover resistance, making it suitable for coastal, industrial, and high-humidity locations.
Available in accuracy classes 0.2, 0.5, and 1.0, it supports three-winding (Y/△) or four-winding (Y/Y/△) configurations for metering and protection applications. With a thermal limit output of up to 600VA, it complies with GB20840.3-2013 and IEC61869-3:2011 standards and operates reliably between -5°C and +50°C.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System Voltage | 35kV |
| Insulation Level | 40.5/95/185kV |
| Creepage Distance | 1327mm |
| Accuracy Classes | 0.2 / 0.5 / 1.0 |
| Secondary Windings | 3 or 4 |
| Thermal Limit Output | 600VA |
| Phase | Single-phase |
| Installation Type | Outdoor |
| Insulation Material | Epoxy cast-resin |
| Operating Temperature | -5°C to +50°C |
| Standards | GB20840.3-2013, IEC61869-3:2011 |
Construction
The JDZX9-35W features a robust epoxy cast-resin insulation system that encapsulates all active components, providing excellent resistance to moisture, UV radiation, and chemical pollutants. The solid dielectric construction eliminates the need for oil filling, seals, or periodic maintenance such as oil testing or gasket inspection. The housing is molded with deep ribs and sheds to achieve the extended creepage distance of 1327mm, critical for preventing surface flashover in contaminated environments. All external surfaces are formulated for long-term outdoor exposure, ensuring dimensional stability and electrical integrity under thermal cycling and environmental stress. The design includes integrated mounting provisions for secure foundation installation and proper grounding, while maintaining safe clearance for operational access.
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 III-IV (suitable for heavily polluted industrial and coastal areas)
- UV resistance: Excellent (epoxy resin provides UV protection)
- Moisture protection: Complete moisture barrier (epoxy construction)
Technical Parameters
The JDZX9-35W is a 35kV outdoor epoxy cast-resin single-phase voltage transformer 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 IEC61869-3:2011 standards, featuring extended creepage distance and dual or triple secondary windings for metering, protection, and ground fault detection.
Model Variants
| Model | Rated Voltage (kV) |
Accuracy Class & Rated Output (VA) |
Thermal Limit Output (VA) |
Rated Insulation Level (kV) |
|---|---|---|---|---|
| JDZX9-35W (Three-winding) |
35/√3 / 0.1/√3 / 0.1/3 | 0.2/6P(3P): 45/100 0.5/6P(3P): 100/100 1.0/6P(3P): 200/100 |
600 | 40.5/95/200 |
| JDZX9-35W (Four-winding) |
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 0.5/0.5/6P(3P): 40/40/100 |
600 | 40.5/95/200 |
Note 2: Four-winding configuration (35/√3 / 0.1/√3 / 0.1/√3 / 0.1/3) – Enhanced configuration with dual secondary outputs for separate metering and protection circuits.
Note 3: Rated output and its relative accuracy class only one alternative per transformer.
Note 4: 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 height: 695±5mm, base width: 385mm, base depth: 310mm. Weight: approximately 69kg. Mounting is provided via 6×M6 bolts on the base plate. A minimum clearance of 500mm around the unit is required for maintenance access.
Wiring Diagram
The JDZX9-35W 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 (star-connected) are used for metering, while da/dn provide 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
- Pollution Environment: Select the JDZX9-35W for heavy pollution (Grade III-IV) due to its extended 1327mm creepage distance, which prevents flashover in contaminated conditions.
- Winding Configuration: Choose three-winding (Y/△) for basic metering and protection, or four-winding (Y/Y/△) for dual secondary outputs and system redundancy.
- Accuracy Requirements: Use class 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 (e.g., 45/100VA) aligns with connected loads; the thermal limit output is 600VA for all configurations.
- Environmental Suitability: Confirm ambient temperature (-5°C to +50°C), altitude (≤1000m standard), and pollution grade match your site conditions.
- Maintenance Strategy: Ideal for low-maintenance needs—epoxy cast-resin design eliminates oil testing and seal checks.
Frequently Asked Questions
Q1: Can this 35kV voltage transformer be used in coastal areas?
Yes, it is suitable for heavily polluted coastal environments. It features Grade III-IV pollution resistance and complete moisture protection via epoxy construction. Contact us for specific coastal project requirements.
Q2: How many units are required for a three-phase system?
Three single-phase units are needed for three-phase applications. The JDZX9-35W is designed as a single-phase transformer, so install three units to form a complete three-phase bank.
Q3: Which accuracy class is suitable for protection and metering?
Select 0.2 or 0.5 accuracy classes with 6P protection for combined metering and protection. The three-winding model provides dedicated secondary windings for ground fault detection. Specify your exact output VA during ordering.
Q4: What international standards does this cast-resin transformer comply with?
It complies with GB20840.3-2013 and IEC61869-3:2011 standards. These certifications ensure reliable performance for 35kV outdoor voltage measurement and protection. Factory test reports are provided upon request.
Q5: Can the altitude rating be customized for high-elevation projects?
Yes, standard models support altitudes up to 1000m. Higher altitude configurations are available upon request to meet specific project elevation needs. Please provide your site altitude for factory verification.
Q6: Where can this 35kV outdoor cast-resin voltage transformer be installed?
It is designed for outdoor substations, switching stations, and transmission networks. The epoxy resin housing provides excellent UV resistance and extended creepage distance for harsh outdoor conditions.
Q7: Is this product categorized as an inductive or capacitive voltage transformer?
It is an inductive electromagnetic voltage transformer. The JDZX9-35W utilizes epoxy cast-resin insulation for reliable 35kV outdoor voltage step-down applications.