JDZXW12-35R 35kV Outdoor Epoxy Cast-Resin Voltage Transformer

Product Overview

The JDZXW12-35R voltage transformer is an outdoor epoxy cast-resin single-phase measurement device engineered for 35kV high-voltage power systems. This advanced voltage transformer features integrated fuse protection with M45×1.5 copper caps and Φ25×400 fuse tubes (0.5/1A), providing comprehensive overcurrent protection for both the transformer and downstream equipment. The outdoor epoxy cast-resin insulation system eliminates the need for oil maintenance while delivering superior UV resistance, moisture protection, and pollution tolerance for reliable operation in harsh environmental conditions.

The JDZXW12-35R delivers flexible voltage measurement solutions with two winding configurations: three-winding (Y/△ connection) for basic metering and protection, or four-winding (Y/Y/△ connection) for dual secondary outputs with enhanced redundancy. Multiple accuracy classes (0.2, 0.5, 1.0) accommodate precision metering to general measurement requirements, with thermal limit output up to 600VA ensuring reliable performance under heavy burden conditions. The compact design (875mm total height, 71kg weight) facilitates installation in space-constrained outdoor substations while the epoxy cast-resin construction provides maintenance-free operation throughout the equipment’s service life. Wide operating temperature range (-5°C to +50°C) and compliance with GB20840.3-2013 and IEC61869-3:2011 standards ensure reliable performance across diverse applications.

Product Display

JDZXW12-35R voltage transformer details

Application Position

The JDZXW12-35R is installed in outdoor substations, high-voltage switching stations, and transmission networks where reliable voltage measurement is required under harsh environmental conditions. The outdoor epoxy cast-resin insulation system provides excellent UV resistance, moisture protection, and pollution tolerance for long-term outdoor operation without maintenance. The integrated fuse protection eliminates the need for external fusing, reducing installation complexity and improving system reliability. Typical installation includes concrete foundation mounting with proper grounding and clearance for maintenance access. The compact design (875mm height) allows installation in space-constrained locations where larger oil-immersed transformers cannot fit.

Main Applications

35kV outdoor substations and switching stations
High-voltage transmission line voltage monitoring
Industrial power distribution systems with outdoor switchgear
Renewable energy substations (wind farms, solar plants)
Rural electrification projects with outdoor distribution
Utility networks requiring maintenance-free voltage measurement
Harsh environment applications (coastal areas, industrial pollution)

Application Case Studies

Application Scenario 1: Outdoor Substation Voltage Measurement with Integrated Protection
Utilities deploy JDZXW12-35R epoxy cast-resin voltage transformers in 35kV outdoor substations where maintenance-free operation and integrated protection are critical. The epoxy cast-resin insulation system eliminates oil testing and seal inspection requirements, reducing annual maintenance costs by 80% compared to oil-immersed transformers. The integrated fuse protection (Φ25×400, 0.5/1A) provides immediate overcurrent protection without external fusing, improving system reliability and reducing installation time. The four-winding configuration (Y/Y/△) provides separate outputs for metering (accuracy class 0.2), protection (6P), and open-delta ground fault detection, ensuring reliable operation under all system conditions while the epoxy construction withstands UV radiation, moisture, and industrial pollution without degradation.

Application Scenario 2: Coastal Substation with High Pollution and Humidity
Coastal substations require voltage transformers that can withstand salt spray, high humidity, and industrial pollution without performance degradation. The JDZXW12-35R offers superior environmental protection with epoxy cast-resin insulation that provides complete moisture barrier and pollution resistance. Unlike oil-immersed transformers that require periodic seal inspection and oil testing, the epoxy construction maintains consistent insulation performance throughout the service life without maintenance. The integrated fuse protection ensures reliable operation even under fault conditions, while the compact design (71kg weight, 875mm height) allows installation on existing foundations without structural modifications. The wide operating temperature range (-5°C to +50°C) ensures reliable performance in coastal climates with temperature extremes.

Application Fit

Suitable For

Outdoor 35kV voltage measurement applications
Maintenance-free operation requirements (no oil testing)
Harsh environment installations (coastal, industrial pollution)
Applications requiring integrated fuse protection
Space-constrained installations (compact design)
UV exposure environments (epoxy resin UV resistance)
High humidity or moisture-prone locations

Not Recommended For

Indoor installation applications (use indoor-rated models like JDZ9-35Q)
Current measurement applications (use CT instead)
High-voltage systems above 40.5kV (use higher voltage class models)
Applications requiring very high thermal capacity (>600VA)
Extreme cold environments below -5°C (use special low-temperature models)

Installation 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)
UV resistance: Excellent (epoxy resin provides UV protection)
Moisture protection: Complete moisture barrier (epoxy construction)
Maintenance: Minimal (no oil testing or seal inspection required)

Technical Parameters

The JDZXW12-35R series includes outdoor epoxy cast-resin single-phase voltage transformers for 35kV systems with integrated fuse protection. Operating temperature -5°C to +50°C, compliant with GB20840.3-2013 and IEC61869-3:2011 standards.

Model	Rated Voltage (kV)	Accuracy Class & Rated Output (VA)	Thermal Limit Output (VA)	Insulation Level (kV)
JDZXW12-35R (Three-winding)	33/√3 / 0.11/√3 or 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
JDZXW12-35R (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 1: Three-winding configuration (35/√3 / 0.1/√3 / 0.1/√3) – Standard Y/△ connection for metering, protection, and ground fault detection.

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

Dimension Reference

JDZXW12-35R voltage transformer dimension drawing

Overall dimensions: Height 875±10mm, base width 403mm (inner width 310mm), base depth 280mm (inner width 250mm). Weight: approximately 71kg. Mounting: 4×M6 mounting holes on base plate. Clearance: Minimum 600mm around transformer for maintenance access. Top terminal: M12 bolt. Secondary outlet: 3×Φ23mm holes.

Wiring Diagram

JDZXW12-35R voltage transformer wiring diagram

Three-winding: Primary terminals A, B, C connect to star configuration with neutral N. Secondary outputs a, b, c for metering (star connection), da/dn for open-delta ground fault detection. Four-winding: Additional secondary outputs 2a, 2b, 2c with neutral 2n for separate protection circuit. Integrated fuse protection: M45×1.5 copper caps with Φ25×400 fuse tubes (0.5/1A rating).

Installation Guidelines

Foundation: Install on a level concrete foundation capable of supporting 71kg weight. Foundation should be 100mm above ground level to prevent water accumulation. Use anchor bolts (M12) secured into foundation with minimum 150mm embedment depth.
Grounding: Connect the grounding terminal to the substation grounding grid using copper conductor with minimum 35mm² cross-section. Ensure grounding resistance is less than 4 ohms.
Clearance: Maintain minimum 600mm clearance on all sides for maintenance access and ventilation. Ensure adequate clearance from live parts according to local electrical codes (typically 400mm for 35kV).
Primary Connection: Connect primary terminals (A, B, C) to the 35kV power system using appropriate high-voltage conductors or busbars. Ensure proper phase sequence and torque specifications (typically 40 N·m for M12 bolts).
Secondary Connection: Connect secondary terminals to metering devices, protection relays, or monitoring equipment according to the wiring diagram. Use shielded cables for secondary circuits to minimize electromagnetic interference. Ensure proper termination and labeling.
Fuse Inspection: Before energizing, verify that integrated fuses (Φ25×400, 0.5/1A) are properly installed and rated for the application. Check fuse continuity and ensure copper caps (M45×1.5) are properly tightened.
Commissioning Tests: Perform insulation resistance test (minimum 1000 MΩ at 20°C), turns ratio test, and polarity test before energizing. Verify all connections are tight and properly torqued.

Epoxy Cast-Resin Insulation Features

Maintenance-Free Operation: Epoxy cast-resin construction eliminates the need for oil testing, seal inspection, and oil replacement. The solid insulation system maintains consistent performance throughout the equipment’s service life without periodic maintenance.
Superior Moisture Protection: Epoxy resin provides complete moisture barrier, preventing water ingress and insulation degradation. Unlike oil-immersed transformers that require seal inspection, the epoxy construction maintains moisture resistance without maintenance.
Excellent UV Resistance: Epoxy cast-resin insulation provides superior UV resistance, preventing degradation from solar radiation. The material maintains mechanical strength and dielectric properties even after years of outdoor exposure.
Pollution Tolerance: Epoxy resin surface provides excellent pollution resistance, preventing contamination buildup and flashover. The smooth surface facilitates self-cleaning during rain, maintaining insulation performance in industrial and coastal environments.
Compact Design: Epoxy cast-resin construction allows more compact design compared to oil-immersed transformers. The JDZXW12-35R achieves 875mm total height and 71kg weight, facilitating installation in space-constrained locations.

Integrated Fuse Protection Features

Overcurrent Protection: Integrated fuse tubes (Φ25×400, 0.5/1A) provide immediate overcurrent protection for both the transformer and downstream equipment. The fuses interrupt fault currents within milliseconds, preventing equipment damage and system outages.
M45×1.5 Copper Caps: High-quality copper caps provide excellent electrical conductivity and mechanical strength. The M45×1.5 thread ensures secure connection and facilitates fuse replacement when required.
Reduced Installation Complexity: Integrated fuse protection eliminates the need for external fusing, reducing installation time and cost. The compact design combines transformer and protection in a single unit.
Improved System Reliability: Integrated protection ensures reliable operation under fault conditions, preventing cascading failures and improving overall system reliability.

Standards

GB20840.3-2013 (Instrument transformers – Part 3: Inductive voltage transformers)
IEC61869-3:2011 (Instrument transformers – Part 3: Inductive voltage transformers)
Customer-specific requirements available on request

Selection Guide

When selecting the JDZXW12-35R voltage transformer, consider the following factors:

Winding Configuration: Choose three-winding (Y/△) for basic metering and protection, or four-winding (Y/Y/△) for dual secondary outputs and enhanced redundancy
Accuracy Class: Choose 0.2 for revenue metering, 0.5 for monitoring applications, 1.0 for general measurement, 6P(3P) for protection applications
Burden Requirements: Ensure the rated output matches the connected load (metering devices, relays) to maintain accuracy. Thermal limit output is 600VA for both configurations
Environmental Conditions: Verify ambient temperature (-5°C to +50°C), altitude (≤1000m standard), and pollution grade match your installation environment
Maintenance Capability: Epoxy cast-resin transformers require minimal maintenance (no oil testing). Ensure this aligns with your maintenance strategy
Space Constraints: Compact design (875mm height, 71kg weight) allows installation in space-constrained locations
Protection Requirements: Integrated fuse protection (Φ25×400, 0.5/1A) provides overcurrent protection without external fusing

Ordering Information

When ordering the JDZXW12-35R voltage transformer, please specify:

Model: JDZXW12-35R
Winding configuration: Three-winding or Four-winding
Rated voltage ratio (e.g., 35/√3 / 0.1/√3 / 0.1/√3 kV)
Accuracy class and rated output (e.g., 0.2/6P(3P), 45/100VA)
Rated frequency (50Hz or 60Hz)
Fuse rating (0.5A or 1A)
Quantity required
Any special requirements or custom specifications

FAQs

Epoxy cast-resin transformers use solid epoxy insulation, requiring minimal maintenance (no oil testing or seal inspection). They are suitable for outdoor applications with excellent UV resistance and moisture protection. Oil-immersed transformers use transformer oil for insulation and cooling, providing superior thermal dissipation but requiring periodic maintenance including oil testing and seal inspection.

Epoxy cast-resin transformers require minimal maintenance. Periodic visual inspection for physical damage or contamination is recommended. Unlike oil-immersed transformers, there is no need for oil testing, seal inspection, or oil replacement. The solid insulation system maintains consistent performance throughout the equipment’s service life.

While technically possible, the JDZXW12-35R is designed for outdoor installation with UV resistance and weather protection. For indoor applications, we recommend indoor-rated models like JDZ9-35Q, which have smaller footprint and are optimized for indoor environmental conditions.

The compact design (875mm height, 71kg weight) allows installation in space-constrained locations where larger transformers cannot fit. The lightweight design also reduces foundation requirements and installation costs. The compact size facilitates transportation and handling during installation.

The four-winding configuration (Y/Y/△) provides dual secondary outputs for separate metering and protection circuits. This allows independent measurement for revenue metering (accuracy class 0.2) and protection relays (accuracy class 6P) without interference between circuits. The open-delta output provides ground fault detection capability.

For revenue metering applications, accuracy class 0.2 is recommended to ensure precise energy measurement. Class 0.5 is suitable for monitoring and general measurement applications. Class 6P(3P) is used for protection applications where accuracy is less critical than reliability.

Epoxy cast-resin insulation provides excellent performance in coastal environments with salt spray and high humidity. The solid insulation system provides complete moisture barrier and pollution resistance, preventing degradation from salt contamination. The smooth surface facilitates self-cleaning during rain, maintaining insulation performance without maintenance.

The thermal limit output is 600VA for both three-winding and four-winding configurations. This represents the maximum burden the transformer can supply without exceeding temperature rise limits. This ensures reliable operation even under heavy load conditions in high ambient temperatures (+50°C).

Standard ratios include 33/√3 / 0.11/√3 and 35/√3 / 0.1/√3 / 0.1/√3. Custom ratios can be manufactured based on specific project requirements. Please contact our technical team for custom specifications.

With proper installation and normal operating conditions, epoxy cast-resin transformers have service life exceeding 30 years. The solid insulation system does not degrade over time like oil-immersed insulation. Key factors affecting service life include operating temperature, load conditions, and environmental factors. The maintenance-free design ensures reliable operation throughout the equipment lifespan.