JDZX16-35W 35kV Outdoor Epoxy Cast-Resin Voltage Transformer

Product Overview

The JDZX16-35W voltage transformer is an outdoor epoxy cast-resin single-phase measurement device engineered for 35kV high-voltage power systems. This advanced voltage transformer features compact design (677mm total height, 53.2kg weight) with outdoor epoxy cast-resin insulation system that eliminates the need for oil maintenance while delivering superior UV resistance, moisture protection, and pollution tolerance for reliable operation in harsh environmental conditions. The JDZX16-35W represents the next generation of maintenance-free voltage measurement solutions for outdoor substations and transmission networks.

The JDZX16-35W delivers flexible voltage measurement solutions with multiple 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 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 IEC60044-2:2003 standards ensure reliable performance across diverse applications.

Product Display

JDZX16-35W voltage transformer details

Application Position

The JDZX16-35W 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 compact design (677mm height, 53.2kg weight) allows installation in space-constrained locations where larger transformers cannot fit. Typical installation includes concrete foundation mounting with proper grounding and clearance for maintenance access. The epoxy construction withstands UV radiation, moisture, and industrial pollution without degradation, making it ideal for coastal areas, industrial zones, and regions with extreme weather conditions.

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)
Space-constrained installations requiring compact design

Application Case Studies

Application Scenario 1: Compact Outdoor Substation Voltage Measurement
Utilities deploy JDZX16-35W epoxy cast-resin voltage transformers in 35kV outdoor substations where space constraints and maintenance-free operation are critical. The compact design (677mm height, 53.2kg weight) allows installation on existing foundations without structural modifications, reducing installation costs by 40% compared to larger transformers. 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 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 JDZX16-35W 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 compact design (53.2kg weight) allows installation on lightweight foundations, while the wide operating temperature range (-5°C to +50°C) ensures reliable performance in coastal climates with temperature extremes. The high insulation level (40.5/95/200kV) provides excellent dielectric strength for reliable operation in high-humidity environments.

Application Fit

Suitable For

Outdoor 35kV voltage measurement applications
Maintenance-free operation requirements (no oil testing)
Harsh environment installations (coastal, industrial pollution)
Space-constrained installations (compact design)
Applications requiring lightweight transformers (53.2kg)
UV exposure environments (epoxy resin UV resistance)
High humidity or moisture-prone locations
Rural electrification projects with limited maintenance resources

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)
Three-phase measurement in single unit (use three separate single-phase units)

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 JDZX16-35W series includes outdoor epoxy cast-resin single-phase voltage transformers for 35kV systems. Operating temperature -5°C to +50°C, compliant with GB20840.3-2013 and IEC60044-2:2003 standards.

Model	Rated Voltage (kV)	Accuracy Class & Rated Output (VA)	Thermal Limit Output (VA)	Insulation Level (kV)
JDZX16-35W (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
JDZX16-35W (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 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

JDZX16-35W voltage transformer dimension drawing

Overall dimensions: Height 677mm, base width 350mm, base depth 310mm. Weight: approximately 53.2kg. Mounting: 4×M10 mounting holes on base plate. Clearance: Minimum 500mm around transformer for maintenance access. Top terminal: M10 bolt. Secondary outlet: Bottom outlet hole for cable connection.

Wiring Diagram

JDZX16-35W 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.

Installation Guidelines

Foundation: Install on a level concrete foundation capable of supporting 53.2kg weight. Foundation should be 100mm above ground level to prevent water accumulation. Use anchor bolts (M10) 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 500mm 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 M10 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.
Inspection: Before energizing, inspect the epoxy cast-resin body for any physical damage or contamination. Clean the surface if necessary to maintain insulation performance.
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 JDZX16-35W achieves 677mm total height and 53.2kg weight, facilitating installation in space-constrained locations.

Standards

GB20840.3-2013 (Instrument transformers – Part 3: Inductive voltage transformers)
IEC60044-2:2003 (Instrument transformers – Part 2: Inductive voltage transformers)
Customer-specific requirements available on request

Selection Guide

When selecting the JDZX16-35W 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 (677mm height, 53.2kg weight) allows installation in space-constrained locations
Weight Requirements: Lightweight design (53.2kg) allows installation on lightweight foundations without structural modifications

Ordering Information

When ordering the JDZX16-35W voltage transformer, please specify:

Model: JDZX16-35W
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)
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 JDZX16-35W 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 (677mm height, 53.2kg 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.