JDZX9-35W 35kV Outdoor Epoxy Cast-Resin Voltage Transformer

Product Overview

The JDZX9-35W voltage transformer is an outdoor epoxy cast-resin single-phase measurement device engineered for 35kV high-voltage power systems with enhanced pollution flashover protection. This advanced voltage transformer features extended creepage distance (1327mm) that provides superior contamination resistance for reliable operation in heavily polluted industrial environments, coastal areas with salt spray, and regions with high humidity. The JDZX9-35W represents the optimal solution for outdoor voltage measurement applications where environmental contamination poses significant insulation challenges.

The JDZX9-35W 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 epoxy cast-resin construction provides maintenance-free operation throughout the equipment’s service life, eliminating the need for oil testing and seal inspection. Extended creepage distance (1327mm) ensures reliable performance in heavily polluted environments where standard insulation may experience flashover. 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

JDZX9-35W voltage transformer details

Application Position

The JDZX9-35W is installed in outdoor substations, high-voltage switching stations, and transmission networks where reliable voltage measurement is required under heavily polluted environmental conditions. The extended creepage distance (1327mm) provides superior contamination resistance for reliable operation in industrial zones with chemical pollution, coastal areas with salt spray, and regions with high humidity and dust accumulation. The epoxy cast-resin insulation system provides excellent UV resistance, moisture protection, and pollution tolerance for long-term outdoor operation without maintenance. 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 harsh environmental conditions where standard insulation may experience flashover.

Main Applications

35kV outdoor substations in heavily polluted industrial zones
Coastal power stations with salt spray contamination
High-voltage transmission networks in humid environments
Chemical plants and refineries with chemical pollution
Cement factories and mining operations with dust contamination
Rural electrification projects with limited maintenance resources
Utility networks requiring extended creepage distance for pollution flashover protection
Harsh environment applications where standard insulation may fail

Application Case Studies

Application Scenario 1: Coastal Substation with Severe Salt Spray Contamination
Coastal substations face severe salt spray contamination that can cause flashover on standard insulation systems. The JDZX9-35W offers superior pollution flashover protection with extended creepage distance (1327mm) that prevents salt deposit accumulation and flashover. The epoxy cast-resin insulation system provides complete moisture barrier and pollution resistance, preventing degradation from salt contamination. 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 extended creepage distance ensures reliable operation even in areas with severe salt spray where standard insulation may experience flashover during wet conditions.

Application Scenario 2: Industrial Zone with Chemical Pollution
Chemical plants and refineries generate airborne chemical pollutants that can degrade standard insulation materials and cause flashover. The JDZX9-35W features epoxy cast-resin insulation with superior chemical resistance that withstands exposure to sulfur compounds, chlorine, and other industrial pollutants without degradation. The extended creepage distance (1327mm) provides additional protection against pollution accumulation, ensuring reliable voltage measurement in heavily contaminated environments. The maintenance-free design eliminates the need for periodic cleaning or insulation testing, reducing operational costs while ensuring reliable performance throughout the equipment’s service life.

Application Fit

Suitable For

Outdoor 35kV voltage measurement in heavily polluted environments
Coastal areas with salt spray contamination
Industrial zones with chemical pollution
Applications requiring extended creepage distance (1327mm)
Maintenance-free operation requirements (no oil testing)
Harsh environment installations with UV exposure
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)
Creepage distance: 1327mm (extended for pollution flashover protection)
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)
Maintenance: Minimal (no oil testing or seal inspection required)

Technical Parameters

The JDZX9-35W series includes outdoor epoxy cast-resin single-phase voltage transformers for 35kV systems with extended creepage distance. 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)
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 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

JDZX9-35W voltage transformer dimension drawing

Overall dimensions: Height 695±5mm, base width 385mm, base depth 310mm. Weight: approximately 69kg. Mounting: 6×M6 mounting bolts on base plate. Clearance: Minimum 500mm around transformer for maintenance access. Top terminal: M10 bolt. Secondary outlet: 20×40mm outlet hole for cable connection. Creepage distance: 1327mm for extended pollution flashover protection.

Wiring Diagram

JDZX9-35W 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 69kg weight. Foundation should be 100mm above ground level to prevent water accumulation. Use anchor bolts (M6) secured into foundation with minimum 150mm embedment depth.
Grounding: Connect the grounding terminal (M8) 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 and extended creepage distance effectiveness.
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.

Extended Creepage Distance Features

Pollution Flashover Protection: Extended creepage distance (1327mm) provides superior contamination resistance for reliable operation in heavily polluted environments. The longer creepage path prevents flashover even when pollution accumulates on the insulation surface during wet conditions.
Coastal Environment Performance: The extended creepage distance prevents salt spray contamination from causing flashover, ensuring reliable voltage measurement in coastal substations where salt deposits can accumulate on insulation surfaces.
Industrial Pollution Resistance: Chemical plants, cement factories, and mining operations generate airborne pollutants that can degrade standard insulation. The extended creepage distance provides additional protection against pollution accumulation, maintaining insulation performance in heavily contaminated environments.
Maintenance-Free Operation: Epoxy cast-resin construction with extended creepage distance eliminates the need for periodic cleaning or insulation testing. The solid insulation system maintains consistent performance throughout the equipment’s service life without maintenance.
Enhanced Safety: The extended creepage distance provides additional safety margin against flashover during abnormal operating conditions, ensuring reliable voltage measurement and protection system operation even in severe environmental conditions.

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 JDZX9-35W voltage transformer, consider the following factors:

Environmental Pollution Level: Choose JDZX9-35W for heavily polluted environments (Grade III-IV) where extended creepage distance (1327mm) is required for pollution flashover protection
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
Creepage Distance Requirements: For heavily polluted environments, verify that 1327mm creepage distance meets your pollution flashover protection requirements

Ordering Information

When ordering the JDZX9-35W voltage transformer, please specify:

Model: JDZX9-35W
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

Extended creepage distance (1327mm) provides superior pollution flashover protection for reliable operation in heavily contaminated environments. The longer creepage path prevents flashover even when pollution accumulates on the insulation surface during wet conditions. This is critical for coastal substations with salt spray, industrial zones with chemical pollution, and areas with high dust accumulation where standard insulation may experience flashover.

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. The extended creepage distance may require occasional cleaning in extremely polluted environments to maintain optimal performance.

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.

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 35/√3 / 0.1/√3 / 0.1/3 and 35/√3 / 0.1/√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 and lead times.

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.

Epoxy cast-resin insulation with extended creepage distance (1327mm) 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 extended creepage distance prevents flashover even when salt deposits accumulate on the insulation surface during wet conditions.

The JDZX9-35W complies with GB20840.3-2013 (Chinese standard) and IEC61869-3:2011 (international standard) for voltage transformers, ensuring compatibility with both domestic and international high-voltage measurement applications.