JDZW-35R/280 JDZX(F)W-35R 35kV Outdoor Epoxy Cast-Resin Voltage Transformer with Built-in Fuse

Product Overview

The JDZW-35R/280 and JDZX(F)W-35R voltage transformers are outdoor single-phase epoxy cast-resin measurement devices for 35kV systems with integrated fuse protection. The epoxy cast-resin insulation provides maintenance-free operation and compact design compared to oil-immersed alternatives. Built-in fuse protection eliminates the need for external fuses, simplifying installation.

The series includes JDZW-35R/280 (35/0.1kV or 35/0.1/0.1kV) for standard voltage transformation with 1000VA thermal limit output, and JDZX(F)W-35R (35/√3 : 0.1/√3 : 0.1/3kV or 35/√3 : 0.1/√3 : 0.1/√3 : 0.1/3kV) with residual voltage winding for ground fault detection. Multiple accuracy classes (0.2, 0.5, 1.0, 3P, 6P) accommodate precision metering to protection requirements. Operating temperature -25°C to +40°C, compliant with GB20840.1-2010 and GB20840.3-2013 standards.

Product Display

JDZW-35R voltage transformer details

Application Position

The JDZW-35R/280 and JDZX(F)W-35R is installed in outdoor substations, high-voltage switching stations, and transmission networks where reliable voltage measurement with integrated fuse protection is required. The epoxy cast-resin insulation system provides maintenance-free operation, making it ideal for applications where periodic maintenance is impractical or costly. The compact design and built-in fuse protection simplify installation and reduce equipment footprint. Typical installation includes concrete foundation mounting with proper grounding and clearance for maintenance access. The epoxy cast-resin construction withstands harsh outdoor conditions including extreme temperatures (-25°C to +40°C), humidity, and pollution without degradation.

Main Applications

35kV outdoor substations requiring integrated fuse protection
High-voltage transmission line voltage monitoring
Industrial power distribution systems with maintenance-free requirements
Renewable energy substations (wind farms, solar plants)
Rural electrification projects with outdoor distribution
Utility networks requiring ground fault detection (JDZX(F)W-35R)
Applications with space constraints requiring compact design
High-burden applications requiring 1000VA thermal limit output
Environments where epoxy cast-resin maintenance-free operation is preferred

Application Case Studies

Application Scenario 1: Maintenance-Free Outdoor Substation Voltage Measurement
Utilities deploy JDZW-35R/280 epoxy cast-resin voltage transformers in 35kV outdoor substations where maintenance-free operation is critical. The epoxy cast-resin insulation system eliminates the need for periodic oil testing and maintenance, reducing operational costs and improving reliability. The 1000VA thermal limit output ensures reliable performance even under heavy burden conditions. The built-in fuse protection provides integrated overcurrent protection, eliminating the need for external fuses and simplifying the protection scheme. The compact design allows installation in space-constrained substations where oil-immersed transformers would be impractical.

Application Scenario 2: Ground Fault Detection with Integrated Protection
Industrial facilities with 35kV distribution networks require reliable ground fault detection with integrated protection. The JDZX(F)W-35R model with residual voltage winding (35/√3 : 0.1/√3 : 0.1/√3 : 0.1/3kV ratio) provides dedicated ground fault detection capability through the open-delta secondary winding configuration. The residual voltage winding detects zero-sequence voltage during ground faults, enabling protective relays to quickly isolate faulty sections and prevent cascading failures. The epoxy cast-resin insulation system provides maintenance-free operation, while the built-in fuse protection ensures reliable overcurrent protection without external components.

Application Fit

Suitable For

Outdoor 35kV voltage measurement applications
High thermal capacity requirements (1000VA limit output)
Maintenance-free operation requirements
Ground fault detection applications (JDZX(F)W-35R model)
Applications requiring integrated fuse protection
Space-constrained installations requiring compact design
High-voltage transmission and distribution networks
Industrial facilities with 35kV distribution systems
Environments where epoxy cast-resin is preferred over oil-immersed

Not Recommended For

Indoor installation applications (use indoor-rated models)
Current measurement applications (use CT instead)
High-voltage systems above 40.5kV (use higher voltage class models)
Applications requiring superior thermal dissipation (use oil-immersed models)
Extreme temperature environments below -25°C (use oil-immersed models with -40°C rating)

Installation Conditions

Installation position: Outdoor substations, switching stations, or transmission networks
Ambient temperature: -25°C to +40°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)
Protection: Built-in fuse (integrated overcurrent protection)
Maintenance: Maintenance-free operation (no periodic oil testing required)

Technical Parameters

The JDZW-35R/280 and JDZX(F)W-35R series includes outdoor single-phase epoxy cast-resin voltage transformers for 35kV systems with integrated fuse protection. Operating temperature -25°C to +40°C, compliant with GB20840.1-2010 and GB20840.3-2013 standards.

Model	Rated Voltage Ratio (kV)	Accuracy Class & Rated Output (VA)	Thermal Limit Output (VA)	Insulation Level (kV)
JDZW-35R/280 (Standard)	35/0.1	0.2: 50 0.5: 100 1.0: 200	1000	40.5/95/200
JDZW-35R/280 (With residual)	35/0.1/0.1	0.2/0.5: 30/40	2×500	40.5/95/200
JDZX(F)W-35R (Standard)	35/√3 : 0.1/√3 : 0.1/3	0.2(0.5) 3P(6P): 30(60)/100	600	40.5/95/200
JDZX(F)W-35R (With residual)	35/√3 : 0.1/√3 : 0.1/√3 : 0.1/3	0.2/0.5 3P(6P): 15/20/100 0.2/0.2 3P(6P): 15/15/100	2×300	40.5/95/200

Note 1: JDZW-35R/280 – Standard voltage transformation for metering and protection applications with 1000VA thermal limit output.

Note 2: JDZW-35R/280 with residual winding – Includes residual voltage winding for ground fault detection with 2×500VA thermal limit output.

Note 3: JDZX(F)W-35R – Voltage transformation with ground fault detection capability and 600VA thermal limit output.

Note 4: JDZX(F)W-35R with residual winding – Enhanced configuration with dual residual windings for redundant ground fault detection with 2×300VA thermal limit output.

Note 5: Rated output and its relative accuracy class only one alternative per transformer.

Note 6: If user’s data go beyond the above-mentioned scopes, they may be subject to an agreement between manufacturer and purchaser.

Installation

Dimension Reference

JDZW-35R voltage transformer dimension drawing

Overall dimensions: Height approximately 850+10mm, Top width 642.5mm, Base width 445mm, Footprint 758×510mm. Weight: approximately 126kg. Mounting: Base mounting feet with bolt holes. Insulator angle: 22.5° V-configuration. Clearance: Minimum 600mm around transformer for maintenance access. Top terminals: High-voltage bushings with gold-colored terminals. Secondary outlet: Secondary terminal box on base for cable connection. Built-in fuse: Integrated fuse protection in primary circuit.

Wiring Diagram

JDZW-35R voltage transformer wiring diagram

JDZW-35R/280 and JDZX(F)W-35R supports multiple wiring configurations: Star connection (Y) for standard voltage measurement, or Star connection with residual winding for ground fault detection. Primary terminals A, B, C connect to 35kV system. Secondary outputs 1a, 1b, 1c; 2a, 2b, 2c; 3a, 3b, 3c for multiple metering and protection applications. The built-in fuse provides integrated overcurrent protection in the primary circuit. Ensure proper polarity and phase sequence during installation.

Installation Guidelines

Foundation: Install on a level concrete foundation capable of supporting 126kg weight. Foundation should be 150mm above ground level to prevent water accumulation. Use anchor bolts secured into foundation with minimum 200mm embedment depth.
Grounding: Connect the grounding terminal to the substation grounding grid using copper conductor with minimum 50mm² cross-section. Ensure grounding resistance is less than 4 ohms. Ground the transformer base and secondary winding neutral point.
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. The built-in fuse provides integrated overcurrent protection.
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 insulation for any damage or cracks. Verify all connections are tight and properly torqued. Check that the built-in fuse is intact and properly seated.
Commissioning Tests: Perform insulation resistance test (minimum 1000 MΩ at 20°C), turns ratio test, and polarity test before energizing. Verify fuse operation and coordination with protective relays.

Epoxy Cast-Resin Insulation Features

Maintenance-Free Operation: Epoxy cast-resin insulation eliminates the need for periodic oil testing and maintenance, reducing operational costs and improving reliability. The solid insulation system does not degrade over time like oil-immersed systems.
Compact Design: Epoxy cast-resin transformers have a smaller footprint compared to oil-immersed alternatives, allowing installation in space-constrained substations. The compact design also reduces material costs and weight.
Excellent Dielectric Strength: Epoxy resin provides excellent dielectric strength, ensuring reliable insulation between windings and from windings to ground. The solid insulation system is resistant to moisture, dust, and pollutants.
Built-in Fuse Protection: Integrated fuse protection provides overcurrent protection without external components, simplifying the protection scheme and reducing installation costs. The built-in fuse is coordinated with the transformer’s thermal characteristics.
Environmental Resistance: Epoxy cast-resin insulation is resistant to UV radiation, moisture, temperature variations, and chemical exposure, ensuring reliable operation in harsh outdoor environments.

Standards

GB20840.1-2010 (Instrument transformers – Part 1: General requirements)
GB20840.3-2013 (Instrument transformers – Part 3: Inductive voltage transformers)
Customer-specific requirements available on request

Selection Guide

When selecting the JDZW-35R/280 or JDZX(F)W-35R voltage transformer, consider the following factors:

Model Selection: Choose JDZW-35R/280 for standard voltage measurement with 1000VA thermal limit output, or JDZX(F)W-35R with residual voltage winding for ground fault detection
Accuracy Class: Choose 0.2 for revenue metering, 0.5 for monitoring applications, 1.0 for general measurement, 3P for protection applications, 6P for extended protection range
Burden Requirements: Ensure the rated output matches the connected load (metering devices, relays) to maintain accuracy. Thermal limit output is 1000VA for JDZW-35R/280 or 600VA for JDZX(F)W-35R
Environmental Conditions: Verify ambient temperature (-25°C to +40°C), altitude (≤1000m standard) match your installation environment
Maintenance Requirements: Epoxy cast-resin transformers are maintenance-free, making them ideal for applications where periodic maintenance is impractical
Ground Fault Detection: If ground fault detection is required, select JDZX(F)W-35R model with residual voltage winding
Space Constraints: Epoxy cast-resin transformers have compact design, suitable for space-constrained installations
Integrated Protection: Built-in fuse provides overcurrent protection without external components

Ordering Information

When ordering the JDZW-35R/280 or JDZX(F)W-35R voltage transformer, please specify:

Model: JDZW-35R/280 or JDZX(F)W-35R
Rated voltage ratio (e.g., 35/0.1kV or 35/√3 : 0.1/√3 : 0.1/3kV)
Accuracy class and rated output (e.g., 0.2-50VA or 0.2(0.5) 3P(6P)-30(60)/100VA)
Rated frequency (50Hz or 60Hz)
Quantity required
Any special requirements or custom specifications

FAQs

JDZW-35R/280 is a standard voltage transformer with 35/0.1kV or 35/0.1/0.1kV ratio for basic voltage measurement and 1000VA thermal limit output. JDZX(F)W-35R includes ground fault detection capability with 35/√3 : 0.1/√3 : 0.1/3kV ratio and 600VA thermal limit output. JDZX(F)W-35R with residual voltage winding (35/√3 : 0.1/√3 : 0.1/√3 : 0.1/3kV) provides enhanced ground fault detection with 2×300VA thermal limit output.

Epoxy cast-resin insulation provides maintenance-free operation, eliminating the need for periodic oil testing and maintenance. The compact design allows installation in space-constrained substations. Epoxy resin is resistant to moisture, dust, and pollutants, ensuring reliable operation in harsh environments. Oil-immersed transformers have superior thermal dissipation but require periodic maintenance.

The built-in fuse provides integrated overcurrent protection in the primary circuit, eliminating the need for external fuses. The fuse is coordinated with the transformer’s thermal characteristics to provide reliable protection against overcurrent conditions. This simplifies the protection scheme and reduces installation costs.

For revenue metering applications, accuracy class 0.2 is recommended to ensure precise energy measurement with 50VA rated output. Class 0.5 (100VA) is suitable for monitoring and general measurement applications. Class 3P (100VA) or 6P is used for protection applications where accuracy is less critical than reliability during fault conditions.

With proper installation, epoxy cast-resin transformers have service life exceeding 30 years. The solid insulation system does not degrade over time like oil-immersed systems. Key factors affecting service life include operating temperature, load conditions, and environmental factors. The maintenance-free design eliminates oil aging concerns, extending service life.

Standard ratios include 35/0.1kV, 35/0.1/0.1kV, 35/√3 : 0.1/√3 : 0.1/3kV, and 35/√3 : 0.1/√3 : 0.1/√3 : 0.1/3kV. Custom ratios can be manufactured based on specific project requirements. Please contact our technical team for custom specifications and lead times. Custom ratios may affect accuracy class and rated output capabilities.

The JDZW-35R/280 and JDZX(F)W-35R complies with GB20840.1-2010 (general requirements) and GB20840.3-2013 (inductive voltage transformers) for voltage transformers, ensuring compatibility with Chinese high-voltage measurement applications. The transformers are tested and certified according to these standards for accuracy, insulation, and thermal performance.

The transformer weighs approximately 126kg. Overall dimensions: Height approximately 850+10mm, Top width 642.5mm, Base width 445mm, Footprint 758×510mm. The V-configuration insulators are angled at 22.5°. The compact design allows installation in space-constrained substations where larger oil-immersed transformers would be impractical.

JDZW-35R/280 JDZX(F)W Outdoor Epoxy Cast-Resin Voltage Transformer, Built-in Fuse