JDZX9-35G/210 35kV Indoor Epoxy Cast-Resin Voltage Transformer

Product Overview

The JDZX9-35G/210 voltage transformer is an indoor epoxy cast-resin single-phase measurement device designed for 35kV medium-voltage distribution systems. This advanced voltage transformer features epoxy resin cast insulation technology, providing excellent dielectric strength and maintenance-free operation for reliable performance in indoor environments.

The JDZX9-35G/210 delivers precise voltage measurement for energy metering, voltage monitoring, and relay protection applications with multiple accuracy classes (0.2, 0.5, 1.0) and Y/△ winding configuration. The epoxy resin cast construction ensures superior insulation performance with 40.5/80/185kV insulation level while providing up to 600VA thermal limit output capacity. Compact design with 42.15kg weight simplifies installation and reduces structural support requirements.

Product Display

JDZX9-35G/210 voltage transformer display

The JDZX9-35G/210 indoor epoxy cast-resin voltage transformer features a compact design with tiered insulator structure for enhanced creepage distance. The dark brown epoxy resin housing provides excellent insulation performance with 40.5/80/185kV rated insulation level. The unit includes a clear terminal box for secondary connections and a metal base plate for secure mounting.

Application Position

The JDZX9-35G/210 is installed in indoor switchgear, substations, and distribution networks where reliable single-phase voltage measurement is required. The epoxy resin insulation provides excellent moisture resistance and long-term durability for indoor operation. Three units are typically connected in three-phase configuration with star-connected primary and secondary windings, plus open-delta connected residual voltage winding for ground fault detection.

Main Applications

35kV indoor distribution networks
Substations requiring voltage measurement with ground fault detection
Industrial facilities with medium-voltage supply
Energy metering applications
Voltage monitoring and relay protection
Indoor power distribution systems

Application Case Studies

Application Scenario 1: Substation Voltage Measurement with Ground Fault Detection
Utilities deploy three JDZX9-35G/210 epoxy cast-resin voltage transformers in 35kV indoor substations for energy metering and ground fault protection. The three-winding configuration with Y/△ connection provides accurate voltage signals for protection relays and metering devices, while the open-delta connected residual voltage winding enables reliable ground fault detection. The epoxy resin insulation ensures reliable performance in indoor environments with 40.5/80/185kV insulation level and maintenance-free operation.

Application Scenario 2: Industrial Medium-Voltage Metering
Industrial facilities with 35kV incoming supply require accurate voltage measurement for energy management and protection coordination. The JDZX9-35G/210 offers multiple accuracy classes (0.2, 0.5, 1.0) to meet different measurement requirements, with 600VA thermal limit output capacity for various burden conditions. The compact 42.15kg design simplifies installation in space-constrained switchgear panels.

Application Fit

Suitable For

Indoor 35kV voltage measurement
Substations with ground fault detection requirements
Industrial facilities with medium-voltage supply
Voltage monitoring applications
Relay protection systems
Environments requiring maintenance-free operation

Not Recommended For

Outdoor installation applications (use outdoor-rated models)
Current measurement applications (use CT instead)
High-voltage systems above 40.5kV (use higher voltage class models)
Applications requiring three-phase measurement in single unit

Installation Conditions

Installation position: Indoor switchgear, substations, or distribution points
Ambient temperature: -5°C to +40°C
Altitude: ≤ 1000m (standard), higher altitude available on request
Insulation: Epoxy resin cast
Frequency: 50Hz or 60Hz
Connection: Single-phase (three units for three-phase system)
Maintenance: Minimal maintenance required (epoxy resin design)

Technical Parameters

The JDZX9-35G/210 series includes indoor epoxy cast-resin single-phase voltage transformers for 35kV systems. Operating temperature -5°C to +40°C, compliant with GB1207-2006 and IEC60044-2:2003 standards.

Rated Voltage (kV)	Accuracy Class & Rated Output (VA)	Thermal Limit Output (VA)	Insulation Level (kV)
35/√3 : 0.1/√3 : 0.1/3	0.2/3(6)P: 30/100 0.5/3(6)P: 60/100 1.0/3(6)P: 100/100	600	40.5/80/185
35/√3 : 0.1/√3 : 0.1/3 : 0.1/√3 : 0.1/3	0.2/0.5/3(6)P: 15/20/100 0.5/0.5/3(6)P: 30/30/100	600	40.5/80/185

Note 1: Three-winding configuration (35/√3 : 0.1/√3 : 0.1/3) – Standard Y/△ connection for basic metering and protection applications.

Note 2: Five-winding configuration (35/√3 : 0.1/√3 : 0.1/3 : 0.1/√3 : 0.1/3) – Enhanced configuration with dual secondary outputs for maximum flexibility and redundancy.

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

JDZX9-35G/210 voltage transformer dimension drawing

Overall dimensions: Top width 320mm, base width 420mm, height 300mm. Creepage distance: 710mm. Weight: approximately 42.15kg. Mounting holes: M6, M10 on base plate. Ground terminal: M8.

Dimension Reference

Overall dimensions: Top width 320mm, base width 420mm, height 300mm. Creepage distance: 710mm. Weight: approximately 42.15kg. Mounting holes: M6, M10 on base plate. Ground terminal: M8. See Installation section for detailed dimension drawing.

Overall dimensions: 320mm (top width) × 420mm (base width) × 300mm (height). Creepage distance: 710mm. Weight: approximately 42.15kg. Mounting holes: M6, M10 on base plate.

Wiring Diagram

JDZX9-35G/210 voltage transformer wiring diagram

Y/△ Connection (Three-Winding) – Primary terminals A, B, C connect to star configuration, secondary outputs a, b, c for metering, da/dn for open-delta ground fault detection.

Installation Guidelines

Mounting: Secure the transformer to a flat, stable surface using the mounting holes on the base plate. Ensure the mounting surface can support the 42.15kg weight.
Clearance: Maintain adequate clearance around the transformer for ventilation and maintenance access. Follow local electrical codes for minimum clearance requirements.
Primary Connection: Connect the primary terminals (A, N) to the 35kV power system using appropriate high-voltage cables and connectors. Ensure proper torque specifications are followed.
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.
Grounding: Ensure proper grounding of the transformer base and secondary circuit neutral point for safety and accurate measurement.

Epoxy Resin Features

Superior Insulation: Epoxy resin provides excellent dielectric strength with rated insulation level up to 40.5/80/185kV
Moisture Resistance: Cast-resin construction prevents moisture ingress, ensuring stable performance in humid environments
Mechanical Strength: Epoxy resin housing offers high impact resistance and structural integrity
Maintenance-Free: Sealed epoxy design eliminates the need for regular insulation testing or oil maintenance
Long Service Life: Epoxy resin insulation resists aging and maintains performance over decades of operation

Standards

GB1207-2006 (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 JDZX9-35G/210 voltage transformer, consider the following factors:

Accuracy Class: Choose 0.2 for revenue metering, 0.5 for monitoring applications, 1.0 for general measurement, 3(6)P for protection applications
Winding Configuration: Select three-winding (Y/△) for basic metering and protection, or five-winding for dual secondary outputs and enhanced redundancy
Burden Requirements: Ensure the rated output matches the connected load (metering devices, relays) to maintain accuracy
Environmental Conditions: Verify ambient temperature (-5°C to +40°C) and altitude (≤1000m standard) match your installation environment

Ordering Information

When ordering the JDZX9-35G/210 voltage transformer, please specify:

Model: JDZX9-35G/210
Rated voltage ratio (e.g., 35/√3 / 0.1/√3 / 0.1/3 kV)
Accuracy class and rated output (e.g., 0.2/3(6)P, 30/100VA)
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 indoor applications with excellent moisture resistance and compact design. 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.

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 represents the maximum burden the transformer can supply without exceeding temperature rise limits. For JDZX9-35G/210, the thermal limit output is 600VA. This ensures reliable operation even under heavy load conditions in indoor environments.

Standard ratios include 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 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 JDZX9-35G/210 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.

Indoor installation provides protection from environmental factors such as UV radiation, extreme temperatures, pollution, and moisture. This extends equipment life and reduces maintenance requirements. Indoor transformers typically have more compact designs optimized for switchgear and control panel integration.