JDZ9-35Q JDZXF9-35Q JDZX9-35kV Indoor Epoxy Cast-Resin Voltage Transformer

Product Overview

The JDZ9-35Q JDZXF9-35Q JDZX9-35Qvoltage 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 JDZ9-35Q series delivers precise voltage measurement for energy metering, voltage monitoring, and relay protection applications with multiple accuracy classes (0.2, 0.5, 1.0) and various winding configurations. The epoxy resin cast construction ensures superior insulation performance with 40.5/95/200kV insulation level while providing up to 600VA thermal limit output capacity. Compact design with 107kg weight simplifies installation and reduces structural support requirements.

Product Display

JDZ9-35Q voltage transformer details
JDZ9-35Q voltage transformer poster 1

Application Position

The JDZ9-35Q series 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. Units are typically connected in three-phase configuration with star-connected primary and secondary windings for accurate voltage measurement and protection.

Main Applications

35kV indoor distribution networks
Substations requiring voltage measurement
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
Utilities deploy JDZ9-35Q epoxy cast-resin voltage transformers in 35kV indoor substations for energy metering and protection. The multiple model variants (JDZ9-35Q, JDZF9-35Q, JDZX9-35Q, JDZXF9-35Q) provide flexibility for different measurement requirements, from basic single-winding to complex multi-winding configurations. The epoxy resin insulation ensures reliable performance in indoor environments with 40.5/95/200kV 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 JDZ9-35Q series offers multiple accuracy classes (0.2, 0.5, 1.0) to meet different measurement requirements, with up to 600VA thermal limit output capacity for various burden conditions. The compact design simplifies installation in space-constrained switchgear panels.

Application Fit

Suitable For

Indoor 35kV voltage measurement
Substations with metering and protection 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 JDZ9-35Q series includes four model variants for different measurement and protection requirements. All models feature indoor epoxy cast-resin construction for 35kV systems. Operating temperature -5°C to +40°C, compliant with GB20840.1.3 and IEC61869-1.3 standards.

Model	Rated Voltage (kV)	Accuracy Class & Rated Output (VA)	Thermal Limit Output (VA)	Insulation Level (kV)
JDZ9-35Q	35/0.1	0.2: 50 0.5: 120 1.0: 250	600	40.5/95/200
JDZF9-35Q	35/0.1/0.1	0.2: 20 0.5: 40 1.0: 60	2×300	40.5/95/200
JDZX9-35Q	35/√3 : 0.1/√3 : 0.1/3	0.2/3P(6P): 30 0.5/3P(6P): 60 1.0: 150	600	40.5/95/200
JDZXF9-35Q	35/√3 : 0.1/√3 : 0.1/√3 : 0.1/3	0.2/0.5/3P(6P): 15/20/100	2×300	40.5/95/200

Note 1: JDZ9-35Q – Single secondary winding for basic voltage measurement.

Note 2: JDZF9-35Q – Dual secondary windings for separate metering and protection circuits.

Note 3: JDZX9-35Q – Single-phase with residual voltage winding for ground fault detection.

Note 4: JDZXF9-35Q – Enhanced configuration with dual secondary and residual voltage windings.

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

JDZ9-35Q voltage transformer dimension drawing

Overall dimensions: Top width 390mm, base width 545mm, height 495mm. Weight: approximately 107kg. Mounting holes: 4-φ13 on base plate.

Wiring Diagram

JDZ9-35Q voltage transformer wiring diagram

Single-phase connection: Primary terminals A, B; Secondary terminals 1a-1b (metering), 2a-2b (protection). Three-phase V-connection available for open-delta configuration.

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 107kg 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, B) 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 40.5/95/200kV
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

GB20840.1.3 (Instrument transformers – Part 3: Inductive voltage transformers)
IEC61869-1.3 (Instrument transformers – Part 3: Inductive voltage transformers)
Customer-specific requirements available on request

Selection Guide

When selecting the JDZ9-35Q series voltage transformer, consider the following factors:

Model Selection: Choose JDZ9-35Q for basic measurement, JDZF9-35Q for dual secondary, JDZX9-35Q for ground fault detection, or JDZXF9-35Q for comprehensive protection
Accuracy Class: Choose 0.2 for revenue metering, 0.5 for monitoring applications, 1.0 for general measurement, 3P(6P) for protection applications
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 JDZ9-35Q series voltage transformer, please specify:

Model: JDZ9-35Q / JDZF9-35Q / JDZX9-35Q / JDZXF9-35Q
Rated voltage ratio (e.g., 35/0.1 kV)
Accuracy class and rated output (e.g., 0.2, 50VA)
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 JDZ9-35Q, 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 JDZ9-35Q 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.

JDZ9-35Q JDZXF9 35kV Indoor Epoxy Cast-Resin Voltage Transformer