Product Overview
The JDJ series oil-immersed single-phase voltage transformer is designed for 3kV, 6kV, 10kV and 12kV medium-voltage systems operating at 50Hz. This precision measurement device provides accurate voltage signals for metering and relay protection applications in both indoor and outdoor installations.
The JDJ series features oil-immersed insulation with primary and secondary windings mounted on the same ring-shaped core, delivering reliable performance with multiple accuracy classes (0.2, 0.5, 1, 3) and rated outputs from 20VA to 320VA. The compact 46.5kg construction simplifies installation while maintaining excellent electrical characteristics for power system protection.
Product Display
Application Position
The JDJ series is installed in indoor switchgear, outdoor substations, and distribution networks where single-phase voltage measurement is required. The oil-immersed insulation provides excellent dielectric strength and thermal performance for continuous operation in power systems.
Main Applications
- 3kV, 6kV, 10kV and 12kV voltage measurement systems
- Relay protection voltage input
- Indoor and outdoor substation metering
- Power quality monitoring applications
- Industrial facilities with medium-voltage supply
- Distribution network voltage monitoring
Application Case Studies
Application Scenario 1: Substation Protection
Utilities deploy the JDJ series voltage transformer in medium-voltage substations for relay protection input. Two transformers connected in V-configuration provide line voltage measurement for overvoltage and undervoltage protection, ensuring reliable system operation and fault detection.
Application Scenario 2: Industrial Voltage Monitoring
Industrial facilities with 6kV or 10kV incoming supply require accurate voltage measurement for power quality monitoring and process control. The JDJ series offers multiple accuracy classes to meet different measurement requirements, with rated outputs up to 320VA for various burden conditions.
Application Fit
Suitable For
- 3kV, 6kV, 10kV and 12kV voltage measurement
- Relay protection voltage input
- Indoor and outdoor substation installations
- Power quality monitoring applications
- Industrial medium-voltage systems
- Environments with altitude ≤1000m
Not Recommended For
- Three-phase measurement applications (use three-phase PT instead)
- High-altitude installations above 1000m
- Systems requiring accuracy better than 0.2 class
- Applications requiring maintenance-free dry-type design
Installation Conditions
- Installation position: Indoor switchgear or outdoor substation
- Ambient temperature: -5°C to +40°C
- Altitude: ≤ 1000m
- Relative humidity: ≤ 85% at 20°C
- Insulation: Oil-immersed
- Frequency: 50Hz
- Vibration: Passed 0.4g intensity test
Technical Parameters
The JDJ series is an oil-immersed single-phase voltage transformer for 3kV, 6kV, 10kV and 12kV systems. Operating temperature -5°C to +40°C, altitude up to 1000m. Features oil-immersed insulation, multiple accuracy classes, and compact 46.5kg construction.
VT Data
| Type | Rated Voltage Ratio (V) |
Accuracy Class 0.2 / 0.5 / 1 / 3 |
Rated Output (VA) |
Limit Output (VA) |
Power Frequency Voltage (kV) |
|---|---|---|---|---|---|
| JDJ-3 | 3000/100 | 20 / 30 / 50 / 120 | 240 | 24 | |
| JDJ-6 | 6000/100 | 30 / 50 / 80 / 200 | 400 | 32 | |
| JDJ-10 | 10000/100 | 40 / 80 / 150 / 320 | 640 | 42 | |
| JDJ-12 | 11000/110 | 40 / 80 / 150 / 320 | 640 | 42 |
Weight: 46.5 kg (all models)
Installation
Dimension Reference
| View | Key Dimensions |
Application Note |
|---|---|---|
| Front View | Spacing 160±5mm; Height 250mm | Two insulators with nameplate |
| Side View | Total height 450±15mm | Profile with mounting base |
| Top View | 270 x 230mm | Two bushings (N and A) |
| Base | 230 x 205mm; Ø10×4 holes | Mounting footprint |
Wiring Diagram
Installation Guidelines
- Install in indoor switchgear or outdoor substation with adequate ventilation
- Connect primary terminals A and N to voltage system through fuses
- Connect secondary terminals a and n to meters and protection devices
- Ensure proper grounding of secondary circuit neutral point (n terminal)
- Verify voltage ratio matches system requirements before commissioning
- Check oil level and insulation resistance before energizing
- For three-phase measurement, connect two transformers in V-configuration
Oil-Immersed Features
The JDJ series incorporates oil-immersed insulation technology including:
- Excellent dielectric strength for high-voltage applications
- Superior thermal performance for continuous operation
- Primary and secondary windings on same ring core for compact design
- Reliable performance in both indoor and outdoor environments
Standards
The JDJ series oil-immersed voltage transformer complies with Chinese standards for voltage transformers, ensuring compatibility with domestic medium-voltage measurement applications.
Selection Guide
Select by system voltage: Choose JDJ-3 for 3kV, JDJ-6 for 6kV, JDJ-10 for 10kV, or JDJ-12 for 12kV systems.
Select by accuracy class: Use 0.2 for high-precision metering, 0.5 for standard metering, 1 for general measurement, or 3 for indication purposes.
Select by rated output: Choose rated output (20-320VA) based on connected burden requirements.
Select by winding configuration: Choose single secondary winding or double secondary winding based on application requirements.
Ordering Information
When ordering the JDJ series oil-immersed voltage transformer, please specify:
- Model: JDJ-3, JDJ-6, JDJ-10, or JDJ-12
- System voltage: 3kV, 6kV, 10kV, or 12kV
- Accuracy class: 0.2, 0.5, 1, or 3
- Rated output: Specify VA value from table
- Winding configuration: Single or double secondary winding
- Installation type: Indoor or outdoor
- Quantity
FAQs