Product Overview
The JD2-24W and JDX2-24W voltage transformers are outdoor oil-immersed single-phase measurement devices engineered for 24kV high-voltage power systems. The oil-immersed insulation system provides exceptional thermal dissipation for continuous operation in outdoor environments. The series includes JD2-24W for standard voltage transformation and JDX2-24W with residual voltage winding for ground fault detection.
Multiple configurations available: JD2-24W (20/0.1kV or 20/0.1/0.1kV) for standard voltage transformation with 800VA or 400VA thermal limit output, or JDX2-24W (20/√3 : 0.1/√3 : 0.1/3kV or 20/√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, 3P, 6P) accommodate precision metering to protection requirements. Operating temperature -5°C to +40°C, compliant with GB20840.3-2013 and IEC61869-3:2011 standards.
Product Display
Application Position
The JD2-24W/JDX2-24W is installed in outdoor substations, high-voltage switching stations, and distribution networks where reliable voltage measurement is required. The oil-immersed insulation system provides exceptional thermal dissipation for continuous operation. Typical installation includes concrete foundation mounting with proper grounding and clearance for maintenance access.
Main Applications
- 24kV outdoor substations
- High-voltage distribution line voltage monitoring
- Industrial power distribution systems
- Renewable energy substations
- Rural electrification projects
- Utility networks requiring ground fault detection (JDX2-24W)
Application Case Studies
Application Scenario 1: 24kV Distribution Network Voltage Measurement
Utilities deploy JD2-24W oil-immersed voltage transformers in 24kV outdoor substations for reliable voltage measurement. The oil-immersed insulation system provides exceptional thermal dissipation, allowing the transformer to operate reliably in ambient temperatures ranging from -5°C to +40°C. The 800VA thermal limit output ensures reliable performance under heavy burden conditions.
Application Scenario 2: Ground Fault Detection in Distribution Networks
The JDX2-24W model with residual voltage winding (20/√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.
Application Fit
Suitable For
- Outdoor 24kV voltage measurement applications
- High thermal capacity requirements (800VA limit output)
- Continuous operation in outdoor environments
- Ground fault detection applications (JDX2-24W model)
- High-voltage distribution networks
Not Recommended For
- Indoor installation applications (use indoor-rated models)
- Current measurement applications (use CT instead)
- High-voltage systems above 24kV (use higher voltage class models)
- Applications requiring maintenance-free operation (use epoxy cast-resin models)
Installation Conditions
- Installation position: Outdoor substations, switching stations, or distribution networks
- Ambient temperature: -5°C to +40°C
- Altitude: ≤ 1000m (standard), higher altitude available on request
- Insulation: Oil-immersed
- Frequency: 50Hz or 60Hz
- Phase configuration: Single-phase (use three units for three-phase systems)
- Maintenance: Periodic oil testing and seal inspection required
Technical Parameters
The JD2-24W/JDX2-24W series includes outdoor oil-immersed single-phase voltage transformers for 24kV systems. Operating temperature -5°C to +40°C, compliant with GB20840.3-2013 and IEC61869-3:2011 standards.
| Model | Rated Voltage Ratio (kV) |
Accuracy Class & Rated Output (VA) |
Thermal Limit Output (VA) |
Insulation Level (kV) |
|---|---|---|---|---|
| JD(X)W2-20 (20/0.1) |
20/0.1 | 0.2: 40 0.5: 100 |
800 | 24/65/125 |
| JD(X)W2-20 (20/0.1/0.1) |
20/0.1/0.1 | 0.2/0.2: 20/20 0.2/0.5: 20/30 0.5/0.5: 30/30 |
400 | 24/65/125 |
| JD(X)W2-20 (20/√3:0.1/√3:0.1/3) |
20/√3 : 0.1/√3 : 0.1/3 | 0.2/6P(3P): 20/100 0.5/6P(3P): 60/100 |
600 | 24/65/125 |
| JD(X)W2-20 (20/√3:0.1/√3:0.1/√3:0.1/3) |
20/√3 : 0.1/√3 : 0.1/√3 : 0.1/3 | 0.2/0.2/6P(3P): 15/15/100 0.2/0.5/6P(3P): 15/20/100 |
300 | 24/65/125 |
Note 1: Rated output and its relative accuracy class only one alternative per transformer.
Note 2: If user’s data go beyond the above-mentioned scopes, they may be subject to an agreement between manufacturer and purchaser.
Installation
Dimension Reference
Overall dimensions: Height 752±2mm, Top width 402mm, Base width 310mm, Tank height 345mm. Weight: approximately 84kg. Insulator angle: 19° from vertical. Mounting: Base mounting feet with bolt holes. Clearance: Minimum 600mm around transformer for maintenance access.
Wiring Diagram
JD2-24W supports single-phase and three-phase connections. Primary terminals A, B connect to 24kV system. Secondary outputs 1a-1b and 2a-2b for metering and protection. JDX2-24W includes residual voltage winding with open-delta connection (da, dn) for ground fault detection. Ensure proper polarity and phase sequence during installation.
Installation Guidelines
- Foundation: Install on a level concrete foundation capable of supporting 84kg weight. Foundation should be 150mm above ground level to prevent water accumulation.
- 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.
- Clearance: Maintain minimum 600mm clearance on all sides for maintenance access and ventilation.
- Primary Connection: Connect primary terminals (A, B) to the 24kV power system using appropriate high-voltage conductors or busbars.
- Secondary Connection: Connect secondary terminals to metering devices, protection relays, or monitoring equipment according to the wiring diagram.
- Oil Level Check: Before energizing, check the oil level indicator to ensure proper oil level.
- Commissioning Tests: Perform insulation resistance test, turns ratio test, polarity test, and oil dielectric strength test before energizing.
Oil-Immersed Insulation Features
- Superior Thermal Dissipation: Oil-immersed insulation provides exceptional thermal dissipation, allowing the transformer to operate at higher burden levels without exceeding temperature limits.
- High Thermal Capacity: The oil-immersed design provides high thermal capacity (800VA thermal limit output), enabling continuous operation under heavy burden conditions.
- Fully Enclosed Construction: The fully enclosed oil box prevents oil aging by minimizing exposure to air and moisture.
- Excellent Dielectric Strength: Transformer oil provides excellent dielectric strength, ensuring reliable insulation between windings and from windings to ground.
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 JD2-24W/JDX2-24W voltage transformer, consider the following factors:
- Model Selection: Choose JD2-24W for standard voltage measurement, or JDX2-24W with residual voltage winding for ground fault detection
- Accuracy Class: Choose 0.2 for revenue metering, 0.5 for monitoring applications, 3P/6P for protection applications
- Burden Requirements: Ensure the rated output matches the connected load to maintain accuracy
- Environmental Conditions: Verify ambient temperature (-5°C to +40°C), altitude (≤1000m standard) match your installation environment
- Ground Fault Detection: If ground fault detection is required, select JDX2-24W model with residual voltage winding
Ordering Information
When ordering the JD2-24W/JDX2-24W voltage transformer, please specify:
- Model: JD2-24W or JDX2-24W
- Rated voltage ratio (e.g., 20/0.1kV or 20/√3 : 0.1/√3 : 0.1/3kV)
- Accuracy class and rated output (e.g., 0.2-40VA or 0.5/6P(3P)-60/100VA)
- Rated frequency (50Hz or 60Hz)
- Quantity required
- Any special requirements or custom specifications