Overview
The JDX-10 is an indoor oil-immersed single-phase voltage transformer rated for 10kV medium-voltage distribution systems. It uses oil-immersed insulation to provide high dielectric strength and stable thermal performance under continuous indoor operation.
Equipped with three separate windings, the JDX-10 delivers 0.2 class accuracy for energy metering, 0.5 class for control system monitoring, and a residual winding for zero-sequence protection. It is suitable for use in indoor substations, industrial facilities, and distribution networks requiring reliable and precise voltage measurement across multiple functions, complying with relevant IEC and national standards for instrument transformers.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System Voltage | 10kV |
| Insulation Type | Oil-immersed |
| Phase Configuration | Single-phase |
| Metering Winding Accuracy | 0.2 class |
| Control Winding Accuracy | 0.5 class |
| Residual Winding | Yes (for zero-sequence protection) |
| Maximum Output Burden | 500VA |
| Installation Environment | Indoor only |
| Frequency | 50/60 Hz |
| Primary Voltage | 10/√3 kV |
| Secondary Voltages | 100/√3 V (metering & control), 100 V (residual) |
| Application Standard | IEC 61869 series |
Construction
The JDX-10 features a robust cast-resin and metal enclosure filled with insulating oil, providing excellent dielectric strength and heat dissipation. The core and windings are fully immersed in transformer oil, which serves as both an insulating and cooling medium. All live parts are sealed within the oil-filled tank to prevent moisture ingress and ensure long-term reliability in indoor environments. The terminal connections are designed for secure wiring to metering, control, and protection circuits, with clear labeling for each secondary winding according to its designated accuracy class and function.
Technical Parameters
Service 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: Oil-immersed
- Frequency: 50Hz or 60Hz
- Connection: Single-phase with three windings
- Maintenance: Periodic oil level and quality inspection recommended
Technical Parameters
The JDX-10 is an indoor oil-immersed single-phase voltage transformer designed for 10kV systems. It operates within an ambient temperature range of -5°C to +40°C and at altitudes up to 1000m (with options for higher altitudes). The unit complies with IEC and GB standards and features a three-winding configuration including a residual voltage winding.
| Type | Rated Voltage
Ration(V) |
Accuracy class and Rated output (VA) | Max. output
(VA) |
||
|---|---|---|---|---|---|
| 0.2 | 0.5 | 3(6)P | |||
| JDZ2-12W | 10000/100 | 40 | 80 | 500 | |
| JDZN2-12W | 10000/√3 : 100/√3 : 100/3 | 30 | 50 | 100 | 500 |
Installation & Wiring
Installation Diagram
The JDX-10 is designed for indoor installation in switchgear or substations with adequate ventilation. Mount the unit vertically on a stable base using the circular bottom flange (width 250mm / 290mm). Ensure clearance around the unit for maintenance access and proper airflow. The top flange (diameter φ330±5mm) provides mounting points for secure fixation.
Wiring Diagram
Connect the primary terminal A to the system voltage source and neutral terminal N to system ground. Secondary terminals supply metering (0.2 class, 20VA), control (0.5 class, 25VA), and residual voltage (50VA) circuits independently. Residual winding terminals (dn) must be connected to a zero-sequence protection relay. Verify all connections match the wiring diagram and that the voltage ratio aligns with system requirements before energizing.
Selection & FAQs
Selection Guide
- Select for 10kV system voltage with 12/42/75kV insulation level.
- Choose accuracy class 0.2 for high-precision metering applications.
- Use accuracy class 0.5 for control and monitoring systems.
- Opt for accuracy class 3P when the transformer is used in protection circuits.
- Match rated output (20, 25, or 50 VA) to the connected burden requirements.
- Specify operating frequency (50Hz or 60Hz) and confirm indoor installation environment.
Frequently Asked Questions
Q1: What accuracy classes are available for this 10kV voltage transformer?
The JDX-10 offers 0.2, 0.5, and 3(6)P accuracy classes. Rated outputs range from 30VA to 100VA, with a maximum output of 500VA. Contact our engineering team to select the exact rating for your application.
Q2: Can this oil-immersed transformer be installed at high altitudes?
The standard JDX-10 is rated for altitudes up to 1000m. For installations above 1000m, custom design options are available. Please provide your exact site altitude during the inquiry for factory confirmation.
Q3: Which secondary winding configuration includes a residual voltage output?
Yes, the three-winding configuration includes a residual voltage winding. The JDZN2-12W model specifically features a 100/3V residual output for earth fault detection. Specify your exact secondary voltage requirements when ordering.
Q4: Are the manufacturing standards compliant with IEC requirements?
Yes, the JDX-10 is manufactured in strict compliance with IEC and GB standards. Factory routine test reports are provided with each shipment. Contact our sales team to request specific type test certificates.
Q5: How are routine factory tests handled before shipment?
Routine tests include ratio, polarity, insulation resistance, and withstand voltage checks. Detailed factory test reports are provided with every shipment to ensure compliance. Contact our quality assurance team for sample test reports.
Q6: Where is this 10kV indoor voltage transformer typically installed?
It is designed for indoor switchgear, substations, and distribution points. The unit operates reliably in 10kV systems within ambient temperatures of -5°C to +40°C. Confirm your specific switchgear dimensions with our engineers before ordering.
Q7: Why choose an oil-immersed design for indoor switchgear applications?
The oil-immersed design provides superior insulation and heat dissipation for continuous operation. It ensures high dielectric strength and stable accuracy within compact indoor environments. Contact our sales team for detailed technical brochures and selection guides.
Q8: Is your company the direct manufacturer of this 10kV instrument transformer?
Yes, we are the direct manufacturer of the JDX-10 single-phase voltage transformer. We provide full OEM/ODM services and direct factory pricing for global distributors. Request our company profile and factory audit reports for verification.