Overview
The JDZX10-6R and JDZX10-10R series are indoor dry-type single-phase voltage transformers with epoxy cast-resin insulation. Designed for medium-voltage systems, they operate at 50Hz or 60Hz and are rated for 6kV (7.2kV class) and 10kV/11kV (12kV class) applications. Each unit features a replaceable primary fuse for enhanced protection and reliability.
These transformers deliver accurate voltage signals for energy measurement, voltage monitoring, and relay protection in indoor switchgear and distribution panels. They comply with international standards including IEC61869-3:2011 and Chinese standard GB20840.3-2013, ensuring performance consistency across global projects requiring fused single-phase VTs.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| Product type | Indoor dry-type single-phase voltage transformer |
| Insulation | Epoxy cast-resin, fully enclosed |
| Primary protection | Replaceable fuse |
| Rated frequency | 50Hz or 60Hz |
| System voltage | 6kV, 10kV, 11kV |
| Voltage class (IEC) | 7.2kV, 12kV |
| Ambient temperature range | -5°C to +40°C |
| Daily average temperature | ≤ +30°C |
| Atmospheric condition | No serious pollution |
| Main functions | Energy metering, voltage monitoring, relay protection |
| Standards | GB20840.3-2013, IEC61869-3:2011 |
Model Designation
- J: Voltage transformer (potential transformer)
- D: Single-phase design
- Z: Cast-resin insulated
- X: With protective fuse on primary side
- 10: Design sequence number
- -6R / -10R: Rated system voltage (6kV or 10kV); R denotes replaceable fuse
- /160: Optional secondary burden rating (e.g., 160VA)
Construction
The JDZX10 series features a robust pillar structure with fully enclosed epoxy cast-resin insulation, providing excellent dielectric strength and environmental resistance. The core and windings are vacuum-cast in epoxy resin under high pressure, ensuring void-free insulation suitable for indoor tropical or humid conditions. The primary winding includes an integrated, easily accessible fuse holder for quick replacement without dismantling the unit. Secondary terminals are securely embedded in the resin body, offering reliable connections for metering and protection circuits. This construction meets stringent requirements for fire resistance, tracking resistance, and long-term operational stability in medium-voltage indoor installations.
Technical Parameters
Service Conditions
- Ambient temperature: -25°C to +40°C
- Altitude: ≤ 1000 m above sea level
- Relative humidity: daily average ≤ 95%, monthly average ≤ 90%
- Installation environment: indoor, non-corrosive, non-explosive, free from conductive dust and severe vibration
Technical Parameters
The JDZX10-6R and JDZX10-10R are fused single-phase cast-resin voltage transformers designed for 7.2kV and 12kV classes respectively. They feature a rated insulation level up to 75kV, operate within -25°C to +40°C ambient temperature at altitudes up to 1000 m, and comply with relevant IEC standards. Maximum output ratings reach 630VA depending on model variant.
Voltage Transformer Data
| Model | Voltage Class |
Rated Voltage Ratio |
Rated Insulation Level (kV) |
Accuracy Class (Protection/ Measurement) |
Rated Output (VA) |
|---|---|---|---|---|---|
| JDZX10-6R | 7.2kV class | 6/√3 : 0.1/√3 : 0.1/3 6.3/√3 : 0.1/√3 : 0.1/3 |
7.2/32/60kV | 0.2/3P—15/100 0.2/6P—15/100 0.5/3P—30/100 0.5/6P—30/100 |
400VA |
| JDZX10-10R | 12kV class | 10/√3 : 0.1/√3 : 0.1/3 11/√3 : 0.11/√3 : 0.1/3 |
12/42/75kV | 1.0/3P—60/100 1.0/6P—60/100 |
630VA |
| JDZX10-6R | 7.2kV class | 6/√3 : 0.1/√3 : 0.1/√3 : 0.1/3 | 7.2/32/60kV | 0.2/0.5/3P—10/10/100 0.2/0.5/6P—10/15/100 |
400VA |
| JDZX10-10R | 12kV class | 10/√3 : 0.1/√3 : 0.1/√3 : 0.1/3 | 12/42/75kV | 0.2/0.5/3P—10/10/100 0.2/0.5/6P—10/15/100 |
630VA |
Installation & Wiring
Installation Diagram
The JDZX10-6R / JDZX10-10R voltage transformer is designed for secure mounting inside switchgear compartments. It features a compact cast-resin insulated body with a primary-side fuse and a base plate equipped with four mounting holes and grounding bolts for stable and safe installation.
Wiring Diagram
The wiring diagram illustrates typical secondary terminal arrangements for metering, monitoring, and residual-voltage applications. Terminal designations may vary depending on the selected ratio, secondary winding configuration (e.g., single output, dual metering/protection, or open-delta for residual voltage), and system protection requirements. Always verify terminal markings against the specific unit’s nameplate and project specifications before connection.
Selection & FAQs
Selection Guide
- Match the exact ratio: select 6/√3kV or 6.3/√3kV for JDZX10-6R, and 10/√3kV or the separately confirmed 11kV ratio for JDZX10-10R.
- Choose the winding package: use one measuring winding plus protection, or dual measuring windings when class 0.2 metering and class 0.5 monitoring require separate circuits.
- Specify the protection duty: select 3P or 6P at 100VA and confirm the three-unit star/open-delta connection, relay voltage, rated voltage factor and duration.
- Coordinate fuse and output: obtain the replaceable primary-fuse ratings and treat 400VA or 630VA only as thermal limits, not accuracy burdens.
- Approve test and installation documents: verify the exact terminal diagram, 11kV secondary values, temperature range, mounting/fuse access and manufacturer-approved dielectric test procedure.
Frequently Asked Questions
Q1: Which model offers the highest rated output capacity?
The JDZX10-10R provides a maximum rated output of 630VA for 12kV class systems. The JDZX10-6R offers up to 400VA. Contact us to specify your exact burden requirements.
Q2: Can these single-phase voltage transformers be installed outdoors?
No, they are strictly designed for indoor installation. The environment must be non-corrosive, non-explosive, and free from conductive dust or severe vibration. Confirm your switchgear specs with our engineering team.
Q3: What accuracy classes are available for protection relay applications?
The JDZX10-6R offers 3P and 6P protection classes with rated outputs up to 100VA. The JDZX10-10R also supports 3P and 6P classes. Specify your required accuracy and burden during ordering.
Q4: Are these cast-resin transformers compliant with international IEC standards?
Yes, both models comply with relevant IEC standards for cast-resin voltage transformers. The JDZX10-10R reaches an insulation level of 12/42/75kV for 12kV systems. Request the compliance certificate for your specific region.
Q5: How are the rated voltage ratios customized for specific grids?
Custom voltage ratios are available subject to factory confirmation. Standard options include 6/√3 and 10/√3 configurations for secondary windings. Provide your exact primary and secondary voltage requirements to our sales team.
Q6: Do you provide third-party certification for these transformers?
Standard routine tests include ratio, polarity, and insulation resistance checks per IEC standards. Specific type tests or third-party certifications are subject to confirmation. Request the test certificate package during the inquiry stage.
Q7: When should the JDZX10-10R be selected over the 6R model?
The JDZX10-10R should be selected for 12kV class systems requiring up to 630VA output. The JDZX10-6R is suited for 7.2kV applications up to 400VA. Verify your system voltage class before finalizing the order.