Overview
The JDZX9-20 and JDZX11-20 are indoor single-phase voltage transformers rated for 15kV and 20kV AC power systems. They feature epoxy cast-resin insulation, providing high dielectric strength, moisture resistance, and mechanical robustness for reliable operation in indoor switchgear environments.
These transformers support multiple accuracy classes—0.2, 0.5, 1.0, 3P, and 6P—making them suitable for precision metering, general voltage measurement, and protective relaying applications. Designed in compliance with GB20840.3-2013 and IEC 61869-3:2011 standards, they ensure interoperability and safety in industrial and utility distribution networks.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System Voltage | 15kV / 20kV |
| Primary Voltage | 15 / √3 kV, 20 / √3 kV |
| Secondary Voltage | 100 / √3 V |
| Accuracy Classes | 0.2, 0.5, 1.0, 3P, 6P |
| Rated Frequency | 50 Hz |
| Insulation Type | Epoxy cast-resin |
| Application | Indoor |
| Phase | Single-phase |
| Standards | GB20840.3-2013, IEC 61869-3:2011 |
| Weight | Approx. 42.4 kg |
Construction
The JDZX9-20 and JDZX11-20 transformers employ a fully encapsulated epoxy cast-resin construction, which integrates the primary and secondary windings into a solid, void-free insulation system. This design ensures excellent partial discharge performance, long-term thermal stability, and resistance to environmental contaminants such as dust and humidity. The core is made of high-permeability grain-oriented silicon steel, minimizing losses and enhancing accuracy under varying load conditions. Terminals are embedded within the resin body for secure connections, and the compact arch-type housing allows for space-efficient mounting in metal-enclosed switchgear assemblies.
Technical Parameters
Service Conditions
- Ambient Temperature: -5°C to +40°C
Technical Parameters
The JDZX9-20 and JDZX11-20 are indoor epoxy cast-resin voltage transformers designed for 15 kV and 20 kV systems, featuring high insulation levels and compliance with GB20840.3-2013 and IEC 61869-3:2011 standards. They operate within an ambient temperature range of -5°C to +40°C and are suitable for standard indoor installation environments.
Voltage Transformer Data
| Rated Voltage (kV) |
Rated Insulation Level (kV) |
Accuracy Class / Output (VA) |
Rated Output (VA) |
|---|---|---|---|
| 15/√3 | 17.5/55/105 | 0.2-30 / 0.5-100 0.5-80 / 1.0-100 3P-30 / 6P-100 |
600 |
| 20/√3 | 24/65/125 | 0.2-30 / 0.5-100 0.5-80 / 1.0-100 3P-30 / 6P-100 |
600 |
| 15/√3 : 0.1/√3 : 0.1/√3 : 0.1/3 | 17.5/55/105 | 0.2/0.5/3P-30/30/100 | 600 |
| 20/√3 : 0.1/√3 : 0.1/√3 : 0.1/3 | 24/65/125 | 0.2/0.5/6P-30/30/100 | 600 |
Installation & Wiring
Installation Diagram
The JDZX9-20 and JDZX11-20 voltage transformers are installed using a metal base plate with four M6 mounting holes. Secure the unit to a flat, stable surface to ensure mechanical stability and proper alignment during operation.
Wiring Diagram
Primary terminals connect directly to the high-voltage system. Secondary windings provide isolated outputs for metering and protection circuits, with terminal markings corresponding to standard wiring configurations: star (Y) connection for three-phase systems with grounded neutral, open delta for residual voltage detection, and multiple secondary options for simultaneous applications.
Selection & FAQs
Selection Guide
- Select accuracy class 0.2 for revenue metering applications requiring high precision; use class 0.5 or lower for general monitoring.
- Ensure the transformer is used only in indoor environments, as it is not rated for outdoor exposure despite its moisture-resistant epoxy cast-resin construction.
- Verify that the required voltage ratio and output burden match your system needs—custom ratios are available upon request.
- For three-phase systems, deploy three identical units in a star (Y) configuration with grounded neutral and phase-to-ground primary connections.
- Confirm ambient operating temperature stays within -5°C to +40°C to maintain reliable performance in indoor substations or industrial settings.
Frequently Asked Questions
Q1: What systems are these epoxy voltage transformers designed for?
They are designed for 15 kV and 20 kV indoor systems. The JDZX9-20 and JDZX11-20 models feature high insulation levels compliant with IEC 61869-3:2011. Verify exact system voltage with our engineering team.
Q2: Which accuracy class is available for measurement and protection?
Measurement classes 0.2 and 0.5, alongside protection classes 3P and 6P are available. Each transformer satisfies only one accuracy class with a maximum rated output of 600 VA. Contact us to specify your required class.
Q3: What are the ambient temperature limits for indoor installation?
The standard operating ambient temperature range is -5°C to +40°C. These epoxy cast-resin transformers are strictly intended for standard indoor switchgear environments. Confirm specific site conditions if temperatures exceed these limits.
Q4: What are the rated insulation levels for 20kV models?
The 20/√3 kV models feature a rated insulation level of 24/65/125 kV. This ensures reliable performance in 20 kV networks per GB20840.3-2013 standards. Request the detailed type test report for specific project requirements.
Q5: Can the rated voltage ratios be customized for specific projects?
Yes, custom specifications are available if standard parameters do not meet your needs. Standard ratios include 15/√3 and 20/√3 kV primary voltages. Please submit your exact technical requirements for manufacturer evaluation.
Q6: Which international standards do these voltage transformers comply with?
They fully comply with IEC 61869-3:2011 and GB20840.3-2013 standards. These certifications ensure global compatibility for indoor medium-voltage applications. Contact our sales team for copies of standard compliance certificates.
Q7: Can these epoxy voltage transformers be used outdoors?
No, the JDZX9-20 and JDZX11-20 are strictly designed for indoor environments. They feature epoxy cast-resin insulation optimized for indoor switchgear and control panels. Specify indoor installation when requesting a quotation.