Overview
The JDZ11-3/6/10A and JDZX11-10GA-185 are indoor epoxy cast-resin voltage transformers designed for 3kV, 6kV, and 10kV AC power systems. These single-phase devices convert high primary voltages into standardized secondary signals (typically 100V or 100/√3 V) for use in metering, protection, and monitoring applications.
They comply with IEC 61869 standards and offer accuracy classes suitable for both metering (e.g., 0.2, 0.5) and protection (e.g., 3P, 6P). The JDZ11-A models support phase-to-phase voltage measurement, while the JDZX11-G variants enable phase-to-ground and residual-voltage detection. Their robust cast-resin insulation ensures reliable operation in indoor switchgear, distribution cabinets, and metering panels without the maintenance requirements of oil-immersed designs.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System Voltage | 3kV / 6kV / 10kV |
| Primary Voltage | 3kV, 6kV, or 10kV (phase-to-phase or phase-to-ground) |
| Secondary Voltage | 100V or 100/√3 V |
| Frequency | 50Hz or 60Hz |
| Accuracy Class (Metering) | 0.2, 0.5 |
| Accuracy Class (Protection) | 3P, 6P |
| Insulation Type | Epoxy cast-resin |
| Installation Environment | Indoor only |
| Winding Configuration | Single or dual secondary windings (JDZX11-G may include residual winding) |
| Thermal Class | E (120°C) |
| Short-Time Withstand Voltage | Per IEC 61869 (based on system voltage class) |
| Creepage Distance | Compliant with indoor pollution degree 2 |
Construction
The JDZ11 and JDZX11 series feature a solid epoxy cast-resin insulation structure, providing excellent dielectric strength, mechanical stability, and resistance to environmental factors such as humidity and dust. The core and windings are fully encapsulated in self-extinguishing epoxy resin under vacuum conditions, eliminating internal air voids and preventing partial discharges. This construction ensures long-term reliability in indoor medium-voltage environments without the need for oil filling or periodic maintenance. The compact design allows for easy integration into standard switchgear and metering compartments, with terminal blocks accessible from the front or top depending on installation orientation.
Technical Parameters
Service Conditions
- Ambient temperature: -25°C to +40°C
- Altitude: Not exceeding 1000 m above sea level
- Relative humidity: Daily average not more than 95%, monthly average not more than 90%
- Installation environment: Indoor, non-corrosive gas, non-explosive, no severe vibration or shock
- Rated frequency: 50Hz or 60Hz
Technical Parameters
The JDZ11-3/6/10A and JDZX11-3/6/10G series are indoor epoxy cast-resin voltage transformers designed for metering, monitoring, and protection applications. They operate at rated voltage classes of 3kV, 6kV, and 10kV with a standard ambient temperature range of -25°C to +40°C and are suitable for installation up to 1000 m altitude.
Technical Reference
| Type | Rated Voltage |
Insulation Level (kV) |
Accuracy Class & Rated Output |
Max. Output (VA) |
|---|---|---|---|---|
| JDZX11-6GA/185 | 6/√3:0.1/√3:0.1/3 | 7.2/32/60 | 0.2/3P—50/100 0.2/6P—50/100 0.5/3P—150/100 0.5/6P—150/100 1.0/6P—300/100 |
800 |
| 6/√3:0.1/√3:0.1/√3:0.1/3 | 0.2/0.5/3P—20/40/100 0.2/0.5/6P—20/40/100 0.2/0.5/3P—30/30/100 0.2/0.5/6P—30/30/100 |
800 | ||
| JDZX11-10GA/185 | 10/√3:0.1/√3:0.1/3 | 10/42/75 | 0.2/3P—50/100 0.2/6P—50/100 0.5/3P—150/100 0.5/6P—150/100 1.0/6P—300/100 |
800 |
| 10/√3:0.1/√3:0.1/√3:0.1/3 | 0.2/0.5/3P—20/40/100 0.2/0.5/6P—20/40/100 0.2/0.5/3P—30/30/100 0.2/0.5/6P—30/30/100 |
800 |
Installation & Wiring
Wiring Diagram
Primary and secondary wiring must be executed strictly in accordance with the approved wiring diagram. For JDZX11-G models, the residual-voltage winding terminals must be connected as specified by the protection scheme. All secondary terminal markings should be verified against the wiring diagram prior to commissioning to ensure correct polarity and function.
Selection & FAQs
Selection Guide
- Select JDZ11-A for phase-to-phase voltage measurement and standard metering applications; choose JDZX11-G for phase-to-ground voltage, residual-voltage detection, or combined metering/protection windings.
- Match the model to your system voltage: JDZ11-3A/JDZX11-3G for 3kV, JDZ11-6A/JDZX11-6G for 6kV, and JDZ11-10A/JDZX11-10G for 10kV systems.
- Choose accuracy class based on application: 0.2 or 0.5 for precision metering, class 1 for general indication, and 3P/6P for protection circuits.
- Ensure the rated output exceeds the total secondary burden, including meters, relays, wiring losses, and other connected devices.
- Verify installation dimensions—including mounting holes, terminal box position, primary terminal direction, and internal clearance—before ordering.
Frequently Asked Questions
Q1: Can these voltage transformers be installed outdoors?
No, the JDZ11 and JDZX11 series are strictly designed for indoor installation. They require a non-corrosive, non-explosive environment free from severe vibration. Contact us for outdoor epoxy resin alternatives.
Q2: Which accuracy class is suitable for protection relays?
Select 3P or 6P accuracy classes for protection applications. These classes ensure reliable performance during fault conditions with rated outputs up to 100VA. Specify your exact relay burden during ordering.
Q3: What is the maximum insulation level for the 6kV models?
The JDZX11-6GA/185 models feature a maximum insulation level of 7.2/32/60 kV. This ensures adequate dielectric strength for 6kV indoor switchgear systems. Please confirm specific system requirements with our engineering team.
Q4: What factory tests are performed before shipment?
Standard routine tests are performed per applicable standards, subject to confirmation. Specific type tests or third-party certifications require advance notice. Contact our quality team for detailed test reports.
Q5: Can the rated output be customized beyond 800VA?
Custom output ratings are subject to factory confirmation. The standard maximum output for the listed models is 800VA. Please provide your detailed technical specifications for a customized quotation.
Q6: What applications are the JDZ11 series epoxy transformers used for?
These cast-resin voltage transformers are primarily used for metering, monitoring, and protection in 3kV, 6kV, and 10kV indoor power systems. They integrate seamlessly into standard switchgear and control panels.
Q7: Do these indoor voltage transformers support 60Hz power systems?
Yes, the JDZ11 and JDZX11 series operate at both standard 50Hz and 60Hz rated frequencies. Ensure you specify the required system frequency when placing your order.