Overview
The JDZ8-3/6/10R/190 is an indoor epoxy cast-resin voltage transformer with primary fuse protection, designed for 3kV, 6kV, and 10kV medium-voltage systems. It features a compact body (indicated by the “190” structure code) suitable for space-constrained switchgear panels while maintaining reliable secondary voltage output.
It supports applications including voltage measurement, energy metering, monitoring, and relay protection, with accuracy classes typically up to 0.2 / 0.5 / 1.0 combinations. The transformer complies with GB20840.2-2014 and IEC61869-2:2012 standards and operates at 50Hz or 60Hz within an ambient temperature range of -5°C to +40°C.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System Voltage | 3kV, 6kV, 10kV |
| Voltage Class | 3.6kV, 7.2kV, 12kV |
| Frequency | 50Hz / 60Hz |
| Insulation Type | Epoxy cast-resin |
| Primary Protection | With primary fuse |
| Secondary Configurations | Single or dual output |
| Accuracy Classes | 0.2 / 0.5 / 1.0 |
| Ambient Temperature | -5°C to +40°C |
| Installation Type | Indoor switchgear |
| Standards | GB20840.2-2014, IEC61869-2:2012 |
| Weight | Approx. 37.5kg |
| Application | Voltage measurement, metering, monitoring, protection |
Model Designation
- J: Voltage transformer
- D: Single-phase structure
- Z: Epoxy cast-resin insulation
- 8: Design sequence / structure series code
- 3 / 6 / 10: Rated system voltage code for 3kV, 6kV or 10kV applications
- R: With primary fuse
- 190: Structure / outline size code for the compact-width version
Construction
The JDZ8-3/6/10R/190 is constructed with indoor epoxy cast-resin insulation, providing robust dielectric strength and mechanical stability in enclosed switchgear environments. The core and windings are fully encapsulated in epoxy resin, ensuring resistance to moisture, dust, and partial discharge under normal operating conditions. Primary terminals incorporate integrated fuse holders for overcurrent protection, while secondary terminals deliver standardized low-voltage outputs. The compact “190” body design reduces front panel width and depth requirements, making it ideal for modern, space-efficient medium-voltage cabinets.
Technical Parameters
Service Conditions
- Ambient temperature: -5°C to +40°C
- Altitude: ≤ 1000 m above sea level
- Relative humidity: daily average ≤ 95%, monthly average ≤ 90%
- Installation environment: indoor, non-corrosive, free from explosive dust or gas, no severe vibration or shock
Technical Parameters
The JDZ8-3/6/10R/190 is an indoor fused epoxy cast-resin voltage transformer designed for 3.6kV, 7.2kV, and 12kV insulation classes. It operates within a temperature range of -5°C to +40°C at altitudes up to 1000 m, complies with relevant IEC standards, and supports both single and dual secondary configurations for metering and protection applications.
Model Variants
| Type (Ratio) |
Rated Voltage (kV) |
Rated Insulation Level (kV) |
Accuracy Class / Rated Output |
Thermal Limiting Output |
|---|---|---|---|---|
| JDZ8-3R | 3 / 0.1 | 3.6 / 25 / 40 | 0.2 — 30VA 0.5 — 80VA 1.0 — 150VA |
400VA |
| JDZ8-6R | 6 / 0.1 | 7.2 / 32 / 60 | 0.2 — 30VA 0.5 — 80VA 1.0 — 150VA |
400VA |
| JDZ8-10R | 10 / 0.1 | 12 / 42 / 75 | 0.2 — 30VA 0.5 — 80VA 1.0 — 150VA |
400VA |
| JDZ8-3R | 3 / 0.1 / 0.1 | 3.6 / 25 / 40 | 0.2 / 0.2 — 15 / 15VA 0.2 / 0.5 — 15 / 20VA 0.5 / 0.5 — 30 / 30VA |
300VA |
| JDZ8-6R | 6 / 0.1 / 0.1 | 7.2 / 32 / 60 | 0.2 / 0.2 — 15 / 15VA 0.2 / 0.5 — 15 / 20VA 0.5 / 0.5 — 30 / 30VA |
300VA |
| JDZ8-10R | 10 / 0.1 / 0.1 | 12 / 42 / 75 | 0.2 / 0.2 — 15 / 15VA 0.2 / 0.5 — 15 / 20VA 0.5 / 0.5 — 30 / 30VA |
300VA |
Installation & Wiring
Installation Diagram
The JDZ8-3/6/10R/190 voltage transformer is designed for indoor installation on a flat mounting surface using the base dimensions provided. Secure the unit with bolts through the base mounting holes (4-M6 for secondary terminal fixing). Ensure adequate clearance around the unit for ventilation, fuse access, and safe operation. The overall height of 300 ±5mm and front height reference of 261mm should be considered when integrating into switchgear assemblies.
Wiring Diagram
The primary terminals are clearly marked as A and B. Secondary terminals are labeled according to the selected configuration—for example, 1a, 1b, 2a, and 2b—depending on the number of secondary windings ordered. The wiring diagram illustrates both single-phase and three-phase connection arrangements. For three-phase systems, three individual single-phase units are installed and wired in accordance with the switchgear design. Always verify terminal polarity, grounding integrity, and fuse accessibility prior to energizing the system.
Selection & FAQs
Selection Guide
- Match voltage and insulation: choose JDZ8-3R, -6R or -10R for 3kV, 6kV or 10kV line-to-line service and confirm the corresponding insulation level on the nameplate.
- Select the secondary arrangement: use one 100V winding for a shared measuring circuit or dual 100V windings when metering and monitoring must be separated.
- Choose accuracy by burden: single-winding duties are 30VA class 0.2, 80VA class 0.5 or 150VA class 1; dual-winding combinations range from 15/15VA to 30/30VA.
- Coordinate the primary fuse: obtain its voltage, current and breaking-capacity data and coordinate it with prospective fault current, upstream protection and safe replacement access.
- Verify compliance and fit: require the applicable voltage-transformer standard and type-test report, then approve the 190mm body, 300mm height, terminals, clearances and 1000m site limit.
Frequently Asked Questions
Q1: Can this epoxy cast-resin voltage transformer be installed outdoors?
No, it is strictly designed for indoor installation. The environment must be non-corrosive, free from explosive dust, and without severe vibration. Contact us for outdoor-rated alternatives.
Q2: Which accuracy class is suitable for protection relays?
The 1.0 accuracy class with a 150VA rated output is recommended for protection applications. The 0.2 and 0.5 classes are better suited for metering. Confirm your specific burden requirements with our engineering team.
Q3: What is the maximum operating altitude for this transformer?
The maximum rated altitude is 1000 meters above sea level. For installations exceeding this altitude, derating factors apply due to reduced air density. Please provide your exact site elevation for factory verification.
Q4: Are dual secondary windings available for this model?
Yes, the product supports both single and dual secondary configurations. Dual secondaries allow simultaneous metering and protection functions. Specify your required secondary ratio, such as 0.1/0.1 kV, during the inquiry process.
Q5: What factory tests are performed before shipment?
All units undergo routine tests compliant with relevant IEC standards. Specific test reports and type test certificates are subject to confirmation based on your project requirements. Contact our sales team for detailed testing documentation.
Q6: What insulation classes does this indoor voltage transformer support?
This fused epoxy cast-resin model supports 3.6kV, 7.2kV, and 12kV insulation classes. It is ideal for medium-voltage indoor switchgear and metering applications. Select the JDZ8-3R, JDZ8-6R, or JDZ8-10R variant matching your system voltage.