Overview
The JDZ-3/6/10(W) and JDZF-10 are single-phase indoor semi-enclosed epoxy cast-resin voltage transformers rated for 3kV, 6kV, and 10kV AC power systems. They feature a robust epoxy resin insulation system that encapsulates the core and windings, providing reliable dielectric performance and environmental protection suitable for indoor switchgear applications.
These transformers deliver standardized secondary outputs (typically 100V) with accuracy classes such as 0.2, 0.5, or 1.0, depending on the model and configuration. They are designed for use in voltage metering, energy monitoring, relay protection, and control circuits in compliance with IEC 61869 and other relevant medium-voltage equipment standards.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| Primary Voltage | 3kV / 6kV / 10kV |
| Secondary Voltage | 100V (standard) |
| Accuracy Class | 0.2 / 0.5 / 1.0 (model-dependent) |
| Frequency | 50Hz or 60Hz |
| Insulation Type | Semi-enclosed epoxy cast-resin |
| Phase | Single-phase |
| Installation | Indoor only |
| Thermal Class | B (130°C) |
| Short-Time Withstand Voltage | Per IEC 61869 |
| Secondary Burden Rating | Typically 10–50 VA |
| Polarity | Subtractive |
| Protection Class | IP00 (requires enclosure) |
Model Designation
- J: Voltage transformer
- D: Single-phase structure
- Z: Epoxy cast-resin insulation
- F: Special secondary or structural variant (JDZF models)
- 3 / 6 / 10: Rated voltage class (3kV, 6kV, or 10kV)
- W: Anti-pollution or manufacturer-specific product variant
Construction
The transformer employs a semi-enclosed epoxy cast-resin construction, where the magnetic core and primary/secondary windings are fully encapsulated in flame-retardant epoxy resin for enhanced mechanical strength and moisture resistance. The primary and secondary terminals are exposed for connection but protected by the surrounding resin body. The base includes mounting provisions compatible with standard indoor switchgear panels. This design eliminates the need for oil insulation, making it maintenance-free and suitable for fire-sensitive indoor environments such as distribution rooms and metering cabinets.
Technical Parameters
Service Conditions
- Altitude: not over 1000m
- Ambient temperature: maximum +40°C, minimum -5°C
- Relative humidity: less than 85% at 20°C
- Vibration resistance: The product has passed direct vibration testing with an intensity of 0.4g three-sine waves according to the product sample statement.
- Pollution conditions: The product can be used under pollution conditions according to the sample description.
- Installation environment: Indoor and suitable for medium-voltage cast-resin equipment.
Technical Parameters
The JDZ-3/6/10(W) and JDZF-10 series are indoor semi-enclosed epoxy cast-resin voltage transformers designed for 50Hz medium-voltage systems with rated voltage classes of 3kV, 6kV, and 10kV. They operate within an ambient temperature range of -5°C to +40°C and at altitudes not exceeding 1000m, offering accuracy classes from 0.2 to 3 and outputs up to 500VA.
| Type | JDZ-3(W) | JDZ-6(W) | JDZ-10(W) | |
|---|---|---|---|---|
| Voltage Ratio(V) |
1000/100 2000/100 3000/100 |
6000/100 | 10000/100 | |
| Frequency (Hz) |
50 | 50 | 50 | |
| Rated output(VA) |
for accuracy class 0.5 | 30 | 50 | 80 |
| for accuracy class 1 | 50 | 80 | 150 | |
| for accuracy class 3 | 80 | 200 | 300 | |
| Max. output(VA) |
200 | 400 | 500 | |
| Insulation level(kV) |
3.5/23/40 | 6.9/32/60 | 11.5/42/75 |
| Type | Voltage Ratio(V) |
Frequency (Hz) |
Rated output Class (VA) |
Max. output(VA) |
Insulation level(kV) |
|||
|---|---|---|---|---|---|---|---|---|
| 0.2 | 0.5 | 0.2/0.2 | 0.5/0.5 | |||||
| JDZ-10(W) | 10000/100 | 50 | 30 | 80 | 25/25 | 50/50 | 200 | 11.5/42/75 |
Installation & Wiring
Installation Diagram
The JDZ / JDZF series voltage transformers must be installed in accordance with the approved outline drawing, wiring diagram, and switchgear layout. Prior to installation, verify the mounting base dimensions, terminal orientation, bushing clearance, secondary terminal location, and ensure adequate space is reserved for maintenance and safe operation.
Selection & FAQs
Selection Guide
- Match the exact ratio: choose the direct primary-to-100V winding that matches the actual 3kV, 6kV or 10kV line voltage.
- Select JDZ or JDZF: use JDZ for one measuring circuit and JDZF-10(W) when two isolated 100V secondary circuits are required.
- Correct the JDZ burden table: its output rows lack accuracy-class labels, so obtain a model-specific class/VA schedule before ordering.
- Use verified JDZF ratings: select class 0.2/30VA, class 0.5/80VA, or the stated dual-winding combinations; 200VA is thermal maximum.
- Confirm indoor conditions: verify 50Hz frequency, W-variant meaning, IP00 guarding, mounting, clearances, 1000m altitude, humidity and grounding.
Frequently Asked Questions
Q1: Which accuracy classes are available for these epoxy cast-resin voltage transformers?
They offer accuracy classes ranging from 0.2 to 3. Rated outputs reach up to 500VA depending on the selected class. Contact our engineering team to specify your exact metering requirements.
Q2: Can these 10kV transformers be installed in high-altitude environments?
No, standard models are restricted to altitudes not exceeding 1000m. They require indoor installation with ambient temperatures between -5°C and +40°C. Please contact us for high-altitude customization options.
Q3: Are custom voltage ratios available for the JDZ-6(W) series?
The standard JDZ-6(W) ratio is 6000/100V. Custom voltage ratios for 3kV, 6kV, and 10kV systems are subject to factory confirmation. Provide your specific primary and secondary voltage requirements for evaluation.
Q4: What routine tests are conducted on these voltage transformers before dispatch?
Standard routine tests are performed according to relevant international standards. Specific test reports and third-party certifications are subject to confirmation based on your order details. Request the test protocol during the quotation stage.
Q5: How long is the lead time for customized orders?
Lead times for standard 3kV, 6kV, and 10kV models vary by current stock levels. Customized epoxy cast-resin transformers require production scheduling subject to confirmation. Contact our sales department with your target delivery date for an accurate timeline.
Q6: What applications are these indoor cast-resin voltage transformers designed for?
They are designed for 50Hz medium-voltage indoor switchgear and cast-resin equipment. Suitable for voltage measurement and protection in 3kV, 6kV, and 10kV power distribution systems. Verify pollution degree compatibility with our technical team.