Overview
The JDZ10-6R and JDZ10-10R are indoor single-phase epoxy cast-resin voltage transformers with built-in primary fuse protection, rated for 6kV/6.3kV and 10kV/11kV systems respectively. They feature a fully enclosed epoxy resin cast structure that encapsulates the core and windings, ensuring high insulation reliability, moisture resistance, and stable performance in typical indoor distribution environments.
These units deliver standardized secondary voltages (typically 100V or dual 100/100V) with accuracy classes of 0.2, 0.5, 1.0, or 3P, supporting energy metering, voltage indication, relay protection, and monitoring functions. They comply with GB1207-2006 and IEC60044-2:2003 standards and can be used individually as single-phase VTs or grouped into three-unit banks for three-phase applications.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| Model series | JDZ10-6R / JDZ10-10R / JDZ10-10(6)R |
| Voltage class | 6kV, 6.3kV, 10kV, 11kV |
| Insulation medium | Epoxy cast-resin |
| Primary protection | With fuse |
| Rated frequency | 50Hz / 60Hz |
| Secondary voltage | 0.1kV; dual-secondary 0.1/0.1kV |
| Accuracy classes | 0.2, 0.5, 1.0, 3P |
| Limit output | 400VA (6kV), 630VA (10kV/11kV) |
| Insulation level | 7.2/32/60kV (6kV); 12/42/75kV (10kV/11kV) |
| Phase configuration | Single-phase |
| Application environment | Indoor |
| Standards | GB1207-2006, IEC60044-2:2003 |
Model Designation
- J: Voltage transformer
- D: Single phase
- Z: Cast epoxy resin insulation
- 10: Design sequence
- 10(6): Rated voltage class (10kV/11kV or 6kV/6.3kV)
- R: With fuse
Construction
The JDZ10-6R and JDZ10-10R feature a robust epoxy cast-resin construction, where the magnetic core and primary/secondary windings are completely encapsulated within a solid, flame-retardant epoxy resin body. This monolithic structure provides excellent dielectric strength, mechanical stability, and resistance to humidity, dust, and surface tracking. The primary winding includes an integrated replaceable fuse housed within the resin block but accessible for maintenance. All external surfaces are smooth and non-hygroscopic, suitable for long-term operation in typical indoor switchgear environments without additional sealing or protective coatings.
Technical Parameters
Service Conditions
- Ambient temperature: -5°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, free from explosive or conductive dust, and without severe vibration or shock
Technical Parameters
The JDZ10-6R and JDZ10-10R are indoor epoxy cast-resin voltage transformers with integrated fuse protection, designed for 6 kV and 10 kV systems respectively. They feature class 0.2/0.5 accuracy, operate within -5°C to +40°C ambient temperature at altitudes up to 1000 m, and comply with international standards for insulation and performance.
Model Variants and Technical Data
| Type (Ratio) |
Rated Voltage (kV) |
Rated Insulation Level (kV) |
Accuracy Class and Rated Output (VA) |
Limit Output (VA) |
|---|---|---|---|---|
| JDZ10-6R | 6 / 0.1 6.3 / 0.1 |
7.2 / 32 / 60 | 0.2 – 20 0.5 – 30 |
400 |
| JDZ10-10R | 10 / 0.1 11 / 0.1 |
12 / 42 / 75 | 0.2 – 20 0.5 – 30 3P – 30 |
630 |
| JDZ10-6R | 6 / 0.1 / 0.1 6.3 / 0.1 / 0.1 |
7.2 / 32 / 60 | 0.2 / 0.5 – 20 / 30 0.5 / 0.5 – 30 / 30 |
400 |
| JDZ10-10R | 10 / 0.1 / 0.1 11 / 0.1 / 0.1 |
12 / 42 / 75 | 0.2 / 0.5 – 20 / 30 0.2 / 0.5 / 6P – 10 / 15 / 100 |
630 |
Installation & Wiring
Installation Diagram
The JDZ10-6R and JDZ10-10R indoor epoxy cast-resin potential transformers are mounted using two M8 bolts at the top and four M6 bolts at the terminal section. Ensure the mounting surface is level and secure to support the approximate 31kg unit weight. Maintain adequate clearance around the unit for ventilation and safe access during operation and maintenance.
Wiring Diagram
Primary terminals are labeled A and B. Secondary terminals may be marked as 1a, 2a, 2b or equivalent, depending on the internal winding configuration. The wiring diagram illustrates both single-phase connections and three-phase configurations using three units. Always verify terminal polarity and grounding before energizing the unit. For protective applications, confirm whether the circuit requires a dedicated metering winding, protection winding, or a combined output.
Selection & FAQs
Selection Guide
- Specify the exact primary: choose 6kV or 6.3kV for JDZ10-6R, and 10kV or 11kV for JDZ10-10R; do not substitute nominal voltages without a matching nameplate ratio.
- Select metering performance: published single-winding options are class 0.2 at 20VA or class 0.5 at 30VA, with one or two 100V secondary circuits.
- Validate protection options: JDZ10-10R lists class 3P at 30VA, but the multi-class 0.2/0.5/6P row has an inconsistent winding ratio and requires a corrected winding schedule.
- Coordinate the fuse and thermal limit: confirm primary-fuse ratings and use 400VA or 630VA only as thermal limits, not as metering or protection accuracy burdens.
- Approve documents and installation: request the current applicable VT standard and type tests, then verify terminal diagram, fuse access, mounting points, 31kg support, ambient and altitude.
Frequently Asked Questions
Q1: Can the JDZ10-10R voltage transformer be used in 11kV switchgear?
Yes, the JDZ10-10R supports 11/0.1 kV ratios with a 12 kV rated insulation level. It is suitable for 10kV and 11kV indoor systems. Specify your exact system voltage during ordering.
Q2: Which accuracy class is available for metering on this epoxy cast-resin VT?
Both 0.2 and 0.5 accuracy classes are available, providing 20 VA and 30 VA rated outputs respectively. Select the 0.2 class for precise measurement applications. Contact us to confirm specific burden requirements.
Q3: How do ambient temperature and altitude limits affect JDZ10 installation?
The maximum ambient temperature is +40°C and the maximum altitude is 1000 m. Ensure the indoor environment is free from explosive dust and severe vibration. Derating may apply for higher altitudes.
Q4: Are dual secondary windings available for the 6kV epoxy voltage transformer?
Yes, the JDZ10-6R is available with a 6/0.1/0.1 kV ratio featuring dual secondary windings. This allows simultaneous connections for metering and protection circuits. Confirm the specific dual-core configuration with our engineering team.
Q5: What factory tests are performed before shipping these indoor voltage transformers?
Standard routine tests are performed according to international insulation and performance standards. Specific type tests or custom test certificates are subject to confirmation. Please contact our sales team for detailed test reports.
Q6: Do you provide third-party certification for the JDZ10-10R voltage transformer?
Third-party certifications are available subject to specific project requirements and factory confirmation. We comply with international standards for insulation and performance. Contact us with your required certification body for a detailed quote.
Q7: Why choose the JDZ10 series for indoor 10kV switchgear applications?
These epoxy cast-resin voltage transformers provide reliable measurement and protection for 6kV and 10kV systems. They feature integrated fuse protection and high insulation levels. Ensure installation in non-corrosive, dust-free environments.