Overview
The JDZX6-11 and JDZC6-11 are outdoor epoxy cast-resin fully enclosed voltage transformers designed for 10kV/11kV medium-voltage power systems, with a 12kV international voltage class rating. These single-phase devices feature robust outdoor insulation construction using epoxy cast-resin technology, ensuring reliable operation in exposed environments without the need for oil or gas insulation.
Engineered for electric energy metering, voltage monitoring, and relay protection applications, they support standard secondary outputs of 100V (metering) and optional 220V (auxiliary power). Suitable for V/V or Y/Y/Δ wiring schemes, these transformers comply with GB20840.3-2013 and IEC61869-3:2011 standards, making them ideal for outdoor distribution networks operating at 50Hz or 60Hz.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System Voltage | 10kV / 11kV |
| Voltage Class | 12kV |
| Rated Frequency | 50Hz / 60Hz |
| Insulation Level | 12/40/75kV |
| Secondary Output | 100V (standard), 220V (optional) |
| Wiring Schemes | V/V, Y/Y/Δ |
| Ambient Temperature | -5°C to +40°C |
| Installation Type | Outdoor |
| Insulation Material | Epoxy cast-resin |
| Product Type | Single-phase outdoor VT/PT |
| Standards | GB20840.3-2013, IEC61869-3:2011 |
| Approximate Weight | 53.5kg |
Model Designation
- J: Voltage transformer
- D: Single-phase structure
- Z: Epoxy cast-resin insulation
- X: Residual voltage winding or special secondary function (model-dependent)
- C: Structural variant code for JDZC series
- 6: Design series number
- 11: Rated voltage code for 11kV system application
- 225: Dimension or structural suffix per manufacturer drawing
Construction
The JDZX6-11 and JDZC6-11 feature a monolithic outdoor epoxy cast-resin fully enclosed construction, providing excellent mechanical strength, weather resistance, and long-term dielectric stability. The core and windings are completely encapsulated in high-quality epoxy resin under vacuum conditions, eliminating internal voids and preventing moisture ingress. This solid-insulation design eliminates the need for oil or SF6, making the unit maintenance-free and environmentally safe. The housing includes integrated sheds for enhanced outdoor creepage performance, and terminals are arranged for secure connection in line-side outdoor installations. The secondary terminal box is sealed to IP54 or higher, protecting against dust and water splashes in exposed environments.
Technical Parameters
Service Conditions
- Ambient temperature: -40°C to +40°C
- Altitude: up to 1000 m above sea level
- Relative humidity: up to 95% at 25°C
- Installation environment: outdoor, pollution degree III
Technical Parameters
The JDZX6-11 and JDZC6-11 are 11kV system / 12kV class outdoor epoxy cast-resin voltage transformers designed for metering, auxiliary power, and protection applications. They feature a rated insulation level of 12kV, operate within an ambient temperature range of -40°C to +40°C, and are suitable for installation up to 1000 m altitude in outdoor environments with pollution degree III.
Metering and Auxiliary Power Output
| Rated Primary Voltage |
Metering Winding |
Accuracy Class |
Rated Output (VA) |
Power Winding |
Rated Output (VA) |
Max. Output (VA) |
|---|---|---|---|---|---|---|
| 10000V | 1a-1b, 100V | 0.5 | 50VA | 2a-2b, 220V | 1000VA | 3000VA |
Residual Voltage / Protection Configuration
| Rated Primary Voltage |
Metering Winding |
Accuracy Class |
Rated Output (VA) |
Power Winding |
Rated Output (VA) |
Residual / Protection Winding |
Rated Output (VA) |
Max. Output (VA) |
|---|---|---|---|---|---|---|---|---|
| 10000/√3V | 1a-1n, 100/√3V | 0.5 | 50VA | 2a-2n, 220/√3V | 1000VA | da-dn, 100/3V | 100VA | 3000VA |
Installation & Wiring
Installation Diagram
The JDZX6-11 and JDZC6-11 outdoor epoxy cast-resin voltage transformers are designed for pole or structure mounting. Secure the unit using the base mounting holes (base width: 210mm) with appropriate hardware. Ensure the installation surface is stable and capable of supporting the approximate weight of 53.5kg. Maintain adequate clearance around the unit for safety and ventilation.
Wiring Diagram
Primary terminals are clearly marked as A and B on the transformer. For V/V wiring applications, refer to Table 1 for metering and power secondary output connections. For Y/Y/Δ wiring applications, use Table 2 which includes metering, power, and residual/protection secondary outputs. Always verify terminal polarity before connecting meters or protective relays to ensure correct operation and measurement accuracy.
Selection & FAQs
Selection Guide
- Select the system scheme: use the 10kV/100V V/V arrangement for line-voltage metering and 220V auxiliary power, or the 10/√3kV Y/Y/△ arrangement when residual voltage is also required.
- Size the secondary loads: the published duties are class 0.5 at 50VA for metering, 1000VA for the 220V power winding and 100VA for the residual winding.
- Confirm protection accuracy: no 3P or 6P class is stated for the 100/3V winding, so relay suitability must be documented rather than inferred from its VA rating.
- Resolve rating differences: confirm whether the project is 10kV or 11kV and obtain the approved power-frequency/impulse withstand level because the source descriptions are not fully consistent.
- Approve outdoor suitability: verify JDZX6 versus JDZC6 construction, UV and pollution duty, terminal-box ingress protection, creepage, −40°C capability, mounting drawing, grounding and surge coordination.
Frequently Asked Questions
Q1: Can this voltage transformer be installed in high pollution outdoor environments?
Yes, it is designed for outdoor installation with pollution degree III. The epoxy cast-resin insulation ensures reliable performance in harsh conditions. Please confirm specific site pollution levels with our engineering team.
Q2: What is the accuracy class and output for the metering winding?
The metering winding provides 100V output with a 0.5 accuracy class and 50VA rated output. This meets standard metering requirements for 11kV systems. Contact us for custom accuracy class options.
Q3: Are these transformers suitable for high altitude installations above 1000 meters?
Standard models are rated for altitudes up to 1000 m above sea level. For installations exceeding this altitude, derating or special design modifications are required. Please consult our technical department for high-altitude specifications.
Q4: Which auxiliary power output configurations are available for this 12kV class transformer?
The standard configuration includes a 220V power winding rated at 1000VA, with a maximum output of 3000VA. Custom secondary voltage and VA ratings are available. Specify your exact requirements when requesting a quote.
Q5: How can we request custom primary voltage ratios for this model?
The standard primary voltage is 10000V for 11kV systems. Custom primary ratios and specific terminal arrangements can be manufactured. Please provide your single-line diagram to our engineering team for evaluation.
Q6: What applications are the JDZX6-11 and JDZC6-11 outdoor voltage transformers used for?
These 12kV class epoxy cast-resin transformers are applied in metering, auxiliary power, and protection for outdoor substations. They facilitate voltage transformation across 11kV distribution networks.
Q7: Why choose epoxy cast-resin insulation for outdoor 11kV voltage transformers?
Epoxy cast-resin provides high moisture resistance and mechanical strength for outdoor pollution degree III environments. It eliminates the need for oil maintenance in outdoor installations.