Overview
The JDZX2-12W, JDZX2-35W are outdoor single-phase epoxy resin cast voltage transformers designed for 10kV and below medium-voltage distribution systems. It features fully enclosed construction with advanced epoxy resin insulation, offering high dielectric strength and long-term reliability in harsh outdoor conditions.
This transformer provides accurate voltage measurement for energy metering, voltage monitoring, and relay protection in neutral non-effectively grounded systems. It complies with relevant IEC and GB standards for outdoor voltage transformers, ensuring stable performance under pollution class IV environments with excellent resistance to UV, moisture, and electrical arcing.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System Voltage | 12kV / 35kV |
| Primary Voltage | 12kV or 35kV (model dependent) |
| Secondary Voltage | 100V / √3 or 100V |
| Accuracy Class | 0.2 / 0.5 / 3P (as per application) |
| Rated Output | 10–100VA (depending on accuracy class) |
| Insulation Level | LI75AC30 (for 12kV), LI200AC95 (for 35kV) |
| Partial Discharge | <10 pC at 1.2Um/√3 |
| Climatic Category | -40°C to +40°C |
| Pollution Degree | Class IV |
| Installation Position | Any orientation |
| Connection Type | Y or V connection |
| Application System | Neutral non-effectively grounded |
Construction
The JDZ(X)2-12(35)W features a monolithic cast-resin structure encapsulating the primary and secondary windings in high-grade epoxy resin. This solid insulation system eliminates internal air gaps, providing uniform electric field distribution and high resistance to partial discharge. The housing is UV-stabilized and hydrophobic, ensuring long-term outdoor durability with anti-tracking and anti-pollution properties. The design incorporates an extended creepage distance compliant with pollution class IV requirements. All metal parts are corrosion-resistant, and the compact, lightweight body allows flexible mounting in any spatial orientation without performance degradation.
Technical Parameters
Service Conditions
- Installation position: Outdoor switchgear, substations, or distribution points
- Ambient temperature: -25°C to +40°C
- Anti-pollution class: IV class
- Insulation: Epoxy resin cast
- Frequency: 50Hz or 60Hz
- Connection: Y connection or V connection
- Maintenance: Minimal maintenance required (epoxy resin design)
Technical Parameters
The JDZ(X)2-12(35)W is an outdoor single-phase epoxy resin cast voltage transformer designed for systems up to 35 kV. It operates within a temperature range of -25°C to +40°C, features anti-pollution class IV insulation, and complies with IEC 186 and GB1207-1997 standards.
| Type | Rated voltage
Tation(V) |
Rated output(vA) | Limit
output(vA) |
Rated insulated
level(kV) |
||
|---|---|---|---|---|---|---|
| 0.2 | 0.5 | 6P | ||||
| JDZ71-12W | 10000/100 | 40 | 80 | 500 | 12/42/75 | |
| JDZX71-12W | 10000/√3 : 100/√3 : 100/3 | 30 | 60 | 50 | 400 | |
| JDZ71-35 | 35000/100 | 60 | 150 | 1500 | 40.5/95/185 | |
| JDZX71-35 | 35000/√3 : 100/√3 : 100/3 | 50 | 120 | 100 | 800 | |
Installation & Wiring
Installation Diagram
The JDZ(X)2-12(35)W voltage transformer features a compact design that allows installation in any direction. It is mounted using a square metal base plate with four mounting holes for secure bolting to a foundation.
Wiring Diagram
Primary and secondary connections are made via two vertical bushings. For Y connection, the neutral point must be connected to system ground. For V connection, wiring is made between two phases. Secondary terminals should be connected to meters and protection devices as required. Always verify that the voltage ratio matches system requirements before commissioning.
Selection & FAQs
Selection Guide
- Select JDZ2-12W for 12kV systems or JDZ2-35W for 35kV systems based on your system voltage.
- Choose accuracy class 0.2 for high-precision metering applications or 0.5 for standard metering needs.
- Specify Y connection for phase-to-neutral (star) measurement or V connection for phase-to-phase measurement.
- Opt for the JDZX2 model if a residual voltage winding is required for ground fault detection in non-effectively grounded systems.
- Confirm frequency (50Hz or 60Hz), outdoor installation type, and required quantity when placing your order.
Frequently Asked Questions
Q1: Can this epoxy resin VT be installed in heavily polluted outdoor areas?
Yes, it features anti-pollution class IV insulation suitable for harsh outdoor environments. The cast-resin design ensures reliable operation from -25°C to +40°C. Contact us for specific site condition assessments.
Q2: Which accuracy class is available for metering and protection applications?
The transformer offers 0.2, 0.5, and 6P accuracy classes. Class 0.2 provides 30VA to 40VA output for metering, while 6P delivers up to 50VA for protection. Specify your exact burden requirements during ordering.
Q3: How is the 12kV voltage transformer connected in three-phase systems?
It supports both Y and V connection configurations. The JDZX71-12W model uses a 10000/√3 primary ratio for grounded systems. Confirm your system grounding method with our engineering team.
Q4: What international standards does this 35kV outdoor voltage transformer comply with?
The unit complies with IEC 186 and GB1207-1997 standards. It is designed for systems up to 35kV with a rated insulation level of 12/42/75kV for the 12kV variant. Request the full type test report for your project.
Q5: Can the operating frequency be customized for 60Hz power grids?
Yes, the transformer is designed for both 50Hz and 60Hz frequency systems. Ensure you specify the exact grid frequency and rated output burden when requesting a quotation.
Q6: What is the primary application of the JDZX2 cast-resin voltage transformer?
It is primarily used in outdoor switchgear, substations, and distribution points up to 35kV. The epoxy resin insulation provides minimal maintenance and high dielectric strength. Check our catalog for similar medium-voltage instrument transformers.
Q7: Why choose epoxy resin casting over traditional oil-filled voltage transformers?
Epoxy resin casting eliminates oil leakage risks and requires minimal maintenance. It provides excellent moisture resistance and mechanical strength for outdoor switchgear installations. Contact our sales team for lifecycle cost comparisons.