Overview
The JDZX11-35R is an indoor, single-phase epoxy resin cast voltage transformer rated for 35kV medium-voltage systems. It features cast-resin insulation with integrated fuse protection, ensuring high dielectric strength and reliable operation in indoor environments.
This transformer supports multiple accuracy classes (0.2, 0.5, 1.0, 6P/3P) and offers three-winding or four-winding configurations for energy metering, voltage monitoring, and relay protection. Compliant with relevant IEC standards, it includes a built-in fuse (Φ40×437mm, 0.5/1A) for secondary circuit protection and delivers up to 600VA thermal limit output capacity.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System Voltage | 35kV |
| Insulation Level | 40.5/95/200kV |
| Accuracy Classes | 0.2, 0.5, 1.0, 6P/3P |
| Thermal Limit Output | 600VA |
| Fuse Rating | Φ40×437mm, 0.5/1A |
| Phase Configuration | Single-phase |
| Winding Options | Three-winding or four-winding |
| Installation Type | Indoor |
| Insulation Material | Epoxy resin cast |
| Weight | 65.2kg |
Construction
The JDZX11-35R features a robust epoxy resin cast construction that provides excellent electrical insulation, moisture resistance, and mechanical stability. The core and windings are fully encapsulated in high-quality epoxy resin under vacuum conditions, eliminating air voids and ensuring uniform dielectric performance. This maintenance-free design enhances safety and reliability in indoor switchgear and substation applications. The integrated fuse is housed within the resin body, offering immediate short-circuit protection for secondary circuits without compromising the sealed structure.
Technical Parameters
Service Conditions
- Installation position: Indoor switchgear, substations, or distribution points
- Ambient temperature: -5°C to +50°C
- Altitude: ≤ 1000m (standard), higher altitude available on request
- Insulation: Epoxy resin cast
- Frequency: 50Hz or 60Hz
- Connection: Single-phase with built-in fuse
- Maintenance: Minimal maintenance required (epoxy resin design)
Technical Parameters
The JDZX11-35R is an indoor epoxy resin cast single-phase voltage transformer with built-in fuse for 35kV systems. It operates within an ambient temperature range of -5°C to +50°C and at altitudes up to 1000m (higher on request). The unit complies with GB20840.3-2013 and IEC61869-3:2011 standards.
| Type | Rated ratio(V) | Accuracy
classes |
Rated
Output(VA) |
Thermal limit
output(VA) |
|---|---|---|---|---|
| JDZX11-35R | 35/√3 : 0.1/√3 : 0.1/3 | 0.2/6P(3P) | 45/100 | 600 |
| 0.5/6P(3P) | 100/100 | |||
| 1.0/6P(3P) | 200/100 | |||
| 35/√3 : 0.1/√3 : 0.1/√3 : 0.1/3 | 0.2/0.2/6P(3P) | 20/20/100 | 600 corresponding to 0.2 class |
|
| 0.2/0.5/6P(3P) | 20/30/100 | |||
| 0.5/0.5/6P(3P) | 40/40/100 |
Installation & Wiring
Installation Diagram
The JDZX11-35R is designed for secure mounting within indoor switchgear or substations. Its base dimensions (223 x 167mm side view; 250 x 260mm front view) allow for standard bolted installation on panel bases. Ensure adequate clearance around the unit for ventilation and maintenance access, particularly around the cylindrical primary bushing and built-in fuse tube.
Wiring Diagram
Primary terminals are connected directly to the 35kV system bus. Secondary terminals provide output for metering and protection circuits, typically marked with standard polarity indicators (e.g., A, N or 1a, 1n). The secondary circuit must be grounded at a single point, usually at the terminal block or relay panel, in accordance with local codes. Verify that the voltage ratio (e.g., 35,000/√3 V : 100/√3 V) matches system requirements before energizing.
Selection & FAQs
Selection Guide
- Select for 35kV systems with 40.5/95/200kV insulation level.
- Choose three-winding for basic metering and protection or four-winding for added flexibility and redundancy.
- Pick accuracy class 0.2 for high-precision metering, 0.5 for standard metering, 1.0 for general measurement, or 6P(3P) for protection applications.
- Specify rated output between 45–200VA based on the total connected burden of your system.
- Confirm operating frequency (50Hz or 60Hz) and indoor installation requirements during selection.
- Select fuse rating (0.5A or 1A) to match secondary circuit protection needs.
Frequently Asked Questions
Q1: Which accuracy class is suitable for protective relaying?
Select the 6P or 3P class for protection applications. These classes ensure reliable operation during fault conditions up to the thermal limit of 600VA. Contact us for specific relay coordination details.
Q2: Can this 35kV voltage transformer operate at high altitudes?
Standard models are rated for altitudes up to 1000m. For installations above 1000m, custom derating or design modifications are available subject to factory confirmation.
Q3: What is the purpose of the built-in fuse?
The integrated fuse provides internal short-circuit protection for the single-phase transformer. It enhances safety within indoor switchgear and reduces external wiring requirements.
Q4: What international standards does this epoxy resin transformer comply with?
The JDZX11-35R fully complies with IEC61869-3:2011 and GB20840.3-2013 standards. Request the official type test report and certificate of conformity during the RFQ stage.
Q5: Are custom rated voltage ratios available for this model?
Standard ratios include 35/√3 : 0.1/√3 : 0.1/3 configurations. Non-standard ratio requirements can be manufactured subject to engineering evaluation and factory confirmation.
Q6: Where is the JDZX11-35R voltage transformer typically installed?
This 35kV indoor epoxy resin unit is designed for switchgear, substations, and distribution points. It operates in ambient temperatures from -5°C to +50°C.
Q7: How much maintenance does the epoxy cast design require?
The epoxy resin insulation requires minimal maintenance compared to oil-filled alternatives. It is ideal for indoor applications where regular servicing is restricted.