Product Overview
The JDZX9-35D/290 voltage transformer is an indoor single-phase epoxy resin cast measurement device designed for 35kV medium-voltage distribution systems. This advanced voltage transformer features epoxy resin cast insulation technology with arch-type structural design, providing excellent dielectric strength and maintenance-free operation for reliable performance in indoor environments.
The JDZX9-35D/290 delivers precise voltage measurement for energy metering, voltage monitoring, and relay protection applications with multiple accuracy classes (0.2, 0.5, 3P) and flexible winding configurations including residual voltage winding for ground fault detection. The epoxy resin cast construction ensures superior insulation performance while providing up to 800VA maximum output capacity. Compact arch-type design with 77kg weight simplifies installation and reduces structural support requirements.
Product Display
Application Position
The JDZX9-35D/290 is installed in indoor switchgear, substations, and distribution networks where reliable single-phase voltage measurement with residual voltage detection is required. The epoxy resin insulation provides excellent moisture resistance and UV protection for long-term indoor operation. Three units are typically connected in three-phase configuration with star-connected primary and secondary windings, plus open-delta connected residual voltage winding for ground fault detection.
Main Applications
- 35kV indoor distribution networks
- Substations requiring voltage measurement with ground fault detection
- Industrial facilities with medium-voltage supply
- Energy metering applications
- Voltage monitoring and relay protection
- Indoor power distribution systems
Application Case Studies
Application Scenario 1: Substation Voltage Measurement with Ground Fault Detection
Utilities deploy three JDZX9-35D/290 epoxy resin voltage transformers in 35kV indoor substations for energy metering and ground fault protection. The residual voltage winding connected in open-delta configuration provides zero-sequence voltage detection for ground fault identification, while the epoxy resin insulation ensures reliable performance in indoor environments with 40.5/95/200kV insulation level and maintenance-free operation.
Application Scenario 2: Industrial Medium-Voltage Metering
Industrial facilities with 35kV incoming supply require accurate voltage measurement for energy management and protection coordination. The JDZX9-35D/290 offers multiple accuracy classes (0.2, 0.5, 3P) to meet different measurement requirements, with up to 800VA maximum output capacity for various burden conditions and arch-type design providing enhanced structural stability.
Application Fit
Suitable For
- Indoor 35kV voltage measurement
- Substations with ground fault detection requirements
- Industrial facilities with medium-voltage supply
- Voltage monitoring applications
- Relay protection systems
- Environments requiring maintenance-free operation
Not Recommended For
- Outdoor installation applications (use outdoor-rated models)
- Current measurement applications (use CT instead)
- High-voltage systems above 40.5kV (use higher voltage class models)
- Applications requiring three-phase measurement in single unit
Installation Conditions
- Installation position: Indoor switchgear, substations, or distribution points
- Ambient temperature: -25°C to +40°C
- Altitude: ≤ 1000m (standard), higher altitude available on request
- Insulation: Epoxy resin cast
- Frequency: 50Hz or 60Hz
- Connection: Single-phase (three units for three-phase system)
- Maintenance: Minimal maintenance required (epoxy resin design)
Technical Parameters
The JDZX9-35D/290 is an indoor epoxy resin cast single-phase voltage transformer for 35kV systems. Operating temperature -25°C to +40°C, compliant with GB20840.3-2013 and IEC61869-3:2011 standards.
VT Data – Two Secondary Windings
| Rated Voltage (kV) |
Accuracy Class & Rated Output (VA) |
Max Output (VA) |
Insulation Level (kV) |
|---|---|---|---|
| 35/√3 : 0.1/√3 : 0.1/3 | 0.2/3P: 75/100 0.5/3P: 200/100 |
800 | 40.5/95/200 |
VT Data – Three Secondary Windings
| Rated Voltage (kV) |
Accuracy Class & Rated Output (VA) |
Max Output (VA) |
Insulation Level (kV) |
|---|---|---|---|
| 35/√3 : 0.1/√3 : 0.1/√3 : 0.1/3 | 0.2/0.5/3P: 50/60/100 | 800 | 40.5/95/200 |
VT Data – Four Secondary Windings
| Rated Voltage (kV) |
Accuracy Class & Rated Output (VA) |
Max Output (VA) |
Insulation Level (kV) |
|---|---|---|---|
| 35/√3 : 0.1/√3 : 0.1/√3 : 0.1/√3 : 0.1/3 | 0.2/0.5/3/3P: 50/50/100/100 | 600 | 40.5/95/200 |
Installation
Dimension Reference
| View | Key Dimensions |
Application Note |
|---|---|---|
| Front View | Height 510mm; Body height 386mm; Base width 415mm | Arch-type structure with high-voltage bushing on top |
| Side View | Base depth 290mm; Mounting holes 300mm x 320mm | Hollow center design for weight reduction and heat dissipation |
| Top View | Installation dimensions 300mm x 320mm | Four mounting holes for secure installation |
Weight: Approximately 77kg
Wiring Diagram
Installation Guidelines
- Install three units in indoor switchgear or substation for three-phase measurement
- Connect primary windings in star configuration with neutral grounded
- Connect secondary windings in star configuration for measurement and protection
- Connect residual voltage windings in open-delta configuration for ground fault detection
- Ensure proper grounding of all secondary circuits
- Verify voltage ratio matches system requirements before commissioning
- Check insulation resistance before energizing
Arch-Type Design Features
The JDZX9-35D/290 incorporates advanced arch-type structural design including:
- Hollow center construction for weight reduction
- Optimized electric field distribution
- Enhanced structural stability under short-circuit conditions
- Improved heat dissipation characteristics
Residual Voltage Winding
The JDZX9-35D/290 features dedicated residual voltage winding for ground fault detection:
- Open-delta connection provides zero-sequence voltage measurement
- Enables reliable ground fault identification in isolated or compensated networks
- Supports insulation monitoring and protection functions
- Enhances system safety and reliability
Epoxy Resin Features
The JDZX9-35D/290 incorporates advanced epoxy resin technology including:
- Excellent moisture resistance for indoor operation
- UV protection for long-term performance
- Superior insulation performance with 40.5/95/200kV level
- Maintenance-free construction eliminating periodic inspection
Standards
The JDZX9-35D/290 epoxy resin voltage transformer complies with GB20840.3-2013 and IEC61869-3:2011 for voltage transformers, ensuring compatibility with Chinese and international standards for medium-voltage measurement applications.
Selection Guide
Select by system voltage: JDZX9-35D/290 is designed for 35kV systems with 40.5/95/200kV insulation level.
Select by winding configuration: Choose two-winding for basic applications, three-winding for enhanced flexibility, or four-winding for maximum versatility.
Select by accuracy class: Use 0.2 for high-precision metering, 0.5 for standard metering, or 3P for protection applications.
Select by rated output: Choose rated output (50-200VA) based on connected burden requirements.
Ordering Information
When ordering the JDZX9-35D/290 epoxy resin voltage transformer, please specify:
- Model: JDZX9-35D/290
- System voltage: 35kV
- Winding configuration: Two, three, or four secondary windings
- Accuracy class: 0.2, 0.5, or 3P
- Rated output: Specify VA value from table
- Frequency: 50Hz or 60Hz
- Installation type: Indoor
- Quantity (typically 3 units for three-phase system)
FAQs