Product Overview
The JDZX12-35R voltage transformer is an indoor epoxy cast-resin single-phase measurement device designed for 35kV medium-voltage distribution systems. This advanced voltage transformer features epoxy resin cast insulation technology, providing excellent dielectric strength and maintenance-free operation for reliable performance in indoor environments.
The JDZX12-35R delivers precise voltage measurement for energy metering, voltage monitoring, and relay protection applications with multiple accuracy classes (0.2, 0.5, 1.0, 6P) and flexible winding configurations. Available in two connection types: Y/△ connection (three-winding configuration) and Y/Y/△ connection (four-winding configuration). The epoxy resin cast construction ensures superior insulation performance while providing up to 600VA thermal limit output capacity. Compact design with 68kg weight simplifies installation and reduces structural support requirements.
Product Display
Application Position
The JDZX12-35R is installed in indoor switchgear, substations, and distribution networks where reliable single-phase voltage measurement is required. The epoxy resin insulation provides excellent moisture resistance and long-term durability for 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 JDZX12-35R epoxy cast-resin voltage transformers in 35kV indoor substations for energy metering and ground fault protection. The three-winding configuration with Y/△ connection provides accurate voltage signals for protection relays and metering devices, while the open-delta connected residual voltage winding enables reliable ground fault detection. 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 with Enhanced Flexibility
Industrial facilities with 35kV incoming supply require accurate voltage measurement for energy management and protection coordination. The JDZX12-35R offers four-winding configuration (Y/Y/△) with dual secondary outputs, providing enhanced system flexibility and redundancy for critical applications. Multiple accuracy classes (0.2, 0.5, 1.0, 6P) meet different measurement requirements, with 600VA thermal limit output capacity for various burden conditions.
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: -5°C to +50°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 JDZX12-35R series includes indoor epoxy cast-resin single-phase voltage transformers for 35kV systems. Operating temperature -5°C to +50°C, compliant with GB20840.3-2013 and IEC60044-2:2003 standards.
Three-Winding VT Data
JDZX12-35R model with Y/△ connection configuration for basic metering and protection applications.
| Rated Voltage (kV) |
Accuracy Class & Rated Output (VA) |
Thermal Limit Output (VA) |
Insulation Level (kV) |
|---|---|---|---|
| 33/√3 : 0.1/√3 35/√3 : 0.1/√3 : 0.1/√3 |
0.2/6P(3P): 45/100 0.5/6P(3P): 100/100 1.0/6P(3P): 200/100 |
600 | 40.5/95/200 |
Four-Winding VT Data
JDZXW12-35R model with Y/Y/△ connection configuration for dual secondary outputs and enhanced redundancy.
| Rated Voltage (kV) |
Accuracy Class & Rated Output (VA) |
Thermal Limit Output (VA) |
Insulation Level (kV) |
|---|---|---|---|
| 35/√3 : 0.1/√3 : 0.1/√3 : 0.1/3 | 0.2/0.2/6P(3P): 20/20/100 0.2/0.5/6P(3P): 20/30/100 0.5/0.5/6P(3P): 40/40/100 |
600 (0.2 Class) | 40.5/95/200 |
Installation
Dimension Reference
Overall dimensions: 815±10mm (height) × 403mm (width) × 280mm (depth). Weight: approximately 68kg. Mounting holes: 4×M6 on base plate.
Wiring Diagram
Figure 1: Y/△ Connection (Three-Winding) – Primary terminals A, B, C connect to star configuration, secondary outputs a, b, c for metering, da/dn for open-delta ground fault detection.
Figure 2: Y/Y/△ Connection (Four-Winding) – Enhanced configuration with dual secondary winding sets (1a/1b/1c and 2a/2b/2c) plus delta output (da/dn) for maximum flexibility.
Installation Guidelines
- Mounting: Secure the transformer to a flat, stable surface using the four mounting holes on the base flange. Ensure the mounting surface can support the 68kg weight.
- Clearance: Maintain adequate clearance around the transformer for ventilation and maintenance access. Follow local electrical codes for minimum clearance requirements.
- Primary Connection: Connect the primary terminals (A, N) to the 35kV power system using appropriate high-voltage cables and connectors. Ensure proper torque specifications are followed.
- Secondary Connection: Connect secondary terminals to metering devices, protection relays, or monitoring equipment according to the wiring diagram. Use shielded cables for secondary circuits to minimize electromagnetic interference.
- Grounding: Ensure proper grounding of the transformer base and secondary circuit neutral point for safety and accurate measurement.
Epoxy Resin Features
- Superior Insulation: Epoxy resin provides excellent dielectric strength with rated insulation level up to 40.5/95/200kV
- Moisture Resistance: Cast-resin construction prevents moisture ingress, ensuring stable performance in humid environments
- Mechanical Strength: Epoxy resin housing offers high impact resistance and structural integrity
- Maintenance-Free: Sealed epoxy design eliminates the need for regular insulation testing or oil maintenance
- Long Service Life: Epoxy resin insulation resists aging and maintains performance over decades of operation
Standards
- GB20840.3-2013 (Instrument transformers – Part 3: Inductive voltage transformers)
- IEC60044-2:2003 (Instrument transformers – Part 2: Inductive voltage transformers)
- Customer-specific requirements available on request
Selection Guide
When selecting the JDZX12-35R voltage transformer, consider the following factors:
- Accuracy Class: Choose 0.2 for revenue metering, 0.5 for monitoring applications, 1.0 for general measurement, 6P/3P for protection applications
- Winding Configuration: Select three-winding (Y/△) for basic metering and protection, or four-winding (Y/Y/△) for dual secondary outputs and enhanced redundancy
- Burden Requirements: Ensure the rated output matches the connected load (metering devices, relays) to maintain accuracy
- Environmental Conditions: Verify ambient temperature (-5°C to +50°C) and altitude (≤1000m standard) match your installation environment
Ordering Information
When ordering the JDZX12-35R voltage transformer, please specify:
- Model: JDZX12-35R (three-winding) or JDZXW12-35R (four-winding)
- Rated voltage ratio (e.g., 35/√3 / 0.1/√3 kV)
- Accuracy class and rated output (e.g., 0.2/6P, 45/100VA)
- Rated frequency (50Hz or 60Hz)
- Quantity required
- Any special requirements or custom specifications