Product Overview
The JLSY12-35W combined transformer metering box is an outdoor oil-immersed three-phase three-component high-voltage measurement device designed for 35kV power grids. This integrated metering solution combines current transformer (CT), voltage transformer (PT), and meter box in a single oil-immersed assembly, providing accurate active and reactive energy measurement for high-voltage distribution networks.
Featuring three-phase three-component design with star-connected voltage transformers, the JLSY12-35W delivers enhanced measurement accuracy and balanced phase performance. The oil-immersed insulation uses high-quality transformer oil for excellent heat dissipation and insulation performance in demanding outdoor environments. With a total weight of 352kg and enhanced insulation level of 40.5/80/200kV, this transformer is ideal for utility metering, industrial power measurement, and anti-theft applications. Compliant with GB20840.4-2015 and IEC 61869.4:2013 standards.
Product Display
Application Position
The JLSY12-35W is installed on the high-voltage side of power supply transformers in outdoor substations and distribution networks. The oil-immersed construction with porcelain bushings provides excellent insulation and heat dissipation for high-voltage applications. The integrated meter box contains three-phase active energy meters, reactive energy meters, or combined electronic meters for direct measurement of active and reactive energy in high-voltage lines.
Main Applications
- 35kV high-voltage distribution networks
- Utility revenue metering and billing applications
- Industrial facilities with high-voltage incoming supply
- Power supply transformer high-side metering
- Anti-theft energy measurement systems
- Energy conservation and power supply management
- Projects requiring GB20840.4-2015 and IEC 61869.4:2013 compliance
Application Case Studies
Application Scenario 1: Utility High-Voltage Metering
Power utilities deploy the JLSY12-35W combined transformer metering box on the high-voltage side of distribution transformers for revenue billing and load monitoring. The three-phase three-component design with star-connected PTs provides balanced measurement accuracy across all phases. The enhanced insulation level (40.5/80/200kV) ensures reliable operation in demanding 35kV environments.
Application Scenario 2: Industrial High-Voltage Power Measurement
Industrial facilities with 35kV incoming supply require accurate energy measurement for cost allocation and power quality monitoring. The JLSY12-35W supports current range from 5A to 600A with 0.2S accuracy class, accommodating various load conditions. The robust 352kg construction ensures stability and long-term reliability in industrial environments.
Application Fit
Suitable For
- Outdoor 35kV high-voltage metering points
- Utility revenue metering and billing applications
- Industrial facilities with high-voltage incoming supply
- Power supply transformer high-side metering
- Applications requiring current range from 5A to 600A
- Projects requiring GB20840.4-2015 and IEC 61869.4:2013 compliance
- Anti-theft energy measurement systems
- Environments with ambient temperature -25°C to +55°C
Not Recommended For
- Indoor-only compact switchgear applications
- Applications requiring separate CT and PT bodies
- Protection-only applications where metering accuracy is not required
- Medium-voltage systems below 35kV (use JLSY-10 model instead)
- Environments requiring maintenance-free operation (oil-immersed requires periodic oil checks)
Installation Conditions
- Installation position: Outdoor substation or distribution points on transformer high-voltage side
- Ambient temperature: -25°C to +55°C
- Maximum altitude: ≤ 4500m (no derating required)
- Insulation: Oil-immersed with porcelain bushings
- Oil type: High-quality transformer oil
- Grounding: Connect grounding terminal per local electrical codes and metering standards
- Maintenance: Periodic oil level check and oil quality inspection required
Technical Parameters
The JLSY12-35W is an outdoor oil-immersed combined transformer metering box for 35kV systems with three-phase three-component design. Operating temperature -25°C to +55°C, altitude up to 4500m, compliant with GB20840.4-2015 and IEC 61869.4:2013. Features oil-immersed insulation, porcelain bushings, star-connected PT configuration, and current range from 5A to 600A.
Voltage Transformer Data
| Rated Voltage (kV) |
Rated Insulation (kV) |
Accuracy Class |
Rated Output (VA) |
Max Output (VA) |
|---|---|---|---|---|
| 35/0.1 | 40.5/80/200 | 0.2 | 3×10 | 3×500 |
Current Transformer Data
| Rated Current Ratio (A) |
Rated Insulation (kV) |
Accuracy Class |
Rated Output (VA) |
Short-Time Thermal Current |
Dynamic Current |
|---|---|---|---|---|---|
| 5 – 600 | 40.5/80/185 | 0.2S | 3×10 | 80 × I1n | 200 × I1n |
Installation & Dimensions
Dimension Reference
| View | Key Dimensions |
Application Note |
|---|---|---|
| Front View | Width 465+5mm; Height 965+5mm | Three insulators with 24.3° angle, center vertical |
| Side View | Width 650+5mm; Height 965+5mm | Two vertical insulators with air release valve |
| Top View | Length 965+5mm; Width 790mm | Six insulator positions in rectangular layout |
Weight: Total weight 352kg, Oil weight 110kg
Wiring Diagram
Installation Guidelines
- Install on high-voltage side of power supply transformer
- Confirm AP1/AP2, BP1/BP2, and CP1/CP2 terminal sequence before commissioning
- CT secondary circuits must not be open-circuited during operation
- PT secondary terminals provide voltage input to meters and monitoring devices
- CT secondary terminals provide current input to active and reactive energy meters
- Grounding and meter box wiring should follow the approved project wiring diagram
- Check oil level through inspection window before commissioning
- Ensure oil drain port is properly sealed during operation
Standards Compliance
The JLSY12-35W combined transformer metering box complies with GB20840.4-2015 and IEC 61869.4:2013 for combined instrument transformers, ensuring compatibility with both Chinese and international standards for high-voltage metering applications.
Selection Guide
Select by system voltage: Use JLSY12-35W for 35kV systems with 35/0.1kV voltage ratio and 40.5/80/200kV insulation level.
Select by current ratio: Determine CT primary current according to actual load current. Supports 5A to 600A primary current range with 0.2S accuracy class.
Select by metering accuracy: Use 0.2S CT accuracy for high-accuracy energy metering. PT accuracy class is 0.2.
Select by meter type: Choose active energy meter + reactive energy meter combination, or combined electronic meter based on measurement requirements.
Ordering Information
When ordering the JLSY12-35W combined transformer metering box, please specify:
- Model: JLSY12-35W
- System voltage: 35kV
- PT ratio: 35/0.1kV
- CT primary current: 5A to 600A (specify exact value)
- CT secondary current: 1A or 5A
- CT accuracy class: 0.2S
- PT accuracy class: 0.2
- Meter type: Active + reactive meters or combined electronic meter
- Installation type: Outdoor transformer high-side mounting
- Quantity
FAQs