Product Overview
The JLSY-35 combined transformer metering box is an outdoor oil-immersed three-phase three-component high-voltage measurement device designed for 33kV and 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 JLSY-35 series 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. Available in both three-column (JLSY3-35) and six-column (JLSY6-35) configurations to meet different installation requirements. Compliant with GB20840.4-2015 and IEC 61869.4:2013 standards, this transformer is ideal for utility metering, industrial power measurement, and anti-theft applications.
Product Display
[Product images to be added]
Application Position
The JLSY-35 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. The star-connected PT configuration ensures balanced voltage measurement across all three phases.
Main Applications
- 33kV and 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 JLSY-35 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 integrated meter box with active and reactive energy meters enables comprehensive energy measurement, supporting anti-theft initiatives and energy conservation programs.
Application Scenario 2: Industrial High-Voltage Power Measurement
Industrial facilities with 33kV or 35kV incoming supply require accurate energy measurement for cost allocation and power quality monitoring. The JLSY-35 series supports current range from 5A to 800A with multiple accuracy classes (0.2S, 0.2, 0.5), accommodating various load conditions. The six-column configuration provides enhanced measurement precision for critical industrial applications.
Application Fit
Suitable For
- Outdoor 33kV and 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 800A
- 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 33kV (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 JLSY-35 is an outdoor oil-immersed combined transformer metering box for 33kV and 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 800A.
Model Variants
| Model | Configuration | Weight | Application |
|---|---|---|---|
| JLSY3-35 | Three-column type | 320 kg | Standard high-voltage metering |
| JLSY6-35 | Six-column type | 346 kg | Enhanced precision metering |
Voltage Transformer Data
| Rated Voltage (kV) |
Rated Insulation (kV) |
Accuracy Class |
Rated Output (VA) |
Max Output (VA) |
|---|---|---|---|---|
| 35/0.1 | 40.5/95/185 | 0.2 | 20 | 600 |
| 33/0.1 | 40.5/95/185 | 0.5 | 30 | |
| 33/0.11 | 40.5/95/185 | 0.5 | 30 |
Current Transformer Data
| Rated Current Ratio (A) |
Rated Insulation (kV) |
Accuracy Class |
Rated Output (VA) |
Short-Time Thermal Current |
Dynamic Current |
|---|---|---|---|---|---|
| 5 – 600 | 40.5/95/185 | 0.2S | 3×15 | 80 × I1n | 200 × I1n |
| 750 – 800 | 40.5/95/185 | 0.2S | 3×20 | 80 kA | 200 kA |
Installation & Dimensions
Dimension Reference
| Model | Key Dimensions |
Application Note |
|---|---|---|
| JLSY3-35 (Three-column) |
Height 1200+10mm; Width 970mm; Length 1325+10mm | Three insulators with 18° angle, center vertical |
| JLSY6-35 (Six-column) |
Height 910±5mm; Width 1040mm | Six insulators in two rows, enhanced terminal box |
Wiring Diagram
[Wiring diagram to be added]
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 JLSY-35 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 JLSY-35 for 33kV systems (33/0.1kV or 33/0.11kV ratio) or 35kV systems (35/0.1kV ratio) with 40.5/95/185kV insulation level.
Select by configuration: Choose three-column type (JLSY3-35, 320kg) for standard applications or six-column type (JLSY6-35, 346kg) for enhanced precision metering.
Select by current ratio: Determine CT primary current according to actual load current. Supports 5A to 800A primary current range with different output ratings for different current ranges.
Select by metering accuracy: Use 0.2S CT accuracy for high-accuracy energy metering. PT accuracy classes include 0.2 and 0.5.
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 JLSY-35 combined transformer metering box, please specify:
- Model: JLSY3-35 (three-column) or JLSY6-35 (six-column)
- System voltage: 33kV or 35kV
- PT ratio: 35/0.1kV, 33/0.1kV, or 33/0.11kV
- CT primary current: 5A to 800A (specify exact value)
- CT secondary current: 1A or 5A
- CT accuracy class: 0.2S
- PT accuracy class: 0.2 or 0.5
- Meter type: Active + reactive meters or combined electronic meter
- Installation type: Outdoor transformer high-side mounting
- Quantity