Product Overview
The JLS-33/35 combined transformer metering box is an outdoor oil-immersed three-phase two-component high-voltage measurement device designed for 33kV and 35kV power grids. This integrated metering solution combines current transformer (CT) and voltage transformer (PT) functions in a single oil-immersed assembly with porcelain bushings, providing accurate active and reactive energy measurement for high-voltage distribution networks.
Featuring three-phase two-component design with dual voltage ratio options (33000/110V and 35000/100V), the JLS series delivers reliable measurement performance for medium to high current applications. Available in two weight specifications: 365kg for currents up to 300A and 428kg for currents from 400A to 1200A. The oil-immersed insulation uses high-quality transformer oil for excellent heat dissipation and insulation performance in demanding outdoor environments. Compliant with GB/T201-2006 standards.
Product Display
Application Position
The JLS-33/35 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 three-phase two-component configuration ensures balanced measurement across phases A and C, with phase B serving as the common reference point.
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
- Medium to high current measurement applications (up to 1200A)
- Energy conservation and power supply management
- Projects requiring GB/T201-2006 compliance
Application Case Studies
Application Scenario 1: Utility High-Voltage Metering
Power utilities deploy the JLS-33/35 combined transformer metering box on the high-voltage side of distribution transformers for revenue billing and load monitoring. The three-phase two-component design provides balanced measurement accuracy across phases A and C. The dual weight specifications (365kg and 428kg) allow utilities to select the appropriate model based on load current requirements.
Application Scenario 2: Industrial High-Current Power Measurement
Industrial facilities with 33kV or 35kV incoming supply and high load currents require accurate energy measurement. The JLS-33/35 supports current range from 5A to 1200A across two specifications, accommodating various load conditions. The 428kg specification handles currents from 400A to 1200A, making it suitable for heavy 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 1200A
- Projects requiring GB/T201-2006 compliance
- Environments with ambient temperature -15°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 JLS-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: -15°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 JLS-33/35 is an outdoor oil-immersed combined transformer metering box for 33kV and 35kV systems with three-phase two-component design. Operating temperature -15°C to +55°C, altitude up to 4500m, compliant with GB/T201-2006. Features oil-immersed insulation, porcelain bushings, and current range from 5A to 1200A.
Model Variants
| Specification | Current Range |
Weight | Dimensions (Width) |
Application |
|---|---|---|---|---|
| Standard | 5 – 300A | 365 kg | 1300 ± 10mm | Medium current applications |
| Heavy-duty | 400 – 1200A | 428 kg | 1530 ± 10mm | High current industrial applications |
Voltage Transformer Data
| Rated Voltage (V) |
Accuracy Class |
Rated Output (VA) |
Rated Insulation Level (kV) |
|---|---|---|---|
| 33000/110 | 0.2 | 40 | 40.5/95/185 |
| 35000/100 | 0.5 | 60 |
Current Transformer Data
| Rated Current Ratio (A) |
Accuracy Class |
Rated Output (VA) |
Short-Time Thermal Current |
Dynamic Current |
Rated Insulation Level (kV) |
|---|---|---|---|---|---|
| 5 – 300/5 | 0.2S | 15 | 80 × I1n | 200 × I1n | 40.5/95/185 |
| 5 – 300/5 | 0.2 | 15 | 80 × I1n | 200 × I1n | |
| 5 – 300/5 | 0.5 | 20 | 80 × I1n | 200 × I1n |
Installation & Dimensions
Dimension Reference
| Specification | Key Dimensions |
Application Note |
|---|---|---|
| Standard (365kg) | Width 1300±10mm; Height 1215±5mm; Tank 430mm | Three insulators with center vertical, outer angled |
| Heavy-duty (428kg) | Width 1530±10mm; Height 1140±10mm | Enhanced construction for high current applications |
Wiring Diagram
Installation Guidelines
- Install on high-voltage side of power supply transformer
- Confirm AP1/AP2/AP3 and CP1/CP2/CP3 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 JLS-33/35 combined transformer metering box complies with GB/T201-2006 for combined instrument transformers, ensuring compatibility with Chinese standards for high-voltage metering applications.
Selection Guide
Select by system voltage: Use JLS-33 for 33kV systems (33000/110V ratio) or JLS-35 for 35kV systems (35000/100V ratio) with 40.5/95/185kV insulation level.
Select by current range: Choose 365kg specification for currents up to 300A or 428kg specification for currents from 400A to 1200A based on actual load requirements.
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 wiring configuration: Choose single ratio or double ratio wiring diagram based on measurement requirements.
Ordering Information
When ordering the JLS-33/35 combined transformer metering box, please specify:
- Model: JLS-33 or JLS-35
- System voltage: 33kV or 35kV
- PT ratio: 33000/110V or 35000/100V
- CT primary current: 5A to 1200A (specify exact value)
- CT secondary current: 5A
- CT accuracy class: 0.2S, 0.2, or 0.5
- PT accuracy class: 0.2 or 0.5
- Weight specification: 365kg (≤300A) or 428kg (400-1200A)
- Wiring configuration: Single ratio or double ratio
- Installation type: Outdoor transformer high-side mounting
- Quantity