Product Overview
The JLSY12-11W combined transformer is an outdoor oil-immersed three-phase three-component measurement device designed for 11kV medium-voltage distribution systems. This CT PT combined transformer integrates voltage transformer (PT) and current transformer (CT) functions in a single oil-immersed assembly with porcelain bushings, providing accurate current and voltage signals for energy metering and protection applications in outdoor substations and distribution networks.
Featuring three-phase three-component design for enhanced measurement accuracy, the JLSY12-11W supports a wider current range from 5A to 600A compared to standard two-component designs. The oil-immersed insulation uses high-quality transformer oil for excellent heat dissipation and insulation performance in demanding outdoor environments. Compliant with both GB20840.4-2015 and IEC 61869.4:2013 standards, this transformer is suitable for international projects requiring precise metering in 11kV systems.
Product Display
Application Position
The JLSY12-11W is installed outdoors on poles, in substations, or at distribution points. The oil-immersed construction with porcelain bushings provides excellent insulation and heat dissipation. The three-phase three-component design ensures balanced measurement across all three phases. The primary terminals connect to the 11kV three-phase circuit, while the secondary terminal box supplies voltage and current signals to active energy meters, reactive energy meters, and monitoring instruments.
Main Applications
- 11kV outdoor distribution networks requiring three-phase three-component metering
- Compact substations with integrated CT PT measurement
- Industrial distribution systems with 11kV incoming supply
- High-accuracy revenue metering for utility billing
- Protection relay applications requiring precise current signals
- Projects requiring IEC 61869.4:2013 compliance
- Distribution networks with current range up to 600A
Application Case Studies
Application Scenario 1: International 11kV Distribution Metering
International utilities deploy the JLSY12-11W combined transformer in 11kV distribution networks for revenue billing and load monitoring. The three-phase three-component design provides balanced measurement accuracy across all phases, while the IEC 61869.4:2013 compliance ensures compatibility with international standards. The oil-immersed design provides excellent heat dissipation in outdoor environments with high ambient temperatures.
Application Scenario 2: High-Current Industrial Substation Metering
Industrial facilities with 11kV incoming supply and high load currents require accurate energy measurement. The JLSY12-11W supports current range from 5A to 600A, accommodating higher load conditions than standard two-component designs. The three-phase three-component configuration ensures precise measurement even under unbalanced load conditions.
Application Fit
Suitable For
- Outdoor 11kV metering points requiring three-phase three-component measurement
- Compact substations with integrated CT PT measurement
- Industrial facilities with 11kV incoming supply and high current loads
- Applications requiring current range from 5A to 600A
- Projects requiring IEC 61869.4:2013 compliance
- Distribution networks requiring high-accuracy metering
- Environments with high ambient temperatures requiring oil cooling
Not Recommended For
- Indoor-only compact switchgear applications
- Applications requiring separate CT and PT bodies
- Protection-only applications where metering accuracy is not required
- Systems with voltage levels other than 11kV
- Environments requiring maintenance-free operation (oil-immersed requires periodic oil checks)
Installation Conditions
- Installation position: Outdoor pole-mounted, substation, or distribution points
- Ambient temperature: -25°C to +55°C
- Maximum altitude: ≤ 4500m (no derating required)
- Insulation: Oil-immersed with porcelain bushings
- Rated frequency: 50Hz or 60Hz
- Grounding: Connect grounding terminal per local electrical codes and metering standards
- Maintenance: Periodic oil level check and oil quality inspection required
Technical Parameters
The JLSY12-11W is an outdoor oil-immersed combined transformer for 11kV 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, and current range from 5A to 600A.
Voltage Transformer Data
| Rated Voltage (kV) |
Rated Insulation (kV) |
Accuracy Class |
Rated Output (VA) |
Max Output (VA) |
|---|---|---|---|---|
| 10/0.1 | 12/30/75 | 0.2 | 3×10 | 3×300 |
Current Transformer Data
| Rated Primary Current (A) |
Rated Insulation (kV) |
Accuracy Class |
Rated Output (VA) |
Short-Time Thermal Current |
Dynamic Current |
|---|---|---|---|---|---|
| 5 – 600 | 12/30/75 | 0.2S | 3×10 | 80 × I1n | 200 × I1n |
Installation & Dimensions
Dimension Reference
| View | Key Dimensions |
Application Note |
|---|---|---|
| Front View | Width 345±5mm; Angles 38° | Three porcelain bushings with lifting hook |
| Side View | Height 730mm; Width 380mm | Profile with liquid level gauge |
| Top View | Length 710±5mm; Width 453±5mm | Bushing layout and terminal positions |
Weight: Total weight 148kg, Oil weight 34kg
Wiring Diagram
Installation Guidelines
- 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 JLSY12-11W combined transformer complies with GB20840.4-2015 and IEC 61869.4:2013 for combined instrument transformers, ensuring compatibility with both Chinese and international standards.
Selection Guide
Select by system voltage: Use JLSY12-11W for 11kV systems with 12/30/75kV class insulation.
Select by current ratio: Determine CT primary current according to actual load current. Supports 5A to 600A primary current range, accommodating higher loads than standard two-component designs.
Select by metering accuracy: Use 0.2S CT accuracy for high-accuracy energy metering. PT accuracy class is 0.2.
Select by component configuration: Three-phase three-component design provides balanced measurement across all phases for enhanced accuracy.
Ordering Information
When ordering the JLSY12-11W combined transformer, please specify:
- Model: JLSY12-11W
- System voltage: 11kV
- PT ratio: 10/0.1kV
- CT primary current: 5A to 600A (specify exact value)
- CT secondary current: 5A
- CT accuracy class: 0.2S
- PT accuracy class: 0.2
- Installation type: Outdoor pole-mounted
- Quantity