Product Overview
The JLSY-10 combined transformer is an outdoor oil-immersed three-phase three-component measurement device designed for 10kV 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 JLSY-10 supports an extended current range from 5A to 800A, accommodating both standard and high-current applications. The transformer offers dual voltage ratio options (10/0.1kV and 11/0.11kV) for flexibility in different metering configurations. Compliant with both GB20840.4-2015 and IEC 61869.4:2013 standards, this transformer is suitable for international projects requiring precise metering in 10kV systems.
Product Display
[Product images to be added]
Application Position
The JLSY-10 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 10kV 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
- 10kV outdoor distribution networks requiring three-phase three-component metering
- Compact substations with integrated CT PT measurement
- Industrial distribution systems with 10kV 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 800A
Application Case Studies
Application Scenario 1: High-Current Industrial Metering
Industrial facilities with 10kV incoming supply and high load currents require accurate energy measurement. The JLSY-10 supports current range from 5A to 800A, accommodating both standard loads (5-600A) and high-current applications (750-800A). The three-phase three-component configuration ensures precise measurement even under unbalanced load conditions.
Application Scenario 2: Dual Voltage Ratio Flexibility
Utilities deploy the JLSY-10 combined transformer in 10kV distribution networks with flexible voltage ratio options. The dual voltage ratio capability (10/0.1kV and 11/0.11kV) allows the same transformer to be used in different metering configurations, reducing inventory requirements and simplifying procurement.
Application Fit
Suitable For
- Outdoor 10kV metering points requiring three-phase three-component measurement
- Compact substations with integrated CT PT measurement
- Industrial facilities with 10kV incoming supply and high current loads
- Applications requiring current range from 5A to 800A
- 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 10kV
- 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 JLSY-10 is an outdoor oil-immersed combined transformer for 10kV 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 800A.
Voltage Transformer Data
| Rated Voltage (kV) |
Rated Insulation (kV) |
Accuracy Class |
Rated Output (VA) |
Max Output (VA) |
|---|---|---|---|---|
| 10/0.1 | 12/42/75 | 0.2 | 10 | 400 |
| 11/0.11 | 12/42/75 | 0.5 | 20 |
Current Transformer Data
| Rated Primary Current (A) |
Rated Insulation (kV) |
Accuracy Class |
Rated Output (VA) |
Short-Time Thermal Current |
Dynamic Current |
|---|---|---|---|---|---|
| 5 – 600 | 12/42/75 | 0.2S | 3×15 | 80 × I1n | 200 × I1n |
| 750 – 800 | 12/42/75 | 0.2S | 3×20 | 80 kA | 200 kA |
Installation & Dimensions
Dimension Reference
| View | Key Dimensions |
Application Note |
|---|---|---|
| Front View | Height ~615mm; Width 565mm | Three porcelain bushings with liquid level gauge |
| Side View | Standard profile dimensions | Secondary terminal box and oil drain hole |
| Top View | Length 620mm; Width 400mm | Six bushings in 2×3 arrangement |
Weight: Approximately 130kg
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 JLSY-10 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 JLSY-10 for 10kV systems with 12/42/75kV class insulation.
Select by current ratio: Determine CT primary current according to actual load current. Supports 5A to 800A primary current range, with 5-600A for standard applications and 750-800A for high-current applications.
Select by voltage ratio: Choose 10/0.1kV for standard metering or 11/0.11kV for alternative configurations.
Select by metering accuracy: Use 0.2S CT accuracy for high-accuracy energy metering. PT accuracy classes include 0.2 and 0.5.
Ordering Information
When ordering the JLSY-10 combined transformer, please specify:
- Model: JLSY-10
- System voltage: 10kV
- PT ratio: 10/0.1kV or 11/0.11kV
- CT primary current: 5A to 800A (specify exact value)
- CT secondary current: 5A
- CT accuracy class: 0.2S
- PT accuracy class: 0.2 or 0.5
- Installation type: Outdoor pole-mounted
- Quantity