Product Overview
The JLSY-6/10 combined transformer is an outdoor oil-immersed three-phase three-component measurement device designed for 6kV and 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 with star-connected voltage transformers, the JLSY series delivers enhanced measurement accuracy and balanced phase performance. The oil-immersed insulation uses high-quality 45# transformer oil for excellent heat dissipation and insulation performance in demanding outdoor environments. Compliant with GB20840.4-2015 standards, this transformer is suitable for rural distribution networks, industrial facilities, and utility metering applications requiring precise measurement in medium-voltage systems.
Product Display
Application Position
The JLSY-6/10 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 star-connected PT configuration ensures balanced voltage measurement across all three phases. The primary terminals connect to the three-phase medium-voltage circuit, while the secondary terminal box supplies voltage and current signals to active energy meters, reactive energy meters, and monitoring instruments.
Main Applications
- 6kV and 10kV outdoor distribution networks
- Rural power distribution and irrigation station metering
- Industrial facilities with medium-voltage incoming supply
- Compact substations with integrated CT PT measurement
- High-accuracy revenue metering for utility billing
- Protection relay applications requiring precise current signals
- Projects requiring GB20840.4-2015 compliance
Application Case Studies
Application Scenario 1: Rural Distribution Network Metering
Rural utilities deploy the JLSY-6/10 combined transformer in 6kV and 10kV distribution networks for revenue billing and load monitoring. The three-phase three-component design with star-connected PTs provides balanced measurement accuracy across all phases. The oil-immersed design provides excellent heat dissipation in outdoor environments with varying ambient temperatures.
Application Scenario 2: Industrial Substation Metering
Industrial facilities with 6kV or 10kV incoming supply require accurate energy measurement for cost allocation and load monitoring. The JLSY series supports current range from 5A to 300A with multiple accuracy classes (0.2S, 0.2, 0.5), accommodating various load conditions and metering precision requirements.
Application Fit
Suitable For
- Outdoor 6kV and 10kV metering points
- Rural distribution networks and irrigation stations
- Industrial facilities with medium-voltage incoming supply
- Compact substations with integrated CT PT measurement
- Applications requiring current range from 5A to 300A
- Projects requiring GB20840.4-2015 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
- High-voltage systems above 10kV (use JLS-35W model instead)
- Environments requiring maintenance-free operation (oil-immersed requires periodic oil checks)
Installation Conditions
- Installation position: Outdoor pole-mounted, substation, or distribution points
- Ambient temperature: -15°C to +55°C
- Maximum altitude: ≤ 4500m (no derating required)
- Insulation: Oil-immersed with porcelain bushings
- Oil type: 45# 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-6/10 is an outdoor oil-immersed combined transformer for 6kV and 10kV systems with three-phase three-component design. Operating temperature -15°C to +55°C, altitude up to 4500m, compliant with GB20840.4-2015. Features oil-immersed insulation, porcelain bushings, star-connected PT configuration, and current range from 5A to 300A.
Voltage Transformer Data
| Rated Voltage Ratio (V) |
Accuracy Class |
Rated Output |
Rated Insulation Level (kV) |
|---|---|---|---|
| 6000/√3 / 100/√3 / 100/3 | 0.2 | 30 VA | 7.2/32/60 |
| 10000/√3 / 100/√3 / 100/3 | 0.5 | 40 VA | 12/42/75 |
| 11000/√3 / 110/√3 / 110/3 | 0.5 | 60 VA | 12/42/75 |
Current Transformer Data
| Rated Current Ratio (A) |
Accuracy Class |
Rated Output |
Short-Time Thermal Current |
Dynamic Current |
Rated Insulation Level (kV) |
|---|---|---|---|---|---|
| 5 – 300/5 | 0.2S | 15 VA | 60 × I1n | 150 × I1n | 12/42/75 |
| 5 – 300/5 | 0.2 | 15 VA | 60 × I1n | 150 × I1n | 12/42/75 |
| 5 – 300/5 | 0.5 | 20 VA | 60 × I1n | 150 × I1n | 12/42/75 |
Installation & Dimensions
Dimension Reference
| View | Key Dimensions |
Application Note |
|---|---|---|
| Front View | Height 670mm; Width 410mm | Three porcelain bushings with 180mm spacing |
| Side View | Base width 320/374mm | Profile with nameplate and mounting holes |
| Top View | Width 330/315mm | Three bushing bases and terminal box |
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-6/10 combined transformer complies with GB20840.4-2015 for combined instrument transformers. For international projects, compliance should be aligned with applicable IEC instrument transformer standards and local utility metering rules.
Selection Guide
Select by system voltage: Use JLSY-6 for 6kV systems (7.2/32/60kV insulation) or JLSY-10 for 10kV systems (12/42/75kV insulation).
Select by voltage ratio: Choose 6000/√3 / 100/√3 / 100/3 for JLSY-6, or 10000/√3 / 100/√3 / 100/3 for JLSY-10 according to network voltage and meter input requirement.
Select by current ratio: Determine CT primary current according to actual load current. Supports 5A to 300A primary current range.
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-6/10 combined transformer, please specify:
- Model: JLSY-6 or JLSY-10
- System voltage: 6kV or 10kV
- PT ratio: 6000/√3 / 100/√3 / 100/3 or 10000/√3 / 100/√3 / 100/3
- CT primary current: 5A to 300A (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
- Installation type: Outdoor pole-mounted
- Quantity