Product Overview
JLSZY8-10W/340 is an outdoor three-phase three-component combined transformer metering box for 10kV medium-voltage distribution systems. It integrates current transformer (CT) and voltage transformer (PT/VT) functions in one epoxy cast-resin assembly with metal enclosure protection, providing current and voltage signals for high-voltage energy metering.
This product is suitable for 10kV three-phase AC distribution networks. It is commonly used in outdoor metering points, pole-mounted metering equipment, compact substations and user-side high-voltage metering systems. The product supports active and reactive energy measurement through integrated CT and PT secondary outputs with 340mm terminal spacing for enhanced insulation performance.
Product Display
Application Position
JLSZY8-10W/340 is installed at the medium-voltage metering point of a 10kV distribution line. 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. The metal enclosure provides additional protection against environmental factors and mechanical damage.
Main Applications
- 10kV outdoor distribution networks requiring three-phase three-component metering
- 12kV class high-voltage metering systems with enhanced insulation requirements
- Pole-mounted combined transformer metering boxes with metal enclosure protection
- Outdoor metering cabinets in industrial and commercial facilities
- Active and reactive energy measurement for utility revenue billing
- Industrial user metering with high pollution level environments
- Applications requiring 340mm terminal spacing for improved creepage distance
Application Case Studies
Application Scenario 1: Industrial Distribution Metering
Industrial facilities with 10kV incoming supply require accurate energy measurement for cost allocation and load monitoring. The three-phase three-component design provides complete voltage and current measurement for all three phases, ensuring balanced metering accuracy. The metal enclosure protects the internal components from dust, moisture and mechanical impact in harsh industrial environments.
Application Scenario 2: High-Pollution Area Metering
Coastal and industrial areas with high pollution levels require enhanced insulation performance. The 340mm terminal spacing provides increased creepage distance, reducing the risk of flashover in contaminated environments. The epoxy cast-resin insulation combined with metal enclosure protection ensures reliable long-term operation in challenging conditions.
Application Fit
Suitable For
- Outdoor 10kV metering points requiring three-phase three-component CT and PT signals
- Utility and industrial revenue metering systems with metal enclosure protection
- Outdoor pole-mounted metering installations in polluted environments
- Compact substations and outdoor metering cabinets requiring 340mm terminal spacing
- Medium-voltage energy metering with 5A to 300A primary current range
- Applications requiring enhanced creepage distance for high-pollution areas
- Projects requiring metal enclosure protection for mechanical and environmental safety
Not Recommended For
- Indoor-only compact switchgear applications where indoor combined transformers are preferred
- Large-current applications above 300A without technical confirmation
- Applications requiring separate CT and PT bodies instead of integrated metering box
- Protection-only CT applications where metering accuracy is not required
- 6kV system applications (use JLSZY8-6W model instead)
Installation Conditions
- Installation position: Outdoor pole-mounted, outdoor metering box, compact substation or user-side metering point
- Ambient temperature: -15°C to +55°C
- Maximum altitude: ≤ 4500m (no derating required)
- Terminal spacing: 340mm for enhanced creepage distance and insulation performance
- Grounding: Connect grounding terminal per local electrical codes and metering standards
- Maintenance: Inspect primary terminals, secondary terminal box sealing, metal enclosure condition and grounding connection periodically
Technical Parameters
The JLSZY8-10W/340 is an outdoor epoxy cast-resin combined transformer metering box for 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 340mm terminal spacing and metal enclosure protection.
Voltage Transformer Data
| Rated Voltage Ratio | Accuracy Class | Rated Output | Rated Insulation Level (kV) |
|---|---|---|---|
| 10000/√3 / 100/√3 / 100/3V | 0.2 / 0.5 | 40VA | 12/40/75 |
Current Transformer Data
| Rated Current Ratio | Accuracy Class | Rated Output | Short-Time Thermal Current (1s) | Dynamic Withstand Current |
|---|---|---|---|---|
| 5A to 300A / 5A | 0.2S | 15VA | 60 × In | 150 × In |
| 5A to 300A / 5A | 0.2 | 15VA | 60 × In | 150 × In |
| 5A to 300A / 5A | 0.5 | 20VA | 60 × In | 150 × In |
Installation & Dimensions
Dimension Reference
| Model | Key Dimensions | Approximate Weight | Application Note |
|---|---|---|---|
| JLSZY8-10W/340 | Front width 950mm; side depth 340mm; height 761mm | 82kg | 340mm terminal spacing for enhanced insulation |
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
- Metal enclosure must be properly grounded for safety
Standards Compliance
Compliant 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 JLSZY8-10W for 10kV systems (12kV class).
Select by terminal spacing: Choose 340mm version for enhanced creepage distance in high-pollution environments.
Select by current ratio: Determine CT primary current according to actual load current. Supports 5A to 300A primary current, with 5A secondary current.
Select by metering accuracy: Use 0.2S CT accuracy for higher-accuracy energy metering. Use 0.2 or 0.5 according to metering specification.
Select by voltage ratio: Choose 10/√3 / 0.1/√3 / 0.1/3 according to network voltage and meter input requirement.
Ordering Information
When ordering, please specify:
- Model: JLSZY8-10W/340
- System voltage: 10kV
- PT ratio: 10000/√3 / 100/√3 / 100/3V
- CT primary current: 5A to 300A
- CT secondary current: 5A
- CT accuracy class: 0.2S, 0.2, or 0.5
- PT accuracy class: 0.2 or 0.5
- Quantity
FAQs