Product Overview
The JLSZV2-6W and JLSZV2-10W are three-phase exterior epoxy resin cast combined instrument transformers that integrate both current (CT) and voltage (PT) transformation within a single compact housing. These multi-function induction devices are engineered for demanding environments, including high-altitude deployments, and support dual configurations—Standard Type and Load Control Type—to fulfill diverse utility metering, industrial energy measurement, and load control requirements.
Suitable for 50Hz or 60Hz three-phase AC power distribution systems with rated voltages of 6kV or 10kV, this medium voltage instrument transformer is typically mounted on the high-voltage side of a distribution transformer or housed in an outdoor metering cabinet. Here, active and reactive energy meters directly interface with the unit to perform precise billing-grade energy measurement on the medium-voltage circuit. Its weatherproof design and robust epoxy resin encapsulation ensure reliable operation under harsh climatic conditions.
Product Display
Application Position
The JLSZV2-6W and JLSZV2-10W serve as critical components in the metering segment of 6kV and 10kV medium voltage power distribution networks. Installed on the high-voltage side of distribution transformers or within three-phase outdoor metering units, these instrument transformers enable direct acquisition of voltage and current signals for accurate utility metering and revenue metering purposes. Their certified performance at elevations up to 4500m makes them ideal for deployment in mountainous regions and other high-altitude locations where standard equipment may require derating.
Main Applications
- 6kV/10kV outdoor medium-voltage distribution networks
- High-altitude substations and remote area power systems
- High-voltage energy metering and revenue measurement
- Outdoor metering cabinets and pole-mounted installations
- Load management and demand-side control systems
- Industrial distribution metering with load control integration
- AMR/AMI automated data collection deployments
Application Case Studies
Application Scenario 1: High-Altitude Utility Metering
In mountainous regions at elevations between 3000m and 4500m, utility companies deploy combined transformers for 10kV distribution point metering. The high-altitude environment presents challenges including low atmospheric pressure, wide temperature variations, and high humidity. Epoxy cast-resin insulation provides reliable performance without derating, resisting moisture ingress and surface tracking in demanding conditions. The integrated CT and PT design delivers stable outputs for revenue metering applications.
Application Scenario 2: Industrial Distribution Metering
Heavy industrial facilities with 6kV internal distribution systems require billing-grade energy measurement combined with real-time load monitoring. Combined transformers interface with AMR/AMI metering gateways, enabling granular consumption monitoring and automated demand response. The medium voltage instrument transformer maintains accuracy class 0.2S performance during peak operations with fluctuating motor loads, supporting both utility billing and industrial load management requirements.
Application Fit
Suitable For
- 6kV/10kV medium voltage metering applications
- High-altitude installations up to 4500m without derating
- Integrated PT and CT metering in one unit
- High-voltage side metering before distribution transformers
- Outdoor substations in polluted or humid conditions
- AMR/AMI automated metering systems
- Active and reactive energy measurement for utility revenue
Not Recommended For
- Applications requiring separate independent CT and VT installation instead of one combined unit
- Protection-only CT or protection-only VT applications where metering accuracy is not required
- High-frequency electronic transformer applications
- Systems above 12kV class without technical confirmation
- Applications requiring oil-immersed combined transformers
- Indoor-only installations where outdoor-rated insulation is not needed
- Projects where the installation space cannot support the integrated body and approx. 71kg weight
Installation Conditions
- Installation position: High-voltage side of distribution transformer or outdoor metering cabinet
- Installation method: Outdoor pole-mounted, metering cabinet, or substation installation
- Ambient temperature: -15°C to +55°C
- Maximum altitude: ≤ 4500m (no derating required)
- Grounding: Connect grounding terminal per local electrical codes and metering standards
- Clearance: Reserve space for primary connection, secondary wiring, and maintenance access
Model Variants
The JLSZV2 series is available in two functional variants:
- Standard Type: Optimized for general-purpose energy measurement and system monitoring with balanced accuracy across CT and PT outputs. Suitable for utility metering and basic revenue metering in three-phase medium voltage instrument transformer applications.
- Load Control Type: Features enhanced CT stability and dedicated secondary windings tailored for integration with load management and demand-side control systems, ensuring precise telemetry under variable load conditions. This variant supports advanced AMR AMI metering transformer functionality and is commonly used in industrial distribution metering requiring load control metering transformer capabilities.
Both variants share identical mechanical and electrical ratings but differ in internal winding configuration and terminal labeling to support specific application logic within medium voltage power distribution and three-phase energy measurement systems.
Technical Parameters
The JLSZV2-6/10W is an outdoor epoxy cast-resin combined instrument transformer for 6kV and 10kV metering. Operating temperature -15°C to +55°C, altitude up to 4500m, compliant with GB20840.4-2015.
Voltage Transformer Data
| Model | Ratio (V) | Insulation Level (kV) | Accuracy Classes & Burden | Limit Output |
|---|---|---|---|---|
| JLSZV(F)-6W | 6000/100 | 7.2/32/60 | 0.2 (2×20VA), 0.5 (2×50VA), 1.0 (2×80VA), 3.0 (2×200VA) | 2×400 VA |
| JLSZV(F)-10W | 10000/100 | 12/42/75 | 0.2 (2×20VA), 0.5 (2×50VA), 1.0 (2×80VA), 3.0 (2×200VA) | 2×400 VA |
Current Transformer Data
| Parameter | Range / Value |
|---|---|
| Primary Current (Ip) | 7.5A – 600A (selectable ratios) |
| Secondary Current | 5A (standard) |
| Short-Time Thermal Current (1s) | 1.0kA – 60kA (depends on Ip) |
| Dynamic Withstand Current | 2.5kA – 100kA (depends on Ip) |
Installation & Dimensions
Dimension Reference
| Item | Reference Value |
|---|---|
| Overall length reference | 690mm |
| Main base length | 620mm |
| Body mounting reference | 320mm / 405mm references from drawing |
| Top phase spacing | 225mm + 225mm reference |
| Overall height | 530mm reference |
| Side width reference | 405mm |
| Plan width reference | 300mm |
| Primary terminal bolt | M10 reference |
| Secondary cable outlet | Secondary outlet box and terminal wiring area |
| Approximate weight | 105kg |
Wiring Diagram
Installation Guidelines
Mount vertically on a support structure using the provided base flange. Ensure primary conductors pass centrally through all three CT cores. Connect secondary wiring per terminal diagram—separate metering and protection circuits where applicable. Ground the transformer frame and secondary neutrals per local codes. Avoid mechanical stress on epoxy housing during handling.
Standards Compliance
This transformer complies with:
- GB20840.4-2015: Instrument transformers – Part 4: Additional requirements for combined transformers
- IEC 61869 series (by reference)
Designed and tested for outdoor use with pollution degree III and impulse withstand capability matching system BIL levels.
Selection Guide
When selecting a JLSZV2 model:
- Choose 6W for 6kV systems or 10W for 10kV systems.
- Select Standard Type for basic metering or Load Control Type for AMR/AMI or demand response integration.
- Specify primary current (e.g., 100A, 200A) based on expected load.
- Pick PT accuracy class (0.2 for revenue metering, 0.5/1.0 for monitoring).
- Confirm CT accuracy: 0.2S/0.5S for smart metering, 0.5 for general use.
Ordering Information
Provide the following when ordering:
- Full model number (e.g., JLSZV2-10W)
- Variant: Standard or Load Control Type
- Primary current (e.g., 300A)
- PT ratio and accuracy class (e.g., 10000/100V, 0.2/0.5)
- CT accuracy class (e.g., 0.2S/0.5)
- Special requirements (terminal layout, paint, etc.)