JLSZY6-6, JLSZY6-10 Three Phase AC Combined Transformer Metering Box CT PT

Product Overview

JLSZY6-6, JLSZY6-10 is an outdoor three-phase AC combined transformer metering box for medium-voltage distribution systems. It integrates current transformer (CT) and voltage transformer (PT/VT) functions in one epoxy cast-resin assembly, providing current and voltage signals for high-voltage energy metering.

This product is suitable for 6kV and 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.

Product Display

Application Position

JLSZY6-6/10 is installed at the medium-voltage metering point of a 6kV or 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.

Main Applications

• 6kV and 10kV outdoor distribution networks
• 7.2kV and 12kV class high-voltage metering systems
• Pole-mounted combined transformer metering boxes
• Outdoor metering cabinets and compact substations
• Active and reactive energy measurement for utility revenue
• Industrial user metering and load monitoring
• Projects requiring integrated CT and PT signals in one outdoor unit

Application Case Studies

Application Scenario 1: Outdoor Utility Metering
Utility companies deploy combined transformer metering boxes at 6kV and 10kV distribution points for revenue billing. The integrated CT and PT design provides both current and voltage signals to energy meters in a single outdoor unit. The epoxy cast-resin insulation ensures reliable performance in outdoor environments with temperature variations and humidity exposure.

Application Scenario 2: Industrial Distribution Metering
Industrial facilities with 6kV or 10kV incoming supply require accurate energy measurement for cost allocation and load monitoring. The combined transformer metering box integrates CT and PT functions, reducing installation complexity and wiring requirements. The 190mm or 280mm structure options accommodate different cabinet layouts and installation space constraints.

Application Fit

Suitable For

• Outdoor 6kV and 10kV metering points requiring integrated CT and PT signals
• Utility and industrial revenue metering systems
• Outdoor pole-mounted metering installations
• Compact substations and outdoor metering cabinets
• Projects requiring 190mm or 280mm outline versions
• Medium-voltage energy metering with 5A to 300A primary current range
• Applications requiring 5A or 1A secondary current output

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
• Oil-immersed combined transformer requirements

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)
• Structure options: Confirm 190mm or 280mm version before cabinet design
• Grounding: Connect grounding terminal per local electrical codes and metering standards
• Maintenance: Inspect primary terminals, secondary terminal box sealing, resin surface and grounding connection periodically

Technical Parameters

The JLSZY6-6/10 is an outdoor epoxy cast-resin combined transformer metering box for 6kV and 10kV systems. Operating temperature -15°C to +55°C, altitude up to 4500m, compliant with GB20840.4-2015. Available in 190mm and 280mm structure options.

Voltage Transformer Data

Current Transformer Data

Installation & Dimensions

Dimension Reference

Wiring DiagramInstallation 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

Standards ComplianceCompliant 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 GuideSelect by system voltage: Use JLSZY6-6 for 6kV systems (7.2kV class) and JLSZY6-10 for 10kV systems (12kV class).Select by structure size: Choose 190mm version for compact metering box layout. Choose 280mm version when wider spacing or larger body arrangement is required.Select by current ratio: Determine CT primary current according to actual load current. Supports 5A to 300A primary current, with 5A or 1A 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 6/√3 / 0.1/√3 / 0.1/3, 10/√3 / 0.1/√3 / 0.1/3 or 11/√3 / 0.11/√3 / 0.11/3 according to network voltage and meter input requirement.Ordering InformationWhen ordering, please specify:

• Model: JLSZY6-6 or JLSZY6-10
• Structure version: 190mm or 280mm
• System voltage: 6kV or 10kV
• PT ratio: 6000/√3 / 100/√3 / 100/3V or 10000/√3 / 100/√3 / 100/3V
• CT primary current: 5A to 300A
• CT secondary current: 5A or 1A
• CT accuracy class: 0.2S, 0.2, or 0.5
• PT accuracy class: 0.2 or 0.5
• Quantity

FAQs