Overview
The JLSZY6-6 and JLSZY6-10 are outdoor three-phase AC combined transformer metering boxes designed for 6kV and 10kV medium-voltage distribution systems. These units integrate current transformers (CT) and voltage transformers (PT/VT) into a single epoxy cast-resin insulated assembly, providing accurate current and voltage signals for high-voltage energy metering applications.
Built to meet IEC and GB standards for metering accuracy, the JLSZY6 series supports both active and reactive energy measurement with secondary outputs of 1A or 5A. It is commonly deployed in outdoor utility metering points, pole-mounted installations, compact substations, and industrial user-side metering systems where reliable performance under environmental stress is required.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System Voltage | 6kV / 10kV |
| Primary Current Range | 5A – 300A |
| Secondary Current | 1A or 5A |
| Secondary Voltage | 100V / √3 |
| Accuracy Class (CT) | 0.2S / 0.5S |
| Accuracy Class (PT) | 0.2 / 0.5 |
| Insulation Material | Epoxy cast-resin |
| Frequency | 50Hz |
| Installation Type | Outdoor |
| Application | Revenue metering, load monitoring |
| Structure Options | 190mm, 280mm outline |
| Standards Compliance | IEC 61869, GB/T 20840 |
Construction
The JLSZY6-6 and JLSZY6-10 feature a monolithic epoxy cast-resin construction that encapsulates both the current and voltage transformer cores and windings. This solid insulation provides excellent resistance to moisture, UV exposure, and thermal cycling, making it suitable for harsh outdoor environments. The primary conductors are integrated into the cast body with external bushing terminals for secure connection to the medium-voltage line. Secondary windings are routed to a sealed terminal box with screw-type connectors, ensuring safe and reliable signal output to metering devices. The housing includes mounting brackets compatible with standard pole or cabinet fixtures, and optional versions are available with 190mm or 280mm structural outlines to match different installation requirements.
Technical Parameters
Service 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 designed for 6kV and 10kV systems. It operates within a temperature range of -15°C to +55°C, supports installation up to 4500m altitude without derating, complies with GB20840.4-2015, and features current transformer ratios from 5A to 300A on the primary side with secondary outputs of 5A or 1A.
Voltage Transformer Data
| Rated Voltage Ratio |
Accuracy Class | Rated Output (VA) |
Rated Insulation Level (kV) |
|---|---|---|---|
| 6000/√3 / 100/√3 / 100/3V | 0.2 / 0.5 | 30 | 7.2/32/60 |
| 10000/√3 / 100/√3 / 100/3V | 0.2 / 0.5 | 40 | 12/40/75 |
| 11000/√3 / 110/√3 / 110/3V | 0.2 / 0.5 | 60 | 12/40/75 |
Current Transformer Data
| Rated Current Ratio (A) |
Accuracy Class | Rated Output (VA) |
Short-Time Thermal Current |
Dynamic Current |
|---|---|---|---|---|
| 5A to 300A / 5A or 1A | 0.2S | 15 | 60 × In | 150 × In |
| 5A to 300A / 5A or 1A | 0.2 | 15 | 60 × In | 150 × In |
| 5A to 300A / 5A or 1A | 0.5 | 20 | 60 × In | 150 × In |
Installation & Wiring
Installation Diagram
The JLSZY6-6 and JLSZY6-10 units are designed for outdoor pole or platform mounting. Ensure secure mechanical fixation using the provided mounting brackets and maintain adequate clearance around the unit for safety and ventilation.
Wiring Diagram
- 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
Selection & FAQs
Selection Guide
- Select based on system voltage: JLSZY6-6 for 6 kV systems and JLSZY6-10 for 10 kV systems.
- Ensure the rated primary current of the built-in CT matches your load requirements (common options include 5–600 A).
- Verify the accuracy class meets local utility or regulatory standards (typically 0.2S/0.5S for CT and 0.2/0.5 for PT).
- Confirm the enclosure material—cast-resin insulation is standard for outdoor, high-reliability applications.
- Check that the metering box includes both current transformer (CT) and potential transformer (PT) in a single integrated unit for three-phase AC systems.
Frequently Asked Questions
Q1: Can this combined transformer operate at 4000m altitude without derating?
Yes, it supports installation up to 4500m altitude without requiring derating. It operates within an ambient temperature range of -15°C to +55°C. No additional factory adjustments are needed for high-altitude projects.
Q2: Which accuracy class is available for the voltage transformer?
The voltage transformer provides 0.2 and 0.5 accuracy classes with rated outputs of 30VA or 40VA. Choose the class based on your specific metering requirements. Contact us for custom ratio options.
Q3: What structure options exist for the outdoor metering box?
The unit is available in 190mm or 280mm structural versions. Selecting the correct version is necessary for proper cabinet design. Both options meet standard outdoor metering box dimensions.
Q4: When does this combined transformer require factory acceptance testing?
Testing is required prior to shipment for all customized configurations. The JLSZY6 series complies with GB20840.4-2015 and undergoes strict quality checks. Request the specific test schedule from our sales team.
Q5: How are primary current transformer ratios customized for our project?
Primary CT ratios can be customized from 5A to 300A, with secondary outputs of 5A or 1A. Specific ratio configurations and factory acceptance tests are subject to confirmation. Please provide your single-line diagram for exact specifications.
Q6: Are these combined transformers suitable for compact substations?
Yes, they are specifically designed for outdoor pole-mounted installations, metering boxes, and compact substations. The epoxy cast-resin housing provides necessary protection for user-side metering points. These units integrate both current and voltage transformation in a single enclosure.
Q7: Why is periodic maintenance required for the resin surface?
Periodic inspection ensures the epoxy cast-resin surface and secondary terminal box sealing remain intact. This prevents moisture ingress and maintains the 7.2/32/60 kV insulation level. Visual checks of primary terminals are recommended during standard maintenance windows.
Q8: What insulation level does the 10kV voltage transformer provide?
The 10kV rated insulation level is 7.2/32/60 kV. This epoxy cast-resin construction provides the required dielectric strength for outdoor environments. Contact the manufacturer for detailed type test reports.