Combined measurement for outdoor medium-voltage circuits

The JLSZ(YN)-6,10 6kV 10kV Three-Phase Outdoor Combined Current & Voltage Transformer Cast Resin series combines current-transformer and voltage-transformer functions in one three-phase, epoxy-resin-cast outdoor unit. It provides a selection starting point for medium-voltage measurement arrangements where the final electrical configuration, secondary circuit, and installation drawing must be agreed before order release. The supplied material identifies related JLSZY and JLSZV constructions, so family-level information should not be treated as proof that every figure applies to every variant.

The key selection question is which voltage system, voltage ratio, current range, accuracy class, rated output, insulation level, wiring arrangement, and physical drawing match the complete installation. A combined arrangement can simplify the measurement interface, but it does not remove the need to coordinate metering, protection, grounding, terminals, cable routing, and clearance requirements.

Published configuration information

The supplied material describes 6 kV and 10 kV versions. JLSZV information lists 6000/100 V for the 6 kV version and 10000/100 V for the 10 kV version; another drawing also lists a 10000/100 V voltage-transformer ratio. Match these figures to the selected model rather than transferring them between drawings. Published insulation information for one drawing is 7.2/32/60 kV at 6 kV and 12/42/75 kV at 10 kV. One drawing also states 50 Hz or 60 Hz, an ambient range of −25 °C to +40 °C, and pollution Class IV.

The standards references are technical anchors, not a substitute for verifying the applicable edition, test clauses, local grid rules, or approval requirements. If a project requires a defined test package, certification, or authority document, include that requirement in the inquiry rather than assuming it from a series reference.

Ratio, accuracy, and burden

Published current-transformer tables cover primary-current groups from 10–300 A, 400–600 A, and 800 A in one drawing, while another JLSZV table extends from 7.5–10–15 A through 600–800–1000 A. The material lists 10 VA at specified 0.2s, 0.5s, and 0.5 entries. Voltage-transformer information includes 0.2 and 0.5 classes with 15 VAC and 30 VAC in one drawing; another table lists 0.2-2×15, 0.5-2×30, Class 1-2×80, Class 3-2×200 VA, and a 2×400 VA limit output.

These entries are not interchangeable menu labels. Select primary current, voltage ratio, accuracy class, and burden against the actual meter, relay, secondary wiring, and expected duty. A lower or higher value is not automatically better when it does not suit the connected circuit. If the project needs a transformer ratio test or another acceptance activity, specify its scope in procurement documentation; the supplied material does not establish a particular procedure.

Functional features to evaluate

• Integrated current and voltage measurement: the series brings both instrument-transformer functions into a three-phase outdoor arrangement.
• Cast-resin construction: the supplied title and description identify epoxy-resin-cast construction for the product family.
• Model-dependent 6 kV and 10 kV selection: published voltage, ratio, and insulation data support structured model review.
• Metering-oriented accuracy and output choices: cited tables provide accuracy and burden data to match to the secondary application.
• Drawing-based installation planning: available drawings provide model-specific dimensions and mounting information for layout confirmation.

JLSZ(YN)-6,10 6kV 10kV Three-Phase Outdoor Combined Current & Voltage Transformer Cast Resin should be evaluated as part of the measurement system, not as an isolated item. Protection settings must coordinate across upstream and downstream equipment. Where measurement information interfaces with relays or feeder automation, qualified personnel should review the secondary arrangement, polarity, grounding approach, commissioning plan, and switchgear arc flash protection requirements for the overall system.

Outdoor installation and drawing checks

The W designation is described as outdoor installation. The JLSZY drawing shows upper bushings labelled AP1, BP1, and CP1, a 660 mm overall width, 600 mm base length, 422 mm overall height, and four Ø14 mounting holes with a 400 mm centre distance. The JLSZV drawing shows a 650 mm overall width, 427.5 mm overall height, 279 mm base width, and a 435 mm by 405 mm plan envelope. These are drawing-specific values, so confirm them against the final ordered model.

A common planning error is to allocate only the nominal footprint. Cable-entry zones, terminal access, mounting positions, safe working clearance, and maintenance access can govern whether an installation is workable. Similarly, rated environmental figures are useful only when local temperature, pollution conditions, altitude, enclosure arrangement, and network frequency have been reviewed. If site conditions differ from printed assumptions, record them in the request for technical confirmation.

JLSZY drawing dimensions

JLSZV drawing dimensions

Typical application context

Subject to confirmation of the selected model and secondary arrangement, this series can be considered for outdoor medium-voltage distribution circuits, metering interfaces, and distribution equipment requiring integrated current and voltage measurement. It may be relevant where feeder automation or protection review forms part of the wider distribution design, but those functions depend on the confirmed system architecture and are not claimed as built-in product capabilities.

For a site with a defined meter or relay scheme, start with nominal voltage, requested wiring form, voltage ratio, primary-current range, required accuracy class, burden, frequency, installation drawing, ambient conditions, standards, and documentation package. For a replacement or upgrade project, establish the existing secondary-circuit arrangement and physical constraints before comparing variants.

Inquiry checklist

1. State whether the required system is 6 kV or 10 kV.
2. Identify the requested JLSZY or JLSZV model or wiring form.
3. Provide voltage ratio, primary-current range, secondary arrangement, accuracy class, and rated output or burden.
4. Attach the installation drawing or state mounting and clearance constraints.
5. Describe frequency, temperature, pollution, altitude, and other site conditions.
6. List standards, test expectations, authority documents, and commissioning requirements.
7. Include a transformer connection diagram where the secondary circuit is defined.

JLSZ(YN)-6,10 6kV 10kV Three-Phase Outdoor Combined Current & Voltage Transformer Cast Resin provides a documented basis for configuring an outdoor combined instrument-transformer solution. Final suitability depends on a verified model, drawing, electrical duty, and project conditions. Request confirmation against final technical documentation before procurement or energization.