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JLS-35 Combined High Voltage Metering Box – Accurate Measurement at 35kV Level
Accurate, Durable, and Pre-Wired for Fast Deployment
The JLS-35 high-voltage metering box is a compact and integrated combined instrument transformer designed for 35kV three-phase outdoor power distribution systems. It incorporates voltage transformers (VTs) and current transformers (CTs) in a single, weatherproof enclosure for revenue metering and protection purposes.
Compliant with IEC 61869 and GB 1207/1208, the JLS-35 is widely used in utility metering cabinets, solar/wind power access points, mining substations, and industrial parks where high-accuracy and robust performance are essential.
📐 Technical Specifications
| Parameter | Specification |
|---|---|
| Model | JLS-35 |
| Rated Voltage | 35kV |
| Rated Frequency | 50Hz |
| Rated Primary Current | 5A / 10A / 20A |
| Rated Secondary Current | 1A / 5A |
| Voltage Ratio | 35kV/√3 : 100V/√3 |
| Accuracy Class (Metering) | 0.2 / 0.5 |
| Accuracy Class (Protection) | 5P / 10P |
| Insulation Level | 40.5/95/185 kV |
| Ambient Temperature Range | -40°C to +55°C |
| Enclosure | Galvanized steel, painted |
| Installation Type | Outdoor pole or wall-mounted |
| Standard Compliance | IEC 61869-1/2/3, GB 1207/1208 |
✅ Product Highlights
Pre-integrated CT and VT for simplified installation
Supports both metering and relay protection in one box
Hermetically sealed with long-lasting insulation performance
Factory pre-wired secondary terminals, reducing commissioning time
Corrosion-resistant steel shell, IP54-rated for outdoor environments
Compatible with digital monitoring systems and AMI platforms
🏭 Common Applications
Distribution poles in 35kV outdoor lines
Renewable energy grid-tie metering points (solar & wind farms)
Temporary or mobile substations in construction zones
Transformer high-voltage side metering
Mining, petrochemical, and heavy industry grids
🌍 Real Customer Feedback
🗣️ Robert M., Grid Engineer – Hydro-Québec, Canada
“We use JLS-35 units for temporary connections at construction substations. They’re accurate, and the factory wiring saves us hours on site.”
📌 Source: Hydro-Québec Project Notes, 2023
🗣️ Anja B., Procurement Head – Ørsted A/S, Denmark
“Used these in our 35kV wind farm junctions. The built-in accuracy and compact form factor helped streamline the project timeline.”
📌 Source: Ørsted Offshore Grid Expansion Report, 2023
🗣️ Frank T., Utility Consultant – National Grid UK
“The galvanization holds well even in coastal sites. Zero failures over two winters.”
📌 Source: NG Substation Maintenance Review, 2022
🗣️ Miguel A., Project Manager – Iberdrola, Spain
“Excellent delivery speed and the product matched the IEC test results. Highly recommended for 35kV metering upgrades.”
📌 Source: Iberdrola Procurement Feedback, 2024
🗣️ Olivia C., Distribution Planner – AGL Energy, Australia
“We trust the accuracy class ratings on these boxes, and secondary wiring is marked.”
📌 Source: AGL Distribution Engineering Memo, 2022
❓ Frequently Asked Questions
• Can this be used for both protection and billing?
Yes. It supports dual-function metering and relay protection with separate accuracy classes.
• Does it require oil insulation?
No. The CT and VT are dry-type or cast resin, depending on configuration, with no oil required.
• How is it installed in the field?
The box is mounted on a concrete pole, steel frame, or wall, with pre-drilled fixing points and wiring terminals.
• What maintenance is needed?
Minimal. External inspection once a year is sufficient for most environments.
• Is it SCADA-ready?
Yes. It can be connected to remote data acquisition systems via secondary outputs.
📞 Contact for Datasheet or OEM Inquiry
Thor – Electrical Engineer, Wei Shoe Elec
📞 Tel: +86-0577-62788197
📱 WhatsApp: +86 159 5777 0984
📧 Email: thor@weishoelec.com
Choose the JLS-35 metering box for precision, reliability, and ease of integration in your 35kV distribution network.
