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Case Studies

Supply records · Qualifications · Buyer reference

Case Studies

Project references for Jiangxi Juliu Electric Co., Ltd. — the manufacturing group behind export-facing brand Jiangxi Tuosen Electric. Use this page to evaluate a distribution-line insulator supplier for overseas procurement.

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Overhead power transmission lines against sky
  • 15 working days
    domestic lead time*
  • State Grid
    supplier verified
  • 75 tenders
    participations to 2026
  • Multi-province
    utility supply

Insulator Project Case Studies

Overhead distribution line infrastructure

Shanxi · ShilouAwarded15 working days

Case 1 — 10 kV Line Rehabilitation Insulator Supply — Shilou, Shanxi, China

  • Customer type: Local utility / public power company
  • Scope: Equipment and materials procurement for 10 kV Luo Village and related line rehabilitation projects in Shilou County; Lot 009 insulator package
  • Result: Awarded supplier
  • Evaluation: Overall score 92.86; ranked No. 1

Buyer takeaway: Relevant to 10 kV overhead distribution rehabilitation. Shows competitiveness in both technical and commercial evaluation, plus fast domestic delivery capability.

Engineering and procurement workspace context

Shanxi Local Power2023Awarded

Case 2 — Rural Grid Consolidation & Upgrade Insulator Procurement — Shanxi Local Power, 2023

  • Customer type: Provincial local power company
  • Scope: 2023 rural grid consolidation & upgrade equipment/materials Lot 009 — insulator procurement
  • Result: Awarded supplier

Buyer takeaway: Rural grid projects demand weather resistance, mechanical strength and long-term reliability. Entry into this supply chain indicates fitness for long-running distribution duty.

Solar and utility infrastructure landscape

Shanxi Local Power20241st candidate

Case 3 — 2024 Rural Grid Consolidation & Upgrade Insulators & Related Materials — Shanxi Local Power

  • Customer type: Provincial local power company
  • Scope: 2024 rural grid consolidation & upgrade equipment/materials Lots 6 / 9 / 13 (second tender); Lot 008 insulators and related equipment
  • Result: First-ranked bid candidate
  • Lead time: Within 15 working days after contract signing

Buyer takeaway: Ranked first in open tendering — reflecting a combined advantage in price, technical proposal, contract performance and delivery cycle.

Renewable and grid infrastructure

Shanxi Local Power20253rd candidate

Case 4 — 2025 Rural Grid Consolidation & Upgrade Insulator Procurement — Shanxi Local Power

  • Customer type: Provincial local power company
  • Scope: 2025 rural grid consolidation & upgrade major equipment/materials procurement; Lot 017 insulators and related items
  • Result: Bid candidate list; ranked No. 3

Buyer takeaway: Multi-year participation with the same customer on rural grid upgrade programs indicates continuing delivery track record and customer recognition.

Electrical infrastructure and cabling

Inner Mongolia · XuejiawanFrameworkAwarded

Case 5 — Framework Supply for ≤10 kV Customer Expansion Grid Projects — Xuejiawan, Inner Mongolia

  • Customer type: Power supply company under Inner Mongolia Power Group
  • Scope: 2025 Batch 2 framework tender for ≤10 kV customer-expansion grid equipment/materials; insulator lot
  • Result: One of the awarded suppliers

Buyer takeaway: Framework tenders typically require strong qualification, quality systems, performance history and long-term supply stability. Applicable to ≤10 kV distribution expansion packages.

Industrial manufacturing and heavy equipment context

Inner Mongolia · HohhotPorcelainCandidate

Case 6 — Porcelain Insulator Framework Procurement for ≤10 kV Expansion Projects — Hohhot, Inner Mongolia

  • Customer type: Power supply company under Inner Mongolia Power Group
  • Scope: 2025 framework agreement procurement for ≤10 kV customer-expansion equipment/materials Lot 138 — porcelain insulators
  • Result: Bid candidate

Buyer takeaway: Porcelain insulators applied in northern cold-climate distribution networks — useful for buyers assessing fitness for similar climates and distribution scenarios.

High-voltage transmission tower and insulator strings

Qinghai · Gansu · HunanState Grid

Case 7 — Multi-Province Utility Insulator Supply — Qinghai, Gansu, Hunan

  • Customer type: State Grid provincial utility materials companies / provincial power companies
  • Products & timing:
    • State Grid Qinghai Electric Power Materials Co.: shackle (butterfly) insulators — March 2025
    • State Grid Gansu Electric Power Materials Co.: shackle (butterfly) insulators — April 2024
    • State Grid Hunan Electric Power Co., Ltd.: AC porcelain disc suspension insulators — August 2024

Buyer takeaway: Products have entered the materials supply systems of multiple State Grid provincial companies, covering shackle and AC porcelain disc suspension types for distribution and transmission applications.

Qualifications, Technology & Supply Capability

State Grid supplier qualification verification

In January 2023, under arrangements by State Grid Corporation of China, State Grid Henan Electric Power Company organized a special verification of 2022 insulator supplier qualification-capability information. Jiangxi Juliu Electric Co., Ltd. was listed among verified insulator suppliers.

Buyer takeaway: State Grid and its provincial companies are China’s primary grid operators, with strict supplier admission and tendering processes. Passing such verification is a useful reference for supplier qualification and quality-management capability.

Insulator-related patents

  • High-altitude insulator installation robot: Publication No. CN120414351A — moves along insulator string length for installation work, with fall-prevention devices.
  • Automated insulator cleaning equipment: Publication No. CN120155390A — open-loop design enabling cleaning without dismantling the insulator, improving maintenance efficiency.

Buyer takeaway: Capability extends beyond product supply into installation, O&M and cleaning technology.

Product range

  • High- and low-voltage electrical porcelain
  • Porcelain insulators
  • Porcelain-composite insulators
  • Composite (polymer) insulators
  • Toughened glass insulators

Typical applications: ≤10 kV distribution lines, rural grid upgrades, customer-expansion packages and line rehabilitation projects.

Industrial engineering and production environment
Industrial facility and logistics context

Customers & Coverage

Jiangxi Juliu Electric Co., Ltd. was founded in 2017 in Luxi County, Pingxiang, Jiangxi Province, and specializes in R&D, manufacturing and sales of high- and low-voltage porcelain insulators for transmission and distribution lines. Jiangxi Tuosen Electric serves as the export-facing window for overseas buyers.

ShanxiInner MongoliaQinghaiGansuHunan

  • Shanxi Local Power Co., Ltd.
  • Xuejiawan and Hohhot power supply companies under Inner Mongolia Power (Group) Co., Ltd.
  • State Grid Qinghai Electric Power Company
  • State Grid Gansu Electric Power Company
  • State Grid Hunan Electric Power Co., Ltd.

As of 2026: 75 tender participations; 7 patent records; 2 trademark records; 14 administrative licenses.

Key Points for Overseas Buyers

  • Product types: porcelain, shackle (butterfly), AC porcelain disc suspension, porcelain-composite, composite and toughened glass insulators.
  • Applications: ≤10 kV distribution, rural grid upgrades, customer-expansion packages, line rehabilitation.
  • Supply record: Deliveries to utility customers in Shanxi, Inner Mongolia, Qinghai, Gansu and Hunan, China.
  • Lead time: Some domestic projects delivered within 15 working days after contract signing.
  • Qualification: Passed State Grid provincial insulator supplier qualification-capability verification.
  • Technology: Patents covering insulator installation robots and automated cleaning equipment.
  • Discussion items: specifications, datasheets, packing, lead time, factory audit and supply-performance documentation.

Note: Export orders require additional time for international logistics, customs clearance and local transport. Product standards, certification requirements and test reports can be aligned to each project. *Domestic lead time shown above.

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Scene photos: Unsplash (illustrative; not project site photography).