Case Studies
Case Studies
The following project references summarize insulator supply performance, qualification verification and technical capability of 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.
1. Insulator Project Case Studies
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
- Lead time: Within 15 working days after contract signing
- 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.
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.
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.
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.
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.
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.
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.
2. Qualifications, Technology & Supply Capability
2.1 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.
2.2 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.
2.3 Product Range
Product coverage includes:
- 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.
3. Customers & Market 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, leveraging the group’s manufacturing and delivery capability.
Utility customers already served include:
- 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.
4. Key Points for Overseas Buyers
If you are sourcing distribution-line insulators, focus on:
- 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.