This solution addresses the power supply pain points of main overhead distribution networks in suburban and township areas. Adhering to the principles of basic practicality and cost-effectiveness priority, it provides a full-process solution covering Automatic Circuit Recloser selection, installation, commissioning, and operation & maintenance. The solution aims to improve power supply stability, match grassroots O&M capabilities, and reduce operating costs.
1.Background & Core Pain Points
General outdoor overhead distribution networks undertake basic power supply tasks, and currently face four major pain points:
- Frequent faults & slow recovery: Faults occur frequently due to natural environments. Old reclosers have poor stability and low reclosing success rates, resulting in long manual recovery time and affecting user power supply.
- Insufficient equipment reliability: Old equipment has non-standard manufacturing, substandard arc extinguishing and insulation performance, easy aging and jamming, and poor adaptability, failing to meet basic operation requirements of 12kV~24kV and 400A~1250A.
- Low and non-standard O&M efficiency: Weak grassroots O&M force, lack of standardized processes, incomplete equipment files, blind hidden danger detection, and repeated faults.
- Unbalanced cost-performance ratio: High-end equipment has redundant functions and high costs; low-cost equipment has poor reliability and short service life, neither meeting the demand for "low cost, high reliability".
2.Core Solution
Centered on basic practicality, strong adaptability, and simple O&M, a full-process solution for Automatic Circuit Recloser is established as follows:
Product Selection: Adaptable & Practical, Balancing Reliability and Cost-Effectiveness
Based on the operation requirements of general distribution networks, basic practical Automatic Circuit Reclosers are selected with the following standards:
- Parameter adaptation: Rated voltage 12kV~24kV, rated current 400A~1250A, short-circuit breaking current ≥16kA, matching line load and voltage requirements.
- Technical support: Adopts vacuum interrupter technology; insulation level complies with IEC standards (IEC 62271-111); enclosure protection degree ≥ IP65, adapting to outdoor environments and ensuring reliable and universal operation.
- Practical functions: Equipped with basic electronic control unit, supporting 1~2 adjustable reclosing times, with fault detection and local alarm functions.
- Cost-effectiveness priority: Service life ≥15 years, failure rate ≤0.5 times/year, standardized accessories, reducing procurement and O&M costs.
Installation & Commissioning: Standardized Construction for Reliable Operation
Professional teams carry out construction in accordance with specifications:
- Pre-installation Preparation：On-site survey to confirm compliant installation location and matched parameters; inspect equipment and accessories; implement construction safety protection.
- Standardized Installation：Pole-mounted installation at height ≥4.5m with firm fixation; standard wiring and earthing with earthing resistance ≤4Ω; sealed and waterproof treatment for enclosure and wiring points.
- Commissioning & Acceptance：Adjust reclosing parameters; conduct no-load, short-circuit and reclosing tests; organize tripartite acceptance, file records and establish equipment archives.
Operation & Maintenance: Standardized Management for Higher Efficiency & Lower Costs
A simple and operable O&M mechanism is established for grassroots capabilities:
- Basic Inspection Mechanism：Routine inspection every 6 months, special inspection after extreme weather; focus on sealing, insulation, wiring and earthing; complete and file inspection records.
- Fault Handling Process：Local alarm activated on fault; transient faults automatically restored by reclosing; permanent faults handled manually before reset; record and analyze fault information.
- Equipment Maintenance & Archives Management：Comprehensive annual maintenance; establish electronic + paper equipment archives; provide special training for grassroots O&M personnel to improve operation skills.
3. Solution Advantages
- Outstanding cost-effectiveness: Focus on basic functions, controllable procurement and maintenance costs, high long-term value.
- Strong adaptability: Matched parameters and outdoor environment, high reclosing success rate, effectively improving power supply reliability.
- Strong implementability: Simple installation and O&M processes, suitable for grassroots teams without high-end equipment or professional teams.
- Standardized & traceable: Full-process standardization, full life cycle traceability, convenient for management optimization.
- High practicability: Targets core pain points, fast implementation, ensuring basic power supply demand.
4. Implementation Plan & Support
Implementation Plan
- Preparatory stage: Complete survey, selection, procurement and team training.
- Installation & commissioning: Standardized construction, testing, acceptance and filing.
- O&M implementation: Launch standardized O&M, regular training and optimization.
Implementation Support
- Quality assurance: Qualified products, standardized construction and acceptance, quality traceability system.
- Technical support: Professional technical guidance, regular O&M training.
- After-sales support: Signed after-sales agreement, responsive fault repair and accessory replacement.
5. Summary
This solution provides a basic, practical and cost-effective full-process solution for general overhead distribution networks. Through scientific selection, standardized installation and O&M, it effectively solves problems such as frequent faults, slow recovery and inefficient O&M. It is suitable for grassroots implementation and provides a strong guarantee for the safe and stable operation of distribution networks.
