As businesses become increasingly reliant on computers and automated processes, the need for uninterrupted operations is more crucial than ever. To ensure the smooth functioning of their electrical systems, companies often face the challenge of maintaining aging switchgears while working within budget constraints. Fortunately, there are several life extension tips that can enhance the reliability and performance of medium voltage switchgears. In this article, we will explore ten essential maintenance practices that can help maximize the lifespan and efficiency of switchgear equipment.

Conduct Infrared Inspections

While not a substitute for a comprehensive maintenance program, thermal imaging, also known as infrared inspections, can be a valuable tool to identify potential issues in switchgear equipment. This non-intrusive technique allows for inspections to be conducted while the equipment is energized. By detecting disconnections and other anomalies, infrared inspections can help prevent equipment outages. It is recommended to install infrared viewing windows to facilitate quick and safe inspections.

Exercise Circuit Breakers Regularly

Regularly exercising circuit breakers is a simple yet effective practice to maintain their optimal performance. By manually operating circuit breakers at least once a year, the contacts can be kept clean and the operating mechanisms can move freely. This preventive measure helps prevent the accumulation of dust and dirt, ensuring the smooth operation of the switchgear.

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Prioritize Recommended Maintenance

Switchgear equipment should undergo routine maintenance to ensure its continued reliability. This includes cleaning, inspection, tightening, lubrication, and exercising of the components. The frequency of maintenance activities depends on the operating conditions and environmental factors such as moisture and heat. Neglecting maintenance can lead to accelerated deterioration of insulation, conductive materials, and protective devices.

Consider Reconditioning the Equipment

In cases where on-site maintenance is insufficient to bring circuit breakers within tolerances defined in industry standards, in-shop reconditioning can be a more intensive maintenance option. This process involves complete disassembly, cleaning, and inspection of the circuit breaker. Damaged parts are refurbished or replaced, and pivot points are re-lubricated. After reassembly, the reconditioned circuit breaker is tested against relevant ANSI standards to ensure its reliability.

Maintain Detailed Records and Track Performance

To effectively manage the maintenance of switchgear equipment, it is crucial to keep accurate records and track performance over time. Without proper documentation and monitoring, degradation of insulation and moving parts may go unnoticed. By tracking test data and analyzing trends, facility managers can gain insights into the expected lifespan of the equipment and focus maintenance efforts on critical areas.

Explore Equipment Upgrades

With the continuous advancements in circuit breaker technology, older switchgear models may no longer be sustainable solutions. Upgrading the switchgear lineup with the latest state-of-the-art circuit breakers can enhance performance, reliability, and safety. Alternatively, for a more cost-effective approach, existing switchgear structures and bussing can be retained while only upgrading the circuit breakers themselves.

Consider Outsourcing Preventive Maintenance

Performing all the required maintenance activities for an electrical distribution system can be challenging for most companies. Engaging a qualified electrical maintenance contractor through a long-term service agreement can ensure that preventive maintenance is carried out on schedule and in compliance with industry standards. This approach helps prevent oversight and ensures standardized work scopes throughout the agreement.

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Comply with Industry Standards and Recommendations

To maintain electrical safety in the workplace, it is essential to comply with relevant industry standards such as NFPA 70E: Standard for Electrical Safety in the Workplace. This includes following the recommendations outlined in NFPA 70B: Recommended Practice for Electrical Equipment Maintenance and the manufacturer’s guidelines. Adhering to these standards helps mitigate risks and ensures the reliable operation of switchgear equipment.

Harness the Power of Predictive Maintenance Tools

In addition to traditional maintenance methods, predictive maintenance tools can provide valuable insights into the health and condition of switchgear equipment. These tools utilize techniques such as trending test data analysis and online monitoring systems to detect potential failures and provide early warnings. By leveraging predictive maintenance, facility managers can proactively address issues before they escalate into major problems.

Short Circuit Analysis and Coordination Studies

To safeguard both the switchgear and the surrounding area, it is crucial to perform a short circuit analysis. This analysis determines whether the switchgear components have the appropriate short circuit rating to handle potential faults. Additionally, updating the coordination study ensures that circuit breaker settings are properly coordinated to prevent unnecessary interruptions caused by faults.

Switchgear equipment and power distribution systems are not designed to operate indefinitely without proper maintenance. By implementing these ten tips for maintaining the reliability of medium voltage switchgears, businesses can extend the lifespan and enhance the performance of their electrical systems. With a proactive approach to maintenance, downtime can be minimized, and operations can continue smoothly and efficiently.