Switchgear Intelligent Monitoring System: Toward a New Era of Digitization and Active Early Warning

What is Switchgear Intelligent Monitoring System?

Switchgear Intelligent Monitoring System is a comprehensive solution integrating advanced sensor technology, data communication and intelligent analysis software, aiming at all-weather and all-round on-line monitoring of the operation status of high-voltage switchgear. It has completely changed the traditional operation and maintenance mode of relying on manual periodic inspection, and realized the leap from “passive maintenance” to “active warning” and “predictive maintenance” through real-time data collection and intelligent diagnosis. Through real-time data collection and intelligent diagnosis, it realizes the leap from "passive maintenance" to "active early warning" and "predictive maintenance", and is the modernized cornerstone for guaranteeing the safety of power grids and improving the efficiency of operation and maintenance.

Why switchgear needs intelligent monitoring?

High voltage switchgear, as the core control and protection unit in the power system, has a complex internal structure and a closed operating environment, which is a high incidence of failure. There are many pain points in the traditional operation and maintenance mode:

• Monitoring blind spots:Manual inspections are unable to peer into the true state of key areas such as contacts and busbar connections inside the cabinet.
• Poor timeliness:Serious hazards may have occurred and developed between regular inspections.
• Risky:“Operations such as ”opening the cabinet to measure the temperature" pose a significant safety risk.
• Inefficiency:Relying on human labor is costly and does not accurately determine equipment health.

Intelligent monitoring systems are designed to solve these problems by “sensing” the health of the switchgear in real time, and issuing warnings at the budding stage of a fault.

Core Monitoring Module: Multi-dimensional Sensing of Device Status

A well-established intelligent monitoring system usually contains the following key monitoring modules:

1. Temperature monitoring (fluorescent fiber optic technology)

Circuit breaker plum blossom contacts, busbar laps, cable joints, etc. inside the switchgear cabinet are the key nodes for carrying large currents, and are also the parts most susceptible to abnormal heating due to increased contact resistance. Overheating is the main culprit that leads to insulation damage, equipment burnout and even fire.

In this application scenario, theFluorescent fiber optic temperature measurement technologyWith its unparalleled advantages, it is the most ideal choice:

• Intrinsically safe and fully insulated:The sensing probe and fiber optic are non-metallic media with extremely high insulating properties and can be installed directly on charged bodies up to 35kV or even higher voltage levels without any electrical creepage or safety hazards.
• Super anti-electromagnetic interference:Extremely strong electromagnetic fields exist inside the switchgear cabinet, and wireless temperature measurement and other methods are susceptible to interference leading to data jumps or loss of connection. Fluorescent optical fiber uses light as the signal carrier and is completely immune to any electromagnetic interference (EMI), ensuring the absolute accuracy and stability of data in harsh environments.
• Temperature measurement is precise and goes right to the core:With contact mounting, it measures the core temperature at the conductor connection point, not the surface temperature, for true and reliable data and fast response time.
• Long life, maintenance free:The fiber optic sensor itself is passive, corrosion-resistant, aging-resistant, and once installed, it can be operated with the switchgear for the same life span without the need to replace batteries and other post maintenance.

By deploying the fluorescent fiber optic temperature measurement system, O&M personnel can grasp the temperature change curve of each key connection point in real time, and accurately predict early failures such as loose connections or oxidation.

2. On-line monitoring of partial discharges

Partial discharge is the most important symptom of the deterioration of the insulation condition inside the switchgear. When air gaps, cracks or fouling occur in the insulation, a weak discharge is generated under high voltage. Such discharges continue to damage the insulation structure and can eventually lead to catastrophic breakdown short-circuit accidents. By deploying ultra-high frequency (UHF) sensors or transient earth voltage (TEV) sensors in cabinets, localized discharge signals can be effectively captured, enabling early warning of insulation condition.

3. Online monitoring of mechanical properties

The breaking and closing mechanism of the circuit breaker is the “heart” of the switchgear. By monitoring the current waveform of the breaking and closing coil, the working status of the energy storage motor, and the travel and speed of the circuit breaker contacts and other parameters, we can determine whether there are mechanical failures such as jams, wear and tear, and insufficient energy storage in the mechanism, which will provide key data for the realization of predictive maintenance.

4. Online environmental monitoring

The environment inside the cabinet has a significant impact on the operation of the equipment. By monitoring the temperature and humidity inside the cabinet and linking it with the heating and moisture repellent device, condensation can be effectively prevented. For GIS (gas-insulated switchgear), it is also necessary to monitor the density and micro-water content of SF6 gas in real time to ensure its insulation and arc extinguishing performance.

Intelligent Diagnostics and Analytics Platform

The data collected by all the sensors are finally gathered to the intelligent diagnosis and analysis platform in the background. The platform is not only capable of real-time data display and over-limit alarms, but more importantly, it can utilize big data and artificial intelligence algorithms to:

• Data fusion analysis:Combine temperature, local discharge, mechanical characteristics and other multi-dimensional data to comprehensively determine the health status of the equipment.
• Trend prediction:Analyze historical data, predict failure trends, and give window periods for maintenance recommendations.
• Fault localization and diagnosis:Through feature mapping analysis, it helps O&M personnel to quickly locate fault points and determine fault types.
• Visual presentation and remote access:Provide friendly graphical interface, support multi-terminal remote access such as computer, cell phone, etc. to realize unattended operation.

Choose us to enter the new era of intelligent operation and maintenance.

A stable and reliable intelligent monitoring system is the strongest guarantee for the safety of your power assets. Our company is deeply engaged in the field of condition monitoring of electric power equipment, especially in the most demandingFluorescent fiber optic temperature measurement technologyWe have industry-leading core technologies and rich application experience.

We provide not only products, but also a full set of turnkey solutions from site survey, program design, installation and construction to post data analysis. Our systems have been successfully applied in many key industries, helping our customers to prevent a number of major hazards.

If you are looking for a solution to improve the safety level of your switchgear and optimize the efficiency of your operations and maintenance, contact our technical experts today. We will customize an intelligent monitoring system that best suits your needs and puts the status of your equipment at your fingertips!