Application Scenarios of Switchgear Temperature Monitoring System Based on Fluorescent Fiber Optic Temperature Measurement

The switchgear temperature monitoring system based on fluorescent fiber optic temperature measurement, with its core advantages of anti-strong electromagnetic interference, high voltage insulation, high precision, and adaptation to narrow spaces, is widely used in various scenarios requiring real-time monitoring of critical parts of switchgear temperature, especially suitable for complex power environments that traditional temperature measurement technologies find difficult to cope with. The following are the main application scenario classifications and specific descriptions:

1. Application Scenarios Classified by Voltage Level

1. Medium and High Voltage Switchgear (10kV~35kV)

• Application Scenarios: 10kV/20kV/35kV switchgear (such as KYN28, XGN series) in urban distribution network switching stations, residential distribution rooms, and industrial park distribution rooms.
• Monitoring Focus:
  • Circuit breaker moving and static contacts, isolating switch contacts (excessive contact resistance easily causes overheating, which is a high-incidence fault point);
  • Busbar connection points (copper bar connection points overheat due to oxidation and bolt loosening);
  • Cable terminals (connection parts between cables and switchgear, easily generate heat under long-term load).
• Requirement Characteristics: Medium and high voltage switchgear are numerous and widely distributed, requiring system support for multi-point monitoring (3~6 measuring points per cabinet) and remote centralized data management. The electromagnetic interference resistance of fluorescent fiber optic can avoid electromagnetic pulse effects during circuit breaker switching.

2. High Voltage Switchgear (110kV and above)

• Application Scenarios: 110kV/220kV high voltage switchgear (such as GIS switchgear, gas insulated metal-enclosed switchgear) in substations and hub substations.
• Monitoring Focus:
  • GIS internal conductor rod joints (overheating in sealed environment easily causes SF₆ gas decomposition, leading to insulation failure);
  • Bushing and busbar connection parts (poor contact under high voltage easily produces local overheating, threatening insulation safety).
• Requirement Characteristics: Extremely high insulation requirements in high voltage environment (need to withstand 110kV and above voltage). The insulation characteristics of fluorescent fiber optic (fiber breakdown field strength >10kV/mm) can be directly installed close to high voltage components without additional insulation measures, and adapt to the closed, low-maintenance environment of GIS.

2. Application Scenarios Classified by Industry Sectors

1. Power System (Grid and Substations)

• Core Requirements: Ensure stable grid operation, avoid power outages caused by switchgear overheating (such as regional power outage caused by 10kV switchgear contact overheating at a substation in 2023).
• Typical Applications:
  • Urban substation 10kV outgoing switchgear (large load fluctuations, need real-time monitoring of load-temperature correlation);
  • Distribution switchgear in rural grid transformation (complex environment, strong adaptability of fluorescent fiber optic’s dust and moisture resistance).

2. Industrial Enterprises (Factories, Manufacturing)

• Core Requirements: Industrial production relies on continuous power supply, switchgear failure may cause production line shutdown (such as self-owned distribution rooms in automobile factories, chemical plants).
• Typical Applications:
  • Steel plant high voltage motor control cabinets (high load, strong vibration environment, fluorescent fiber optic vibration resistance and electromagnetic interference resistance characteristics are suitable);
  • Chemical plant explosion-proof switchgear (requires intrinsically safe monitoring, fiber optic has no electric spark risk, meets explosion-proof requirements).

3. Rail Transit (Subway, High-speed Rail)

• Core Requirements: Rail transit power supply system requires extremely high reliability (serious consequences of shutdown), switchgear mostly located in tunnels, vehicle depots and other narrow spaces.
• Typical Applications:
  • Subway traction substation 35kV switchgear (large traction load impact, contacts easily overheat);
  • High-speed rail line distribution station 10kV switchgear (outdoor or semi-outdoor environment, need to withstand high and low temperatures, rain and snow, fluorescent fiber optic has strong weather resistance).

4. Commercial and Civil Buildings (Office Buildings, Large Venues)

• Core Requirements: Ensure power supply for critical equipment such as elevators and air conditioning, avoid affecting user experience due to distribution failures.
• Typical Applications:
  • Super high-rise office building low voltage distribution cabinets (although low voltage, but dense load, busbar joints easily overheat);
  • Large shopping mall distribution room switchgear (closed environment, traditional infrared temperature measurement difficult to penetrate cabinet doors, fluorescent fiber optic can be built-in monitoring).

3. Application Scenarios in Special Environments

1. Strong Electromagnetic Interference Environment

Such as switchgear near transformers and reactors (strong electromagnetic fields around), traditional thermocouples and wireless sensors are easily interfered with causing data distortion, while fluorescent fiber optic transmits through optical signals, completely avoiding electromagnetic coupling problems.

2. Space-constrained or Closed Environment

Such as compact switchgear (such as MNS drawer cabinets), GIS fully enclosed switchgear, with dense internal components, infrared temperature measurement requires opening cabinet doors (safety risks exist), while fluorescent fiber optic probes can be embedded in narrow gaps (diameter only 1~2mm), achieving monitoring without cabinet disassembly.

3. High Humidity, Dusty Environment

Such as cement plants, underground mining distribution rooms (heavy dust), southern humid region distribution rooms, fluorescent fiber optic probes use IP65 and above protection packaging, dust-resistant, moisture-resistant, avoiding failure of traditional sensors due to moisture and dust accumulation.

4. Long-term Maintenance-free Scenarios

Such as unattended substations, remote photovoltaic/wind power booster stations, fluorescent fiber optic probes are passive devices (no battery power required), service life can reach more than 10 years, reducing the cost of on-site replacement by maintenance personnel.

4. Scenario Adaptability Comparison with Traditional Temperature Measurement Technologies

Scenario Characteristics	Limitations of Traditional Technologies (Infrared, Wireless)	Adaptability Advantages of Fluorescent Fiber Optic System
High Voltage, Strong Electromagnetic	High insulation risk, data easily interfered	Fiber optic insulation, anti-electromagnetic interference, directly installed close to high voltage components
Closed/Narrow Space	Infrared requires line of sight contact, wireless signal poor penetration	Fiber optic can be flexibly arranged, built-in probe without cabinet disassembly
High Humidity, Dusty	Sensors easily affected by moisture and dust, accuracy decline	Probe sealed design, resistant to harsh environment
Long-term Unattended	Wireless sensors need regular battery replacement, high maintenance cost	Passive probe, long service life, maintenance-free

Summary

The core application scenarios of switchgear temperature monitoring system based on fluorescent fiber optic temperature measurement cover medium and high voltage power systems, industrial production, rail transit, building distribution and other fields. Especially in scenarios with strong electromagnetic interference, high voltage, closed narrow spaces, harsh environments and requiring long-term maintenance-free operation, it demonstrates advantages that traditional technologies cannot replace. Its application essence is to achieve reliable temperature sensing, enabling switchgear “condition-based maintenance” to replace “regular power outage maintenance”, ultimately improving the safety and economy of power systems.

Fiber optic temperature sensor, Intelligent monitoring system, Distributed fiber optic manufacturer in China