Technical Guide for Fiber Optic Temperature Measurement Device in Switchgear-INNO

The optical fiber temperature measurement device for switchgear is an advanced equipment used to monitor the internal temperature of power switchgear. It mainly consists of fluorescent optical fiber sensors, optical fibers, and monitoring systems. Its working principle is based on the fluorescent materials in the sensors, which generate fluorescence when excited by light. By measuring the decay time of the fluorescence余晖, the ambient temperature can be accurately determined.

Installation Steps

1. Pre-installation Preparation

Identify monitoring points: Mark critical components such as static contacts, busbar joints, and cable terminals inside the switchgear.
Verify equipment specifications: Ensure the temperature range and probe size of the optical fiber sensors (e.g., fluorescent or fiber Bragg grating type) match the switchgear’s structure.
Prepare tools: Include optical fiber strippers, high-temperature-resistant silicone, insulation tape, and cable ties.

2. Sensor Installation

Clean the probe and measurement surface with anhydrous alcohol to ensure good thermal conductivity.
Secure the sensor:
- For flat surfaces, use high-temperature tape or mechanical clamps to ensure tight contact (gap ≤0.1mm).
- For curved or confined spaces, use special molds or silicone glue (layer thickness ≤0.5mm).
Route the optical fiber:
- Avoid high-voltage conductors and sharp edges. Use protective sleeves when passing through metal partitions.
- Maintain a bending radius ≥30mm to prevent signal attenuation.
- Secure the fiber with cable ties every 30cm to prevent vibration.

3. Host and Interface Connection

Install the monitoring host in a well-ventilated area away from strong magnetic fields (ambient temperature ≤50°C).
Connect the optical fiber:
- Strip the fiber end (length ~5cm), cleave it flat, and insert into FC/SC connectors.
- Ensure dust caps are used and connectors are securely fastened.
Electrical connections:
- Power supply: Connect to AC220V or DC24V according to specifications.
- Communication: Connect RS485 or Ethernet cables to the monitoring system, ensuring proper grounding of shielding layers.

4. Commissioning and Acceptance

Optical path test: Check signal strength (≥-25dBm) using the host’s built-in function. Clean connectors if signals are weak.
Temperature calibration: Compare readings with a standard thermometer. Adjust if偏差 exceeds ±1°C.
Alarm test: Set temperature thresholds (e.g., warning at 80°C, alarm at 100°C). Verify audible/visual alarms and data upload using a heat gun.
Continuous operation test: Monitor for 24 hours to ensure stable readings without drift.