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Development and Experimental Research of VFTO Measuring Sensor
Zihan Teng1, Jun Zhao1, Qi Wang1
1State Key Laboratory of Power Grid Environmental Protection, High Voltage Department of China Electric Power Research, Wuhan 430072, China.
Sensors (Basel, Switzerland)
|January 8, 2023
Summary
A new sensor accurately measures very fast transient overvoltages (VFTO) in gas-insulated switchgear (GIS). This improved measurement supports better insulation design for high-voltage electrical equipment.
Area of Science:
- Electrical Engineering
- Power Systems Engineering
- Electromagnetics
Background:
- Very fast transient overvoltages (VFTO) are significant electromagnetic disturbances in gas-insulated switchgear (GIS).
- Accurate VFTO amplitude measurement is crucial for the insulation design of primary electric power equipment in GIS substations.
Purpose of the Study:
- To develop and validate a new VFTO measuring sensor with enhanced performance.
- To improve the accuracy of VFTO amplitude measurements for better insulation design.
Main Methods:
- Development of a novel VFTO measuring sensor.
- Performance validation through hundreds of disconnector operations in a 220 kV GIS test circuit.
Main Results:
- The new sensor's low cut-off frequency was expanded to 0.01 mHz, a 50% improvement.
- Measurement accuracy for VFTO micro-pulse amplitude increased by approximately 80%.
- The sensor effectively measures trapped charge voltage, power frequency voltage, and high-frequency transient voltage within VFTO waveforms.
Conclusions:
- The new VFTO measuring sensor meets the measurement requirements for various voltage types in VFTO waveforms.
- It provides more accurate data for the insulation design of primary power equipment in extra-high voltage (EHV) and ultra-high voltage (UHV) GIS substations.
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