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access icon free Development of multi-parameter online monitoring equipment for EHV transformer bushing

© The Institution of Engineering and Technology
Received 02/06/2019, Accepted 29/10/2019, Revised 30/09/2019, Published 31/10/2019

To diagnose the running state of bushing and avoid serious power grid accidents, online multi-parameter monitoring equipment for dissolved hydrogen, oil pressure and temperature in bushing oil was developed. The equipment includes three units: signal acquisition, control cabinet and data analysis. A new hydrogen sensor without oil–gas separation membrane and based on palladium alloy film technology was developed. A three-in-one sensor for hydrogen, oil temperature and pressure monitoring has been developed, which has the advantages of miniaturisation, lightweight and easy installation. Test results show the hydrogen measurement range of the sensor is 0–5000 ppm, and the accuracy can reach 10% or 15 ppm (with larger values). The pressure measurement range is 0–1.0 MPa, the resolution is 0.1 kPa, and the accuracy can reach 0.25 grade. The temperature measurement range is −40 to 105°C, and the accuracy is ±1°C. The measurement performance of the device fully meets the requirement of online monitoring of transformer bushing. The equipment has been put into operation in a 330 kV substation, which can monitor the bushing status online and help eliminate the early latent fault of bushing in the weak budding state.

Inspec keywords: palladium alloys; silicon compounds; temperature measurement; bushings; chemical sensors; fault diagnosis; power transformer insulation; pressure sensors; temperature sensors; pressure measurement; transformer oil; chemical variables measurement; thin film sensors

Other keywords: voltage 330.0 kV; hydrogen measurement range; data analysis; oil pressure; transformer bushing faults; temperature -40.0 degC to 105.0 degC; pressure monitoring; pressure 0.0 MPa to 1.0 MPa; palladium alloy film technology; Si3N4; hydrogen sensor; signal acquisition; oil temperature; EHV transformer bushing; pressure 0.1 kPa; oil-less equipment; bushing oil; temperature measurement range; dissolved hydrogen; pressure measurement range; protective film; control cabinet; oil–gas separation membrane; online multiparameter monitoring equipment; power grid accidents; low power consumption

Subjects: Chemical sensors; Pressure and vacuum measurement; Chemical sensors; Sensing and detecting devices; Chemical variables measurement; Organic insulation; Thermometry; Transformers and reactors; Pressure measurement; Thermal variables measurement

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