Logistics of high value power transformers is a challenging and time consuming task due to the large size and the remote location of installation of these transformers. Power transformers are usually very reliable, but when faults occur, the transformer can be affected catastrophically. During transportation if a transformer experiences a mechanical shock more than the required “g” levels the windings may displace and/or distort. In the process of winding movement, the insulation between the turns can be abraded, causing a short circuit and damage to the windings. Mechanical vibrations may cause the windings to loose their clamping pressure, due to which they may slacken and subsequently become unable to withstand mechanical forces exerted during faults. This may reduce the overall life of the winding and lead to early rewinding.

MIMTIS our M2M platform provides the most economical and reliable system to remotely monitor transformers during their transportation, the system is used to monitor the following parameters:

• Transformer location in real time
• Mechanical shock events
• Nitrogen pressure, humidity and temperature monitoring in gas filled transformers
• Monitoring of Oil level in oil filled transformers

The system architecture consists of the following integrated to a Remote Terminal Unit (RTU) on the transformer:

• Sensors: To measure oil level or nitrogen pressure, temperature, humidity
• Shock Recorder: To measure shock and vibration data
• GPS receiver: For geographical location monitoring

The data from the RTU is transmitted over GPRS/Satellite to the central MIMTIS server. The users can access the data over web or LAN. The system also allows the following analysis to be performed on the data:

• Dew point calculation of the nitrogen gas
• FFT (Fast Fourier Transform)
• PSD (Power Spectral Density) Spectrum
• EFFDR (Effective Free Fall Drop Range)

The system benefits are:

• Monitor location of transformers during logistics.
• Alarms are raised when parameters like nitrogen pressure, oil level, shock cross their threshold.
• In case of severe impacts the data can be analyzed for potential damage, this helps in contingency planning at installation site.
• The data logged may be used to support insurance claims if they arise.
• You have more satisfied customers.