Transformer trays | automatic drainage system 4.0

Transformer trays

Transformer trays of transformers Ua1, Ua2 and Ua3,
Dortmund substation, Germany.

Insulating liquid: mineral oil

Destination

Use of an automatic drainage system for transformer trays with 5 ppm as the tested measured value for the oil concentration in the discharged precipitation water (general construction approval or type approval (DiBt) required).

Validation phase

For a test period of 5-6 months, three SIPP™ Nodes 500 for fully automatic dewatering, logging and continuous level control were installed on three transformer trays.

• Pumping cycle: Continuous minimization of water levels depending on precipitation.
• Abort discharge: oil concentration ≥ 5 ppm
• Measurement accuracy: +/- 1 ppm
• Measuring range: 0-20 ppm
• Sampling frequency: Once per second

Status and process data can be retrieved from the SIPP™ Warehouse via the Internet or sent as real-time messages via e-mail or an API interface. Server location in Germany, SSL encryption and fixed IP addresses secure data transmission.

Result

The connectivity of the three SIPP™ Nodes 500 was Ø 99.627 %. A total of approx. 10 m³ of water per transformer was pumped out in an environmentally safe and documented manner – without the need for personnel on site.

Summary:

• No error messages or malfunctions
• Long filter life – saturation < 30 % (filter serves as protection of the measuring instrument)
• Long calibration intervals of the measuring cell – only 9 % consumed in 6 months
• Water level during the whole period below the predefined critical level
• No derivation without pump protocol takes place

The use of SIPP™ Nodes is approved throughout the Group as an automatic drainage device for transformer trays.

Connectivity

Process data