Transformer trough | automatic drainage system 4.0
Customer Case
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
SIPP Node, Serial no. |
Connectivity |
Status OK |
Warning > 12 hrs. Error not fixed |
Warning > 72 hrs. Error not fixed |
G4S-15119 | 99,632 % | 100 % | 0 % | 0 % |
G4S-15114 | 99,639 % | 100 % | 0 % | 0 % |
G4S-15115 | 99,609 % | 100 % | 0 % | 0 % |
Process data
SIPP Node, Serial no. |
Quantity the protocols |
Volume Derived Water |
Remaining Filter capacity |
Water level below specified maximum limit |
G4S-15119 | 9 | 14.1 m³ | 72 % | 100 % |
G4S-15114 | 6 | 9.4 m³ | 77 % | 100 % |
G4S-15115 | 8 | 13.7 m³ | 73 % | 100 % |