Transformers.
Weather influences and constant load changes of transformers cause temperature fluctuations and thus pressure equalization with the environment.
The humid ambient air sucked in during cooling leads to hydrolysis of the cellulose paper in the transformer and thus to a reduction of its degree of polymerization. GIEBEL dehumidifiers protect the transformer by effectively drying and filtering the humid supply air.
In order to prevent damage caused by condensation, the use of a dehumidifier is an indispensable measure. The incoming air is dried and a strong reduction of the water content and the dew point is achieved. In addition to a mechanical valve system and an air filter element, these silica gel dryers take advantage of the regenerative capacity of the desiccant used.
Damage caused by water
- Defective seals – Loss of oil due to leaks
- Winding damage
- Mechanical damage to the boiler/chassis
- Rusty / silted active part
- Aged, contaminated insulating oil
How adsorbers work on transformers
The following graphics show in 4 steps, what happens inside a transformer without and with an adsorber when the ambient air is enricht with moisture. Just move the handle over the pictures to see the differences.
Left: Transformer without an adsorber. Ambient air enriched with moisture.
Right: Transformer useing an adsorber with desiccant. Ambient air enriched with moisture.
Left: Transformer cools down, the oil level drops and pressure is compensated by incoming moist air.
Right: Transformer cools down, the oil level drops and pressure is compensated by incoming air. The adsorber seperates moisture up to 2% rH (10% rH on average).
Left: Transformer heats up, the oil level is rising and pressure is equalized by outflowing moist air.
Right: Transformer heats up, the oil level is rising and pressure is equalized by outgoing dry air.
Left: When the ambient air cooles down below drew point, it emerges condensation in the interior. Droplets form and water flows into the insulating oil.
Right: When the ambient air cooles down below drew point, ther is no condensation in the interior. No droplets form and no water flows into the insulating oil.
Humidity and dew point
Absolute Humidity
Content of water vapor
Relative Humidity
Percentage to maximum humidity
Example
Temperature = 20°C
Air humidity = 80% rF
Water 13.8g/m³
Dew point 16,4°C
Permissible temperature range = 3,6°C
Find the right size
Adsorber for drying the supply air
Please click on the power / oil volume below
VV-RV 3M
Installation: Standing
Valves: Yes
Refillable: Yes
Sealing: FKM
Use according to ATEX 2014: No
Use indoor / below deck: Yes
Use outdoor / on land: Yes
Use offshore / on deck: No
TB-RV 3M
Available with the following connections: DIN 42562, DIN 42567 A, DIN 42567 B, DIN 42567 C (G 1″, G 3/4″, G 1/2″)
Installation: Hanging
Valves: Yes
Refillable: Yes
Sealing: FKM
Use according to ATEX 2014: No
Use indoor / below deck: Yes
Use outdoor / on land: Yes
Use offshore / on deck: No
TM-RV 3M
Available with the following connections: DIN 42562, DIN 42567 C (G 1″)
Installation: Hanging
Valves: Yes
Refillable: Yes
Sealing: FKM
Use according to ATEX 2014: Yes
Use indoor / below deck: Yes
Use outdoor / on land: Yes
Use offshore / on deck: Yes
VV-RV 3L
Installation: Standing
Valves: Yes
Refillable: Yes
Sealing: FKM
Use according to ATEX 2014: No
Use indoor / below deck: Yes
Use outdoor / on land: Yes
Use offshore / on deck: No
TB-RV 3L
Available with the following connections: DIN 42562, DIN 42567 A, DIN 42567 B, DIN 42567 C (G 1″, G 3/4″, G 1/2″)
Installation: Hanging
Valves: Yes
Refillable: Yes
Sealing: FKM
Use according to ATEX 2014: No
Use indoor / below deck: Yes
Use outdoor / on land: Yes
Use offshore / on deck: No
TM-RV 3L
Available with the following connections: DIN 42562, DIN 42567 C (G 1″)
Installation: Hanging
Valves: Yes
Refillable: Yes
Sealing: FKM
Use according to ATEX 2014: Yes
Use indoor / below deck: Yes
Use outdoor / on land: Yes
Use offshore / on deck: Yes
TB-RV 5M
Available with the following connections: DIN 42562, DIN 42567 A, DIN 42567 B, DIN 42567 C (G 1″, G 3/4″, G 1/2″)
Installation: Hanging
Valves: Yes
Refillable: Yes
Sealing: FKM
Use according to ATEX 2014: No
Use indoor / below deck: Yes
Use outdoor / on land: Yes
Use offshore / on deck: No
TM-RV 5M
Available with the following connections: DIN 42562
Installation: Hanging
Valves: Yes
Refillable: Yes
Sealing: FKM
Use according to ATEX 2014: Yes
Use indoor / below deck: Yes
Use outdoor / on land: Yes
Use offshore / on deck: Yes
TB-RV 5L
Available with the following connections: DIN 42562, DIN 42567 C (G 1″, G 3/4″, G 1/2″)
Installation: Hanging
Valves: Yes
Refillable: Yes
Sealing: FKM
Use according to ATEX 2014: No
Use indoor / below deck: Yes
Use outdoor / on land: Yes
Use offshore / on deck: No
TM-RV 5L
Available with the following connections: DIN 42562
Installation: Hanging
Valves: Yes
Refillable: Yes
Sealing: FKM
Use according to ATEX 2014: Yes
Use indoor / below deck: Yes
Use outdoor / on land: Yes
Use offshore / on deck: Yes
TB-RV 5XL
Available with the following connections: DIN 42562
Installation: Hanging
Valves: Yes
Refillable: Yes
Sealing: FKM
Use according to ATEX 2014: No
Use indoor / below deck: Yes
Use outdoor / on land: Yes
Use offshore / on deck: No
TM-RV 5XL
Available with the following connections: DIN 42562
Installation: Hanging
Valves: Yes
Refillable: Yes
Sealing: FKM
Use according to ATEX 2014: Yes
Use indoor / below deck: Yes
Use outdoor / on land: Yes
Use offshore / on deck: Yes
Videos
References – Our Adsorbers in action
Transformer boiler / tap changer
Oil: insulation oil
Power: 20 MVA
Oil volume: 10 tons
Adsorbers: TB-RV 5M (for transformer vessel) & TB-RV 3M (for tap changer)
Rectifier
Oil: insulation oil
Power: 40 MVA
Oil volume: 20 tons
Adsorber: TB-RV 5L
Oil transformer
Oil: insulation oil
Power: 10 MVA
Oil volume: 5 tons
Adsorber: VV-RV 3L
Oil transformer offshore
Oil: insulation oil
Power: 30 MVA
Oil volume: 15 tons
Adsorber: VM-RV 5M
Power transformer
Oil: insulation oil
Power: 20 MVA
Oil volume: 10 tons
Adsorber: TB-RV 5M
Converter transformers
Oil: insulation oil
Power: 60 MVA
Oil volume: 30 tons
Adsorber: TB-RV 5L (for transformer vessel) & TB-RV 3M (for tap changer)
