The ESI TVD incorporates all the necessary features to allow a transformer to remain in service while moisture from its insulation is effectively removed. The system is safe with several alarm features that shut the system off isolating if from the transformer, in the event of ant abnormal signal. The ESI TVD provides a non intrusive, cost effective and convenient method of maintaining transformers in a dry condition. The TVD uses vacuum dehydration to remove moisture and gases from the oil allowing the economical removal of large volumes of water.
Features
The ESI TVD oil processing system is designed to allow a transformer under load to dry itself out. The filtering system removes dissolved water from oil to <5ppm, and includes 0.3 micron nominal particulate removal capabilities. The process removes dissolved gas in oil but does not remove oil oxidation inhibitors.
The system is complete with all components necessary to monitor the mechanical and electrical operating conditions of the unit. The unit has a flow rate of approximately 500 litres/hr. The oil is filtered and heated via a positive displacement gear pump. The warm oil is then sprayed into the vertical degasser chamber under very high vacuum. The clean dry oil is then returned via a centrifugal pump, to the transformer. A number of level switches and integrated controls prevent oil discharge from the vacuum pump. Over pressure and leakage protection of the plant and hoses ensure the transformer is isolated from the filter unto should any malfunction occur. An alarm light and relay is provided for indication purposes.
BENEFITS:
- The transformer remains in service during process
- Reduced transformer dryout costs
- Removes combustible gases and oxygen
- Improves oil dielectric values
- Improves transformer power factor
- operate continuously unattended
- Extends oil service life
- Extends transformer service life
