Epoxylite ® MD 0234
Two component, grey, filled Polyurethane resin designed for continuous use at Class B temperatures with short term exposure to Class F temperatures also being tolerated.
Epoxylite ® MD 0234 has a high thermal conductivity and cures to a tough semi-flexible product.
Epoxylite ® MD 0234 has been specifically designed as a cable potting resin but is suitable for general purpose encapsulating, where electrical and electronic components require sealing and potting with a thermally conductive material
Epoxylite ® MD 0234 should be processed at room temperature.
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VOTAFILM ® 2645
VOTAFILM ® 2646 is a special thermal PET-film, coated with a thin silicone coating on both sides. VOTAFILM® 2646 has high tensile strength and edge tear resistance and shows excellent separation properties, is easy removable, without residues. VOTAFILM® 2646 has a low shrinkage rate at up to 180 °C.
VOTAFILM ® 2645 is used as release film in the curing process of thermosetting resins. Due to the good thermal resistance and separation properties VOTAFILM ® 2645 is suitable up to 180 °C in a very economical manner. After pressing the shrinking properties give a uniform radius on the corners.
Format Rolls maximum width 1050 mm Tape 40 mm width
VOTAFILM ® 2645 can be stored 2 years under normal conditions (20 °C; 50% humidity)
Curing condition: 3 hours at 5 °C or 6 hours at 140 °C
Dobeckan ® ST NV 075-4475
Electrical Insulation System
Single component, thermal class 200
Dobeckan ® ST NV 075-4475 is a single component impregnating resin without solvents and reactive thinners like styrene and vinyltoluene, that combines rapid cure with excellent tank stability.
Dobeckan ® ST NV 075-4475 has been designed to give very high degree of resilience to absorb thermal and mechanical shocks, which make it an ideal impregnant for Class 'H' systems ( when used in conjunction with other suitable conductor and insulation products).
Dobeckan ® ST NV 075-4475 is classified as a non hazardous material, enabling simple transport, storage and handling.
The components fulfil the directives 2011/65/EU, 2003/11/EC and 2006/121/EC. The raw materials of the components are pre-registered according to the directive No. 1907/2006/EC (REACH). The system does not contain by recipe substances listed in Article 57/Anex XIV 1907/2006/EC from 9th October 2008 (SVHC).
Areas of application
Typical applications for Dobeckan ® ST NV 075-4475 are:
- Transformers of different sizes.
Periodic Rotor Flux Analyzer: an advanced tool to find rotor winding shorted turns in large salient pole motors and hydro generators during service
On-Line Magnetic Flux Monitoring
The condition of the rotor pole insulation is difficult to assess during minor or major generator maintenance outages. Access to the poles is severely restricted without some disassembly and removal of components. Off-line tests like the pole-drop test for detection of shorted turns can also be frustratingly ineffective due to the frequently intermittent nature of the faults at speed and at standstill. These off-line tests are also time-consuming, tying up resources and personnel that during an outage could be better utilized elsewhere. Consequently, on-line measurements are preferred to off-line tests and inspections. Through research funded by EPRI and the New York Power Authority, novel new algorithms for analyzing flux signatures on salient pole motors and generators have been developed to detect rotor pole shorted turns, and incorporated into the RFAII-S instrument.
The RFAII-S instrument employs algorithms that revolutionize the analysis of the flux data on salient pole rotors by providing diagnosis of the rotor winding condition regardless of generator load changes. This technology, when connected to the TFProbeTM (total flux probe), can accurately detect and locate the presence (or absence) of turn shorts.
Once the RFAII-S is configured, its high-speed acquisition, high resolution capability, and novel analysis algorithms provide a definitive answer or a cumulative profile of the condition of the rotor insulation. This information is invaluable in helping to plan an outage, or in evaluating the effectiveness of rotor pole refurbishment.