Transformer Paper – Duct Spacing
- 100% sulphate wood pulp
- Made of transformer board
- High purity and mechanical strength
- Good compatibility with liquid dielectrics
- Low shrinkage and compressibility
- Insulation class A (105 °C) in accordance to VDE 0530 Part1
- Suitable for cooling ducts in oil-filled distribution transformers
|TW0305300||3 X 5.0mm Strips on 0.13 transformer paper|
*Rolls slit to required size
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Pressure Relief Devices
ISONOM ® NKN 13 0887
ISONOM® NKN 13 0887 consists of Polyimide film (e.ge. Kapton'), covered on both sides with calendered Nomex¹ type 416.
ISONOM® NKN 13 0887 is mainly used as a slot liner, slot closure and phase insulation in thermal high stresses electrical motors.
ISONOM® NKN 13 0887 is also used as interlayer insulation in transformers and other electrical machines and appliances.
ISONOM® NKN 13 0887 is combined flexible material of thermal rating class 180 – 200°C with good mechanical properties like high tensile strength and high tear resistance combined with high electrical strength.
ISONOM® NKN 13 0887 has smooth surface which allows a trouble free manufacturing of low voltage motors where coil inserting machines are used.
Formats Sheets Width app 920mm, length on request Rolls Width 920mm untrimmed Tapes From 10mm width upwards
Originally packed, ISONOM® NKN 13 0887 can be stored unlimited under normal conditions (RT, 50% r. h.)
RFA ΙΙ -R™
Rotor Flux Analyzer: a second generation advanced tool to find rotor winding shorted turns in turbine generators and high speed synchronous motors
- Instant analysis of rotor winding condition at a fixed operating load
- Where needed, ability to analyze tests at different loads for a more certain prediction of rotor winding condition.
- Able to perform a spot measurement, or automatically acquire results over days during normal generator load changes, without test operator intervention
- Works with conventional wedge-mounted flux probe, or the Iris stator tooth-mounted TF Probe™, which can often be retrofitted with the rotor in-place
Synchronous Generator And Motor Rotor Windings
- The rotor insulation must withstand severe electrical, mechanical, and environmental stresses. Insulation failures can result from many factors including:
- Mechanical wear, especially that caused by frequent load cycles
- Distortion, breakage and migration due to centrifugal mechanical loading and thermally induced expansion/ contraction cycles
- Overheating due to overloading/over excitation or inadequate or diminished cooling
- Local overheating at high resistance brazed joints and at shorted turns
- Contamination from ventilation or copper dusting resulting in surface tracking between turns or to ground
- Over-voltages induced from system events or from firing circuits in static exciters.
- An insulation failure can translate into electrical connections between turns, and eventually a catastrophic winding to ground fault.
A turn-to-turn short is the most frequent rotor insulation failure mechanism. Turn shorts can result in:
- Thermal imbalance of the rotor leading to mechanical vibrations
- Magnetic imbalance in the flux resulting in mechanical vibration of the rotor
- Increased rotor temperature and subsequent insulation degradation
- Overheating resulting in insulation failure and a ground fault with the potential for a second catastrophic ground fault
- Inability to reach the rated MVA rating for the machine
- Decreased generator power due to higher electrical losses
Flux monitoring via permanently mounted air gap flux probes is a proven technology in synchronous machines to determine if turn-to-turn shorts have occurred in the rotor winding. Flux measurement provides the most direct means of monitoring the condition of rotor windings on-line, yielding the information on the integrity of coils’ inter-turn insulation. This information is critical in planning maintenance, diagnosing abnormal vibrations, and verifying new and rewound rotor integrity.