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Power Transformers and its Factors
Power transformers are very important electrical devices involving less expenditure and more benefits. They are more useful for domestic consumption and industrial needs. Defective transformers cause damage to asset itself besides harming the surroundings. At times, loss of limbs to humans also is a possibility. Substitution will cost more and hence avoidable. So, testing & diagnosis of the device is more advisable and acceptable. OMICRON provides an exhaustive gamut of test sets for power transformers.
Conventional Electrical Power Transformers Testing:
Conventional tests will identify many critical problems. Mechanical changes lead to changed load losses & leakage resistance. It can cause altered short circuit impedance. OMICRON has developed testing solutions for all such defects.
Dissipation Factor, Power Factor & Capacitance Measurement:
Dissipation factor, power factor & capacitance measurement on capacitive bushings are of prime importance to identify defects in the potential steering electrodes before they cause insulation disruption. OMICRON provides innovative solutions for transformer testing.
Power Transformer & Moisture Measurement:
Moisture from the atmosphere enters transformers. This occurs during installations & repairs. Ageing of the oil-paper insulation also adds to the moisture content. By assessing the water content in insulation, transformer reliability & longevity can be ensured. OMICRON's patented method measures the water content in oil-paper insulations. For this purpose, the latest dielectric measurement technique is employed.
Water enters transformer from the atmosphere during installation & repair. The solid part of the insulation structures contains most part of the water. Moisture entering oil-paper insulation will prompt dangerous results.
Decreases the dielectric withstand strength
Accelerates cellulose ageing (the so-called de-polymerization)
Leads to the emission of gas bubbles at high temperatures causing unforeseen electrical breakdown
OMICRON provides innovative solutions to set right the defect.
Partial Discharge Measurement and Monitoring:
Whenever an insulation breakdown of high voltage equipment occurs it is preceded by partial discharge phenomenon. It leads to cost intensive outages & repairs. So, partial discharge can be conducted to confirm the strength & thoroughness of the high voltage equipment. Partial discharge phenomena are defined as localized dielectric breakdowns. Due to partial discharge, the insulation deteriorates gradually.
In power transformers, partial discharge can lead to corrosion on slid insulating material, decomposition & pollution of the insulating oil, so that the insulation properties of the oil cannot be guarantee anymore. Partial measuring of transformers is therefore highly imperative when their life cycle starts its motion and on instances of major repairs. Partial discharge measurement will be useful in determining the ageing conditions of transformers. Its remaining life term can be decided.
Due to the 3 PARD (3-Phase Amplitude Relation Diagram) evaluation methods, different Partial discharge sources inside a transformer can be separated. Partial discharge activity from noise or other indicators can also be separated. Customers all over the world have accepted it for using it even during noisy onsite conditions. The 3 CFRD (3-Center Frequency Relation Diagram) further activates and accelerates 3 PARD methods. It has exhibited very valuable outputs in laboratory & field tests. 3 PARD & 3 CFRD need synchronous multi-channel PD data acquisition. In order to bring synchronous multi-channel PD acquisition within nanoseconds, powerful hardware, in MPD 600 format, is necessary.
Frequency Response Analysis (FRA):
Frequency Response Analysis (FRA) or Sweep Frequency Response Analysis (SFRA) is a path breaking and non-conventional test method. It permits the detection of mechanical or electrical changes in a transformer. Winding deformations (axial or radial), displacements between windings, core movement and some other changes can be dealt with exactly & correctly.