Dina Maizana Maiz Ahmad, Ir.
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/39894
2024-03-29T15:08:14ZEffect of stack of transformer core lamination on losses and flux distribution in 3-phase distribution transformers 1000kVa
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/50157
Effect of stack of transformer core lamination on losses and flux distribution in 3-phase distribution transformers 1000kVa
Ismail, Daut; Dina Maziana, Maiz Ahmad; Shuhaimi, Zakaria; Soib, Taib
This paper describes the results of an investigation on the effect of different amount of layers per stack of core lamination in the three of 3-phase distribution transformers 1000kVA. The investigation involves the variation of power loss, building factor, total harmonic distortion of flux and flux leakages. The power loss and flux distribution have been measured using no load test in three types of model of setting of core built from the same size and type of M5 (CRGO) laminations. The power loss of the transformer core assembled with 1 layer per stack of lamination is 6.58% better than the power loss of the transformer core assembled with 2 layers per stack of lamination and is also 8.31% better than the power loss of the transformer core assembled with 3 layers per stack of lamination, at 1.5T, 50 Hz. The flux leakage at the corner joint in the core assembled with 1 layer per stack of lamination is the lowest among the three of the transformer cores, over the whole flux density range. Total harmonic distortion flux is the largest in the transformer core with 3 layers per stack of lamination and the smallest in the transformer core with 2 layers per stack of lamination. Using 1 layer per stack of lamination in transformer core is more efficient than using the other two the three lamination of the transformer core.
Link to publisher's homepage at http://jere.unimap.edu.my
2008-01-01T00:00:00ZA critical review-power quality concerns
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/50152
A critical review-power quality concerns
Anayet, Karem; Ismail, Daut; Indra, Nisja; Dina Maizana, Maiz Ahmad; Rajendran, S.
Power system quality concerns is the art and science of analyzing power system
performance within a facility to determine potential problem areas or to better understand
known problems in an electrical distribution system. This mainly explain the various types
of power disturbances such as for irritant disturbances, blinks, sags, dips, swells,
transients, impulse transients, DC offset, harmonics, notching, surges, voltage fluctuation,
flickering, spikes, phase loss, outages, interruptions, under/over voltages etc. It also
explains the impact of the disturbances for the power system operation. The emphasis has been given on data collection to understand power quality concerns. The primary sources of data collection based on technicians who spent most of their time near power system equipment. It also introduces terminology and various issues to “Power Quality”.
Link to publisher's homepage at http://jere.unimap.edu.my
2008-01-01T00:00:00ZEffect different limb of transformer core assemble on performance
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/34251
Effect different limb of transformer core assemble on performance
Dina Maizana, Maiz Ahmad, Ir.; Mohd Afif, Mohd Radzi; Nuriziani, Hussin
This paper described the performance of transformer affected by different limb assembling. The experiment that used to investigate core is no-load, short circuit and load test to find the core loss, copper loss, flux leakage at corner joint and limb and total harmonic distortion of the flux at flux density range from 0.2 T to 1.6 T, 50 Hz. From the result of this investigation shows the core loss of transformer assembled with 2 limbs is 18.45% and 32.21% better than the transformer assembled with 3 and 5 limbs respectively at a flux density of 1.6T, 50 Hz. To increase the numbers of core limb assemble will reduce the efficiency of transformer.
Link to publisher's homepage at http://www.ttp.net/
2014-01-01T00:00:00ZEffect of rubber material clamp on core loss of 3-phase 100 kVA transformer core
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/32485
Effect of rubber material clamp on core loss of 3-phase 100 kVA transformer core
Dina Maizana, Maiz Ahmad, Ir.
This study describes the result of an investigation on the effect of rubber material clamp of core lamination with stagger yoke on three 100 kVA three-phase distribution transformer. The investigation involves the variation of power loss, building factor and the total harmonic distortion of flux. The method that used in the measurement is a no load test. Loss at the core of the clamps of wood is lower than the core without clamps and using rubber materials clamp. The Total Harmonic Distortion (THD) of flux is larger in the core using wood clamp material and smaller in the core assembled without clamp, over the whole flux density range. Using wood material clamp of core lamination in transformer core is more efficient than using the other two types of transformer core lamination. In which the use of rubber in addition as clamp material will increase the losses in transformer core due to the surface area of core clamp is inhibit and not easily released to air in a short period.
Link to publisher's homepage at http://www.ansinet.com/
2013-01-01T00:00:00Z