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NEW METHOD TO OPTIMIZE NO-LOAD NOISE OF POWER TRANSFORMERS BASED ON CORE DESIGN & TRANSFORMER OPERATING CONDITIONS

Ahmed Gamil ; SGB Regensburg, Germany, R&D Head Assistance
Franz Schatzl ; SGB Regensburg, Germany, Head of Technical Dept.

Sažetak

This paper introduces a new algorithm to calculate and optimize no-load noise (sound pressure)
of power transformers, and to identify iron sheet parameters. The calculation consists of two steps: the 1st
step consists in calculating an initial sound pressure level (A-Evaluation) which has approx. 70 %
accuracy within a tolerance interval of ±2dB (A). The 2nd step consists in estimating the expected
deviation from the initial calculation to reach 90 % accuracy in the final results. This deviation could be
due to material handling, quality tolerance, core manufacturing, etc.
The optimization process consists of two parts: the 1st part takes place before choosing a certain
iron sheet for calculation to identify the sheet parameters required for computational accuracy (“Sheet
Optimization”). The 2nd part consists in considering a core design with an undesirable sound pressure
level in order to reduce it to an acceptable limit. This part takes into account the other limitations such as
no-load losses and transformer dimensions (“Design Optimization”).
For new iron sheets in the market, there is no measurement history to rely on. However, the
algorithm is also capable of identifying the sheet parameters for calculation based on the available
algorithm data base and the magnetostriction measurements of the iron sheet manufacturer.

Ključne riječi

Sheet parameters; Limitation Factor; Magnetostriction; Noise Factors; 3D Parameter Model

Hrčak ID:

199207

URI

https://hrcak.srce.hr/199207

Datum izdavanja:

15.8.2017.

Posjeta: 679 *