EPRO PR6423/002-030-CN+CON021 Remote control card

EPRO PR6423/002-030-CN+CON021 Remote control card

Generally at the rated current the ratio of the current harmonics to the rated current is less than 1%. Therefore; this is not so important for the transformer operators, but this measurement can be required to have an idea about the value. The magnitude of harmonic component, depends on the core material, the degree of the excitation, the design of the core, the connections of the windings and the impedance of the supply circuit.The measurement of current and voltage harmonics is made during the measurement of no-load losses and no-load current (section 4). Circuit diagram of harmonics measurement is given in fig. 12.1.

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The supply voltage waveform in the test laboratory 

shall be exactly sinusoidal. The supply voltage form may differ from sinusoidal form due the deterioration’s in the no-load current. In order to overcome this event, the magnetic characteristics of the test generator and transformer stay in the linear region, by choosing the appropriate connection-groups. Since the measuring voltage and measuring current are taken through voltage and current transformers to the analyzer, the operation regions of the measuring transformers shall be linear not to produce additional harmonics. Measurements are made for each phase. Usually 3 rd, 5 th, 7 th and 9 th harmonics which are comparatively stronger, are measured.

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