EPRO PR6423/10R-030-CN Speed sensor

EPRO PR6423/10R-030-CN Speed sensor

The purpose of the impulse voltage test is to confirm that the transformer insulation’s withstand the lightning overvoltages which may occur in service. The power transformers used in high voltage systems at any time may be affected by the atmospheric discharges. The magnitudes of the lightning over voltages always depend on the impulse current and the impulse impedance where the lightning impulse occurs. This value is several times of operating voltage. Impulse voltage is produced by a “ impulse voltage generator ” in the laboratory.

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Lightning impulse voltages 

are applied to the line terminals successively. The number and application method of the lightning impulse voltages are stated in the standards. The other line terminals and the neutral line terminal shall be grounded directly or through a small resistance (fig. 15.3 and 15.4). In three-phase transformers, unless it has been agrred on a particular tapping, impulse test are performed at he two extreme tappings and the principal tapping. Each phase tests are performed at min., max. and principal tapping.

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