EPRO PR6424/003-030+CON021 front sensor

EPRO PR6424/003-030+CON021 front sensor

Sometimes in the LV windings of the higher rated transformers, it might not be possible to reach half time-value on tail as it is defined in the standards. In such cases, suitable resistances may be connected between the windings which are not under the test and the ground. The resistance’s must be so selected, according to IEC 60076-3, that the voltage of these terminals of the windings against the ground must not be greater than the 75 % of the test voltages of the winding terminals and the value of the resistance must be maximum 500 Ω

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One and three phase transformer impulse test 

The voltage dividers used for measuring of impulse voltages generally are made of three types. 

1- Ohmic voltage divider 

2- Capacitive voltage divider 

3- Mixed (ohmic capacitive) voltage divider Although the types are changing according to the aim and place of using the most widely used voltage divider is R damped capacitive voltage divider.

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