Class Px Ct Knee Point !!

ct specs part 4 class px diff protection seshveda.

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30 06 2020 how do we specify class px ct knee point voltage ek the equation for specifying the knee point voltage is as given below ek k dc 2 isc n rct r l 5 where ek knee point voltage v.

ct specs part 4 class px diff protection seshveda.

special accuracy class class x is a class defined by british standard bs 3938 it must also be defined in the future standard iec 60044 1 under the name of class px this class specifies the minimum value of the knee point voltage vk of the ct it also imposes a maximum value of rct ct secondary winding resistance sometimes it specifies the maximum value of the magnetising current io at knee point voltage.

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30 06 2020 px ct knee point induced voltage corresponds to bm of 1 4 t the above design factors for flux density are interesting from an accuracy point of view a class px ct is equivalent to say a class 5p ct provided it is operated at 1 4 t instead of the designed value of 1 6 t.

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15 07 2021 accuracy based on knee point voltage and rct for class x bs and class px and pr iec current transformer for protection relays the accuray is not based on burden and class but on minimum knee point voltage with corresponding maximum magnetising current secondary winding resistance rct 75 c load.

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17 05 2019 class 5p protection current transformers may be adequate for some balanced systems however more commonly the designer will specify a special class px current transformer ct giving the following information a turns ratio b knee point voltage vkp c maximum exciting current al vkp d ct secondary resistance previous inductive.

knee point voltage of current transformer ps class.

the latest iec 61869 calls it class px this is special class protection ct which has defined saturation characteristic and knee point recommended for use especially for high impedance differential protection.

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24 02 2012 so for choosing ct for differential protection of transformer one should consider current transformer ps class rather its convectional protection class ps stands for protection special which is defined by knee point voltage of current transformer v k and excitation current i e at v k 2 why ct secondary should not be kept open.

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13 07 2019 details of knee point voltage every protection class ct name plate contains details of knee point voltage as shown in below figure the name plate is for 3 core ct with middle taps for this ct the knee point voltage for ps class core is v k 120v for 3s1 3s3 winding and v k 60v for 3s1 3s2 winding.
class px ct knee point

class px ct knee point

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