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Knee Point Voltage Calculator. Rcable =resistenc of cable =2rcable. Knee point voltage of current transformer:
Knee Point Voltage Calculation of CT from www.scribd.com
Calculating knee point voltage vkp vkp = {2 x ift (rct+rw)}/ k vkp = required ct knee point voltage ift = max transformer through fault in ampere rct =. The ct manufacturer asks for the following information before designing the ps class ct. Therefore, the burden of the ct must be calculated during designing of the protection system.
If You Are The User Of An Iron Core Ct, Then You Don't Try To Calculate The Knee Point Of The Curve.
If vknee point< manufacture voltage of current transformer. Rct= resistenc of current transformer. Thompson, and brad heilman, schweitzer engineering laboratories, inc.
Silicon (Si) Diode Is 0.7 V.
The sinusoidal voltage of rated frequency applied to the secondary terminals of current transformer, with other winding being open circuited, which when increased by 10% cause the exiting current to increase 50%. Ct knee point voltage calculation sheet. Vknee point = isecandary (rct+ rcable+ rburden) where.
The System Fault Current And The Burden Of The Ct Should Be Known For Calculating The Knee Point Voltage.
Measure secondary current by using leakage current tester. To calculate knee point voltage of current transformer by. After or beyond this voltage the linearity between primary and secondary circuit that is the desired property of current transformer does not work any more.
Note Down The Knee Point Voltage Of Ct ( As Per Datasheet Of The Ct).
Apply 10% of knee point voltage (provided on name plate details) to the secondary circuit by using auto transformer. If you are a design engineer and are designing an. Knee point voltage is nothing but a magnitude of the saturation limit of the current transformer.
Test Procedure For Knee Point Voltage Calculation Of Ct :
The knee point voltage of ct is very important parameter for the ct used for differential protection. Cable length= 800 m lead resistance = 8.71 ohms/km ( x 2.5 mm2 copper cable is used) therefore 2r l = 2x 800 x 8.71 = 6.968 2 1000 = 7.0ohms ct secondaryresistance, rcr = 15.00 at 3000/1 a. Therefore, the burden of the ct must be calculated during designing of the protection system.
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