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Knee Point Voltage Formula For 5P20. This maybe a silly question, i have mag.curve results for a multiple ratio ct (200/400/600/5)5p20 10va. Ct knee point voltage can be calculated using the formula;
Current transformer requirements for protection 1 from www.slideshare.net
Consider transformer voltage transformation ratio e s = 4.44 * flux * current * number of conductor. Vk= (va x alf)/in + (rct x alf x in) given the primary data input: When the core reaches maximum flux density, it is fully saturated and there are no more magnets remaining to change this causes direction.
If The Factor Of Safety Is Taken As Two, This Means That At Least Up To Two Times The Maximum.
The required knee point voltage is determined as vkpz. The system voltage, vs = 275kv the rated fault level, if = 40kv the ct ratio = 600/1 the va rating = 30va the class type = 5p20 If you know the cross sectional area of core and number of turns on ct secondary you can use standard transformer equation of v=4.44 *ag *bm *f * t where v is voltage, ag is gross area of core, bm is flux density, f is friquancy, and t.
The Formula For Knee Point Voltage Is:
Silicon (si) diode is 0.7 v. In some cases knee point voltage like = 5(rct)+90v ect. K = ct transformation ratio;
To Calculate The Ct Vk.
Germanium (ge) diode is 0.3 v. When the core reaches maximum flux density, it is fully saturated and there are no more magnets remaining to change this causes direction. As per iec, the knee point voltage of a current transformer is defined as the voltage at which 10 % increase in voltage of ct secondary results in 50 % increase in secondary current.
Vk = 20 ( (Rct+Burden)) = 20 ( (3+15 ) = 360V.
Apply 10% of knee point voltage (provided on name plate details) to the secondary circuit by using auto transformer. Therefore slope at knee point voltage will be, slope = increase in voltage / increase in current = 0.1/0.5 = 0.2. Rct = ct secondary winding resistance in ohms, rw = loop impedance of pilot wire between ct and the;
Vkpz = K X Issc (Rct + Rb)
Vk= (va x alf)/in + (rct x alf x in) given the primary data input: This exact voltage is known as the. Vkp = k * if/ctr * (rct + rl + rr) where, k = constant, conventionally taken as 2.0 vkp = the minimum knee point voltage if = maximum fault current at the location, in amperes ctr = ct ratio rct = ct secondary winding resistance, in ohms
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