5P20 Knee Point Formula

5P20 Knee Point Formula. Lead wire burden in va= i 2 * 2 d/ (cs x 57) where: This maybe a silly question, i have mag.curve results for a multiple ratio ct (200/400/600/5)5p20 10va.

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Vkp = required ct knee point voltage, ift = max transformer through fault in ampere; However, the actual output current (is) is subject to an error due to the magnetization. Irrespective of whether the current transformer is open circuited or connected to burden at its.

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In some cases knee point voltage like = 5(rct)+90v ect. It means the maximum permissible error will be 5% 20 = accuracy limit factor indicates that the ct will sense the current with the specified accuracy even with 20 times of its secondary current flows in the secondary.

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Why ct secondary should not be kept open? 1250/1 a, 5 va, cl.

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If we consider the magnetising curve v(io) of the ct, the knee point voltage vk is defined as the point on this curve from which a 10% increase in voltage causes a 50% increase in the magnetising current io. According to ansi/ieee the intersection of the excitation curve with a 45 0 tangent line is the knee point.

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Why ct secondary should not be kept open? Calculating knee point voltage vkp;

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According to ansi/ieee the intersection of the excitation curve with a 45 0 tangent line is the knee point. Is discussed later in this paper).

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According to manufacturer areva p441, the ct requirement required for knee point voltage can be calculated from the equation (4.7) (areva, 2001). To calculate the ct vk.

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11 kv, 1500 / 1 a, 5p20, 2.5 va. Calculating knee point voltage vkp;

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In the above diagram, ‘5p’ is the. Where ct is used for protection purpose.

Vk = 20 ( (Rct+Burden)) = 20 ( (3+15 ) = 360V.

In some cases knee point voltage like = 5(rct)+90v ect. 66 kv, 200 / 1 a, 5p20, 2.5 va lv side : What does it mean by 5p20?

1250/1 A, 5 Va, Cl.

For both of the above cts, rated burden (rb) = rated va / (in x in) = 2.5 / (1 x 1) Therefore slope at knee point voltage will be, slope = increase in voltage / increase in current = 0.1/0.5 = 0.2. To calculate the ct vk.

If We Consider The Magnetising Curve V(Io) Of The Ct, The Knee Point Voltage Vk Is Defined As The Point On This Curve From Which A 10% Increase In Voltage Causes A 50% Increase In The Magnetising Current Io.

The va burden of the lead wires can be calculated by following mathematical formula. Ansi knee is more conservative compared to iec curve. Calculate transformer through fault ift

Is Discussed Later In This Paper).

This maybe a silly question, i have mag.curve results for a multiple ratio ct (200/400/600/5)5p20 10va. Current i2 is a perfect image of the primary current i1 in the transformation ratio. K = ct transformation ratio;

Just Would Like To Thank All For The Help In The Past.

1250/1 a, 5 va, cl. I = secondary current in amps d = lead wire distance in meter. By the above observation we found the knee point voltage of current transformer.