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- Draw and explain the scheme illustrating the principle of a transformer voltage U2 regulation (OLTC).a) With neat diagram explain the principle of operation of Induction type energy meter. ? b) Discuss the potential transformer with neat schematic diagram. ?Make a conclusion regarding about the topic effect of frequency on transformer rating .
- Which of the following Surge Diverter use non-linear resistances in its fabrication? Rod - Gape SD. Lightning Arrester SD. Expulsion Tube SD. O All of the above.From the topic of insulation resistance testing of a transformer,(Layout of the Analog Insulation – Continuity Tester) the insulation of the equipment tested is healthy?JustifyFrom the topic of insulation resistance testing of a transformer,(Layout of the Analog Insulation – Continuity Tester) with the lapse of time, what is the change in insulation resistance expected? Why?
- Consider a 5A ammeter is connected to the secondary side of a 100/5A current transformer (CT) in order to measure the current of the circuit. Safety considerations require that the CT has to be short circuited (or the primary circuit switched off) during a replacement of the ammeter. Explain why this is needed.Fill in the blanks with appropriate words: To remove zero sequence current in power system, one sides of the transformer is connected in ……………………….A 50 kV surge arrester will be installed on an effectively grounded 15 MVA, 33/11 kV transformer at a 33 kV three-phase system. The basic insulation level of the transformer is 3X0 kV. The arrester ratings and its protective voltage level are shown in Table 1. For 33 kV nominal voltage, the system's maximum voltage is 36 kV. Verify whether this surge arrester is suitable for the protection of the transformer or not (where X is 8). Jadual 1/ Table 1 Penangkap kilat/ Arrester # 1 #2 # 3 # 4 Kadar penangkap kilat/ Arrester rating (kVrms) 75 60 50 36 Voltan limpahan denyut maksimum / Maximum impulse flashover voltage (kV peak) 270 216 180 130 Voltan lebihan hadapan gelombang maksimum / Maximum wavefront flashover voltage (kV peak) 310 250 207 150
- Q1. Describe the following related to Current Transformer (CT): (i) Draw the equivalent circuit diagram of CT and develop the corresponding phasor diagram. Draw the transient response of CT and describe the transient errors in a CT. [5] [5] (ii)a) With the aid of a well-labeled diagram, describe a step by step approach of conducting a continuity test on a transformer.5) A short circuit test on 15kVa, 2400/240V, 60Hz transformer yields the following results: 6.25A, 132V and 215W. (A) determine the equivalent resistance referred to the high side in ohms, (b) determine the equivalent reactance referred to the high side in ohms,(c) determine the equivalent impedance referred to the high side in ohms, (d) determine the percent impedance of the transformer. Subject Electrical Apparatus and Devices