Q₂Draw Sechematic diagram For A Y/1 three Phase Power transformer subjected to wothrough Fault. L-L Fault, show the types of protection used for this case!
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- Write in Briefly about circuit breaker, current transformer and voltage transformerIn the single-phase, three- winding, transformer, the primary current is equal to lo at the condition of ints there is no load on tertiary windings the current in secondary windings equal to zero the resistances (R1, R2, and R3) in transformer windings are equal the inductances (L1, L2, and L3) in transformer windings are equal.What is the influence of transformer connections in single-phase transformers connected for 3- phase operation
- 2.14 The resistances and leakage reactances of a 40-kVA 60-Hz 7.97-kV-V:240-V single-phase distribution transformer are R1 = 41.6 2 R2 = 37.2 m %3D X1, = 42.1 2 X1, = 39.8 m2 where subscript 1 denotes the 7.97-kV winding and subscript 2 denotes the 240-V winding. Each quantity is referred to its own side of the transformer. Draw the equivalent circuit referred to (i) the high- and (ii) the low-voltage sides. Label the impedances numerically. a. b. Consider the transformer to deliver its rated kVA to a load on the low-voltage side with 240 V across the load. (i) Find the high-side terminal voltage for a load power factor of 0.87 power factor lagging. (ii) Find the high-side terminal voltage for a load power factor of 0.87 power factor leading.Questions:- 1. What are the features of star and delta connected windings? 2. What will happen if transformers are connected in parallel without satisfying the necessary conditions? 3. Out of the conditions for successful parallel operation listed above, state which of the conditions must be strictly satisfied and which of the conditions permit deviation? 4. What do you mean by transformer connection Ydl and Dy11? 5. Draw the connection diagram for two parallel transformers with (A-A) connected ? 6. Why the following connections are not possible for parallel operation?1. For this question you are to sketch two transformers (T1 and T2) side by side connected in PARALLEL. Be sure to employ alphanumeric polarity markings for each transformer with the LV windings on the TOP and the HV windings on the BOTTOM. T1 should have ADDITIVE polarity and T2 should have SUBTRACTIVE polarity. Include a source bus voltage [REFERENCE] above the transformers and a single-phase load. Indicate the direction of all voltages with respect to the reference direction. Based on the preceding requirements, provide a complete SCHEMATIC diagram showing how the two transformers should be connected for proper PARALLEL operation.
- Q2: A generator supplies motor through a star-delta transformer. The generator is connected to the star side of transformer. A fault occurs between the motor terminals and the transformer. The symmetrical components of the rubtransient current in motor and transformer toward the fault as table below laz(per unit) j2.0 lao(per unit) j3.0 las (per unit) Motof toward the fault Transformer toward the -0.8-j2.6 0.8-j0.4 j1.0 fault Assume X-X,- X2 for both the motor and gencrator. Describe the type of fault. Find (a) the prefault current, in line a, (b) the subtransient fault current in per unit and (c) the subtransient current in each phase of the gencrator in per unit. Gén. MotorQ2\ Two generators G1 & G2 are rated 15 MVA, 11 kV and 10 MVA, 11 kV respectively. The generators are connected to a transformer as shown in the following figure. Find the sub- transient current in each generator when a three-phase fault occurs on the high voltage side of the transformer. A/Y 15 MVA, 11 kV, X"gl=j0.10 pu G2 15 MVA, 11/66 kV, Xr-j0.06 pu 10 MVA, 11 kV, X"g2-j0.10 puA9 The purpose of the short circuit test of the transformer is to measure the copper losses. (TRUE/FALSE)
- The _____________________ of transformers are neglected to draw the reactance diagram. a-Shunt branches b -Series conductance c-Series reactance d-Static LoadsFigure 5 shows the core of a Linear Variable Differential Transformer (LVDT). S, S2 CORE Figure 5 Explain what happens when the core is at its maximum left, null and maximum right positions.What happened to 3-phase delta configuration of transformer when any one of the phases is opened due to the fault. Also, explain a brief operation along with the appropriate phasor diagram. Draw the phasor diagram along with the connection for Dd6 and Ydi