Two single phase transformers of 1000 kVA and 500 kVA with equal voltage rating 11 kV/ 400V connected in parallel shares a common load. If the impedances of the transformer referred to secondary is 0.02 + j0.07 Ω and 0.05 + j0.175 Ω respectively, find the maximum UPF load can be connected to them without overloading

Two single phase transformers of 1000 kVA and 500 kVA with equal voltage rating 11 kV/ 400V connected in parallel shares a common load. If the impedances of the transformer referred to secondary is 0.02 + j0.07 Ω and 0.05 + j0.175 Ω respectively, find the maximum UPF load can be connected to them without overloading

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.43P: Three single-phase transformers, each rated 10MVA,66.4/12.5kV,60Hz, with an equivalent series...

See similar textbooks

Similar questions

With generator conyention, where the current leaves the positive terminal of the circuit element, if P is positive then positive real power is delivered. (a) False (b) True
An infinite bus, which is a constant voltage source, is connected to the primary of the three-winding transformer of Problem 3.53. A 7.5-MVA,13.2-kV synchronous motor with a sub transient reactance of 0.2 per unit is connected to the transformer secondary. A5-MW,2.3-kV three-phase resistive load is connected to the tertiary Choosing a base of 66 kV and 15 MVA in the primary, draw the impedance diagram of the system showing per-unit impedances. Neglect transformer exciting current, phase shifts, and all resistances except the resistive load.
(a) An ideal single-phase two-winding transformer with turns ratio at=N1/N2 is connected with a series impedance Z2 across winding 2. If one wants to replace Z2, with a series impedance Z1 across winding 1 and keep the terminal behavior of the two circuits to be identical, find Z1 in terms of Z2. (b) Would the above result be true if instead of a series impedance there is a shunt impedance? (c) Can one refer a ladder network on the secondary (2) side to the primary (1) side simply by multiplying every impedance byat2 ?
cotabato light and power company supplies two single phase transformers at san pablo area banked in open delta if each transformet is rated 75KVA capacity what is the maximum 3 phase load in kilowatts that the bank can carry without suffring oerload considdering that the load has laggingpower factor of 0.80
If the turn ratio of a step-down transformer is 10:1 and the series impedance (referred to the primary) of j50 ohm. If the no-load primary voltage is 230 kV (line-to-line), the secondary side is serving a Y-connected balance load of 1.5+ j0.25 ohms, the reactive power (per phase) absorbed by the load would be?
Determine the efficiency of three-phase 400 kVA, 11kV/ 380 V transformer at over-loadingcondition by 15% of its rated with unity power factor load. The copper and iron losses atfull load are 16 kW, 4 kW respectively.b) State one or more of the ways to reduce the losses that taken place in transformers.
A small industrial plant draws an average load of 122 A at 0.73 power factor lagging from thesecondary of its 2300/208 V, 60 kVA, star-delta transformer bank. Find: (iv) the rated transformer phase currents of the delta secondaries(v) percent of rated load on the transformers(vi) primary line and phase currents(vii) the kVA rating of each individual transformers
Which termination would result to a phase change of 180 degrees at the load if Zo = 100 ohm? a. 50 ohm b. short circuit c. 75 ohm d. all of these What is the purpose of impedance matching? a. maximum return loss b. maximum SWR c. maximum load power d. maximum reflection A short piece of transmission line that may be open or shorted and used for impedance matching purposes. a. converter b. decoder c. stub d. transformer
9. A 3-phase transformer rated at 1,000 kVA, 11/3.3 kV has its primary windings wye-connected and its secondary windings delta-connected. The actual resistances per phase of these windings are: r1 = 0.375 Ω, r2 = 0.095 Ω; and the leakage reactances per phase are: x1 = 9.5 Ω, x2 = 2 Ω. Calculate the voltage at the normal frequency which must be applied to primary terminals in order to obtain full-load current in the windings when the secondary terminals are short-circuited. Also, calculate the power input under these conditions.
there is a three-phase transformer that supplies 12 kW to a neighborhood supermarket, the same is in the standards and is considered a balanced three-phase load with inductive power factor of 0.8. If the supermarket at the supply input is star connected, fed with four conductors and operating at a phase-neutral voltage equal to 200 V. What is the line current with this load?
Two 7970-V:230-V single-phase transformers with impedance with respect to their secondaries of 1.5 + j3 and 2 + j4.5 ohms are connected in parallel to a 7900-V source. Their secondaries are supplying a common load of 30 + j40 ohms. What is the magnitude of the voltage across the load in volts? (2 decimal places)
For the single-phase power system below, find the transmission losses in Watts (assume that the transformers are ideal). Hint: Remember that loads can be represented by complex numbers in either rectangular or polar form.