4) The three bus bar conductore in an outdoor substation are supforted by units of post type insulatore. Each unit consist of a stack of is pin type insulators fixed one on the tof if the other. The voltage across the lowest insulator is 13.1 kV and that across the next unit is Ukv. Find the bus-bar voltage of the station.
Added by Aaron M.
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1 kV. Secondly, we know that the voltage across the next unit is U kV. The total voltage across both units would be the sum of the voltage across each unit. Show more…
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Example 10.2: A 3-phase feeder having a resistance of 3 Ω and a reactance of 10 Ω supplies a load of 2 MW at 0.85 power factor lag. The receiving-end voltage is maintained at 11 kV by means of a static condenser drawing 2.1 MVAr from the line. Calculate: 1. The sending-end voltage 2. Power factor 3. Voltage regulation 4. The feeder efficiency.
Adi S.
(a) The one line diagram of a three phase power system is shown in Figure 1. Impedances are marked in per-unit on a 100-MVA, 400-kV base. The load at bus 2 is S2= 15.93 MW-j33.4 Mvar, and at bus 3 is S3 = 77 MW+j14 Mvar. It is required to hold the voltage at bus 3 at 400∠0
3. The inner conductor of a concentric cable has a diameter of 3 cm with insulation of diameter 8.5 cm. The cable is insulated with two materials having relative permittivities of 5 and 3 with corresponding safe working stresses of 38 kV/cm and 26 kV/cm. Calculate the radial thickness of insulating layers and the safe working voltage of the cable. [2.15 cm, 0.6 cm, 46.1 kV (r.m.s.)] 4. A single-core lead covered cable is to be designed for 66 kV to earth. Its conductor diameter is 2 cm and its three insulating materials have permittivities of 5, 4 and 3 respectively with the corresponding maximum safe working stress of 38 kV/cm (r.m.s.), 26 kV/cm (r.m.s.) and 20 kV/cm (r.m.s.) respectively. Find the minimum diameter of lead sheath. [8.3 cm] 5. A single-core 66 kV cable has a conductor diameter of 2 cm and a sheath of inside diameter 5.3 cm. The cable has an inner layer of 1 cm thick of rubber of dielectric constant 4.5 and the rest impregnated paper of dielectric constant 3.6. Find the maximum stress in the rubber and in the paper. [63 kV/cm, 39.5 kV/cm] 6. A single-core cable working on 66 kV on 3-phase system has a conductor diameter of 2 cm and a sheath of inside diameter 5.3 cm. If two intersheaths are used, find the best positions, maximum stress and the voltage on the intersheaths. [d1= 2.77 cm; d2= 3.84 cm ; 38.7 kV/cm ; V1= 41.1 kV, V2= 23.9 kV]
Kratika B.
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