A6 mm PVC sheathed insulated copper 82 m length cable (k-115) is short-circuited when connected to a 231 V supply U the impedance of the short-circuit path is 0.150 the maximum permissible disconnection time required to avoid dangerously raisinig the conductor temperature is about:
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- Single core cable design for 25 kV. The radius of conductor is 0.5 cm. The insulation material consists of two layers. The thickness of each layer is 2 cm. The voltage of first and second layers are 20 kV, 5 kV respectively. The maximum Electric stress of the cable isThe three bus-bar conductors in an outdoor sub-station are supplied by units of post insulators. Each unit consists of a stack of 3-pin insulators fixed one on the top of the other. The voltage across the lowest insulator is 8-45 kV and that across the next is 7-25 kV. Find the bus-bar voltage of the station.A 30 kV single core cable has a conductor dimeter of 2 cm and a sheath of inside diameter 6 cm. Find the maximum (peak value) and minimum stress (peak value) in the insulation.
- Single core cable design for 25 kV. The radius of conductor is 0.5 cm. The insulation material consists of two layers. The thickness of each layer is 2 cm. The voltage of first and second layers are 20 kV, 5 kV respectively. The minimum Electric stress of the cable isA 33 kV single core cable has a conductor diameter of 1 cm and a sheath of inside diameter 4 cm. Find the maximum and minimum stress in the insulation.A set of conductors is used to supply residential unit with a total load current of 60 A at a single-phase supply voltage of 230 V. What would be the minimum size of the conductor to be used to achieve at least 5% voltage drop? The total conductor length is 300 ft. ..
- E A 2-wire d.c. ring distributor is 400 m long and is fed at 240 V at point A. At point B, 150 m from A, a load of 150 A is taken and at C, 100 m from B, with load of 40 A and at D, 25m in the opposite direction from A, a load of 200 A is taken. If the resistance per 100 m of single conductor is 0.04 22, find: (i) Current in each section of distributor (ii) Voltage at points B, C and D.The minimum size raceway for the following feeder conductors is: a. Three, 250 kcmil conductors with XHHW insulation b. One, 3/0 AWG conductor with XHHW insulation c. One, 4 AWG conductor with XHHW insulation The minimum size raceway for the following branch circuit conductors is: a. Twelve, 6 AWG conductors with THHN insulation b. Nine, 8 AWG conductors with THHN insulation c. Eighteen, 10 AWG conductor with THHN insulation d. One, 10 AWG equipment grounding conductor with THHN insulation33 kv single core cable has a radius of conductor of 0.6 cm. The insulation martial has two layers. The thickness of the first and second layers are 0.8 cm and 0.4 cm respectively. The relative permittivity of the first and second layers are 4 and 3 respectively. Find 3- The minimum electric stress of the second layer. 4- The minimum electric stress of the first layer.
- Single core cable design for 25 kV. The radius of conductor is 0.5 cm. The insulation material consists of two layers. The thickness of each layer is 2 cm. The voltage of first and second layers are 20 kV, 5 kV respectively. The minimum Electric stress of the cable is * 9.45 kV/cm 1.89 kV /cm O 1.25 kV/cm 5.78 kV/cm Non of themIn an outdoor substation the three bus-bar conductors are supported by units of post type insulators. Each unit consists of a stack of 3 pin type insulators fixed one on the top of the other. The voltage across the lowest insulator is 13kV and that across the next unit is 12KV. Estimate: 17. i. ratio of mutual to self-capacitance ii. the bus-bar voltage of the substation. iii. Efficiency across the string of insulators:Two circuits are arrange as shown in figure (1), (a and b) each one of them has two identical conductors, the vertical distance between each conductor in the same circuit is 1 m, the distance horizontlly between circuits is 30 cm, take 1 cm as diamter for each conductors. Derermine the inductance per km of the double circuit ? a a' b' FIGURE (1) --