The maximum allowable voltage drop, from the supply side of the consumers ser conductors, to the point of utilization shall not exceed: . ● 10% • 3% • 5% • 4% TECK-90 cable may be used as a feeder for underground services? . • True. False.
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- In a string of suspension insulator with three units, the line unit has 20kV and k=0.35. The voltage across tower unit is........ and across middle unit is.......In 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 insulatorsA 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. ..
- Some electricians do not bother to calculate the minimum size of neutral service conductor. They size the minimum ungrounded conductor size and then use this information to determine the minimum neutral conductor size. Explain how they determine the minimum neutral size using the minimum ungrounded conductor siz2. What's the primary instrument for locating a break in a cable during emergency maintenance?A. OSAB. OTDRC. MultimeterD. Power meterThe 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.
- The value of symmetrical short circuit current is ___________________ at time t=0. Zero Minimum Unity MaximumFill in the blanks 1. Grounding is connecting …….. of electrical equipment to earth. 2. When a …………………………….… fault occurs on an ungrounded neutral system, the potential of the healthy phases rise to the line voltage. 3. The method of reactance grounding is not used because of ……………………… appearing under fault conditions. 4. The cosine of the angle between the ………………………………………. and the ………………………………...…… is called the sending end power factor. 5. The AC power delivered to a load is equal to ………........What is the different b/w solid type cables and pressure cables (oil and gas)... The course is power transmission system and the topic is under ground cables...
- The single line diagram of a power system is shown in Figure Q2.1 including generator and transformer winding connection and earthing details. The parameters for this system have been calculated on a common 100 MVA base and are given in Table Q2.1. All resistances and shunt susceptances are neglected. This system experiences a single line to ground fault at a point F on line L1. The point F is at a distance d from Bus 4 along the line L1. The total length ?? of the line L1 is 50 km. Note that the location of ?? is not drawn to scale in Figure Q2.1. The fault current at the fault point F is measured to be 6.106 kA. i) Determine the zero, positive, and negative sequence Thevenin equivalent impedances as seen at the fault point F. These should be evaluated in per unit and shown as a function of d.ii) Use the sequence impedances calculated in part (i) to determine the distance d of the fault (in km) from Bus 4.3. The three bus-bar conductors in an outdoor sub-station are supplied by units ofpost 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. [38-8 kV]b) The single line diagram of a power system is shown in Figure Q2.1 including generator and transformer winding connection and earthing details. The parameters for this system have been calculated on a common 100 MVA base and are given in Table Q2.1. All resistances and shunt susceptances are neglected. This system experiences a single line to ground fault at a point F on line L1. The point F is at a distance d from Bus 4 along the line LI. The total length of the line L1 is 50 km. Note that the location of d is not drawn to scale in Figure Q2.1. The fault current at the fault point F is measured to be 6.106 kA. G1 G1 G2 i) G2 T1 T2 T3 L1 11) 2 Rated voltage (kV) 20 20 20/33 20/33 33/11 11 T1 ΔΕ T2 T3 Figure Q2.1 Table Q2.1 Zero sequence reactance Xo (p.u.) 0.20 0.15 0.12 0.20 0.20 1.20 Positive sequence reactance X₁ (p.u.) 0.30 0.25 0.12 0.20 0.20 0.50 UNIVERSITY OF LIVERPOOL L1 (l-d) 5 Negative sequence reactance X₂ (p.u.) 0.35 0.30 0.12 0.20 0.20 0.50 Determine the zero, positive,…