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- 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 15kV and that across the next unit is 12kV. Estimate: ratio of mutual to self-capacitance i. the bus-bar voltage of the substation. Efficiency across the string of insulators ii. iii.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 15kV and that across the next unit is 12kV. Estimate: i. ratio of mutual to self-capacitance ii. the bus-bar voltage of the substation. iii. Efficiency across the string of insulatorsThe property of insulating material which makes the breakdown voltage high in a cable is ...... Good Mechanical strength O High conductivity O High dielectric strength O High insulation resistance
- The number of disc insulators used in a suspension insulator setup with string efficiency 80 %, phase voltage 33 kV, and the voltage across insulator nearest to conductor 11 kV is .......................... Complete the answer.7. TY Hat CHICL Ans. 1. Iron los.........varies approximately as V². 2. Cu loss..........it also varies as ² but decreases with an increase in voltage if constant kVA output is assumed. 3. Efficiency...........for distribution transformers, efficiency at fractional loads decreases with in- crease in voltage while at full load or overload it increases with increase in voltage and vice- versa. 4. Regulation..........it varies as but decreases with increase in voltage if constant kVA output is assumed. 5. Heating.........for constant kVA output, iron temperatures increase whereas Cu temperatures decrease with increase in voltages and vice-versa. quemsDiscuss typical structure of the modern electrical grid. Include all elements and provide short description of their role in the system
- 5. A 2-wire DC ring distributor is 375m long and is fed with 300V at point A. At point B, 200m from A, load of 150A is taken and at point C, 100m in the opposite direction, a load of 100A is taken. If the resistance per 100m of single conductor is 0.03, find: i. Current in each section of distributor ii. Voltage at points B and C iii. Point of minimum potentialIn 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.......Consider a 3-phase, 50 HZ, 11 KV distribution system. Each of conductors is suspended by an insulator string having two identical porcelain insulators. The self-capacitance of the insulator is 5 times the shunt capacitance between link and ground. Find the voltages across two insulators.
- What is ohms law? give its applications.What effects are produced by change in voltage? 1. Iron los..........varies approximately as V². 2. Cu loss..........it also varies as V² but decreases with an increase in voltage if constant kVA output is assumed. 3. Efficiency...........for distribution transformers, efficiency at fractional loads decreases with in- crease in voltage while at full load or overload it increases with increase in voltage and vice- versa. 4. Regulation..........it varies as but decreases with increase in voltage if constant kVA output is assumed. 5. Heating.........for constant kVA output, iron temperatures increase whereas Cu temperatures decrease with increase in voltages and vice-versa.Q2/3-phase.E.W.C. R using center tap transformer supplies highly inductive load, find: 1. The average load voltage with and without FWD and discusses these cases. 2-lf firing angle equal to 45°, the supply voltage is240v, transformer ratio is (2/1). Calculate the DC current& voltage of this case. 3- Draw all waveforms diagram. 4- what are the difference between the type of connection (Delta or Star).