Description : Why we are use 11KV / 22KV / 33KV / 66KV / 110KV / 230KV / 440KV this type of ratio. Why can’t we use other voltage ratio like 54KV / 99KV etc.
Last Answer : 1. When an alternator generates voltage, its rms value is given by 4.4*f*$*t, where $ is value of total flux per pole. So we can see all the voltages are made inevitably multiple of this value (1.1, ... and which comes out to be 1.11 so we cant have a combination of other then a multiple of 1.11.
Description : Why Generation Voltage in Power Plant is Low (11kV to 33kV) ?
Last Answer : Generally electrical power is generated at low voltages (generation voltage will be around 11 to 33kV) depending on the power output rating of the generator and transmitted to the load centers by stepping up the ... operate at 23.5 kV with line currents of about 19,000 A at 0.85 power factor.
Description : Why transmission line 11Kv OR 33KV, 66Kv not in 10kv 20kv?
Last Answer : Due to the form factor=1.11, so output voltage must be multiply of form factor, so we get 11, 22, 33 the answers mentioning the form factor 1.1 are correct. Just one clarification... 1.1 is ... available with terminal voltages from 10.5 kV to 15.5 kV so generation in multiples of 11 does not arise.
Description : Why syn. generators are used for the production of electricity?
Last Answer : A:synchronous machines have capability to work on different power factor. Hence syn. generators are used for the production of electricity.
Description : High tension cables are generally used up to (a) 11kV (b) 33kV (c) 66 kV (d) 132 kV
Last Answer : (a) 11kV
Description : Why is transmission line 11kV, 33kV 66kV Not Is 10kV, 20kV, 30kV ?
Last Answer : 10kv plus to compensate losses in olden days 1kv were added and transmitted. Since all equipment used for transmission have a multiple of 11 from olden days, still that is being followed even though the losses are ... voltages, multiples of 11 is eazy for winding ratios.. i.e. 11kv to 33kv is 1:3.
Description : Why we use ac system in India why not dc ?
Last Answer : A:Firstly, the output of power stations comes from a rotary turbine, which by it's nature is AC and therefore requires no power electronics to convert to DC. Secondly it is much easier to ... the sine wave current will naturally tend to zero at some point making the current easier to interrupt.
Description : What are the various types of tariff?
Last Answer : 1. Simple tariff 2. Flat rate tariff 3. Block rate tariff 4. Two-part tariff 5. Maximum demand tariff 6. Power factor tariff 7. Three-part tariff
Description : What is tariff?
Last Answer : The rate at which electrical energy is supplied to a consumer is known as tariff. The tariff should include the following items: (i) Recovery of cost of producing electrical energy at the power ... of cost of operation and maintenance of supply (iv) A suitable profit on the capital investment.
Description : How can we reduce the effect of corona?
Last Answer : 1. By increasing conductor size: By increasing conductor size, the voltage at which corona occurs is raised and hence corona effects are considerably reduced. 2. By increasing conductor spacing: ... , the voltage at which corona occurs is raised and hence corona effects can be eliminated.
Description : What is corona?
Last Answer : The phenomenon of violet glow, hissing noise and production of ozone gas in an overhead transmission line is known as corona.
Description : What is meant by Sag?
Last Answer : The difference in level between points of supports and the lowest point on the conductor is called sag.
Description : What is difference between fuse and breaker?
Last Answer : A: (i) Fuse performs both detection and interruption functions. Circuit breaker performs interruption function only. The detection of fault is made by relay system. (ii) The breaking capacity of ... , replacement is required in the fuse. In case of circuit breaker, replacement is not required.
Description : Which type of motor is used in trains, what is the rating of supply used?
Last Answer : A:Dc series is in the trains to get high starting torque while starting of the trains and operating voltage is 1500v dc.
Description : When we connect the large capacitor bank in series ?
Last Answer : A :we connect large capacitor bank in series to improve the voltage power supply at the load end in balanced transmission line when there is considerable voltage drop along the balanced transmission line due ... - %6 )of the rated high terminal voltage )the large capacitor bank is used in series.
Description : What is reverse power relay?
Last Answer : A:Reverse Power flow relay are used in generating stations's protection. A generating stations is supposed to fed power to the grid and in case generating units are off,there is no generation in the ... power from grid. To stop the flow of power from grid to generator we use reverse power relay.
Description : What is the difference between over voltage relay and over current relay?
Last Answer : A:The current increases not only for over voltages but also for under voltage(As most of the loads are non-linear in nature). So,the over voltage protection & over current protection are completely ... , for a better protection of the system.It should have both over voltage & over current relay.
Description : What is derating?
Last Answer : A:The current currying of cables will change depending upon the site temperature (location of site), type of run (it will run through duct, trench, buried etc.), number of tray, depth ... of cable reduce than current currying capacity (which given to cable Catalogue) this is called derating.
Description : Define IDMT relay?
Last Answer : It is an Inverse Definite Minimum Time relay. In IDMT relay its operating is inversely proportional and also a characteristic of minimum time after which this relay operates. It is inverse in the sense; the tripping time will decrease as the magnitude of fault current increase.
Description : Where should the lighting arrestor be placed in distribution lines?
Last Answer : A:Near distribution transformers and out going feeders of 11kv and incomming feeder of 33kv and near power transformers in sub-stations.
Description : What is the difference between MCB & MCCB, Where it can be used?
Last Answer : A: MCB is miniature circuit breaker which is thermal operated for overload condition and magnetically operated for short circuit protection. It is available in small current rating. MCCB is moulded case ... frequency may be inbuilt. Normally it is used where normal current is more than 100 A.
Description : Explain types of Earthing.
Last Answer : A:The two types of earthing are Equipment earthing and system earthing. In Equipment earthing: body ( non conducting part) of the equipment should be earthed to safegaurd the human beings ... . This type of earthing is further classified into directly earthed, Impedance earthing, resistive earthing.
Description : What is Ferranti effect?
Last Answer : A: When receiving end voltage is greater than the sending end voltage.
Description : What is buchholz relay and the significance of it in to the transformer?
Last Answer : A:Buchholz relay is a gas based relay which is used for the protection of transformer from its internal faults. whenever any internal fault occurs in a transformer, the buchholz relay at once gives an ... then it stop its sound itself other wise it trips the circuit by its own tripping mechanism.
Description : What is the difference between Isolator and Circuit Breaker?
Last Answer : A: Isolator is a off load device which is used for isolating the downstream circuits from upstream circuits for the reason of any maintenance on downstream circuits. it is manually operated ... specification 1) rated current 2) short circuit breaking capacity and 3) Instantaneous tripping current.
Description : what is power factor? whether it should be high or low? why?
Last Answer : A:Power factor is the ratio of true power to apparent power. It has to be ideally 1. If it is too low then cable over heating & equipment overloading will occur. if it is greater than 1 then load will ... : 0.95 to meet actual power, load has to draw less current(V constant),result in less losses).
Description : Explain the working principle of the circuit breaker
Last Answer : A:Circuit Breaker is one which makes or breaks the circuit.It has two contacts namely fixed contact & moving contact. Under normal condition the moving contact comes in contact with fixed contact thereby forming ... . Arc is extinguished by the Arc Quenching media like air, oil, vacuum, SF6 gas etc.
Description : What is the difference between surge arrestor and lightning arrestor?
Last Answer : A:Lightning Arrestor is installed outside and the effect of lightning is grounded where as surge arrestor installed inside panels comprising of resistors which consumes the energy and nullify the effect of surge.
Description : Why we use Vacuum Circuit Breaker in High Transmission System and not Air Circuit Breaker?
Last Answer : A:Vacuum has high arc quenching property compare to air . The dielectric strength of vacuum is equal to 8 times than air . Hence vacuum circuit breaker is used in High voltage line and air circuit breaker is used in low voltage lines.
Description : What will happen when power factor is leading in distribution of power?
Last Answer : A:If their is high power factor, i.e if the power factor is close to one: 1.losses in form of heat will be reduced, 2.cable becomes less bulky and easy to carry, and very cheap to afford, & 3. it also reduces over heating of transformers.
Description : what is ACSR cable and where we use it?
Last Answer : A: ACSR means Aluminium conductor steel reinforced, this conductor is used in transmission & distribution.
Description : Describe the operation carried out in Thermal power stations?
Last Answer : A:The water is boiled in the boiler with the help of coal. This generates steam. This steam is allowed to hit the turbine hence the turbine rotates. The turbine is coupled with generator. So the mechanical energy of turbine is converted to electrical energy by Generator.
Description : What is "pu" in electrical engineering?
Last Answer : PU stands for per unit and this will be used in power system single line diagram there it is like a huge electrical circuit with no of components (generators, transformers, loads) with different ratings (in ... into this basis. Those values are called as pu values. (p.u=actual value/base value).
Description : What is Electric traction?
Last Answer : A:Electric traction means using the electric power for traction system to drive the locomotives.
Description : What is meant by synchronous condenser?
Last Answer : An over excited synchronous motor running on no load is known as synchronous condenser. It is used to improve the power factor of the system.
Description : 44] The highest voltage for transmitting electrical power in India is A. 33kV B. 66kV C. 132kV D. 400kV
Last Answer : D. 400kv
Description : For 11kV line the inductance per km per phase will be of the order of: (A) 1 H (B) 0.1 H (C) 1 mH (D) 0.1 mH
Last Answer : For 11kV line the inductance per km per phase will be of the order of: 1 mH
Description : 63 The dielectric strength of transformer oil is expected to be A. 1kV B. 33kV C. 100kV D. 330 kV
Last Answer : B. 33kv
Description : What are the multiples of 11 up to 2000?
Last Answer : Need answer
Description : What are 3 multiples of 11?
Last Answer : They are 3 times 11 = 33
Description : A mother has three sick children. She has a 24-ounce bottle of medicine and needs to give each child eight ounces of the medicine. She is unable to get to the store and has only three ... to give each child an equal portion without having any two children drink from the same container? -Riddles
Last Answer : Fill the 5 oz. and 11 oz. Containers from the 24 oz. container. This leaves 8 oz. in the 24 oz. bottle. Next empty the 11 oz. bottle by pouring the contents into the 13 oz. bottle. Fill the ... . bottle. Finally pour the 5 oz. bottle contents into the 11 oz. bottle giving 8 oz. in this container.
Description : You expect me to believe it is a mere coincidence that two digit products of multiples of 9 add up to 9?
Last Answer : Believe what you want. it’s a fact. Think about it – 9 is one less than 10, so anything multiplied by 9 will be (10 times that number) minus (1 times that number). it’s really pretty simple logic.
Description : What is an amazing product/thing that, once you found out about it, you bought multiples of?
Last Answer : answer:Smart plugs so I can just tell Google to turn off things. Also those laundry bucket/ tub things from ikea
Description : How do you send multiples invites to your friends?
Last Answer : At this time, there isn’t any way to do that. When sending the same PM to multiple people, what I generally do is write the first one and then copy/paste that to all the others. I still have to do it one profile at a time, though.
Description : find the mean of first five multiples of 10 -Maths 9th
Last Answer : This is the correct one...
Description : Mostly ...................... or its multiples were used by the Indus Valley people in weighing measures? -History
Last Answer : 16 is the answer
Description : What is the multiples of 16？?
Last Answer : Multiples of 16: 16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, 192, 208, 224, 240, 256, 272, 288, 304, 320.
Description : the common multiples of 4 and 13, the only 2-digit number is？?
Last Answer : It's 52