1. A balanced, three-phase, 900V system is supplying a balanced load connected in delta. A three-phase wattmeter (measuring total three-phase power) is connected to the supply and an ammeter is connected to one of the supply phases. Each load consists of a resistance in parallel with an inductive reactance. a. If the wattmeter reads 14.1 kW, what is the resistance of each load? b. If the ammeter reads 10 A What is the impedance (Z) of each load? c. What is the reactance (X)?

Q: A 4.4 kVA power and 220 V 1-phase load is fed from a distribution line with a total resistance of…

A: Given, Zl=0.2+j0.3Load Voltage = 220 VLoad Power = 4.4 KVAPower factor =1

Q: Three Equal Impedances, each consisting of R and C in series are connected in star and are supplied…

A: R and C in series are connected in star,supply voltage Vs = 400 V, supply frequency f = 50 Hz,load…

Q: Three coils are connected in delta across a 240 V, three-phase supply. The line current is 20 A. The…

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Q: Star circuit to three-phase variable power supply. Set the resistors to a value of 300 Ω and the…

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Q: In a parallel, 2 wye-connected ac generators are linked. The 1st generator has a per-phase impedance…

A: Active power delivered by the Generator = Vt* I Power factor . Reactive power delivered by the…

Q: Complete the table and provide the logic circuit diagram.

A: The latch is an asynchronous device. It is a level-triggered device. It checks the input and changes…

Q: The power flowing in a 3-0, 3 wire balanced load system is measured by the two wattmeter method. The…

A: Given values are - WA=W1=500WWB=W2=-100W Given that power flowing in 3 phase 3 wire balanced load…

Q: For an AC power distribution circuit, the line voltage is 480V and the line current is 53A. The…

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Q: 2. Consider the three phase generator below: Phase A Phase B N Phase C N S a) If the stator rotates…

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Q: 4. Three impedance of R= 102 and L=5mH are connected in STAR across a 500V,50HZ 30 AC supply. Find…

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Q: The figure shows a 3-phase balanced negative sequence electrical system. Vcn = 200 /0° Vrms. Vbn = a…

A: Given

Q: Three similar coils, each of resistance 10 Q and reactance 10 Q, are connected in star across a…

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Q: When the two-wattmeter method is used to measure the input power of a balanced load, the readings on…

A: Given,

Q: What is reading of both wattmeter, when measuring the power of three-phase three wire system having…

A: Given: Input power, P1+P2=5 kW    .....     1 Power factor, cosϕ=0.866

Q: A voltage of (380V) is provided on a three- phase star-shaped load (STAR-Y) that contains a…

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Q: Power in a single phase 3.3 kV, 1000 KVA load is to be measured using a 250V/5A wattmeter. Design…

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Q: Answer is letter B. 47.46 microFarad

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Q: A factory has the following load with power factor of 0.9 lagging in each phase. Red phase 40 A,…

A: Given IR=40 AIY=50 AIB=60 AV=400 V Taking VRN as reference VRN=4003VRN=230.9 V VRN=230.9∠0°…

Q: K(s+1) s(1 + Ts)(1+ 2s) G(8)H(8) =

A: The answer to the above problem is solved below:-

Q: Question The coils of a wattmeter have resistances 0.01 Q and 1000 Q; their inductance may be…

A: Given- Resistances- R=0.01 & 1000 Ω, Current I=25A, Power factor PF=0.8, Load terminal V=30 V.…

Q: Problem 2: Question 2. Consider the three phase generator below: Phase A Phase B N Phase C N a) If…

A: The solution is given below

Q: 20- The data of the devices used in a 220 V sinusoidal single-phase workshop are given below.…

A: In the question A single phase system given.  The supplied voltage = 220 V According to this; What…

Q: 1) Principle and features of different methods for measuring three-phase power. 2) Discuss the…

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Q: Prove that two-wattmeter method can be used to measure three-phase power in a star-connected load.

A: This is an easy problem. Look below for solution..

Q: Explain three phase power measurement using three wattmeter method and write the drawbacks of this…

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Q: The power flowing in a 3-phase, 3 wire, balanced load system is measured by the two wattmeter the…

A: Given, WA = 5000 WWB = -1000 W Therefore, WA + WB = 4000 WWA - WB = 6000 W Where, WA - Wattmeter A…

Q: 1. With an elegant diagram, discuss the three-phase power measurement using the three-watt meter…

A: This is a very simple question based on measurement subject .In this we will understand how the…

Q: 1. On a 120/208-V four wire Y system, two lamps are connected from phase A to neutral, 5 lamps from…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: 2. A three phase Y connected balanced resistive load is connected to a three phase Y connected…

A: As per Bartleby guidelines we are allowed to solve only one question three subparts,please ask the…

Q: What is the current in each phase of a balanced delta-connected resistive load when the line current…

A: In this question we will find phase current in delta connection....

Q: 3. When calculating power in a three phase circuit, you must first know if it in a Wye or Delta…

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Q: If the total power is 450 kW in a power measurement of a 3- Phase delta connected load by 1-…

A: Total power is given as,  P = 450 W.

Q: A wattmeter

A: Given-Resistance of current coil=1.2 ohmReading on wattmeter= 200 WattAmmeter reading= 4 A

Q: A 3 phase delta source is connected to a balanced delta load with a power factor of 0.37. The phase…

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Q: 15. Two wattmeters are used to measure the power drawn by a balanced three phase load from a V,…

A: Given  Two wattmeter method is used to measure balanced three phase load The wattmeters are…

Power Measurement

According to Blondel's theorem, the total power is measured with one less number of wattmeters than the number of wires present in the system. So, a single-phase and two-wire system will require one wattmeter and a single-phase and the three-wire system will require two wattmeters, and a three-phase and the three-wire system will also require two wattmeters and a three-phase and the four-wire system will require three wattmeter devices. The wattmeter is a device that measures power using one voltage and one current input as shown in the above figure. Multiple current or voltage input pair cables are used by many power analyzers and digital storage oscilloscopes (DSOs) for measuring watts, in effect within a single instrument acting as multiple wattmeters. It is possible to measure three-phase and four-wire power with one correctly specified power analyzer.