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In large oil immersed transformers, we can find a cylindrical object installed in the pipe connecting the conservator to the main tank. This cylindrical object, that looks like a solenoid valve is called Buchholz relay. It is a type of oil activated relays. It can be found in all oil immersed transformers rated higher than 500kva. 
Before getting into the topic, we have to keep two points in mind.

1. Conventional Current flow. (The way Current is said to flow historically)
2. ‎Actual current flow. (The way Current actually flows).

By definition, current is the flow of charges, basically electrons. It is said to flow from a point of higher potential to lower potential.

What is Kilowatt?

Kilowatt is the unit of power. It is the product of voltage, ampere and power factor. It is also called as real power.

One kilowatt(kW) is equal to thousand watts(W).
Kilovolt ampere to kilowatts

 What is kilo-volt ampere?

Kilo volt-ampere is the unit of apparent power. It is independent of power factor. 

One kilovolt-amp(kVA) is equal to thousand volt-amp(VA).

How to convert kilo-volt-ampere to kilowatt?

To convert kilo-volt-ampere to kilowatt, multiply the KVA to the power factor of the circuit.

kW = KVA X P.F(Power factor)

Use the following tool to convert kVA to kW:



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KVA TO KW CONVERTER





Enter Kilovolts Ampere value







Enter Power Factor (P.F.)







Kilowatt value











How to use the tool:

1. Input the kVA value.
2. Input the power factor.
3. Click on calculate button.
4. Converted value will be displayed in kW.
5. Check the power factor if "Incorrect power factor is displayed".




Related Searches:
1. How to convert kVA to kW?
2. kVA to kW converter online.
3. Online kVA converter.

PLC - Programmable Logic Controller

PLC
Schneider Modicon
Programmable logic controllers are electronic devices used to control a process. It consists of CPU; Input and output devices, power supply, communication and redundancy units. PLCs are preprogrammed based on their application and put into operation. A PLC accepts inputs from the field, process the input based on the programming done and outputs the commands to the field equipment. It can also accept commands from the plant operators through SCADA and give commands to the field equipment. The features of PLCs vary from one manufacturer to the other but the basic architecture remains the same.

AC motor stall
Induction motor Torque-Speed Characteristics
Stalling is a condition at which a motor stops rotating. This condition occurs when the torque required by the load is more than the maximum torque (Breakdown torque) that can be generated by the motor. At this condition, the motor drains the maximum current and the speed comes zero.
DC Motor Torque speed Characteristics
Every motor is designed to spin a particular amount of load. When the load is further increased above its overload region, the speed of the motor gradually reduces and the motor stalls. The Slip during stalling of a motor is 100%. Since the motor is not rotating, there will be no back EMF and so the power consumption will be the maximum. 

Reasons for stalling of motors:

1. Electrical: Missing out of one phase (two phasing) or single phasing of input supply
2. Mechanical: Rotor jam, overload or load unable to move.

Stall Current

Stall current is the current drawn by the motor at locked rotor condition. It is the highest current a motor can draw and is proportional to its rotor resistance. If stall current is drawn by a motor for a longer time, motor gets overheated causing damage of winding.

Stall torque 

Stall torque is the load torque at which the motor shaft stops rotating. It is also known as locked rotor torque.

Related Searches

Induction Motor Stalling
Motor Stall Protection
Motor Stall Fault
Motor Stall Current
Safe Stall Time Of Motor
Motor Stall Torque Calculation
Maximum Continuous Stall Torque
Locked Rotor Protection Relay


As the name indicates, starters are used to start or stop a motor. It consists of an electromechanical switch and protection devices (overload and/or short-circuit protection).

Horsepower and kilowatt are two different units of measuring power. Watts is the SI unit of power. It is a well-defined and normally used unit.

This is a simple tool to instantaneously convert kilowatt into horsepower.

How to convert kilowatts into horsepower?

Mechanic / Hydraulic horsepower to kilowatts

One mechanic or hydraulic horsepower is equal to 0.745699872 kilowatts:
1 hp(I) = 745.699872 W = 0.745699872 kW
Therefore,
P(kW) = 0.745699872 ⋅ P(hp)

Electrical horsepower to kilowatts

One electrical horsepower is equal to 0.746 kilowatts:
1 hp(E) = 746 W = 0.746 kW
Therefore,
P(kW) = 0.746 ⋅ P(hp)

Metric horsepower to kilowatts

One metric horsepower is equal to 0.73549875 kilowatts:
1 hp(M) = 735.49875 W = 0.73549875 kW
Therefore,
P(kW) = 0.73549875 ⋅ P(hp)

Horsepower to kilowatts Convertor


 
hp
   
Result in kilowatts: kW





The following are few standard KW to HP conversions


Kilowatt (KW)
Mechanic horsepower
(hp(I))
Electric horsepower (hp(E))
Metric horsepower (hp(M))
0.1KW
0.080HP
0.080HP
0.082HP
0.1KW
0.121HP
0.121HP
0.122HP
0.1KW
0.161HP
0.161HP
0.163HP
0.2KW
0.241HP
0.241HP
0.245HP
0.3KW
0.335HP
0.335HP
0.340HP
0.4KW
0.496HP
0.496HP
0.503HP
0.6KW
0.738HP
0.737HP
0.748HP
0.8KW
1.006HP
1.005HP
1.020HP
1.0KW
1.341HP
1.340HP
1.360HP
1.1KW
1.475HP
1.475HP
1.496HP
1.5KW
2.012HP
2.011HP
2.039HP
2.0KW
2.682HP
2.681HP
2.719HP
2.2KW
2.950HP
2.949HP
2.991HP
3.0KW
4.023HP
4.021HP
4.079HP
4.0KW
5.364HP
5.362HP
5.438HP
5.5KW
7.376HP
7.373HP
7.478HP
7.5KW
10.058HP
10.054HP
10.197HP
11.0KW
14.751HP
14.745HP
14.956HP
15.0KW
20.115HP
20.107HP
20.394HP
18.5KW
24.809HP
24.799HP
25.153HP
22.0KW
29.502HP
29.491HP
29.912HP
30.0KW
40.231HP
40.214HP
40.789HP
37.0KW
49.618HP
49.598HP
50.306HP
45.0KW
60.346HP
60.322HP
61.183HP
55.0KW
73.756HP
73.727HP
74.779HP
75.0KW
100.577HP
100.536HP
101.972HP
90.0KW
120.692HP
120.643HP
122.366HP
110.0KW
147.512HP
147.453HP
149.558HP
132.0KW
177.015HP
176.944HP
179.470HP
160.0KW
214.564HP
214.477HP
217.540HP
200.0KW
268.204HP
268.097HP
271.924HP
250.0KW
335.256HP
335.121HP
339.906HP
315.0KW
422.422HP
422.252HP
428.281HP
355.0KW
476.063HP
475.871HP
482.666HP
400.0KW
536.409HP
536.193HP
543.849HP
500.0KW
670.511HP
670.242HP
679.811HP
560.0KW
750.972HP
750.670HP
761.388HP
630.0KW
844.844HP
844.504HP
856.562HP
710.0KW
952.126HP
951.743HP
965.332HP
800.0KW
1072.818HP
1072.386HP
1087.698HP
900.0KW
1206.920HP
1206.435HP
1223.660HP
1000.0KW
1341.022HP
1340.483HP
1359.622HP

Voltage division rule

Voltage division rule is one of the basic rules of circuit analysis. It is applicable to all series circuits and combination circuits. Series circuit always acts as a Voltage divider. In a series circuit, the same current flows through each resistance. Hence the voltage drops across each resistor are proportional to their ohmic value.