Vestas Service Technician Interview Questions and Answers for Experienced

Q1. What is difference between earth and neutral ?
Ans. 
Earth is the connection between an electrical circuit and the ground, while neutral is the return path for current in a circuit.
• Earth is a safety measure to prevent electric shock and protect against electrical faults.

• Neutral carries the current back to the source in a circuit.

• Earth is typically connected to the ground through a grounding electrode.

• Neutral is usually connected to the center tap of a transformer.

• In a th...read more
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About the T.B.T.& P.T.W.
About the Module, SCB, Cables ,Inverter, IDT ,HT-LT Panel ,ICOG Panel And Other Electrical Elements and all block successfully charged

Cable colour coding
All panel wiring & wiring coding

Q1. Which device to use for testing insulation?
Ans. 
A megohmmeter is used for testing insulation.
• A megohmmeter, also known as an insulation tester, is used to measure the resistance of insulation materials.

• It applies a high voltage to the insulation and measures the current flowing through it.

• The results help determine if the insulation is in good condition or if there are any faults or leaks.

• Megohmmeters are commonly used in electrical and electronic industries to ensu...read more
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Q1. What is igbt and working
Ans. 
IGBT stands for Insulated Gate Bipolar Transistor, a semiconductor device used for switching applications in power electronics.
• IGBT is a type of transistor that combines the high efficiency of a bipolar junction transistor (BJT) with the high input impedance of a MOSFET.

• It is commonly used in applications such as motor drives, inverters, and power supplies.

• IGBTs are used for high power applications due to their ability...read more
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Q2. What is ups and working
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Q1. Line diagram of WTG
Ans. 
A line diagram of a wind turbine generator (WTG) shows the flow of energy from wind to electricity.
• The diagram typically includes the rotor blades, gearbox, generator, and power electronics

• The blades capture wind energy and turn the rotor, which drives the gearbox

• The gearbox increases the rotational speed and sends it to the generator

• The generator converts the rotational energy into electrical energy

• The power electroni...read more
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Q2. Working of DFIG converters
Ans. 
DFIG converters are used in wind turbines to convert variable frequency AC power to DC power and back to AC power.
• DFIG stands for Doubly Fed Induction Generator

• The converter consists of two back-to-back voltage source converters

• One converter controls the rotor current and the other controls the grid current

• The rotor current is controlled to maintain a constant torque on the turbine

• The grid current is controlled to main...read more
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