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The operation of a Megger is based on which of the following?
- a)Dynamometer
- b)Electrostatic meter
- c)Moving coil meter
- d)Moving iron meter
Correct answer is option 'C'. Can you explain this answer?
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The operation of a Megger is based on which of the following?a)Dynamom...
- Megger is a portable instrument to measure high insulation resistances
- It basically works on the principle of electromagnetic induction
- The electrical power to a megger is provided by permanent magnet D.C. generator
- The test voltages are usually of order 500, 1000, or 2500 V are generated by a hand-driven generator (permanent magnet D.C. generator)
- The operation of a megger is based on moving coil meter
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The operation of a Megger is based on which of the following?a)Dynamom...
The correct answer is option 'C', Moving coil meter.
A Megger, also known as an insulation tester, is a specialized electrical instrument used to measure the insulation resistance of electrical equipment and systems. It is commonly used to test the insulation of cables, motors, transformers, and other electrical devices. The operation of a Megger is based on the principle of a moving coil meter.
Explanation:
Moving coil meters are commonly used in many types of electrical measuring instruments, including Meggers. The basic principle behind a moving coil meter is the interaction between a magnetic field and an electric current flowing through a coil.
1. Moving Coil Meter:
- A moving coil meter consists of a coil of wire suspended in a magnetic field. When a current flows through the coil, it produces a magnetic field around the coil.
- The magnetic field produced by the coil interacts with the magnetic field of a permanent magnet, causing a torque to be exerted on the coil.
- This torque causes the coil to rotate, and the rotation is proportional to the current flowing through the coil.
- The rotation of the coil is typically translated into a needle or pointer movement on a calibrated scale, indicating the value of the current being measured.
2. Megger Operation:
- In the case of a Megger, the moving coil meter is used to measure the resistance of the insulation material.
- When the Megger is connected to the equipment or system being tested, a high voltage is applied across the insulation.
- If the insulation is in good condition, it will resist the flow of current, resulting in a high resistance reading on the moving coil meter.
- On the other hand, if the insulation is damaged or deteriorated, it will allow current to flow, resulting in a low resistance reading on the meter.
- The Megger provides a quantitative measurement of the insulation resistance, allowing the user to determine the condition of the insulation.
In summary, the operation of a Megger is based on the principle of a moving coil meter, where the rotation of the coil is proportional to the resistance of the insulation being tested.
A Megger, also known as an insulation tester, is a specialized electrical instrument used to measure the insulation resistance of electrical equipment and systems. It is commonly used to test the insulation of cables, motors, transformers, and other electrical devices. The operation of a Megger is based on the principle of a moving coil meter.
Explanation:
Moving coil meters are commonly used in many types of electrical measuring instruments, including Meggers. The basic principle behind a moving coil meter is the interaction between a magnetic field and an electric current flowing through a coil.
1. Moving Coil Meter:
- A moving coil meter consists of a coil of wire suspended in a magnetic field. When a current flows through the coil, it produces a magnetic field around the coil.
- The magnetic field produced by the coil interacts with the magnetic field of a permanent magnet, causing a torque to be exerted on the coil.
- This torque causes the coil to rotate, and the rotation is proportional to the current flowing through the coil.
- The rotation of the coil is typically translated into a needle or pointer movement on a calibrated scale, indicating the value of the current being measured.
2. Megger Operation:
- In the case of a Megger, the moving coil meter is used to measure the resistance of the insulation material.
- When the Megger is connected to the equipment or system being tested, a high voltage is applied across the insulation.
- If the insulation is in good condition, it will resist the flow of current, resulting in a high resistance reading on the moving coil meter.
- On the other hand, if the insulation is damaged or deteriorated, it will allow current to flow, resulting in a low resistance reading on the meter.
- The Megger provides a quantitative measurement of the insulation resistance, allowing the user to determine the condition of the insulation.
In summary, the operation of a Megger is based on the principle of a moving coil meter, where the rotation of the coil is proportional to the resistance of the insulation being tested.
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The operation of a Megger is based on which of the following?a)Dynamometerb)Electrostatic meterc)Moving coil meterd)Moving iron meterCorrect answer is option 'C'. Can you explain this answer?
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