Megger connections for testing DC motors and generators in Visual Studio .NET

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1-11 Megger connections for testing DC motors and generators
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Testing AC Motors
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To test an AC motor, first disconnect the motor from its power source, either by using the switch or by disconnecting the wiring at the motor terminals If the switch is used, remember that the insulation resistances of the connecting wire, switch panel, and contacts will all be measured at the same time Connect the positive megger lead to one of the motor lines and the negative test lead to the frame of the motor, as shown in Figure 1-12 Compare meter readings to the established insulation resistance minimums
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1-12 Method of testing an AC motor
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Testing Circuit Breakers
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Disconnect the circuit breaker from the line and connect the megger black lead to the frame or ground Check the insulation resistance of each terminal to ground by connecting the red (positive) lead to each terminal in turn and making the measurements Next, open the breaker and measure the insulation resistance between terminals by putting one lead on one terminal and the other on the second for a twoterminal breaker; for a three-pole breaker, check among poles 1-2, 2-3, and 1-3
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Testing Safety Switches and Switchgear
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Completely disconnect from line and relay wiring before testing When testing manually operated switches, measure the insulation resistance from ground to terminals and between terminals When testing electrically operated switches check the insulation resistance of the coil or coils and contacts For coils, connect one megger lead to one of the coil leads and the other to ground Next, test between the coil lead and core iron or solenoid element
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Testing Ground Resistance
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Figure 1-13 shows the simplest method for testing the resistance of earth The direct or two-terminal test consists of connecting terminals P1 and C1 of the megohmmeter to the ground under test, and terminals P2 and C2 to an all-metal underground water-piping system If the water piping covers a large area, its resistance should be very low (only be 17
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1-13 Direct method of earth-resistance testing
a fraction of an ohm) Thus, the megohmmeter reading will be that of the earth or grounding electrode being tested
Miscellaneous Testing Instruments
Ammeters, voltmeters, and megohmmeters are the most common analog devices used for field testing and troubleshooting applications However, several other specialized types of test instruments should be mentioned briefly
Frequency Meter
Frequency is the number of cycles completed each second by a given AC voltage, usually expressed in hertz (Hz); 1 Hz = 1 cycle per second The frequency meter is used with AC powerproducing devices like generators to ensure that the correct frequency is being produced Failure to produce the correct frequency can result in overheating and component damage
Power Factor Meter
Power factor is the ratio of the true power (voltamperes) to apparent power (watts), and it depends on the phase difference between current and voltage Three-phase power factor meters are installed in switchboards Many utilities charge large commercial and industrial users a penalty if power factor falls below 90 percent; so these users try to maintain high power factor at all times A high power factor provides better voltage regulation and stability 19
Tachometers
A tachometer is a device that indicates or records the speed of rotating equipment (motors and generators) in revolutions per minute (rpm) There are several different types: Vibrating-reed Tachometer This instrument is simply held against the motor, turbine, pump, compressor, or other rotating equipment, and the speed is shown by the vibration of a steel reed, which is tuned to a certain standard speed Photo Tachometer This instrument aims a light at the rotating shaft on which there is a contrasting color such as a mark, a chalk line, or a light-reflective strip or tape The rotational speed in rpm is read from an indicating scale Photo tachometers are especially useful on relatively inaccessible rotational equipment such as motors, fans, grinding wheels, and other similar machines where it is difficult, if not impossible, to make contact with the rotational unit Electric Tachometer This consists of a small generator that is belted or geared to the equipment whose speed is to be measured The voltage produced in the generator varies directly with the rotational speed of the generator Since this speed is directly proportional to the speed of the machine under test, the amount of the generated voltage is a measure of the speed 20
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