More Types of Electric Motor Testing

Preventive maintenance and early testing of electric motor, generator, turbine, transformer and any other electrical machine is important to maintain the best performance of these machines. Most study shows that preventive maintenance and testing of electric motors will cost companies less than cost of downtime and repair. Here are few more advance kind of electric motor testing.

Corona Activity Analysis (Corona Camera) -  A special camera used to record the presence of partial discharge activity otherwise invisible to the naked eye.

Corona radiates energy in the ultraviolet (UV) region of the spectrum, which is invisible to the human eye. Our Corona Camera operates in the ultra-violet spectrum, enabling the skilled technicians to obtain a visible image of surface corona problems during complete daylight conditions, while your equipment remains in service. Corona images are used to generate a technical report with images of problem areas. The information contained in the report is then used to recommend corrective actions necessary to prevent future failures. In a similar manner that infrared technology detects faulty electrical connections, corona imaging detects dangerous corona activity. This type of testing is ideal for outdoor substations and transmission and distribution lines, but also has been used to pinpoint switchgear surface partial discharge locations, and for large motors.


Thermography (Thermal Imaging Camera)

The cost of system downtime has resulted in the need to identify developing electrical problems in motors before failures occur. While test equipment for motors has been available for years, only recently have advances in computerization resulted in lower costs and greater capabilities.
Today, equipment is available for energized and de-energized testing to evaluate motor condition. By performing these tests, technicians can identify developing problems and schedule service outages or install replacement units before a failure occurs and interrupts service, and Thermography is one of the best motor testing solution.
Thermal Imaging testing identifies the transfer of infrared heat radiation from an object and provides the means to scan the thermal emissions of various surfaces and display an image of temperature distribution.

Thermal imaging cameras detect radiation in the infrared range of the electromagnetic spectrum (roughly 9000–14,000 nanometers or 9–14 µm) and produce images of that radiation, called thermograms. Since infrared radiation is emitted by all objects above absolute zero according to the black body radiation law, thermography makes it possible to see one's environment with or without visible illumination. The amount of radiation emitted by an object increases with temperature; therefore, thermography allows one to see variations in temperature.

Thermography and Infrared Light
Infrared light or thermography is the use of an infrared imaging and measurement camera to "see" and "measure" thermal energy emitted from an object. Thermal, or infrared energy, is light that is not visible because its wavelength is too long to be detected by the human eye; it's the part of the electromagnetic spectrum that we perceive as heat. Unlike visible light, in the infrared world, everything with a temperature above absolute zero emits heat. Even very cold objects, like ice cubes, emit infrared.

Article Reference: Visit http://www.NewtonElectrical.com for more of kind of electric motor testing, repair and maintenance services. Includes motor & generator rewinding, motor & generator reconditioning, rebuilding motors, excitation system, vibration analysis, precision balancing, power & distribution transformers. Also mechanical services like manufacturing of shafts, rebarr, restack, manufacturing of commutator and collector rings and state of the art laser alignment.

Electric Motor Thermography (Thermal Imaging Camera)

Thermography identifies the transfer of infrared heat radiation from an object and provides the means to scan the thermal emissions of various surfaces and display an image of temperature distribution.

Thermal imaging cameras detect radiation in the infrared range of the electromagnetic spectrum (roughly 9000–14,000 nanometers or 9–14 µm) and produce images of that radiation, called thermograms. Since infrared radiation is emitted by all objects above absolute zero according to the black body radiation law, thermography makes it possible to see one's environment with or without visible illumination. The amount of radiation emitted by an object increases with temperature; therefore, thermography allows one to see variations in temperature.

More information about Thermography and Infrared Light

Infrared light or thermography is the use of an infrared imaging and measurement camera to "see" and "measure" thermal energy emitted from an object. Thermal, or infrared energy, is light that is not visible because its wavelength is too long to be detected by the human eye; it's the part of the electromagnetic spectrum that we perceive as heat. Unlike visible light, in the infrared world, everything with a temperature above absolute zero emits heat. Even very cold objects, like ice cubes, emit infrared.

This is one of the best electric motor testing and diagnostic when planning maintenance and repair motors.

Types of Electric Motor Testing

Repairing and maintaining large motors like turbine & hydro generators, large AC DC motors, diesel generators, transformers and many other kinds of heavy duty motors needs precise and accurate testing. Newton Electrical Equipment Inc specializes in this kind of equipments and would share some helpful information to keep the electric machines functions very efficient and in perfect condition to produce optimum results.

40kV Surge Testing

This test uses extremely short high voltage pulses to test electric windings and their insulation. This surge creates a voltage difference between turns. The turn to turn insulation is tested for quality. Turn to turn insulation weakness, incipient faults and all windings problems and faults are immediately visible on the oscilloscope screen.

 

Why Perform Surge Testing?

Insulation deterioration is one of the first signs that a motor is going to fail electrically. Since secondary insulation is least able to sustain wear, shorting usually occurs here before the thicker, ground wall insulation is affected. Surge testing is a non-destructive test and detects the early stages of secondary insulation deterioration.

The cost of motor failure is measured by interruption of plant output as well as extent of repair or replacement. Surge testing greatly decreases both. It detects failure early enough so that repair or replacement can be scheduled during a normal shutdown rather than an emergency outage. In addition, damage to the motor is minimized.

Power Factor & Dissipation Test

This is an AC test used to measure the bulk quality of the ground-wall insulation by measuring the dielectric loss per unit of volume of the insulation.

 

Tan delta testing - also called power factor testing (power factor is the same as tan delta within the low power factor ranges of practical electrical equipment). As power is defined as the rate of energy transfer, 'power dissipation' is a measure of the rate at which energy is dissipated, or lost, from an electrical system. When an electric current does work on a conductor, the internal energy of that conductor increases, causing its temperature to rise above the ambient (surrounding) temperature. This causes energy to dissipate away from the conductor into the surroundings, through the process of heat transfer. The rate of this heat transfer (joules per second) is termed 'power dissipation' (in watts).

EL-CID (Electro Magnetic Core Inspection Detection Test)

A portable test equipment for inspection of rotating electric machine stator cores.

Also known as Electromagnetic Core Imperfection Detector or EL CID, it was designed and used to detect insulation failures between laminations of stator cores in generators. We have been using this equipment to test large Generator and High Voltage motors of all sizes.

Originally developed by the CEGB in England, the EL CID Evolution is a third generation instrument that is proven, reliable and easy to use. The EL CID Evolution tests the condition of a stator core in less time and with fewer resources than the earlier EL CID models. The ELCID instrument can be used to test turbo-generators, hydro-generators, and large motors.

 It has the advantage that it does not require a large energy source to test the largest machines, it requires only 4% of a machines rated flux using a toroidal winding of a few turns. A 3kva supply at 110volt is sufficient to excite a machine of several hundred MVA.

For more information and services regarding electric motor repair and maintenance services, visit http://www.newtonelectrical.com - Philippines leading electrical motor, generator and transformer repair and maintenance service provider.

EL-CID (Electro Magnetic Core Inspection Detection Test)

EL-CID (Electro Magnetic Core Inspection Detection Test)

A portable test equipment for inspection of rotating electric machine stator cores.

The Electromagnetic Core Imperfection Detector or EL CID, was designed and used to detect insulation failures between laminations of stator cores in generators. We have been using this equipment to test large Generator and High Voltage motors of all sizes.

It has the advantage that it does not require a large energy source to test the largest machines, it requires only 4% of a machines rated flux using a toroidal winding of a few turns. A 3kva supply at 110volt is sufficient to excite a machine of several hundred MVA.

Read more of this kind of Electrical Motor Testing and Maintenance at NewtonElectrical.com

Power Factor & Dissipation Test

Power Factor & Dissipation Test

 This is an AC test used to measure the bulk quality of the ground-wall insulation by measuring the dielectric loss per unit of volume of the insulation. A very important test for large motor reconditioning.

Tan delta testing - also called power factor testing (power factor is the same as tan delta within the low power factor ranges of practical electrical equipment).

As power is defined as the rate of energy transfer, 'power dissipation' is a measure of the rate at which energy is dissipated, or lost, from an electrical system. When an electric current does work on a conductor, the internal energy of that conductor increases, causing its temperature to rise above the ambient (surrounding) temperature. This causes energy to dissipate away from the conductor into the surroundings, through the process of heat transfer. The rate of this heat transfer (joules per second) is termed 'power dissipation' (in watts).

40kV Surge Testing

40kV Surge Testing

This test uses extremely short high voltage pulses to test electric windings and their insulation. This surge creates a voltage difference between turns. The turn to turn insulation is tested for quality. Turn to turn insulation weakness, incipient faults and all windings problems and faults are immediately visible on the oscilloscope screen.

Why Perform Surge Testing?

Insulation deterioration is one of the first signs that a motor is going to fail electrically. Since secondary insulation is least able to sustain wear, shorting usually occurs here before the thicker, ground wall insulation is affected. Surge testing is a non-destructive test and detects the early stages of secondary insulation deterioration.

The cost of motor failure is measured by interruption of plant output as well as extent of repair or replacement. Surge testing greatly decreases both. It detects failure early enough so that motor repair or replacement can be scheduled during a normal shutdown rather than an emergency outage. In addition, damage to the motor is minimized.