Generator Inspection | Linquip

Generator Inspection

Generator Inspection

Industrial power plants rely heavily on generators, which are built to last for decades with minimal maintenance. A 3-phase generator's stator, which is responsible for transforming the energy of the magnetic field into electricity, is one of the device's most pricey components. Deterioration in the generator's condition and the reliability of its core might be expected over time. In order to prevent unscheduled outages, it is important to do quantitative testing and routine inspections of the generator core. Linquip understands the importance of locating and contacting certified Generator Inspection Service Providers. We've compiled a comprehensive list of verified Generator Inspection Service Providers organized by geographic location to meet their needs. A generator is required to be examined 12 times each year, with testing intervals of not less than 20 days nor more than 40 days. In addition, the testing intervals cannot be fewer than 20 days nor more than 40 days. In addition, it is recommended that a generator receive maintenance from a qualified technician at least once a year, during which time the oil and filters should also be replaced. Linquip can aid you in locating a number of Generator Inspection Service Providers that can help you find suitable service providers according to your application and types of generator.

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Top Generators Inspection Service Providers

Top One Power Limited

Top One Power Limited

Hong Kong S.A.R.
Available Services:
Installation
Test
General Services
Inspection
Eternity Power Trading

Eternity Power Trading

South Africa
Available Services:
Installation
Inspection
Refurbishment
Maintenance
Supported OEMs:
PumpWorksSEW-EurodriveHiton Special ValveGardner Denver Industrials GroupMTU



Generator Inspection | Linquip

Generator Inspection (Reference: tpcgenerators.com)



What is Generator Inspection?

Industrial power plants rely heavily on generators, which are built to last for decades with minimal maintenance. A 3-phase generator's stator, which is responsible for transforming the energy of the magnetic field into electricity, is one of the device's most pricey components. Deterioration in the generator's condition and the reliability of its core might be expected over time. In order to prevent unscheduled outages, it is important to do quantitative testing and routine inspections of the generator core.

You can find various Generator Suppliers and Companies in Linquip that can completely cover your requirements. You are also encouraged to visit the List of Generator Distributors in Linquip. You are also highly encouraged to visit our Generator Services to inspect all requirements for your valve operation and maintenance.

At Linquip, you can also find other parts of a service required for a generator, such as Generator Troubleshooting, Generator Replacement, Generator Assembly, Generator Overhaul, and Generator Rewinds based on your demand.

Generator Inspection Checklist

Following a checklist is crucial for routinely checking and testing your backup generator. Regularly examining increases the likelihood that any issues will be identified and fixed before you need to use your generator. Your routine generator check may take place daily, twice weekly, or once weekly, depending on how important your generator is to operations.

1. Finish the ocular examination. Make sure the generator and cage are clean, dry, and free from any evident problems.

2. Test the carbon monoxide and smoke detectors in the area.

3. Check the pressure and fluid levels. This also applies to coolant and oil in addition to gasoline. Make sure that fuel is getting to your generator even if it is not kept in a tank but rather is delivered through existing infrastructure (like natural gas).

4. Make sure that your battery appears to be in good condition and is charged.

5. Check for leaks and improperly fitting contact points by visually inspecting the hoses, fittings, and connections.

6. Make a general check of the electrical wiring and components to look for issues like worn connections.

7. Check the automated transfer switch, then use it to run the generator through its paces. This may not always be carried out during generator inspections; instead, it may have a set timetable.

8. Any strange sounds, vibrations, or alarms that appear while the generator runs should be addressed.

9. After testing, set the genset to "Auto" rather than "Off" so that it will start on its own when there is a power loss.

10. Check the fire extinguisher, first aid kit, instructions, and maintenance log, among other items of external equipment.

Inspection Procedure of a Generator

The following are the most important inspection procedure of a generator:

  • Material Inspection
  • Construction
  • General Arrangement Check
  • Armature and Field Windings Resistance Test
  • Armature and Field Windings Insulation Resistance Test
  • High Voltage tests of Armature and Field Windings
  • Dynamic Balance Test
  • Open Circuit Saturation Curve Test
  • Three Phase Short Circuit Saturation Curve Test

Material Inspection

The raw materials inspection is the first real inspection task for the electric generator. The manufacturer's facilities often have original or certified copies of mill certifications of material. The third-party inspector checks these certifications for specifications compliance and, as necessary, drawing conformity.

Material Inspection of a Generator | Linquip

Material Inspection of a Generator (Reference: dekra.nl)



Construction

The maker of electric generators will begin production once the raw material inspection of the generators has been completed and the results have been satisfactory or any non-conformities have been resolved through corrective action. Based on the inspection and test plan (ITP) that has previously been agreed upon by the buyer and the electric generator manufacturer, the third party inspector examines the following components of the electric generator.

General Arrangement Check

The third-party inspector verifies that every layout, instrument, control, terminal box, etc., is properly rated, situated, and labeled. Inspection procedures are followed in line with authorized designs.

Armature and Field Windings Resistance Test

Before performing tests, the generator's armature and field windings are tested for resistance. To get the resistance values at a given temperature, the observed values must be rectified using the proper formula.

Armature and Field Windings Insulation Resistance Test

Before and after the dielectric test, the insulation resistance of the generator armature and field windings is tested. A 1000 V megger (for the stator winding) and 500 V megger are used to test each phase winding of the stator and rotor (for rotor winding). One minute after applying electricity, the insulating resistance is measured. If the measured values exceed the desired values, the test would be considered valid. At the same time, winding and ambient temperatures, as well as humidity, are recorded.

High Voltage Tests of Armature and Field Windings

Before and after a high voltage test, insulation resistance is determined. One by one, each phase winding is examined. During testing, the other two phase windings are grounded. When E is the rated voltage and the test lasts for 1.0 min, the test voltage would be 2E + 1000 (V). When each phase winding endures the required circumstances, the test will pass.

Dynamic Balance Test

After assembly is complete, a dynamic balancing test of the generator is performed. Each bearing shaft's vibration is measured over a specific speed range. The test is conducted at the rated gas pressure, and the results are considered valid if the measured value is below the required value. Additionally, the observed vibration value at the critical speed must be lower than the required value.

Dynamic Balance Test of a Generator | Linquip

Dynamic Balance Test of a Generator (Reference: fortum.com)



Open Circuit Saturation Curve Test

The test is conducted under operating conditions at the specified speed and gas pressure. Saturation curve readings are usually taken with only rising excitation up to 20% above voltage, followed by only decreasing excitation. At the rated voltage, voltage balance management is required, and the phase order is also examined. If the field current at the rated voltage is 1 + 0.1 times the specified amount, the test will pass.

Three Phase Short Circuit Saturation Curve Test

The test is conducted at the rated speed and gas pressure. It is customary to read the short circuit characteristic curve up to the rated current. At the rated current, the phase balance is examined. If the field current at the rated armature current is (1 + or - 0.1) × the specified value, the test is considered valid.

How Often Should Generators Be Inspected?

A generator is required to be examined 12 times each year, with testing intervals of not less than 20 days nor more than 40 days. In addition, the testing intervals cannot be fewer than 20 days nor more than 40 days. In addition, it is recommended that a generator receive maintenance from a qualified technician at least once a year, during which time the oil and filters should also be replaced.