Static motor testing to support preventative maintenance programmes

Planned preventative maintenance (PPM)

We offer periodic offline testing and trending of the motor’s insulation systems to give an overall picture of motor insulation health. Static or offline testing is performed while the motor is not running and can be executed on site or in our electric motor repair facility. On-site testing is routinely implemented once or twice a year or during scheduled outages. Recommendations on how often tests are undertaken are based on a range of factors such as criticality, past history, size, repair costs, availability of spares, daily starts and stops, and ease of access, amongst others. We work with customers to agree the most effective schedule based on their needs and the associated risks.

A complete diagnosis of the insulation system offered includes winding resistance test, a meg-ohm test, a polarization test, a step-voltage or high potential test, and a surge test – all carried out using the Baker Tester. For higher voltage motors, 6kV and above, Partial Discharge testing can also be used to provide a wider picture of the machine health.

Partial Discharge

High voltage equipment often suffers from Partial Discharge activity, where localised corona or breakdown discharge can damage insulation, leading to progressive degradation and eventual insulation breakdown. This type of issue would not be detected using standard diagnostic tests and it is possible for a motor to appear healthy whilst having high levels of Partial Discharge. Compared with other dielectric tests, the differentiating character of Partial Discharge measurements allows localised weak and aged points of the insulation to be identified.

Partial Discharge testing and monitoring is particularly important when the medium or high voltage asset is critical to the operation of a network; this may be due to the asset’s age, past failures or the financial consequences of a failure.

PD measurements based on IEC 60034-27 standards can be performed on motors and generators either online during regular load service operation or offline.

All of the above tests are carried out in accordance with IEEE, IEC and EASA standard AR100-2105, which outlines recommended practices for the repair and therefore the testing of rotating electrical apparatus. Alternatively, testing can be carried out as requested by our customers, with a bespoke testing planned developed to meet individual requirements.

Houghton International can help

Dielectric testing is a low-impact rotating machinery asset management tool allowing our customers to make informed decisions based on a full picture of reliable data.

A combination of extensive knowledge, using calibrated, top of the range equipment and highly trained and competent engineers enables us to work in partnership with our customers in managing and extending the life of their electro mechanical rotating machinery.

Get in touch with our team today to discuss how Houghton International can support your ongoing electric motor maintenance activities and reduce the risk of unplanned machine failures.

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