For help with the unexpected, our response times set us apart. When a motor, generator fails or you need a transformer repair, you can count on ZGL for quick solutions thanks to expertise honed over decades working with the equipment’s. No matter how big or small the problem, we know that it’s always an emergency when critical equipment goes offline or trips an alarm, whether it’s from storm damage, part failure, or something more minor. In these situations, one call gets you a prompt attention from service personnel who will also have access to any parts you may need to get you back up and running.


Failure of transformer in power substation is not a sudden phenomenon, for that matter each and every failure will take place only after alerting through some pre-signs. If they went unnoticed or unattended will results into a failure. Therefore, it is wise on the part of the maintenance personnel to act upon the pre failure signs noticed well in advance to keep the transformer failure free and serviceable at all times.

If new transformer is installed for which there is no past experience, it will be difficult to forecast the defects and probable failures.

A transformer can fail due to combination of electrical, mechanical or thermal factors and it is always difficult to find out a particular mode of failure. Most of the transformers fails due failure of insulation. So the transformer may fail electrically due to failure of insulation which may be result from electrical, mechanical or thermal stress.

A quick onsite inspection of a failed transformer is done by our expert to collect the vital data Onsite inspection consists of examining the external conditions around the failed transformer and thorough examination of transformer.

& then diagnostic tests are conducted to find out fault and to give indication of repair. Test data are recorded carefully and several tests may be interpreted together to diagnose a problem. Samples of insulating oil for testing will be taken prior to opening the transformer for inspection.


Three phase induction motors are one of the most critical machines in processing plants or any manufacturing concern. They are used in situations where large power is required. Because of the critical roles these motors play in any plant, a failure of the motor, inability to start, noisy operation and sundry other problems need to be remedied as soon as possible to avoid costly production downtime.

Our expert spends a few minutes with the operator and get as much history as he can on the failed motor & Find out if anyone else recently attempted repairs or modifications. If so, what did they do and when? Sometimes an inexperienced person can unwittingly create additional problems while trying to help. Knowing what has already been done can shorten troubleshooting time.

Energized testing takes place while the equipment is under a simulated load to reveal problems that occur during operation. With the motor running, you can perform “dynamic testing” to identify issues with temperature, balance and distortion.

De-energized testing runs a motor through its paces while it’s turned off. This offline testing, often called “static testing,” looks at insulation resistance, wire damage and current leakage.

After completing all the working protocols our engineer recommends taking all point into observation that motor can be re-energized or it needs to be replaced.


Time is important when a generator system requires an on-site visit to attend to a system failure or an alarm warning, both to ensure that backup generators are ready to run if the primary power source goes off line and because the longer it takes to diagnose a fault, the more it costs Generator systems are complex combinations of many components working together.

Sometimes an issue is hard to isolate when it interfaces with many other components within the system. Ensuring a timely repair requires both an extensive knowledge of the complete system and the experience to quickly identify and troubleshoot the root cause of any failure or alarm condition.

A generator system is a complex combination of electrical and mechanical components that are subject to stress and wear. Electrical components are subject to arcing and heat. Equipment can also be subject to stress when left unattended and stationary for long periods. We know from years of experience the stresses that components in a system are subject to and have developed schedules to check or change certain items within the system before they fail. When service and testing schedules are followed, the incidence of unplanned system shutdown is very low. Should an unscheduled shutdown or lack of performance occur, it can usually be traced to sectors of the system that should have been identified during routine planned maintenance.

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