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Acceptance and Maintenance Testing


Transformers are a fundamental part of any electrical system. Transformers allow us to generate, distribute, and utilize power at many different voltages. Power is typically generated at low to medium voltages. It is the transformed utilizing a generator step up transformer(GSU) to a much higher transmission voltage. This transmission voltage allows for sending the power great distances with lower losses than if the generation voltage had been used. At the utility delivery point power is again transformer to a distibution voltage using a power transformer. Power is then distributed to the end user at this voltage at the user site the voltage is typically again transformed to the voltage requirement of the client. This transformer may be a pole, padmount, dry, cast coil, or unit substation type. As you can see even in the simplest scenario transformers are found throughout our electrical power systems so it is important to understand how to commision, trend and maintain transformers in order to reduce hazard to life and property resulting from the failure or malfunction of the transformers in our system.

Acceptance testing and commissioning of new or recently moved transformers is incredibly critical. There are so many factors that can go wrong in the transport ans installation of a transformer all of which can be detected through thourough acceptance testing and commissioning. Many standards have been published on the subject of acceptance testing at AMP we abide by the International Electrical Testing Association and the American National Standards Institute’s NETA/ANSI 2009 ATS Standard for acceptance testing specifications.Other useful references may be Institute of Electrical and Electronics Engineers(IEEE), National Fire Protection Agency’s NFPA 70B,Internation Electrotechnical Commission.

Circuit Breakers

Circuit breakers provide a means with which to turn on and off the power in an electrical system while providing over-current protection. What sets circuit breakers apart from switches and fuses is that they have the ability to be reset, controlled remotely, and have logic functions as part of there operation. Switches open and close and can even be equiped to be operated remotely but in themselves do not have the ability to provide overcurrent protection. Fuses provide overcurrent protection and the combination of a switch and a fuse can give open and close capabilities but the combination would still lack the ability to reset and continue to provide power and protection. These features make circuit breaker great candidates for anywhere in your system that may see frequent faults, the need for immediate power restoration is important, or where logical input are desire for different states of the power. Circuit breakers range in complexity from a simple thermo-magnetic trip function that uses the heat produced by the current flowing through the breaker to instigate a trip to micro processor controlled protective devices with almost infinite adjustability and configurations. More about protective devices later, but suffice to say if you can imagine it modern microprocessor protective devices make it possible. Low voltage circuit breakers typically have their protective trip devices built into the frame or chassis of the breaker, designed and installed together from the factory. Medium and High Voltage circuit breakers are dependant on external or cabinet mounted protective relays to instigate their trips. These devices can be specified as part of the breaker from the factory or part of a much larger substation protective scheme that includes differential, and distance feeder protection.


Stand-by Generators

Standby generators are a staple wherever there are critical systems that rely on a constant supply of electricity. These generators are an important power source in a temporary outage or emergency, and as such, regular maintenance is required. Breakdowns also happen, and that’s why it’s so important to have a trustworthy contractor who can maintain, repair, and offer advice on the different types of generators.

Our knowledgeable technicians are skilled in the repair and maintenance of these versatile machines, as well as being able to set them up to the required systems and advise their owners on their operation and upkeep. Equally important to an emergency power system is the transfer means. Whether it is paralleling gear, peak shaving controls, or synchronization relays our technicians can maintain and test your equipment to ensure it will be available and operate when is should as it should.


Generators have one thing in common they rely on some means of mechanical power to convert into electrical energy that can be used by your electrical system. Routine maintenance on this prime mover is critical for the proper operation of a generator system to provide power reliably.


This is the device that actually outputs electrical power to your system when spun by the prime mover. Generators have winding similar to those of an electric motor. As such they are treated from an electrical maintenance standpoint as you would your critical electrical motors. Resistance measurements should be taken across bolted connections. Insulation resistance tests should be performed in accordance with ANSI/ IEEE Standard 43.


Transfer switches change the electrical path from normal (utility power) to emergency (generator power). It is easy to see how important this device would be during an emergency. The International Electrical Testing Association ANSI/NETA MTS-2011 Standard for Maintenance Testing Specifications for Electrical Power Equipment and Systems recommends visual and mechanical inspections as well electrical tests. The electrical tests should be at minimum: contact resistance across each switchblade assembly; insulation resistance tests for one minute on each pole, phase-to-phase and phase-to-ground with the switch closed and across each open pole; and dielectric withstand test.

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304 Turney Ridge Rd
Somerville, AL 35670