There are many problems that can be avoided during installation simple transformer by installing the transformer in the right environment. Many difficulties and safety risks can be avoided or by certain factors in mind, while the positioning of a transformer can be minimized before it is installed and connected. Likewise, the site should have an impact on how the transformer should be created and what should be considered in the future.
The standards
InstallTransformers in accordance with the ANSI, NEMA and IEEE standards is critical for a safe electrical installation and a reliable power supply - especially for applications where power quality is an issue. Transformer installation is one of the most common, yet complicated installation practices, the cause of considerable confusion in the dimensioning Over Current Protection Device (OCPD) and bonding and grounding conductors.
Die Cast Enclosure
Many electrical installations, aChallenge in relation to the NEC requirements and transformers can raise this challenge to a new level. A well-designed installation will ensure the lines and equipment are correctly dimensioned, protected and also deal with the overarching theme of grounding. Incorrect installation can cause a fire, cause by improper or protective conductor sizes and electric shock due to inadequate grounding.
Diecast aluminum enclosure, type AN-1307 Review
Diecast aluminum enclosure, type AN-1307 Feature
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This article provides an overview of important aspects to keep in mind whileInstallation of transformers located outside and inside, and for dry vs. liquid-filled transformers.
Installation Best Practices Some of the most important transformer installation best practices are listed below:
. 1 Permanent Grounding: When the transformer is the time - before a further inspection and carried out before mounting the unit - The tank should be grounded permanently with the right size and properly installed permanentGround.
2. No access should rain or humidity, the transformer may be fluid-filled chamber in conditions of excessive moisture. If humidity is above 70%, for example, dry air should be pumped continuously into the gas chamber. Liquid-filled transformers, which must be sent with nitrogen in the gas chamber are purged by pumping dry air for at least 30 minutes before service personnel can enter the tank. Oxygen concentrations from 19.5% to 23.5% is recommended.
Third fluidInspection: If the insulating fluid for inspection must be pulled down, make sure equipment for the clean and dry storage of liquid during the inspection and filtering the liquid before filling the tank. It is very important that all connected devices in dealing with the fluid (hoses, pumps, etc.) are also very clean and dry. If this equipment was previously used is of a different kind of fluid, clean all contaminated objects. When removing the liquid, the levelshould not go below the top of the windings.
4. Pressurization liquid-filled transformers can be kept outdoors on delivery. Sufficient gas pressure must be maintained at a positive pressure of 1 bar to 2 bar permit at any time, even at low ambient temperature. The pressure-vacuum gauge, if provided with the transformer, will show variations in pressure with the ambient temperature. Pressure and ambient temperature readings should be recorded regularly. The manufacturerStatements must be designated for storage of accessories.
5. Inspection and fill the tank should have a final inspection of the transformer before it is excited, especially about all the work was done within if. All electrical connections should be checked for leaks. All connectors should be checked for tightness of the seals and pull out all the connections are checked. Electrical spaces inside the container to be checked. A final check should be made to ensureAll tools have been removed.
6. Charged After applying full voltage, the transformer should be downloaded is kept under observation during the first few hours after the operation. After a few days, you see the oil for the oxygen content and the dielectric strength. All temperatures and pressures should be in the transformer tank during the first week of operation be reviewed. Except for special design transformers can be used on its assessment kVA, when the average ambient temperature of the coolingAir do not exceed 86'F (30'C) in a 24-hour period and not the height exceeds 3300 ft.
7. If used Surge, Surge arresters must be installed and connected to the transformer bushings / terminals with the shortest possible leads. These traps may be necessary to protect the equipment from the line switching surges and lightning.
If the transformer is under vacuum, Never, Never ...
* Voltage at the transformer
* Do not leave it a positivePressure must be applied
* Stand or walk on the transformer tank
8. Structural Considerations Several transformers can be spread evenly mounted on a single pole as long as the weight, and the total weight is within the permissible limits of the bar, all the trusses or support bolts.
. 9 Assembly: Sub-100 kVA single phase distribution transformers are typically mounted to the secondary network on. Platform or pad mounting options are for transformerslarger than 100 kVA.
10. Protection: In addition to self-protected transformer types, all distribution transformers, lighting arrester and fused cutouts installed on the primary side.
. 11 Ground wires: Cover all the ground wire with plastic or wooden forms to a point 8 feet above the floor of the hive.
12. Guying the pole guy wires installed correctly can protect the equipment rack mounted line from damage caused by the stress of the line conductors and pole,fishing line and minimize damage caused by storms.
Below are some general precautions with the installation of foreign, interior to note, dry or liquid-filled transformers:
Outdoor Transformers
For transformers are held outdoors, some of the most important considerations, the public are safe - and keep the transformers safe from outside influences - are:
* Minimize the damage: Outdoor transformers should be arranged so that to minimize the damageof natural and human elements. For example, a transformer out of the way of anything that might fall on him or walk into it, as are the moving vehicles and cranes kept.
* Side Dishes:. The particular situation of an outdoor transformer has a certain influence on how the transformer housing should be built. It should have ventilation slots, for example, small enough that fingers, sticks and so on can not put in them.
* Soil considerations: Forparticularly heavy transformers should be a criterion of the soil. The soil should be firm enough to support the weight of the transformer without shifting. For example, large amounts of clay would not be desirable in the earth, compressed sound with heavy weights.
Indoor Transformers
Transformers were kept stable to keep other considerations in mind:
* Structural Integrity: It is good idea to keep a close be particularly heavy transformersColumns as possible, because that is where they are best supported.
* Ventilation: Transformers shall be ventilated properly to reduce the chance of overheating, its. Large transformers should not be installed against walls held, so that as much surface as possible exposed to the outside air. Also felt transformers in confined spaces should be enough space to ensure adequate ventilation shall be provided. It should be enough space and ventilation for theTransformer, so that its surroundings remain at room temperature.
* Noise. Locations, the walls are sound-absorbing materials on which is best, or especially loud transformers can be kept many people in areas without.
* Water: Excess water is harmful to both transformers to dry-and liquid-filled. If sources are to avoid water, then the transformer should be given protection against them, so that no water gets inside.
*Pollutants: The presence of airborne contaminants may be a problem for transformers. They should be required to be as much as possible, away from excessive dust or chemical pollution that could damage it.
* Contact: Transformers should be placed so that they easily accessible to anyone who may wait, test and repair.
Liquid filled transformers
There are some conditions that are specific to liquid-filled transformers. Thisare
* For fire hazards are liquid-filled transformers have, their location can hold up to the relevant specifications of fire.
* Security, keep in mind they should be positioned so that the possibility of leakage is no risk.
Dry transformers, on the other hand, overheat more easily than liquid-filled transformers and more vulnerable to air pollutants. For these reasons
* During the installation of dry type transformers, the ventilationmust be kept a priority. You should have easy access to clean, dry air, and there's enough space that the heat is able to be easily dissipate.
* The air is clean, free of dust and other pollutants. A site with filtered air can be optimal.
Although the search can appear after a suitable site for a transformer during installation to install secondary, right, the right location can ultimately reduce the costs bend and potential security risks. Keeping the Artof the transformer installed, its purpose and its surroundings is in the eye during the installation, a way to minimize future headaches.
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