Transformer Installation Pdf
The cables you install must be kept as far away as possible from coils and top blades. If aluminum conductors are used, protect them as specified by the manufacturer. Some applications require a reduced sound level, such as a large unit in a commercial building with people working close to it. Lines and paragraphs break automatically. If appropriate, supports should be used so that the transformer enclosure is not crushed when the unit is lifted.
Installing transformers in existing structures may require an analysis of the building for structural support capability since the original structural information may not be available. Provide proper clearance for cable and avoid installing them near blades or coils. Before specifying any additional tests, you should contact the manufacturer to find out what data it has accumulated from testing essentially duplicate units. Some equipment could have a different torque requirement than shown. When considering the location of the electrical transformer installation, it is important to evaluate all safety codes.
Also, it's a matter of cost. Develop a procedure for inventory of all tools, hardware, and any other objects used in the inspection, assembly, and testing of the transformer. When changing taps, the same changes must be made for all phases.
Take care not to damage the base or tip it over. Ground, ground and don't forget to ground. You should arrange for an insulation resistance test to be carried out to make certain that no windings are grounded. The information presented here is not meant to supersede any manufacturer's instructions.
When viewing transformer product literature, you'll probably find that one manufacturer's units will have differences from that of a competing manufacturer. The transformer should be jacked evenly on all four corners to prevent warping or tipping over. When your transformer arrives on site, various procedures should be carried out to assure successful operation.
Such stress could cause a bushing to crack or a connection to fail. Therefore, it's advisable that you seek guidance on this matter from an engineer knowledgeable in seismic supports and the associated code requirements. Both the voltages and currents should change in a similar fashion. Whatever the choice, the cable insulation rating must be adequate for the installation.
After installation, you should check the output voltage of the transformer. When specifying a transformer to be operated in parallel with existing units, all these parameters should be discussed with the transformer manufacturer. If the electrical transformer is installed at ground level, secret of the nagas ebook pdf it is important to evaluate soil characteristics and soil behavior. Installation and commissioning.
Also, when aluminum conductors are used, give them a protective compound treatment at the terminal as specified by the cable manufacturer. Depending on the size of the unit and on the transport conditions, the transformer may be dispatched completely or partly assembled. An electrical transformer should be inspected for damage before installation.
Dry-type transformers have sound levels that are somewhat higher. If the unit is installed in a location it shares with other equipment such as motors, pumps, or compressors, the transformer hum will go unnoticed.
Doing so can overheat the connection. Also, you should arrange for a one-minute, V insulation resistance test of the control circuits. Usually, additional testing means there will be an increase in transformer cost. Often the location and the method in which a transformer is placed have much to do with the perceived sound as does the actual decibels generated.
These terminations should be attached to the cables as specified by the termination or cable manufacturer. Poor soil conditions can lead to differential settlements damaging your transformer or electrical connections. It's important that you have an understanding of the manufacturer's warranty. Do not install washers between the terminal lugs and the termination bus bar as this will introduce an added impedance and will cause heating and possible connection failure.
You should consider this when planning the unit's installation. These include the operation of fans, motors, thermal relays, and other auxiliary devices. These tips can be used for installation of both dry-type and liquid-filled transformers. If in doubt about clearances, do not hesitate to call the transformer manufacturer.
Installation and commissioning
Next, connect the load and energize the transformer. Regardless of manufacturer, you should carefully follow these instructions to ensure adequate safety to personnel and equipment. It is important to follow all safety precautions and provide safety equipment to the construction worker handling the transformer.
Web page addresses and e-mail addresses turn into links automatically. For new buildings, you should work with the structural engineers so that the transformer's placement is included in the building plans. The location should not expose the transformer to possible damage from cranes, trucks, or moving equipment.
After installation is complete, check the output voltage of the electrical transformer. These periodic mechanical movements create sound vibrations with a fundamental frequency of Hz and harmonics derivatives of this fundamental. Larger transformers have to be dispatched with bushings, a conservator and cooling equipment and all minor accessories have to be disassembled. Before applying any voltage to the transformer, you should make sure that the tank for wet-types, or the enclosure and core assembly for dry-types, is permanently and adequately grounded. If you have some doubt as to the load capability of the unit, contact the manufacturer.
When testing a transformer for sound level, you should recognize that all transformers, when energized, produce an audible noise. The installation of conductors should be performed only by personnel qualified and experienced in high-voltage equipment.
When planning the installation, you should select a location that complies with all safety codes yet does not interfere with the normal movement of personnel, equipment, and material. You may lift transformers with enclosures having lifting lugs by using appropriate slings or chains.
The insulation resistance test should be conducted immediately prior to energizing the transformer or the beginning of the dielectric test. Then, without connecting the load, energize the transformer. Before applying this voltage, check with the manufacturer's manuals.
Foundation preparation usually includes an evaluation of soil characteristics and concrete work. Mounting the unit on a platform that has less mass than the transformer will make the platform serve as a sounding board, just like the body of a violin. Should a transformer be built to meet special requirements, however, then some additional testing is recommended to ensure that the unit operates as called for. Occasionally, the installation of some method of sound abatement will be called for.
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