How to install the dry-type transformer
The Definition of a dry-type transformer
Dry-type transformer is widely used in local lighting, high-rise buildings, airports, wharf CNC machinery and equipment and other places. Simply put, dry transformer refers to the iron core and windings not impregnated in insulating oil transformer.
The cooling mode is divided into natural air cooling (AN) and forced air cooling (AF).In natural air cooling, the transformer can operate continuously for a long time at the rated capacity.When forced air cooling, the output capacity of the transformer can be increased by 50%.It is suitable for intermittent overload operation or emergency overload operation; the increasing load loss and impedance voltage should not cause long continuous overload operation.
Characteristics of a dry-type transformer
1. Temperature control system: the safe operation of the dry-type transformer and its service life largely depend on the safety and reliability of the transformer winding insulation.
2.Cooling mode: Dry-type transformer cooling mode is divided into natural air cooling (AN) and forced air cooling (AF).In natural air cooling, the transformer can operate continuously for a long time at the rated capacity.When forced air cooling, the output capacity of the transformer can be increased by 50%.It is suitable for intermittent overload operation or emergency overload operation; the increasing load loss and impedance voltage should not cause long continuous overload operation.
How to install the dry-type transformer
Dry-type transformer is an indispensable and important equipment in the power supply and distribution system. Controlling the key technical points of its installation and debugging will directly affect whether it can operate safely, reliably, stably and efficiently.Power builders should strengthen the research and discussion of the storage, transportation, installation and commissioning technology of dry transformer, and realize the precision and standardization of dry transformer in the actual operation and construction level by controlling the key technical points of the installation and commissioning of dry transformer.So as to play the advantages of dry transformer to improve the quality of power supply.
1.Dry-type transformer handling
In general, in order to ensure the quality of dry-type transformers, the overall transportation method is often used during transportation.Before transportation, the protection of the transformer should be done well, in the lifting, loading and unloading should be strictly according to the specifications, to ensure that the transformer is evenly stressed and smooth lifting, strictly prohibit the lifting gear rope compression to any parts of the transformer.In the process of transportation, the anti-freezing and rain prevention work must be done well, and the transformer must be firmly tied to the sleeper at the bottom of the packing box to avoid sliding displacement.To carefully plan the transportation route of the dry transformer, try to avoid the slope is greater than 15 degrees and rugged road.The transformer shall be kept dry and ventilated when parked during transportation.
2.Open-box inspection of dry-type transformer
Before the installation of the dry transformer, first of all, the transformer manufacturer, the employer, the installation unit related personnel to check the transformer, and strictly make inspection records, carefully verify the specifications, models, quantity and quality of the dry transformer main body and accessories.Comprehensively check the technical documents, model and specifications, qualification certificate and inspection report and other relevant documents of the dry-type transformer, and check whether it meets the design requirements.Secondly, check whether the main body of the dry transformer is damaged, whether the parts are displaced and damaged, and whether the electrical support parts or connecting lines are complete and firm.Finally, check whether the spare components are missing and damaged.If there is a problem in the inspection, it must be Must be able to timely and effectively.
3.Installation of dry-type transformer in place
Before the dry transformer installation in place, the first to check whether the level of dry transformer foundation groove steel, the horizontal installation specification, embedded steel plate below the empty drum phenomenon, to ensure that the basis of the dry transformer has good seismic and sound absorption, if the empty drum under the steel plate is not processed will make the dry transformer after operation noise increased sharply, is bound to affect the installation effect.Secondly, use the roller to move the dry transformer smoothly to the installation position, slowly withdraw the roller bar to avoid vibration of the dry transformer, and carefully and accurately install the dry transformer to the design position.Finally, at the four corners of the dry transformer base, Prevent the displacement of the dry-type transformer during the operation process.
4.Dry-type transformer wiring
The wiring work of the dry-type transformer is composed of three parts: the primary side connection of the introduced power supply line and the transformer, the secondary and low-voltage lead line connection, and the transformer grounding connection.When the high voltage side cable connecting the transformer is connected, the casing of the transformer shall not be directly stressed to avoid deformation or damage.When connecting the low voltage side of the large current bus to support separately, shall not directly press on the transformer terminal, causing too high mechanical tension and torque, when the bus current is greater than 1000A, the bus and the transformer terminal must be used between a soft bus connection, the main purpose is to compensate for the thermal expansion and cold contraction of the conductor stress And vibration between dry transformer and bus.Electrical connections at each junction must maintain the necessary contact pressure, and a spring washer shall be used.The torsion wrench shall be used when tightening the bolts to ensure the bolt torque meets the design requirements.The dry transformer is located on the base on the low voltage side and is equipped with a special grounding bolt.The grounding of the transformer and the metal housing must be reliably connected to the grounding system through the bolt.If the low-voltage side is in a three-phase four-wire system, the neutral point must also be reliably connected to the grounding system.
Supplier of dry-type transformers
Leading One-stop Power Distribution and Electrical Automation Solutions Manufacture
shunzhi Power Electric Equipment CoLtd.SHZPoweris a long-history high-tech enterprise dedicated to the scientific research, design and domestic and foreign trade of CNC glue dispensing machine,Multicolor Industrial Inkjet Printing Machine,electrical automationmedium and low voltage switch cabinets, box-type substations, power distribution cabinets, and multimedia boxes.If you are looking for dry type transformer or want to know more about us feel free to contact us.
