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| Oil filled pad mounted transformer |
Oil-immersed table-mounted transformers are one of the most important devices in the power supply and distribution systems of industrial and mining enterprises and civil buildings.
The main features of oil-immersed bench-mounted transformers (also known as oil-immersed power transformers) are reflected in their structural design and functional characteristics, as follows:
Structural Design
The axially symmetrical octagonal casing optimizes space layout and is suitable for dual-high-voltage output scenarios.k
Functional Characteristics
Maintenance and Cost-Effectiveness
Maintenance costs are low, maintenance techniques are sophisticated (such as oil chromatography and insulation resistance testing), and a comprehensive fault diagnosis system is available
Low cost of use
For the same capacity, oil-immersed transformers cost 30% to 50% less than dry-type transformers, making them particularly suitable for large-capacity applications.
However, most electrical power installations have the secondary side of the transformer grounded to the same ground as the primary source. Solidly connecting the secondary to ground ensures that primary and secondary grounds are the same point on the load side. Neutral grounding returns common-mode translents and impulses back to the primary source without theneed fornlecrostaticsheldhecommongroundnot thelctrostaic shield,prevents common-mode noise at the secondary.
Misunderstanding the difference between these applications has fostered a fairly large market for electrostatic shielded electrical distribution transformers, even prompting some manufacturers to offer shielding in virtually their entire transformer product line as avalue-added" feature.
However, test data has shown that this shielding is not only of very little value in protecting loads,but canpossibly promote transferof transentsand disturbances to the load. In other words, shields may not only be of doubful value in protecting loads, but can actually cause problems.
Common-mode (line-to-ground) testing is similar to filter testing. Unlike fiter tests,however,the load impedance is not specified by standards.The relationship between Ce (effective coupling capacitance) and Cg (ground capacitance) determines signal attenuation. Load type and impedance are not standardized, so any attenualion value is obtainable by varying Cg. Performance claims vary from -50 dB to -152 dB.
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