(1), building requirements of multi-storey or high-rise main building substation, transformer can generally use epoxy resin casting type copper core winding dry-type transformer and temperature monitoring and alarm devices. In the dusty or corrosive gases seriously affect the safe operation of the transformer place, should be used to dust-proof or corrosion-resistant transformer. Particularly humid environment should not set up impregnated insulation dry-type transformer.
Set in the second floor above the three-phase transformer, should consider the vertical and horizontal transportation on the channel and floor loading, such as the use of dry-type transformer, its capacity should not be greater than 630kVA. residential district substation within a single transformer capacity should not be greater than 630kVA.
(2), within the set of fuel-immersed power transformer should be installed in a separate cubicle. Transformer high-voltage side interval on both sides should be installed removable guardrail.
Transformer and low-voltage distribution room as well as between the transformer room should be provided with access to solid doors. If the wooden door should be wrapped in iron on the transformer side. Transformer base should be fixed clamps and other anti-vibration measures.
Transformer noise level should be strictly controlled, if necessary, can be used to add noise reduction pads and other measures to meet the national environmental noise health standards, the relevant living and working room during the day ≤ 45dB (A), night ≤ 35dB (A).
(3), voltage regulation when the user system has the requirement of voltage regulation, should be used on-load automatic voltage regulator power transformer. For the new power substation is recommended to use on-load automatic voltage regulator transformer, is conducive to the economics of network operation. Although the temporary investment is slightly higher, but in a short period of time can recover the additional investment. When the requirements of three voltage substations, and through the main transformer coils on all sides of the power to the transformer capacity of more than 15%, the main transformer should be used three-coil transformer. Such as 220kV, 110kV, 35kV, usually use three winding transformer. (4), when the following circumstances can be set up special transformers: when power and lighting with *** with transformers seriously affect the quality of lighting and bulb life, can be set up special transformers. When the seasonal load capacity is large (such as large civil buildings in the air-conditioning freezers and other loads), can be set up special transformers.Wiring for Y,yno transformer, when the single-phase unbalanced load caused by the neutral current exceeds 25% of the rated current of the transformer low-voltage winding, it is appropriate to set up a single-phase transformer. Out of the functional needs of some special equipment (such as larger capacity X-ray machine, etc.) is appropriate to set up a special transformer.
Extended information
When using dry-type transformer, should be equipped with winding thermal protection device, its main functions should include: temperature sensor disconnection alarm, start and stop the fan, over-temperature alarm/trip, three-phase winding temperature tour detection maximum value display.
Energy-saving transformer should be selected, the overload should be considered for the accident overload capacity of the transformer, if necessary, forced air-cooling measures can be taken. When it is necessary to improve the value of single-phase short-circuit current or need to limit the third harmonic content or three-phase unbalanced load exceeds more than 15% of the rated capacity of each phase of the transformer, it is appropriate to choose the wiring for the D, Yn11-type transformer.
The use of non-combustible oil transformer, can be set in a separate room or close to the low-voltage side of the distribution device, but should be prevented from personal contact measures. Non-oil transformer should have not less than IP2X protection shell level.
Indoor installation of fuel-immersed power transformers should be installed in a separate cubicle. Transformer high-voltage side (including the lead-in cable) on both sides of the interval should be installed removable guardrail.
Transformer and low-voltage distribution room and transformer room should be provided with access to the physical door. If the use of wooden doors should be wrapped in the transformer side of the iron. Transformer base should be equipped with fixed clamps and other anti-vibration measures.
Transformer noise level should be strictly controlled, if necessary, can be used to add noise reduction pads and other measures to meet the national environmental noise health standards (related to the living and working room), daytime ≤ 45dB (A), night ≤ 35dB (A).
Baidu Encyclopedia-Main Transformer