What are the technical parameters of dry-type transformers?What are their respective functions?1

Technical requirements for dry-type transformers

(1) Dry-type transformer body: 

The high-voltage winding is made of copper wire and the low-voltage winding is made of copper foil.The coil is made of

 imported epoxy resin glass fiber in full vacuum, with strong rigidity and mechanical strength, and good short-circuit resistance.  The ampere-turns of 

the high-voltage and low-voltage coils should be balanced.The epoxy resin glass fiber mixture has the same thermal expansion coefficient as copper conductors, 

ensuring that the coil does not crack.It has strong heat dissipation performance.It is equipped with a temperature display control system that automatically 

displays the temperature of the transformer's three-phase winding. When the temperature limit is reached, the thermostat can automatically send a signal 

to control the fan start and stop, overtemperature alarm and action protection, and provide two passive contacts for automatically opening the substation 

exhaust fan.

The iron core and all exposed metal parts should be subjected to rust prevention treatment.The nameplate is made of stainless steel, and the important data

related to the transformer are marked on the nameplate according to national standards.The assembled shell is assembled on site, and the shell material is 

made of stainless steel plate.It has a communication 485 interface, which can relay the operating status of the transformer.

(2) The dry-type transformer can operate with 100% load under the condition that the fan is not running without overheating;it is allowed to operate with 

50% overload under the condition that the fan is running normally, without overheating, alarming, or tripping.

(3) Dry-type transformer no-load loss: 

The no-load loss is manufactured according to the national standard with negative error, not positive error, and must comply with the latest implementation 

standards of Shandong Electric Power Company.

(4) Noise index: 

The 2000KVA transformer is lower than 52ab when the normal operation fan is not running.

(5) Creepage distance: 

Organic material not less than 20mmKV, porcelain not less than 18mm/KVo20, high-voltage side phase-to-ground and phase-to-phase net air safety 

clearance (live parts) 2125mmo.

(6) The high-voltage incoming line is a cable, which meets the needs of upper or lower incoming lines;the low-voltage outgoing line is a bus duct, which 

is an upper outgoing line.

(7) The cabinet should be equipped with access doors and inspection windows at the front and rear to facilitate inspection of the joints in various parts.

(8) Equipped with temperature measurement device and temperature control box;the micro switch in the control box adopts the manufacturer's accurate 

24V power supply.  All components should use the reinforced insulation type products certified by the "Two Departments".

(9) The terminal (10cm) of the hanging ground wire shall be left at a suitable position, and the rest shall be painted with corresponding phase color paint.

(10) Under normal working conditions and load conditions, the transformer has a service life of 230 years.

(11) Other contents not mentioned shall be implemented according to GB6450-86.

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