< script src = https: //opentype.js.org/dist/opentype.js> Electrical Design Manager




Low Voltage Distribution Transformer Calculator






Project ID:
Transformer ID:
Transformer Function:
Electrical Code:






tfr

LV Transformer Specifications

Distribution transformers are used to step down the electric energy supplied from the electric grid from medium voltage to low voltage level MV / LV. They are produced with 3 different technologies that include the conservator, hermetic and dry type. The used voltage levels range between 2kV up to 40.5Kv.

Although the transformer are widely used between 25kVA and 2.500kVA, it is also possible to produce higher and lower powers.

Transformers made of aluminum or copper conductor in line with the desired losses, expansion tank, and transformer type. Generally, ONAN cooling models are used, while models with fan are preferred for dry type transformers.

For more details on LV Transformers seeReference Library.

Note: The hashtag (#) symbol on a cell title indicates additional information is available, access it by clicking on the hashtag.



LV Transformer Selections and Calculations


Transformer Selection Table

Input Type Input Unit Output
Selected Transformer Type
Primary Voltage
Secondary Voltage
Impedance
Connection
Cooling (#)

Primary Calculated Load Tables:

(To Transfer To MV Process Equipment Schedule, Save the LV Transformer)

kWatts Amps kVA kVAr

Secondary Calculated Load Tables:

(Transfered From Panelboard Loads)

kWatts Amps kVA

Transformer Circuit Protection

(Primary Only)

Fuse Size Circuit Breaker
125% of Total Circuit Amps 125% of Total Circuit Amps