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Kurbanov A. assistant
Jizzakh Polytechnic Institute Uzbekistan
CALCULATION OF THE NUMBER AND CAPACITY OF
TRANSFORMERS
Annotation. This article analyzes the number and power of transformers installed in order to reduce the wastage of electricity and improve efficiency in the case ofproduction enterprises' need for electricity.
Key words: load factor, transformer substation, full power.
Correct selection of the number and capacities of power transformers in BPP and workshop substations from a technical and economic point of view is of great importance in creating a rational power supply system of the enterprise. Technical indicators include the reliability of the power supply circuit, ease of operation, long-term operation of the equipment, level of automation, etc. Economic indicators mainly include initial capital and annual expenses. When choosing the number and capacities of power transformers for the enterprise, two or more options are analyzed and the most favorable is selected.
Industry of enterprises electricity supply BPP and workshop transformers in the creation the number and power choose big important have That's right selected transformer the number and power electricity energy of supply continuity provides [1].
Transformers the number when being selected the first in line their electricity supply reliability according to to categories to separate attention is given In this case, consumers of the 1st and 2nd categories two transformer from the substation, 3rd category consumers one transformer from the substation were provided [2-5].
Transformers to consumers installation too to the category looking done is increased. If one transformer substation using one how many consumers group being provided if, the first in line transformer 1st and 2nd category consumers is located to sex is installed.
Transformers power choose the following two method according to done is increased [6-10]:
1. Load factor method. This method according to transformer power in choosing loading of the coefficient categories in the section permission done the following to the values looking is determined.
Loading of the coefficient categories in the section permission done values
[11]:
Category I - from 0.6 to 0.7;
II category - from 0.7 to 0.75. Some in cases up to 0.85;
Category III - from 0.85 to 0.95.
Transformer of the substation loading coefficient the following expression using is defined [12]:
V
TT _ ^ ist
" ~ n • St,.
this here:
S ist - transformer being installed consumers is located have sex full capacity, kVA;
n - electricity supply reliability according to to be installed transformers number (1- and 2-category consumers for n=2, category 3 consumers to n=1 for equal);
S tr - to sex installation planned transformer capacity, kVA.
In general when normal operation of transformers in the situation loading should be 70-75 % need These are the requirements only when done transformer his passport information according to intended in term performance possible [13].
2. Normal and accident modes check method. This is the method according to of transformers power when selected, selected transformer power the following conditions perform should:
a) Normal work in the mode: nS tr >S ist
b) Accident the work in mode: 1.4 S tr >S ist
Accident mode expressed 1.4 accident mode during switch the transformer to 40% download possible characterizes. Transformer accident mode too download for transformer normal operation mode maximum 93% load with worked to be it is necessary Transformer too download one up to 6 hours a day permission it is done condition from 5 days not to exceed necessary [14].
Above see developed second method 2 and 3 categories to consumers have to the shops transformer while installing is used. Sex consumers electricity with 2 and 3 standard in provision powerful transformers choose to the goal is appropriate.
An example to TP as an example transformer the number and power is selected. of TP common capacity S TP =550 kVA ha equal to Electric supply reliability according to TP 2-category consumer is considered That's why for this to TP two transformer substation is selected. This is for TP 2 transformers with a capacity of 400 kVA is selected and loading to the coefficient is checked [15].
550
K = _ = 0,6875 2 * 400
Above account results based on analysis to do maybe loading the coefficient is 0.6875 equal, moreover this the result loading coefficient II-category calculated for, the loading was 68.75 % at the expense of transformer his own passport information according to intended more than the deadline work provides So it is branded 2x TM -400/10/0.4 for TP transformer is selected. Like
this account actions in execution future from electrical enginers professional activities considerate to be Demand will be done.
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