Distribution transformer capacity sequence grade optimizing method
Distribution transformer capacity sequence grade optimizing method
 CN 101,741,097 B
 Filed: 12/29/2009
 Issued: 02/12/2014
 Est. Priority Date: 12/29/2009
 Status: Active Grant
First Claim
1. a distribution transformer capacity sequence grade optimizing method, is characterized in that:
 Under each Rate of average load of same load, close capacitance grade sequence is optimized, according to following formula, be optimized calculating;
${\mathrm{\β\mathrm{ik}=\frac{{S}_{n}}{{S}_{i}}times;{\mathrm{beta;\mathrm{nk},}}_{}}}_{}$K=1 wherein, 2,3 (1)
Chinese PRB Reexamination
Abstract
The invention provides a distribution transformer capacity sequence grade optimizing method, belonging to the power system distribution transformer field. Firstly grouping calculation is started at minimum capacity grade sequence according to rated capacity specified by related existing standards, the calculation is stopped until an obvious inflection point appears on transformer average comprehensive damage curve, the capacity grade at the inflection point is the optimal capacity grade with minimum average comprehensive damage of the capacity grade sequence group, then capacity grade sequence grouping is continued by taking the next capacity grade as an initial point, optimizing calculation is carried out sequentially according to the steps until the inflection point appears, and the optimal capacity grade with minimum average comprehensive damage of the group is selected. The process is repeated, and finally optimized new capacity grade sequence is formed. Initial investment cost of distribution transformer can be effectively reduced, thus being beneficial to storage and dispatching of emergency goods and materials and running goods and materials of power system, and operating cost is reduced and the overall size advantage is developed, thus being beneficial to standardization and normalization of major equipment of distribution power system.
2 Claims

1. a distribution transformer capacity sequence grade optimizing method, is characterized in that:

Under each Rate of average load of same load, close capacitance grade sequence is optimized, according to following formula, be optimized calculating; ${\mathrm{\β\mathrm{ik}=\frac{{S}_{n}}{{S}_{i}}times;{\mathrm{beta;\mathrm{nk},}}_{}}}_{}$ K=1 wherein, 2,3 (1)


2. the method for claim 1, is characterized in that the method for claim 1 to be refined as following steps:

(1) the rated capacity grade of described existing standard defined is divided into groups from low to high, take 4～
6 capacitance grades as one group, first determine first group, take lowest capacity grade as reference capacity grade, can calculate the payload under its different loads rate, wherein S according to (3) formula _{n}for selected reference capacity in grouping;
β
_{nk}for distribution transformer capacity is reference capacity S _{n}time load factor, k=1,2,3 S _{sjnk}for the actual load size under reference capacity grade different loads rate;
S _{sjnk}＝
β
_{nk}S _{n} （
3）
(2) according to (4) formula, calculate composite loss and the mean value thereof under different loads rate under reference capacity;

Specification(s)