The high overload distribution transformer is a kind of distribution transformer developed to solve the short-term sharp increase of electricity load. The rapid growth of short-term power load means that most of the time in the year is in a state of light load, but there are ten days or half a month the load increases sharply, exceeding the rated load 1.5 times or even 2 times, and the load is concentrated in 2-3 hours, such as the Spring Festival load in the rural power grid, agricultural busy load and so on.
Product/performance characteristics
High overload distribution transformer is suitable for the special use of low annual average load rate, the Spring Festival and the agricultural busy period of the load for a short time to increase the load, under the premise of ensuring the basic power capacity, not only to meet the long-term demand for small load, but also take into account the short-term demand for overload power.
The high overload distribution transformer has the characteristics of energy saving, high efficiency, environmental protection, small no-load current, low reactive power loss, strong resistance to sudden short circuit and so on
High overload capacity
According to the load characteristics, the following overload requirements can be met without affecting the normal service life of the transformer.
1, 1.5 times rated capacity running for 6 hours;
2, 1.75 times rated capacity operation for 3 hours;
3, 2 times the rated capacity run for 1 hour.
High temperature resistance
Due to different insulation materials, high-overload distribution transformers are divided into two types: Class B insulation and class F insulation. The temperature resistance is shown in the following table:
For example, when the ambient temperature is 4□TC, the ultimate temperature resistance of the top layer oil is 80K+40K=120°C for a Class B insulated 200kVA overhauled transformer with the model S13-M □B□-200/1OGZ. And its raw materials, accessories, surface paint, seals and other components of the temperature resistance is greater than 120*€, according to the increase 30k is 150°C design.
Overload capacity/technical parameters
High overload variable capacity configuration table
|
Maximum load of the previous year |
The average annual growth rate of maximum load in recent three years |
||||||
|
Pma,(kW) |
<5% |
5-10% |
10-15% |
15-20% |
20-25% |
25-30% |
30% |
|
20 |
50 |
50 |
50 |
50 |
100 |
100 |
100 |
|
30 |
50 |
50 |
50 |
100 |
100 |
100 |
100 |
|
40 |
100 |
100 |
100 |
100 |
100 |
200 |
200 |
|
60 |
100 |
100 |
100 |
200 |
200 |
200 |
200 |
|
80 H0 |
|
|
100 |
200 |
200 |
200 |
|
|
100 |
200 |
200 |
200 |
200 |
200 |
200 |
|
|
120 |
200 |
200 |
200 |
200 |
200 |
|
|
|
140 <160 |
200 |
200 |
200 |
200 |
|
|
|
|
160 |
200 |
200 |
200 |
|
|
||



