No Load Voltage Of Oil Type Distribution Transformer

Oil type distribution transformer is an important power equipment. Its various functions can not be improved without various designs. Only with good design can the performance and role of oil immersed transformer be brought into greater play. What should be paid attention to in the design of oil immersed transformer.

1. Conductor material: the conductor of oil type distribution transformer winding is usually made of round copper wire and copper flat wire drawn from electrolytic copper or oxygen free copper rod (resistivity is about 1% ~ 1.5% lower) to make acetal enameled wire, paper clad wire, composite wire and transposition wire. Aluminum conductor has also been used, but it is rarely used now because of its high resistivity, poor mechanical strength and difficult welding.

2. Winding form:

Cylinder type (layer type): single layer, double layer, multi-layer cylinder type and segmented cylinder type. It is commonly used for medium and small high-voltage or low-voltage windings.

Spiral type: single, single half, double, double half, four and four half spiral type; It is commonly used for medium and large low-voltage windings.

Continuous type: commonly used for medium and large high-voltage and low-voltage windings.

Tangled type: commonly used for large high-voltage windings of 66kV and above.

Internal screen type: commonly used for large high voltage windings of 66kV and above.

4. Winding arrangement:

Double winding: high low arrangement. Three windings: the step-down oil immersed transformer is high medium low; The step-up oil immersed transformer is arranged in a high low medium arrangement.

Voltage ratio deviation:

The rated voltage ratio is the ratio of the rated voltage of one winding to the rated voltage of another winding with a lower or equal rated voltage.

The deviation of voltage ratio (transformation ratio or turn ratio) is the difference between the measured no-load voltage ratio of the product and the specified standard voltage ratio, which is often expressed as a percentage of the specified standard voltage ratio.

The above are the main points and main aspects of the design of common oil type distribution transformer. The design of oil immersed transformers should be accurate and scientific, so that the oil immersed transformers can be safe and the performance can be improved.