1.unction and selection of transformer copper bar?

Transformers, everyone knows that. The transformer consists of an iron core (or magnetic core) and a coil. There are many types of transformers, according to phase number is divided into single-phase transformer, three-phase transformer, transformer according to cooling mode is divided into dry-type transformer, oil-immersed transformer; Transformers are divided into power transformers, instrument transformers, test transformers and special transformers according to their uses. The copper bar is a very small part of a transformer. Although the transformer copper bar is very small, but for the transformer, has the very important function. Without the copper bushing of the transformer, the transformer can not work properly. So what exactly is a transformer copper bar? Experts say the transformer copper bar is used on the transformer similar to copper foil copper.

2.What is the purpose of establishing specification for selection of Copper Busbar of transformer?

In order to reduce the unreasonable selection of copper bars, the mismatch between copper bars and components or the requirement of safety distance and dynamic thermal stability, and to facilitate production and construction, this design code is formulated.

3.Principle of selection for Copper Busbar of transformer?

(1) to meet the current requirements; 

(2 the transformer corresponding rated current in accordance with 1.1 overload coefficient; 

(3) to meet the safety distance, and components fit the head;

 (4) to meet the dynamic thermal stability.

4.Matters needing attention in selecting copper bar of transformer?

The selection of copper bars should not only consider the current carrying capacity, but also consider the maximum short-circuit current, that is to say, the size of the short-circuit current when a certain size of copper bars are selected and a short-circuit appears at the farthest place, thus matching the corresponding size of the protection (that is, the fuse or relay protection value size) .

5.Function and selection of transformer copper bar?

1. TRANSFORMER COPPER BAR FUNCTION:

Transformer copper bar is a kind of conductor with very low resistance, which is used as a conductor to supply high current. The copper bar is installed on the low side of the transformer to the receiving cabinet or to the power supply between the capacitor cabinet and the distribution cabinet.

2. CHOICE OF TRANSFORMER COPPER BAR:

(1) specification for connection of low-voltage disconnectors to copper bars (taking into account the capacity of the low-voltage main feed switch and the total capacity of the disconnector load, if both are small and a larger disconnector is still in use, appropriate adjustments may be made) :

(2) transformer low-voltage main bus selection provisions (except Customer Special Requirements) : In the selection of copper bar should also be based on the plate-type joints, inter-phase distance and other relevant dimensions for selection! Transformer below 50kVA can consider using cable, try not to use copper bar. 3 LOW VOLTAGE CIRCUIT BREAKER COPPER BAR SELECTION REGULATION: 1 Low Voltage Circuit Breaker Copper Bar Selection Table 1:

2 Low Voltage Circuit Breaker Copper Bar Selection Table 2:

3 LOW VOLTAGE CIRCUIT BREAKER COPPER BAR SELECTION TABLE 3:

4 Low Voltage Circuit Breaker Copper Bar Selection Table 4:

(2) specification for selection of copper bar in switchgear

(5)10 KV, 35 kv box transformer copper row selection reference table: 1 ISOLATION SWITCH SELECTION TABLE:

2 Circuit Breaker selector table:

Source: electric worry free

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