Requirements For The Selection Of Cable Core Wire Cross Section

(2) For accurate performance, it is crucial that the current loop of the transformer is functioning at an optimum level. In instances where a reliable basis is unavailable, the maximum short-circuit current can be determined by assessing the current capacity of the circuit breaker. The accuracy of the current transformer is imperative for ensuring safe and efficient circuit operations.

In a voltage circuit, it is important to ensure that all protection devices and safety automatic devices function properly. This is particularly crucial when the load on the voltage transformer is at its maximum. One of the key parameters to consider in this scenario is the voltage drop of the cable connecting the voltage transformer to the protection and automatic device screen.

To maintain a reliable power supply, the voltage drop across the cable should not exceed 3% of the rated voltage. This ensures that the voltage delivered to the protection and automatic device screen remains within an acceptable range. Exceeding this limit can lead to voltage fluctuations and potential malfunctions in the connected equipment.

Therefore, careful design and precise calculations are necessary to determine the appropriate cable size and length to minimize voltage drop. By adhering to the 3% threshold, the voltage circuit can effectively deliver the required power while ensuring the safety and proper functioning of all connected devices.

An important requirement for the operating circuit is that the voltage drop between the busbar and the equipment should not go beyond 10% of the rated voltage, especially when the circuit is operating at maximum load. Adhering to this limitation ensures that the voltage supplied to the equipment remains within an acceptable range.