Introduction:
In a direct arc furnace, there are several parameters that play a crucial role in its operation. These parameters include current, voltage, and power factor. Among these, the current is considered to be of high value due to various reasons, which will be explained in detail below.

Explanation:

1. Current:
- In a direct arc furnace, current is the primary parameter that determines the amount of heat generated by the arc.
- The higher the current, the greater the heat generated, which is essential for melting and refining the materials in the furnace.
- The current also affects the melting rate and energy efficiency of the furnace. Higher current leads to faster melting and higher energy efficiency.
- Additionally, the current directly affects the electrode wear, and controlling it within the optimal range helps to minimize electrode consumption and prolong their lifespan.
- Therefore, maintaining and controlling the current in a direct arc furnace is crucial for its efficient operation and overall performance.

2. Voltage:
- While voltage is an important parameter in a direct arc furnace, it is not considered to be of high value compared to current.
- Voltage determines the arc length and stability in the furnace. Optimal voltage ensures a stable arc, which is necessary for efficient melting and refining.
- However, the voltage can be adjusted and controlled to maintain the desired arc length and stability. It does not directly affect the heat generation or energy efficiency as significantly as the current does.

3. Power Factor:
- Power factor is a measure of how effectively the current is being used in the system.
- In a direct arc furnace, power factor is important for determining the reactive power consumption and overall energy efficiency.
- While power factor optimization is important for minimizing energy losses and improving the power system's performance, it is not directly related to the value of the furnace in terms of its primary function of melting and refining.

Conclusion:
In a direct arc furnace, the current is considered to be of high value compared to voltage and power factor. It directly affects the heat generation, melting rate, energy efficiency, and electrode wear in the furnace. Controlling and maintaining the current within the optimal range is crucial for the efficient operation and performance of the furnace.