Energy consumption pattern

The energy pattern given in below table is helpful in understanding the way energy is used in a foundry and helps to control energy cost by identifying areas where waste can occur and where scope for improvement may be possible. It is observed that melting consumes a major portion of total energy consumed.

An electrical arc furnace is the most widely used technological equipment within metallurgical industry. However, the arc furnace is characterized by the pronounced stochastic operation mode. The arc forming process in the arc furnace (which is accompanied by generation of reactive power, higher harmonics, emergence of asymmetry of currents into the power supply network) leads to reactive and active power's fluctuations.

Current harmonics are caused by non-linear loads. When a non-linear load connected to the system, it draws a current that is not necessarily sinusoidal. The current waveform can become quite complex. In power systems, harmonics are defined as positive integer multiples of the fundamental frequency. Thus, the third order harmonic is the third multiple of the fundamental frequency but third harmonic is less than the fifth harmonic.

An Active Harmonic Filter is an electronic power inverter using IGBT semiconductors with various control loops to increase Power Factor and reduce harmonics by injecting a dynamic cancellation signalinto the power line. The operation of an active filter is based on a continuous monitoring and conditioning of the distorted current created by the non-linear load. The same harmonic currents, but with a 180º phase shift are generated by the filter, so that harmonic components are cancelled and only fundamental component flows from the point of common coupling of the load.

ZDDQ Active Harmoinc Filter Series

400V Active Harmonic Filter

440V Active Harmoinc Filter

660V Active Harmonic Filter