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New Generation
Electronic Thyristor Controlled
pf Corrector Systems

Improved operating efficiency is crucial and topical subject around the world. Reduction of energy costs is regarded worldwide as one of the crucial challenges to all branches of the industry. Reactive energy is chiefly regarded as one of the causes for the consumption of unusable energy and that is why reducing reactive energy usage has traditionally been one of the simplest ways to conserve energy.Today, Conventional Compensation Systems are the most common solution providers to eliminate the reactive energy. However, Conventional Compensation Systems kick in within 5 to 10 seconds when there is a need for reactive energy correction. Such a long time interval causes overloading and significant losses on the network. Considering the sum of all losses caused by hundreds and thousands of end users, the amount of total loss reaches to intolerable levels to electrical distribution companies. This is why it has become a common practice for them to confine the end users in their reactive energy consumption and even reflecting the fines on their electrical bills for their excess usage of reactive energy. Conventional Compensation Systems take the current in one phase to correct other two phases. At unbalanced loads it causes capacitive penalty when the current is high and also insufficient compensation when the current is low.
Since current compensation systems make correction by activating / deactivating capacitor blocks with contactors, they cause voltage transients, arcs, spikes and electrical noises during switching. The clear-cut difference between contactor-controlled and thyristor controlled systems is shown in the oscilloscope screen shots 1 and 2. When this situation is extrapolated for all industrial users, the corollary is that the mains get congested and it can give drastic damage to critical loads. This uncontrolled switching at capacitor blocks can even cause short circuit, contactor switches getting
fused, and even fires. This is why hundreds of contactor switches and capacitor blocks are replaced each year.

Screen Shot 1: Capacitor Activation with Contactor

Screen Shot 2: Capacitor Activation with Thyristor

With Karmet Electronic Compensation Systems ( EKM) , switching is made through 5 thyristor - diode modules positioned at 5 arms with binary logic, which means 32-step capacitive correction. At each arm, also harmonic filters, connected serial to capacitors are used, which not only limits the current going to capacitors but also suppress the system harmonics perfectly. The performance of this new generation systems during its operation with the line is recorded to Fluke 435 Analyzer ( Table 1 and Table 2) . Unbalances or distortions are eliminated by the separate correction of each phase.

Comparision Mechanical Compensation
• Each phase controlled independently
enabling the device to handle
unbalanced loads at optimum level.
• Increased capacitor life with zero
current switching.
• 32 step capacitive and 2 step inductive sensitivity correctio
• Semiconductor switching increases
reliability.
• Periodic test of capacitors and
semiconductors gives prior failure detection.
• Modular construction and easy
service.
• Remote communication supervision
and monitoring.
• Easy construction with standard current transformer.
• Energy saving with unbalanced loads.
• Solves current harmonics with harmonic filters.
• No current peaks, no dangerous transients and line pollution.
• Series inductors for damping PFC capacitors.
* Assumed installed power, Cosø : 0.8 inductive and Cosø : 0.9 capacitive

for detail information please call us.'
mobile : 021 33445179 or 08388153616