In-House Production

Harmonic Filter Resistors

Use of power electronics equipment (HVDC, SVC etc.) with technological developmentsand non-linear loads such as arc and induction ovens have caused to the harmonics ( magnitudes different than the network frequency) and have decreased the power quality.

This issue affects other linear loads which do not cause harmonics and causes overheating, insulation problems, short operating life and significant loss of efficiency. Harmonics do not result in any benefits but cause significant power losses at the network.

Passive harmonic filtration is the most efficient and cost-effective method to eliminate harmonics. The harmonic filter systems can in principle only consist of capacitor and reactor (LC). However, in this case, a change in the value of the capacitor or reactor due to manufacturing defect, aging or temperature can affect the filtering very seriously and may even cause the parallel resonance to increase even more harmonics. This sensitivity can be controlled by adding resistance to the filter circuit and the harmonic filter system can continue to work with the same efficiency for a long time.

For low-voltage systems, harmonic filtering with a capacitor and a reactor is a more optimal solution due to low risk. However, considering the risk of changing the capacitance of the capacitor and the damages that may occur due to this, in medium voltage and high voltage systems, using harmonic filter resistance is a more optimum solution.

Technical Specifications:
  • Suitable up to 36 kV rated voltage
  • Stainless steel resistance material suitable for extreme ambient conditions, resistant to oxidation and corrosion, low resistance variation against to temperature and low inductance
  • Special mechanical and electrical design to withstand high temperature and inrush current
  • Design and tests in accordance with IEC 60071-1 and CIGRË WG 14.30 Section 17 Resistors and other special specifications
  • Insulated from ground and suitable for the isolation level between the input terminal and the ground, between the output terminal and the ground and between the input and output terminals

Resistor Element:
  • Spring-wound, edge-wound or grid resistor elements with low inductance and a cross-section suitable for the nominal current
  • Fully-modular, bended and stainless steel bolt connections in order to ensure electrical continuity at high temperature
  • High conductivity for high current with bended and cascaded terminal connectors suitable for serial and/or parallel connections with high cross-section, low contact resistance
  • High internal insulation and high mechanical resistance against to shocks and sagging thanks to the use of large surface satiated bushings and M16 shear connectors
  • Special designed to dissipate the thermal and mechanical effects of overcurrent to the surface grid resistors

Enclosure:
  • Standard IP23 Protection Level suitable for outdoor usage and perfect cooling
  • Standard hot-dipped galvanized steel
  • Frame suitable for side by side (horizontal) or stacked (vertical) installation
  • Side or top entry or exit with bushings based on insulation level
  • Fully-modular, rigid, strong enclosure design with resistor blocks mounted to the frame for safety lifting from the upper or lower side
  • Easy access and maintenance to the resistor blocks on site thanks to blocks independently mounted to the frame
  • Corrosion-resistant handling rings and connectors
  • Stainless steel product and warning labels

Options:
  • Requested inductance limits
  • Stainless steel, aluminum enclosure
  • Painting enclosure in desired color code
  • Side or top entry or exit with bushings
  • Modular elevation legs suitable for extreme environmental conditions
  • Special design for high altitude

Visit the Filter Resistors category from Harmonic Filter Resistors page or go back to Products & Services page