HARMONIC FILTRATION
SDC Industries offers a range of Harmonic Filters to suit industrial/commercial premises that have experienced interference on their electrical power system.
The company offers two types of Harmonic Filter:
Passive Harmonic Filter Bank detuned to a specific harmonic frequency
Active Harmonic Filter Bank programmed to provide harmonic filtration over a range of harmonic values.
PROBLEMS CAUSED BY HARMONICS:
There are a number of problems caused by harmonics on any electrical system:
IN A NETWORK
- Overheating of the neutral conductor leading to the risk of fire
- Increased power losses
- Strong electromagnetic fields
- Causes the network to produce interference
- Malfunctions in earth fault control
- Failure in remote control systems.
IN CAPACITORS
- Capacitors are especially sensitive to harmonics. Batteries must be over-dimensioned in order to withstand them.
- Increased power losses
- The risk of resonance
- Decreased operating life
- Higher dielectric capacitors required
HARMONICS ALSO CAUSE INTERFERENCE IN ELECTRICAL PLANTS
- In transformers
- Increased power losses
- The risk of resonance
- Overload of delta windings due to rotating harmonic current
- Decreased operating life
- Noise
- Temperature Rises.
- In computers
- The risk of malfunction. Harmonics may cause mysterious interference effects.
- In cables and conductors
- Increased power losses
- Overload on neutral conductor (N- and PEN-conductors)
- The risk of fire. The neutral conductor can burn out.
- Other Interference
- Malfunctions of electrical equipment
- Malfunctions of electronic relays
- Malfunctions of earth fault alarms
- Unrequested operation of appliances
- Malfunctions of control devices
- Strong electromagnetic fields
- Potential differences in 4-conductor systems
BENEFITS OF UTILISING HARMONIC FILTRATION:
INCREASED EFFICIENCY IN LOW VOLTAGE NETWORK
- Increased efficiency in low voltage network
- Reduction in transmission losses
- Increased loadability of the existing network and switchboards
- Lower temperature of cables, switchboards and transformers
- Reduction in 95% of harmonic current in neutral and phase conductor
ACTIVE HARMONIC FILTER
Each Active Filter features a versatile user interface, enabling the user to programme filtering characteristics,perfect multi-tuning to selected harmonics (including zero sequence). The system cannot be overloaded, and is also capable of being programmed for Power Factor Correction.
PASSIVE HARMONIC FILTER
Each assembly comes complete with 3-phase iron-cored reactors, developed for this application. All assemblies are fitted with stage-energised indication, and a multi-stage electronic microprocessor controller is usually fitted to ‘sense’ the system requirement for power factor correction capacitance.
MORE RELIABILITY
- Reduced temperature of network devices
- Increased maintenance intervals
- Longer lifetime of the network
INCREASED EFFICIENCY
- Less power or more load
- Less maintenance
- Longer lifespan of lamps and capacitors
REDUCED MAGNETIC FIELDS
The reduction of harmonic component of the current reduces the total magnetic field.