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Power Quality Solution |
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Active Harmonic Filter (LIEBERT AF3)
Generation Active Harmonic Filter. State-of-the-Art active filter, that dynamically cleans up Harmonics and improves Power Factor, for all types of electrical installations. It has dynamic control features and has no resonance effects, no reactive power circulation, no passive components.
FEATURES –
 32 bit, DSP control
Employs high speed IGBTs in power circuit
Closed loop active filter with source current sensing
High attenuation up to 96% of individual harmonics
Programmable selective harmonic elimination
PF compensation, leading as well as lagging Load balancing
PF can be programmed from 0.7 to unity
Selection between PF and harmonic compensation
Remote monitoring and diagnosis
Self current limiting, under overloading condition
Automatic current limit modification with respect to ambient temperature
Helps compliance to IEEE 519
IEC / EN 62040 - 2 category C3
User friendly PC interface
BENEFITS TO CUSTOMER-
Safe and reliable AC electrical distribution systems
Overloading and overheating of the neutral conductor cancelled
Nuisance tripping of protection circuit breakers avoided
Improved power quality
Reduction of the THD v
Cancellation of the voltage potential on the neutral conductor
Increased lifetime of AC distribution system equipment
Over-sizing cables, transformers and other AC distribution equipment avoided
Compliance of installations with harmonic standards ensured
Improved power factor
Lower energy expenses/bills |
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| AREAS OF USE |
| Due to the higher costs in direct comparison with passive filter solutions, active filters are mainly used in the following cases |
In systems in which no, or only limited, additional capacitor power may be installed (power factor close to 1)
Clearly defined harmonic level (THD-U) e.g. critical production with long process chains (chemical industry semiconductor production)
High neutral conductor currents (e.g. 3 harmonic)
Unsymmetrical load on networks
High dynamic of the harmonic distortion and reactive power
Highest harmonic distortion or weak grids |
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| TYPICAL AREAS OF APPLICATION |
Oil, gas and steel industry
Welding machines
Water treatment
USV systems, computer centres
Cement and automobile industry (computer and network connections)
Paper industry
Banks and data centre
Tooling machines, drive technology frequency converter, servo applications, DC drives, DC supplies)
Elevator industry, tunnel supplies (ventilation). |
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| AF3 - Next Generation Active Filter |
| Liebert AF3 latest technology to eliminate harmonic injected into the mains supply by non linear loads, as well supplies inductive power demanded by the load, so as to correct input power factor to near unity. |
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Current harmonic elimination is achieved by sensing load currentand extracting harmonic current signal. This and the reactive current signal, together are used to generate a reference for the controlled current source connected at the PCC(point of common connection) of source and load. This results in mains supplying only real power for the load and reactive and harmonics being sourced from the AF3.This is carried out dynamically,so that any change in the load pattern or its nature is immediately responded without any manual intervention.
In the following example first figure shows the recorded input current waveform of a six pulse thyristorised rectifier.
Bottom figure shows considerable improvement in the waveform due to AF3 connected in shunt.
One is with only harmonic correction and the other is with power factor and harmonic correction.
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| APFC Panel |
We are engaged in offering a quality range of APFC Panels. These products are acknowledged for their attributes such as sturdy construction, trouble-free operations, reliability and durability. In electrical power networks, ranging from the industrial electricity network through to office buildings,system perturbation occur when operating electrical and electronic loads. We refer to network perturbation when the original “clean” sine wave of the voltage or current changes. |
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| Dynamic APFC Panel |
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| Real Time Power Factor Corrector (RTPFC) |
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Dynamic PFC systems are particularly used in applications with rapid and high load changes. In such cases, conventional PFC systems are not fast enough to follow the load changes which means that these systems are either under compensated or overcompensated.
Electromechanical contactors are not suitable for these types offrequent switching cycles. If contactors or capacitor contactors are still used in such applications, the contactors are worn out very quickly and this can lead to significant safety risks for the whole system. Dynamic PFC systems avoid this problem with the help of semiconductors. Semiconductors gently connect thecapacitors to the network i.e. without network perturbations and capacitor stresses.
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