Static Var Generator Panel,Active Power Line Conditioner

Total Harmonic Distortion, THD

The square root of the sum of squares of all individual har- monic distortions (voltages or currents) is called the Total Harmonic Distortion (THD).
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Distortion factor

The ratio of the rms value of the harmonic content to the rms value of the fundamental quantity, expressed as a percentage of the fundamental frequency. (IEV 131-03-04 modified) DF = (sum of the squares of rms values of the harmonics)1/2 / rms value of the fundamental frequency x 100%
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Displacement factor

The ratio of the active power of the fundamental wave to the apparent power of the fundamental wave. (IEV 131-03-21 modified)
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Double-tuned filter

Filter configuration with two tuning frequencies, mainly used in HVDC filter systems.
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C-type filter

High-pass filter modified with an extra capacitor to short- circuit the resistor for the fundamental frequency. Alternative when a damped filter is needed for a low-tuned filter (normally n < 5).
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High-pass filter

A damped band-pass filter. A resistor is connected in parallel with the reactor in a band-pass filter, which creates damping on the parallel resonance.
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Band-pass filter

A reactor (inductance) connected in series with a capacitor (capacitance).
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Damped filter

A filter with low, predominantly resistive, impedance over a wide band of frequencies. (IEC 61642)
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Detuned filter

A filter with a tuning frequency more than 10% below the lowest harmonic frequency with considerable current/voltage amplitude. (IEC 61642)
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Tuned filter

A filter with a tuning frequency that differs by no more than 10% from the frequency that is to be filtered. (IEC 61642)
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Rated output

Rated output is the theoretical power of the bank/system generated at the rated voltage, expressed in Mvar. It is also referred as installed power.
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Maintenance of capacitor banks

Maintenance of a capacitor bank doesn’t require much time or energy. However it is important that regular inspections be carried out. This will help prevent early failure and pick up any fault. An inspection routine would include the following: 1.Check and clean filters 2.Ensure tightness of all electrical connections 3.Ensure all fuses are not damaged 4.Ensure all discharge resistors are operational 5.Ensure all contactors are operational 6.Remove all dust and deposit buildup 7.Tong test capacitor current
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