# Harmonic Restraint Power Capacitor

**Hence electrical equipment has to be.**

**Harmonic restraint power capacitor**.
The standard states that the capacitor may be continuously operated in the presence of harmonics provided 1 the total reactive power is not greater than 135 of its rated value 2 the current due to the fundamental and harmonic frequency components does not exceed 180 of rated rms value and 3 the rms value of the applied voltage is not.
Filter reactors shall be used in series with the power capacitors for cases where resonance is most likely to occur.
To limit the damage to power factor correction capacitors and harmonic filter systems caused by excessive harmonics.

AThe value of 115 for voltages and the value of 145 for reactive power are acceptable if the harmonic load is limited to 6 h during a 24 h period at a maximum ambient temperature of Tamb 35C 13. One method is to simply put a reactor in series with the capacitor to move the system resonance without actually tuning the capacitor to create a filter. When installing power factor correction capacitors you can estimate the resulting parallel resonant frequency or harmonic order by using the following equation.

2 seen from the node where the harmonic currents are injected exhibits a maximum anti-resonance in the vicinity of the 7th current harmonic. Quality Inspection for Harmonic Restraint Power Capacitor - N8 20 20 Low Voltage reactive power integrated intelligent power capacitor Reactive compensation capacitor swell N8 series intelligent capacitor module uses synchronous switch as switching element which integrates switching switch cylindrical capacitor and module into one. Put another way PF is the ratio of useful power to perform real work commonly termed active power to the power supplied by an electric utility commonly termed apparent power.

Also the combination of harmonics and capacitors in a system could lead to a more severe power quality condition called harmonic resonance which has the potential for extensive damage. In the presence of harmonic producing loads capacitors used for power factor correction can cause parallel or series resonance problems which tend to increase the total harmonic distortion THD of the voltage and current waveforms. The article mainly from a few key links of power system which are electric power capacitor power transformer electric motors relay protection to illustrate harmonic hazards and described harmonic treatment methods.

IEEE Standard 18-2002 Standard for Shunt Power Capacitors states that power capacitors must withstand a maxi-mum continuous rms overvoltage of 110 and an overcurrent of 180 based on the nameplate rating. Capacitor fuse blow. This arrangement will ensure the reduction of harmonic distortion and avoidance of seriesparallel resonance that can lead to Overloading of capacitors Overloading of transformer and transmission equipment.

Resonant condition usually result in high capacitor currents and fuse operation. Capacitor banks do not generate har-monics but they are elements that are highly sensitive to the presence of har-monics. Capacitors are receivers that can cause harmonic resonance ampli-fying the levels of harmonics in our in-stallations.