High Voltage Power Capacitors Fields of Application
INDIVIDUAL POWER FACTOR CORRECTION
The power factor correction capacitor is connected directly to the terminals of the consumer and will be switched together with it.
Advantages of individual capacitors at the load:
• Complete control; capacitors cannot cause problems on the line during light load conditions
• No need for separate switching; motor always operates with capacitor
• Improved motor performance due to more efficient power use and reduced voltage drops
• Motors and capacitors can be easily relocated together
• Easier to select the right capacitor for the load
• Reduced line losses
• Increased system capacity
INDIVIDUAL POWER FACTOR CORRECTION of 3-PHASE MOTORS
The motor and the capacitor are connected in parallel. They are both switched in and out by means of one and the same switchgear and also monitored by a common protective device. A discharge device is not required, because discharging takes place through the motor windings.
INDIVIDUAL POWER FACTOR CORRECTION of POWER TRANSFORMERS
The direct connection of the capacitor to a power transformer, which is jointly switched in and out, is feasible and permissible both at the H.V. side and the L.V. side.
In cases where harmonics exist in the line, the line should be checked to determine whether the capacitors and the power transformer are connected in series and create a resonance.
Care should be taken not to overcompensate the power
transformer during low load operation in order to avoid an
unacceptable rise in voltage.
Advantages of bank installations at the feeder or substation:
• Lower cost per kVAR
• Total plant power factor improved—reduces or eliminates all forms of kVAR charges
• Automatic switching ensures exact amount of power factor correction, eliminates over-capacitance and resulting overvoltages
INDIVIDUAL POWER FACTOR CORRECTION of WELDING MACHINES
The output of capacitors for welding transformers and resistance welding machines only needs to be in the range of 30% to 50% of the nominal transformer capacity. For welding rectifiers, a capacitor output of about 10% of the nominal capacity of the transformer/rectifier is sufficient.
ZDDQ Scope
LV power factor correction
NO.25,JINHE RD,HUAIYUAN ECONOMIC DEVELOPMENT ZONE ,BENGBU,ANHUI
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