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As a result of this kind of correction, circuit current can be brought more nearly in phase with the applied voltage and the power factor can approach 100 percent Capacitors can reduce the kilovar demand from the point of demand back to the generators The installation of capacitors can increase generator and substation capability for additional load at least 30 percent, and can increase individual circuit capability in terms of voltage regulation from 30 to 100 percent In actual power systems, full correction to achieve 100 percent power factor is usually not attempted If a system had a constant 24-hr load at an established power factor, this correction would be possible and even reasonable, but changing load conditions typically rule that out that possibility The addition of a preset number of capacitors to cancel out the inductive (lagging) kvar would lead to changes between a surplus of leading capacitive kvar at certain periods during the day to excess inductive kvar at other times of the day Rather than maintain a fixed number of capacitors in the system, a fixed number of capacitors is kept in the system, and they are supplemented by capacitors that are switched incrementally into and out of the system either by automated or manual means as required to correct inductive reactance and improve power factor
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A recording instrument called a kilovarmeter can plot the graph of power factor versus time and load conditions as was discussed earlier Figure 3-24, a plot of kilovars versus a 24-hr period of time, shows the results of adding switched capacitors to fixed capacitors to cancel inductive reactance This graph can represent either the kilovar curve of power demand for a town or an individual feeder on a large distribution system It can be seen that the lowest kilovar requirement occurs at 4:00 am, when the load is lowest The bank of permanently installed 400-kvar capacitors can correct the power factor at that time However, additional capacitors from a bank of 1000-kvar switchable capacitors can be switched into the system as needed to eliminate leading power factor in the shaded area from midnight to 4:00 am and from 4:00 am to the next midnight It can be seen that maximum load and correction occurs at about 8:00 pm If a severe voltage drop occurs in the system, the capacitors will be removed However, if the voltage problems that occur on a distribution system are not serious in the town or feeder represented in this figure, and the prime purpose for installing capacitors is to correct power factor on the generators, the capacitors would be probably be installed at the generating station
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A synchronous condenser can provide continuous power factor correction without the use of capacitors Precision control of the motor fields of the latest synchronous condensers
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Figure 3-24 Plot of kilovars versus time, showing the effects of using fixed and switched capacitors
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produces the exact amount of vars needed to correct any power factor without annoying switching transients These units are not affected by the harmonic currents produced by solid-state motor drives Features of a standard synchronous condenser are
I I I I I
Three-phase synchronous brushless motor Solid-state voltage and power factor regulators Electrically operated main circuit breaker Switchboard-grade varmeter and power factor meter Start and control logic with internal fault monitors
Phase Converters
Single-phase power can be obtained from any three-phase electrical system by connecting any two phase leads However, it is not possible to obtain three-phase power from a single-phase power source without recourse to either a rotary or static phase converter A rotary phase converter is a machine that can convert single-phase power to threephase power More accurately termed a phase generator than a converter, it generates a voltage that, when paralleled with two voltages obtained from single-phase line power, produces three-phase power Rotary converters can provide three-phase current that can power three-phase as well as inductive loads Figure 3-25 is a schematic diagram for a rotary converter The electromechanical machine is connected to a single-phase source, and it generates a third phase output for powering three-phase loads and motors Single-phase lines L1 and L2 are connected to a three-phase fused disconnect switch or magnetic starter The outputs of the
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