LV Intelligent Capacitors WC3 Series / WCX3 Series
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for Power Factor Correction and Energy Saving WC3 Series / WCX3 Series Introduction WII’s new generation of reactive power compensation equipment, LV Intelligent Capacitors for Power Factor Correction and Energy Saving (or simply called “intelligent capacitors”), can be used as individual compensators or as part of a centralized capacitor bank, formed by two or more capacitors connected in parallel. Compared to traditional capacitors, these intelligent capacitors offer additional protective features, including overvoltage, overtemperature, and undervoltage protection. Each intelligent capacitor comes with a built-in microprocessor, which automatically performs power-factor correction and controls the zero-crossing switch. • The built-in three-phase "zero-crossing switch" of the intelligent capacitor performs the switching operation (switch-on or switchoff) on its switch contacts one after the other, with a predetermined (fixed) time interval between the two. Figure 1 shows the current waveforms of Lines 1, 2, and 3 during a switch-on. • During switch-on at the voltage zerocrossing point, no inrush current is generated, which reduces the impact on the main power source and extends the service life of the capacitor. See Figure 2(A). Standard Type WC3 Series Harmonic Suppression Type WCX3 Series Figure 1 Three-phase current waveforms. Yellow: L1 Blue: L2 Pink: L3 Figure 2 Waveforms during switch-on or switch-off at voltage or current zero-crossing points. (A) Switch turns on automatically at voltage zero-crossing point. • During switch-off at the current zerocrossing point, no arc flash is generated, which protects the switch contacts from damage. See Figure 2(B). System voltage: 220 ~ 240V / 380 ~ 440V (Standard Type) 220V / 380V (Harmonic Suppression Type) Relative humidity for application: 20% ~ 90% Without inrush current. Special specifications available upon request Blue: voltage waveform Yellow: current waveform Switch turns off automatically at current zero-crossing point. There is no flash arc so that the switch contacts can be protec

Features Standard Type (WC3 Series) • High reliability of the intelligent capacitor has been demonstrated by a test of more than one million switch-on and switch-off operations. • Each intelligent capacitor can perform power factor correction on its own. When two or more units are connected in parallel to form a centralized capacitor bank, the first unit in parallel acts as the power factor regulator of the capacitor bank (if the first unit fails, the second immediately takes over, and so on). Capable of self-diagnosis for fault detection, it also offers additional protective features such...

Application Examples 3 examples of power factor correction solutions using an individual unit of intelligent capacitor * WFK: zero-crossing switch ** WSCR: low-voltage tubular power capacitors distribution transformer current transformer motor automatic power factor regulator power factor correction solution with a centralized capacitor bank using multiple units of intelligent capacitors power factor correction solution with a centralized capacitor bank using traditional capacitors and power factor correction devices (For details, please refer to the catalog "Low-Voltage Power Factor...