电容放电pt电抗（Capacitor discharge Pt reactance）.docVIP

电容放电pt电抗（Capacitor discharge Pt reactance） The zero sequence PT I mentioned above is the three-phase discharge coil of the capacitor, and the 2 coil is connected in accordance with the open triangle connection. Discharge coil is actually a PT, in each phase of capacitors and a normal operation when opening, no output, because the capacitor neutral, open delta has always been a bit of ground, if a phase capacitor group capacitor damage, such as three-phase load imbalance, therefore the opening is output. Zero sequence voltage action, so the opening of the discharge coil is not connected with the opening of the bus PT. The primary coil of the discharge coil is connected in phase to the capacitor bank, and can be discharged automatically when the capacitor switch is switched off. The 2 coil of the discharge coil is connected with protection. Discharge coil at the end of the day, is a PT. Capacitor after the power failure, there is voltage, can not be directly grounded discharge, the current is very large. The discharge is controlled only by the resistance of the discharge coil. The discharge coil is selected according to different capacitance and current. The direct earthing discharge will cause damage to the overcurrent discharge of the capacitor. The discharge coil is an inductor XL and is connected in parallel with the capacitor. When the capacitor is running, the discharge coil reactance is great. Equivalent to open circuit. When the capacitor switch is switched off, the AC voltage is zero, the reactance of the discharge coil becomes smaller, and only the impedance is released. The residual charge on the capacitor is rapidly released. Attenuation oscillation process, time is related to LC and load The main components of the electrical circuit are resistance, capacitance, and inductance. The inductor has the effect of suppressing the change of the current and alternating the alternating current. The winding static induction device with inductance is called a reactor