What should I do if the series reactor often burns out during work?
Series reactors (capacitive reactors) are generally connected in series in high-voltage power capacitors or capacitor bank circuits. Its main function is to restrain higher harmonics, reduce the distortion of network voltage waveforms, and restrain the inrush current of capacitors during phase-cut switching. Series reactance The capacitor (capacitor reactor) often burns out during work as follows:
1. The lead connector of the series reactor (capacitive reactor) is burned out.
In the work in the power grid, the phenomenon that the lead joints of series reactors (capacitive reactors) are burned often occurs. That is, the external insulation, the connection between the outgoing terminals of each phase and the outgoing copper bars is significantly burned, and the lead terminals on the load side of a certain phase are burned and dropped. .Capacitors are in good condition, and relevant tests are carried out on the reactor, and no abnormality is found.
After analysis, it is found that the connection between the winding and the lead is poor. During the work, due to the loose connection between the winding and the lead due to oscillation, the contact resistance is too large. After the capacitor combined reactor is put into operation, the terminal connection is abnormally heated, resulting in a further increase in the contact resistance. The temperature of the connection rises sharply, and the high temperature causes the terminal to burn and arc to cause interphase short circuit. In the design of the reactor, it should be considered to avoid the burning of the loose lead at the connection between the winding and the lead. If bolted connection is used in the design, it should be avoided. The bolts are rolled, a virtual connection occurs, or the copper bar is connected to the copper bar.
2. There is an analysis of the burnout of the tap reactor.
A tap reactor refers to pulling out one or two taps on the winding, so that the reactor can be used as two or three reactors with different capacities. During the operation of the reactor, the lead connector of the reactor is connected to the reactor during the equipment. Wrong, the gear position of the capacitor does not match the gear position on the reactor, the reactor cannot effectively filter out the high-order harmonics, and cannot play the due role of the reactor, and the reactor is electrically dense in the tap section. Increase several times, the temperature rise reaches hundreds of K, the core magnetic density is full, and then the reactor winding is burned. The equipment method should be indicated in the instruction manual and outline drawing. The field equipment personnel must be careful to avoid equipment errors and loosening. .
