Problems existing in reactive capacitor compensation cabinet

As far as you are concerned, I will make a few points: 1. The reactive power compensation cabinet on the secondary side of each transformer can only be operated by one controller. If two controllers work at the same time, there will inevitably be a phenomenon of cyclic switching, that is, under-compensation and over-compensation are easy to reciprocate; 2. Installing a compensation cabinet can only increase the compensation capacity (compensation tuning circuit), and cannot install a capacitor cabinet with a controller; 3. If you want to add a compensation cabinet with a controller, it can only be used as a backup cabinet, and the backup cabinet can be enabled when there is a problem with the main cabinet; 4. According to the above reasons, the sampling current of the two controllers can use the original current transformer, because only one compensation cabinet (controller) is working; 5. The current sampling lines of the two compensation cabinet controllers are connected in series with the transformer.

This guy's answer above is basically ok. In fact, in this case, just connect the newly added capacitor cabinet contactor to the original controller. If the controller control loop is limited, you can connect two capacitor loops to the controller together.