Zero sequence ct installation direction installed in reverse, whether the secondary wiring is also connected to the reverse

According to the query electronic enthusiasts, Baidu library know, zero sequence current transformer (CT) is a device used to detect the three-phase current vector sum, that is, the zero sequence current. If the zero sequence current transformer installation direction is installed in the opposite direction, then whether the secondary wiring also needs to be reversed depends on the installation location and purpose of the zero sequence current transformer. Generally speaking, there are the following cases:

1. If the zero sequence current transformer is installed in the three-phase conductor together through the position, then the installation direction is installed in reverse, the secondary wiring also need to be reversed, in order to ensure that the output of the zero sequence current direction is correct.

2. If the zero sequence current transformer is installed on the neutral line N, then the installation direction is reversed, the secondary wiring does not need to be reversed, because the direction of the current on the neutral line N is not affected by the three-phase conductor.

3. If the zero sequence current transformer is installed on a single-phase conductor, then the installation direction is reversed, the secondary wiring needs to be reversed depending on the requirements of the protective device. Some protective devices can be adjusted through the software settings to adjust the direction of the input zero sequence current, some protective devices need to be connected in accordance with the direction of the specified.