Control of secondary overvoltage of current transformer

Recently we want to transform the PT secondary breakdown fuse into an electronic breakdown fuse. I don’t know how the performance is? Have there been any unsafe situations? Please tell me if you know anything, thank you!

first question: Generally speaking, a protector needs to be installed on the secondary side of the CT, but none of the protectors I have seen have been installed, and none have been designed. The following are the reasons for installing them.: 1. For microcomputer devices that use very large scale integrated circuits, operating voltages of only a few volts, and signal currents of only microamperes, the heat resistance capacity is smaller than that of previous electromagnetic protection devices, and the ability to withstand spike pulses is relatively fragile. In particular, the transient impact of lightning overvoltage will cause the introduction of lightning electromagnetic pulses into the substation power line, causing transient overvoltage. If it enters the power system directly without treatment, it will cause damage to the power supply of secondary equipment. 2. The induced overvoltage caused by lightning introduced into the communication line will cause a certain potential difference between the communication line and the equipment to directly act on the serial communication port, which will damage the serial port of the microcomputer and communication equipment. In severe cases, it will damage the microcomputer. 3. Secondary cable introduces lightning: For secondary connection cables that are directly connected to primary equipment, the induced overvoltage caused by lightning electromagnetic pulses directly acts on the front-end central processing computer, which can burn the function board components at worst, or burn down the entire computer at worst. 4. Irregular grounding: When a lightning electromagnetic pulse causes a potential difference between grounding points, the generated electromagnetic field interference will affect the operation of the front-end central processing computer and damage the template of the front-end central processing computer. At the same time, if the grounding resistance is unqualified, the ground potential increase caused by lightning will also be introduced into the front-end central processing computer through the equipment's grounding wire, and at the same time, the plug-in of the front-end central processing computer will be damaged. This post was last posted by * Edited by QIU on 2009-4-14 12:09 ]

For protection, you can add it if you want, no one will restrict you unless there are requirements in the drawings