Nuclear capacity discharge protection device and power supply system

One or more embodiments of the present specification provide a nuclear capacity discharge protection device and a power supply system. The protection device may include a nuclear capacity protection energy storage element, wherein a positive electrode and a negative electrode of the nuclear capacity protection energy storage element are connected in parallel to a DC bus between a high-voltage DC power supply and an electric device through a first line and a second line respectively; and a converter which is arranged in the first line and the second line and is used for converting the energy storage voltage of the nuclear capacity protection energy storage element to be not lower than the lowest direct current power supply voltage value of the electric equipment so as to provide standby electric energy in the nuclear capacity discharge process of the initial energy storage element contained in the high-voltage direct current power supply. 本说明书一个或多个实施例提供一种核容放电的保护装置和供电系统，该保护装置可以包括：核容保护储能元件，所述核容保护储能元件的正负极分别通过第一线路