Modular fault indicator and working method thereof

The invention relates to the technical field of power grid line on-line monitoring equipment, discloses a modular fault indicator and a working method thereof, realizes accurate and quick disassembly and quick change of fault element modules on a live line through modular installation of key elements and a fault judgment method, reduces the time cost required by disassembly of the whole machine, and improves the working efficiency of the whole machine. The power supply reliability is ensured; aiming at the problem of battery power exhaustion, all fault indicators in the same region are controlled to replace batteries in batches in a unified manner through a batch battery replacement method, so that the manpower and material resource cost is further saved; based on modularized installation characteristics, alarm and control of battery replacement are carried out by adopting a double-battery module design and a corresponding digital circuit, and methods such as a voltage measurement method, a battery modeling m