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When a single-phase ground fault occurs without leakage protection, the contact voltage = Un*Rd/(Rd+R0)=22058/(58+4)=206V, which is very near to the phase voltage and therefore highly dangerous. Due to the long-term presence of leakage current, Solar Stud leaking circuit breaker can also prevent cable overheating, reduce service life, and cause leakage arc current to burn electrical equipment.
In actuality, the Solar Stud earth leakage circuit breaker is a safety device, and its primary job is to prevent against indirect contact. A single-phase ground fault might result in a reduction in the light pole’s contact voltage, which is beneficial for preserving personal safety. If the Solar Stud leaking circuit breaker’s rated leakage tripping current (In) is 200 mA and the grounding resistance Rd is 200, the contact current is calculated as follows: Rd*In=200*0.2=40V. As an illustration, the average soil resistivity in the author’s region is 110, and the average value of the observed unipolar grounding resistance Rd is 58.
When a single-phase ground fault occurs without leakage protection, the contact voltage = Un*Rd/(Rd+R0)=22058/(58+4)=206V, which is very near to the phase voltage and therefore highly dangerous. Due to the long-term presence of leakage current, Solar Stud leaking circuit breaker can also prevent cable overheating, reduce service life, and cause leakage arc current to burn electrical equipment.
