DC Leakage And Earth Fault Protection in DC Power Supply System

DC positive and negative leakage refers to unintended paths for electrical current to flow to ground from the DC positive or negative conductors in a DC electrical system, often due to compromised insulation or moisture, which can degrade system reliability and pose safety hazards.

NASN POWER A series DC power supply system adopts manual voltage meaurement to detec leakage.  It is advisable to perform a grounding test using an insulation resistance monitor every morning to measure the resistance to ground. 

• Voltage Measurement:

  In an ungrounded DC system, measure the voltage between each DC terminal and ground using a voltmeter. If there's a fault, the side with the fault will show zero voltage to ground, while the healthy side will show full DC voltage.

NASN POWER B series DC power supply system adopts automatic insulation detection function.

A Hall effect sensor is placed  around both the positive and negative cables. It senses the difference between the currents flowing through the positive and negative conductors.