HD-J swelling Zuji is a strong conductive material (carbon graphite), anti-corrosion materials, curing materials and filler materials and other components. Strong conductive material (carbon graphite) is used to reduce the grounding resistance; anti-corrosion anti-corrosion materials, used to prolong the life of grounding; unifying role played curable material, on the one hand drop resistance will not be washed away or loss of rain, another respect, make Zuji and grounding closely integrated to form one, and play the role of water absorption and retention. Second, the principle of HD-J resistance reducing swelling Zuji To illustrate the problem, first of all to give a definition of ground resistance, the so-called grounding resistance, that is, when the ground current spread to the earth through the ground body, the land of unlimited ambitious generation The potential rise and ground current ratio, called the grounding resistance, expressed in mathematical form as: R = U / I ............ (1) Where: When U-- ground current spread to the earth through the grounding of earth potential generated increased (V); I-- ground currents flowing into the grounding of the (security); R-- ground resistance (ohms); grounding resistance constitute the following three main areas: (1) ground wire and grounding electrode resistance itself; contact resistance (2) and soil surface ground electrode; (3) the distance from the electrode began to spread of the current path through the resistance. Because the earth electrode and lead multi-metal material, the resistance is small, so (1) without considering its impact on the ground resistance. It can be said (2) (3) and occupies almost all of the grounding resistance value, thus improving the resistance of these two items, so that the overall value of ground resistance reduction is a very important aspect.