With the development of urban construction, renovation of the power cable is becoming increasingly frequent, which often causes the length of three segments to be unequal, bringing about unbalanced induced voltage in the metal shield and the circulating current in the metal shield.

The principle and analysis of sheath grounding and application of grounding way in practical running of cable were also introduced.

Accuracy of the existing sheath fault distance measurement methods is subject to test lead and contact resistance influence, and therefore is not satisfactory for practical fault location application.

The effect of reinforced protective layer and its control;

Analysis of the effect of protective layer thickness on the performance of RC eccentric compressive member;

Based on engineering example of protective layer mining in Hongling coal mine of Shenyang Coal Group,the mining-induced fracture distribution has been studied.

Design methods of the effective water-resisting thickness for the protective seam of the water barrier in fully-caving mechanized coal mining;

To seek the technique method for mining the thick seam in high gas and outburst mine safely and effectively,experimental researches are carried out on the laws of gas emission coal roadways such as protective seam,protected seam and beforehand drainage seam while excavating in the thick seam at the same area in high gas and outburst mine,and the causes are anslyzed.

0~(2D) finite element numerical simulation,it has proved that the pressure of overlying coal seam far away from the protective seam can be completely relaxed after the protective seam has been mined out.

Simple talking about the disabled problems of the protective coating in reinforced concrete components;

A study of the relationship between the thickness and strength of the concrete protective coating;

Combining the construction practice of many years, the article elaborates on the importance of steel protective coating and the control of its thickness in construction according to the common power mechanisms of steel and concrete.

Adhesion performance and corrosion resistance properties of two kinds of protective layers on 45# steel were researched.

The wall of archives storehouse is a compound wall consisting of waterproof layer (outside) + protective layer + damp course + thermal insulation layer+ heat accumulation layer + interior decorative surface (inside).