摘 要：近年來(lái)，天津地區(qū)電纜終端金屬外護(hù)套接地裝置被盜嚴(yán)重，接地裝置的被盜破壞了電纜系統(tǒng)的電氣完整性。短路時(shí)，由于接地通道的不完整，金屬外護(hù)套產(chǎn)生過(guò)高的感應(yīng)電壓將造成電纜外護(hù)套多點(diǎn)擊穿，使金屬外護(hù)套上形成環(huán)流，進(jìn)而直接影響整個(gè)電纜系統(tǒng)的安全穩(wěn)定運(yùn)行。為解決此問(wèn)題，通過(guò)對(duì)接地裝置中利用鋁芯接地線和鍍鋅圓鋼代替銅芯接地線可行性的理論計(jì)算分析，推導(dǎo)出了短路情況下鋁芯接地線和鍍鋅圓鋼所需的最小截面，從而大大降低了接地裝置的被盜可能性。

關(guān)鍵詞：接地裝置；防盜；TJ-240銅芯電纜；鋁芯電纜；鍍鋅圓鋼
Outside cable termination metal protective covering grounding security technological transformations research
Liu Yuan Kang
(TIANJIN TEDA ENGINEERING & DESIGNING CO.LTD ,528400,TianJing)
Abstract：In recent years, outside the Tianjing area cable termination metal the protective covering grounding is robbed seriously, the grounding is robbed destroyed the cable system electrical integrity.When short circuit, because the earth channel is incomplete, outside the metal the protective covering will produce the high induced tension to create outside the electric cable the protective covering multi-spot puncture, will cause outside the metal on the protective covering to form the circulation, then direct influence entire cable system security stable movement.In order to solve this problem, meets the grounding and the galvanization round steel through the docking installment in using the aluminum core replaces the copper core to meet the grounding feasible the oretical calculation analysis, inferred in the short circuit situation the aluminum core to meet the smallest section which the grounding and the galvanization round steel needed, thus reduced the grounding to rob greatly the possibility.
Key words：Grounding; Security; TJ-240 copper core electric cable; Aluminum core electric cable; Galvanization round steel