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                                                                                                                                                                                                                              TT-MK-A型低電阻接地模塊

                                                                                                                                                                                                                              TT-MK-A型低電阻接地模塊

                                                                                                                                                                                                                              一、TT-MK-A低電阻接地模塊性能特點
                                                                                                                                                                                                                              (1)  耐腐蝕、無毒害、使用壽命長、安裝方便,減少施工工作量; 

                                                                                                                                                                                                                              (2)  能吸濕保濕、接地電阻低;

                                                                                                                                                                                                                              (3)  耐大電流沖擊阻值不增大,也無變硬、發脆、斷裂現象;

                                                                                                                                                                                                                              (4)  能有效降低高電阻土壤率的接地電阻;

                                                                                                                                                                                                                              (5)  接地電阻受季節影響小,阻值能長期保持穩定。

                                                                                                                                                                                                                              二、TT-MK-A低電阻接地模塊技術參數指標

                                                                                                                                                                                                                              型    號

                                                                                                                                                                                                                              外型(mm)

                                                                                                                                                                                                                              質 量

                                                                                                                                                                                                                              工頻接地電阻

                                                                                                                                                                                                                              室溫下電阻率

                                                                                                                                                                                                                              低電阻接地模塊

                                                                                                                                                                                                                              500*300*80

                                                                                                                                                                                                                              500*400*60

                                                                                                                                                                                                                               

                                                                                                                                                                                                                              23kg

                                                                                                                                                                                                                              ≤5Ω

                                                                                                                                                                                                                              ≤0.38Ω.m

                                                                                                                                                                                                                              三、TT-MK-A低電阻接地模塊用量計算 
                                                                                                                                                                                                                                  根據多年使用接地模塊建造地網的實踐經驗,總結出如下模塊用量計算經驗公式:
                                                                                                                                                                                                                                           ρ·M
                                                                                                                                                                                                                              n = ———————— 計算結果是小數時收為整數。
                                                                                                                                                                                                                                           Rn·K

                                                                                                                                                                                                                              式中:n 是接地模塊數量。
                                                                                                                                                                                                                              ρ  —— 土壤電阻率。
                                                                                                                                                                                                                              M —— 模塊接地系數,取值范圍是0.12~0.16,土壤電阻率ρ越大,M 取值越小。
                                                                                                                                                                                                                              Rn —— 地網設計接地電阻值。
                                                                                                                                                                                                                              K —— 利用系數,取值范圍是0.7~0.85,模塊數量越多,K取值越小。

                                                                                                                                                                                                                              四、通常各系數之間的取值關系可參考下表:

                                                                                                                                                                                                                              土壤電阻率

                                                                                                                                                                                                                              接地系數(M)

                                                                                                                                                                                                                              利用系數(K)

                                                                                                                                                                                                                              ρ<200Ω.m

                                                                                                                                                                                                                              0.16

                                                                                                                                                                                                                              0.85

                                                                                                                                                                                                                              200≤ρ<500Ω·m

                                                                                                                                                                                                                              0.15

                                                                                                                                                                                                                              0.8

                                                                                                                                                                                                                              500≤ρ<1000Ω·m

                                                                                                                                                                                                                              0.13

                                                                                                                                                                                                                              0.75~0.8

                                                                                                                                                                                                                              ρ≥1000Ω·m

                                                                                                                                                                                                                              0.12

                                                                                                                                                                                                                              0.75

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