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2em;">接地電阻測試時應使用接地電阻測試儀（又稱接地電阻測試儀）。在使用過程中，不僅要注意使用的方法和步驟，還要選擇正確、合適的儀器。測量方法只有三種：地樁法、夾具法和地樁夾具結合法。下面介紹三種正確選擇接地電阻測試儀的方法。<br/></span></p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><br/></p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24); text-indent: 2em;"><span style="font-size: 16px;">地樁法：</span></p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><br/></p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24); text-indent: 2em;"><span style="font-size: 16px;">地樁法可分為二線法、三線法和四線法。1、雙線法：這是原來的測量方法：一根線接被測接地體，另一根線接輔助接地極。這種方法的測量結果R=接地電阻+地樁電阻+引線和接觸電阻，所以誤差較大，現(xiàn)在一般不采用。2、三線法：這是兩線法的改進版，用兩個輔助極點，用公式計算。當中間輔助地極為總長度的0.62倍時，基本可以消除地樁電阻引起的誤差。這種方法沿用至今。然而，該方法不能消除被測接地體風化、腐蝕引起的接觸電阻誤差。3、四線法：這是在三線法的基礎上改進的方法。這種方法可以消除輔助接地電極、表筆和接觸電阻的接地電阻引起的誤差。</span></p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><br/></p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24); text-indent: 2em;"><span style="font-size: 16px;">夾緊方式：</span></p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><br/></p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24); text-indent: 2em;"><span style="font-size: 16px;">夾緊法分為單夾緊法和雙夾緊法。1、雙鉗法：根據(jù)導體在變化的磁場中會產(chǎn)生感應電壓的原理，用一個鉗子通過變化的電流產(chǎn)生交變磁場，使磁場中的導體產(chǎn)生一定的感應電壓。用另一把鉗子測量這個電壓產(chǎn)生的感應電流，最后用歐姆定律計算出環(huán)路值。它的應用條件是：一是要形成回路，二是另一端的電阻可以忽略不計。2、單夾法：單夾法的本質是將雙夾法的兩只鉗子合二為一。但萬一發(fā)生機械損傷，相鄰的兩只鉗子難免會相互干涉，</span></p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><br/></p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24); text-indent: 2em;"><span style="font-size: 16px;">地樁與夾具組合：</span></p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><br/></p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; 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