FDEG-40(-55) 0.6/1kV 1.8/3kV  铜芯乙丙橡皮绝缘硅橡胶橡皮护套风力发电用耐寒(耐严寒)耐扭曲软电缆​，接地电阻测试方法及接地电阻测试仪使用方法图解春晨FDGF风能电缆耐扭转电缆​
Test method of grounding resistance and diagram of using method of grounding resistance tester.
一、接地电阻测量的几种方法


One, several methods of grounding resistance measurement
1. 两线法
1. two line method
条件：必须有已知接地良好的地，如PEN等，所测量的结果是被测地和已知地的电阻和。假如已知地远小于被测地的电阻，测量结果可以作为被测地的结果。


Conditions: there must be known earthing, such as PEN, etc. the measured result is the measured resistance and the known resistance. If the resistance is known far less than the measured resistance, the measurement result can be used as the result of the test.
适用于：楼群稠密或水泥地等密封无法打地桩的地区。
Suitable for: dense buildings or cement seal not playing pile area.
接线：E+ES接到被测地，H+S接到已知地。
Connection: E+ES receives the tested place, H+S receives known.
2. 三线法
2. three line method春晨FDGF风能电缆耐扭转电缆​


条件：必须有两个接地棒：一个辅助地和一个探测电极。 各个接地电极间的间隔不小于20米。原理是在辅助地和被测地之间加上电流，测量被测地和探测电极间的电压降，测量结果包括测量电缆本身的电阻。
Condition: there must be two grounding rods: one auxiliary and one detecting electrode. The intervals between the earthing electrodes are not less than 20 meters. The principle is to measure the voltage drop between the measured and detected electrodes by adding current between the auxiliary ground and the measured area. The measurement results include measuring the resistance of the cable itself.
适用于：地基接地，建筑工地接地和防雷接地。
It is suitable for grounding, grounding and lightning protection for building sites.
接线：S接探测电极，H接辅助地，E和ES连接后接被测地。春晨FDGF风能电缆耐扭转电缆

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Connection: S is connected to the detection electrode, H is assisted, E is connected to ES, and then it is measured.
3. 四线法
3. four line method
基本上同三线法，在低接地电阻测量和消除测量电缆电阻对测量结果的影响时替换三线法。测量时E和ES必须单独直接连接到被测地。该方法是所有接地电阻丈量方法中正确度最高的。
Basically, the three wire method is replaced by the three wire method in the measurement of the low earth resistance and the elimination of the influence of cable resistance on the measurement results. When measuring, E and ES must be directly connected to the tested area separately. This method is the highest accuracy in all grounding resistance measurement methods.
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