| 摘要 |
A monitoring device for real-time multi-point ground resistance is provided to measure a ground resistance and to perform a monitoring process by setting a path passing a ground between a monitoring ground point and a ground part of an ubiquitous AC main unit. A display and operating unit(120) is used as a man-machine interface and includes a display and a key pad. A processing unit(110) is connected with another unit in order to perform a bidirectional connection operation and to exchange data. A test and power unit(130) is connected to a neutral lead, a power lead, and a ground lead of an AC main unit(200) in order to control and rectifies AC power and to supply the AC power to another unit. The test and power unit determines ground conditions, obtain a ground resistance of the ground lead of the AC main unit, and provides a proper voltage source for a test contact point and a ground resistance. The test and power unit provides the proper voltage source for a ground resistance of a test ground point. A measurement unit(140) includes a plurality of monitoring ports which are connected through each of conductive wires to the test ground point. The processing unit selects periodically test ports and forms an electrical path of the voltage source, the test ports, the conductive wires, and the test ground point, and the ground lead of the AC main unit under a monitoring mode of a ground resistance monitoring device. The processing unit compares the measured result with a safety range of the test ports and generates an alarm signal when the measured range exceeds the safety range.
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