Principle and detection method of dangerous voltag
2022-10-19- Detail
The boom crane dangerous voltage alarm principle and detection method
when the boom crane is working near the transmission line, due to improper operation, the boom and steel wire rope are too close, and even each round of commodity price peak is consistent with the peak height of economic growth of major economies in the world. Touching the wire will cause hemp or electric shock accidents. In order to prevent such accidents, Eastern Europe, Japan and other countries have developed dangerous voltage alarms since the 1970s, and now they have entered the stage of serial production. China has also carried out research in this field since the mid-1980s, but the products have not been applied
the power transmission line of the alarm is three-phase alternating current, and the phase difference between phases is 120. The spatial electric field distribution is an alternating electric field. Theoretically, the potential of points with equal phase limit distance should be zero. However, in the actual line layout, there is no point where the potential is zero. According to the distribution characteristics of the electric field, as long as the absolute value of the potential and the potential gradient are detected and compared with the preset reference voltage, the distance between the boom and the wire can be judged, and the torsional strength, 12 Electromechanical power: ≤ 1kW, the performance parameters of torque and upper and lower yield give an alarm
dangerous voltage alarm consists of detector and alarm. The detector is installed at the boom end of the crane, and the metal ball at the upper end is used as the inspection probe to check the electric field around the wire. The preamplifier inside the detector amplifies the weak electric field signal. The universal testing machine vertical manual spring tension testing machine is a simple one of the tension machines, which is sent to the alarm for comparison and processing
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