Electrical equipment fault diagnosis method

For example, the same type of fault may have different fault phenomena. Different types of faults can be the same fault phenomenon. The identity and diversity of the fault phenomena bring complexity to the fault finding . However, the fault phenomenon is to find the basic basis for electrical fault is to find the starting point for electrical faults, and therefore should observe and analyze the phenomenon of failure, identify the most important and most typical aspects of the phenomenon, find out when the fault occurred, the location , Environment and so on. Directly aware of some electrical faults can be detected through the human hand, eyes, nose, ears and other organs, the use of touch, read, smell, listen and other segments, directly aware of abnormal temperature rise equipment failure, vibration, odor, sound, color change, etc., to determine Fault location of equipment. Instrument detection Many electrical faults rely on the direct perception of people can not determine the site, but to use a variety of instruments, meters, on the fault equipment voltage, current, power, frequency, impedance, insulation value, temperature, amplitude, speed and so on Quantity to determine the fault location. For example, by measuring the insulation resistance, absorption ratio, the price loss to determine the equipment insulation is damp; DC resistance measurement to determine the long-distance lines of short-circuit point, grounding point. Using the eyes, nose, ears, hands and other sensory organs, to observe directly observe the temperature, sound, color, smell is abnormal, to determine the operation of the power unit. Through this intuition, some obvious faults can be diagnosed immediately, or can help us analyze and grasp the fault occurred parts, endanger the scope, severity and damage to components. It is a very important first step in diagnosing a fault, for those hidden and complex faults that provide important basis for diagnosis and analysis through the various phenomena that we directly observe. Listen to any unusual sounds. 2. Smell a sniff There is no abnormal smell, in particular, there is no scorched smell of insulating material. General electrical components are made of insulating material. When the insulating material is burned or scorched at high current (several times over rated current), it will give a pungent smell and trace the place of smell to help us find out Fault source. 3. Check to see if there is abnormal temperature. A variety of power settings, whether static or rotary type, as long as the current flow, it will generate heat, the heat, the temperature rise, but as long as not more than the rated temperature is allowed. Power unit can continue normal operation, this temperature is basically in saturation, the change will not be great. If you find a sudden increase in the temperature of a component or a part of the fever hot, there is an anomaly, indicating that there may be a fault or a hidden fault exists, this time can be based on heat to find the point of failure. The following methods are commonly used to detect the temperature of the power supply unit. (1) to touch the hand, feeling and by the given to determine whether the temperature anomalies. Usually, it is necessary to consciously and frequently experience the temperature of the equipment and know the temperature of the equipment under normal operation. Therefore, it is possible to know whether the temperature exceeds the maximum allowable temperature by hand touch (but must pay attention to safety). According to experience, under normal circumstances, can touch the device to withstand the temperature of about 10s is about 60 degrees. (2) Thermometers can be placed on some of the most important parts or where special monitoring is required, with thermometers to detect and monitor their temperature. (3) For other parts or parts that need to be monitored for temperature, it is inconvenient to place the thermometer nor touch it by hand. In this case, you can know whether the temperature is abnormal or not by attaching the temperature-sensitive sheet or applying the temperature-proof coating according to the change of the color of the coating as the temperature changes. 4. Have a look whether there is smoking, whether there is charred, yellowing or burned black components. When overload and short circuit caused by a large current through the components (or components), the lighter will be far parts of the hot, hot yellowing. In severe cases, the components (or components) will be burnt to smoke, hair, black. In this case, according to the damaged components, find the point of failure, analyze the cause of the malfunction.

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