Infrared Thermography Appliances There are many kinds of power equipment failures, but most are accompanied by fever. From the perspective of infrared diagnostics, it is usually divided into external faults and internal faults. It is well known that during operation of a power system, current-carrying conductors can cause resistive losses due to current effects, and there are a large number of connectors, connectors, or contacts on the entire circuit of power transmission. In an ideal situation, the contact resistance of various connectors, connectors, or contacts in the power transmission loop is lower than the resistance of the connected conductor portion. Therefore, the heat loss at the connection portion will not be higher than that of the adjacent current-carrying conductor. However, once Some connectors, connectors, or contacts will cause increased contact resistance due to poor connections. This area will have more resistive losses and higher temperature rise, causing local overheating. This is usually an external fault. Harbin Yuda Electronic Technology Co., Ltd. produces moisture meters and moisture analyzers
The characteristics of external faults are: local temperature rise, easy to use infrared thermal imager to find, if not handled in time, the situation deteriorates quickly, easy to form an accident and cause losses. External faults account for a large percentage of faults.
The so-called high-voltage electrical equipment internal faults mainly refer to various faults caused by solid electrical insulation and electrical circuit failure inside the device housing and deterioration of the insulation medium. Since such failures occur inside the electrical equipment, the temperature rise of the reflected equipment surface is very small, usually only a few K. Detection of this type of fault has a high sensitivity to the detection equipment.
The characteristics of internal faults are: the fault ratio is small, the temperature rise is small, the hazard is great, and the requirements for infrared detection equipment are high.
According to the long-term measured data provided by relevant units and the comprehensive statistics of a large number of cases, external thermal defects of electrical equipment generally account for 90% to 93% of the total index of equipment defects, while internal thermal defects only account for 7%.
About 10%.
In the power industry, thermal imaging cameras have long been used in the safety overhaul of equipment, through its detection of thermal defects in electrical equipment and lines, such as transformers, bushings, circuit breakers, switches, transformers, power capacitors, Arresters, power cables, busbars, conductors, electrical appliances, insulator strings, low-voltage electrical appliances, and secondary circuits with current, voltage heating, or other heating effects, can be used to detect, treat, and prevent major accidents in time. To a very critical and effective role.
The so-called thermal defect of electrical equipment usually refers to the phenomenon of fever caused by internal or external causes detected by certain means.
Depending on the reasons for the defects, we usually classify them into three types: one is components that have been exposed to the air for a long time, or that are caused by temperature and humidity, or surface contact due to scaling, or due to external forces. Damage, resulting in heat generated by the reduction of the conductive cross-sectional area. If connectors are not connected properly, bolts and gaskets are not compressed; corrosion is oxidized in long-term operation; corrosion caused by reactive gases and dust in the atmosphere; components are poor in materials; conductors are damaged due to poor processing and installation techniques; mechanical vibration causes various causes. The actual cross section of the conductor is reduced; the load current is unstable or exceeds the standard.
The other is due to the internal fault of the appliance itself, such as excessive resistance caused by poor connection of the internal connection components; aging, cracking, and dropping of the insulation material; dampening of the internal components, increased loss of vital components, and blockage of the cooling medium pipeline.
For those devices and vital components that can be observed directly, thermal imaging cameras can detect the heat hazard of all connection points. For those parts that cannot be seen directly because they are blocked, they can be analyzed based on the fact that their heat is transferred to the outer parts, which leads to the conclusion. Due to the fact that the actual situation on the scene is ever-changing, even if you get a picture with hot spots through the thermal imaging camera, in order to make an accurate judgment, it may be affected by many factors. Such as the current temperature, air volume, load, etc. We can make relevant analysis according to different characteristics and make corresponding judgments such as:
In order to ensure the safe and efficient operation of power production, higher requirements have been put forward for state maintenance of power equipment. Because the status overhaul mainly depends on the status detection and on-line monitoring methods of the running equipment, the power equipment running status detection and online monitoring always play an important role in the power safety production. As a new technology, infrared imaging technology has unparalleled advantages in the detection of power equipment operation status. Infrared imaging is based on the distribution of the thermal state of the device to diagnose whether the device is operating properly or not. It has non-stop operation, no contact, long-distance, quick and intuitive imaging of the prepared thermal state. Since the thermal image of the device is a true description of the thermal state and its temperature distribution in the operating state of the device, whether the thermal distribution of the electrical device is normal in the operating state is an important feature for judging whether the device state is good or not. The use of infrared imaging technology can diagnose the status of equipment and its hidden defects by analyzing the thermal image of the equipment.
Using infrared imaging technology can carry out the following power equipment status detection and fault diagnosis.
â— High-voltage electrical equipment operation status detection and internal and external center fault diagnosis:
â— All kinds of conductive joints, clamps, wiring pile head oxidation corrosion and poor connection defects;
â— All kinds of high-voltage switch inner contact bad contact defects;
â— Isolation knife blade and contact plate and rotating cap and ball joint bad defects;
â— All kinds of CT inner-center and outer-center connection bad defects, defects in body and oil insulation, and abnormal thermal failure in the inner center core and coil;
â— All kinds of PT insulation defects, lack of oil, and the inner core and coil abnormal bad overheating defects;
â— Overheating of various types of capacitors, poor insulation of coupling capacitor oil, and lack of oil (low oil level) defects;
â— Various types of lightning arresters have defects such as moisture in the center, aging of inner core components, or non-linear characteristics.
â— Contamination defects on various types of insulated porcelain surfaces, zero-value insulator detection, and degraded porcelain bottle detection;
â— Generator running status detection, brush and slip ring contact state detection, inner center overheating detection;
â— Abnormal overheating of the power transformer box, eddy current overheating, poor connection between the upper and lower ends of the high and low pressure bushings, and lack of oil (low oil level) defects in the oil filled bushing;
â— All kinds of motor bearing bushes are in poor contact and the center of the body is abnormally overheated.
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