Electrician rating and actual value - Solutions - Huaqiang Electronic Network

SMD aluminum electrolytic capacitor

Electrical equipment connected to the circuit, their operating voltage and current have a specified value, this value is called the rated value. The use of electrical equipment according to the rated value can ensure safety and reliability, give full play to the performance of the equipment, and guarantee the normal service life. These technical data are designed and manufactured by the manufacturer according to the requirements of the production process, technical conditions and national standards. Ratings are usually marked on the nameplate of the device and in the instructions. In addition to special ratings, different electrical equipment are also rated for rated voltage ( UN ), rated current ( IN ) or rated power ( PN ). When the applied voltage is higher than the rated voltage, the insulating material of the electrical equipment is easily broken down due to excessive voltage, and the original insulating property is lost. When the electrical equipment is running, the heat generated by the current on the conductor resistance will increase the temperature of the equipment, and the temperature is too high, so that most of the insulating material is easily burned, so the rated current value is specified. The equipment operates at rated voltage and rated current, and the corresponding power is called rated power. When using electrical equipment, try to work as close to the rated value as possible. If it is too high, it will damage the insulation performance of the equipment and cause electric shock, fire and other accidents; too low, affecting the normal function of electrical equipment.
When the electrical equipment is in use, the actual values ​​of the voltage, current, and other parameters are usually affected by various factors. Therefore, the actual value of the equipment in operation tends to change, deviating from the rated value. In general, the actual value of an electrical device can vary within the range allowed by the device's rating. For example, a device is labeled 220V ± 10%. Indicates that the actual operating voltage of the device is allowed to vary between 198 and 242V.