Precautions for electrical accessories replacement and protective measures
Release time:
2025-04-10 00:00
Source:
Regarding the replacement and protection measures of electrical accessories, the precautions are divided into the following points.
1. In order to effectively suppress the damage of superimposed reverse overvoltage to the equipment, in addition to the installation of resistive protection, nonlinear resistance type overvoltage protector can also be used. This type of protector can quickly reduce its own impedance at the moment of overvoltage occurrence, discharge the overvoltage energy into the ground, and its response speed can reach nanoseconds, and the protection mechanism can be activated in a very short time when the voltage suddenly changes. At the same time, in the system design stage, optimizing the grounding system is also key, by reducing the grounding resistance, the release rate of overvoltage energy can be accelerated, and its impact on the equipment can be reduced.
2. For the power controller that realizes stepless adjustment by phase-shifting trigger, its core advantage is that it can accurately control the output power according to the actual demand of the load. In the field of industrial heating, the traditional on-off power control method will cause large temperature fluctuations and affect product quality, while the phase-shift trigger controller can achieve stable temperature control by smoothly adjusting the voltage. In practical applications, it is necessary to pay attention to the adjustment range and accuracy of the trigger angle, which is usually controlled between 30° and 150°, which can not only ensure the flexibility of power adjustment, but also avoid the current distortion caused by the small trigger angle.
3. Regarding the setting of the rated input voltage from zero to 98%, this is the result of comprehensive consideration of the fluctuation characteristics of the power grid and the safe operation of the equipment. During the normal operation of the power grid, the voltage fluctuation range is generally within ±10%, and the setting upper limit is set to 98%, which reserves a safety margin of 2% for the equipment, which can effectively prevent damage to the equipment due to sudden increase in grid voltage. At the same time, setting the lower limit to zero provides the possibility of voltage control of the equipment under special working conditions such as start-up and failure. For example, in the process of soft start of equipment, the voltage can be gradually increased from low voltage to rated voltage to reduce the impact of starting current on the power grid and equipment. In addition, when the power grid voltage drops abnormally, the equipment can adjust the working status in time according to this setting range, so as to avoid damage or failure to operate normally due to low voltage.
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Precautions for electrical accessories replacement and protective measures
Regarding the replacement and protection measures of electrical accessories, the precautions are divided into the following points.
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