How to choose a leakage protector
1. How to choose the size of the leakage protector
The leakage protector is divided into rated current and operating current. The rated current of DZ47 is generally divided into 10A, 16A, 20A, 25A, 32A, 40A, etc. The operating current is usually 30mA, 10mA, 100mA, etc. Household booster pump power should be about 1KW? Current 6A, starting current is larger, optional 20A, D type, do not use C type.
Second, how to choose the type of leakage protector?
In order for the leakage protector to safely and effectively protect our personal safety, we must select and consider the following main parameters.
1. Leakage action breaking time: The operating time is from the sudden application of the leakage current to the protected circuit or the device is completely cut off. Of course, we choose to choose the leakage time. The shorter the break time, the safer we are. If the current flowing through the human body is large, even if the power-on time is short, there is a danger. Conversely, if the current is small, the power-on time is slightly longer and there is no danger. That is to say, the degree of danger of being shocked is related to the product of current and time, ie: I 〃 T = 50 mA 〃 s (effective value). This means that when the human body passes a current of 100 mA, the energization time is less than 0.5 s, for example in When the current is cut off at 0.4s, then people can be saved. If the current is cut off at 1 s, people are very dangerous. Later, in order to fully guarantee personal safety in the event of an electric shock, other scientists reanalyzed Cobb's theory and considered a more appropriate safety factor. That is: I〃T=30mA〃s Therefore, in the current electrical engineering design, if it is necessary to select the leakage protector at the end of each power distribution system, it is generally required to be 30 mA 〃 s based on this.
2. The leakage protector can be divided into three types during the operation time to ensure the safety protection effect and the need for the grade protection when the person is exposed to electricity: Fast type: the action time does not exceed 0.1 seconds. The time limit type: the action time does not exceed 0.1∽ 2 second inverse time type: When the current is running, the action time does not exceed 1 second; when the action current is 2 times, the action time does not exceed 0.2 seconds; when the action current is 5 times, the action time does not exceed 0.03 seconds. When we choose to use as leakage protection, we should use a fast type of leakage protector with an operating time of less than 0.1 seconds.
3. Rated leakage non-operating current Iâ–³n0: When the leakage protector has a specified leakage current in the circuit, it should ensure normal operation, and the fault current should not reach the specified value to ensure no action. This is a very important parameter that is often overlooked, and manufacturers are often forgotten in the product manual.
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