What is the current?

Inrush current is the energy that is supplied to an electronic or magnetic device when it is turned on. This may include devices such as a computer, copier or engine. The average current is usually much greater than the normal current needed to safely operate the device. Thermistors and active circuits are built into the device to compensate large currents. The effects of the incoming current include tripping the fuse and circuit breaker.

Inrush current can be 20 times greater than the normal operating current of the electronic device. It usually takes 10 milliseconds for the current to lower to a normal level. In general, the number of times over a circuit flowing before a reduction is between 30 and 40. During this period, several things can happen. Components on a computer called filter capacitors produce large curly and promote. The typical effect of the provision current is to prevent the operation of circuit breakers or fuses normally. A more serious problem is that the overvoltage current can pOkodzit contacts with switching as they pass, basically welding contacts together.

There are several ways to fix the problems associated with the overvoltage current, including the wire size or the installation of the switches. To determine which method is best, it is necessary to measure the current of the liner using the meter. The clamping meters are usually used to measure steep current.

The most reliable meters usually have the ability to measure the time to capture the peak and have the function of holding the peak. These two specifications ensure that a steep stream measured. Good meters have a measurement time of a maximum of 1 millisecond while cheaper models have a time of 100 milliseconds. From the majority stream, it is scattered into 10 milliseconds, slower models or the overvoltage itself.

Surge limitation can also be called a limiting thermistor, which is a heat -sensitive resistor that responds to a change in the perimeter temperature. As the temperature rises, the resistanceThe resistor is essentially decreasing, allowing a sharp current to flow through the perimeter. This prevents the accumulation of steep stream.

Since the overvoltage limiter is heated during its operation, it requires a cool impact before the next insert. During the recovery time, the surge limiter resistance is gradually complemented. This allows it to effectively suppress the following current.