What are the main points and points of attention of the power regulator?

Last Update Time: 2021-06-12 10:59:33

The role of power regulator

The power regulator has infinite or large resistance, then the loop connected in series with the resistor can be regarded as an open circuit, and the current is zero. The resistors commonly used in industry are between two extreme cases. It has a certain resistance and can pass a certain current, but the current is not as large as when it is short-circuited. The current-limiting effect of the power regulator is similar to that of a small-diameter tube connected between two large-diameter tubes to restrict the flow of water.

The power regulator is a current-limiting element. After connecting the resistor in the circuit, it can limit the current through the branch it is connected to. Low-power power regulators are usually made of carbon cloth encapsulated in a plastic case, while high-power power regulators are usually wire-wound power regulators, which are made by winding a metal wire with large resistivity on a porcelain core. The resistance value of a power regulator is close to zero ohms, then the resistor has no hindrance to the current, and the circuit connected in series with this power regulator is short-circuited, and the current is infinite.


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The main points of using power regulator

1. The limitation of the load characteristics of the power regulator for resistive loads. When the inductive load is at a certain conduction angle, it may cause the thyristor to not conduct.

2. The influence of the power factor of the power regulator may cause the power factor to decrease, especially in the case of "depth control ", the power factor will become lower, such as the regulator needs to be used for a long time or more for deep control, Appropriate compensation measures should be taken.

3. Define the adjustment range of the power supply voltage regulator, the output voltage of the thyristor power regulator 0-380V (when the input voltage is 380V, the problem of conduction, because the actual output voltage will be slightly lower than 380V), as claimed in greater than 380V Then it should be considered to use inductive regulator (which can be designed to output voltage 0-2X380V).

4. Thyristors have many advantages in over-voltage and over-current protection, but their ability to withstand over-voltage and over-current is poor. Short-term over-voltage and over-current will cause component damage. Although there is a certain safety factor in the selection of the thyristor (the average current of the thyristor is 1.5-2 times the average current when the actual current is converted to A = 0 ° C, the maximum withstand voltage is 2-3 of the maximum value of the actual voltage Times), but still need to take certain protective measures. Over-current protection generally adopts automatic air switch and fast fuse. Over-current protection adopts resistance-capacitance absorption device and varistor. When not in use, the power supply should be cut off.

Several points for attention of power regulator

1. The load characteristic limit of the power regulator is used for resistive loads. Inductive loads at a certain conduction angle may cause the SCR to be non-conductive.

2. Limit the voltage adjustment range of the power regulator, the output voltage of the thyristor regulator is 0-380v (380v is the input voltage, the actual output voltage is slightly lower than 380v due to conduction problems). If the requirement is higher than 380V, the induction regulator should be considered (its output voltage can be designed as 0-2x380v).

3. Although the selection of the thyristor has certain safety factors (the average on current of the thyristor is 1.5-2 times the actual average current, and the maximum withstand voltage is 2-3 times the actual maximum voltage), some protection is still required Measures, generally use automatic air switch and fast fuse for overcurrent protection, resistance absorption device and capacitor overvoltage protection, should be cut off when not in use.

4. Although the thyristor technology is being developed, the effect of the power regulator on the power grid is small, but when a small (relative to the capacity of the power regulator) transformer provides both the power regulator and other equipment, the impact on other equipment It should attract attention.

 

If you want to know more, our website has product specifications for power regulators, you can go to ALLICDATA ELECTRONICS LIMITED to get more information