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Charging and discharging of capacitors
Release time:
2023/08/18 09:12
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During the operation of the capacitor, the current should not exceed 1.3 times the rated current of the capacitor for a long time, and the voltage should not exceed 1.1 times the rated voltage of the capacitor for a long time. The ambient temperature used by the capacitor shall not exceed the limits listed in Table 6---11. The temperature of the capacitor shell shall not exceed the specified value of the manufacturer (generally 60 or 65). The contacts of the capacitor should be kept in good condition, and there should be no signs of looseness or overheating; the bushing should be clean and there should be no traces of discharge; the shell should not have obvious deformation, and there should be no traces of oil leakage. The switchgear, protective device and discharge device of the capacitor should be kept in good condition.
Principle and Application of Power Capacitor Compensation
Power capacitors are commonly used equipment to improve power quality, reduce power loss, and improve the utilization of power supply equipment. The danger of explosion of capacitors during operation and the risk of residual charges in capacitors after power failure are safety issues that must be paid attention to. In the power system, the most convenient way to improve the power factor is to connect capacitors in parallel to generate the leading capacitor current to offset the lagging inductor current, and reduce the so-called reactive current that does not do work to a certain range. Power capacitors for compensation are either installed on the high-voltage side or on the low-voltage side; they can be installed centrally or decentralized.
How to judge the quality of capacitors
Common faults of capacitors are: open circuit, short circuit, leakage and capacitance reduction. For capacitors with large capacity, the pointer multimeter resistance block can be used to determine the quality of the capacitor and conduct qualitative analysis of its quality.Multimeter gear selection principle: large capacity, small gear; Small capacity and large gear. Typical capacity greater than 47 μF select R´ 100 stops, capacity 1~47 μF selected R´ 1 K stop, capacity less than 1 μF select R´ 10 K gear.
Advantages and disadvantages of aluminum electrolytic capacitors
Advantages: It has the advantages of easy to obtain large capacity, high withstand voltage, low price and other significant advantages, and is commonly used in the input and output filter circuit of the power supply.Disadvantages: fear of high temperature. Because the electrolyte of the aluminum electrolytic capacitor is liquid, heating of the core or high ambient temperature will cause the electrolyte to volatilize, and long-term high temperature will cause the electrolyte to dry up and fail.
Application Selection of Tantalum Capacitors
1. The superior characteristics of tantalum capacitors may make you love itTantalum capacitors have a wide operating temperature range, stable temperature characteristics, large specific capacity, and unique self-healing characteristics, which can meet the stability of long-term operation.2. The inherent Achilles heel of tantalum capacitors makes you hate iron but not steelThe key component of ordinary tantalum capacitor is Ta2O5, the medium should be unstable after heating stress, reliable use of low voltage, anti-surge voltage and surge current ability are poor, and the failure mode is short circuit, easy to cause high temperature, fire and other damage. Fire and other injuries. Fire and other injuries
Power Capacitors Parallel and Series
Shunt capacitor compensation: the same as the voltage level of the system, used to compensate for the inductive reactive power in the grid, which is the main purpose of improving the power factor of the system:
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