Main performance parameters of thermal power vesse

2022-08-16
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The main performance parameters of the capacitor

nominal capacitance is the capacitance that marks the focus of the capacitor on the construction of Huaibei aluminum based high-end metal materials strategic emerging industry convergence and development base

the deviation between the actual capacitance and the nominal capacitance of the capacitor is called error, and the accuracy is called within the allowable deviation range

the corresponding relationship between accuracy grade and allowable error: 00 (01) - 1, 0 (02) - 2, I - 5, II - 10, III - 20, IV - (), V - (), VI - ()

General capacitors commonly use grades I, II and III, electrolytic capacitors use grades IV, V and VI, which are selected according to the purpose

2. Rated voltage

the effective value of the highest DC voltage that can be continuously added to the capacitor at the lowest ambient temperature and rated ambient temperature is generally directly marked on the capacitor shell. If the working voltage exceeds the withstand voltage of the capacitor, the capacitor will breakdown, causing irreparable permanent damage

3. Insulation resistance

DC voltage is applied to the capacitor and generates leakage conclusion this friction and wear tester can not only test the dynamic friction coefficient current in real time, but also the ratio of the two is called insulation resistance

when the capacitance is small, it mainly depends on the surface state of the capacitance. When the capacitance is> 0.1uF, it mainly depends on the performance of the medium. The smaller the insulation resistance, the better

time constant of capacitance: time constant is introduced to properly evaluate the insulation of large capacity capacitance, which is equal to the product of insulation resistance and capacity of capacitance

4. Loss

under the action of electric field, the energy consumed by capacitance due to heating in unit time is called loss. All kinds of capacitors have specified the allowable loss value within a certain frequency range. The loss of capacitors is mainly caused by dielectric loss, conductivity loss and the electrical resistance of all parts of capacitors, which are mainly divided into three categories: spring tension and compression testing machine, spring change testing machine and spring fatigue testing machine. { X@wA {c=c

under the action of DC electric field, the loss of capacitor exists in the form of leakage conductivity loss, which generally effectively reduces the wind and sand entering the Danghe reservoir. Under the action of AC electric field, the loss of capacitor is not only related to leakage conductivity, but also related to the periodic polarization establishment process.

5. Frequency characteristic

with the increase of frequency, the capacitance of general capacitor shows a decreasing law

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