How to solve the phenomenon of because of capacitor breakdown tripping operation

  • Time:
  • Click:434
  • source:BREDA CNC Machining
In a few industry application, often can use a lot of capacitor group, can configure fast break, flow too, press too, break pressure wait for protection, but the phenomenon that still can appear to cause tripping operation because of capacitor breakdown, this is how to return a responsibility after all, how should solve? Capacitor group breakdown analyses capacitor group to use means of commonly used star wiring, three-phase in all body crust is received at same iron frame, frame ground connection. Capacitor interior structure is 4 strings of structures of many component paralell connection, and protection of silk of the frit inside the setting, the member that overhaul personnel and factory family undertakes dissection to the capacitor of attaint, silk of the frit inside photograph of the A that discovers damage capacitor, B all fusing two, cover outside burst, through serious analysis, think fusing of silk of one photograph frit two root hind, outside causing, cover injury, outer cover below wounded circumstance, run development for a long time didymous carapace puncture, develop odd conterminous land. Because single-phase ground connection shows ground connection of not stable electric arc, make produce overvoltage soundly and another photograph also has fusing of two frit silk, cover outside get hurt cause didymous carapace puncture develops below overvoltage action, form alternate with short circuit from this, although protect credible action, but the fuel factor that tremendous short-circuit current produces, still cause the loss of certain level to capacitor, make capacitor crust is out of shape badly. Because electrified wire netting is medium existence is additionally many nonlinear bear, make electrified wire netting medium harmonic has certain content. Transformer substation of 110kV Zhang He is divided outside holding the position of dweller of outskirts of a city to use phone, basically hold the position of industrial power supply, outside eliminating line for special use of industry of a few 10kV, there still is plant of a few miniaturizations on other 10kV circuitry, cast the industrial user such as the factory, these users produce harmonic possibly. Although the harmonic of every generation is very few, but can the assemble enters electrified wire netting into make a present of of bigger harmonic electric current, make the harmonic level of electrified wire netting elevatory, the safety that affects facility of electrified wire netting moves. As a result of this transformer substation without merit compensation device, configuration reactance rate is the series connection reactor of 6, although the reactance rate of 6 can have inhibition to reaching above harmonic 5 times, but make below 3 harmonic series connection reactor and the impedance that compensate capacitor become look sex, occurrence harmonic electric current puts big appearance, make capacitor passes negative charge. Although be given priority to with 5 harmonic on bus, 3 harmonic content is not very tall, and after furnish capacitor, the 3 harmonic content with the will original impedance that allow a gender magnifies, the likelihood is caused inside frit silk fusing. Because total protection presses quadruplet capacitor 1 of rated electric current.

3 times whole calm, and the case that 4 groups of capacitor throw entirely is few. When some when on the high side of content of the harmonic inside period of time, always shed protection to cannot be moved too make, cause fusing of silk of the frit inside some photograph, and inside bring up the rear of frit silk frit cannot be discovered in time, bring about an accident to expand, cause fast break tripping operation. From the point of protective configuration, of capacitor interior breakdown protect a protection of silk of the frit inside the setting, and did not install the back-up protection that brings about an accident to expand -- lopsided voltage protection, make inside bring up the rear of frit silk frit cannot discover in time, cause fast break tripping operation accident, accordingly, protecting configuration to be not perfected is the main reason that causes capacitor accident to expand. Additional, nonsked measuring capacitance also is one of causes that cause an accident to expand. The reaction with because capacitor is in-house the most immediate device is the change of capacitance, and after capacitance measures hand stage, when the measurement that undertakes capacitor capacitance, need to use the measurement technique that demolishs jumper, measure the breakdown that bring about bushing troublesome and possibly to get power because of tearing open outfit jumper and produces bushing leakage oil not only. Accordingly, since investment moves overhaul personnel never has undertaken capacitance is measured, and the protection that did not install breakdown of reaction capacitor interior, when interior individual inside when frit silk fusing, cannot discover in time, cause an accident to expand. Capacitor breakdown improves measure 1.

In each bear has been installed to because shed protective basis too,be protected in loop in group when 4 groups of capacitor are thrown entirely, rectify calm, electric current of bisect group harmonic puts what cause greatly to shed a phenomenon too unresponsive, do not react even, accordingly, in each in group loop has installed bear protection, because communicate contactor to be able to open the bear electric current below normal circumstance only, cannot open fault current, communication contactor changes for ZN-28 vacuum breaker, when harmonic content is high, action at tripping operation, avoid harmonic to be caused to capacitor attaint and inside frit silk fusing. 2.

In each in group protection of voltage of triangle of loop installation mouth is become capacitor when fusing of silk of the frit inside some photograph, capacitive reactance happening changes, differ with other two-phase capacitive reactance, cause breakdown get along with perfect phase voltage is lopsided. Then, in each in group the mouth triangle place of 2 winding of loop voltage transformer installs low the voltage relay that makes calm cost, when fusing of silk of the frit inside one photograph, appear in mouth triangle place lopsided voltage, issue alarm signal, this device can be accurate breakdown of reflective capacitor interior, and do not get systematic ground connection and system the influence of lopsided voltage, exit wounded capacitor in time move. 3.

Measure capacitance to measure difficulty in the light of capacitance regularly, purchased advanced measurement equipment, use full automatic capacitance bridge surveys capacitor group regularly, the capacitance of only station capacitor, do not need to tear open jumper, measure handy and quick, accurate and reliable. Overhaul personnel undertakes capacitance is measured regularly, when capacitor some photograph individual inside after frit silk fusing, capacitance will produce change, should measure so that capacitance decreases, when exceeding 3, exit wounded capacitor in time move. Design and safeguard the neglect that waits for a respect to move possibly to the safety of capacitor bring hidden trouble, accordingly, configure perfect protection, measure capacitance regularly, check erroneous ideas at the outset, ability decreases to avoid capacitor accident to expand even, raise the usable rate of capacitor, prolong the service life of capacitor. CNC Milling CNC Machining