In low voltage power system, the use of electric power capacitor
is to improve the power factor of system, reducing reactive power loss.
Power capacitor _ the damage happened in explosion accidents occurred frequently, even light distribution equipment damage, or destruction of buildings and cause fire.
The following analysis the reason and prevention measures are put forward.
Explosion causes of a single power capacitor is made up of three capacitors connected into delta form, in a transformer oil seal container, the top draw out three terminals, as shown in figure l.
C in the figure is made up of a set of capacitor (
Two, three or more)
And pick up.
Set A, B and A capacitor is punctured (
See figure 2)
Figure 2 is A, B and the equivalent circuit.
Its equivalent resistance R for the plastic capacitor.
Due to the breakdown is a gradual process of capacitor, the equivalent resistance R is a dynamic variable resistor.
Breakdown process, the capacitor capacitance can produce joule heat, the joule heat expression for Q = I2Rt = U (
Square/Rt = 380 square/Rt (
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Because of the dynamic resistance R is from large to small, the longer, the more heat.
When capacitors have excessive leakage current or breakdown, capacitor in a short time to produce a lot of heat energy, the heat energy in the capacitor oil decomposition to produce a large amount of gas, the capacitor shell cannot afford the sharp increase of pressure, casing damage and even explode.
This is the main reason.
Secondly, as power factor compensation capacitor, the capacitor for refund amount related to the system.
If frequent operation, call the voltage depression is just the reverse of residual charge polarity capacitor group, will produce a large current, the failure reasons of the capacitor.
1 preventive measures.
Under normal circumstances, each phase of the capacitor current through RMS for I = V/WC, but according to the size of the power flow, press 1.
5 ~ 2 times, with the fast fuse.
If capacitance is punctured, the fuse will melt quickly and cut off the power and protect the capacitor will not continue to generate heat.
Install ammeter in compensation on each phase to ensure each phase current is not more than plus or minus 5%, if discover the imbalance, immediately run out, check the capacitor.
Monitor the rise of temperature of the condenser.
To strengthen the inspection of capacitor Banks.
Capacitor current partial usually has the following phenomena: the wires of a capacitor casing parts in oil leakage;
Capacitor drum belly.
Some capacitance no oil leakage, drum abdomen phenomenon will occur.
Found that the above situation, the capacitors shall run out, in case of explosions.
Damage of capacitor is usually easy to happen during the summer high temperature period, during this period, more should strengthen patrol.
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