Introduction of technical parameters of power capacitor
View：86 Time：2016-06
Dawn: introduces the technical parameters of the power capacitor
"DAWN dawn" brand self-healing type low voltage shunt capacitor, metallized polypropylene film as the dielectric, the introduction of foreign advanced production technology, process and equipment, according to the GB/T12747 and IEC60831-1:1996 standard production. Products are mainly used for low voltage power grid to reduce the reactive power loss, improve the power factor and improve the quality of the power grid.
main features
1, the volume is small, the weight is light. Due to the adoption of the metal polypropylene film as the medium, the volume and weight are only 1/4 and 1/6 of the old product.
2, loss tangent value of small, low temperature rise, long service life. The unique design of the high brand power capacitor, the power consumption of the product itself is minimal, so the capacitor loss tangent value < = 0.06%, much lower than the GB / T12747-1991 standard 0. 2% requirements, the normal use of the temperature rise <3 degrees celsius. Because of this, "and DAWN" power capacitors compared to other products with longer service life.
3, high pressure resistance, good safety performance. "Dawn DAWN" power capacitor research material, design field is lower, the pressure between the terminals are far higher than the requirements of type test for 2.15Un10 seconds, the instantaneous breakdown voltage of >3.5Un. The product built-in discharge resistors and pressure isolator (explosion-proof device), operation and maintenance is very safe and reliable.
Main technical parameters
1, rated voltage (Un): 0.25-2kVAC
2, rated output (Qn): 1-200kvar
3, capacity deviation: -5 ~ +10%
4, loss tangent value < 20 C 50Hz 0.1%Un
5, pressure shell: 0.5kV the following products 3000VAC10 seconds
0.5kV above the product 2Un+2kV10 seconds: 2.15Un2 seconds
6, the maximum allowable voltage: <110%Un
7, the maximum allowable current: < 130%IN
8, self discharge characteristics: capacitor off power supply 3 minutes after the remaining voltage < 75V main technical parameters
No harmful gases and vapors, conductive or explosive dust and non violent vibration of the indoor.
1, altitude: < 2000m
2, the ambient temperature: 25/B (-25 /45 OC)
3, humidity: < 85%RH
Installation and operation guideline:
1, the choice of rated voltage: capacitor rated voltage at least equal to the operating voltage of the capacitor access to the grid, taking into account the impact of the capacitor itself and the network harmonics, should be set aside appropriate margin. This is very important, because the capacitor dielectric voltage is too high, the performance and life of the capacitor will be adversely affected.
2, operating temperature: the temperature of the operation of the capacitor and the ambient temperature should be paid attention, because it has a great impact on the service life of the capacitor, over the upper limit of the temperature will accelerate the electrochemical aging of the media. When setting two or more capacitors, the distance between the >30mm and the summer temperature is too high, we should take effective measures to cool down.
3, over voltage: for easy to be high lightning overvoltage, capacitors should be taken to do the appropriate protection of lightning protection, and as close to the capacitor installation. When the capacitor is connected in the motor, in order to prevent the motor to generate a voltage higher than the voltage from the power supply system of a lot of self-excited cutting, the no-load current recommended capacitor current is less than 90% for general motors, as appropriate.
4, over current: the capacitor must not run in the current more than 1.3 times the rated current. Over current may be caused by a high voltage, harmonic, or both. In order to ensure the service life of the capacitor, even if the current load up to 1.3 times, but still exceeds the rated current value, please caution. The use of power capacitors in a harmonic source network should choose series reactor.
5, the capacitor input and cut out:
A single station device is configured to configure a capacitor, and a capacitor is cut off at the same time as the power switch of the device is cut off.
Two capacitors in the exit after the operation again, in order to prevent the voltage to the capacitor, in 3 minutes before the rear can be put into operation.
Three when the night load is reduced, the terminal voltage of the capacitor may rise very high, should consider the part or all of the capacitor to exit.
6, installation:
When a capacitor is installed, it is best to be more than 30mm.
Two the terminal connection of capacitor is suitable for soft connection.
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