The role of damping resistance In order to effectively absorb the higher harmonic components of the secondary circuit of the rectifier transformer and prevent the resonance of the output circuit, effectively protect the rectifier transformer, damping resistors must be installed at the output end of the rectifier transformer. In any case, it is absolutely not allowed to connect the rectifier transformer output directly to the electric field without damping resistance.
The high-voltage damping resistor is installed between the rectified high-voltage output and the electric field inlet. It is recommended that it be installed on the contact (vertical suspension) of the isolation switch in the high-voltage isolation switchgear or on the bushing before the electric field. Because the high-voltage damping resistor will work, it should not be installed on the copper screw of the rectification high-voltage output terminal to avoid affecting the life of the rubber ring of the high-pressure output end. In severe cases, it will leak oil. Pay attention to the distance from the side shell and other equipment during installation to prevent discharge.
High-Voltage Damping Resistance | Damping Resistance Role Selection Reference
0.1-0.4A rectification change 2KΩ/500W (outline figure 1)
0.6-0.8A rectification change 1KΩ/1200W (outline figure 1)
1.0-1.6A rectification 700Ω/2800W (outline drawing 1)
1.8-2.0A rectification 500Ω/3000W (outline figure 2)
At present, there is no uniform standard in the country for the parameters of the damping resistance of the electrostatic precipitator rectifier transformer. The rated power of the damping resistor must be greater than the product of its resistance value and the square of the secondary rated current, and there must be a certain safety margin.
At present, damping resistors installed in the field are installed between the rectifier transformer output and the high-voltage isolation switch, and some are installed between the high-voltage isolation switch and high-voltage electric field introduction. Theoretically, these two kinds of connections are can. However, considering the convenience and safety of overhauling and replacing the damping resistor, it is better to connect the damping resistance between the output of the rectifier transformer and the high-voltage isolation switch. When the damping resistance at the output end of a certain rectifier transformer needs to be repaired or replaced, it is only necessary to power off the electric field. After the isolating switch is placed in the “earthing” position, the damping resistor can be reliably shielded and the personal safety can be ensured. The remaining adjacent electric fields can continue to operate. Because the electrostatic precipitator is often operated in series with several electric fields, if the high voltage damping resistor is connected between the isolating switch and the electric field high voltage introduction, even if the isolating switch is placed in the “earth” position after the electric field is cut off, the electric field generated by the adjacent running is charged. Ions can still be connected to the damping resistor.
As we all know, the complete disconnection of the damping resistor will lead to "open circuit output" and the electric field will drop out. This situation is very obvious and very easy to judge. However, when the end of the damping resistor or somewhere in the middle falls off and the end of the resistance wire approaches “ground”, a corona discharge occurs from there to the ground. The result of the metering is very similar to the normal operation of the electric field. When checking the device, listen carefully to the sound of the discharge. If there is a discharge at the damping resistor, it must be dealt with promptly.
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