Medium-frequency Furnace Passive Filter Energy-Saving Compensation Device
Short Description:
Medium-frequency furnaces are nonlinear loads that inject harmonic currents into the power grid during operation, generating harmonic voltages across the grid impedance, which leads to voltage distortion in the grid and affects power quality and equipment operating safety. The natural power factor of high-power medium-frequency furnaces is between 0.8 and 0.85, with a high reactive power demand and a high harmonic content. The natural power factor of low-power medium-frequency furnaces is between 0.88 and 0.92, with a low reactive power demand, but the total harmonic content is very high. The main harmonics on the grid side of medium-frequency furnaces are the 5th, 7th, and 11th.
Product details
Product Overview:
The intermediate frequency furnace is a nonlinear load, which injects harmonic current into the power grid during operation, generating harmonic voltage on the grid impedance, resulting in grid voltage distortion, affecting the power supply quality and equipment operation safety. The natural power factor of high-power intermediate frequency furnaces is between 0.8 and .85, with large reactive power demand and high harmonic content. The natural power factor of the low-power intermediate frequency furnace is between 0.88-0.92, and the reactive power demand is small, but the harmonic sum is very high. The network-side harmonics of the intermediate frequency furnace are mainly 5, 7 and 11.
In order to ensure the quality of electrical power, harmonic suppression measures need to be taken while compensating for reactive power. According to our country's power quality standards, as well as the company's research results in harmonic control in recent years, the use of broadband filtering technology is used to set up filter loops for the characteristic harmonics generated by the intermediate frequency furnace, absorb the harmonic current, improve the power quality, and completely solve the damage caused by the power quality of the intermediate frequency furnace, UPS power supply, CNC machine tools, frequency converters and other sensitive loads, in addition, it can also shorten the smelting time and bring energy-saving benefits to users.
The connection of the intermediate frequency furnace filter can use high-pressure filtering or low-voltage side in-situ filtering, according to the harmonic principle and harmonic power flow analysis, the installation on the low-voltage side has obvious advantages, mainly as;
1) Harmonic current is absorbed nearby on the low-voltage side to avoid flowing into the high-voltage system, reducing losses and faults on the rectifier transformer.
2) For the unit filtering of a single transformer, the control method is simple and reliable, and the dynamic switching follows the load change of the intermediate frequency furnace.
3) The low-pressure filtering equipment is easy to maintain.
4) The price of low-pressure filtering is lower than that of high-pressure filtering.
Implementation and reference standards
The manufacturing, testing and acceptance of equipment should comply with the following standards of our company:
GB/14549-1993 "Harmonics of Electric Power Quality Utility Grid"
G/T 12325-2008 "Allowable Deviation of Power Quality Supply Voltage"
GB50227-95 Design Code for Shunt Capacitor Devices
GB 10229-88 "Reactors"
DL/XIA 653-1998 "Technical Conditions for Ordering Discharge Coils for High Voltage Shunt Capacitors"
GB/11032-2000 "AC Gapless Metal Oxide Arresters".
Product features:
This device is an indoor cabinet structure, and the main components installed in the cabinet such as contactors, reactors, capacitors, instruments, discharge coils, lightning arresters, etc. are all customized by Bohong Company according to the characteristics of user working conditions. Effectively ensure the effectiveness of use.
In order to ensure personal safety, each cabinet panel is pasted with warning words such as precautions and high voltage dangers, and is equipped with electrical and mechanical locking functions.
The automatic reactive power controller can automatically input the capacitor branch according to the load situation and automatically adjust the power factor.
A special discharger is installed to reduce the residual voltage of the capacitor to less than 10% of the rated voltage for 5 seconds after the capacitor is disconnected from the power supply.
The structure design is reasonable, and the installation and maintenance are convenient. Specially designed circuits will not affect the normal production of other equipment under any circumstances.
Automatic control: equipped with a total switch, a special contactor, which can be frequently switched.
Manual control: Equipped with a total switch to meet the requirements of filtering and power saving.
Technical characteristics:
Rated voltage: 400V, 525V, 660V, 750V, 1000V
Rated power: 120-20000KVAR.
Harmonic filtering rate: not lower than the national standard.
Power factor: 0.90---0.99.
Harmonic ratio: 1:1
Filtering equipment environmental conditions
Installation location: indoor.
Designed indoor high temperature: +45°C
Design indoor low temperature: -15°C.
Design indoor relative humidity: 95%
Product features:
This device is an indoor cabinet structure, and the main components installed in the cabinet such as contactors, reactors, capacitors, instruments, discharge coils, lightning arresters, etc. are all customized by Bohong Company according to the characteristics of user working conditions. Effectively ensure the effectiveness of use.
In order to ensure personal safety, each cabinet panel is pasted with warning words such as precautions and high voltage dangers, and is equipped with electrical and mechanical locking functions.
The automatic reactive power controller can automatically input the capacitor branch according to the load situation and automatically adjust the power factor.
A special discharger is installed to reduce the residual voltage of the capacitor to less than 10% of the rated voltage for 5 seconds after the capacitor is disconnected from the power supply.
The structure design is reasonable, and the installation and maintenance are convenient. Specially designed circuits will not affect the normal production of other equipment under any circumstances.
Automatic control: equipped with a total switch, a special contactor, which can be frequently switched.
Manual control: Equipped with a total switch to meet the requirements of filtering and power saving.
Technical characteristics:
Rated voltage: 400V, 525V, 660V, 750V, 1000V
Rated power: 120-20000KVAR.
Harmonic filtering rate: not lower than the national standard.
Power factor: 0.90---0.99.
Harmonic ratio: 1:1
Filtering equipment environmental conditions
Installation location: indoor.
Designed indoor high temperature: +45°C
Design indoor low temperature: -15°C
Design indoor relative humidity: 95%
