CN215452824U - Energy-unloading type independent power-on system in direct-current bus power supply system - Google Patents
Energy-unloading type independent power-on system in direct-current bus power supply system Download PDFInfo
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- CN215452824U CN215452824U CN202121285368.9U CN202121285368U CN215452824U CN 215452824 U CN215452824 U CN 215452824U CN 202121285368 U CN202121285368 U CN 202121285368U CN 215452824 U CN215452824 U CN 215452824U
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Abstract
The utility model relates to the technical field of power systems, in particular to an energy-unloading type independent power-on system in a direct-current bus power supply system, which comprises: the frequency converter is respectively in communication connection with the encoder, the digital input and the DP; the UDC + and the UDC-end of the frequency converter are respectively connected with the DC + and the DC-through an isolation type fusing switch, and an energy unloading diode is arranged between the UDC + and the isolation type fusing switch; the PE end of the frequency converter is connected with a PE circuit; the output end of the frequency converter is connected with the motor; the DC + is connected with L1/L2/L3 of the frequency converter through the isolation type fusing switch; the internal power supply of the frequency converter is connected with the operation end; and the input end of the main contactor is connected with a three-phase power supply, and the output end of the main contactor is connected with a cooling fan. The utility model utilizes an external fast fuse, namely a direct current bus independent charging system consisting of a fuse type isolating switch, a fast fuse core and an energy-releasing diode.
Description
Technical Field
The utility model relates to the technical field of power systems, in particular to an energy-unloading type independent power-on system in a direct-current bus power supply system.
Background
In the transmission of the existing steel rolling wire and paper making machine, because the whole variable frequency transmission control system needs several or dozens of frequency converters (or inverters) to operate in the same direct current bus power supply system, the problem of overvoltage alarm caused by overhigh voltage of a direct current bus inside the frequency converter due to dragging of partial frequency converters possibly occurs in the operation process of each motor (variable frequency) is solved.
In the variable-frequency transmission direct-current bus power supply system, a primary loop connected into a frequency converter is not an R, S, T three-phase input terminal any more, but a UDC + and UDC-direct-current input terminal in the frequency converter, and before power is supplied, because a capacitor in the frequency converter is not charged and the positive and negative electrodes of the capacitor are not provided with voltage, the voltage of the DC510V or DC930V is equivalent to short circuit. Direct application of the electrodes may cause fast fuse burn-out and inverter explosion problems, and may cause electrical arcing to harm people.
What needs to be solved is therefore the problem of power-up (charging) of the frequency converter, otherwise the problem of frequency converter explosion is very likely to occur. At present, almost all transmission control complete suppliers adopt a centralized charging mode.
The mode of centralized charging of the direct current bus is feasible, but the steel rolling wire and the paper making production line are continuously produced for 24 hours, and the frequency converter can be out of order in long-term operation, so that the frequency converter with the failure needs to be replaced. At the moment, the defect of centralized charging of the direct-current bus appears immediately, the whole production line is required to be completely powered off, and the whole production line can be powered on again after the fault frequency converter is replaced. The operation also needs 30 minutes to 1 hour (the power of the frequency converter is different, and the replacement is difficult and easy) to complete at the fastest speed.
In the paper making production line, because the transmission motor stops running, the drying cylinder must be stopped to supply steam and the like, the temperature of the drying cylinder is reduced at the moment, the drying cylinder needs to be heated again after the frequency converter is replaced, the great energy loss is caused, and the manpower and material resources loss of thousands of yuan to tens of thousands of yuan is caused by one-time frequency converter fault shutdown of the paper machine according to incomplete statistics.
SUMMERY OF THE UTILITY MODEL
The utility model provides an energy-discharging independent power-on system in a direct-current bus power supply system, which utilizes an external quick fuse, namely a direct-current bus independent charging system consisting of a fuse disconnecting switch, a quick fuse core and an energy-discharging diode.
In order to achieve the purpose, the utility model provides the following technical scheme: an energy-unloading independent power-on system in a direct-current bus power supply system comprises: the frequency converter is respectively in communication connection with the encoder, the digital input and the DP; the UDC + and the UDC-end of the frequency converter are respectively connected with the DC + and the DC-through an isolation type fusing switch, and an energy unloading diode is arranged between the UDC + and the isolation type fusing switch; the PE end of the frequency converter is connected with a PE circuit; the output end of the frequency converter is connected with the motor; the DC + is connected with L1/L2/L3 of the frequency converter through the isolation type fusing switch; the internal power supply of the frequency converter is connected with the operation end; and the input end of the main contactor is connected with a three-phase power supply, and the output end of the main contactor is connected with a cooling fan.
Preferably, the three-phase unit further comprises an in-cabinet lighting, and the in-cabinet lighting is connected with any one of the three-phase units through the main contactor.
The utility model has the beneficial effects that:
the frequency converter has the advantages that a certain frequency converter can be freely replaced or maintained as required, other frequency converters in the same system cannot be affected, and the power failure of the whole system is not needed.
Secondly because the electricity mode is nimble, swift, consequently changing the converter in-process, each driving point of paper machine is in crawling, like the state of low-speed 25 meters/minute, and the dryer is in the heat preservation state, waits the converter to change the back that finishes, can directly go up the electricity production, the energy saving loss greatly.
The problem that the frequency converter is exploded due to blind electrification caused by unclear circuit principles of electric appliance maintenance personnel is completely solved, loss is avoided, and electric arcs are prevented from hurting people.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a wiring diagram of the frequency converter of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an energy-discharging independent power-on system in a dc bus power supply system includes: the frequency converter is respectively in communication connection with the encoder, the digital input and the DP; the UDC + and the UDC-end of the frequency converter are respectively connected with the DC + and the DC-through an isolation type fusing switch, and an energy unloading diode is arranged between the UDC + and the isolation type fusing switch; the PE end of the frequency converter is connected with a PE circuit; the output end of the frequency converter is connected with the motor; the DC + is connected with L1/L2/L3 of the frequency converter through the isolation type fusing switch; the internal power supply of the frequency converter is connected with the operation end; and the input end of the main contactor is connected with a three-phase power supply, and the output end of the main contactor is connected with a cooling fan.
In the above arrangement, the external fast fuse, including the fuse-type isolating switch, the fast fuse core and the energy-releasing diode, form the dc bus independent charging system.
The protection function is formed for the frequency converter by utilizing the performance of quick fusing of the quick fuse, the isolating switch with the fusing function and the quick fuse core.
The original R, S, T of the frequency converter is used in parallel, and the positive electrode of a direct-current bus power supply is directly connected to R, S, T through a quick fuse; the negative pole of the power supply is connected to the UDC-of the direct current bus inside the frequency converter through the fast fuse. Charging by using an original charging system of the frequency converter; after charging, the frequency converter can operate with a motor.
And the phenomenon that the motor is dragged inevitably occurs at a driven point of load distribution, a rear drying cylinder of a paper machine and the like in the operation process of the motor, and the voltage of a direct-current bus inside the frequency converter is increased, so that overvoltage alarm of the frequency converter or breakdown of a direct-current bus capacitor can be caused to explode the machine.
And fourthly, connecting a terminal UDC + of a direct-current busbar inside the frequency converter in series with a forward energy-leakage diode module to be linked to R, S, T of the frequency converter. When the power is on, the direct current power supply charges through R, S, T of the frequency converter and an internal charging loop of the frequency converter; when the motor is dragged, the energy in the frequency converter is transmitted to the direct-current power supply busbar through the energy-discharging diode to be used by other frequency converters, so that the overvoltage alarm or the machine explosion risk of the frequency converter is avoided.
In order to perfect the equipment, the equipment also comprises an internal cabinet lighting which is connected with any one of the three-phase units through the main contactor.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (2)
1. An energy-unloading type independent power-on system in a direct-current bus power supply system is characterized by comprising:
the frequency converter is respectively in communication connection with the encoder, the digital input and the DP; the UDC + and the UDC-end of the frequency converter are respectively connected with the DC + and the DC-through an isolation type fusing switch, and an energy unloading diode is arranged between the UDC + and the isolation type fusing switch; the PE end of the frequency converter is connected with a PE circuit; the output end of the frequency converter is connected with the motor; the DC + is connected with L1/L2/L3 of the frequency converter through the isolation type fusing switch; the internal power supply of the frequency converter is connected with the operation end;
and the input end of the main contactor is connected with a three-phase power supply, and the output end of the main contactor is connected with a cooling fan.
2. The energy-unloading independent power-on system in the direct-current bus power supply system according to claim 1, characterized in that: the intelligent cabinet is characterized by further comprising cabinet interior illumination, wherein the cabinet interior illumination is connected with any one of the three-phase power supplies through the main contactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121285368.9U CN215452824U (en) | 2021-06-09 | 2021-06-09 | Energy-unloading type independent power-on system in direct-current bus power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121285368.9U CN215452824U (en) | 2021-06-09 | 2021-06-09 | Energy-unloading type independent power-on system in direct-current bus power supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215452824U true CN215452824U (en) | 2022-01-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121285368.9U Active CN215452824U (en) | 2021-06-09 | 2021-06-09 | Energy-unloading type independent power-on system in direct-current bus power supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215452824U (en) |
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2021
- 2021-06-09 CN CN202121285368.9U patent/CN215452824U/en active Active
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