CN220291866U - Control loop for improving switching-on reliability of output switch of 6kV high-voltage frequency converter for factory - Google Patents
Control loop for improving switching-on reliability of output switch of 6kV high-voltage frequency converter for factory Download PDFInfo
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- CN220291866U CN220291866U CN202321952217.3U CN202321952217U CN220291866U CN 220291866 U CN220291866 U CN 220291866U CN 202321952217 U CN202321952217 U CN 202321952217U CN 220291866 U CN220291866 U CN 220291866U
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Abstract
The utility model discloses a control loop for improving the switching-on reliability of an output switch of a 6kV high-voltage frequency converter for a factory, wherein an alternating current power supply is connected with an input end of an auxiliary contact of a local control handle and an input end of an auxiliary contact of a remote control handle, an output end of the auxiliary contact of the local control handle is connected with an input end of a switching-on button and an input end of a switching-off button, an output end of the auxiliary contact of the remote control handle and an output end of the switching-on button are connected with an input end of a normally open auxiliary contact of an input switch, an output end of the normally open auxiliary contact of the input switch is connected with an input end of a normally closed auxiliary contact of a bypass switch of the high-voltage frequency converter, and an output end of the normally closed auxiliary contact of the bypass switch of the high-voltage frequency converter is connected with a switching-on coil in the output switch of the high-voltage frequency converter; the output end of the auxiliary contact of the remote control handle and the output end of the opening button are connected with an opening coil in the output switch of the high-voltage frequency converter, and the circuit can improve the reliability of switching on of the output switch of the high-voltage frequency converter.
Description
Technical Field
The utility model belongs to the field of switching-on design of high-voltage frequency converters, and relates to a control loop for improving switching-on reliability of an output switch of a 6kV high-voltage frequency converter for a factory.
Background
The high-voltage frequency converter is mainly applied to a high-capacity motor powered by a high-voltage power supply for a factory of 6kV or 10kV, is a high-new technology product integrating a power electronic technology, a microelectronic technology, a photoelectric communication technology, a computer technology, an automatic control technology and the like, can be used in industrial environments in various fields, and can meet the requirements of variable-frequency speed regulation and energy conservation of the motor in various complex occasions, so that the stable operation of the high-voltage frequency converter has great contribution to energy conservation in production, and can only be switched to power frequency operation once the frequency converter cannot be started normally, thereby greatly increasing the production cost.
At present, an output switch switching-on loop of a high-voltage frequency converter in a part of thermal power plants adopts a normally open contact of an input switch and a normally closed contact of a bypass switch to drive a locking electromagnet in a switch body to be electrified, so that switching-on of the switch can be realized, but when the frequency converter is started, because the magnetic force change of the electromagnet is unstable and is influenced by factors and residual magnetism of the electromagnet, the situation that the electromagnet is not electrified or a magnetic field is not fully established and the switching-on instruction is disappeared can occur after the input switch is switched on due to shorter switching-on instruction time of the input switch and the output switch, so that switching-on failure of the output switch is caused, and the reliability is poor.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art, and provides a control loop for improving the switching-on reliability of an output switch of a 6kV high-voltage frequency converter for a factory, which can improve the switching-on reliability of the output switch of the high-voltage frequency converter.
In order to achieve the aim, the utility model discloses a control loop for improving the switching-on reliability of an output switch of a 6kV high-voltage frequency converter for a factory, which comprises an alternating current power supply, an on-site control handle auxiliary contact, a remote control handle auxiliary contact, a switching-off button, an input switch normally-open auxiliary contact, a high-voltage frequency converter bypass switch normally-closed auxiliary contact, a switching-on button and a high-voltage frequency converter output switch;
the output end of the remote control handle auxiliary contact and the output end of the switching-on button are connected with the input end of an input switch normally-open auxiliary contact, the output end of the input switch normally-open auxiliary contact is connected with the input end of a high-voltage frequency converter bypass switch normally-closed auxiliary contact, and the output end of the high-voltage frequency converter bypass switch normally-closed auxiliary contact is connected with a switching-on coil in the high-voltage frequency converter output switch;
the output end of the auxiliary contact of the remote control handle and the output end of the opening button are connected with an opening coil in an output switch of the high-voltage frequency converter.
The control circuit comprises a DCS system, and the DCS system is connected with an auxiliary contact of the remote control handle.
The DCS system is connected with the auxiliary contact of the remote control handle through a cable.
The utility model has the following beneficial effects:
when the control loop for improving the switching-on reliability of the output switch of the 6kV high-voltage frequency converter for a factory is specifically operated, the normally-open auxiliary contact of the input switch and the normally-closed auxiliary contact of the bypass switch of the high-voltage frequency converter are directly connected in series into the switching-on loop of the output switch, and the switching-on reliability of the output switch can be greatly improved due to the fact that the hard contact is fast in turnover speed and high in reliability, the hidden danger of frequent starting failure of the frequency converter in the starting process is solved, the switching-on reliability of the output switch of the high-voltage frequency converter is improved, and the control loop is simple in structure, reasonable in design and extremely high in practicability.
Drawings
FIG. 1 is a block diagram of the prior art;
fig. 2 is a structural diagram of the present utility model.
Detailed Description
In order to make the present utility model better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments, but not intended to limit the scope of the present disclosure. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
In the accompanying drawings, there is shown a schematic structural diagram in accordance with a disclosed embodiment of the utility model. The figures are not drawn to scale, wherein certain details are exaggerated for clarity of presentation and may have been omitted. The shapes of the various regions, layers and their relative sizes, positional relationships shown in the drawings are merely exemplary, may in practice deviate due to manufacturing tolerances or technical limitations, and one skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions as actually required.
Referring to fig. 2, the control loop for improving the switching-on reliability of the output switch of the 6kV high-voltage inverter for factories comprises an ac power supply L, an auxiliary contact 303 for an on-site control handle, an auxiliary contact 307 for a remote control handle, a switching-off button 309, a normally open auxiliary contact QF1 for an input switch, a normally closed auxiliary contact QF2 for a bypass switch of the high-voltage inverter, a switching-on button 305 and an output switch QF3 of the high-voltage inverter;
the ac power supply L is connected to the input end of the on-site control handle auxiliary contact 303 and the input end of the remote control handle auxiliary contact 307, the output end of the on-site control handle auxiliary contact 303 is connected to the input end of the on-switch button 305 and the input end of the off-switch button 309, the output end of the remote control handle auxiliary contact 307 and the output end of the on-switch button 305 are connected to the input end of the input switch normally open auxiliary contact QF1, the output end of the input switch normally open auxiliary contact QF1 is connected to the input end of the high-voltage inverter bypass switch normally closed auxiliary contact QF2, and the output end of the high-voltage inverter bypass switch normally closed auxiliary contact QF2 is connected to the on coil in the high-voltage inverter output switch QF 3.
The output end of the auxiliary contact 307 of the remote control handle and the output end of the opening button 309 are connected with the opening coil in the output switch QF3 of the high-voltage inverter.
The working process of the utility model is as follows:
as shown in fig. 2, when the input switch is switched on, the normally open auxiliary contact QF1 of the input switch is turned on, and when the bypass switch is switched off, the normally closed auxiliary contact QF2 of the bypass switch of the high-voltage inverter is turned on, and at this time, when the output switch QF3 of the high-voltage inverter is switched on in situ, the auxiliary contact 303 of the handle and the switch-on button 305 are controlled to be turned on in situ.
When the high-voltage frequency converter output switch QF3 is remotely switched on, the remote control handle auxiliary contact 307 and the switching-on button 305 are conducted, and in two modes, switching-on coils in the high-voltage frequency converter output switch QF3 can be powered on, so that switching-on operation of the high-voltage frequency converter output switch QF3 is realized.
When the input switch is opened, the normally open auxiliary contact QF1 of the input switch is disconnected, or when the bypass switch is closed, the normally closed auxiliary contact QF2 of the bypass switch of the high-voltage frequency converter is disconnected, the closing buttons 305 are disconnected with the closing coils in the output switch QF3 of the high-voltage frequency converter, and the closing coils cannot be electrified, so that the locking logic between the switches is realized.
The utility model can effectively improve the starting success rate of the output switch of the 6kV high-voltage frequency converter, and normally, in the secondary circuit of the 6kV high-voltage frequency converter for factories, the output switch is designed with a locking electromagnet circuit which is driven by a normally open contact of the input switch and a normally closed contact of the bypass switch, when the input switch is closed and the bypass switch is opened, the locking electromagnet is electrified, and at the moment, the output switch can be closed after receiving a closing instruction. Although the mode can prevent the output switch from being switched on by mistake when the frequency converter is not started, the bypass power supply and the output power supply of the frequency converter are prevented from being switched on, but the magnetic force change of the electromagnet is unstable and is influenced by factors and residual magnetism of the electromagnet, when the frequency converter is started, the switching-on failure of the output switch can be caused because the switching-on instruction time of the input switch and the output switch is shorter, after the input switch is switched on, the electromagnet is not powered on or a magnetic field is not fully established, and the switching-on instruction is disappeared. The normally open auxiliary contact QF1 of the input switch and the normally closed auxiliary contact QF2 of the bypass switch of the high-voltage frequency converter are directly connected into the switching-on loop of the output switch in series, and the switching-on reliability of the output switch can be greatly improved due to the high overturning speed of the hard contact, so that the hidden danger of frequent starting failure of the frequency converter in the starting process is solved, and the reliability of the high-voltage frequency converter is ensured. And the wiring of the circuit modification is not complex, the implementation is simple, and the circuit modification has the characteristics of reasonable design, simplicity, reliability and easiness in implementation.
The present utility model and its embodiments have been described above for a simple but non-limiting way, and the utility model can be embodied in other specific forms without departing from the principle of operation or essential characteristics thereof. The drawings are also merely illustrative of one embodiment of the utility model, the actual construction is not limited thereto, and any reference signs in the claims shall not be construed as limiting the scope of the claims concerned. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the control circuit similar to the technical scheme are not creatively designed without departing from the spirit of the present utility model, and all the structural modes and the control circuit are included in the protection scope of the patent of the present utility model.
Claims (3)
1. The control loop is characterized by comprising an alternating current power supply (L), an on-site control handle auxiliary contact (303), a remote control handle auxiliary contact (307), a brake release button (309), an input switch normally open auxiliary contact (QF 1), a high-voltage frequency converter bypass switch normally closed auxiliary contact (QF 2), a brake release button (305) and a high-voltage frequency converter output switch (QF 3);
the alternating current power supply (L) is connected with the input end of the on-site control handle auxiliary contact (303) and the input end of the remote control handle auxiliary contact (307), the output end of the on-site control handle auxiliary contact (303) is connected with the input end of the closing button (305) and the input end of the opening button (309), the output end of the remote control handle auxiliary contact (307) and the output end of the closing button (305) are connected with the input end of the input switch normally open auxiliary contact (QF 1), the output end of the input switch normally open auxiliary contact (QF 1) is connected with the input end of the high-voltage frequency converter bypass switch normally closed auxiliary contact (QF 2), and the output end of the high-voltage frequency converter bypass switch normally closed auxiliary contact (QF 2) is connected with a closing coil in the high-voltage frequency converter output switch (QF 3);
the output end of the auxiliary contact (307) of the remote control handle and the output end of the opening button (309) are connected with an opening coil in the output switch (QF 3) of the high-voltage frequency converter.
2. The control loop for improving switching reliability of an output switch of a 6kV high-voltage inverter for a plant according to claim 1, further comprising a control loop, wherein the control loop comprises a DCS system, and wherein the DCS system is connected to a remote control handle auxiliary contact (307).
3. The control loop for improving switching reliability of an output switch of a 6kV high-voltage frequency converter for a factory according to claim 2, wherein the DCS system is connected with an auxiliary contact (307) of a remote control handle through a cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321952217.3U CN220291866U (en) | 2023-07-21 | 2023-07-21 | Control loop for improving switching-on reliability of output switch of 6kV high-voltage frequency converter for factory |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321952217.3U CN220291866U (en) | 2023-07-21 | 2023-07-21 | Control loop for improving switching-on reliability of output switch of 6kV high-voltage frequency converter for factory |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220291866U true CN220291866U (en) | 2024-01-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321952217.3U Active CN220291866U (en) | 2023-07-21 | 2023-07-21 | Control loop for improving switching-on reliability of output switch of 6kV high-voltage frequency converter for factory |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220291866U (en) |
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2023
- 2023-07-21 CN CN202321952217.3U patent/CN220291866U/en active Active
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