CN109654051B - Power supply switching loop and switching method for heat dissipation fan of high-voltage frequency converter - Google Patents
Power supply switching loop and switching method for heat dissipation fan of high-voltage frequency converter Download PDFInfo
- Publication number
- CN109654051B CN109654051B CN201910159276.7A CN201910159276A CN109654051B CN 109654051 B CN109654051 B CN 109654051B CN 201910159276 A CN201910159276 A CN 201910159276A CN 109654051 B CN109654051 B CN 109654051B
- Authority
- CN
- China
- Prior art keywords
- power supply
- phase
- contactors
- power
- frequency converter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 8
- 230000017525 heat dissipation Effects 0.000 title claims description 11
- 238000001816 cooling Methods 0.000 claims abstract description 32
- 238000012544 monitoring process Methods 0.000 claims description 14
- 230000001681 protective effect Effects 0.000 description 5
- 230000033228 biological regulation Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
- F04D25/166—Combinations of two or more pumps ; Producing two or more separate gas flows using fans
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/002—Details, component parts, or accessories especially adapted for elastic fluid pumps
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a power supply switching loop and a switching method of a high-voltage frequency converter cooling fan, which belong to the field of power electronics and aim at the problem that the switching cannot be performed when a single-phase failure occurs on the basis of the power supply switching loop of the high-voltage frequency converter cooling fan in the prior art. The device can ensure timely switching when a single-phase failure occurs, and the power supply of the cooling fan can reliably alarm when a fault occurs, thereby ensuring the stable operation of a cooling system of the frequency converter.
Description
Technical Field
The invention relates to the field of power electronics, in particular to a power supply switching loop and a switching method of a cooling fan of a high-voltage frequency converter.
Background
The frequency converter is an electric energy control device which converts a power frequency power supply into another frequency by utilizing the on-off action of a power semiconductor device. With the rapid development of modern power electronic technology and microelectronic technology, high-voltage high-power variable-frequency speed regulation devices are continuously mature, and the high-voltage problem which is difficult to solve originally is solved well in recent years by device series connection or unit series connection. The high-voltage high-power variable-frequency speed regulation device is widely applied to various fans, water pumps, compressors, rolling mills and the like in industries such as large-scale mining production plants, petrochemical industry, municipal water supply, metallurgical steel, electric power energy and the like. Meanwhile, heat dissipation is also an important part in the design of the high-voltage frequency converter.
The heat dissipation of high-voltage inverter generally adopts radiator fan to go on, but current high-voltage inverter radiator fan control circuit generally adopts main power supply all the way and stand-by power supply all the way to supply power. Due to long-time operation and environmental influence, the heat dissipation extension power supply is out of standby due to tripping of a superior switch or overcurrent tripping of the switch caused by poor contact. The cooling fan power supply switching loop can be switched to a standby power supply under the condition that a main power supply is lost, but the cooling fan power supply switching loop can only be switched under the condition that the main power supply loses three phases, and cannot be switched when the main power supply loses phases. The cooling fan power supply can not be switched to the standby power supply. The shutdown after the heat radiation fan loses power can lead to the temperature rise of the frequency converter, and finally the frequency converter trips due to the high-temperature and heavy fault of the frequency converter, so that the stable operation of the high-voltage frequency converter is seriously influenced.
Chinese patent application 201520571747.2, published 2015 year 11 month 18 days, an improved generation converter is disclosed, including protective housing, the radiator, the energy storage battery, emergent switching circuit, data control circuit, control panel, binding post, frequency conversion module, drive circuit, control circuit, power modulation circuit, wherein the energy storage battery, emergent switching circuit, the data control circuit, frequency conversion module, drive circuit, control circuit, power modulation circuit all is located protective housing inside, the radiator is located protective housing surface and is connected with protective housing through the heat-conducting plate, control panel and binding post inlay in protective housing outward appearance, wherein control panel and control circuit electrical connection. According to the scheme, on one hand, the structure of the frequency converter is effectively simplified, on the other hand, the heat dissipation capacity of the frequency converter is improved, so that the operation stability of the frequency converter is improved, meanwhile, the continuous operation capacity after power failure is additionally provided, and the operation reliability and safety of the frequency converter are greatly improved. But its structure is complicated, and the switching effect is not good, under whole cooling fan power switching condition, is not fit for.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problem that the switching can not be carried out when a single-phase failure occurs on the basis of a high-voltage frequency converter cooling fan power supply switching loop in the prior art, the invention provides the high-voltage frequency converter cooling fan power supply switching loop and the switching method, which can ensure the timely switching when the single-phase failure occurs, can reliably alarm when a cooling fan power supply fails, and ensure the stable operation of a frequency converter cooling system.
2. Technical scheme
The purpose of the invention is realized by the following technical scheme.
A high-voltage frequency converter cooling fan power supply switching loop comprises 2 power supplies for supplying power to a cooling fan, wherein the two power supplies are respectively connected with two contactors, contactor coils of respective phases are respectively connected in parallel between terminals of a phase A, a phase N, a phase B and the phase N and a phase C and the phase N, two contactors KM01 and KM001 connected with a first power supply are connected with the power supplies, contactor coils are respectively connected in parallel between terminals of the phase A, the phase N, the phase B and the phase N and the phase C and the phase N, a contactor coil is respectively connected in parallel between terminals of the phase A, the phase B, the phase C and the phase N, two contactors KM002 and KM02 and KM002 connected with a second power supply are connected with terminals of any contactor 35A, B, C and one terminal of the two contactors connected with the first power supply, and normally closed.
Further, the relays connected in parallel between the two contactors of the second power supply connection and the one terminals of the two contactors of the first power supply connection are three power supply monitor relays of A, B, C phases.
Furthermore, the coil terminal of the contactor with the first power supply and the second power supply connected in parallel is connected with the background fault alarm signal port.
Furthermore, the power supply is a three-phase four-wire 380V power supply.
Furthermore, the two power supplies are respectively connected with the two contactors to switch the power supply of the fan.
Furthermore, a connecting terminal and a coil terminal of the two contactors connected with the first power supply are respectively connected with two ends of a normally closed terminal of the second power supply.
Furthermore, the lower ends of the two power supplies are respectively provided with a switch.
Based on any of the above, the method for switching the power supply switching loop of the cooling fan of the high-voltage frequency converter comprises the following steps:
when a certain power supply loses voltage or is in single-phase loss, namely three-phase voltage at the lower end of a power switch is zero or one phase is zero, a coil of a first contactor corresponding to the power supply and one coil of a power supply monitoring relay of the power supply lose power, and one of the coil of the first contactor and a normally closed node of the power supply monitoring relay is closed;
when the three-phase voltage at the lower end of the other power supply is normal, the corresponding two contactor coils are electrified, the two contactors are closed, the power supply of the cooling fan is switched to the other power supply, and meanwhile, one normally closed node of the power supply monitoring relay sends a signal to the background to generate a main power supply alarm.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
compared with the switching loop of the heat dissipation fan of the high-voltage frequency converter, the switching loop of the heat dissipation fan of the high-voltage frequency converter can monitor the running state in real time, find faults in time and process defects with sufficient time. The problem that the frequency converter cannot be switched to standby in time due to single-phase loss in the operation of the previous frequency converter is avoided, and the frequency converter is stopped due to the fact that the temperature of the frequency converter rises due to poor heat dissipation is avoided.
Drawings
FIG. 1 is a main circuit diagram of a power supply of a cooling fan;
fig. 2 is a circuit diagram of a power supply signal of the cooling fan.
Detailed Description
The invention is described in detail below with reference to the drawings and specific examples.
As shown in fig. 1 and 2, the scheme provides a power supply switching loop of a cooling fan of a high-voltage frequency converter, which comprises 2 power supplies for supplying power to the cooling fan, wherein the power supplies are three-phase four-wire 380V power supplies. The lower ends of the two power supplies are respectively provided with a switch.
The two power supplies are respectively connected with two contactors, wherein the two contactors KM01 and KM001 connected with the first power supply are respectively connected with contactor coils of respective phases between terminals of A phase and N phase, B phase and N phase, and C phase and N phase of the power supplies in parallel, the first contactor KM002 connected with the second power supply is respectively connected with contactor coils in parallel between terminals of A phase and N phase, B phase and N phase, and C phase and N phase of the power supplies, and normally closed nodes of a three-phase power supply monitoring relay are connected in parallel between terminals connected with any A, B, C in the two contactors KM02 and KM002 connected with the second power supply and one terminal of the two contactors connected with the first power supply. The relays connected in parallel between the two contactors of the second power supply connection and one terminal of the two contactors of the first power supply connection are three power supply monitor relays of A, B, C phases.
And the coil terminal of the contactor, which is connected with the first power supply and the second power supply in parallel, is connected with the background fault alarm signal port. The two power supplies are respectively connected with the two contactors to switch the power supply of the fan. One connecting terminal and a coil terminal of the two contactors connected by the first power supply are respectively connected with two ends of a normally closed terminal of the second power supply.
When the power supply is in a voltage loss state or a single-phase loss state, namely three-phase voltage at the lower end of a power switch is zero or one phase is zero, a coil of a first contactor corresponding to the power supply and one coil of a power supply monitoring relay of the power supply lose power, and one of the coil of the first contactor and a normally closed node of the power supply monitoring relay is closed;
when the three-phase voltage at the lower end of the other power supply is normal, the corresponding two contactor coils are electrified, the two contactors are closed, the power supply of the cooling fan is switched to the other power supply, and meanwhile, one normally closed node of the power supply monitoring relay sends a signal to the background to generate a main power supply alarm.
The circuit can ensure timely switching during single-phase failure, and the power supply of the cooling fan can reliably alarm when a fault occurs, thereby ensuring the stable operation of a cooling system of the frequency converter.
Example 1
In the following specific embodiment, as shown in fig. 1 and 2, a main power supply and a standby power supply are provided, wherein KA72, KA82, KA92, KA74, KA84 and KA94 are power circuit monitoring relay coils, and KM01, KM02, KM001 and KM002 are fan power switching contactors.
The frequency converter cooling fan is powered by a main power supply and a standby power supply, the main power supply is normally powered, when the main power supply is in voltage loss or single-phase loss, namely three-phase voltage at the lower end of a QS1 fast-dividing switch is zero or one phase is zero, a coil of a contactor KM01 and one coil of main power supply monitoring relays KA72, KA82 and KA92 are powered off, one of normally closed nodes of a contactor KM01 and relays KA72, KA82 and KA92 is closed, when the three-phase voltage at the lower end of QS2 is normal, coils of contactors KM02 and 002 are electrified, contactors KM02 and KM002 are attracted, and the cooling fan power supply is switched to the standby power supply. Meanwhile, one of normally closed nodes of KA72, KA82 and KA92 signals the background to generate a main power supply alarm.
Similarly, when the fan is powered by the standby power supply, and when the standby power supply is in voltage loss or single-phase loss, namely three-phase voltage at the lower end of the fast branch of the QS2 is zero or one phase is zero, the coil of the contactor KM02 and one coil of the main power supply monitoring relays KA74, KA84 and KA94 are powered off, one of the normally closed nodes of the contactor KM02 and the relays KA74, KA84 and KA94 is closed, when the three-phase voltage at the lower end of the QS1 is normal, the coils of the contactors KM01 and KM001 are electrified, the contactors KM01 and KM001 attract each other, and the heat dissipation fan power supply is switched to the main power supply. Meanwhile, one of normally closed nodes of KA74, KA84 and KA94 signals the background to generate a standby power alarm.
The invention and its embodiments have been described above schematically, without limitation, and the invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The representation in the drawings is only one of the embodiments of the invention, the actual construction is not limited thereto, and any reference signs in the claims shall not limit the claims concerned. Therefore, if a person skilled in the art receives the teachings of the present invention, without inventive design, a similar structure and an embodiment to the above technical solution should be covered by the protection scope of the present patent. Furthermore, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. Several of the elements recited in the product claims may also be implemented by one element in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
Claims (4)
1. The utility model provides a high-voltage inverter cooling fan power switching return circuit which characterized in that: comprises a first power supply and a second power supply for supplying power to a cooling fan, wherein the lower ends of the two power supplies are respectively provided with a switch, the first power supply and the second power supply are respectively connected with two contactors, the two contactors KM01 and KM001 connected with the first power supply are connected with terminals of an A phase and an N phase, a B phase and an N phase of the power supply, and terminals of a C phase and the N phase of the power supply in parallel respectively, the first contactor KM002 connected with the second power supply is connected with terminals of the A phase and the N phase, the B phase and the N phase, and terminals of the C phase and the N phase of the power supply in parallel respectively, contactor coils are connected in parallel between terminals connected with any A, B, C in the two contactors KM02 and KM002 connected with the second power supply and one terminal of the two contactors connected with the first power supply, and the contactor coils are connected with a power failure alarm device of the cooling fan respectively; the relays connected in parallel between the two contactors connected with the second power supply and one terminal of the two contactors connected with the first power supply are A, B, C-phase three power supply monitoring relays; one connecting terminal and a coil terminal of two contactors connected with a first power supply are respectively connected with two ends of a normally closed terminal of a second power supply; the two power supplies are respectively connected with the two contactors to switch the power supply of the fan.
2. The power supply switching loop of the heat dissipation fan of the high-voltage frequency converter as claimed in claim 1, wherein: and the contactor coil terminal of the first power supply and the second power supply which are connected in parallel is connected with the background fault alarm signal port.
3. The power supply switching loop of the cooling fan of the high-voltage frequency converter is characterized in that: the first power supply and the second power supply are three-phase four-wire 380V power supplies.
4. The method for switching the power supply switching loop of the cooling fan of the high-voltage frequency converter based on any one of claims 1 to 3 comprises the following steps:
when a certain power supply loses voltage or is in single-phase loss, namely three-phase voltage at the lower end of a power switch is zero or one phase is zero, a coil of a first contactor corresponding to the power supply and one coil of a power supply monitoring relay of the power supply lose power, and one of the coil of the first contactor and a normally closed node of the power supply monitoring relay is closed;
when the three-phase voltage at the lower end of the other power supply is normal, the corresponding two contactor coils are electrified, the two contactors are closed, the power supply of the cooling fan is switched to the other power supply, and meanwhile, one normally closed node of the power supply monitoring relay sends a signal to the background to generate a main power supply alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910159276.7A CN109654051B (en) | 2019-03-04 | 2019-03-04 | Power supply switching loop and switching method for heat dissipation fan of high-voltage frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910159276.7A CN109654051B (en) | 2019-03-04 | 2019-03-04 | Power supply switching loop and switching method for heat dissipation fan of high-voltage frequency converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109654051A CN109654051A (en) | 2019-04-19 |
| CN109654051B true CN109654051B (en) | 2020-10-02 |
Family
ID=66123895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910159276.7A Expired - Fee Related CN109654051B (en) | 2019-03-04 | 2019-03-04 | Power supply switching loop and switching method for heat dissipation fan of high-voltage frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109654051B (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2580660Y (en) * | 2002-10-08 | 2003-10-15 | 王志林 | Double power-supply control device |
| CN2741256Y (en) * | 2004-07-14 | 2005-11-16 | 中国洛阳浮法玻璃集团有限责任公司 | Sigle load-double power supply switching controller with phase-off protecter |
| KR100973546B1 (en) * | 2008-06-09 | 2010-08-02 | 한국전력공사 | A Replacement system of Distribution Transformers and Line without Outage by power bypass device |
| CN201928080U (en) * | 2011-01-21 | 2011-08-10 | 北京津宇嘉信科技开发有限公司 | Power supply detecting and switching device |
| CN202840676U (en) * | 2012-10-26 | 2013-03-27 | 张志强 | Low-voltage double-power-supply automatic switching device |
| CN204167997U (en) * | 2014-10-21 | 2015-02-18 | 广东易事特电源股份有限公司 | Double supply automatic switch-over circuit |
| CN205901423U (en) * | 2016-07-27 | 2017-01-18 | 广西桂冠开投电力有限责任公司 | Contactor type dual -power -supply switching device with wrong looks, open -phase protection function |
| CN209621696U (en) * | 2019-03-04 | 2019-11-12 | 大唐华银电力股份有限公司金竹山火力发电分公司 | A kind of high-voltage frequency converter cooling fan power supply switching circuit |
-
2019
- 2019-03-04 CN CN201910159276.7A patent/CN109654051B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN109654051A (en) | 2019-04-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103066684A (en) | High voltage direct current power supply system | |
| CN102664454B (en) | Non-floating charging type substation direct current power supply system based on iron lithium battery | |
| CN110912109A (en) | Low-voltage direct-current power supply and distribution equipment and method | |
| CN215300162U (en) | Low-voltage transformer area load uninterrupted switching system | |
| CN203104085U (en) | High-voltage direct-current power supply system | |
| CN109654051B (en) | Power supply switching loop and switching method for heat dissipation fan of high-voltage frequency converter | |
| CN202906774U (en) | High-power photovoltaic inverter with automatic power-off auxiliary power supply circuit | |
| CN205029421U (en) | Power supply switching device | |
| CN202550664U (en) | Direct current power supply system of non-floating charge type transformer substation based on lithium iron battery | |
| CN209621696U (en) | A kind of high-voltage frequency converter cooling fan power supply switching circuit | |
| CN209860776U (en) | Topological structure of auxiliary power supply of water-cooling high-voltage frequency converter | |
| CN203632351U (en) | Double-power-source switching device | |
| CN203456874U (en) | Serial-connection type voltage compensation antagonistic apparatus | |
| CN107769195B (en) | Forced flow conversion type mechanical switch based on LC oscillation, device and control method | |
| CN204858730U (en) | 10KV switch board secondary circuit voltage seamless handover device | |
| CN220291723U (en) | Coupling reactor cabinet circuit capable of improving zero sequence non-current sharing and waveform distortion | |
| CN214590611U (en) | System for reducing starting and standby variable air load loss of power plant | |
| CN219717935U (en) | Voltage sag protection device suitable for direct-current bus end of low-voltage frequency converter | |
| CN208723619U (en) | A kind of industrial drives uninterruptible power system of protection operation in parallel | |
| CN216250427U (en) | Low-voltage reactive compensation capacitor device with temperature control detection function | |
| CN114566953B (en) | Buffer circuit and grid-connected system | |
| CN214154011U (en) | Self-recovery fast current-limiting switch cabinet | |
| CN213899252U (en) | Auxiliary air compressor protection device, circuit and train | |
| CN216436874U (en) | Prevent that motor circuit from shaking electricity, losing power's anti-power-off circuit | |
| CN204721073U (en) | A kind of DC power supply DC-BANK |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201002 Termination date: 20210304 |