CN202634265U - Optimized circuit of air-cooling frequency converter for thermal power plant - Google Patents
Optimized circuit of air-cooling frequency converter for thermal power plant Download PDFInfo
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- CN202634265U CN202634265U CN2012203289700U CN201220328970U CN202634265U CN 202634265 U CN202634265 U CN 202634265U CN 2012203289700 U CN2012203289700 U CN 2012203289700U CN 201220328970 U CN201220328970 U CN 201220328970U CN 202634265 U CN202634265 U CN 202634265U
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Abstract
The utility model discloses an optimized circuit of an air-cooling frequency converter for a thermal power plant. The circuit comprises a local relay, a remote relay and a frequency converter relay, wherein the local relay and the remote relay are connected in parallel and then connected with the frequency converter relay; the output terminals of the local relay and the remote relay are connected in parallel with a local relay switch and a remote relay switch; a frequency converter relay switch A and a frequency converter relay switch B of the frequency converter relay are connected in series with the local relay switch and the remote relay switch respectively; both terminals of the frequency converter relay are connected in parallel with delay relays; and delay relay switches are connected in parallel with the frequency converter relay switch B. In a low voltage plant, the extreme and long-time fluctuation of the bus voltage occurs when a power supply is used for switching or starting large capacity motors, while an air-cooling frequency conversion blower can realize automatic startup, thereby reducing disturbance to the back pressure of a steam turbine, reducing hidden troubles for the safe running of machine sets, and improving the economy and the stability of the machine sets.
Description
Technical field
The utility model relates to power domain, is specifically related to a kind of structure of voltage fluctuation when optimizing thermal power plant air cooling frequency converter bus and switching.
Background technology
The rotational speed regulation of air cooled generator unit blower fan and ambient air temperature, turbine discharge back pressure, the water temperature of condensing are combined closely, and the reliability of converter plant has very important relation to the safe operation of unit.
Air cooling Frequency Converter Control ring current is an alternating current 220V, takes from the frequency converter main power source, when the fast cutting apparatus of 6kV station service switches busbar voltage reduce amplitude and the time all less, do not influence frequency converter and normally move.As shown in Figure 1; When the station service low-voltage bus bar longer switching time, or can cause when starting large capacity motor busbar voltage significantly, long-time fluctuation, cause the local relay of frequency converter to close a floodgate; The self-holding circuit normal opened contact breaks off, and makes frequency converter out of service.Even busbar voltage is recovered subsequently, but the self-holding circuit normal opened contact breaks off, needs artificial hand behaviour to reset, and just can restart frequency converter.Manual reset, hand behaviour starts the time delays that causes will cause the turbine back pressure fluctuation, especially possibly cause unit tripping under the serious situation during high load capacity.
And traditional existing improvement thinking is to set up ups power for the Frequency Converter Control loop, to guarantee not cause the frequency converter tripping operation because of the control loop voltage fluctuation.This scheme fund input is high, and long construction period has also increased the line service amount.
The utility model content
Voltage fluctuation when solving that cogeneration power plant's air cooling frequency converter bus switches in the prior art causes long problem of air cooling frequency converter tripping operation manual reset time; The utility model is avoided the delay protection of DCS control module through increasing time-delay relay in the line; Realize automatically reseting of air cooling frequency converter; Reduced the time that resets and spent; Improved operating efficiency, concrete scheme is following: a kind of thermal power plant air cooling frequency converter is optimized circuit, comprises local relay, long-range relay and frequency converter relay; Be connected with the frequency converter relay after wherein local relay and the long-range relay parallel connection; Output at local relay and long-range relay is parallel with local relay switch and long-range relay switch, and frequency converter relay switch A, the frequency converter relay switch B of frequency converter relay connect with local relay switch and long-range relay switch respectively, it is characterized in that; Said frequency converter relay two ends are parallel with time-delay relay, and the time-delay relay switch is parallelly connected with frequency converter relay switch B.
For realizing Long-distance Control: the DCS control system is controlled long-range relay through the DCS relay; The DCS relay is connected between long-range relay switch and the frequency converter relay switch B, the DCS relay switch be connected DCS relay access point and frequency converter relay switch B and between.
For realizing the start and stop of long-range frequency converter: be connected with long-range shutdown switch and remote activation switch on the said DCS relay circuit; Its medium-long range shutdown switch is connected between DCS relay and DCS relay switch, and the remote activation switch is parallelly connected with frequency converter relay switch B.
The utility model to the air cooling frequency converter be optimized be provided with after; The low pressure station service switch or start large capacity motor cause busbar voltage significantly, when fluctuating for a long time; The air cooling frequency conversion fan can be realized self-starting; Reduce the disturbance that turbine back pressure is caused, reduced the hidden danger of unit safety operation, improved the economy and the stability of unit.
Description of drawings
The circuit of air cooling frequency converter connects sketch map in Fig. 1 prior art.
The air cooling converter circuit of Fig. 2 the utility model connects sketch map.
The local relay of label declaration in the accompanying drawing: 1-, the local relay switch of 101-, the long-range relay of 2-, the long-range relay switch of 201-, 3-frequency converter relay, 301-frequency converter relay switch A, 302-frequency converter relay switch B, 4-time-delay relay, 401-time-delay relay switch, 5-DCS relay, 501-DCS relay switch, 502-remote activation switch, the long-range shutdown switch of 503-.
Embodiment
As shown in Figure 2; Local relay 1 is connected with frequency converter relay 3 with long-range relay 2 parallel connection backs; Output at local relay 1 and long-range relay 2 is parallel with local relay switch 101 and long-range relay switch 201; The frequency converter relay switch A301 of frequency converter relay 3, frequency converter relay switch B302 connect with local relay switch 101 and long-range relay switch 201 respectively; Frequency converter relay 3 two ends are parallel with time-delay relay 4, and time-delay relay switch 401 is parallelly connected with frequency converter relay switch B302.Long-range DCS control system is through the long-range relay 2 of DCS relay 5 controls; DCS relay 5 is connected between long-range relay switch 201 and the frequency converter relay switch B302, DCS relay switch 501 be connected DCS relay access point and frequency converter relay switch B302 and between.The DCS control system is through being arranged on the long-range shutdown switch 503 and the long-range start and stop of remote activation switch 502 realizations to frequency converter on the DCS relay circuit; Its medium-long range shutdown switch 503 is connected between DCS relay 5 and DCS relay switch 501, and remote activation switch 502 is parallelly connected with frequency converter relay switch B302.
In the prior art; After the voltage fluctuation of frequency converter chance was closed, frequency converter relay switch B was in open mode, after voltage recovers; Long-range relay switch is closed; But frequency converter switch B still is in open mode, so the DCS control system can not pass through remote activation switch deactivation frequency converter relay, needs artificial SB1 and the SB2 deactivation frequency converter relay on the local relay circuit that go to press this moment; The frequency converter relay starts back frequency converter relay switch B just can be closed, the start and stop that the DCS control system can the control of conversion device.
And after the utility model increased time-delay relay; After making that frequency converter stops; Time-delay relay can send the signal of 3 seconds closed frequency converter relay switch B of a time-delay through the time-delay relay switch; Make the frequency converter relay switch at this moment between in be in closure state, when the DCS control system was sent remote activation frequency converter signal, signal can start frequency converter through the frequency converter relay switch smoothly.
For guaranteeing that the DCS control system can Long-distance Control frequency converter orderly closedown; The halt instruction pulsewidth time-delay (8S) of DCS control system need be greater than the time-delay (3S) of time-delay relay; Can escape the delay time of newly-increased power-off delay relay like this, guarantee that with this DCS normally stops frequency converter.
The above only is the preferred embodiment of the utility model; Be not that the utility model is done any pro forma restriction; Though the utility model discloses as above with preferred embodiment; Yet be not in order to limit the utility model; Any technical staff who is familiar with this patent makes a little change or is modified to the equivalent embodiment of equivalent variations when the technology contents of above-mentioned prompting capable of using in not breaking away from the utility model technical scheme scope, is the content that does not break away from the utility model technical scheme in every case;, all still belong in the scope of the utility model scheme any simple modification, equivalent variations and modification that above embodiment did according to the technical spirit of the utility model.
Claims (3)
1. thermal power plant's air cooling frequency converter is optimized circuit; Comprise local relay (1), long-range relay (2) and frequency converter relay (3); Wherein local relay (1) is connected with frequency converter relay (3) with long-range relay (2) parallel connection back; Output at local relay (1) and long-range relay (2) is parallel with local relay switch (101) and long-range relay switch (201); The frequency converter relay switch A (301) of frequency converter relay (3), frequency converter relay switch B (302) connect with local relay switch (101) and long-range relay switch (201) respectively; It is characterized in that said frequency converter relay (3) two ends are parallel with time-delay relay (4), time-delay relay switch (401) is parallelly connected with long-range relay switch B.
2. a kind of thermal power plant as claimed in claim 1 air cooling frequency converter is optimized circuit; It is characterized in that; The DCS control system is controlled long-range relay (3) through DCS relay (5); DCS relay (5) is connected between long-range relay switch (201) and the frequency converter relay switch B (302), DCS relay switch (501) be connected DCS relay access point and frequency converter relay switch B (302) and between.
3. a kind of thermal power plant as claimed in claim 1 air cooling frequency converter is optimized circuit; It is characterized in that; Be connected with long-range shutdown switch (503) and remote activation switch (502) on the DCS relay circuit; Its medium-long range shutdown switch (503) is connected between DCS relay (5) and DCS relay switch (501), and remote activation switch (502) is parallelly connected with frequency converter relay switch B (302).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012203289700U CN202634265U (en) | 2012-07-09 | 2012-07-09 | Optimized circuit of air-cooling frequency converter for thermal power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012203289700U CN202634265U (en) | 2012-07-09 | 2012-07-09 | Optimized circuit of air-cooling frequency converter for thermal power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202634265U true CN202634265U (en) | 2012-12-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012203289700U Expired - Lifetime CN202634265U (en) | 2012-07-09 | 2012-07-09 | Optimized circuit of air-cooling frequency converter for thermal power plant |
Country Status (1)
| Country | Link |
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| CN (1) | CN202634265U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106997190A (en) * | 2016-01-25 | 2017-08-01 | 费希尔控制产品国际有限公司 | The intelligence for being connected to local control panel or the digital positioners of button automatically resets |
| CN109737296A (en) * | 2018-12-18 | 2019-05-10 | 中国神华能源股份有限公司 | Oil pump control method and device, system, storage medium, electronic device |
-
2012
- 2012-07-09 CN CN2012203289700U patent/CN202634265U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106997190A (en) * | 2016-01-25 | 2017-08-01 | 费希尔控制产品国际有限公司 | The intelligence for being connected to local control panel or the digital positioners of button automatically resets |
| CN109737296A (en) * | 2018-12-18 | 2019-05-10 | 中国神华能源股份有限公司 | Oil pump control method and device, system, storage medium, electronic device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121226 |