CN113110686A - Automatic transfer switch conversion frequency limiting method and device and automatic transfer switch - Google Patents
Automatic transfer switch conversion frequency limiting method and device and automatic transfer switch Download PDFInfo
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- CN113110686A CN113110686A CN202110467096.2A CN202110467096A CN113110686A CN 113110686 A CN113110686 A CN 113110686A CN 202110467096 A CN202110467096 A CN 202110467096A CN 113110686 A CN113110686 A CN 113110686A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/625—Regulating voltage or current wherein it is irrelevant whether the variable actually regulated is ac or dc
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Abstract
The invention discloses a method for limiting the conversion frequency of an automatic transfer switch, which is used for limiting the conversion action times of the automatic transfer switch in unit time not to exceed a preset maximum conversion action time N; presetting Z timing units with timing duration as the unit time and capable of automatically switching to a non-timing state after timing is finished, wherein Z is more than or equal to N; in the process of controlling the automatic change-over switch, before the change-over action is executed, comparing the number A of the timing units in the timing state with N, and if A is more than or equal to N, forbidding to execute the change-over action; if A is less than N, executing the conversion action and starting a timing unit in a non-timing state to start timing. The invention also discloses a device for limiting the conversion frequency of the automatic change-over switch and the automatic change-over switch. Compared with the prior art, the method and the device have the advantages that the limitation on the conversion action times of the automatic change-over switch in unit time is realized in a simpler and quicker mode, and the instantaneity is better.
Description
Technical Field
The invention relates to an automatic change-over switch, in particular to a method for limiting the change-over frequency of the automatic change-over switch.
Background
The automatic change-over switch is usually driven by a motor or an electromagnet to execute a change-over action, and in a power utilization occasion with large power grid voltage fluctuation, the automatic change-over switch has the possibility of frequent switching, and the frequent switching back and forth can enable the motor or a coil of the electromagnet to be in a powered-on state frequently.
The usual methods of preventing frequent switching of the switches are: the automatic switching frequency of the switch is compared with the number of switching times per unit time set before switching operation. If the automatic switching frequency exceeds the set switching frequency in unit time, the controller sends out an alarm prompt, and the switching action is not executed; if the automatic switching frequency does not exceed the set switching times in the unit time, the controller sends out a switching action signal. The switching operation frequency is calculated according to the time interval between the first time and the last time of the switching times in unit time, and is compared with the set switching times in unit time to obtain whether the switch is frequently switched or not.
The method has the biggest defect that the time interval of the first conversion action and the time interval of the last conversion action are calculated before each conversion action, the time interval is converted into the conversion action frequency by combining the conversion action times, and whether the conversion action is allowed to be executed can be judged after the calculation is finished, namely, more calculation steps are required before each conversion action is executed, and the codes are more complex.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a limiting method for the conversion frequency of an automatic change-over switch, which realizes the limitation of the conversion action times of the automatic change-over switch in unit time in a simpler and quicker way and has better real-time property.
A method for limiting the conversion frequency of an automatic transfer switch is used for limiting the conversion action times of the automatic transfer switch in unit time not to exceed a preset maximum conversion action time N; presetting Z timing units with timing duration as the unit time and capable of automatically switching to a non-timing state after timing is finished, wherein Z is more than or equal to N; in the process of controlling the automatic change-over switch, before the change-over action is executed, comparing the number A of the timing units in the timing state with N, and if A is more than or equal to N, forbidding to execute the change-over action; if A is less than N, executing the conversion action and starting a timing unit in a non-timing state to start timing.
Preferably, Z = N.
Furthermore, alarm prompt is carried out while the execution of the conversion action is forbidden.
Preferably, the timing unit is a software-implemented counter or timer.
Further preferably, the timing unit uses a timing variable to count up the unit time duration by a preset number of times within the timer interrupt.
According to the same inventive concept, the following technical scheme can be obtained:
a kind of automatic change-over switch conversion frequency limit device, is used for limiting the number of times of conversion movements of the automatic change-over switch in the unit interval not to exceed the number of times of conversion movements of the predetermined maximum N; the device includes:
the preset Z timing units are provided, the timing duration of each timing unit is the unit time and can be automatically switched to a non-timing state after timing is finished, and Z is more than or equal to N;
the conversion limiting module is used for comparing the number A of the timing units in the timing state with the number N before executing the conversion action in the process of controlling the automatic conversion switch, and forbidding executing the conversion action if A is more than or equal to N; if A is less than N, executing the conversion action and starting a timing unit in a non-timing state to start timing.
Preferably, Z = N.
Furthermore, alarm prompt is carried out while the execution of the conversion action is forbidden.
Preferably, the timing unit is a software-implemented counter or timer.
Further preferably, the timing unit uses a timing variable to count up the unit time duration by a preset number of times within the timer interrupt.
An automatic change-over switch is provided with the switching frequency limiting device of the automatic change-over switch.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the invention simply and conveniently realizes the prevention of frequent switching actions of the automatic change-over switch, not only improves the service life of the coil, but also can effectively prevent the coil from being burnt by overheating.
Drawings
FIG. 1 is a flow chart of the transfer frequency definition of an automatic transfer switch according to an embodiment of the present invention;
fig. 2 is a schematic diagram of the switching frequency limit of the automatic transfer switch according to an embodiment of the present invention.
Fig. 3 is a schematic diagram illustrating the limitation of the switching frequency of the automatic transfer switch according to an embodiment of the present invention.
Detailed Description
Aiming at the problems of more calculation steps and more complex codes in the prior art for realizing conversion frequency limitation, the invention aims to improve and optimize a specific algorithm and realize simple and rapid identification on whether frequent conversion phenomena exist in an automatic transfer switch or not by utilizing the automatic timing function of a series of timing units, thereby avoiding complicated conversion action frequency calculation.
Specifically, the technical scheme provided by the invention is as follows:
a method for limiting the conversion frequency of an automatic transfer switch is used for limiting the conversion action times of the automatic transfer switch in unit time not to exceed a preset maximum conversion action time N; presetting Z timing units with timing duration as the unit time and capable of automatically switching to a non-timing state after timing is finished, wherein Z is more than or equal to N; in the process of controlling the automatic change-over switch, before the change-over action is executed, comparing the number A of the timing units in the timing state with N, and if A is more than or equal to N, forbidding to execute the change-over action; if A is less than N, executing the conversion action and starting a timing unit in a non-timing state to start timing.
A kind of automatic change-over switch conversion frequency limit device, is used for limiting the number of times of conversion movements of the automatic change-over switch in the unit interval not to exceed the number of times of conversion movements of the predetermined maximum N; the device includes:
the preset Z timing units are provided, the timing duration of each timing unit is the unit time and can be automatically switched to a non-timing state after timing is finished, and Z is more than or equal to N;
the conversion limiting module is used for comparing the number A of the timing units in the timing state with the number N before executing the conversion action in the process of controlling the automatic conversion switch, and forbidding executing the conversion action if A is more than or equal to N; if A is less than N, executing the conversion action and starting a timing unit in a non-timing state to start timing.
The timing unit can be implemented by software or hardware, and preferably by software, such as a counter or a timer implemented by software; the number Z of the timing units may be equal to or greater than the maximum number N of switching actions, and from practical considerations, only Z = N is required, thereby reducing the use of timing units.
When detecting that A is more than or equal to N, the conversion action of the automatic conversion switch is over frequent, and when the conversion action is forbidden to be executed, alarm prompt can be carried out through various modes such as sound, light or screen display, short message sending and the like.
For the public understanding, the technical scheme of the invention is further explained in detail by a specific embodiment and the accompanying drawings:
in the automatic change-over switch in the embodiment, the change-over driving part is the electromagnet, and considering that the long-term frequent electrification of the electromagnet coil can affect the service life, the change-over action times per minute of the automatic change-over switch is limited not to exceed 2, namely 2 change-over actions are allowed to occur per minute, and the 3 rd change-over action is forbidden and an alarm prompt is given.
Presetting a total of 2 timing units a and b; each timing unit can realize the 1 minute timing in unit time by adopting independent timing variables which are continuously increased from 0 to 6000 within the 10ms timing interruption.
The timing unit has two states: the state of the timing unit being in the unit time timing is called as "timing" state; the state of the clocked unit not in the unit time clocking is referred to as a "non-clocked" state.
The timing unit in the 'timing' state stops timing and automatically changes to the timing unit in the 'non-timing' state after the timing unit achieves 1 minute. As shown in fig. 2.
The current common side power supply is normal, the standby side power supply is normal, and the load is powered by the common side power supply. If the power supply at the common side is abnormally changed, the automatic transfer switch controller detects that the power supply at the common side is abnormal through a certain time delay, if frequent transfer alarm does not exist, the automatic transfer switch controller is subjected to transfer action time delay to prepare to send a standby closing instruction, a load is to be switched to be supplied with power by the power supply at the standby side, and at the moment, transfer frequency limitation is carried out according to the flow shown in fig. 1; the specific implementation process is described as follows in different cases:
before sending a standby closing instruction, the states of 2 timing units are respectively detected, specifically as follows:
s0, timing units a and b are all in 'non-timing' state
It is explained that 0 switching operation occurred in the last 1 minute, and this switching operation is allowed to switch to the 1 st switching operation. And immediately sending a standby closing instruction, starting a timing unit a in a non-timing state to start timing for 1 minute, and automatically switching the timing unit a to a timing state. As shown by the dashed boxes (i) to (ii) path in fig. 3.
S1a, timing unit a is in 'timing' state, b is in 'non-timing' state
It is explained that 1 switching operation occurs in the last 1 minute, and the current switching operation is switched to the 2 nd switching operation in the last 1 minute, and the current switching operation is allowed. And immediately sending a standby closing instruction, starting a timing unit b in a non-timing state to start timing for 1 minute and converting to a timing state. As shown by the paths from dashed boxes (c) to (c) in fig. 3.
S1b, timing unit b is in 'timing' state, a is in 'non-timing' state
It is explained that 1 switching operation occurs in the last 1 minute, and the current switching operation is switched to the 2 nd switching operation in the last 1 minute, and the current switching operation is allowed. And then, a standby closing instruction is sent out, and meanwhile, the timing unit a in the 'non-timing' state is started to start timing for 1 minute and is converted into the 'timing' state. As shown by the paths from the dotted line box (c) to (d) in fig. 3.
S2, timing units a and b are all in "timing" state
The 2-time conversion action occurs in the last 1 minute, the conversion is performed for the 3 rd time in the last 1 minute, the conversion action is forbidden because the upper limit of the 2-time conversion action allowed to occur per minute is reached currently, and a frequent conversion alarm prompt is sent. When the time of any timing unit a or b reaches 1 minute, the timing unit can automatically switch to a non-timing state and cancel the frequent switching alarm prompt.
If the timing unit a counts for 1 minute, the switching operation is allowed again after the timing unit a is switched to the "non-timing" state. As shown by the paths from dashed boxes (a) - (c) in fig. 3.
If the timing unit b counts time for 1 minute, the switching operation is allowed again after the timing unit b is switched to the 'non-timing' state. As shown by the paths of dashed boxes (r) to (c) in fig. 3.
If the timing units a and b count for 1 minute, the switching operation can be allowed again after the timing units a and b are switched to the non-timing state. As indicated by the paths from dashed boxes (r) to (r) in fig. 3.
Claims (11)
1. A method for limiting the conversion frequency of an automatic transfer switch is used for limiting the conversion action times of the automatic transfer switch in unit time not to exceed a preset maximum conversion action time N; the method is characterized in that Z timing units are preset, wherein the timing duration is the unit time and can be automatically switched to a non-timing state after timing is finished, and Z is more than or equal to N; in the process of controlling the automatic change-over switch, before the change-over action is executed, comparing the number A of the timing units in the timing state with N, and if A is more than or equal to N, forbidding to execute the change-over action; if A is less than N, executing the conversion action and starting a timing unit in a non-timing state to start timing.
2. The automatic transfer switch switching frequency defining method of claim 1, wherein Z = N.
3. The automatic transfer switch switching frequency limiting method as claimed in claim 1, wherein an alarm is provided while prohibiting execution of the present switching operation.
4. The automatic transfer switch switching frequency limiting method of claim 1, wherein the timing unit is a software-implemented counter or timer.
5. The automatic transfer switch switching frequency limiting method of claim 4, wherein the timing unit uses a timing variable to count the duration of the unit time by a predetermined number of times within a timer interrupt.
6. A kind of automatic change-over switch conversion frequency limit device, is used for limiting the number of times of conversion movements of the automatic change-over switch in the unit interval not to exceed the number of times of conversion movements of the predetermined maximum N; characterized in that the device comprises:
the preset Z timing units are provided, the timing duration of each timing unit is the unit time and can be automatically switched to a non-timing state after timing is finished, and Z is more than or equal to N;
the conversion limiting module is used for comparing the number A of the timing units in the timing state with the number N before executing the conversion action in the process of controlling the automatic conversion switch, and forbidding executing the conversion action if A is more than or equal to N; if A is less than N, executing the conversion action and starting a timing unit in a non-timing state to start timing.
7. The automatic transfer switch switching frequency limiting device of claim 6, wherein Z = N.
8. The automatic transfer switch switching frequency limiting device according to claim 6, wherein an alarm is provided while prohibiting execution of the present switching operation.
9. The automatic transfer switch switching frequency limiting device of claim 6, wherein the timing unit is a software-implemented counter or timer.
10. The automatic transfer switch switching frequency limiting device of claim 9, wherein the timing unit uses a timing variable to count the duration of the unit of time by a predetermined number of times within a timed interrupt.
11. An automatic transfer switch having a transfer frequency limiting device as claimed in any one of claims 6 to 10.
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| CN202110467096.2A CN113110686B (en) | 2021-04-28 | 2021-04-28 | Automatic transfer switch conversion frequency limiting method and device and automatic transfer switch |
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| CN202110467096.2A CN113110686B (en) | 2021-04-28 | 2021-04-28 | Automatic transfer switch conversion frequency limiting method and device and automatic transfer switch |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09163631A (en) * | 1995-11-29 | 1997-06-20 | Toyo Electric Mfg Co Ltd | Method of changing over feeding load by uniterruptible power supply unit |
| CN105072055A (en) * | 2015-09-17 | 2015-11-18 | 北京博维亚讯技术有限公司 | Ethernet switch and port polling system and polling method thereof |
| KR101692964B1 (en) * | 2016-07-11 | 2017-01-05 | 주식회사 넷츠 | Provisioning apparatus and method |
| CN106787145A (en) * | 2016-12-30 | 2017-05-31 | 施耐德万高（天津）电气设备有限公司 | The electromagnet coil power guard method of excitation-type double power supply automatic transfer switch |
| CN109240595A (en) * | 2018-08-24 | 2019-01-18 | 武汉中旗生物医疗电子有限公司 | Single-chip microcontroller frequency collection method and device |
-
2021
- 2021-04-28 CN CN202110467096.2A patent/CN113110686B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09163631A (en) * | 1995-11-29 | 1997-06-20 | Toyo Electric Mfg Co Ltd | Method of changing over feeding load by uniterruptible power supply unit |
| CN105072055A (en) * | 2015-09-17 | 2015-11-18 | 北京博维亚讯技术有限公司 | Ethernet switch and port polling system and polling method thereof |
| KR101692964B1 (en) * | 2016-07-11 | 2017-01-05 | 주식회사 넷츠 | Provisioning apparatus and method |
| CN106787145A (en) * | 2016-12-30 | 2017-05-31 | 施耐德万高（天津）电气设备有限公司 | The electromagnet coil power guard method of excitation-type double power supply automatic transfer switch |
| CN109240595A (en) * | 2018-08-24 | 2019-01-18 | 武汉中旗生物医疗电子有限公司 | Single-chip microcontroller frequency collection method and device |
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