CN110887644A - Load switch gear state detection method and system - Google Patents
Load switch gear state detection method and system Download PDFInfo
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- CN110887644A CN110887644A CN201911030642.5A CN201911030642A CN110887644A CN 110887644 A CN110887644 A CN 110887644A CN 201911030642 A CN201911030642 A CN 201911030642A CN 110887644 A CN110887644 A CN 110887644A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/021—Gearings
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Abstract
The application provides a load switch gear state detection method and system, which comprises the following steps: firstly, acquiring the maximum value of current flowing through a driving motor when the load switch acts; then acquiring the maximum value of the rotating speed of the gear box when the load switch acts; secondly, calculating a ratio of the maximum rotating speed value to the maximum current value to obtain a characteristic parameter; and finally, determining whether a fault exists in the gear in the gearbox during operation or not based on the characteristic parameter and a preset characteristic parameter threshold value. The gear box internal gear detection method can be used for rapidly and accurately determining whether a fault exists in the gear box internal gear during operation, and has the advantages of being portable in field implementation and high in detection efficiency.
Description
Technical Field
The application relates to the technical field of load switches, in particular to a load switch gear state detection method and system.
Background
The load switch is a switching device between the breaker and the isolating switch, and can cut off rated load current and certain overload current. At present, load switches are used in the field of low-voltage power distribution in a large number, and when the load switches break down, a power distribution system can break down, so that the power supply requirement is influenced. The working process of the load switch is that the power supply supplies power to the driving motor, the driving motor drives the gear to compress the spring energy storage mechanism, and the spring drives the contact to act, so that the switch is switched on and off. The whole working process is a complex mechanical movement process, and equipment failure can be caused when any link goes wrong.
At present, no detection method can accurately detect the mechanical state of the load switch. Therefore, detecting the mechanical state of the load switch is an urgent problem to be solved.
Disclosure of Invention
Therefore, it is necessary to provide a method and a system for detecting the gear state of a load switch, aiming at the problem that no existing detection method can accurately detect the mechanical state of the load switch.
A load switch gear state detection method comprises the following steps:
acquiring the maximum value of current flowing through a driving motor when the load switch acts;
acquiring the maximum rotating speed value of the gear box when the load switch acts;
calculating a ratio of the maximum rotating speed value to the maximum current value to obtain a characteristic parameter;
and determining whether a fault exists in the gear in the gearbox when the gear operates based on the characteristic parameter and a preset characteristic parameter threshold value.
In one embodiment, the step of determining whether a fault exists in the gear in the gearbox when the gear operates based on the characteristic parameter and a preset characteristic parameter threshold value comprises the following steps:
acquiring a preset characteristic parameter threshold value, and comparing the characteristic parameter with the preset characteristic parameter threshold value to obtain a comparison result;
and whether the gear in the gearbox has a fault during operation or not based on the comparison result.
In one embodiment, the step of determining whether the gear in the gearbox is faulty during operation based on the comparison comprises:
if the comparison result is that the characteristic parameter is smaller than the preset characteristic parameter threshold value, determining that the gearbox has a fault;
and if the comparison result shows that the characteristic parameter is greater than or equal to the preset characteristic parameter threshold value, determining that the gearbox normally operates.
In one embodiment, before the step of obtaining the maximum value of the current flowing through the driving motor when the load switch is actuated, the method further comprises:
acquiring the maximum value of the initial current flowing through the driving motor when the load switch is operated for the first time after leaving a factory;
acquiring the maximum value of the initial rotating speed of the gearbox when the load switch is operated for the first time after leaving a factory;
obtaining a ratio of the maximum value of the initial current and the maximum value of the initial rotating speed to obtain an initial characteristic parameter;
and determining the preset characteristic parameter threshold value based on the initial characteristic parameter.
In one embodiment, the preset characteristic threshold is 0.8 times the initial characteristic.
In one embodiment, the step of obtaining the maximum value of the current flowing through the driving motor when the load switch is actuated comprises the following steps:
and acquiring the maximum value of the current flowing through the driving motor when the load switch acts through a current sensor.
In one embodiment, the step of obtaining the maximum value of the rotation speed of the gearbox when the load switch is actuated comprises the following steps:
and acquiring the maximum rotating speed value of the gear box when the load switch acts through a magnetoelectric rotating speed sensor.
A load switch gear state detection system is applied to a load switch and comprises:
the current sensor is arranged on the driving motor and used for detecting the maximum value of the current flowing through the driving motor;
the rotating speed sensor is arranged on the gearbox and used for detecting the maximum rotating speed value of the gearbox;
and the controller is respectively electrically connected with the current sensor and the rotating speed sensor and is used for acquiring the rotating speed maximum value and the current maximum value, solving the ratio of the rotating speed maximum value and the current maximum value to obtain a characteristic parameter, and determining whether a fault exists in the gear box during operation based on the characteristic parameter and a preset characteristic parameter threshold value.
In one embodiment, the controller is configured to compare the characteristic parameter with a preset characteristic parameter threshold, determine that the gear box has a fault if the characteristic parameter is smaller than the preset characteristic parameter threshold, and determine that the gear box is normal if the characteristic parameter is greater than or equal to the preset characteristic parameter threshold.
In one embodiment, the predetermined characteristic threshold is 0.8 times the initial characteristic.
Compared with the prior art, the load switch gear state detection method and the load switch gear state detection system firstly obtain the maximum value of the current flowing through the driving motor when the load switch acts; then acquiring the maximum value of the rotating speed of the gear box when the load switch acts; secondly, calculating a ratio of the maximum rotating speed value to the maximum current value to obtain a characteristic parameter; and finally, determining whether a fault exists in the gear in the gearbox during operation or not based on the characteristic parameter and a preset characteristic parameter threshold value. By adopting the detection method, whether the fault exists in the gear box during operation can be quickly and accurately determined, and the detection method has the advantages of being portable in field implementation and high in detection efficiency.
Drawings
Fig. 1 is a flowchart of a method for detecting a gear state of a load switch according to an embodiment of the present disclosure;
fig. 2 is a block diagram of a load switch according to an embodiment of the present disclosure;
fig. 3 is a block diagram of a load switch gear state detection system according to an embodiment of the present disclosure.
10 load switch
101 power supply
110 driving motor
120 gear box
130 energy storage spring
140 contact
20 load switch gear state detection system
210 current sensor
220 rotating speed sensor
230 controller
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present application provides a gear state detection method for a load switch, which can be applied to the load switch 10 to detect a gear state in the load switch 10. The method comprises the following steps:
s102: the maximum value of the current flowing through the driving motor 110 when the load switch 10 is operated is obtained.
It is to be understood that the manner of obtaining the maximum value of the current flowing through the driving motor 110 when the load switch 10 is operated is not limited as long as the maximum value of the current can be obtained. In one embodiment, the maximum value of the current flowing through the driving motor 110 when the load switch 10 is operated may be measured by a current sensor 210. Specifically, the current sensor 210 may be disposed on the driving motor 110, so that the maximum value of the current flowing from the power source 101 to the driving motor 110 (as shown in fig. 2) can be detected by the hall current sensor. In one embodiment, the current sensor 210 may be a hall current sensor. In one embodiment, the maximum value of the current flowing through the driving motor 110 when the load switch 10 is operated can be obtained by a processor or a single chip microcomputer based on the current sensor 210.
S104: the maximum value of the rotation speed of the gear box 120 when the load switch 10 is operated is obtained.
It is understood that the maximum value of the rotation speed of the gearbox 120 is obtained in any way, as long as the maximum value of the rotation speed of the gearbox 120 can be obtained. In one embodiment, the maximum value of the rotational speed of the gearbox 120 may be obtained by a rotational speed sensor 220. Specifically, the rotation speed sensor 220 may be disposed on the gearbox 120, so that the maximum rotation speed of the gearbox 120 is detected and obtained by the rotation speed sensor 220. In one implementation, the tachometer sensor 220 may be a magneto-electric tachometer sensor. Through magnetoelectric tachometric transducer can realize carrying out non-contact rotational speed to gear 120 internal gear measures, has to measure portable advantage. In one embodiment, the maximum value of the rotation speed of the gearbox 120 may be obtained by the processor or the single chip microcomputer based on the rotation speed sensor 220.
S106: and solving the ratio of the maximum rotating speed value to the maximum current value to obtain a characteristic parameter.
In one embodiment, the maximum value of the rotation speed and the maximum value of the current can be ratioed by the processor or the single chip microcomputer. Namely, the maximum value of the rotational speed (N) is divided by the maximum value of the current (I) to obtain a quotient (i.e., the characteristic variable P). That is, the characteristic parameter may be calculated by the processor or the single chip microcomputer in real time during the subsequent operation of the load switch 10 (i.e., except when the load switch 10 is put into operation for the first time).
S108: and determining whether the gear in the gearbox 120 has a fault during operation based on the characteristic parameter and a preset characteristic parameter threshold value.
In one embodiment, the initial characteristic parameter may be obtained by performing steps S102 to S106 when the load switch 10 is first put into operation. That is, the maximum value (I) of the initial current flowing through the driving motor 110 when the load switch 10 is operated for the first time after leaving the factory (i.e., when the load switch is put into operation for the first time) can be obtained by the processor or the single chip microcomputer0). The maximum initial rotation speed (N) of the gearbox 120 when the load switch 10 is first operated after leaving factory can be obtained by the processor or the single chip microcomputer0). Then the initial current maximum value and the initial rotating speed maximum value can be subjected to ratio calculation by the processor or the singlechip to obtain an initial characteristic parameter (P)0) I.e. P0＝N0/I0. The predetermined characteristic threshold value is thus determined on the basis of the initial characteristic. In one embodiment, the preset characteristic threshold may be set to 0.8 times the initial characteristic.
In one embodiment, whether a fault exists in the gear in the gearbox when the gear operates can be determined through the processor or the single chip microcomputer based on the characteristic parameter and a preset characteristic parameter threshold value. Specifically, the processor or the single chip microcomputer may obtain the preset characteristic parameter threshold value first. That is, the preset characteristic parameter threshold may be stored in the processor or the single chip in advance, or the preset characteristic parameter threshold may be stored in the memory in advance. When the processor or the single chip microcomputer needs to use the preset characteristic parameter threshold value, the preset characteristic parameter threshold value can be directly called from a self storage space or the memory.
In one embodiment, after the processor or the single chip microcomputer obtains the preset characteristic parameter threshold, the characteristic parameter is compared with the preset characteristic parameter threshold, and a comparison result is obtained. If the comparison result is that the characteristic parameter is smaller than the preset characteristic parameter threshold (i.e., at this time, the rotation speed of the gear box 120 is reduced, the output current of the driving motor 110 is increased, and the characteristic parameter is reduced), it may be determined that the gear box 120 has a fault. It is possible to determine that there is a failure such as abrasion, foreign matter, etc. in the gears in the gear box 120. At this point, the power needs to be cut off and the gearbox 120 needs to be further inspected and repaired to avoid further propagation of the fault and damage to the gearbox 120.
In one embodiment, if the comparison result is that the characteristic parameter is greater than or equal to the preset characteristic parameter threshold value, it is determined that the gearbox 120 is operating normally. I.e. the current operating state of the gearbox 120 is maintained at this point.
Referring to fig. 2, in operation of the load switch 10 of the present embodiment, the power source 101 may supply power to the driving motor 110, and then the driving motor 110 drives the gear box 120 to compress the energy storage spring 130, so that the energy storage spring 130 drives the contact 140 to act to open and close the load switch 10. When the load switch 10 is in operation, the maximum value of the current flowing through the driving motor 110 when the load switch 10 is in operation can be measured by the current sensor 210. Meanwhile, the maximum value of the rotation speed of the gearbox 120 can be detected and obtained by the rotation speed sensor 220. So that the processor or the single chip microcomputer determines whether a fault exists in the operation of the gear in the gearbox 120 based on the maximum rotating speed value, the maximum current value and the preset characteristic parameter threshold value.
In this embodiment, the maximum value of the current flowing through the driving motor 110 when the load switch 10 is in operation is obtained first; then, the maximum value of the rotating speed of the gearbox 120 when the load switch 10 acts is obtained; secondly, calculating a ratio of the maximum rotating speed value to the maximum current value to obtain a characteristic parameter; and finally, determining whether a fault exists in the gear box 120 during operation based on the characteristic parameter and a preset characteristic parameter threshold value. By adopting the detection method, whether the internal gear of the gearbox 120 has a fault during operation can be quickly and accurately determined, and the method has the advantages of being portable in field implementation and high in detection efficiency.
Referring to fig. 3, an embodiment of the present application provides a gear state detection system 20 for a load switch 10. The load switch gear state detection system 20 includes: a current sensor 210, a rotational speed sensor 220, and a controller 230. The current sensor 210 is disposed at the driving motor 110. The current sensor 210 is used to detect the maximum value of the current flowing through the driving motor 110. The rotation speed sensor 220 is disposed on the gear box 120. The rotational speed sensor 220 is used for detecting the maximum rotational speed of the gearbox 120. The controller 230 is electrically connected to the current sensor 210 and the rotational speed sensor 220, respectively. The controller 230 is configured to obtain the maximum rotation speed value and the maximum current value, obtain a ratio of the maximum rotation speed value and the maximum current value, obtain a characteristic parameter, and determine whether a fault exists in operation of a gear in the gearbox 120 based on the characteristic parameter and a preset characteristic parameter threshold.
In one embodiment, the current sensor 210 may be a hall current sensor. The hall current sensor detects a maximum value of the current flowing from the power source 101 to the driving motor 110, and transmits the detected result to the controller 230. In one embodiment, the power source 101 may be a dc power source, such as a battery or the like. In one embodiment, the power source 101 may be an ac power source, such as mains power.
In one embodiment, the tachometer sensor 220 may be a magneto-electric tachometer sensor. The magnetoelectric rotation speed sensor can be used for carrying out non-contact measurement on the rotation speed of the gear in the gear box 120, and has the advantage of simple and convenient field operation. The magnetoelectric rotation speed sensor measures the maximum rotation speed and sends the detection result to the controller 230.
In one embodiment, after receiving the maximum rotation speed value and the maximum current value, the controller 230 may ratio the maximum rotation speed value and the maximum current value to obtain a characteristic parameter. It is then determined whether a fault is present in the annulus of the gearbox 120 during operation, based on the characteristic and a preset characteristic threshold. Specifically, if the characteristic parameter is greater than or equal to the preset characteristic parameter threshold value, it is determined that the gearbox is normal. And if the characteristic parameter is smaller than the preset characteristic parameter threshold value, determining that the gearbox has a fault.
That is, when there is a failure such as abrasion or entry of foreign matter in the gear box 120, the rotational speed of the gear in the gear box 120 is reduced, so that the output current of the drive motor 110 becomes large, and the characteristic parameter becomes small. That is, the controller 230 may determine whether there is a fault in the operation of the gear in the gearbox 120 according to the relationship between the characteristic and the preset characteristic threshold. In one embodiment, the preset characteristic threshold may be set to 0.8 times the initial characteristic.
The initial characteristic parameter may be obtained by measuring an initial maximum current value of the driving motor 110 and an initial maximum rotational speed value of the gearbox 120 when the load switch 10 is first put into operation, and determining the initial characteristic parameter according to the initial maximum current value and the initial maximum rotational speed value.
In summary, the present application first obtains the maximum value of the current flowing through the driving motor 110 when the load switch 10 is in operation; then, the maximum value of the rotating speed of the gearbox 120 when the load switch 10 acts is obtained; secondly, calculating a ratio of the maximum rotating speed value to the maximum current value to obtain a characteristic parameter; and finally, determining whether a fault exists in the gear box 120 during operation based on the characteristic parameter and a preset characteristic parameter threshold value. The detection method can be used for rapidly and accurately determining whether a fault exists in the gear box 120 during operation, and has the advantages of being portable in field implementation and high in detection efficiency.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A load switch gear state detection method is characterized by comprising the following steps:
acquiring the maximum value of current flowing through a driving motor when the load switch acts;
acquiring the maximum rotating speed value of the gear box when the load switch acts;
calculating a ratio of the maximum rotating speed value to the maximum current value to obtain a characteristic parameter;
and determining whether a fault exists in the gear in the gearbox when the gear operates based on the characteristic parameter and a preset characteristic parameter threshold value.
2. The load switch gear state detection method of claim 1, wherein the step of determining whether a fault exists in operation of a gear in the gearbox based on the characteristic and a preset characteristic threshold comprises:
acquiring a preset characteristic parameter threshold value, and comparing the characteristic parameter with the preset characteristic parameter threshold value to obtain a comparison result;
and whether the gear in the gearbox has a fault during operation or not based on the comparison result.
3. The load switch gear state detection method of claim 2, wherein the step of determining whether there is a fault in operation of the gear within the gearbox based on the comparison comprises:
if the comparison result is that the characteristic parameter is smaller than the preset characteristic parameter threshold value, determining that the gearbox has a fault;
and if the comparison result shows that the characteristic parameter is greater than or equal to the preset characteristic parameter threshold value, determining that the gearbox normally operates.
4. The load switch gear state detection method of claim 1, wherein prior to the step of obtaining a maximum value of current flowing through the drive motor when the load switch is in operation, the method further comprises:
acquiring the maximum value of the initial current flowing through the driving motor when the load switch is operated for the first time after leaving a factory;
acquiring the maximum value of the initial rotating speed of the gearbox when the load switch is operated for the first time after leaving a factory;
obtaining a ratio of the maximum value of the initial current and the maximum value of the initial rotating speed to obtain an initial characteristic parameter;
and determining the preset characteristic parameter threshold value based on the initial characteristic parameter.
5. The method of claim 4, wherein the predetermined characteristic threshold is 0.8 times the initial characteristic.
6. The load switch gear state detection method according to claim 1, wherein the step of acquiring a maximum value of a current flowing through a drive motor when the load switch is operated comprises:
and acquiring the maximum value of the current flowing through the driving motor when the load switch acts through a current sensor.
7. The load switch gear state detection method of claim 1, wherein the step of obtaining a maximum value of a rotational speed of the gearbox when the load switch is actuated comprises:
and acquiring the maximum rotating speed value of the gear box when the load switch acts through a magnetoelectric rotating speed sensor.
8. A load switch gear state detection system, applied to a load switch (10), comprising:
the current sensor (210) is arranged on the driving motor (110) and used for detecting the maximum value of the current flowing through the driving motor (110);
the rotating speed sensor (220) is arranged on the gearbox (120) and used for detecting the maximum rotating speed value of the gearbox (120);
and the controller (230) is respectively electrically connected with the current sensor (210) and the rotating speed sensor (220) and is used for acquiring the rotating speed maximum value and the current maximum value, solving the ratio of the rotating speed maximum value and the current maximum value to obtain a characteristic parameter, and determining whether a fault exists in the gear box (120) during operation based on the characteristic parameter and a preset characteristic parameter threshold value.
9. The load switch gear state detection system of claim 8, wherein the controller (230) is configured to compare the characteristic to the predetermined characteristic threshold, determine that the gearbox is malfunctioning if the characteristic is less than the predetermined characteristic threshold, and determine that the gearbox is normal if the characteristic is greater than or equal to the predetermined characteristic threshold.
10. The load switch gear state detection system of claim 9, wherein the predetermined characteristic threshold is 0.8 times the initial characteristic.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911030642.5A CN110887644A (en) | 2019-10-28 | 2019-10-28 | Load switch gear state detection method and system |
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| CN201911030642.5A CN110887644A (en) | 2019-10-28 | 2019-10-28 | Load switch gear state detection method and system |
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| CN113300323A (en) * | 2021-06-28 | 2021-08-24 | 贵州长通电气有限公司 | Load switch electric control system |
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