CN115333046A - Self-adjusting protection method for motor - Google Patents
Self-adjusting protection method for motor Download PDFInfo
- Publication number
- CN115333046A CN115333046A CN202111682767.3A CN202111682767A CN115333046A CN 115333046 A CN115333046 A CN 115333046A CN 202111682767 A CN202111682767 A CN 202111682767A CN 115333046 A CN115333046 A CN 115333046A
- Authority
- CN
- China
- Prior art keywords
- motor
- self
- adaptive
- protection
- current
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000002159 abnormal effect Effects 0.000 claims abstract description 9
- 230000003044 adaptive effect Effects 0.000 claims description 25
- 238000012790 confirmation Methods 0.000 claims description 6
- 238000012795 verification Methods 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 230000003203 everyday effect Effects 0.000 description 3
- 238000011897 real-time detection Methods 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 238000009776 industrial production Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
- H02H7/0854—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load responsive to rate of change of current, couple or speed, e.g. anti-kickback protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/10—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current additionally responsive to some other abnormal electrical conditions
Landscapes
- Control Of Electric Motors In General (AREA)
Abstract
The invention provides a self-adjusting protection method of a motor, which is used for detecting the state parameters of the motor in real time; setting the state parameters, and judging whether the state parameters are normal or not; outputting a motor driving signal after judging that the state parameter is normal, and enabling the motor to work normally; stopping the motor after judging the state parameter is abnormal; and circulating the steps. The invention has the beneficial effects that: the normal starting of the motor is ensured, and the motor is not protected by mistake; but also ensures that the abnormity of the motor in the starting and normal working state can be found. And the protection reliability and accuracy are improved.
Description
Technical Field
The invention belongs to the technical field of electric power and electrical equipment, and particularly relates to a self-adjusting protection method for a motor.
Background
An electric motor is an electrical device widely used in industrial production and everyday life, which converts electric energy into mechanical energy. With the development of economy and the improvement of automation degree, the motor plays more and more important role, and modern industrial production and industrial departments and even our everyday lives hardly leave various motors, which are already the most main motive power and driving device in the production activities and everyday lives of the modern times. It is particularly critical to protect it reliably and effectively.
The current is very large when the motor is started, the peak current when the motor is started is taken as abnormal current to be protected by the existing motor protection method, so that the motor is protected by mistake, the motor cannot continuously run, and the peak current is misjudged as the abnormal current when the motor is started, so that the motor is frequently started and is started too frequently, and the motor is damaged due to long-term overload.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and solve the problem that the peak current is taken as abnormal current for protection when the motor is started in the conventional motor protection method, so that the motor is mistakenly protected and cannot continuously run.
A self-adjusting protection method of a motor is characterized by comprising the following specific steps:
the method comprises the following steps: detecting the state parameters of the motor in real time;
step two: setting the state parameters, and judging whether the state parameters are normal or not;
step three: outputting a motor driving signal after judging that the state parameter is normal, and enabling the motor to work normally;
step four: stopping the motor after judging the state parameter is abnormal;
step five: and circulating the steps.
Preferably, the real-time detection of the state parameter of the motor in the first step includes the following steps:
step 1: acquiring state parameters of a motor in a preset time period and maximum state parameter values of a power distribution machine in the preset time period;
step 2: determining to obtain a self-adaptive protection setting value of the motor according to the maximum current value of the motor in the preset time period and the state parameter threshold of the motor;
and step 3: and determining whether the self-adaptive protection mode is started, if so, configuring the self-adaptive protection setting value of the motor to a local and/or remote self-adaptive protection system corresponding to the motor, and correcting the self-adaptive protection setting value of the motor on line in real time.
Preferably, the motor state parameter comprises an operating current.
Preferably, the state parameter threshold is at least one of a differential starting current, a differential current snap constant, a snap overcurrent constant, an overcurrent protection current constant, and a negative sequence protection current constant.
Preferably, the method is characterized in that the first and second parts are,
the differential starting current is the maximum unbalanced current when the differential starting current needs to be reliably avoided;
setting a differential flow speed break constant value according to the maximum unbalanced current avoiding the starting process of the motor or the external short circuit;
the quick-break overcurrent constant value is set according to the maximum starting current when the motor is normally started and considering the overload capacity of the motor;
the overcurrent protection current constant value is set according to the maximum starting current when the motor is kept away from normal starting, and meanwhile, the feedback current of the motor when the three-phase short circuit fault of the power supply bus is kept away.
Preferably, the real-time detection of the state parameter of the motor in the first step further includes the following steps:
acquiring the working current of the motor at each moment in the next preset time period and the maximum current value of the motor in the next preset time period in real time;
comparing the maximum current values in the next preset time period and the last preset time period, and if the maximum current value in the next preset time period is larger than the maximum current value in the last preset time period and smaller than a motor state parameter threshold, determining to obtain a corrected self-adaptive protection setting value of the motor according to the maximum current value of the motor in the next preset time period;
and reconfiguring the corrected self-adaptive protection setting value of the motor to a local and/or remote self-adaptive protection system, and correcting the self-adaptive protection setting value of the motor on line in real time.
Preferably, the determining whether to start the adaptive protection mode, if so, configuring the adaptive protection setting value of the motor to a local and/or remote adaptive protection system corresponding to the motor, and the method includes:
displaying the obtained maximum current value of the motor and the determined self-adaptive protection setting value of the motor;
configuring the determined self-adaptive protection setting value of the motor to a local and/or remote self-adaptive protection system corresponding to the motor according to the input confirmation password and the determined motor needing to start the self-adaptive protection mode;
informing the local and/or remote adaptive protection system to enter an adaptive protection mode.
Preferably, the determining whether to start the adaptive protection mode, if yes, configures the adaptive protection setting value of the motor to a local and/or remote adaptive protection system corresponding to the motor, and further includes:
prompting whether to start a self-adaptive protection mode;
sending a dynamic verification code for starting the self-adaptive protection mode;
and configuring the determined self-adaptive protection setting value of the motor to a local and/or remote self-adaptive protection system corresponding to the motor according to the input dynamic verification code and/or the confirmation password and the determined motor needing to start the self-adaptive protection mode.
Preferably, the adaptive protection mode includes at least one of an adaptive differential start protection mode, an adaptive differential trip protection mode, an adaptive trip overcurrent protection mode, an adaptive overcurrent protection electrical protection mode, and an adaptive negative sequence protection current protection mode.
The invention provides a self-adjusting protection method of a motor, which comprises the following steps: detecting the running state of the motor in real time, so that the current quick-break protection setting value of the motor is adaptively adjusted according to the running state of the motor; the protection of the motor can avoid the peak current during starting, protect the abnormal state parameters after stabilization, record the peak current but not protect the motor to avoid error protection when detecting that the motor is started, record the current after stabilization, and protect and set the current after stabilization. Meanwhile, if the starting peak current is abnormal, the protection circuit can also be protected. The normal starting of the motor is ensured, and the motor is not protected by mistake; but also ensures that the abnormity of the motor in the starting and normal working state can be found. And the protection reliability and accuracy are improved.
Drawings
Fig. 1 is a flow chart of a self-adjusting protection method of a motor according to the invention.
Detailed Description
The self-adjusting protection method of the motor of the invention is described in detail below with reference to the accompanying drawings.
A self-adjusting protection method of a motor is characterized by comprising the following specific steps:
the method comprises the following steps: detecting the state parameters of the motor in real time; specifically comprises
Step 1: acquiring state parameters of a motor in a preset time period and maximum state parameter values of a power distribution machine in the preset time period;
and 2, step: determining to obtain a self-adaptive protection setting value of the motor according to the maximum current value of the motor in the preset time period and the state parameter threshold of the motor;
and step 3: and determining whether the self-adaptive protection mode is started, if so, configuring the self-adaptive protection setting value of the motor to a local and/or remote self-adaptive protection system corresponding to the motor, and correcting the self-adaptive protection setting value of the motor on line in real time.
Step two: setting the state parameters, and judging whether the state parameters are normal or not;
step three: outputting a motor driving signal after judging that the state parameter is normal, and enabling the motor to work normally;
step four: stopping the motor after judging that the state parameters are abnormal;
step five: and circulating the steps.
2. The self-adjusting protection method for the motor according to claim 1, wherein the step one of detecting the state parameters of the motor in real time comprises the following steps:
the motor state parameter includes an operating current.
The state parameter threshold value is at least one of a differential starting current, a differential current quick-break constant value, a quick-break overcurrent current constant value, an overcurrent protection current constant value and a negative sequence protection current constant value.
The differential starting current is the maximum unbalanced current when the differential starting current needs to be reliably avoided;
setting a differential flow speed break constant value according to the maximum unbalanced current avoiding the starting process of the motor or the external short circuit;
the quick-break overcurrent constant value is set according to the maximum starting current when the motor is normally started and considering the overload capacity of the motor;
the overcurrent protection current constant value is set according to the maximum starting current when the motor is kept away from normal starting, and meanwhile, the feedback current of the motor when the three-phase short circuit fault of the power supply bus is kept away.
The real-time detection of the state parameters of the motor in the first step further comprises the following steps:
acquiring the working current of the motor at each moment in the next preset time period and the maximum current value of the motor in the next preset time period in real time;
comparing the maximum current values in the next preset time period and the last preset time period, and if the maximum current value in the next preset time period is larger than the maximum current value in the last preset time period and smaller than a motor state parameter threshold, determining to obtain a corrected self-adaptive protection setting value of the motor according to the maximum current value of the motor in the next preset time period;
and reconfiguring the corrected self-adaptive protection setting value of the motor to a local and/or remote self-adaptive protection system, and correcting the self-adaptive protection setting value of the motor on line in real time.
If the self-adaptive protection mode is determined to be started, configuring the self-adaptive protection setting value of the motor to a local and/or remote self-adaptive protection system corresponding to the motor if the self-adaptive protection mode is determined to be started, wherein the self-adaptive protection setting value comprises the following steps:
displaying the obtained maximum current value of the motor and the determined self-adaptive protection setting value of the motor;
according to the input confirmation password and the determined motor needing to start the self-adaptive protection mode, configuring the determined self-adaptive protection setting value of the motor to a local and/or remote self-adaptive protection system corresponding to the motor;
informing the local and/or remote adaptive protection system to enter an adaptive protection mode.
If the self-adaptive protection mode is determined to be started or not, if so, configuring the self-adaptive protection setting value of the motor to a local and/or remote self-adaptive protection system corresponding to the motor, and further comprising:
prompting whether to start an adaptive protection mode;
sending a dynamic verification code for starting the self-adaptive protection mode;
and configuring the determined self-adaptive protection setting value of the motor to a local and/or remote self-adaptive protection system corresponding to the motor according to the input dynamic verification code and/or the confirmation password and the determined motor needing to start the self-adaptive protection mode.
The self-adaptive protection mode comprises at least one of a self-adaptive differential start protection mode, a self-adaptive differential speed break protection mode, a self-adaptive speed break overcurrent protection mode, a self-adaptive overcurrent protection electric protection mode and a self-adaptive negative sequence protection current protection mode.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and all such changes or substitutions are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A self-adjusting protection method of a motor is characterized by comprising the following specific steps:
the method comprises the following steps: detecting the state parameters of the motor in real time;
step two: setting the state parameters, and judging whether the state parameters are normal or not;
step three: outputting a motor driving signal after judging that the state parameter is normal, and enabling the motor to work normally;
step four: stopping the motor after judging the state parameter is abnormal;
step five: and circulating the steps.
2. The self-adjusting protection method of the motor according to claim 1, wherein the step one of detecting the state parameters of the motor in real time comprises the following steps:
step 1: acquiring state parameters of a motor in a preset time period and maximum state parameter values of a power distribution machine in the preset time period;
and 2, step: determining to obtain a self-adaptive protection setting value of the motor according to the maximum current value of the motor in the preset time period and the state parameter threshold of the motor;
and 3, step 3: and determining whether the self-adaptive protection mode is started, if so, configuring the self-adaptive protection setting value of the motor to a local and/or remote self-adaptive protection system corresponding to the motor, and correcting the self-adaptive protection setting value of the motor on line in real time.
3. The self-adjusting protection method of an electric motor of claim 1, wherein the motor state parameter comprises operating current.
4. A method according to claim 1 or 3, wherein the condition parameter threshold is at least one of a differential starting current, a differential trip constant, a trip overcurrent constant, an overcurrent protection current constant, and a negative sequence protection current constant.
5. The self-adjusting protection method of the motor according to claim 4,
the differential starting current is the maximum unbalanced current when the differential starting current needs to reliably avoid normal;
setting a differential flow speed constant value according to the maximum unbalanced current which avoids the starting process of the motor or external short circuit;
the quick-break overcurrent constant value is set according to the maximum starting current when the motor is normally started and considering the overload capacity of the motor;
the overcurrent protection current fixed value is set according to the maximum starting current when the motor is kept away from normal starting, and meanwhile, the feedback current of the motor is also kept away when the three-phase short circuit fault of the power supply bus occurs.
6. The self-adjusting protection method of the motor according to claim 3, wherein the step one of detecting the state parameter of the motor in real time further comprises the following steps:
acquiring the working current of the motor at each moment in the next preset time period and the maximum current value of the motor in the next preset time period in real time;
comparing the maximum current values in the next preset time period and the last preset time period, and if the maximum current value in the next preset time period is larger than the maximum current value in the last preset time period and smaller than a motor state parameter threshold, determining to obtain a corrected self-adaptive protection setting value of the motor according to the maximum current value of the motor in the next preset time period;
and reconfiguring the corrected self-adaptive protection setting value of the motor to a local and/or remote self-adaptive protection system, and correcting the self-adaptive protection setting value of the motor on line in real time.
7. The self-adjusting protection method of the motor according to claim 6, wherein the determining whether to start the adaptive protection mode, if so, configuring the adaptive protection setting value of the motor to a local and/or remote adaptive protection system corresponding to the motor, and the method comprises:
displaying the obtained maximum current value of the motor and the determined self-adaptive protection setting value of the motor; configuring the determined self-adaptive protection setting value of the motor to a local and/or remote self-adaptive protection system corresponding to the motor according to the input confirmation password and the determined motor needing to start the self-adaptive protection mode;
informing the local and/or remote adaptive protection system to enter an adaptive protection mode.
8. The self-adjusting protection method of the motor according to claim 6, wherein the determining whether to start the adaptive protection mode configures the adaptive protection setting value of the motor to a local and/or remote adaptive protection system corresponding to the motor if yes, further comprising:
prompting whether to start a self-adaptive protection mode;
sending a dynamic verification code for starting the self-adaptive protection mode;
and configuring the determined self-adaptive protection setting value of the motor to a local and/or remote self-adaptive protection system corresponding to the motor according to the input dynamic verification code and/or the confirmation password and the determined motor needing to start the self-adaptive protection mode.
9. The self-adjusting protection method of an electric motor according to claim 1,
the self-adaptive protection mode comprises at least one of a self-adaptive differential start protection mode, a self-adaptive differential speed break protection mode, a self-adaptive speed break overcurrent protection mode, a self-adaptive overcurrent protection electric protection mode and a self-adaptive negative sequence protection current protection mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111682767.3A CN115333046A (en) | 2021-12-31 | 2021-12-31 | Self-adjusting protection method for motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111682767.3A CN115333046A (en) | 2021-12-31 | 2021-12-31 | Self-adjusting protection method for motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115333046A true CN115333046A (en) | 2022-11-11 |
Family
ID=83912488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111682767.3A Pending CN115333046A (en) | 2021-12-31 | 2021-12-31 | Self-adjusting protection method for motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115333046A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116191358A (en) * | 2022-11-25 | 2023-05-30 | 云南电网有限责任公司昆明供电局 | Method for improving quick-break protection performance of asynchronous motor |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3809436A1 (en) * | 1988-03-21 | 1989-10-12 | Djamschid Raseghi | Method and device for detection of current and automatic prevention of missetting of the nominal current values in electric motors |
| CN103532098A (en) * | 2013-10-12 | 2014-01-22 | 南京欧格节能科技有限公司 | Electromotor integrative protector |
| CN106026025A (en) * | 2016-07-22 | 2016-10-12 | 中国恩菲工程技术有限公司 | Adjustment and calibration method and system for motor overload protection |
| US9667060B1 (en) * | 2014-11-04 | 2017-05-30 | Google Inc. | Adjusting over current protection values during changes in load current |
| CN109428315A (en) * | 2017-08-23 | 2019-03-05 | 天津市中力神盾电子科技有限公司 | Self-adaptive protection method, device and system |
| CN111355218A (en) * | 2020-04-07 | 2020-06-30 | 南京南瑞继保电气有限公司 | Protection method and device for low-frequency starting process of generator |
-
2021
- 2021-12-31 CN CN202111682767.3A patent/CN115333046A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3809436A1 (en) * | 1988-03-21 | 1989-10-12 | Djamschid Raseghi | Method and device for detection of current and automatic prevention of missetting of the nominal current values in electric motors |
| CN103532098A (en) * | 2013-10-12 | 2014-01-22 | 南京欧格节能科技有限公司 | Electromotor integrative protector |
| US9667060B1 (en) * | 2014-11-04 | 2017-05-30 | Google Inc. | Adjusting over current protection values during changes in load current |
| CN106026025A (en) * | 2016-07-22 | 2016-10-12 | 中国恩菲工程技术有限公司 | Adjustment and calibration method and system for motor overload protection |
| CN109428315A (en) * | 2017-08-23 | 2019-03-05 | 天津市中力神盾电子科技有限公司 | Self-adaptive protection method, device and system |
| CN111355218A (en) * | 2020-04-07 | 2020-06-30 | 南京南瑞继保电气有限公司 | Protection method and device for low-frequency starting process of generator |
Non-Patent Citations (1)
| Title |
|---|
| 马鸣: "最新热电联产工程设计与生产技术工艺及应用实例指导手册 第3卷", 31 August 2007, 电力科学出版社, pages: 1197 - 1201 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116191358A (en) * | 2022-11-25 | 2023-05-30 | 云南电网有限责任公司昆明供电局 | Method for improving quick-break protection performance of asynchronous motor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108278714B (en) | Control method of air conditioner | |
| CN103441712B (en) | Encoder fault self-diagnosing method in servo drive system | |
| CN108245049B (en) | Fault processing method of food processor | |
| EP2857911A2 (en) | Systems and methods for controlling a disconnect switch via a network | |
| CN104297687A (en) | Failure monitoring and alarm system for three-phase asynchronous motor | |
| CN110360064B (en) | Wind generating set control method and wind generating set | |
| CN111327236B (en) | Emergency braking control method, system and device for permanent magnet motor | |
| CN110609578A (en) | Temperature protection method, device and system for mechanical equipment | |
| CN115333046A (en) | Self-adjusting protection method for motor | |
| CN111044901A (en) | Fault early warning method and system for double-mode shield machine | |
| CN109789796B (en) | Rectifier, electric drive system and method for charging an electrical energy store | |
| CN105529981B (en) | The method for controlling frequency converter | |
| CN113376518B (en) | Furnace belly fan fault detection method and device | |
| CN114899798A (en) | Circuit monitoring method based on three-phase motor and related equipment | |
| WO2018211889A1 (en) | Motor drive device | |
| CN105527573B (en) | Wind electric field blower generator failure recognition methods | |
| CN211089516U (en) | Motor control system applied to household appliances | |
| CN109150039B (en) | Excitation system and control method | |
| CN112647927A (en) | Automatic early warning method for power point temperature rise step type grading of drilling machine electric control system | |
| CN113471931B (en) | Power supply loop protection device and method | |
| CN213899252U (en) | Auxiliary air compressor protection device, circuit and train | |
| CN114184955B (en) | Motor fault detection method, system and storage medium | |
| CN210957762U (en) | Three-phase power supply and distribution system access total power error alarm circuit and three-phase power supply and distribution system | |
| CN220154814U (en) | Automatic control system of full-intelligent dam crest generator | |
| CN114833835B (en) | Band-type brake release detection method and device, engineering robot and medium |
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 |