CN110829389A - Breaker peak switching protection device and method and air conditioner - Google Patents
Breaker peak switching protection device and method and air conditioner Download PDFInfo
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- CN110829389A CN110829389A CN201911128911.1A CN201911128911A CN110829389A CN 110829389 A CN110829389 A CN 110829389A CN 201911128911 A CN201911128911 A CN 201911128911A CN 110829389 A CN110829389 A CN 110829389A
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- protection device
- switching
- circuit breaker
- current value
- circuit
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- 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- 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
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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Abstract
The invention discloses a breaker peak switching protection device, a breaker peak switching protection method and an air conditioner. The protection device includes: the detection module is used for detecting the impact current value generated by the circuit when the load is electrified; the control module is used for comparing the impact current value with a set current value and outputting a comparison result; and the executing mechanism is used for controlling the opening and closing reset of the protection device according to the comparison result sent by the control module. The invention can effectively distinguish switching current from operating current, avoid the misoperation of the circuit breaker when the load is switched, eliminate abnormal phenomena in the circuit and maintain the stability of the circuit.
Description
Technical Field
The invention relates to the technical field of electric appliance protection, in particular to a breaker peak switching protection device, a protection method and an air conditioner.
Background
Generally, when a user load is switched into the grid, the resulting impact is inevitable. This impact is directly proportional to the load, which is determined by the nature of the circuit itself. Based on the fixed property of the alternating current of the power grid in China, most loads are connected and directly switched by adopting the alternating current. At this time, the load is connected to the power grid and is in the peak value or the non-peak value of the grid voltage instantly. If the load is switched in at the positive and negative peak points of the grid voltage, a very large instantaneous current can be generated, so that a protection device (usually a circuit breaker) in a circuit malfunctions, and finally the load fails to start. If the power frequency (50 Hz) voltage is used, two peak points, namely a positive peak point and a negative peak point, appear in a 0.02S period, the difference voltage between a power grid and a circuit reaches the maximum at the peak points, and the impact current can easily reach hundreds of times of the rated current considering the size of a load. The impact current only appears at the switching moment and is just at the moment of the peak point of the grid voltage, so that the phenomenon has a small occurrence probability and is difficult to reproduce and capture.
The circuit breaker is analyzed in nature, and has the protection function of preventing the circuit from bearing overvoltage and overcurrent. Generally, a circuit breaker is suitable for both long-time overload protection and large-current short-circuit protection, so that control over operating loads is achieved, but the circuit breaker cannot distinguish switching current from operating current, and misoperation is often generated during switching.
Disclosure of Invention
The invention provides a protection device and a protection method for switching a peak value of a circuit breaker and an air conditioner, and aims to solve the problem of misoperation of the circuit breaker caused by the fact that a power grid is instantaneously at a grid voltage peak value when a load is connected into the power grid in the prior art.
The invention provides a protection device for switching the peak value of a circuit breaker, which comprises:
the detection module is used for detecting the impact current value generated by the circuit when the load is electrified;
the control module is used for comparing the impact current value with a set current value and outputting a comparison result;
and the executing mechanism is used for controlling the opening and closing reset of the protection device according to the comparison result sent by the control module.
The switching protection device is arranged between a power grid and a circuit breaker, when the power is on, the load controller controls the circuit breaker to be switched off, and after the power is successfully switched on, the load controller controls the circuit breaker to be switched on.
The set current value is smaller than the peak switching current or equal to the short-circuit current tripping set parameter value of the circuit breaker, and the set current value and the short-circuit current tripping set parameter value are smaller values.
Preferably, the peak switching protection device for the circuit breaker provided by the invention further comprises an alarm device, and when the number of times of opening and closing of the protection device is greater than 1, the alarm device is triggered.
The invention also provides a breaker peak switching protection method, which comprises the following steps:
when a load is electrified, detecting the impact current value generated by a circuit when the load is electrified;
judging whether the impact current value is larger than a set current value or not, and outputting a comparison result;
when the impact current value is larger than the set current value, controlling the breaker peak switching protection device to open and cut off; and when the impact current value is less than or equal to the set current value, controlling the switching-on of the peak switching protection device of the circuit breaker.
When the power is on, the load controller controls the breaker to be switched off, and after the power is successfully switched on, the load controller controls the breaker to be switched on.
Preferably, when the number of times of opening and closing of the protection device is more than 1, an alarm device is triggered.
The invention also provides an air conditioner, and when the air conditioner is powered on, the breaker peak switching protection device and the protection method are used.
Compared with the prior art, the invention has the following beneficial effects:
1. impact influence of peak switching current on the circuit breaker is effectively eliminated, and the circuit breaker is endowed with a new composite protection function of switching impact resistance;
2. switching current and operating current can be effectively distinguished, and misoperation of the circuit breaker during load switching is avoided.
3. Eliminate abnormal phenomena in the circuit and maintain its stability.
Drawings
Fig. 1 is a schematic diagram of a peak switching protection device of a circuit breaker according to the present invention;
fig. 2 is a flowchart of a peak switching protection method for a circuit breaker according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and examples. It should be understood that the following specific examples are only for illustrating the present invention and are not to be construed as limiting the present invention.
The circuit breaker has voltage and current protection. Generally, the main reasons for tripping the circuit breaker include the occurrence of a large instantaneous current in the circuit and the long-term overload operation, which can be roughly classified into two types:
(1) sudden changes in circuit load and disturbances during operation.
(2) The circuit itself is short circuited.
The overload operation is within the normal protection function range of the circuit breaker after the load circuit is started to operate, and the overload operation is not considered.
Switching current occurs in the process of electrifying the load circuit, and has the characteristics of large impact, short time limit, unavailability and the like. The peak switching current only occurs when the network voltage passes through a peak point, the impact current is larger and difficult to reproduce, and the circuit breaker is easy to trip.
In order to solve the problem that misoperation of the circuit breaker can occur when a load is electrified in the prior art, the invention provides a protection device and a protection method for avoiding misoperation when a peak value of the circuit breaker is switched on and off based on difference analysis of switching current and operating current. Aiming at the characteristic that the time point of the switching current and the characteristic that the switching current is difficult to reproduce, the technical scheme provided by the invention can enable the circuit breaker to eliminate the abnormal phenomenon of switching misoperation.
As shown in fig. 1, the protection device for switching the peak value of the circuit breaker provided by the invention mainly comprises a detection module, a control module and an execution mechanism:
the detection module is used for detecting the impact current value generated by the circuit when the load is electrified;
the control module is used for comparing the impact current value with a set current value and outputting a comparison result;
and the executing mechanism is used for controlling the opening and closing reset of the protection device according to the comparison result sent by the control module.
As shown in fig. 1, the circuit breaker protection device is installed between the grid and the circuit breaker.
The invention of the proposal is to design a protection device for avoiding the misoperation of the breaker when switching the peak value, endow the breaker with a new composite protection function for resisting switching impact, and effectively improve the stability of the breaker and the circuit.
By comparing the difference analysis of switching and operating current, the circuit breaker protection device provided by the invention has the following properties:
1. when the circuit breaker is electrified, the circuit breaker has the functions of detecting circuit impact and timely cutting off, and is mainly used for circuit cutting when peak switching current occurs, so that the tripping response of the circuit breaker is avoided;
2. the characteristic of automatic reset is mainly used for avoiding larger peak switching current at a certain moment and enabling the load to be connected with power-on again. When the load has been powered up, the circuit breaker protection device can be shielded out of the circuit and no longer monitor the current of the circuit.
3. The circuit breaker protection device and the circuit breaker have an interlocking function. When the power is on, the load controller controls the breaker to be switched off, and after the power is successfully switched on, the load controller controls the breaker to be switched on.
The protection device for switching the peak value of the circuit breaker further comprises an alarm device, and when the number of times of opening and closing of the protection device is more than 1, the alarm device is triggered.
The operation of the circuit breaker protection device is briefly described as follows:
when the load is electrified, the switching protection device is connected with the circuit and is used for detecting circuit impact and timely cutting off connection with a power grid when the detected impact current exceeds a design value. The switching protection device detects the current value of the power grid before the circuit breaker detects the current value of the power grid, compares the current value with a set value, and then returns a response according to different results. The current set value Id is slightly smaller than the peak switching current, if the short-circuit current trip set parameter value exists in the circuit breaker, the current set value Id is basically equal to the trip set value, and the smaller value of the current set value Id and the trip set value is taken as the standard.
If the impact generated by the power grid current is small during power-on, the switching protection device does not respond, and the load can be normally powered on and run. If the impact generated by the current is larger and exceeds the set value Id, the protection device should cut off the circuit in advance to avoid the tripping action of the breaker, and then the judgment process is started again. It has been explained above that the peak switching current occurs at a particular time, i.e. only two peak points, positive and negative, occur within a 0.02S period. This means that it is substantially impossible to have two consecutive peak impacts. Therefore, the protection device is set to be switched on again by the power-on of the reset spring to the power grid side voltage after the protection device is switched off after the protection device is impacted for the first time and the time is delayed by T1. If the protection device is continuously disconnected, the circuit is judged to have a fault, and related personnel are required to check. By the method, the characteristics of the current can be effectively distinguished and corresponding actions can be performed, and misoperation during switching of the peak value of the circuit breaker is effectively avoided.
In order to avoid the conflict between the protection function of the protection device and the protection function of the circuit breaker on the circuit, the circuit breaker protection device needs to be shielded out of the whole circuit system after the load is normally powered on and operated. That is to say, the switching protection device acts on the power-on moment without generating negative influence on the circuit, thereby effectively improving the stability of the circuit.
Fig. 2 is a flowchart of a peak switching protection method for a circuit breaker according to the present invention. In this embodiment, the method for protecting the peak switching of the circuit breaker provided by the present invention includes the following steps:
when a load is electrified, detecting the impact current value generated by a circuit when the load is electrified;
judging whether the impact current value is larger than a set current value or not, and outputting a comparison result;
when the impact current value is larger than the set current value, controlling the breaker peak switching protection device to open and cut off; and when the impact current value is less than or equal to the set current value, controlling the switching-on of the peak switching protection device of the circuit breaker.
The switching protection device is arranged between a power grid and the circuit breaker, when the power is on, the load controller controls the circuit breaker to be switched off, and after the power is successfully switched on, the load controller controls the circuit breaker to be switched on.
And when the switching-off and switching-off times of the switching protection device are more than 1, triggering an alarm device.
The invention also provides an air conditioner, and when the air conditioner is powered on, the breaker peak switching protection device and the protection method are used.
The circuit breaker protection device and the circuit breaker protection method can effectively distinguish the self characteristics of the current and carry out corresponding action protection. When the unit is electrified, the switching protection device has a current impact detection function and reacts before the circuit breaker. If the current mutation is within the normal range, the switching protection device can not perform protection action. After the power-on is successful, if the current mutation is overlarge, namely the peak point is switched in, the switching protection device firstly trips the circuit breaker, and automatically closes and switches in again after a little time delay. By using the method, the circuit can avoid the peak point, so that the breaker is prevented from false tripping failure of the peak value. After the load is successfully electrified and operated, the circuit breaker protection device is shielded out of the whole circuit system, so that the protection conflict with the self-set protection of the circuit is avoided, and the stability of the whole system is effectively improved.
The foregoing is considered as illustrative only of the embodiments of the invention. It should be understood that any modifications, equivalents and changes made within the spirit and framework of the inventive concept are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a circuit breaker peak value switching protection device which characterized in that includes:
the detection module is used for detecting the impact current value generated by the circuit when the load is electrified;
the control module is used for comparing the impact current value with a set current value and outputting a comparison result;
and the actuating mechanism is used for controlling the switching-off and switching-on resetting of the switching protection device according to a comparison result sent by the control module.
2. The protection device of claim 1, wherein the switching protection device is installed between a power grid and a circuit breaker, and when the power is turned on, the load controller controls the circuit breaker to be switched off, and when the power is successfully turned on, the load controller controls the circuit breaker to be switched on.
3. The protection device of claim 2, wherein the set current value is less than a peak switching current or equal to a short circuit current trip set parameter value of the circuit breaker, whichever is smaller.
4. The protection device of claim 2, further comprising an alarm device that is triggered when the number of times the protection device is tripped is greater than 1.
5. A peak switching protection method for a circuit breaker is characterized by comprising the following steps:
when a load is electrified, detecting the impact current value generated by a circuit when the load is electrified;
judging whether the impact current value is larger than a set current value or not, and outputting a comparison result;
when the impact current value is larger than the set current value, controlling the breaker peak switching protection device to open and cut off; and when the impact current value is less than or equal to the set current value, controlling the switching-on of the peak switching protection device of the circuit breaker.
6. The protection method of claim 5, wherein the load controller controls the breaker to open and close when power is supplied, and the load controller controls the breaker to close and open when power is supplied successfully.
7. The protection method according to claim 5, wherein the set current value is smaller than the peak switching current or equal to a short circuit current trip set parameter value of the circuit breaker, whichever is smaller.
8. The protection method according to claim 5, characterized in that an alarm device is triggered when the number of times of opening of the protection device is greater than 1.
9. An air conditioner, characterized in that, when the air conditioner is powered on, the peak switching protection device of the circuit breaker of any one of claims 1 to 4 is used.
10. An air conditioner, characterized in that, when the air conditioner is powered on, the peak switching protection method of the circuit breaker according to any one of claims 5 to 8 is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911128911.1A CN110829389A (en) | 2019-11-18 | 2019-11-18 | Breaker peak switching protection device and method and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911128911.1A CN110829389A (en) | 2019-11-18 | 2019-11-18 | Breaker peak switching protection device and method and air conditioner |
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| Publication Number | Publication Date |
|---|---|
| CN110829389A true CN110829389A (en) | 2020-02-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911128911.1A Pending CN110829389A (en) | 2019-11-18 | 2019-11-18 | Breaker peak switching protection device and method and air conditioner |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101534005A (en) * | 2009-04-09 | 2009-09-16 | 哈尔滨工业大学 | Suppressing circuit of power-on impact current |
| US20110085274A1 (en) * | 2008-07-05 | 2011-04-14 | Qinetiq Limited | Circuit breaker |
| CN204557118U (en) * | 2015-03-26 | 2015-08-12 | 广东美的制冷设备有限公司 | A kind of air conditioner and Intelligent Power Module power-on protective circuit thereof |
| CN204965104U (en) * | 2015-09-17 | 2016-01-13 | 广东美的制冷设备有限公司 | Air conditioner and last electricity and current foldback circuit of intelligence power module thereof |
| CN105870874A (en) * | 2016-04-28 | 2016-08-17 | 上海斐讯数据通信技术有限公司 | Over-current protection circuit |
-
2019
- 2019-11-18 CN CN201911128911.1A patent/CN110829389A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110085274A1 (en) * | 2008-07-05 | 2011-04-14 | Qinetiq Limited | Circuit breaker |
| CN101534005A (en) * | 2009-04-09 | 2009-09-16 | 哈尔滨工业大学 | Suppressing circuit of power-on impact current |
| CN204557118U (en) * | 2015-03-26 | 2015-08-12 | 广东美的制冷设备有限公司 | A kind of air conditioner and Intelligent Power Module power-on protective circuit thereof |
| CN204965104U (en) * | 2015-09-17 | 2016-01-13 | 广东美的制冷设备有限公司 | Air conditioner and last electricity and current foldback circuit of intelligence power module thereof |
| CN105870874A (en) * | 2016-04-28 | 2016-08-17 | 上海斐讯数据通信技术有限公司 | Over-current protection circuit |
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Application publication date: 20200221 |
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