CN112803586B - Automatic setting method and device for rated parameters of circuit breaker and circuit breaker - Google Patents
Automatic setting method and device for rated parameters of circuit breaker and circuit breaker Download PDFInfo
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- CN112803586B CN112803586B CN202011571304.5A CN202011571304A CN112803586B CN 112803586 B CN112803586 B CN 112803586B CN 202011571304 A CN202011571304 A CN 202011571304A CN 112803586 B CN112803586 B CN 112803586B
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000001514 detection method Methods 0.000 claims abstract description 48
- 230000004224 protection Effects 0.000 description 10
- 230000003750 conditioning effect Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000005070 sampling Methods 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses an automatic setting method for rated parameters of a circuit breaker. Comparing the voltage detection value with a plurality of preset rated voltage values with different grades, selecting an optimal preset rated voltage value from the voltage detection value and setting the rated voltage of the circuit breaker according to the optimal preset rated voltage value: if the voltage detection value falls into a first floating range corresponding to at least one preset rated voltage value, taking the higher preset rated voltage value as the optimal preset rated voltage value, otherwise, judging whether the voltage detection value falls into a second floating range corresponding to at least one preset rated voltage value, if so, taking the higher preset rated voltage value as the optimal preset rated voltage value, and if not, judging that the setting fails; the second floating range includes and is greater than the first floating range. The invention also discloses a device for automatically setting the rated parameters of the circuit breaker and the circuit breaker. The invention can automatically set the rated parameters of the circuit breaker and has low realization cost.
Description
Technical Field
The invention relates to the technical field of circuit breakers, in particular to a method and a device for automatically setting rated parameters of a circuit breaker.
Background
Circuit breakers, which are important components in power distribution systems, are burdened with the important task of protecting the distribution network and electrical equipment from faults such as overload, short circuits, and electrical leakage. The intelligent controller is a core detection and control unit of the circuit breaker, has more and more functions for adapting to the development of the intelligent power grid, and has additional protection such as voltage protection, frequency protection, power protection and the like besides the traditional current protection function. These additional protections of circuit breakers are generally directly related to the voltage, frequency of the distribution line, and also 50Hz, 60Hz, as the distribution line has various levels of voltage values, such as 400V, 440V, 500V, 690V, 1000V, etc. Therefore, the rated voltage and the operating frequency of the circuit breaker need to be matched with the voltage and the frequency of the distribution line before the circuit breaker is put into operation. Conventional matching methods are generally classified into two types: the rated voltage and the working frequency are selected for a user when the breaker is purchased, and are set by a manufacturer when the breaker leaves a factory, and the method does not need to be set by the user, but has insufficient expansibility for the use of the breaker, and has more specifications when the user prepares parts; the other is to set the breaker on site for the user, which is flexible, but has high requirements for site operators, and can cause serious consequences once the rated voltage and the working frequency are not properly configured.
Disclosure of Invention
The invention aims to solve the technical problems of overcoming the defects of the prior art and providing the method for automatically setting the rated parameters of the circuit breaker, which can automatically set the rated parameters of the circuit breaker including rated voltage, and has low realization cost.
The technical scheme adopted by the invention specifically solves the technical problems as follows:
the automatic setting method of rated parameters of the circuit breaker comprises the following specific steps: detecting the voltage of a distribution line; comparing the voltage detection value with a plurality of preset rated voltage values with different grades, selecting an optimal preset rated voltage value from the voltage detection values according to the following method, and setting the rated voltage of the circuit breaker according to the optimal preset rated voltage value: judging whether the voltage detection value falls into a first floating range corresponding to at least one preset rated voltage value, if so, taking the higher preset rated voltage value in the plurality of the preset rated voltage values as the optimal preset rated voltage value, if not, continuously judging whether the voltage detection value falls into a second floating range corresponding to the at least one preset rated voltage value, if so, taking the higher preset rated voltage value in the plurality of the preset rated voltage values as the optimal preset rated voltage value, and if not, judging that the rated voltage automatic setting fails; wherein the second floating range includes and is greater than the first floating range.
Further, the automatic setting method of the rated parameters of the circuit breaker further comprises automatic setting of rated working frequency, and specifically comprises the following steps:
detecting the frequency of a distribution line; comparing the frequency detection value with a plurality of preset rated operating frequency values of different grades, selecting an optimal preset rated operating frequency value from the frequency detection values according to the following method, and setting the rated operating frequency of the circuit breaker according to the optimal preset rated operating frequency value: judging whether the frequency detection value only falls into a third floating range corresponding to a preset rated operating frequency value, if so, taking the fallen preset rated operating frequency value as an optimal preset rated operating frequency value, and if not, judging that the automatic setting of the rated operating frequency fails.
Preferably, the plurality of different preset rated operating frequency values include: 50Hz, 60Hz.
Preferably, for a certain preset rated voltage value Ue-x, the corresponding first floating range and second floating range are respectively [ K1×ue-x, K2×ue-x ], [ K3×ue-x, K4×ue-x ]; wherein 0< K3< K1< K2< K4.
Preferably, the plurality of different preset rated voltage values include: 400V, 440V, 500V, 690V, 800V, 1000V, 1140V.
The following technical scheme can be obtained based on the same inventive concept:
the utility model provides an automatic setting device of rated parameter of circuit breaker, includes the automatic setting unit of rated voltage, the automatic setting unit of rated voltage specifically includes:
the voltage detection module is used for detecting the voltage of the distribution line;
the voltage configuration module is used for comparing the voltage detection value with a plurality of preset rated voltage values with different grades, selecting an optimal preset rated voltage value from the voltage detection values according to the following method, and setting the rated voltage of the circuit breaker according to the optimal preset rated voltage value: judging whether the voltage detection value falls into a first floating range corresponding to at least one preset rated voltage value, if so, taking the higher preset rated voltage value in the plurality of the preset rated voltage values as the optimal preset rated voltage value, if not, continuously judging whether the voltage detection value falls into a second floating range corresponding to the at least one preset rated voltage value, if so, taking the higher preset rated voltage value in the plurality of the preset rated voltage values as the optimal preset rated voltage value, and if not, judging that the rated voltage automatic setting fails;
wherein the second floating range includes and is greater than the first floating range.
Further, the automatic setting device for rated parameters of the circuit breaker further comprises an automatic setting unit for rated operating frequency, and the automatic setting unit for rated operating frequency specifically comprises:
the frequency detection module is used for detecting the frequency of the distribution line;
the frequency configuration module is used for comparing the frequency detection value with a plurality of preset rated operating frequency values of different grades, selecting an optimal preset rated operating frequency value from the frequency detection values according to the following method, and setting the rated operating frequency of the circuit breaker according to the optimal preset rated operating frequency value: judging whether the frequency detection value only falls into a third floating range corresponding to a preset rated operating frequency value, if so, taking the fallen preset rated operating frequency value as an optimal preset rated operating frequency value, and if not, judging that the automatic setting of the rated operating frequency fails.
Preferably, the number of different preset nominal operating frequency values comprises 50Hz, 60Hz.
Preferably, for a certain preset rated voltage value Ue-x, the corresponding first floating range and second floating range are respectively [ K1×ue-x, K2×ue-x ], [ K3×ue-x, K4×ue-x ]; wherein 0< K3< K1< K2< K4.
Preferably, the plurality of different preset rated voltage values include: 400V, 440V, 500V, 690V, 800V, 1000V, 1140V.
A circuit breaker comprising the automatic setting device for rated parameters of the circuit breaker according to any one of the above technical schemes.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the technical scheme of the invention can realize automatic monitoring of the voltage and frequency of the distribution line and automatic setting of the rated voltage and the working frequency of the circuit breaker according to the monitoring result, can avoid abnormal measurement and protection functions of the circuit breaker caused by improper manual setting, effectively improves the safety and reliability of the circuit breaker, has simple and easy parameter automatic setting algorithm, occupies less resources for an intelligent controller, and can be easily realized on the existing intelligent circuit breaker through simple software updating.
Drawings
Fig. 1 is a block diagram showing a specific circuit configuration of a circuit breaker according to the present invention;
FIG. 2 is a specific implementation flow of automatic rated voltage setting;
fig. 3 is a specific implementation flow of automatic setting of the rated operating frequency.
Detailed Description
Aiming at the defects existing in the prior art, the method provided by the invention has the advantages that the voltage and the frequency of the field distribution line are detected and are rapidly matched with a series of preset rated voltage values and rated working frequency values, so that the automatic setting of the rated voltage and the rated working frequency of the circuit breaker is realized, and the requirement on the capability of field installation personnel is reduced, and meanwhile, the safety and the reliability of the system are improved.
Specifically, the invention provides a method for automatically setting rated parameters of a circuit breaker, which comprises the following steps of:
detecting the voltage of a distribution line; comparing the voltage detection value with a plurality of preset rated voltage values with different grades, selecting an optimal preset rated voltage value from the voltage detection values according to the following method, and setting the rated voltage of the circuit breaker according to the optimal preset rated voltage value: judging whether the voltage detection value falls into a first floating range corresponding to at least one preset rated voltage value, if so, taking the higher preset rated voltage value in the plurality of the preset rated voltage values as the optimal preset rated voltage value, if not, continuously judging whether the voltage detection value falls into a second floating range corresponding to the at least one preset rated voltage value, if so, taking the higher preset rated voltage value in the plurality of the preset rated voltage values as the optimal preset rated voltage value, and if not, judging that the rated voltage automatic setting fails; wherein the second floating range includes and is greater than the first floating range.
Further, the automatic setting method of the rated parameters of the circuit breaker further comprises automatic setting of rated working frequency, and specifically comprises the following steps:
detecting the frequency of a distribution line; comparing the frequency detection value with a plurality of preset rated operating frequency values of different grades, selecting an optimal preset rated operating frequency value from the frequency detection values according to the following method, and setting the rated operating frequency of the circuit breaker according to the optimal preset rated operating frequency value: judging whether the frequency detection value only falls into a third floating range corresponding to a preset rated operating frequency value, if so, taking the fallen preset rated operating frequency value as an optimal preset rated operating frequency value, and if not, judging that the automatic setting of the rated operating frequency fails.
For the convenience of public understanding, the following detailed description of the technical solution of the present invention will be given with reference to the accompanying drawings by way of a specific example:
the circuit structure of the circuit breaker of the embodiment is shown in fig. 1, and comprises an AC/DC circuit, a voltage conditioning circuit, a frequency sampling circuit, a Microcontroller (MCU) circuit, a memory and a tripping circuit; the AC/DC circuit directly takes power from the main loop, and generates a system power supply after voltage reduction to supply power for other circuits; the voltage conditioning circuit samples the main loop voltage, the input end of the voltage conditioning circuit is connected to the main loop, and the output end of the voltage conditioning circuit is connected to the MCU circuit and the frequency sampling circuit; the MCU circuit receives and processes output signals of the voltage conditioning circuit and the frequency sampling circuit respectively, calculates the voltage and the frequency of the distribution line, and sets the rated voltage and the working frequency of the circuit breaker; when the voltage and frequency signals are monitored to exceed the protection set values, the MCU circuit sends out control signals to enable the tripping driving circuit to act, so that the breaker is broken; the memory is used for storing rated voltage, working frequency and protection set values of the circuit breaker.
Fig. 2 shows a setting flow of rated voltage of the circuit breaker, which includes the following steps:
a. the intelligent controller samples the distribution line voltage to obtain a distribution line voltage detection value U;
b. the intelligent controller reads a plurality of built-in breaker preset rated voltage values Ue-x (Ue-x in the embodiment is Ue-0, ue-1, ue-2, ue-3, ue-4, ue-5 and Ue-6, which respectively indicate that the rated voltage of the breaker is 400V, 440V, 500V, 690V, 800V, 1000V and 1140V) and respectively compares the rated voltage with a voltage detection value U, and when only one Ue-x meets K1, ue-x is less than or equal to U and less than or equal to K2, the rated voltage of the breaker is automatically set as Ue-x, otherwise, the operation is switched;
c. if the U is less than or equal to K2, and the U is more than or equal to K1, the rated voltage of the circuit breaker is automatically set to be Ue- (x+1), and if the conditions are not met, d is converted;
d. if the Ue-x satisfies K3-Ue-x not more than U not more than K4-Ue-x and U not more than K3-Ue- (x+1), automatically setting the rated voltage of the circuit breaker to be Ue-x, otherwise, converting to e;
e. when U simultaneously satisfies U is less than or equal to K4-Ue-x and U is more than or equal to K3-Ue- (x+1), the rated voltage of the circuit breaker is automatically set to Ue- (x+1), otherwise, f is converted;
f. the automatic setting of the rated voltage fails, and the intelligent controller sends out an abnormal rated voltage alarm signal.
Wherein 0< k3< k1< k2< k4; in this example, K1 was 0.95, K2 was 1.05, K3 was 0.9, and K4 was 1.1.
In this embodiment, in order to perform setting faster in a specific occasion, for example, corresponding to a specific matched distribution line, the rated voltage Ue is preset in the controller, and the preset rated voltage Ue may be read and compared with the distribution line voltage preferentially, which may be omitted in other occasions.
Fig. 3 shows a setting flow of rated operating frequency of the circuit breaker, which includes the following steps:
a. the intelligent controller samples the distribution line frequency to obtain a distribution line frequency detection value f;
b. the intelligent controller reads a plurality of preset rated operating frequency values fx of the built-in circuit breaker and compares the values with a frequency detection value f, and when K5 is less than or equal to f and less than or equal to K6 is less than or equal to fx, the operating frequency of the circuit breaker is automatically set to fx; if the frequency of K5 x fx is less than or equal to f and less than or equal to K6 x fx, judging that the automatic setting of the rated operating frequency fails, and sending out an abnormal alarm signal of the rated operating frequency by the intelligent controller.
Fx in the embodiment is f0 and f1, which respectively represent the rated working frequencies of 50Hz and 60Hz of the circuit breaker; the value of K5 is 0.95, and the value of K6 is 1.05.
In this embodiment, in order to perform setting faster in a specific occasion, for example, corresponding to a specific matched distribution line, the rated operating frequency fo is preset in the controller, and the preset rated operating frequency fo may be read preferentially and compared with the distribution line frequency, and of course, in other occasions, this step may be omitted.
The obtaining mode of the line voltage measurement value U may also be: sampling the distribution line voltage for a duration of T and calculating an average voltage measurement U T ，U T As U; the obtaining mode of the distribution line frequency value f can be as follows: sampling the distribution line frequency for a duration of T and calculating an average frequency measurement f T ，f T As f.
By adopting the technical scheme, the intelligent controller automatically monitors the voltage and the frequency of the distribution line and sets the rated voltage and the working frequency of the circuit breaker, so that the abnormal measurement and the protection function of the circuit breaker caused by improper manual setting can be avoided, and the rated voltage and the working frequency of the circuit breaker are not required to be set manually, so that the labor cost can be saved, and the efficiency is improved.
Claims (9)
1. The automatic setting method for the rated parameters of the circuit breaker is characterized by comprising the following steps of:
detecting the voltage of a distribution line; comparing the voltage detection value with a plurality of preset rated voltage values with different grades, selecting an optimal preset rated voltage value from the voltage detection values according to the following method, and setting the rated voltage of the circuit breaker according to the optimal preset rated voltage value: judging whether the voltage detection value falls into a first floating range corresponding to at least one preset rated voltage value, if so, taking the higher preset rated voltage value in the plurality of the preset rated voltage values as the optimal preset rated voltage value, if not, continuously judging whether the voltage detection value falls into a second floating range corresponding to the at least one preset rated voltage value, if so, taking the higher preset rated voltage value in the plurality of the preset rated voltage values as the optimal preset rated voltage value, and if not, judging that the rated voltage automatic setting fails; wherein the second floating range includes and is greater than the first floating range; for a certain preset rated voltage value Ue-x, the corresponding first floating range and second floating range are respectively [ K1 x Ue-x, K2 x Ue-x ], [ K3 x Ue-x, K4 x Ue-x ]; wherein 0< K3< K1< K2< K4.
2. The automatic setting method of rated parameters of circuit breaker according to claim 1, further comprising automatic setting of rated operating frequency, specifically as follows:
detecting the frequency of a distribution line; comparing the frequency detection value with a plurality of preset rated operating frequency values of different grades, selecting an optimal preset rated operating frequency value from the frequency detection values according to the following method, and setting the rated operating frequency of the circuit breaker according to the optimal preset rated operating frequency value: judging whether the frequency detection value only falls into a third floating range corresponding to a preset rated operating frequency value, if so, taking the fallen preset rated operating frequency value as an optimal preset rated operating frequency value, and if not, judging that the automatic setting of the rated operating frequency fails.
3. The automatic setting method of rated parameters of circuit breaker according to claim 2, wherein the preset rated operating frequency values of the several different levels include 50Hz and 60Hz.
4. The automatic setting method of rated parameters of circuit breaker according to claim 1 or 2, wherein the several different preset rated voltage values include: 400V, 440V, 500V, 690V, 800V, 1000V, 1140V.
5. The utility model provides a rated parameter automatic setting device of circuit breaker, its characterized in that includes rated voltage automatic setting unit, rated voltage automatic setting unit specifically includes:
the voltage detection module is used for detecting the voltage of the distribution line;
the voltage configuration module is used for comparing the voltage detection value with a plurality of preset rated voltage values with different grades, selecting an optimal preset rated voltage value from the voltage detection values according to the following method, and setting the rated voltage of the circuit breaker according to the optimal preset rated voltage value: judging whether the voltage detection value falls into a first floating range corresponding to at least one preset rated voltage value, if so, taking the higher preset rated voltage value in the plurality of the preset rated voltage values as the optimal preset rated voltage value, if not, continuously judging whether the voltage detection value falls into a second floating range corresponding to the at least one preset rated voltage value, if so, taking the higher preset rated voltage value in the plurality of the preset rated voltage values as the optimal preset rated voltage value, and if not, judging that the rated voltage automatic setting fails; wherein the second floating range includes and is greater than the first floating range; for a certain preset rated voltage value Ue-x, the corresponding first floating range and second floating range are respectively [ K1 x Ue-x, K2 x Ue-x ], [ K3 x Ue-x, K4 x Ue-x ]; wherein 0< K3< K1< K2< K4.
6. The automatic setting device for rated parameters of circuit breaker according to claim 5, further comprising an automatic setting unit for rated operating frequency, said automatic setting unit for rated operating frequency comprising:
the frequency detection module is used for detecting the frequency of the distribution line;
the frequency configuration module is used for comparing the frequency detection value with a plurality of preset rated operating frequency values of different grades, selecting an optimal preset rated operating frequency value from the frequency detection values according to the following method, and setting the rated operating frequency of the circuit breaker according to the optimal preset rated operating frequency value: judging whether the frequency detection value only falls into a third floating range corresponding to a preset rated operating frequency value, if so, taking the fallen preset rated operating frequency value as an optimal preset rated operating frequency value, and if not, judging that the automatic setting of the rated operating frequency fails.
7. The automatic setting device for rated parameters of circuit breaker according to claim 6, wherein the preset rated operating frequency values of the several different levels include 50Hz and 60Hz.
8. The automatic setting device for rated parameters of circuit breaker according to claim 5 or 6, wherein said plurality of different preset rated voltage values comprises: 400V, 440V, 500V, 690V, 800V, 1000V, 1140V.
9. A circuit breaker comprising an automatic setting device for rated parameters of the circuit breaker according to any one of claims 5 to 8.
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| CN202011571304.5A CN112803586B (en) | 2020-12-27 | 2020-12-27 | Automatic setting method and device for rated parameters of circuit breaker and circuit breaker |
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| CN202011571304.5A CN112803586B (en) | 2020-12-27 | 2020-12-27 | Automatic setting method and device for rated parameters of circuit breaker and circuit breaker |
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| CN112803586B true CN112803586B (en) | 2023-05-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3428210B2 (en) * | 1995-02-22 | 2003-07-22 | 松下電工株式会社 | Distribution circuit breaker |
| CN2691156Y (en) * | 2003-09-09 | 2005-04-06 | 维熹科技股份有限公司 | Multi-purpose transformer power supply device |
| CN103560498B (en) * | 2013-11-21 | 2017-04-26 | 国家电网公司 | Method for selecting nominal voltage of lightening arrester in ultrahigh-voltage system |
| CN106099833A (en) * | 2016-06-08 | 2016-11-09 | 浙江中凯科技股份有限公司 | A kind of electric current or voltage setting method and device |
| CN106602498A (en) * | 2017-03-06 | 2017-04-26 | 浙江中凯科技股份有限公司 | Method and apparatus for setting low-voltage electric appliance rated parameters |
| CN108807101A (en) * | 2018-06-19 | 2018-11-13 | 李秀才 | The breaker of tracking load variation automatic adjusting rated value |
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