CN115184793A - Low-voltage circuit breaker and method and device for identifying terminal fault thereof - Google Patents
Low-voltage circuit breaker and method and device for identifying terminal fault thereof Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/04—Means for indicating condition of the switching device
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/04—Means for indicating condition of the switching device
- H01H2071/044—Monitoring, detection or measuring systems to establish the end of life of the switching device, can also contain other on-line monitoring systems, e.g. for detecting mechanical failures
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Abstract
The invention provides a low-voltage circuit breaker and a method and a device for identifying terminal faults thereof, wherein the method comprises the following steps: calculating a characteristic value for representing contact resistance according to the temperature value and the current value of the low-voltage circuit breaker terminal in advance; acquiring an actual temperature value and an actual current value of the low-voltage circuit breaker terminal, and calculating to obtain an actual temperature rise value of the low-voltage circuit breaker terminal according to the actual temperature value and the actual current value; and determining the state of the low-voltage circuit breaker terminal according to the actual temperature rise value and the characteristic value. According to the method for identifying the fault of the low-voltage circuit breaker terminal, whether the terminal of the low-voltage circuit breaker has the fault or not can be identified only by utilizing the terminal temperature and the current of the low-voltage circuit breaker, the environmental temperature does not need to be measured, and the economic cost can be saved.
Description
Technical Field
The invention belongs to the technical field of circuit breakers, and particularly relates to a low-voltage circuit breaker and a method and a device for identifying a terminal fault of the low-voltage circuit breaker.
Background
The low-voltage circuit breaker wiring terminal is an important electrical component for connecting a circuit breaker self conductor and a cable, and is also one of main heat sources for generating heat of the circuit breaker. The direct reason for overheating of the connecting terminal of the low-voltage circuit breaker is that the circuit breaker generates heat abnormally when operating within a rated load current due to the fact that contact resistance between the connecting terminal and a conductor is increased.
Cause low-voltage circuit breaker binding post to appear that contact resistance is too big and the unusual reason of temperature rise that produces has a variety, includes: the wiring terminal is poor in working environment, dust deposition, air pollution and electric abrasion at the wiring terminal are caused, the contact surface of a terminal connection part and a lead is degraded, mechanical vibration caused by electric power generated by circuit breaker operation enables the terminal to be loose, and the wiring terminal generated by the fact that a constructor cannot be installed in place is loose.
The traditional method for detecting the poor contact of the low-voltage circuit breaker terminal adopts a universal meter to measure the resistance of the terminal, but cannot detect in real time. With the progress of technology, in recent years, a detection method has been developed which can determine a contact state of a terminal by using a relationship between a current and a temperature rise and a contact resistance of the terminal.
One of the prior art, chinese granted patent CN102243285B, proposes a technical scheme for calculating the operating current and temperature rise of a circuit breaker in real time and comparing the calculated current and temperature rise with a standard temperature rise by using the standard temperature rise at different currents as a determination threshold, and determining that the circuit breaker is in poor contact when the standard temperature rise is exceeded. And because of reasons such as cost, product structural integrity and circuit breaker volume, partial circuit breaker producer only installs three-phase temperature sensor and does not install ambient temperature sensor, leads to the ambient temperature that can't acquire the circuit breaker to unable calculation temperature rise just also can't discern whether the circuit breaker breaks down.
Disclosure of Invention
The invention aims to solve at least one technical problem in the prior art and provides a low-voltage circuit breaker and a method and a device for identifying a terminal fault of the low-voltage circuit breaker.
In one aspect of the present invention, there is provided a method for identifying a terminal fault of a low-voltage circuit breaker, the method comprising:
calculating a characteristic value for representing contact resistance according to the temperature value and the current value of the low-voltage circuit breaker terminal in advance;
acquiring an actual temperature value and an actual current value of the low-voltage circuit breaker terminal, and calculating to obtain an actual temperature rise value of the low-voltage circuit breaker terminal according to the actual temperature value and the actual current value;
and determining the state of the low-voltage circuit breaker terminal according to the actual temperature rise value and the characteristic value.
Optionally, the determining the state of the low-voltage circuit breaker terminal according to the actual temperature rise value and the characteristic value includes:
calculating to obtain a standard relative temperature rise conversion value according to the actual current value and the standard relative temperature rise value;
if the actual temperature rise value is larger than the standard relative temperature rise conversion value, judging that a fault exists in the low-voltage circuit breaker terminal; and the number of the first and second groups,
and if the actual temperature rise value is smaller than the standard relative temperature rise conversion value, judging that the low-voltage circuit breaker terminal is normal.
Optionally, the calculating, according to the temperature value and the current value of the low-voltage circuit breaker terminal in advance, to obtain a characteristic value for characterizing the contact resistance includes:
acquiring sampling temperature values corresponding to sampling current values at preset step lengths based on the rated current of the low-voltage circuit breaker;
and respectively calculating the standard relative temperature rise value under the change of each two adjacent sampling current values based on the sampling temperature value corresponding to each sampling current value.
Optionally, the characteristic value is a standard temperature rise value of the terminal respectively at different current values measured in advance;
the calculating according to the actual temperature value and the actual current value to obtain the actual temperature rise value of the low-voltage circuit breaker terminal comprises the following steps:
inputting the actual temperature value and the actual current value into a pre-trained temperature rise prediction model, and predicting to obtain the actual temperature rise value; the temperature rise prediction model is used for representing the corresponding relation among the terminal temperature, the current and a temperature rise value, and the temperature rise value is the difference value of the terminal temperature and the environment temperature;
determining the state of the low-voltage circuit breaker terminal according to the actual temperature rise value and the characteristic value comprises the following steps:
if the actual temperature rise value is larger than the standard temperature rise value, judging that a fault exists at the low-voltage circuit breaker terminal; and (c) a second step of,
and if the actual temperature rise value is smaller than the standard temperature rise value, judging that the low-voltage circuit breaker terminal is normal.
Optionally, the temperature rise prediction model is specifically trained as follows:
acquiring a training data set of the low-voltage circuit breaker terminal, wherein the training data set comprises a temperature value, a current value and a temperature rise value of the terminal;
and training the temperature rise prediction model by taking the temperature value and the current value of the terminal as input and the temperature rise value as output to obtain the trained temperature rise prediction model.
Optionally, the characteristic value is a temperature deviation threshold, and the actual temperature rise value is an actual temperature maximum deviation value; the calculating according to the actual temperature value and the actual current value to obtain the actual temperature rise value of the low-voltage circuit breaker terminal comprises the following steps:
calculating to obtain the actual current maximum deviation value of each phase terminal according to the actual current value of each phase terminal of the low-voltage circuit breaker;
and calculating to obtain the actual temperature maximum deviation value of each phase terminal according to each phase terminal temperature value corresponding to each phase actual current value of each phase terminal of the low-voltage circuit breaker.
Optionally, the determining the state of the low-voltage circuit breaker terminal according to the actual temperature rise value and the characteristic value includes:
determining a corresponding actual deviation interval based on the actual current maximum deviation value, and determining an actual temperature deviation threshold according to the actual deviation interval;
if the actual temperature maximum deviation value is larger than the actual temperature deviation threshold value, judging that a fault exists at the low-voltage circuit breaker terminal; and the number of the first and second groups,
and if the actual temperature maximum deviation value is smaller than the actual temperature deviation threshold value, judging that the low-voltage circuit breaker terminal is normal.
Optionally, the calculating, according to the temperature value and the current value of the low-voltage circuit breaker terminal in advance, to obtain a characteristic value for characterizing the contact resistance includes:
acquiring the maximum deviation value of the sampling current in each deviation interval;
and calculating the corresponding temperature deviation threshold value in the deviation interval according to the sampling temperature maximum deviation value corresponding to the sampling current maximum deviation value in each deviation interval.
In another aspect of the present invention, there is provided an apparatus for identifying a terminal fault of a low voltage circuit breaker, the apparatus comprising:
the control module is used for calculating a characteristic value for representing the contact resistance according to the temperature value and the current value of the low-voltage circuit breaker terminal in advance;
the temperature acquisition module is used for acquiring an actual temperature value of the low-voltage circuit breaker terminal;
the current acquisition module is used for acquiring the actual current value of the low-voltage circuit breaker terminal;
the control module is also used for calculating an actual temperature rise value of the low-voltage circuit breaker terminal according to the actual temperature value and the actual current value; and the number of the first and second groups,
and the control module is also used for determining the state of the low-voltage circuit breaker terminal according to the actual temperature rise value and the characteristic value.
In another aspect of the present invention, there is provided a low voltage circuit breaker including: at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method recited above; or,
the low-voltage circuit breaker comprises the device described above.
According to the low-voltage circuit breaker and the method and the device for identifying the terminal fault of the low-voltage circuit breaker, whether the terminal of the low-voltage circuit breaker has the fault or not can be identified only by utilizing the terminal temperature and the current of the low-voltage circuit breaker, the environment temperature does not need to be measured, and the economic cost can be saved.
Drawings
Fig. 1 is a schematic flow chart of a method for identifying a terminal fault of a low-voltage circuit breaker according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of determining the state of the terminals of the low-voltage circuit breaker according to another embodiment of the present invention;
fig. 3 is a schematic flow diagram for determining the state of the terminals of the low-voltage circuit breaker according to another embodiment of the invention;
fig. 4 is a schematic flow chart of another embodiment of the present invention for determining the state of the terminals of the low-voltage circuit breaker;
fig. 5 is a schematic structural diagram of a device for identifying a terminal fault of a low-voltage circuit breaker according to another embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention is further described in detail with reference to the accompanying drawings and the detailed description below.
As shown in fig. 1, a method for identifying a terminal fault of a low-voltage circuit breaker, the method comprising:
and S110, calculating a characteristic value for representing the contact resistance according to the temperature value and the current value of the low-voltage circuit breaker terminal in advance.
Specifically, in this step, each temperature value and each current value of each terminal of the low-voltage circuit breaker are measured in advance, and a characteristic value for representing the contact resistance is calculated according to each measured temperature value and each measured current value. It should be noted that, each temperature value and each current value for calculating the characteristic value of the contact resistance may be obtained under different measurement conditions, for example, each temperature value and each current value are obtained by measurement under standard experimental conditions, each temperature value and each current value are obtained by measurement under an operating environment of the circuit breaker, and the like, which is not limited in this embodiment.
Further, the calculation method of the characteristic value based on the temperature value and the current value is also different depending on the type of the characteristic value. The characteristic value may be, for example, a standard relative temperature rise value, a standard temperature rise value, or a temperature deviation threshold, and the like, which is not limited in this embodiment.
S210, obtaining an actual temperature value and an actual current value of the low-voltage circuit breaker terminal, and calculating to obtain an actual temperature rise value of the low-voltage circuit breaker terminal according to the actual temperature value and the actual current value.
Specifically, in this step, an actual temperature value and an actual current value of a normally operating low-voltage circuit breaker terminal are obtained, and an actual temperature rise value of the low-voltage circuit breaker terminal is calculated according to the actual temperature value and the actual current value. It is understood that when different types of characteristic values representing the contact resistance are adopted, the actual temperature rise value is obtained from the actual temperature value and the actual current value in different manners.
And S310, determining the state of the low-voltage circuit breaker terminal according to the actual temperature rise value and the characteristic value.
Specifically, in this step, the obtained actual temperature rise value is compared with the characteristic value. The sizes of the two numerical values are distinguished through comparison, and the state of the low-voltage circuit breaker terminal is judged according to the difference of the numerical values.
According to the method for identifying the fault of the low-voltage circuit breaker terminal, whether the terminal of the low-voltage circuit breaker has the fault or not can be identified only by utilizing the terminal temperature and the current of the low-voltage circuit breaker, the environmental temperature does not need to be measured, and the economic cost can be saved.
Exemplarily, as shown in fig. 2, as a first specific example, the determining the state of the low-voltage circuit breaker terminal according to the actual temperature rise value and the characteristic value, where the characteristic value is a standard relative temperature rise value, includes:
and S320a, calculating to obtain a standard relative temperature rise reduced value according to the actual current value and the standard relative temperature rise value.
Specifically, in this step, the standard relative temperature rise value can be obtained as follows:
and acquiring sampling temperature values corresponding to the sampling current values at preset step lengths based on the rated current of the low-voltage circuit breaker. And respectively calculating the standard relative temperature rise value under the change of each two adjacent sampling current values based on the sampling temperature value corresponding to each sampling current value.
As an example, the standard relative temperature rise value is calculated as follows: setting the rated current of the circuit breaker to be 2000A, taking 10A as a preset step length, respectively measuring the terminal temperature at 10A, 20A and 30A … A, and then calculating the standard relative temperature rise value under the adjacent current change:
the standard relative temperature rise values obtained from the above are:
wherein
is a sampling temperature value corresponding to the next sampling flow value under the preset step length,
is the sampling temperature value corresponding to the previous sampling flow value under the preset step length.
And after the standard relative temperature rise value is obtained, calculating to obtain a standard relative temperature rise conversion value according to the actual current value and the standard relative temperature rise value.
As an example, the standard relative temperature rise reduced value is calculated as follows:
wherein
，
。 
the flow rate value of the next sampling under the preset step length,
is the flow value of the previous sampling under the preset step length.
Is the actual current value at the time of the next actual measurement,
is the actual current value at the previous actual measurement.
For example, the rated current of the breaker is set to 2000A, the terminal current rises from 20A to 25A, and the standard relative temperature rise conversion value is as follows:
。
the rated current of the breaker is set to 2000A, the actual temperature of the terminal rises from 30 ℃ to 32 ℃ during the actual current rising from 1900A to 1965A measured during the operation process. The standard relative temperature rise values of the pre-measured current of the low-voltage breaker terminal in the process of rising from 1900A to 1970A every interval of 10A are respectively as follows:
it should be noted that, the actual temperature rise value is calculated by the following method:
wherein
is an actual temperature value at the time of the next actual measurement,
is the actual temperature value at the previous actual measurement.
S321a, if the actual temperature rise value is larger than the standard relative temperature rise conversion value, judging that the low-voltage circuit breaker terminal has a fault.
In particular, in this step, if as mentioned above
A value greater than
And if the value is less than the preset value, judging that the low-voltage breaker terminal has a fault.
And S322a, if the actual temperature rise value is smaller than the standard relative temperature rise conversion value, judging that the low-voltage circuit breaker terminal is normal.
In particular, in this step, if it is as described above
A value of less than
And if the value is less than the preset value, judging that the low-voltage breaker terminal is normal.
As an example, as described above, since the terminal temperature rises from 30 ℃ to 32 ℃ in the course of the actual current rising from 1900A to 1965A, 2 ℃ to 0.75 ℃ rises, and thus it can be determined that the low-voltage circuit breaker terminal is in poor contact.
The method for identifying the terminal fault of the low-voltage circuit breaker in the embodiment of the invention comprises the steps of comparing
And
the size relation between the two can judge whether the low-voltage circuit breaker terminal has a fault or not, and an environment temperature sensor is not required to be installed.
Illustratively, as shown in fig. 3, as a second specific example, the characteristic value is a standard temperature rise value of the terminal measured in advance at different current values, respectively. The calculating the actual temperature rise value of the low-voltage circuit breaker terminal according to the actual temperature value and the actual current value comprises the following steps:
s211, inputting the actual temperature value and the actual current value into a temperature rise prediction model trained in advance, and predicting to obtain the actual temperature rise value. The temperature rise prediction model is used for representing the corresponding relation among the terminal temperature, the current and a temperature rise value, and the temperature rise value is the difference value between the terminal temperature and the environment temperature.
Specifically, in this step, the actual temperature value and the actual current value during actual measurement may be input to a temperature rise prediction model trained in advance, so as to obtain a predicted actual temperature rise value. The predicted actual temperature rise value is the difference between the terminal temperature and the ambient temperature.
And measuring standard temperature rise values of the terminal under different current values in advance, wherein the obtained standard temperature rise values can be used as characteristic values.
Preferably, the temperature rise prediction model is trained in the following specific process:
and acquiring a training data set of the low-voltage circuit breaker terminal, wherein the training data set comprises a temperature value, a current value and a temperature rise value of the terminal. And training the temperature rise prediction model by taking the temperature value and the current value of the terminal as input and the temperature rise value as output to obtain the trained temperature rise prediction model.
Specifically, each temperature value, current value and temperature rise value of the low-voltage circuit breaker terminal during operation are obtained in advance, an LSTM deep learning network is established according to the obtained temperature values, current values and temperature rise values, the input of the LSTM deep learning network is each temperature value and current value of the terminal, and the output of the LSTM deep learning network is each temperature rise value. And training the LSTM deep learning network by using a large amount of training data sets, and exporting the trained network as a temperature rise prediction model to obtain the trained temperature rise prediction model.
Determining the state of the low-voltage circuit breaker terminal according to the actual temperature rise value and the characteristic value comprises the following steps:
s321b, if the actual temperature rise value is larger than the standard temperature rise value, judging that the low-voltage circuit breaker terminal has a fault.
Specifically, in this step, if the actual temperature rise value is greater than the standard temperature rise value, it may be determined that a fault exists at the low-voltage circuit breaker terminal.
As an example, the actual current 1600A of the terminal of the low-voltage circuit breaker is set, the actual temperature is 35 ℃, and the actual current value and the actual temperature value are input into the temperature rise prediction model to obtain the actual temperature rise value of 10 ℃. The standard temperature rise was previously determined to be 5 ℃ at a current of 1600A. Because the actual temperature rise value of 10 ℃ is greater than the standard temperature rise value of 5 ℃, the poor contact of the low-voltage circuit breaker terminal can be judged.
And S322b, if the actual temperature rise value is smaller than the standard temperature rise value, judging that the low-voltage circuit breaker terminal is normal.
Specifically, in this step, if the actual temperature rise value is smaller than the standard temperature rise value, it may be determined that the low-voltage circuit breaker terminal is normal.
According to the method for identifying the fault of the low-voltage circuit breaker terminal, whether the low-voltage circuit breaker terminal is in poor contact or not can be judged by comparing the magnitude relation between the actual temperature rise value and the standard temperature rise value, the existing circuit breaker environment can not be modified, and therefore economic cost is saved.
Illustratively, as a third specific example, as shown in fig. 4, the characteristic value is a temperature deviation threshold value, and the actual temperature rise value is an actual temperature maximum deviation value. The calculating the actual temperature rise value of the low-voltage circuit breaker terminal according to the actual temperature value and the actual current value comprises the following steps: and calculating to obtain the actual current maximum deviation value of each phase terminal according to the actual current value of each phase terminal of the low-voltage circuit breaker. And calculating to obtain the actual temperature maximum deviation value of each phase terminal according to each phase terminal temperature value corresponding to each phase actual current value of each phase terminal of the low-voltage circuit breaker. The following description will be made in detail by taking a three-phase terminal as an example.
As an example, the actual current values of the phases of the three-phase terminals obtained by actual detection are respectively
Calculating the maximum deviation value of the actual current as follows:
actual temperature values corresponding to actual current values of all phases of the three-phase terminal are obtained through actual detection
Calculating the maximum deviation value of the actual temperature as follows:
exemplarily, as shown in fig. 4, the determining the state of the low voltage circuit breaker terminal according to the actual temperature rise value and the characteristic value includes:
and S320c, determining a corresponding actual deviation interval based on the actual current maximum deviation value, and determining an actual temperature deviation threshold according to the actual deviation interval.
It should be noted that the calculating, according to the temperature value and the current value of the low-voltage circuit breaker terminal in advance, to obtain a characteristic value for characterizing the contact resistance includes: and acquiring the maximum deviation value of the sampling current in each deviation interval. And calculating the corresponding temperature deviation threshold value in the deviation interval according to the sampling temperature maximum deviation value corresponding to the sampling current maximum deviation value in each deviation interval.
For example, the three-phase terminal temperature value and the current value at each time are measured in advance, and the three-phase terminal current maximum deviation value and the temperature maximum deviation value at each time are calculated from the measured three-phase terminal temperature value and current value at each time. Setting a three-phase current maximum deviation interval into [0,1 ], [1,2 ], [2,3 ]) … and [1999,2000 by taking 1A as an interval value of front closing and back opening, respectively calculating the Mean value (Mean) and the standard of the three-phase temperature maximum deviation value corresponding to the three-phase current maximum deviation value falling in each intervalDifference (Std). The temperature deviation threshold can thus be derived as:
。
s321c, if the actual temperature maximum deviation value is larger than the actual temperature deviation threshold value, judging that the low-voltage circuit breaker terminal has a fault.
Specifically, in this step, if the maximum deviation value of the actual temperature is greater than the actual temperature deviation threshold value, it can be determined that a fault exists at the low-voltage circuit breaker terminal.
And S322c, if the actual temperature maximum deviation value is smaller than the actual temperature deviation threshold value, judging that the low-voltage circuit breaker terminal is normal.
Specifically, in this step, if the maximum deviation value of the actual temperature is smaller than the threshold value of the actual temperature deviation, it may be determined that the low-voltage circuit breaker terminal is normal.
As an example, a low-voltage circuit breaker whose rated current is 2000A was provided, and the actual currents of A, B, C three-phase terminals were measured as 1960a,1975a,1999a, respectively, while the actual temperatures of A, B, C three-phase terminals were measured as 20 ℃,21 ℃,30 ℃, respectively, at a certain time in actual operation. The maximum deviation value of the three-phase actual current obtained by calculation is
The maximum deviation value of the three-phase actual temperature is
. The maximum deviation value of the three-phase actual current is analyzed to fall in the interval of 39,40). The maximum Mean deviation (Mean) of the actual temperatures of the three-phase terminals is 8 ℃, the standard deviation is 1 ℃, and the actual temperature deviation threshold value obtained by calculation is
Because the maximum deviation value of the actual temperature of the three-phase terminal
Is less thanActual temperature deviation threshold
Therefore, the low-voltage circuit breaker three-phase terminal can be judged to be normal without poor contact fault.
According to the method for identifying the low-voltage circuit breaker terminal fault, disclosed by the embodiment of the invention, whether the low-voltage circuit breaker terminal is in poor contact can be judged by comparing the magnitude relation between the actual temperature maximum deviation value and the actual temperature deviation threshold value, and the economic cost can be saved.
Another aspect of the present invention, as shown in fig. 5, provides an apparatus for identifying a terminal fault of a low-voltage circuit breaker, said apparatus comprising: and the control module 1 is used for calculating a characteristic value for representing the contact resistance according to the temperature value and the current value of the low-voltage circuit breaker terminal in advance. And the temperature acquisition module 2 is used for acquiring the actual temperature value of the low-voltage circuit breaker terminal. And the current obtaining module 3 is used for obtaining the actual current value of the low-voltage circuit breaker terminal. And the control module 1 is further configured to calculate an actual temperature rise value of the low-voltage circuit breaker terminal according to the actual temperature value and the actual current value. And the control module is also used for determining the state of the low-voltage circuit breaker terminal according to the actual temperature rise value and the characteristic value.
Specifically, as shown in fig. 5, the apparatus includes a control module 1, a temperature acquisition module 2, and a current acquisition module 3. The temperature acquisition module 2 may acquire an actual temperature of the low-voltage circuit breaker terminal, and the current acquisition module 3 may acquire an actual current of the low-voltage circuit breaker terminal. The temperature acquisition module 2 and the current acquisition module 3 are both connected with the control module 1 to transmit the acquired actual temperature and actual current of the terminal to the control module 1. The control module 1 calculates an actual temperature rise value of the terminal according to the actual temperature and the actual current transmitted to the terminal.
The control module 1 calculates a characteristic value for representing the contact resistance according to the temperature value and the current value of the low-voltage circuit breaker terminal in advance. After obtaining the actual temperature rise value of the terminal and the characteristic value used for representing the contact resistance, the control module 1 compares the actual temperature rise value of the terminal and the characteristic value, and if the actual temperature rise value is larger than the characteristic value, the terminal fault of the low-voltage circuit breaker can be determined.
Preferably, the identification means may further comprise an alarm member, which is connected to the control module 1. After the identification device determines that the low-voltage circuit breaker terminal has a fault, the control module 1 sends a fault signal to the alarm part, and the alarm part sends prompt alarm information after receiving the fault signal. Through setting up the warning piece, can confirm low voltage circuit breaker terminal trouble more directly perceivedly.
According to the low-voltage circuit breaker terminal fault identification device, the control module, the temperature acquisition module and the current acquisition module are arranged, so that whether the low-voltage circuit breaker terminal is in fault can be judged without installing an environment temperature sensor, and meanwhile, the economic cost is saved.
In another aspect of the present invention, there is provided a low voltage circuit breaker including: at least one processor. And a memory communicatively coupled to the at least one processor. Wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method recited above. The specific steps of the method can refer to the related descriptions, and are not described herein again. Alternatively, the low-voltage circuit breaker comprises the device described above. The specific structure of the device can refer to the related descriptions, and is not described herein again.
According to the low-voltage circuit breaker provided by the embodiment of the invention, whether the terminal of the low-voltage circuit breaker breaks down or not can be identified only by utilizing the terminal temperature and the current of the low-voltage circuit breaker, the environmental temperature does not need to be measured, and the economic cost can be saved.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A method for identifying a fault at a terminal of a low-voltage circuit breaker, characterized in that it comprises:
calculating a characteristic value for representing contact resistance according to the temperature value and the current value of the low-voltage circuit breaker terminal in advance;
acquiring an actual temperature value and an actual current value of the low-voltage circuit breaker terminal, and calculating to obtain an actual temperature rise value of the low-voltage circuit breaker terminal according to the actual temperature value and the actual current value;
and determining the state of the low-voltage circuit breaker terminal according to the actual temperature rise value and the characteristic value.
2. The method according to claim 1, characterized in that said characteristic value is a standard relative temperature rise value, said determining the state of the low-voltage circuit breaker terminals according to said actual temperature rise value and said characteristic value comprising:
calculating to obtain a standard relative temperature rise conversion value according to the actual current value and the standard relative temperature rise value;
if the actual temperature rise value is larger than the standard relative temperature rise conversion value, judging that the low-voltage circuit breaker terminal has a fault; and the number of the first and second groups,
and if the actual temperature rise value is smaller than the standard relative temperature rise conversion value, judging that the low-voltage circuit breaker terminal is normal.
3. The method according to claim 2, characterized in that said calculating in advance, from the temperature values and the current values of the low voltage circuit breaker terminals, characteristic values for characterizing the contact resistance comprises:
acquiring sampling temperature values corresponding to sampling current values at preset step lengths based on the rated current of the low-voltage circuit breaker;
and respectively calculating the standard relative temperature rise value under the change of each two adjacent sampling current values based on the sampling temperature value corresponding to each sampling current value.
4. The method according to claim 1, wherein the characteristic value is a standard temperature rise value of the terminal measured in advance at different current values respectively;
the calculating the actual temperature rise value of the low-voltage circuit breaker terminal according to the actual temperature value and the actual current value comprises the following steps:
inputting the actual temperature value and the actual current value into a pre-trained temperature rise prediction model, and predicting to obtain the actual temperature rise value; the temperature rise prediction model is used for representing the corresponding relation among the terminal temperature, the current and a temperature rise value, and the temperature rise value is the difference value between the terminal temperature and the environment temperature;
determining the state of the low-voltage circuit breaker terminal according to the actual temperature rise value and the characteristic value comprises the following steps:
if the actual temperature rise value is larger than the standard temperature rise value, judging that a fault exists at the low-voltage circuit breaker terminal; and the number of the first and second groups,
and if the actual temperature rise value is smaller than the standard temperature rise value, judging that the low-voltage circuit breaker terminal is normal.
5. The method according to claim 4, wherein the temperature rise prediction model is trained as follows:
acquiring a training data set of the low-voltage circuit breaker terminal, wherein the training data set comprises a temperature value, a current value and a temperature rise value of the terminal;
and training the temperature rise prediction model by taking the temperature value and the current value of the terminal as input and the temperature rise value as output to obtain the trained temperature rise prediction model.
6. The method of claim 1, wherein the characteristic value is a temperature deviation threshold value and the actual temperature rise value is an actual temperature maximum deviation value; the calculating the actual temperature rise value of the low-voltage circuit breaker terminal according to the actual temperature value and the actual current value comprises the following steps:
calculating to obtain the actual current maximum deviation value of each phase terminal according to the actual current value of each phase terminal of the low-voltage circuit breaker;
and calculating to obtain the actual temperature maximum deviation value of each phase terminal according to each phase terminal temperature value corresponding to each phase actual current value of each phase terminal of the low-voltage circuit breaker.
7. The method according to claim 6, characterized in that said determining the state of the low voltage circuit breaker terminals according to said actual temperature rise value and said characteristic value comprises:
determining a corresponding actual deviation interval based on the actual current maximum deviation value, and determining an actual temperature deviation threshold according to the actual deviation interval;
if the actual temperature maximum deviation value is larger than the actual temperature deviation threshold value, judging that a fault exists at the low-voltage circuit breaker terminal; and the number of the first and second groups,
and if the actual temperature maximum deviation value is smaller than the actual temperature deviation threshold value, judging that the low-voltage circuit breaker terminal is normal.
8. The method according to claim 7, characterized in that said calculating in advance, from the temperature values and the current values of the low voltage circuit breaker terminals, characteristic values for characterizing the contact resistance comprises:
acquiring the maximum deviation value of the sampling current in each deviation interval;
and calculating the corresponding temperature deviation threshold value in the deviation interval according to the sampling temperature maximum deviation value corresponding to the sampling current maximum deviation value in each deviation interval.
9. An apparatus for identifying a fault at a terminal of a low-voltage circuit breaker, characterized in that it comprises:
the control module is used for calculating a characteristic value for representing the contact resistance according to the temperature value and the current value of the low-voltage circuit breaker terminal in advance;
the temperature acquisition module is used for acquiring the actual temperature value of the low-voltage circuit breaker terminal;
the current acquisition module is used for acquiring the actual current value of the low-voltage circuit breaker terminal;
the control module is further used for calculating an actual temperature rise value of the low-voltage circuit breaker terminal according to the actual temperature value and the actual current value; and the number of the first and second groups,
and the control module is also used for determining the state of the low-voltage circuit breaker terminal according to the actual temperature rise value and the characteristic value.
10. A low-voltage circuit breaker, characterized in that it comprises:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1 to 8; or,
the low-voltage circuit breaker comprising the device of claim 9.
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