CN113203945B - Circuit breaker energy storage loop fault judgment method and fault recorder - Google Patents
Circuit breaker energy storage loop fault judgment method and fault recorder Download PDFInfo
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- CN113203945B CN113203945B CN202110451680.9A CN202110451680A CN113203945B CN 113203945 B CN113203945 B CN 113203945B CN 202110451680 A CN202110451680 A CN 202110451680A CN 113203945 B CN113203945 B CN 113203945B
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- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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Abstract
The invention provides a fault judgment method for a circuit breaker energy storage loop, which comprises the steps of acquiring and detecting energy storage current of the circuit breaker energy storage loop during each energy storage work; if the fact that the energy storage current of the energy storage circuit of the circuit breaker gradually increases along with the increase of the energy storage times is detected, and the circuit breaker energy storage circuit is determined to have a short-circuit fault when the energy storage current during certain energy storage work is higher than a preset current upper limit value; and if the fact that the energy storage current of the energy storage loop of the circuit breaker is gradually reduced along with the increase of the energy storage times is detected, and the circuit breaker energy storage loop is determined to have a circuit breaking fault when the energy storage current during certain energy storage work is lower than a preset current lower limit value. The invention also provides a fault recorder. The method is simple and practical, can quickly judge the specific condition of the fault of the energy storage circuit, and can also predict the development trend of the fault of the energy storage circuit.
Description
Technical Field
The invention relates to the technical field of circuit breaker detection, in particular to a fault judgment method for a circuit breaker energy storage loop and a fault recorder.
Background
The circuit breaker energy storage loop generally comprises an energy storage motor power supply, a control contact, a voltage division current limiting resistor, an energy storage motor and the like, and is a loop for supplying power to the energy storage motor of the circuit breaker. The energy storage process of the circuit is started by the conduction of the low energy storage pressure contact of the circuit breaker and ended by the disconnection of the low energy storage pressure contact.
No matter the energy storage motor is in fault or components in an energy storage loop often break down when running for a certain period, the energy storage mechanism of the circuit breaker cannot work normally, so that the circuit breaker loses the function of opening and closing operation, and even the circuit breaker fails to operate due to short circuit of power equipment. Therefore, it is necessary to effectively judge the fault of the energy storage circuit of the circuit breaker so as to ensure the reliability of power supply.
However, the existing method for judging the fault of the energy storage circuit of the circuit breaker is too complex, so that the specific situation of the fault of the energy storage circuit cannot be quickly judged, and the development trend of the fault of the energy storage circuit cannot be predicted.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a method for judging a fault of an energy storage circuit of a circuit breaker and a fault recorder, which are simple and practical, and can not only quickly judge the specific situation of the fault of the energy storage circuit, but also predict the development trend of the fault of the energy storage circuit.
In order to solve the technical problem, an embodiment of the present invention provides a method for determining a fault of an energy storage circuit of a circuit breaker, where the method includes the following steps:
acquiring and detecting the energy storage current of the circuit breaker energy storage loop during each energy storage work;
if the fact that the energy storage current of the energy storage circuit of the circuit breaker gradually increases along with the increase of the energy storage times is detected, and the circuit breaker energy storage circuit is determined to have a short-circuit fault when the energy storage current during certain energy storage work is higher than a preset current upper limit value;
and if the fact that the energy storage current of the energy storage loop of the circuit breaker is gradually reduced along with the increase of the energy storage times is detected, and the circuit breaker energy storage loop is determined to have a circuit breaking fault when the energy storage current during certain energy storage work is lower than a preset current lower limit value.
Wherein the method further comprises:
when the circuit breaker energy storage loop is determined to have the short-circuit fault, counting all energy storage currents lower than the current upper limit value on the circuit breaker energy storage loop and corresponding energy storage operation starting time and energy storage operation ending time, and calculating theoretical short-circuit fault occurrence time when the energy storage currents are higher than the current upper limit value according to all the counted energy storage currents lower than the current upper limit value and corresponding energy storage operation starting time and energy storage operation ending time.
Wherein, by the formula
Calculating the theoretical short-circuit fault occurrence time t when the energy storage current is higher than the current upper limit value n～f (ii) a Wherein the content of the first and second substances,
I f the current is the upper limit value; n is all lower than the current upper limit value I f Total number of stored energy of, and n>3；I 1 ～I n Energy storage currents corresponding to the circuit breaker energy storage loop in sequence from the first time to the nth time during energy storage work and all lower than the current upper limit value I f ；t 1～2 ～t n-1～n The interval time of the circuit breaker energy storage loop in two adjacent energy storage operations is obtained according to the end time of the previous energy storage operation and the starting time of the next energy storage operation of the two adjacent energy storage operations.
Wherein the method further comprises:
and obtaining the time difference that the actual time for detecting and determining the short-circuit fault of the energy storage circuit of the circuit breaker lags behind the calculated theoretical short-circuit fault occurrence time according to the calculated theoretical short-circuit fault occurrence time and the actual time for detecting and determining the short-circuit fault of the energy storage circuit of the circuit breaker.
Wherein the method further comprises:
when the circuit breaker energy storage loop is determined to have the open-circuit fault, counting all energy storage currents higher than the current lower limit value on the circuit breaker energy storage loop and corresponding energy storage operation starting time and energy storage operation ending time, and calculating theoretical open-circuit fault occurrence time when the energy storage currents are lower than the current lower limit value according to all the counted energy storage currents higher than the current lower limit value and corresponding energy storage operation starting time and energy storage operation ending time.
Wherein, by the formula
Calculating the theoretical open circuit fault occurrence time t when the energy storage current is lower than the current lower limit value m～low (ii) a Wherein the content of the first and second substances,
I low is the current lower limit value; m is all above the current lower limit value I low Total number of stored energy of, and n>3；I 1 ～I m Energy storage currents corresponding to the circuit breaker energy storage loop in sequence from the first time to the mth time of energy storage work and higher than the current lower limit value I low ；t 1-2 ～t m-1～m The interval time of two adjacent energy storage operations of the energy storage loop of the circuit breaker is obtained according to the ending time of the previous energy storage operation and the starting time of the next energy storage operation of the two adjacent energy storage operations.
Wherein the method further comprises:
and obtaining the time difference that the actual time for detecting and determining the open-circuit fault of the energy storage circuit of the circuit breaker lags behind the calculated theoretical open-circuit fault occurrence time according to the calculated theoretical open-circuit fault occurrence time and the actual time for detecting and determining the open-circuit fault of the energy storage circuit of the circuit breaker.
An embodiment of the present invention further provides a fault recorder, including:
the current acquisition and detection unit is used for acquiring and detecting the energy storage current of the circuit breaker energy storage loop during each energy storage operation;
the short-circuit fault judging unit is used for determining that the short-circuit fault occurs in the energy storage loop of the circuit breaker if the fact that the energy storage current of the energy storage loop of the circuit breaker is gradually increased along with the increase of the energy storage times is detected until the energy storage current during certain energy storage work is higher than a preset current upper limit value;
and the open circuit fault judgment unit is used for determining that the open circuit fault occurs in the circuit breaker energy storage loop if the stored energy current of the circuit breaker energy storage loop is detected to be gradually reduced along with the increase of the energy storage times until the stored energy current in certain energy storage working is lower than a preset current lower limit value.
Wherein, still include: a short-circuit fault theoretical time tracing unit; wherein the content of the first and second substances,
and the short-circuit fault theoretical time tracing unit is used for counting all the energy storage currents lower than the current upper limit value and the energy storage operation starting time and the energy storage operation ending time corresponding to the energy storage currents respectively on the circuit breaker energy storage circuit when the circuit breaker energy storage circuit is determined to have a short-circuit fault, and calculating the theoretical short-circuit fault occurrence time when the energy storage currents are higher than the current upper limit value according to all the counted energy storage currents lower than the current upper limit value and the energy storage operation starting time and the energy storage operation ending time corresponding to the energy storage currents respectively.
Wherein, still include: a theoretical time tracing unit of open circuit fault; wherein the content of the first and second substances,
and the circuit breaking fault theoretical time tracing unit is used for counting all the energy storage currents higher than the current lower limit value on the circuit breaker energy storage loop and the corresponding energy storage operation starting time and energy storage operation ending time when the circuit breaker energy storage loop is judged to have a circuit breaking fault, and calculating the theoretical circuit breaking fault occurrence time when the energy storage currents are lower than the current lower limit value according to all the counted energy storage currents higher than the current lower limit value and the corresponding energy storage operation starting time and energy storage operation ending time.
The embodiment of the invention has the following beneficial effects:
1. according to the invention, based on the comparison of the change rule and the current threshold (such as the current upper limit value and the current lower limit value) generated by the energy storage current of the circuit breaker energy storage loop along with the increase of the energy storage times each time, whether the circuit breaker energy storage loop has a fault and the type of the fault (such as a short-circuit fault and a broken fault) can be quickly judged, the method is simple and practical, and the purpose of quickly judging the specific condition of the energy storage loop fault is achieved;
2. according to the method, the theoretical fault occurrence time of different fault types can be rapidly predicted based on all the energy storage currents which do not reach the current threshold (such as being higher than the current lower limit value or lower than the current upper limit value) on the energy storage circuit of the circuit breaker and the energy storage operation starting time and the energy storage operation ending time which correspond to the energy storage currents, and the time difference that the actual time lags behind the theoretical time is obtained, so that the development trend of the fault of the energy storage circuit can be accurately predicted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a fault recorder according to an embodiment of the present invention;
fig. 2 is a working schematic diagram of a fault recorder access circuit breaker energy storage circuit according to an embodiment of the present invention;
fig. 3 is a waveform diagram of energy storage current when a short-circuit fault of an energy storage circuit of a circuit breaker occurs and under all previous detection records in an application scenario of a fault recorder according to an embodiment of the present invention;
FIG. 4 is a graph illustrating the trend of the energy storage current in FIG. 3;
fig. 5 is a waveform diagram of the energy storage current when the open fault of the energy storage circuit of the circuit breaker occurs and under all the previous detection records in the application scenario of the fault recorder according to the embodiment of the present invention;
FIG. 6 is a graph illustrating the trend of the energy storage current in FIG. 5;
fig. 7 is a flowchart of a method for determining a fault of an energy storage circuit of a circuit breaker according to an embodiment of 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 further detail with reference to the accompanying drawings.
The inventor finds that the current flowing in the energy storage circuit of the circuit breaker is different when the circuit breaker is in fault and the current is different when the energy storage motor is in aging fault and short-circuit fault (for example, the former shows that the current is reduced, and the latter shows that the current is increased), so that the electric quantity such as the current, the voltage, the energy storage contact and the like when the circuit breaker is in operation can be monitored by a fault recorder, and the operation condition of the circuit breaker energy storage circuit, such as short-circuit fault and open-circuit fault, can be obtained by analysis.
In this case, the short-circuit fault is a fault in which a current of a power supply of a circuit breaker tank circuit is abruptly increased due to the presence of a short-circuit point in the circuit. If the circuit breaker energy storage motor runs for a long time, the internal winding of the motor is damaged due to insulation aging, and turn-to-turn short circuit is caused; in another example, due to aging of the pattern layer of the housing, insulation reduction occurs, which causes discharge to the ground by the winding, and forms a ground short circuit.
The open circuit fault refers to the fault that the energy storage contact of the energy storage loop of the circuit breaker is disconnected, insulation damage occurs due to aging of a voltage division current limiting resistor, the resistance is increased or the circuit is opened. For example, in the design of the matching degree of the energy storage loop elements, the problem of aging and increasing resistance of the motor winding is often ignored, so that excessive resistance is connected in the design of the energy storage loop; for another example, when the energy storage motor and the energy storage loop contactor operate for a long time, the overall impedance of the energy storage loop is increased, so that the energy storage motor cannot be started to operate, and the circuit breaker operating mechanism loses the energy storage function; if the contactor of the motor runs for a long time, the contact surface of the internal contact is oxidized for a long time to generate rust, when the contactor is switched on for excitation, the contact cannot be completely closed, so that the loop of the energy storage motor cannot be electrified, and if the energy storage motor runs, the vibration kinetic energy generated by the rotation of the motor is transmitted to the control box, so that the motor contactor and the adapter terminal screw in the control box are loosened, and the contact of the loop connection point is poor.
The main characteristic of the short-circuit fault based on the circuit breaker energy storage circuit is that the current suddenly changes and increases, the inventor further analyzes the characteristics that the circuit insulation is gradually damaged to cause the impedance to decrease and the capacitance current to increase according to the development of the short-circuit fault, and the energy storage current of the circuit breaker energy storage circuit can gradually increase along with the increase of the frequency of energy storage operation, but the current suddenly changes when the current reaches the preset current upper limit value.
Meanwhile, the main characteristic of the circuit breaking fault based on the circuit breaker energy storage loop is that the current is gradually reduced until the circuit is completely broken, the inventor further analyzes the characteristics that the resistance is increased due to the oxidation of loop components and parts and the reduction of the capacitance current according to the development of the circuit breaking fault, and the energy storage current of the circuit breaker energy storage loop can be gradually reduced along with the increase of the frequency of energy storage work, but the current can rapidly drop when the current reaches the lower limit value of the preset current.
Therefore, based on the analysis result, the inventor proposes that the fault recorder circuit breaker is connected into the circuit breaker energy storage circuit, and the electric quantities such as current, voltage and the like during the operation of the circuit breaker energy storage circuit are analyzed, so that the short-circuit fault and the open-circuit fault occurring in the circuit breaker energy storage circuit are judged.
As shown in fig. 1, which is a fault recorder provided in an embodiment of the present invention, the fault recorder is connected to a circuit breaker tank (as shown in fig. 2) to be able to determine a fault of the circuit breaker tank. In fig. 2, + KM represents the positive pole of the dc power supply of the energy storage loop of the circuit breaker, -KM represents the negative pole of the dc power supply of the energy storage loop of the circuit breaker, ikm + represents the positive pole side of the fault recorder connected to the energy storage loop of the circuit breaker, ikm-represents the negative pole side of the fault recorder connected to the energy storage loop of the circuit breaker, HA represents the closing button, TA represents the opening button, HQ represents the closing dc contactor coil, and TQ represents the opening dc contactor coil.
The fault recorder specifically comprises:
the current obtaining and detecting unit 110 is configured to obtain and detect an energy storage current of the circuit breaker energy storage circuit during each energy storage operation;
the short-circuit fault judging unit 120 is configured to determine that a short-circuit fault occurs in the breaker energy storage circuit if it is detected that the energy storage current of the breaker energy storage circuit gradually increases with the increase of the energy storage times until the energy storage current during a certain energy storage operation is higher than a preset current upper limit value;
and the open-circuit fault judging unit 130 is configured to determine that an open-circuit fault occurs in the breaker energy storage circuit if it is detected that the energy storage current of the breaker energy storage circuit gradually decreases along with the increase of the energy storage frequency until the energy storage current during a certain energy storage operation is lower than a preset current lower limit value.
In an embodiment of the present invention, the fault recorder further includes: a short-circuit fault theoretical time tracing unit; the short-circuit fault theoretical time tracing unit is used for counting all energy storage currents lower than the current upper limit value and energy storage operation starting time and energy storage operation ending time corresponding to the energy storage currents on the breaker energy storage loop when the breaker energy storage loop is determined to have a short-circuit fault, and calculating the theoretical short-circuit fault occurrence time when the energy storage currents are higher than the current upper limit value according to all the counted energy storage currents lower than the current upper limit value and the energy storage operation starting time and the energy storage operation ending time corresponding to the energy storage currents.
For example, by the formula (1), the theoretical short-circuit fault occurrence time t when the energy storage current is higher than the current upper limit value is calculated n～f ；
Wherein, I f Is the current upper limit value; n is all values lower than the current upper limit value I f Total number of stored energy of, and n>3；I 1 ～I n The energy storage currents corresponding to the circuit breaker energy storage loop in sequence from the first time to the nth time during energy storage work are all lower than a current upper limit value I f ；t 1～2 ～t n-1～n The interval time of two adjacent energy storage operations of the energy storage loop of the circuit breaker is obtained according to the ending time of the previous energy storage operation and the starting time of the next energy storage operation of the two adjacent energy storage operations, namelyThe time from one energy storage operation to the next energy storage operation before the two adjacent energy storage operations.
In one embodiment, as shown in FIG. 3, I 1 ～I 3 The energy-storage current waveforms of the first, second and third times since recording, I f Short-circuit fault current waveform (namely current upper limit value) t under energy storage loop theory 01 For the initial time of energy storage operation, t 02 The energy storage operation end time.
According to the characteristics of the short-circuit fault, the impedance is reduced due to the gradual damage of the loop insulation, the capacitance current is increased, the development of the actual current waveform is gradually increased through analysis, and therefore the actual current waveform can be calculated from I 1 Development to I 2 Time t of 1～2 I.e. the interval between the end time of the first energy-storing operation and the start time of the second energy-storing operation, I 2 Development to I 3 Time t of 2～3 Namely the interval time between the ending time of the second energy storage operation and the starting time of the third energy storage operation, and then the energy is stored by a formula
By performing a weighted calculation, the progression to I can be predicted f Time t of 3～f I.e. the stored energy current is higher than the upper current limit value I f The theoretical short-circuit fault occurrence time of (2) is shown in fig. 4.
In the embodiment of the invention, the occurrence time t of the theoretical short-circuit fault can be calculated according to the calculated theoretical short-circuit fault n～f And detecting and determining the actual time of the short-circuit fault of the energy storage circuit of the circuit breaker, and obtaining the time difference that the actual time of the short-circuit fault of the energy storage circuit of the circuit breaker lags behind the calculated theoretical short-circuit fault occurrence time.
In one embodiment, taking fig. 3 and 4 as an example, we have evolved to I f Time t of 3～f And as can be seen from fig. 4, the fault recorder will detect that the stored energy current is higher than the current upper limit value I during the fourth storage operation f If the breaker energy storage loop is determined to have short circuit fault during the fourth energy storage operation, the fault record can be directly obtainedThe actual time of the fourth energy storage operation of the wave filter is assumed as t K 。
Calculating the time difference t = t when the actual time of the short-circuit fault of the energy storage circuit of the circuit breaker lags behind the theoretical short-circuit fault occurrence time K -t 3～f This allows for the traceability that the short circuit fault occurs in the circuit breaker tank circuit before the fourth detection and the duration of the short circuit fault that existed before the occurrence of the short circuit fault was detected.
In an embodiment of the present invention, the fault recorder further includes: a theoretical time tracing unit of open circuit fault; the circuit-breaking fault theoretical time tracing unit is used for counting all the energy storage currents higher than the lower current limit value on the circuit breaker energy storage loop and the corresponding energy storage operation starting time and energy storage operation ending time when the circuit breaker energy storage loop is determined to have a circuit-breaking fault, and calculating the theoretical circuit-breaking fault occurrence time when the energy storage currents are lower than the lower current limit value according to all the counted energy storage currents higher than the lower current limit value and the corresponding energy storage operation starting time and energy storage operation ending time.
For example, by the formula (2), the theoretical open-circuit fault occurrence time t when the energy storage current is lower than the current lower limit value is calculated m～low ；
Wherein, I low Is the current lower limit value; m is all above the lower current limit value I low Total number of stored energy of, and n>3；I 1 ～I m The energy storage currents corresponding to the circuit breaker energy storage loop in sequence from the first time to the mth time of energy storage work are all higher than the lower limit value I of the current low ；t 1-2 ～t m-1～m The interval time of the circuit breaker energy storage loop in two adjacent energy storage operations is obtained according to the end time of the previous energy storage operation and the starting time of the next energy storage operation of the two adjacent energy storage operations.
In one embodiment, as shown in figure 5,I 1 ～I 3 the energy storage current waveforms of the first time, the second time and the third time since recording, I low Open-circuit fault current waveform (namely current upper limit value) t under energy storage loop theory 01 For the initial time of energy storage operation, t 02 The energy storage operation end time.
According to the characteristics of the open circuit fault, the resistance increase caused by the oxidation of the loop element and the reduction of the capacitance current, the development of the actual current waveform is gradually reduced by analysis, so that the actual current waveform can be calculated from I 1 Development to I 2 Time t of 1～2 I.e. the interval between the end time of the first energy-storing operation and the start time of the second energy-storing operation, I 2 Development to I 3 Time t of 2～3 I.e. the interval time between the end time of the second energy storage operation and the initial time of the third energy storage operation, and then is calculated by a formula
By performing a weighted calculation, the progression to I can be predicted low Time t of 3～low I.e. the stored energy current is below the current lower limit value I low The theoretical open-circuit fault occurrence time of (2) is shown in fig. 6.
In the embodiment of the invention, the time difference that the actual time for detecting and determining the open-circuit fault of the energy storage circuit of the circuit breaker lags behind the calculated theoretical open-circuit fault occurrence time can be obtained according to the calculated theoretical open-circuit fault occurrence time and the actual time for detecting and determining the open-circuit fault of the energy storage circuit of the circuit breaker.
In one embodiment, exemplified by FIGS. 5 and 6, we have evolved to I low Time t of 3～low And it can be known from fig. 5 that the fault recorder will detect that the energy storage current is lower than the current lower limit value I during the fourth energy storage operation low If the breaker energy storage loop has a broken fault during the fourth energy storage operation, the actual time of the fourth energy storage operation of the fault recorder can be directly obtained, and the assumed actual time is t J 。
Calculate the fault of the circuit breaker energy storage circuitTime difference t = t when the actual time of the barrier lags behind the time of occurrence of the theoretical short-circuit fault J -t 3～low This allows for a trace back of the time that the circuit breaker tank circuit failed before the fourth test and the time that the fault had been present since it occurred before it was tested.
As shown in fig. 7, in an embodiment of the present invention, a method for determining a fault of a tank circuit of a circuit breaker is provided, where the method includes the following steps:
s1, acquiring and detecting energy storage current of an energy storage loop of the circuit breaker during each energy storage work;
s2, if the fact that the energy storage current of the energy storage loop of the circuit breaker is gradually increased along with the increase of the energy storage times is detected, and the circuit breaker energy storage loop is determined to have a short-circuit fault when the energy storage current during certain energy storage work is higher than a preset current upper limit value;
and S3, if the fact that the energy storage current of the energy storage loop of the circuit breaker is gradually reduced along with the increase of the energy storage times is detected, and the circuit breaker energy storage loop is determined to have a circuit breaking fault when the energy storage current during certain energy storage work is lower than a preset current lower limit value.
In step S1, the fault recorder is connected to the circuit breaker energy storage circuit to obtain the energy storage current of the circuit breaker energy storage circuit during each energy storage operation and detect the energy storage current.
In step S2, according to the characteristics of the short-circuit fault, the impedance is decreased due to the gradual destruction of the loop insulation, and the capacitance current is increased, the actual current waveform is analyzed to be gradually increased, and when it is detected that the energy storage current during a certain (e.g., nth) energy storage operation is higher than the preset current upper limit value, the short-circuit fault occurs in the energy storage loop of the circuit breaker.
In order to trace back whether a short-circuit fault occurs in an energy storage circuit of the circuit breaker before detection and the existing duration time of the short-circuit fault before the short-circuit fault occurs and is detected, the theoretical short-circuit fault occurrence time when the energy storage current is higher than the current upper limit value needs to be calculated according to a preset short-circuit current calculation model. The specific process is as follows:
when the circuit breaker energy storage circuit is determined to have the short-circuit fault, counting all energy storage currents lower than the current upper limit value on the circuit breaker energy storage circuit and energy storage operation starting time and energy storage operation ending time corresponding to the energy storage currents, and calculating theoretical short-circuit fault occurrence time when the energy storage currents are higher than the current upper limit value according to all the counted energy storage currents lower than the current upper limit value and the energy storage operation starting time and the energy storage operation ending time corresponding to the energy storage currents.
For example, by formula
Calculating the theoretical short-circuit fault occurrence time t when the energy storage current is higher than the current upper limit value n～f (ii) a Wherein the content of the first and second substances,
I f is the current upper limit value; n is all lower than the current upper limit value I f Total number of stored energy of, and n>3；I 1 ～I n The energy storage currents corresponding to the circuit breaker energy storage loop in sequence from the first time to the nth time during energy storage work are all lower than the current upper limit value I f ；t 1～2 ～t n-1～n The interval time of the circuit breaker energy storage loop in two adjacent energy storage operations is obtained according to the end time of the previous energy storage operation and the starting time of the next energy storage operation of the two adjacent energy storage operations.
Furthermore, the time difference that the actual time for detecting and identifying the short-circuit fault of the energy storage circuit of the circuit breaker lags behind the calculated theoretical short-circuit fault occurrence time can be obtained according to the calculated theoretical short-circuit fault occurrence time and the actual time for detecting and identifying the short-circuit fault of the energy storage circuit of the circuit breaker.
In step S3, according to the characteristics of the open circuit fault, the resistance increase caused by the oxidation of the circuit component, and the decrease of the capacitance current, the development of the actual current waveform is analyzed to be gradually decreased, and when it is detected that the energy storage current during a certain (e.g., nth) energy storage operation is lower than the preset current lower limit value, the open circuit fault of the circuit breaker energy storage circuit is determined.
In order to trace back whether the circuit breaker energy storage loop has the open circuit fault before detection and the existing duration time of the open circuit fault before the open circuit fault occurs and is detected, the theoretical open circuit fault occurrence time when the energy storage current is lower than the current lower limit value needs to be calculated according to a preset open circuit current calculation model. The specific process is as follows:
when the circuit breaker energy storage loop is determined to have the open-circuit fault, counting all energy storage currents higher than the current lower limit value on the circuit breaker energy storage loop and the corresponding energy storage operation starting time and energy storage operation ending time, and calculating the theoretical open-circuit fault occurrence time when the energy storage currents are lower than the current lower limit value according to all the counted energy storage currents higher than the current lower limit value and the corresponding energy storage operation starting time and energy storage operation ending time.
For example, by formula
Calculating the theoretical open-circuit fault occurrence time t when the energy storage current is lower than the current lower limit value m～low (ii) a Wherein, the first and the second end of the pipe are connected with each other,
I low is the current lower limit value; m is all above the lower current limit value I low Total number of stored energy of, and n>3；I 1 ～I m The energy storage currents corresponding to the circuit breaker energy storage loop in sequence from the first time to the mth time of energy storage work are all higher than the lower limit value I of the current low ；t 1-2 ～t m-1～m The interval time of the circuit breaker energy storage loop in two adjacent energy storage operations is obtained according to the end time of the previous energy storage operation and the starting time of the next energy storage operation of the two adjacent energy storage operations.
Furthermore, the time difference that the actual time for detecting and identifying the open-circuit fault of the energy storage circuit of the circuit breaker lags behind the calculated theoretical open-circuit fault occurrence time can be obtained according to the calculated theoretical open-circuit fault occurrence time and the actual time for detecting and identifying the open-circuit fault of the energy storage circuit of the circuit breaker.
The embodiment of the invention has the following beneficial effects:
1. according to the invention, based on the comparison of the change rule and the current threshold (such as the current upper limit value and the current lower limit value) generated by the energy storage current of the circuit breaker energy storage loop along with the increase of the energy storage times each time, whether the circuit breaker energy storage loop has a fault and the type of the fault (such as a short-circuit fault and a broken fault) can be quickly judged, the method is simple and practical, and the purpose of quickly judging the specific condition of the energy storage loop fault is achieved;
2. according to the method, the theoretical fault occurrence time of different fault types can be rapidly predicted based on all the energy storage currents which do not reach the current threshold (such as being higher than the current lower limit value or lower than the current upper limit value) on the energy storage circuit of the circuit breaker and the energy storage operation starting time and the energy storage operation ending time which correspond to the energy storage currents, and the time difference that the actual time lags behind the theoretical time is obtained, so that the development trend of the fault of the energy storage circuit can be accurately predicted.
It should be noted that, in the above device embodiment, the included device units are only divided according to functional logic, but are not limited to the above division as long as the corresponding functions can be implemented; in addition, the specific names of the functional units are only for the convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (7)
1. A fault judgment method for a circuit breaker energy storage loop is characterized by comprising the following steps:
acquiring and detecting the energy storage current of the circuit breaker energy storage loop during each energy storage work;
if the fact that the energy storage current of the energy storage circuit of the circuit breaker gradually increases along with the increase of the energy storage times is detected, and the circuit breaker energy storage circuit is determined to have a short-circuit fault when the energy storage current during certain energy storage work is higher than a preset current upper limit value;
if the energy storage current of the energy storage loop of the circuit breaker is detected to be gradually reduced along with the increase of the energy storage times until the energy storage current during certain energy storage work is lower than a preset current lower limit value, the circuit breaker energy storage loop is determined to have a broken circuit fault;
wherein the method further comprises:
when the circuit breaker energy storage circuit is determined to have a short-circuit fault, counting all energy storage currents lower than the current upper limit value on the circuit breaker energy storage circuit and energy storage operation starting time and energy storage operation ending time corresponding to the energy storage currents, and calculating theoretical short-circuit fault occurrence time when the energy storage currents are higher than the current upper limit value according to all the counted energy storage currents lower than the current upper limit value and the energy storage operation starting time and the energy storage operation ending time corresponding to the energy storage currents;
wherein, by the formula
Calculating the theoretical short-circuit fault occurrence time t when the energy storage current is higher than the current upper limit value n～f (ii) a Wherein, the first and the second end of the pipe are connected with each other,
I f is the current upper limit value; n is all lower than the current upper limit value I f Total number of stored energy of, and n>3；I 1 ～I n Energy storage currents corresponding to the circuit breaker energy storage loop in sequence from the first time to the nth time during energy storage work and all lower than the current upper limit value I f ；t 1～2 ～t n-1～n The interval time of two adjacent energy storage operations of the energy storage loop of the circuit breaker is obtained according to the ending time of the previous energy storage operation and the starting time of the next energy storage operation of the two adjacent energy storage operations.
2. The method of circuit breaker tank fault diagnosis of claim 1, the method further comprising:
and according to the calculated theoretical short-circuit fault occurrence time and the actual time for detecting and identifying the short-circuit fault of the energy storage circuit of the circuit breaker, obtaining the time difference that the actual time for detecting and identifying the short-circuit fault of the energy storage circuit of the circuit breaker lags behind the calculated theoretical short-circuit fault occurrence time.
3. The method of circuit breaker tank fault diagnosis of claim 1, the method further comprising:
when the circuit breaker energy storage loop is determined to have the open circuit fault, counting all energy storage currents which are higher than the current lower limit value on the circuit breaker energy storage loop and the corresponding energy storage operation starting time and energy storage operation ending time, and calculating the theoretical open circuit fault occurrence time when the energy storage currents are lower than the current lower limit value according to all the counted energy storage currents which are higher than the current lower limit value and the corresponding energy storage operation starting time and energy storage operation ending time.
4. The method as claimed in claim 3, wherein the fault is determined by formula
Calculating the theoretical open-circuit fault occurrence time t when the energy storage current is lower than the current lower limit value m～low (ii) a Wherein, the first and the second end of the pipe are connected with each other,
I low is the current lower limit value; m is all values higher than the current lower limit value I low Total number of stored energy of, and n>3；I 1 ～I m Sequentially corresponding energy storage currents of the energy storage loop of the circuit breaker during the first to the mth energy storage work and being higher than the current lower limit value I low ；t 1-2 ～t m-1～m Are the interval time of two adjacent energy storage working of the energy storage loop of the circuit breaker according to the two adjacent energy storageThe ending time of the previous energy storage operation and the starting time of the next energy storage operation can be obtained.
5. The method of circuit breaker tank fault diagnosis of claim 4, said method further comprising:
and obtaining the time difference that the actual time for detecting and determining the open-circuit fault of the energy storage circuit of the circuit breaker lags behind the calculated theoretical open-circuit fault occurrence time according to the calculated theoretical open-circuit fault occurrence time and the actual time for detecting and determining the open-circuit fault of the energy storage circuit of the circuit breaker.
6. A fault recorder, comprising:
the current acquisition and detection unit is used for acquiring and detecting the energy storage current of the circuit breaker energy storage loop during each energy storage operation;
the short-circuit fault judging unit is used for determining that the short-circuit fault occurs in the energy storage loop of the circuit breaker if the fact that the energy storage current of the energy storage loop of the circuit breaker is gradually increased along with the increase of the energy storage times is detected until the energy storage current during certain energy storage work is higher than a preset current upper limit value;
the circuit breaking fault judging unit is used for determining that the circuit breaking fault occurs in the circuit breaker energy storage loop if the fact that the energy storage current of the circuit breaker energy storage loop is gradually reduced along with the increase of the energy storage times is detected until the energy storage current during certain energy storage work is lower than a preset current lower limit value;
wherein, still include: a short-circuit fault theoretical time tracing unit; wherein the content of the first and second substances,
the short-circuit fault theoretical time tracing unit is used for counting all energy storage currents lower than the current upper limit value and energy storage operation starting time and energy storage operation ending time corresponding to the energy storage currents respectively on the breaker energy storage circuit when the breaker energy storage circuit is determined to have a short-circuit fault, and calculating theoretical short-circuit fault occurrence time when the energy storage currents are higher than the current upper limit value according to all the counted energy storage currents lower than the current upper limit value and the energy storage operation starting time and the energy storage operation ending time corresponding to the energy storage currents respectively;
wherein, by the formula
Calculating the theoretical short-circuit fault occurrence time t when the energy storage current is higher than the current upper limit value n～f (ii) a Wherein the content of the first and second substances,
I f is the current upper limit value; n is all values below the current upper limit value I f Total number of stored energy of, and n>3；I 1 ～I n Energy storage currents corresponding to the circuit breaker energy storage loop in sequence from the first time to the nth time during energy storage work and all lower than the current upper limit value I f ；t 1～2 ～t n-1～n The interval time of the circuit breaker energy storage loop in two adjacent energy storage operations is obtained according to the end time of the previous energy storage operation and the starting time of the next energy storage operation of the two adjacent energy storage operations.
7. The fault recorder of claim 6, further comprising: a theoretical time tracing unit of open circuit fault; wherein, the first and the second end of the pipe are connected with each other,
and the open-circuit fault theoretical time tracing unit is used for counting all the energy storage currents higher than the current lower limit value on the circuit breaker energy storage loop and the corresponding energy storage operation starting time and energy storage operation ending time when the circuit breaker energy storage loop is judged to have open-circuit fault, and calculating the theoretical open-circuit fault occurrence time when the energy storage currents are lower than the current lower limit value according to all the counted energy storage currents higher than the current lower limit value and the corresponding energy storage operation starting time and energy storage operation ending time.
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