CN114740344A - Impedance angle deviation-based alternating current breaker step difference coordination test method and system - Google Patents
Impedance angle deviation-based alternating current breaker step difference coordination test method and system Download PDFInfo
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Abstract
The application is suitable for the technical field of power systems, and provides an alternating current breaker step difference coordination test method and system based on impedance angle deviation. The method comprises the following steps: acquiring a first voltage value, a second voltage value and a second current value of a tested circuit; calculating the offset time according to the first voltage value, the second voltage value and the second current value; simulating the maximum short-circuit fault of the short-circuit current for the tested circuit according to the offset time; detecting a first state of a tested alternating current circuit breaker and a second state of an upper-level tested alternating current circuit breaker in a tested circuit when the short-circuit current is in the maximum short-circuit fault; if the first state is switching-off and the second state is switching-on, the step difference is qualified. The method and the device can improve the accuracy of the test result and accurately judge whether the level difference fit is qualified.
Description
Technical Field
The application relates to the technical field of power systems, in particular to an alternating current breaker step matching test method and system based on impedance angle deviation.
Background
In an electric power system, an alternating current power supply is the most basic power supply of a substation. At present, most of feed networks of alternating current power supply systems for transformer substations adopt tree structures, and alternating current circuit breakers and the like are used as main protective electrical appliances. However, if the protection operation characteristics of the upper and lower ac circuit breakers are not matched, when the lower-stage consumer equipment has a short-circuit fault, the upper-stage ac circuit breaker may be tripped out of order, so as to cause the power failure of other feeder circuits, thereby enlarging the accident range.
In order to prevent potential safety hazards caused by mismatching of action characteristics of upper and lower-level alternating current circuit breakers, the alternating current power supply system of the newly-built transformer substation needs to be subjected to alternating current circuit breaker level difference matching test before commissioning and in the subsequent use process of the system so as to detect whether the alternating current circuit breaker level difference matching is qualified or not.
In the prior art, a parameter calibration method is usually adopted to carry out alternating current breaker level difference matching test on an alternating current power supply system, however, the method has more involved parameters and is difficult to find the parameters, and certain errors exist to cause low accuracy of test results.
Disclosure of Invention
In view of this, the embodiment of the present application provides an alternating current breaker step matching test method and system based on impedance angle deviation, so as to solve the technical problem that when an alternating current power supply system is subjected to an alternating current breaker step matching test by using an existing test method, a certain error exists, so that the accuracy of a test result is low.
In order to achieve the purpose, the technical scheme is as follows:
in a first aspect, an embodiment of the present application provides an ac circuit breaker step matching test method based on impedance angle deviation, including:
in a possible implementation manner of the first aspect, the obtaining a first voltage value, a second voltage value, and a second current value of the circuit under test includes:
when the tested circuit is in no-load, acquiring a first voltage value of the tested circuit;
and changing the test resistance values at two ends of the tested circuit to obtain a second voltage value and a second current value of the tested circuit.
In a possible implementation manner of the first aspect, the calculating an offset time according to the first voltage value, the second voltage value, and the second current value includes:
calculating the equivalent complex impedance of the circuit to be tested according to the first voltage value, the second voltage value and the second current value;
performing arc tangent processing on the equivalent complex impedance, and determining the phase difference between the alternating voltage and the alternating current of the tested circuit;
and determining an offset time according to the phase difference.
In a possible implementation manner of the first aspect, the simulating a short-circuit current maximum short-circuit fault for the circuit under test according to the offset time includes:
detecting the maximum moment of the alternating voltage of the circuit to be detected;
determining the maximum alternating current time of the tested circuit according to the maximum alternating voltage time and the offset time of the tested circuit;
and simulating the maximum short-circuit fault of the short-circuit current for the tested circuit at the moment of the maximum alternating current of the tested circuit.
In a possible implementation manner of the first aspect, the method for matching and testing the level difference of the ac circuit breaker based on the impedance angle offset further includes: and if the first state and the second state are both opening, the matching of the grade difference is unqualified.
In a second aspect, an embodiment of the present application provides an ac circuit breaker step matching test system based on impedance angle deviation, including: the intelligent control module, the voltage acquisition module, the current acquisition module, the adjustable impedance load module, the short-circuit fault simulation module and the switch state sensing module;
the intelligent control module is respectively in communication connection with the voltage acquisition module, the current acquisition module, the adjustable impedance load module, the short-circuit fault simulation module and the switch state sensing module;
the voltage acquisition module is used for acquiring a first voltage value and a second voltage value of the circuit to be detected;
the current acquisition module is used for acquiring a second current value of the circuit to be detected;
the adjustable impedance load module is used for changing the test resistance values at two ends of the tested circuit;
the short-circuit fault simulation module is used for simulating the maximum short-circuit fault of the short-circuit current for the tested circuit;
the switch state sensing module is used for detecting a first state of a tested alternating current circuit breaker in the tested circuit and a second state of a superior tested alternating current circuit breaker;
the intelligent control module is used for executing the impedance angle deviation-based alternating current breaker step matching test method according to any one of the first aspect.
In a possible implementation manner of the second aspect, the impedance angle offset-based ac circuit breaker step-difference coordination test system further includes: the data processing module is respectively in communication connection with the voltage acquisition module and the current acquisition module;
the data processing module is used for receiving a first voltage value and a second voltage value sent by the voltage acquisition module and receiving a second current value sent by the current acquisition module;
the data processing module is further used for calculating offset time according to the first voltage value, the second voltage value and the second current value.
In a possible implementation manner of the second aspect, the impedance angle offset-based ac circuit breaker step-difference coordination test system further includes: the first connecting terminal and the second connecting terminal;
the first connecting terminal and the second connecting terminal are used for respectively connecting a live wire connecting terminal and a zero wire connecting terminal of a tested alternating current circuit breaker in a tested circuit when the method for testing the level difference matching of the alternating current circuit breaker based on the impedance angle deviation is executed;
the first wiring terminal is respectively and electrically connected with the voltage acquisition module, the current acquisition module, the adjustable impedance load module and the short-circuit fault simulation module;
and the second wiring terminal is respectively and electrically connected with the voltage acquisition module, the current acquisition module, the adjustable impedance load module and the short-circuit fault simulation module.
In a possible implementation manner of the second aspect, the impedance angle offset-based ac circuit breaker step-difference coordination test system further includes: the display module is in communication connection with the intelligent control module;
and the display module is used for receiving the level difference matching result sent by the intelligent control module and displaying the level difference matching result.
In a possible implementation manner of the second aspect, the impedance angle offset-based ac circuit breaker step-difference coordination test system further includes: the alarm module is in communication connection with the intelligent control module;
the alarm module is used for receiving the level difference coordination result sent by the intelligent control module and carrying out alarm processing according to the level difference coordination result.
It is understood that the beneficial effects of the second aspect can be referred to the related description of the first aspect, and are not described herein again.
According to the method and the system for testing the matching of the level differences of the alternating current circuit breaker based on the impedance angle deviation, the first voltage value, the second voltage value and the second current value of the tested circuit are obtained, the deviation time is calculated according to the first voltage value, the second voltage value and the second current value, the maximum short-circuit fault of the short-circuit current is simulated for the tested circuit according to the deviation time, the first state of the tested alternating current circuit breaker and the second state of the superior tested alternating current circuit breaker in the tested circuit are detected when the maximum short-circuit fault of the short-circuit current occurs, and whether the matching of the level differences is qualified or not is judged according to the first state and the second state.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the specification.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments or the prior art description will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings may be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic view of an application scenario provided in an embodiment of the present application;
fig. 2 is a schematic flowchart of a method for testing matching of a level difference of an ac circuit breaker based on impedance angle deviation according to an embodiment of the present application;
fig. 3 is a schematic flowchart of a method for testing matching of a level difference of an ac circuit breaker based on impedance angle deviation according to an embodiment of the present application;
fig. 4 is a schematic flowchart of a method for testing matching of a level difference of an ac circuit breaker based on impedance angle deviation according to an embodiment of the present application;
fig. 5 is a schematic flowchart of a method for testing matching of a level difference of an ac circuit breaker based on impedance angle deviation according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an ac circuit breaker step matching test system based on impedance angle deviation according to an embodiment of the present application;
fig. 7 is an application connection diagram of an ac circuit breaker step matching test system based on impedance angle deviation according to an embodiment of the present application.
Detailed Description
The present application will be described more clearly with reference to specific examples. The following examples will assist those skilled in the art in further understanding the role of the present application, but are not intended to limit the application in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the application. All falling within the scope of protection of the present application.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
In the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used for distinguishing between descriptions and not necessarily for describing or implying relative importance.
Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.
In addition, the references to "a plurality" in the embodiments of the present application should be interpreted as two or more.
In an electric power system, an alternating current power supply is the most basic power supply of a transformer substation, continuously and reliably supplies power for primary and secondary equipment and production activities in the transformer substation, and is the basic guarantee for reliable operation of the transformer substation. At present, most of feed networks of alternating current power supply systems for transformer substations adopt tree structures, so that the power supply load is large, the loop distribution is wide, the alternating current circuit breakers and the like are generally adopted as main protection electric appliances for the outgoing line overcurrent or short-circuit faults when the power supply systems are changed from station use to electric equipment through three-stage and four-stage power distribution, and the alternating current circuit breakers play a role in breaking and isolating feed lines. However, if the protection operation characteristics of the upper and lower ac circuit breakers are not matched, when the lower-stage consumer equipment has a short-circuit fault, the upper-stage ac circuit breaker may be tripped out of order, so as to cause the power failure of other feeder circuits, thereby enlarging the accident range.
In order to prevent hidden danger caused by mismatching of action characteristics of upper and lower alternating current circuit breakers, the alternating current power supply system of the newly-built transformer substation needs to be subjected to alternating current circuit breaker level difference coordination test before commissioning, can be commissioned after being qualified, and meanwhile, the alternating current circuit breaker level difference coordination test also needs to be periodically carried out in the using process of the alternating current power supply system. In the prior art, a parameter calibration method is usually adopted to carry out alternating current breaker level difference matching test on an alternating current power supply system, however, the method has more involved parameters, the parameter searching is difficult, and certain errors exist to cause low accuracy of the test result.
Based on the above problems, the inventors found that the maximum alternating current time can be determined according to the phase difference between the alternating voltage and the alternating current of the circuit to be tested and the maximum alternating current time of the circuit to be tested, the short-circuit fault simulation with the maximum short circuit current is performed on the circuit to be tested when the alternating current is maximum, and whether the level difference matching is qualified or not can be tested by detecting the states of the upper and lower alternating current circuit breakers in the circuit to be tested.
That is to say, according to the embodiment of the application, the first voltage value, the second voltage value and the second current value of the tested circuit are obtained, the offset time is calculated according to the first voltage value, the second voltage value and the second current value, the maximum short-circuit fault of the short-circuit current is simulated for the tested circuit according to the offset time, and when the maximum short-circuit fault of the short-circuit current is detected, the first state of the tested alternating current circuit breaker in the tested circuit and the second state of the tested alternating current circuit breaker at the upper stage are detected, and whether the matching of the level difference is qualified or not is judged according to the first state and the second state, so that the accuracy of the test result can be improved, and whether the matching of the level difference is qualified or not can be accurately judged.
Fig. 1 is a schematic view of an application scenario provided in an embodiment of the present application. As shown in fig. 1, an ac circuit breaker level difference coordination test system 10 based on impedance angle deviation is connected to a live line connection end and a zero line connection end of a lower-level ac circuit breaker 20 in an ac power supply system, and is configured to collect voltages and currents at two ends of the lower-level ac circuit breaker 20, analyze and process the voltages and currents, determine a time when an ac current is maximum, simulate a short-circuit fault with a maximum short-circuit current at the time, and further determine whether level difference coordination is qualified according to the collected states of the lower-level ac circuit breaker 20 and the upper-level ac circuit breaker.
Fig. 2 is a schematic flowchart of a method for testing matching of a level difference of an ac circuit breaker based on impedance angle deviation according to an embodiment of the present application. As shown in fig. 2, the method in the embodiment of the present application may include:
In this embodiment, the circuit to be tested is an ac power supply side of the ac power supply system, and the circuit to be tested includes the ac circuit breaker to be tested and an upper-level ac circuit breaker of the ac circuit breaker to be tested, where the ac circuit breaker to be tested is a lower-level ac circuit breaker. The method comprises the steps of obtaining a first voltage value and a second voltage value of a tested circuit, actually obtaining voltages at two ends of a tested AC circuit breaker in the tested circuit, obtaining a second current of the tested circuit, and actually obtaining the current flowing through the tested AC circuit breaker.
In a possible implementation manner, referring to fig. 3, the obtaining a first voltage value, a second voltage value, and a second current value of the circuit under test in step 101 may specifically include:
Optionally, according to thevenin's theorem, the circuit to be tested, that is, the ac power supply side of the ac power supply system, may be equivalent to a single-port network in which an equivalent voltage source and an equivalent complex impedance are connected in series.
Illustratively, when the tested circuit is in no-load, namely the single-port network is in no-load, a first voltage value of the tested circuit is obtained, and the first voltage value is the voltage value of the equivalent voltage source of the single-port network.
And changing the test resistance values at the two ends of the tested circuit, namely changing the test resistance value at the output end of the single-port network, and acquiring a second voltage value and a second current value of the tested circuit.
Optionally, the first voltage value and the second voltage value are effective values of an ac voltage, and the second current value is an effective value of an ac current.
And 102, calculating the offset time according to the first voltage value, the second voltage value and the second current value.
In a possible implementation manner, referring to fig. 4, the calculating the offset time according to the first voltage value, the second voltage value, and the second current value in step 102 may specifically include:
Optionally, the first voltage value, the second voltage value, and the second current value are subjected to complex conversion to obtain a corresponding first complex voltage value, a corresponding second complex voltage value, and a corresponding second complex current value.
The equivalent complex impedance formula is:
in the formula (I), the compound is shown in the specification,
in order to be an equivalent complex impedance,
is a first complex voltage value, and is,
is the second complex voltage value and is the second complex voltage value,
is the second complex current value, R is the resistance, X is the reactance, j is the imaginary unit.
And step 1022, performing arc tangent processing on the equivalent complex impedance, and determining the phase difference between the alternating voltage and the alternating current of the circuit to be tested.
Optionally, the equivalent complex impedance is subjected to arc tangent processing to obtain an impedance angle, where the impedance angle is a phase difference between an alternating current voltage and an alternating current of the circuit to be tested.
The impedance angle formula is:
in the formula (I), the compound is shown in the specification,
is the impedance angle.
Illustratively, according to the phase difference and the alternating current periodThe offset time may be calculated. For example, if the frequency of the alternating current of the power grid in China is 50 Hz and the period of the alternating current is 20 ms, the offset time can be calculated to be
Milliseconds.
And 103, simulating the maximum short-circuit fault of the short-circuit current for the tested circuit according to the offset time.
In a possible implementation manner, referring to fig. 5, the calculating the offset time according to the first voltage value, the second voltage value, and the second current value in step 103 may specifically include:
And step 1032, determining the maximum alternating current time of the circuit to be tested according to the maximum alternating voltage time and the offset time of the circuit to be tested.
And 1033, simulating the maximum short-circuit fault of the short-circuit current for the tested circuit at the moment of the maximum alternating current of the tested circuit.
The maximum moment of the alternating current of the circuit to be tested can not be directly determined through detection, but the maximum moment of the alternating voltage of the circuit to be tested can be directly detected, so that the maximum moment of the alternating voltage of the circuit to be tested is detected, and the maximum moment of the alternating current of the circuit to be tested can be determined according to the offset time determined based on the phase difference.
Illustratively, the alternating voltage waveform of the circuit to be tested is collected, the maximum alternating voltage moment of the circuit to be tested is determined according to the alternating voltage waveform, and the offset time is further deviated from the maximum alternating voltage moment, so that the maximum alternating current moment of the circuit to be tested is obtained.
Specifically, a short-circuit fault is simulated on the tested circuit at the moment of the maximum alternating current of the tested circuit, the fault of the tested circuit can be simulated to the maximum extent, so that the matching of the alternating current breaker grade difference is qualified under the fault condition, when other faults occur on the tested circuit, the matching of the alternating current breaker grade difference is qualified, namely, a short-circuit fault is simulated on the tested circuit at the moment of the maximum alternating current of the tested circuit, and whether the matching of the tested alternating current breaker and the upper-level tested alternating current breaker grade difference is qualified or not is detected under the fault condition, so that the matching of the alternating current breaker grade difference can be accurately checked, and the accuracy of the test result is improved.
And 104, detecting a first state of the tested AC circuit breaker and a second state of a superior tested AC circuit breaker in the tested circuit when the short-circuit current is in the maximum short-circuit fault.
Optionally, the states of the ac circuit breaker to be tested and the ac circuit breaker to be tested at the upper level thereof may be open or closed, and the states of the ac circuit breaker to be tested and the ac circuit breaker to be tested at the upper level thereof are detected in a non-contact acquisition manner.
Specifically, if no electric signal is detected at the lower port of the tested ac circuit breaker, the state of the tested ac circuit breaker is open, otherwise, the state of the tested ac circuit breaker is closed. If no electric signal is detected at the upper opening of the tested AC circuit breaker, the state of the superior tested AC circuit breaker of the tested AC circuit breaker is open, otherwise, the state of the tested AC circuit breaker is closed.
And 105, if the first state is switching-off and the second state is switching-on, the step difference is qualified.
Optionally, if the first state and the second state are both open, the step is not matched.
Specifically, if the first state of the tested ac circuit breaker is open and the second state of the upper-level tested ac circuit breaker is closed, it indicates that when the short-circuit fault with the maximum short-circuit current occurs, the tested ac circuit breaker is normally open to disconnect and isolate the tested circuit, and the upper-level tested ac circuit breaker is not affected, and the level difference is qualified.
If the first state of the tested AC circuit breaker and the second state of the upper-level tested AC circuit breaker are both open-brake, it shows that when the maximum short-circuit fault of the short-circuit current occurs, the tested AC circuit breaker is normally open-brake, and the upper-level AC circuit breaker is tripped out by exceeding the level, and the level difference is unqualified in matching.
Optionally, if the first state of the measured ac circuit breaker is a switch-on state, it indicates that the measured ac circuit breaker or other components in the measured circuit have a fault, which also brings a potential safety hazard, and at this time, further maintenance is required.
According to the impedance angle offset-based alternating current breaker step matching test method, the first voltage value, the second voltage value and the second current value of the tested circuit are obtained, the offset time is calculated according to the first voltage value, the second voltage value and the second current value, the maximum short-circuit fault of the short-circuit current is simulated for the tested circuit according to the offset time, and when the maximum short-circuit fault of the short-circuit current is detected, the first state of the tested alternating current breaker and the second state of the superior tested alternating current breaker in the tested circuit are judged to be qualified or not according to the first state and the second state, the accuracy of a test result can be improved, and the step matching is accurately judged to be qualified or not.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
Fig. 6 is a schematic structural diagram of an ac circuit breaker step matching test system based on impedance angle deviation according to an embodiment of the present application. As shown in fig. 6, the ac breaker step matching test system 10 based on impedance angle deviation includes: the intelligent control module 11, the voltage acquisition module 12, the current acquisition module 13, the adjustable impedance load module 14, the short-circuit fault simulation module 15 and the switch state sensing module 16;
the intelligent control module 11 is respectively in communication connection with the voltage acquisition module 12, the current acquisition module 13, the adjustable impedance load module 14, the short-circuit fault simulation module 15 and the switch state sensing module 16;
the intelligent control module 11 is used for executing an alternating current breaker step matching test method based on impedance angle deviation.
The alternating current circuit breaker step matching test method based on impedance angle deviation can be an alternating current circuit breaker step matching test method based on impedance angle deviation provided by any embodiment of the application.
Optionally, the voltage collecting module 12 is configured to collect a first voltage value and a second voltage value of the circuit under test; the current collecting module 13 is used for collecting a second current value of the tested circuit; the adjustable impedance load module 14 is used for changing the test resistance value at two ends of the tested circuit; the short-circuit fault simulation module 15 is used for simulating the maximum short-circuit fault of the short-circuit current for the tested circuit; the switch state sensing module 16 is used for detecting a first state of a tested ac circuit breaker in a tested circuit and a second state of an upper-level tested ac circuit breaker thereof.
The voltage acquisition module 12, the current acquisition module 13, the adjustable impedance load module 14, the short-circuit fault simulation module 15, and the switch state sensing module 16 may all be implemented by using the prior art, and are not described herein again.
The alternating current breaker step difference coordination test system 10 based on the impedance angle deviation can realize the on-line test of whether the coordination of the tested alternating current breaker and the superior tested alternating current breaker in the tested circuit is qualified or not, and has the advantages of simple line connection and high test accuracy.
Optionally, the ac circuit breaker step-difference coordination test system 10 based on the impedance angle deviation further includes a data processing module (not shown).
Specifically, the data processing module is in communication connection with the voltage acquisition module and the current acquisition module respectively, and is configured to receive a first voltage value and a second voltage value sent by the voltage acquisition module 12, and receive a second current value sent by the current acquisition module 13.
The data processing module is further configured to calculate an offset time according to the first voltage value, the second voltage value, and the second current value.
Optionally, the ac circuit breaker step matching test system 10 based on the impedance angle deviation further includes a first connection terminal and a second connection terminal (not shown).
Specifically, the first connecting terminal and the second connecting terminal are used for respectively connecting a live wire connecting terminal and a zero line connecting terminal of a tested alternating current circuit breaker in a tested circuit when an alternating current circuit breaker step difference matching test method based on impedance angle deviation is executed.
Optionally, the first connection terminal is electrically connected to the voltage acquisition module 12, the current acquisition module 13, the adjustable impedance load module 14, and the short-circuit fault simulation module 15, respectively.
The second connection terminal is respectively electrically connected with the voltage acquisition module 12, the current acquisition module 13, the adjustable impedance load module 14 and the short-circuit fault simulation module 15.
Optionally, the ac circuit breaker step matching test system 10 based on impedance angle deviation further includes: and a display module (not shown) in communication connection with the intelligent control module 11.
The display module is used for receiving the level difference coordination result sent by the intelligent control module 11 and displaying the level difference coordination result, so that a worker can directly observe the level difference coordination result in time.
Optionally, the ac circuit breaker step matching test system 10 based on impedance angle deviation may further include: and the alarm module (not shown) is in communication connection with the intelligent control module 11.
The alarm module is used for receiving the level difference matching result sent by the intelligent control module 11 and carrying out alarm processing according to the level difference matching result. For example, when the matching result of the level difference is unqualified, alarm information is sent out, so that a worker can timely receive the unqualified matching result of the level difference. The alarm module may be a buzzer, an indicator light, or the like, and is not limited specifically herein. For example, when the alarm module is an indicator light, the indicator light is red when an unqualified level difference matching result is received.
Fig. 7 is an application connection diagram of an ac circuit breaker step matching test system based on impedance angle deviation according to an embodiment of the present application. As shown in fig. 7, in the ac power supply system for a single-phase station, an ac circuit breaker is used as a protection device. The alternating current power supply system for the single-phase station supplies power to a zero line N and a live line L of a direction-changing alternating current bus for the station, the current feeder panel supplies power to an alternating current load panel or a distribution box through in-panel alternating current breakers S11 and S12 … … S1N, and the alternating current load panel or the distribution box supplies power to an alternating current load through in-panel alternating current breakers SK1 and SK2 … … SKn.
Taking the example of testing whether the step difference matching of the AC circuit breaker SK2 and the superior AC circuit breaker S12 is qualified or not, the AC circuit breaker SK2 is disconnected, the actual load wiring of the live wire connecting end and the zero line connecting end of the lower port of the AC circuit breaker is disconnected, the first connecting terminal of the AC circuit breaker step difference matching testing system based on impedance angle deviation in the application is connected with the live wire connecting terminal, and the second connecting terminal is connected with the zero line connecting terminal; the ac circuit breaker SK2 is closed, and it is determined that all other ac circuit breakers in the ac power supply system for the single-phase station are in the closed state.
By adopting the alternating current breaker step matching test system based on impedance angle deviation described in the foregoing embodiments of the present application, the alternating current breaker SK2 is tested according to the alternating current breaker step matching test method based on impedance angle deviation described in the foregoing embodiments of the present application, and a step matching result is obtained.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. An alternating current breaker step matching test method based on impedance angle deviation is characterized by comprising the following steps:
acquiring a first voltage value, a second voltage value and a second current value of a tested circuit;
calculating offset time according to the first voltage value, the second voltage value and the second current value;
simulating the maximum short-circuit fault of the short-circuit current for the tested circuit according to the offset time;
detecting a first state of a tested alternating current circuit breaker and a second state of a superior tested alternating current circuit breaker in the tested circuit when the short-circuit current is in the maximum short-circuit fault;
and if the first state is switching-off and the second state is switching-on, the matching of the level difference is qualified.
2. The impedance angle offset-based alternating current breaker step coordination test method according to claim 1, wherein the obtaining of the first voltage value, the second voltage value and the second current value of the circuit under test comprises:
when the tested circuit is idle, acquiring a first voltage value of the tested circuit;
and changing the test resistance values at two ends of the tested circuit to obtain a second voltage value and a second current value of the tested circuit.
3. The method for matching and testing the level difference of the alternating current circuit breaker based on the impedance angle deviation as claimed in claim 1, wherein the step of calculating the deviation time according to the first voltage value, the second voltage value and the second current value comprises the following steps:
calculating the equivalent complex impedance of the circuit to be tested according to the first voltage value, the second voltage value and the second current value;
performing arc tangent processing on the equivalent complex impedance, and determining the phase difference between the alternating voltage and the alternating current of the tested circuit;
and determining an offset time according to the phase difference.
4. The impedance angle offset-based alternating current breaker step matching test method according to claim 1, wherein the simulating the maximum short-circuit fault of the short-circuit current to the circuit under test according to the offset time comprises:
detecting the maximum moment of the alternating voltage of the circuit to be detected;
determining the maximum alternating current time of the tested circuit according to the maximum alternating voltage time and the offset time of the tested circuit;
and simulating the maximum short-circuit fault of the short-circuit current for the circuit to be tested at the moment when the alternating current of the circuit to be tested is maximum.
5. The alternating current breaker step matching test method based on impedance angle deviation as claimed in any one of claims 1 to 4, characterized by further comprising:
and if the first state and the second state are both opening, the matching of the grade difference is unqualified.
6. An alternating current circuit breaker step coordination test system based on impedance angle deviation is characterized by comprising: the intelligent control module, the voltage acquisition module, the current acquisition module, the adjustable impedance load module, the short-circuit fault simulation module and the switch state sensing module;
the intelligent control module is respectively in communication connection with the voltage acquisition module, the current acquisition module, the adjustable impedance load module, the short-circuit fault simulation module and the switch state sensing module;
the voltage acquisition module is used for acquiring a first voltage value and a second voltage value of the circuit to be detected;
the current acquisition module is used for acquiring a second current value of the circuit to be detected;
the adjustable impedance load module is used for changing the test resistance values at two ends of the tested circuit;
the short-circuit fault simulation module is used for simulating the maximum short-circuit fault of the short-circuit current for the tested circuit;
the switch state sensing module is used for detecting a first state of a tested alternating current circuit breaker in the tested circuit and a second state of a superior tested alternating current circuit breaker;
the intelligent control module is used for executing the impedance angle deviation-based alternating current breaker step matching test method according to any one of claims 1 to 5.
7. The impedance angle offset based ac circuit breaker step-difference coordination test system according to claim 6, further comprising: the data processing module is respectively in communication connection with the voltage acquisition module and the current acquisition module;
the data processing module is used for receiving a first voltage value and a second voltage value sent by the voltage acquisition module and receiving a second current value sent by the current acquisition module;
the data processing module is further used for calculating offset time according to the first voltage value, the second voltage value and the second current value.
8. The impedance angle offset based ac circuit breaker step-difference coordination test system according to claim 6, further comprising: the first connecting terminal and the second connecting terminal;
the first connection terminal and the second connection terminal are used for respectively connecting a live wire terminal and a zero wire terminal of a tested alternating current circuit breaker in a tested circuit when the alternating current circuit breaker level difference matching test method based on impedance angle deviation in any one of claims 1-5 is executed;
the first wiring terminal is respectively and electrically connected with the voltage acquisition module, the current acquisition module, the adjustable impedance load module and the short-circuit fault simulation module;
and the second wiring terminal is respectively and electrically connected with the voltage acquisition module, the current acquisition module, the adjustable impedance load module and the short-circuit fault simulation module.
9. The impedance angle offset based ac circuit breaker step-difference coordination test system according to claim 8, further comprising: the display module is in communication connection with the intelligent control module;
and the display module is used for receiving the level difference matching result sent by the intelligent control module and displaying the level difference matching result.
10. The impedance angle offset based ac circuit breaker step-difference coordination test system according to claim 8, further comprising: the alarm module is in communication connection with the intelligent control module;
the alarm module is used for receiving the level difference coordination result sent by the intelligent control module and carrying out alarm processing according to the level difference coordination result.
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| CN117872109A (en) * | 2023-12-18 | 2024-04-12 | 广东柏腾物联科技有限公司 | Automatic-verification Internet of things circuit breaker and verification control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117872109A (en) * | 2023-12-18 | 2024-04-12 | 广东柏腾物联科技有限公司 | Automatic-verification Internet of things circuit breaker and verification control method thereof |
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