Method and device for monitoring non-full-phase opening of circuit breaker

Abstract

The invention provides a method and a device for monitoring non-full-phase opening of a circuit breaker, and belongs to the technical field of circuit breaker monitoring. According to the invention, the load side voltage signal and the three-phase current signal of the circuit breaker are detected, a series of operations such as logic NOT, logic AND, logic OR and the like are carried out on the signals to obtain first to fourth operation results, and then the monitoring result is obtained based on the results, so that simple and reliable monitoring is realized. For the condition that the prior art cannot be applied to a neutral point ungrounded or low-current grounded system, the monitoring method of the comprehensive voltage and current signals adopted by the invention does not depend on a specific grounding current condition, and has wider applicability. Meanwhile, by means of multi-signal multi-logical operation, the problems of misjudgment and missed judgment caused by a single signal or simple judgment are avoided, the monitoring accuracy and reliability are greatly improved, and a powerful guarantee is provided for stable operation of a power system.

Description

Technical Field

[0001] The invention belongs to the technical field of circuit breaker monitoring, and in particular relates to a monitoring method and device for non-full-phase opening of a circuit breaker. Background Art

[0002] In the power system, protection devices play a vital role in ensuring the safe and stable operation of the circuit. The power system is always facing various potential risks, such as overload and short circuit. Once these faults occur, they may cause serious damage to electrical equipment and even affect the normal operation of the entire power system. Therefore, various types of protection devices are widely used in various links of the power system to ensure the reliable operation of the system and maintain the stability and continuity of power supply.

[0003] As one of the commonly used protection devices in power systems, the three-phase linkage mechanism of the circuit breaker has a unique working mode and important application value. It adopts a three-phase linkage method. When any phase current in the circuit exceeds the rated value, the three-phase circuit breaker will act at the same time, which can automatically cut off the circuit, effectively prevent electrical equipment from burning out due to overload, and can isolate the fault circuit. In the 10kV compensation capacitor circuit breaker, the three-phase linkage mechanism of the circuit breaker needs to be frequently closed and opened every day, and the operation frequency can be as high as more than ten times a day, playing a key role in ensuring the stable operation of the power system.

[0004] At present, there are many problems with the three-phase linkage mechanism of circuit breakers widely used in 10kV compensation capacitor circuit breakers. Common faults include circuit breaker failure to close, opening failure, energy storage mechanism failure, and non-full-phase opening of vacuum circuit breakers. Although the first few faults can be judged by sound, signal indication and other information, the three-phase linkage mechanism circuit breaker has serious deficiencies in judging non-full-phase opening faults. On the one hand, the three-phase linkage mechanism has no protection and judgment criteria for three-phase inconsistency. When a non-full-phase opening fault occurs, the problem is complicated and the data is huge due to the different voltages and currents of the three-phase circuits. So far, there is a lack of a complete and reliable judgment method. On the other hand, the three-phase linkage mechanism has no non-full-phase closing status monitoring design. With the increase in the number of operations and the wear of the mechanical structure, the number of non-full-phase fault cases is increasing. At the same time, the existing circuit breaker non-full-phase protection technology mostly relies on the auxiliary contacts of the circuit breaker to start, and the three-phase linkage mechanism has no auxiliary contacts of the phase separation mechanism, so it is impossible to achieve non-full-phase protection. In addition, the three-phase linkage mechanism has a compact structure, and the insulating rod of the vacuum circuit breaker is blocked, which makes it easy to make misjudgments and missed judgments when a non-full-phase fault occurs. Although a patent proposes to use the one-phase voltage, one-phase current and neutral point current on the outgoing line to make non-full-phase opening judgments, this method cannot be applied to systems with ungrounded neutral points or small current grounding, and no neutral point current on the outgoing line. At this stage, there is still a lack of a simple and reliable method to judge the non-full-phase opening state of the circuit breaker. Summary of the invention

[0005] In view of this, the present invention aims to provide a monitoring method and related device for non-full-phase opening of a circuit breaker, so as to solve the problems in the prior art such as lack of a simple and reliable judgment method, inability to be applicable to a system with ungrounded neutral point or small current grounding, and easy occurrence of misjudgment and missed judgment, so as to provide a reliable basis for staff to handle faults.

[0006] In order to achieve the above object, the technical solution provided by the present invention is as follows:

[0007] In a first aspect, the present invention provides a method for monitoring a circuit breaker non-full-phase opening, comprising the following steps:

[0008] Detect the load side voltage signal and three-phase current signal of the circuit breaker;

[0009] Performing a logical NOT operation on the load side voltage signal to obtain a first operation result;

[0010] Performing a logical negation operation on the A-phase current and the B-phase current respectively, and performing a logical AND operation on the two logical negation operation results and the load-side voltage signal as a group of inputs to obtain a second operation result;

[0011] The three-phase current signals are used as a group of inputs to perform a logic OR operation and a logic AND operation respectively, and a logic NOT operation is performed after the logic AND operation, and a logic OR operation result, a logic NOT operation result and a load side voltage signal are used as a group of inputs to perform a logic AND operation to obtain a third operation result;

[0012] Performing a logic AND operation on the load-side voltage signal of the circuit breaker and the three-phase current signal as a group of inputs to obtain a fourth operation result;

[0013] A monitoring result of non-full-phase opening of the circuit breaker is obtained based on the first operation result, the second operation result, the third operation result and the fourth operation result.

[0014] Further, when the first operation result is 1, and the second operation result, the third operation result and the fourth operation result are all 0, the monitoring result is that the three-phase switch is evenly opened.

[0015] Further, when the second operation result is 1, and the first operation result, the third operation result and the fourth operation result are all 0, the monitoring result is that one phase is not opened.

[0016] Further, when the third operation result is 1, and the first operation result, the second operation result and the fourth operation result are all 0, the monitoring result is that the two phases are not opened.

[0017] Further, when the fourth operation result is 1, and the first operation result, the second operation result and the third operation result are all 0, the monitoring result is that all three phases are in the closed position.

[0018] In a second aspect, the present invention provides a monitoring device for non-full-phase opening of a circuit breaker, comprising:

[0019] A relay module, comprising a voltage relay, a first current relay, a second current relay and a third current relay;

[0020] A logic operation module, comprising a first NOT gate module, a second NOT gate module, a third NOT gate module, a fourth NOT gate module, a first AND gate module, a second AND gate module, a third AND gate module and a first OR gate module;

[0021] A display module, comprising a first display, a second display, a third display and a fourth display;

[0022] The load side voltage of the circuit breaker is respectively connected to the input end of the first NOT gate module, the input end of the first AND gate module and the input end of the second AND gate module through a voltage relay;

[0023] The A-phase current of the circuit breaker is respectively connected to the input end of the second NOT gate module, the input end of the first OR gate module and the input end of the third AND gate module through the first current relay, and the output end of the second NOT gate module is connected to the input end of the first AND gate module;

[0024] The B-phase current of the circuit breaker is respectively connected to the input end of the third NOT gate module, the input end of the first OR gate module and the input end of the third AND gate module through the second current relay, and the output end of the third NOT gate module is connected to the input end of the first AND gate module;

[0025] The C-phase current of the circuit breaker is connected to the input end of the first OR gate module and the input end of the third AND gate module respectively through the third current relay, the output end of the first OR gate module is connected to the input end of the second AND gate module, and the output end of the third AND gate module is connected to the input end of the fourth NOT gate module;

[0026] The output end of the first NOT gate module is connected to the first display, the output end of the first AND gate module is connected to the second display, the output end of the second AND gate module is connected to the third display, and the output end of the third AND gate module is connected to the fourth display.

[0027] Furthermore, when the three phases of the circuit breaker are evenly disconnected, the first display is displayed, and the second display, the third display and the fourth display are not displayed.

[0028] Furthermore, when one phase of the circuit breaker is not opened, the second display is displayed, and the first display, the third display and the fourth display are not displayed.

[0029] Furthermore, when two phases of the circuit breaker are not opened, the third display is displayed, and the first display, the second display and the fourth display are not displayed.

[0030] Furthermore, when the three phases of the circuit breaker are all in the closed position, the fourth display is displayed, and the first display, the second display and the third display are not displayed.

[0031] In summary, the present invention provides a monitoring method and device for non-full-phase opening of a circuit breaker. The present invention detects the voltage signal and three-phase current signal on the load side of the circuit breaker, and performs a series of operations such as logical negation, logical AND, and logical OR on these signals to obtain the first to fourth operation results, and then obtains the monitoring results based on these results, thereby achieving simple and reliable monitoring. For situations where the prior art cannot be applied to systems with ungrounded neutral points or small current grounding systems, the monitoring method of the integrated voltage and current signals adopted by the present invention does not rely on specific grounding current conditions and has a wider range of applicability. At the same time, through multi-signal and multi-logical operations, the problem of misjudgment and missed judgment caused by a single signal or simple judgment is avoided, which greatly improves the accuracy and reliability of monitoring and provides a strong guarantee for the stable operation of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 A flow chart of a method for monitoring non-full-phase opening of a circuit breaker provided by an embodiment of the present invention;

[0034] Figure 2 A logic schematic diagram of a monitoring device for non-full-phase opening of a circuit breaker provided by an embodiment of the present invention;

[0035] Figure 3 An electrical wiring diagram of a 10kV compensation capacitor circuit breaker provided in an embodiment of the present invention;

[0036] Figure 4 A phasor diagram of three-phase voltage provided by an embodiment of the present invention;

[0037] Figure 5 A CT secondary circuit diagram provided by an embodiment of the present invention;

[0038] Figure 6 A current relay contact diagram provided for an embodiment of the present invention;

[0039] Figure 7 A diagram of a switch cabinet energized indicator light LE1 and a voltage relay UJ provided in an embodiment of the present invention;

[0040] Figure 8A voltage relay contact diagram provided for an embodiment of the present invention;

[0041] Fig. 9 A schematic diagram of a logic digital circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] See also Figure 1 The embodiment of the present invention provides a monitoring method for non-full-phase opening of a circuit breaker, comprising the following steps:

[0044] S1: Detect the load side voltage signal and three-phase current signal of the circuit breaker.

[0045] S2: Perform a logical NOT operation on the load side voltage signal to obtain a first operation result.

[0046] It should be noted that in logical operations, the NOT operation can reverse the logical state of the original signal. According to the logical NOT operation rules, if the voltage signal on the load side is high (logical 1), the result after the NOT operation is low (logical 0); conversely, if the voltage signal on the load side is low (logical 0), the NOT operation result is high (logical 1).

[0047] S3: Perform a logical negation operation on the A-phase current and the B-phase current respectively, and perform a logical AND operation on the two logical negation operation results and the load-side voltage signal as a group of inputs to obtain a second operation result.

[0048] It should be noted that firstly, the A phase current and the B phase current are respectively negated to obtain their respective negation results. Then, according to the logic AND operation rule, only when the three input signals (the two negation results and the load side voltage signal) are all at a high level (logic 1), the result of the AND operation is a high level (logic 1), otherwise it is a low level (logic 0).

[0049] S4: Take the three-phase current signals as a group of inputs to perform logic OR operation and logic AND operation respectively, and then perform logic NOT operation after the logic AND operation, and take the logic OR operation result, the logic NOT operation result and the load side voltage signal as a group of inputs to perform logic AND operation to obtain a third operation result.

[0050] It should be noted that the three-phase current signals are firstly subjected to a logical OR operation. As long as one of the three-phase currents is at a high level, the OR operation result is a high level. Then, the three-phase current signals are subjected to a logical AND operation. Only when all three-phase currents are at a high level, the AND operation result is a high level. Then, the AND operation result is subjected to a NOT operation. Finally, the logical OR operation result, the NOT operation result, and the load-side voltage signal are subjected to an AND operation, and a third operation result is obtained according to the AND operation rule.

[0051] S5: taking the load-side voltage signal of the circuit breaker and the three-phase current signal as a group of inputs to perform a logic AND operation to obtain a fourth operation result.

[0052] It should be noted that according to the logic AND operation rules, the result of the AND operation is a high level (logic 1) only when the load side voltage signal and the three-phase current signal are both at a high level (logic 1), otherwise it is a low level (logic 0).

[0053] S6: Obtaining a monitoring result of the circuit breaker not being fully-phase opened based on the first operation result, the second operation result, the third operation result and the fourth operation result.

[0054] It should be noted that the logic operation results obtained in the previous steps are comprehensively and accurately judged whether the circuit breaker is in a non-full-phase opening state and the specific opening type. Through the comprehensive analysis of multiple logic operation results, misjudgment caused by a single signal or simple judgment can be avoided, and the accuracy and reliability of monitoring can be improved.

[0055] This embodiment provides a monitoring method for non-full-phase opening of a circuit breaker, which fully mines the circuit breaker opening and closing state information contained in these electrical signals by performing multi-dimensional logical operations on the load-side voltage signal and three-phase current signal of the circuit breaker. By using the combination and comprehensive analysis of logical operations, complex electrical signals are converted into simple logical results, thereby realizing accurate monitoring of the non-full-phase opening state of the circuit breaker. This method has high accuracy and reliability, and can effectively avoid the problems of misjudgment and missed judgment that are prone to occur in the prior art. At the same time, this method does not rely on specific grounding current conditions, is suitable for neutral point ungrounded or low current grounding systems, and has a wider range of applicability. Through the comprehensive judgment of multiple logical operation results, different types of non-full-phase opening faults can be identified more carefully, providing a strong guarantee for the safe operation of the power system.

[0056] In one embodiment, when the first operation result is 1, and the second operation result, the third operation result and the fourth operation result are all 0, the monitoring result is that the three-phase equal opening is achieved.

[0057] In one embodiment, when the second operation result is 1, and the first operation result, the third operation result, and the fourth operation result are all 0, the monitoring result is that one phase is not opened.

[0058] In one embodiment, when the third operation result is 1, and the first operation result, the second operation result, and the fourth operation result are all 0, the monitoring result is that the two-phase circuit breaker is not disconnected.

[0059] In one embodiment, when the fourth operation result is 1, and the first operation result, the second operation result, and the third operation result are all 0, the monitoring result is that all three phases are in the closed position.

[0060] See also Figure 2 The embodiment of the present invention further provides a monitoring device for non-full-phase opening of a circuit breaker. Figure 2 The following is a logical diagram of the device. Figure 2 U is the load side voltage of the circuit breaker, I A is the circuit breaker A phase current, I B is the circuit breaker B phase current, I C is the C phase current of the circuit breaker, NOT1 is the first NOT gate module, NOT2 is the second NOT gate module, NOT3 is the third NOT gate module, NOT4 is the fourth NOT gate module, OR1 is the first OR gate module, AND1 is the first AND gate module, AND2 is the second AND gate module, AND3 is the third AND gate module, L1 is the first display; L2 is the second display; L3 is the third display; L4 is the fourth display, and the output terminals F1, F2, F3, and F4 are connected to the displays respectively. The design of the device is as follows:

[0061] A relay module, comprising a voltage relay, a first current relay, a second current relay and a third current relay;

[0062] A logic operation module, comprising a first NOT gate module NOT1, a second NOT gate module NOT2, a third NOT gate module NOT3, a fourth NOT gate module NOT4, a first AND gate module AND1, a second AND gate module AND2, a third AND gate module AND3 and a first OR gate module OR1;

[0063] A display module, comprising a first display L1, a second display L2, a third display L3 and a fourth display L4;

[0064] The load side voltage U of the circuit breaker is respectively connected to the input end of the first NOT gate module NOT1, the input end of the first AND gate module AND1 and the input end of the second AND gate module AND2 through the voltage relay;

[0065] Circuit breaker A phase current I A The first current relay is respectively connected to the input end of the second NOT gate module NOT2, the input end of the first OR gate module OR1 and the input end of the third AND gate module AND3, and the output end of the second NOT gate module NOT2 is connected to the input end of the first AND gate module AND1;

[0066] Circuit breaker B phase current I B The second current relay is respectively connected to the input end of the third NOT gate module NOT3, the input end of the first OR gate module OR1 and the input end of the third AND gate module AND3, and the output end of the third NOT gate module NOT3 is connected to the input end of the first AND gate module AND1;

[0067] Circuit breaker C phase current I C The third current relay is respectively connected to the input end of the first OR gate module OR1 and the input end of the third AND gate module AND3, the output end of the first OR gate module OR1 is connected to the input end of the second AND gate module AND2, and the output end of the third AND gate module AND3 is connected to the input end of the fourth NOT gate module NOT4;

[0068] The output end F1 of the first NOT gate module NOT1 is connected to the first display L1, the output end F2 of the first AND gate module AND1 is connected to the second display L2, the output end F3 of the second AND gate module AND2 is connected to the third display L3, and the output end F4 of the third AND gate module AND3 is connected to the fourth display L4.

[0069] Figure 2 The logical expression is as follows:

[0070]

[0071] (1) When the three phases are equally divided, U=0, F1=1, the output is high level, and the corresponding display L1 connected to F1 is displayed. F2, F3, and F4 are all 0, the output is low level, and the corresponding displays L2, L3, and L4 connected to them are not displayed.

[0072] (2) When one phase is not disconnected, U=1, I A =0,I B =0, F2=1, the output is high level, and the corresponding display L2 connected to F2 has display; F1, F3, and F4 are all 0, the output is low level, and the corresponding displays L1, L3, and L4 connected to them have no display.

[0073] (3) When the two phases are not disconnected, U = 1 and I A =1,I B =1,I C =0 or I A =1,I B =0,I C =1 or I A =0,I B =1,I C=1, F3=1, the output is high level, and the corresponding display L3 connected to F3 has display; F1, F2, and F4 are all 0, the output is low level, and the corresponding displays L1, L2, and L4 connected to them have no display.

[0074] (4) When all three phases are in the closed position, U=1, I A =1,I B =1,I C =1, F4=1, the output is high level, and the corresponding display L4 connected to F4 has display; F1, F2, and F3 are all 0, the output is low level, and the corresponding displays L1, L2, and L3 connected to them have no display.

[0075] The above logic circuit is used to realize the status display of various non-full-phase opening of the circuit breaker, so as to judge the type of non-full-phase opening, and provide reliable support for the staff to take appropriate treatment measures.

[0076] The following combination Figure 3-9 A method for constructing a monitoring device for the above-mentioned circuit breaker non-full-phase opening is introduced. The method first obtains the electrical wiring diagram and phasor diagram of the 10kV compensation capacitor circuit breaker. The electrical main wiring diagram of the 10kV compensation capacitor circuit breaker is as follows: Figure 3 As shown, when the capacitor is operating normally, the three-phase capacitors A, B, and C and the three-phase discharge coils are all connected in star, the neutral point is not grounded, and each phase capacitor works at the voltage between the phase and the neutral point, that is, the phase voltage. Figure 4 It is the phasor diagram of three-phase voltage.

[0077] in, Figure 3 The definitions of the letters in are as follows: QF is the circuit breaker, LE1 is the switch cabinet power indicator, Cab is the cable, Rea is the reactor, LE2 is the capacitor bank power indicator, MOA is the lightning arrester, pT is the discharge coil, CAp is the capacitor, moa is the neutral point lightning arrester, O is the neutral point, A′, B′, C′ are the A phase, B phase, and C phase on the capacitor side of the circuit breaker. Figure 4 The letters in the table are defined as follows: AB is the line voltage between phase A and phase B, U CA is the line voltage between phase C and phase A, U BC is the line voltage between phase B and phase C. From the phasor diagram and wiring diagram, we can see that:

[0078] (1) When the three phases of the circuit breaker are equally divided, the voltage of the three phases A′, B′, and C′ are all 0, the three phase current is 0, there is no voltage on the capacitor bus, and the power indicator light is not displayed.

[0079] (2) When one phase of the circuit breaker is not disconnected, the voltage of this phase is applied to the other two phases through the discharge coil and the capacitor via the neutral point. Assuming that the circuit breaker AB phase is disconnected and C phase is not disconnected, the C phase voltage is applied to the neutral point through the C phase cable through the capacitor and the discharge coil, and then from the neutral point through the A and B phase capacitors and the discharge coil to the A and B phase bus, so that the three-phase bus and the neutral point of the capacitor group are all carrying the C phase voltage, that is, the voltage between each phase of the capacitor group and the neutral point is 0, and the three-phase bus current flowing through the capacitor is 0, so that the three phases of the capacitor group are all carrying the C phase voltage. Since the power indicator light is connected between the phase and the ground, the three-phase power indicator light shows that there is power.

[0080] (3) When two phases of the circuit breaker are not disconnected. Assume that only phases A and B are closed, and phase C is open. At this time, the voltage between phases A and B is applied between the capacitors of phases A and B and the reactors connected in series. ,but

[0081]

[0082]

[0083] That is, there is voltage between the three phases A, B, and C and the neutral point, there is voltage on the three-phase busbars of the capacitor, and the three-phase power indicator light shows that there is power.

[0084] (4) When the three phases of the circuit breaker are in the closed position, when the A, B, and C voltages are applied to the capacitor bank bus, the neutral point voltage is 0, and the voltage between each phase and the neutral point is the phase voltage, that is, UA, UB, and UC; current flows through the three phases A, B, and C, the capacitor bus has voltage, and the three-phase power indicator light shows that there is power.

[0085] According to the above analysis, the voltage and current values ​​of the three-phase circuit breaker in various opening conditions are represented by logical values, 1 represents voltage or current, and 0 represents no voltage or current. The results are shown in Table 1 (the first logical table).

[0086] Table 1: Voltage and current logic values ​​for each opening condition of the circuit breaker

[0087]

[0088] 1) The current from the A, B, and C phases on the secondary side of the current transformer (CT) of the circuit breaker flows through the current relays LA, LB, and LC and returns through the N line. Figure 5 As shown, the A, B, and C phase connections of the relay are as follows: Figure 6 As shown, when no current flows through the current relay, its normally closed contact is turned on, that is, 1 and 2 are turned on; when current flows through the current relay, its normally open contact is turned on, that is, 1 and 3 are turned on.

[0089] 2) Connect voltage relay UJ in parallel with the power indicator light of the switch cabinet, such as Figure 7 As shown, C1, C2 and C3 are all capacitors, and the contacts of the voltage relay are as follows Figure 8 As shown, when there is no voltage at both ends of the voltage relay, its normally closed contact is connected, that is, 1 and 2 are connected. When there is voltage at both ends of the voltage relay, its normally open contact is connected, that is, 1 and 3 are connected.

[0090] 3) Use the NOT gate and AND gate of the digital circuit to form a logical digital circuit, so that the input end of the logical digital circuit is connected to the normally open and normally closed contacts of the current relay or voltage relay, and the normally open and normally closed contacts are connected to the high level (+5V) and low level (ground) respectively, such as Fig. 9 The output end of the logic digital circuit is connected to the display corresponding to "three-phase evenly divided gate", "one phase not divided gate", "two phases not divided gate" and "three phases not divided gate".

[0091] Finally, four displays L1, L2, L3, and L4 are provided and connected to the output terminals F1, F2, F3, and F4 of the logic circuit respectively. The displays of the displays L1, L2, L3, and L4 are realized through the logic circuit to judge the type of incomplete phase opening of the circuit breaker.

[0092] Under normal working conditions, one and only one of the four indicators L1, L2, L3, and L4 should be on. If all four indicators are off or two or more indicators are on, it is an abnormal state.

[0093] The terms "first", "second", "third", "fourth", etc. in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0094] It should be understood that in this application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0095] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0096] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0097] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0098] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (full name in English: Read-Only Memory, English abbreviation: ROM), random access memory (full name in English: Random Access Memory, English abbreviation: RAM), disk or optical disk and other media that can store program codes.

[0099] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A monitoring method for non-full-phase opening of a circuit breaker, characterized in that: The steps include: Detect the load side voltage signal and three-phase current signal of the circuit breaker; Performing a logical NOT operation on the load-side voltage signal to obtain a first operation result; Performing a logical negation operation on the A-phase current and the B-phase current respectively, and performing a logical AND operation on the two logical negation operation results and the load-side voltage signal as a group of inputs to obtain a second operation result; The three-phase current signals are used as a group of inputs to perform a logic OR operation and a logic AND operation respectively, and a logic NOT operation is performed after the logic AND operation, and a logic OR operation result, a logic NOT operation result and the load side voltage signal are used as a group of inputs to perform a logic AND operation to obtain a third operation result; Performing a logic AND operation on the circuit breaker load side voltage signal and the three-phase current signal as a group of inputs to obtain a fourth operation result; A monitoring result of non-full-phase opening of the circuit breaker is obtained based on the first operation result, the second operation result, the third operation result and the fourth operation result.

2. The monitoring method for non-full-phase opening of a circuit breaker according to claim 1, characterized in that: When the first operation result is 1, and the second operation result, the third operation result and the fourth operation result are all 0, the monitoring result is that the three-phase equal opening is achieved.

3. The monitoring method for non-full-phase opening of a circuit breaker according to claim 1, characterized in that: When the second operation result is 1, and the first operation result, the third operation result and the fourth operation result are all 0, the monitoring result is that one phase is not opened.

4. The monitoring method for non-full-phase opening of a circuit breaker according to claim 1, characterized in that: When the third operation result is 1, and the first operation result, the second operation result and the fourth operation result are all 0, the monitoring result is that the two-phase circuit breaker is not opened.

5. The monitoring method for non-full-phase opening of a circuit breaker according to claim 1, characterized in that: When the fourth operation result is 1, and the first operation result, the second operation result and the third operation result are all 0, the monitoring result is that all three phases are in the closed position.

6. A monitoring device for non-full-phase opening of a circuit breaker, characterized in that: include: A relay module, comprising a voltage relay, a first current relay, a second current relay and a third current relay; A logic operation module, comprising a first NOT gate module, a second NOT gate module, a third NOT gate module, a fourth NOT gate module, a first AND gate module, a second AND gate module, a third AND gate module and a first OR gate module; A display module, comprising a first display, a second display, a third display and a fourth display; The load side voltage of the circuit breaker is respectively connected to the input end of the first NOT gate module, the input end of the first AND gate module and the input end of the second AND gate module through the voltage relay; The A-phase current of the circuit breaker is respectively connected to the input end of the second NOT gate module, the input end of the first OR gate module and the input end of the third AND gate module through the first current relay, and the output end of the second NOT gate module is connected to the input end of the first AND gate module; The B-phase current of the circuit breaker is respectively connected to the input end of the third NOT gate module, the input end of the first OR gate module and the input end of the third AND gate module through the second current relay, and the output end of the third NOT gate module is connected to the input end of the first AND gate module; The C-phase current of the circuit breaker is connected to the input end of the first OR gate module and the input end of the third AND gate module respectively through the third current relay, the output end of the first OR gate module is connected to the input end of the second AND gate module, and the output end of the third AND gate module is connected to the input end of the fourth NOT gate module; The output end of the first NOT gate module is connected to the first display, the output end of the first AND gate module is connected to the second display, the output end of the second AND gate module is connected to the third display, and the output end of the third AND gate module is connected to the fourth display.

7. The monitoring device for non-full-phase opening of a circuit breaker according to claim 6, characterized in that: When the three phases of the circuit breaker are equally opened, the first display is displayed, and the second display, the third display and the fourth display are all not displayed.

8. The monitoring device for non-full-phase opening of a circuit breaker according to claim 6, characterized in that: When one phase of the circuit breaker is not opened, the second display is displayed, and the first display, the third display and the fourth display are all not displayed.

9. The monitoring device for non-full-phase opening of a circuit breaker according to claim 6, characterized in that: When the two phases of the circuit breaker are not opened, the third display is displayed, and the first display, the second display and the fourth display are not displayed.

10. The monitoring device for non-full-phase opening of a circuit breaker according to claim 6, characterized in that: When the three phases of the circuit breaker are all in the closed position, the fourth display is displayed, and the first display, the second display and the third display are all not displayed.

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