CN114415005A - Method and device for identifying three-phase inconsistency of circuit breaker - Google Patents
Method and device for identifying three-phase inconsistency of circuit breaker Download PDFInfo
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- CN114415005A CN114415005A CN202111527136.4A CN202111527136A CN114415005A CN 114415005 A CN114415005 A CN 114415005A CN 202111527136 A CN202111527136 A CN 202111527136A CN 114415005 A CN114415005 A CN 114415005A
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Abstract
The invention discloses a method and a device for identifying three-phase inconsistency of a circuit breaker, which are used for acquiring a circuit breaker vibration signal and a three-phase electric field intensity signal and judging whether the circuit breaker shifts or not according to the circuit breaker vibration signal; and if the circuit breaker is judged to be displaced, judging whether the three phases of the circuit breaker are successfully switched on or not by utilizing the three-phase electric field intensity signal of the circuit breaker. The method reliably identifies the three-phase inconsistent state, and secondly reduces the circuit correlation with the prior art to the maximum extent, does not introduce the auxiliary contact of the circuit breaker and monitor the position of the relay, acquires other fault characteristic quantities in a non-contact mode, and realizes the identification of the three-phase inconsistent state.
Description
Technical Field
The invention relates to the field of intelligent electronic equipment, in particular to a method for identifying three-phase inconsistency of a circuit breaker.
Background
In a neutral point grounding system, a high-voltage circuit breaker is important equipment of a transformer substation, can draw and close no-load current and load current in a high-voltage circuit when the system operates normally, and can cut off overload current and short-circuit current under the action of a relay protection device when the system operates abnormally.
The inconsistent three phases of the circuit breakers means a non-full-phase operation state that one phase or two phases of the circuit breakers are disconnected on a certain branch of the power system. In the power production, the circuit breaker has one-phase or two-phase error tripping or stealing tripping, the circuit breaker has three-phase contact asynchronous closing, the relay protection device selects the phase and trips, and the like, which can cause inconsistent operation of three phases of the circuit breaker, also called as non-full-phase operation. When the circuit breaker is operated in a non-full-phase mode, large negative sequence and zero sequence components exist in a system, three-phase inconsistent protection needs to be configured, and on the basis of accurately identifying the three-phase inconsistent state of the circuit breaker, the circuit breaker is tripped out in a delayed mode, and the non-full-phase operation state of the circuit breaker is finished.
The circuit breaker is identified to be in a three-phase inconsistent state, and the three-phase inconsistent opening is the core part of three-phase inconsistent protection. The technical scheme at present mainly comprises two categories of three-phase inconsistent protection of a circuit breaker body and three-phase inconsistent protection of an electrical quantity of a microcomputer type protection device.
The inconsistent protection of three phases of the circuit breaker body is to connect the normally open auxiliary contacts and the normally closed auxiliary contacts of the circuit breaker A, B, C in parallel respectively and then in series, and then to connect the time relay in series. When the circuit breaker is in a three-phase inconsistent state, the contact of the circuit breaker is closed through the action delay of the time relay, the outlet intermediate relay is started, the three phases of the circuit breaker are tripped by the outlet relay, and a typical protection design mode is shown in figure 1. In the figure 1, LP represents three-phase inconsistent pressing plates, DL, DLB and DLC respectively represent three-phase auxiliary contacts of an isolated phase breaker ABC, a loop is formed by 3 pairs of normally open contacts and normally closed contacts, KT represents a three-phase inconsistent time relay and a corresponding contact, and TX represents a contactor and is used for breaker control. When the circuit breaker has one-phase or two-phase disconnection operation, at least one pair of contacts of the normally open contact and the normally closed contact are in a closed state respectively, the circuit is conducted, and three-phase inconsistent protection of the circuit breaker is started (three-phase inconsistent pressing plates are put into operation). The three-phase inconsistent time relay acts after setting and delaying, a contactor loop is conducted, and three phases of the circuit breaker are tripped.
The microcomputer protection electric quantity three-phase inconsistent protection is that when the three-phase inconsistent protection is put into operation, any phase TWJ acts, and no current exists, the phase switch is confirmed to be at the tripping position, and when any phase is at the tripping position and the three phases are not completely at the tripping position, the phase switch is confirmed to be inconsistent. The three-phase inconsistent protection can be opened through zero sequence current or negative sequence current, and the switching-in and switching-out of the three-phase inconsistent protection are controlled by an inconsistent zero negative sequence current control word. When the inconsistent actuation conditions are met through the inconsistent three-phase protection time, the circuit breaker is tripped at the outlet. A logic diagram of a typical microcomputer protection electrical quantity three-phase inconsistent protection is shown in fig. 2. The identification of three-phase inconsistent state of microcomputer protection electric quantity three-phase inconsistent protection is generally locked by zero sequence and negative sequence.
The field experience shows that the problems that a normally-open and normally-closed auxiliary contact of a breaker mechanism is damaged, a three-phase inconsistent time relay is easily influenced by an external adverse operation environment and the like exist in the actual operation, the three-phase inconsistent state cannot be correctly identified, and further three-phase inconsistent protection is refused to operate.
More importantly, the identification of the three-phase inconsistent state of the three-phase inconsistent protection of the circuit breaker body is only used for the three-phase inconsistent protection of the circuit breaker body, generally the identification result of the three-phase inconsistent state is not allowed to be led out for other purposes, and the identification result cannot be directly used for purposes such as circuit breaker fault diagnosis.
The field experience shows that TWJ abnormity exists in actual operation, so that a three-phase inconsistency state cannot be identified, and three-phase inconsistency protection refuses to operate. Meanwhile, when the switch is switched off, the arc discharge phenomenon causes the condition that the TWJ is switched in and the corresponding switch still has current, which leads to the failure of correctly identifying the three-phase inconsistent state and causes the refusal of the three-phase inconsistent protection. The problem causes a great hidden trouble that zero sequence backup protection override tripping of adjacent lines is caused by long-time non-full-phase operation of the circuit breaker.
In addition, the three-phase inconsistent protection of the electric quantity is usually opened through zero sequence and negative sequence current, and the problem of failure in the case of light load of a line exists. More importantly, the identification of the three-phase inconsistent state of the microcomputer protection electric quantity three-phase inconsistent protection is only used for the microcomputer protection electric quantity three-phase inconsistent protection per se, and the extraction of the identification result of the three-phase inconsistent state is not allowed to be used for other purposes generally.
Disclosure of Invention
Aiming at the defects of the prior art, the invention considers that the three-phase inconsistent protection function is independently realized no matter the three-phase inconsistent protection of the breaker body or the three-phase inconsistent protection of the microcomputer protection electric quantity; and for the two existing methods, the circuits need to be kept relatively independent due to reliability, and the three-phase inconsistency identification results of the two technologies are not suitable for other purposes (such as breaker fault diagnosis). In order to solve the technical problem, the invention adopts the following technical scheme.
The method for identifying the three-phase inconsistency of the circuit breaker comprises the following steps: collecting a breaker vibration signal and a three-phase electric field strength signal, and judging whether the breaker is displaced or not according to the breaker vibration signal;
and if the circuit breaker is judged to be displaced, judging whether the three phases of the circuit breaker are successfully switched on or not by utilizing the three-phase electric field intensity signal of the circuit breaker.
Further, whether the circuit breaker takes place to shift is judged according to circuit breaker vibration signal, include: and acquiring breaker vibration signals according to a set sampling frequency, and if the number of the breaker vibration signal sampling points with the amplitude larger than a set threshold value continuously appears exceeds a set number, starting a judgment step of judging whether the breaker is displaced.
Still further, the judging step includes: tracing the circuit breaker vibration signal data in a set time period from the moment when the number of the circuit breaker vibration signal sampling points with the amplitude larger than the set threshold value continuously appears exceeds the set number, positioning the appearance moment of the first sampling point with the amplitude larger than the set threshold value as the initial point of the vibration signal, monitoring the collected circuit breaker vibration signal from the initial point, if typical bad signals exist in the circuit breaker vibration signal data, regarding the collected circuit breaker vibration signal as invalid, re-collecting the circuit breaker vibration signal until no typical bad signals exist, and if the number of the circuit breaker vibration signal sampling points with the amplitude larger than the set threshold value continuously appear in the obtained circuit breaker vibration signal data without the typical bad signals exceeds the set number, judging that the circuit breaker has displaced.
Further, a three-phase inconsistency identification criterion is established by using the three-phase electric field strength of the circuit breaker, and the three-phase inconsistency identification criterion is used for judging whether the three phases of the circuit breaker are successfully switched on, wherein the three-phase inconsistency identification criterion is expressed as follows:
wherein EA(t) is the electric field intensity of the A-phase measurement point, EB(t) field intensity at B-phase measurement point, Ec(T) is the electric field intensity of the C-phase measurement point, T1Is a threshold value of the difference of electric field intensity between the A-phase measurement point and the C-phase measurement point, T2Is a threshold value of the difference of electric field intensity between the A-phase measurement point and the B-phase measurement point, T3Is a threshold value of the difference of the electric field intensity between the C-phase measuring point and the B-phase measuring point, alpha1And gamma is a parameter of a set U-shaped curve of the electric field intensity, xmaxThe distance between the phase A measuring point and the phase B measuring point is obtained;
and if the three-phase inconsistency identification criteria are met, judging that the three-phase closing of the circuit breaker is successful, otherwise, judging that the three phases of the circuit breaker are inconsistent.
Further, the parameter γ is smaller than the parameter α1。
Further, after judging that the three phases of the circuit breaker are inconsistent, further judging the phase which is not successfully switched on, the method comprises the following steps:
if a set number of three-phase electric field intensity values appear in a set time, the following two criteria are not met, and | E is continuously met in the set timeA(t)-EB(t) | > M, judging that the three-phase switching-on of the circuit breaker is performed and the A phase is not switched on, wherein M is the A phase switching-on stateThe time-lapse AB phase electric field intensity difference threshold value,
if a set number of three-phase electric field intensity values appear in a set time, the following two criteria are not met, and | E is continuously met in the set timeC(t)-EB(t) | > M ', judging that the three phases of the circuit breaker are switched on and the C phase is not switched on, wherein M' is a BC phase electric field intensity difference threshold value when the C phase is not switched on,
if a set number of three-phase electric field intensity values appear in a set time, the following two criteria are not met, and | E is continuously met in the set timeA(t)-EB(t) | > M and | EC(t)-EB(t) | > M', judging that the three-phase of the breaker is switched on and the B phase is not switched on;
in another aspect, the present invention provides a device for identifying three-phase inconsistency of a circuit breaker, including: a circuit breaker deflection judging module and a three-phase inconsistency identifying module,
the circuit breaker displacement judging module is used for judging whether the circuit breaker is displaced according to the circuit breaker vibration signal;
and the three-phase inconsistency identification module is used for judging whether the three phases of the circuit breaker are successfully switched on or not by utilizing the three-phase electric field intensity signal of the circuit breaker if the circuit breaker is judged to be displaced.
8. The circuit breaker three-phase inconsistency recognition system of claim 7, wherein the three-phase inconsistency recognition module performs steps comprising:
and acquiring breaker vibration signals according to a set sampling frequency, and if the number of the breaker vibration signal sampling points with the amplitude larger than a set threshold value continuously appears exceeds a set number, starting a judgment step of judging whether the breaker is displaced.
Further, the three-phase inconsistency recognition module comprises the following steps: tracing the circuit breaker vibration signal data in a set time period from the moment when the number of the circuit breaker vibration signal sampling points with the amplitude larger than the set threshold value continuously appears exceeds the set number, positioning the appearance moment of the first sampling point with the amplitude larger than the set threshold value as the initial point of the vibration signal, monitoring the collected circuit breaker vibration signal from the initial point, if typical bad signals exist in the circuit breaker vibration signal data, regarding the collected circuit breaker vibration signal as invalid, re-collecting the circuit breaker vibration signal until no typical bad signals exist, and if the number of the circuit breaker vibration signal sampling points with the amplitude larger than the set threshold value continuously appear in the obtained circuit breaker vibration signal data without the typical bad signals exceeds the set number, judging that the circuit breaker has displaced.
Further, the three-phase inconsistency recognition module comprises the following steps: the method comprises the following steps of constructing a three-phase inconsistency identification criterion by utilizing the three-phase electric field intensity of the circuit breaker, and judging whether the three phases of the circuit breaker are successfully switched on or not by utilizing the three-phase inconsistency identification criterion, wherein the three-phase inconsistency identification criterion is expressed as follows:
wherein EA(t) is the electric field intensity of the A-phase measurement point, EB(t) field intensity at B-phase measurement point, Ec(T) is the electric field intensity of the C-phase measurement point, T1Is a threshold value of the difference of electric field intensity between the A-phase measurement point and the C-phase measurement point, T2Is a threshold value of the difference of electric field intensity between the A-phase measurement point and the B-phase measurement point, T3Is a threshold value of the difference of the electric field intensity between the C-phase measuring point and the B-phase measuring point, alpha1And gamma is a parameter of a set U-shaped curve of the electric field intensity, xmaxThe distance between the phase A measuring point and the phase B measuring point is obtained;
and if the three-phase inconsistency identification criteria are met, judging that the three-phase closing of the circuit breaker is successful, otherwise, judging that the three phases of the circuit breaker are inconsistent.
The invention has the following beneficial technical effects: the invention is applied to the on-line monitoring and fault diagnosis of the circuit breaker, and the starting point of the invention is firstly to reliably identify the three-phase inconsistent state, and secondly to reduce the circuit correlation with the prior art to the maximum extent, and the invention does not introduce the auxiliary contact of the circuit breaker and monitor the position of the relay, and obtains other fault characteristic quantities in a non-contact way to realize the identification of the three-phase inconsistent state.
According to the invention, the data of typical bad signals are removed, and whether the circuit breaker is displaced or not is judged according to the reserved effective signals, so that the identification of three-phase inconsistency is more accurate.
Drawings
FIG. 1 is a schematic diagram of a three-phase inconsistent protection principle of a circuit breaker body;
FIG. 2 is a schematic diagram of three-phase inconsistent protection of microcomputer protection electric quantity;
FIG. 3 is a schematic view of an installation of an electric field strength measuring terminal;
fig. 4 is a flowchart of a method for identifying three-phase inconsistency of a circuit breaker according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples of the specification.
As shown in fig. 3, in consideration of the breaker online monitoring technology in the intelligent operation and detection of power transformation, a breaker vibration signal sensor 1 is installed for realizing the monitoring of mechanical faults of the breaker, a breaker electric field intensity measuring terminal 2 is installed for realizing the split-phase installation of faults of external insulation strands such as cracks of a porcelain sleeve of the breaker, the breaker vibration signal sensor 1 and the breaker electric field intensity measuring terminal are associated with each other through a wired communication line 7 or in-station wireless communication with a breaker online monitoring device in an intelligent IED cabinet 3, and a breaker three-phase inconsistency identification device is arranged in the intelligent IED cabinet 3. Wherein the circuit breaker is mounted on a circuit breaker cross beam 5 or in a circuit breaker mechanism box 8, the circuit breaker cross beam 5 being erected on a circuit breaker post 6. The breaker beam 5 is flat. The vibration signal sensor 1 is arranged on the breaker beam 5 and below the breaker arc-extinguishing chamber 4, or arranged near the breaker mechanism box 8, and the electric field strength measuring terminal 2 is arranged on the breaker beam 5 and below the breaker arc-extinguishing chamber 4.
Based on the vibration signal of the vibration signal sensor and the electric field intensity signal of the electric field intensity measuring terminal, the technical scheme adopted by the invention is as follows (as shown in figure 4): and judging the occurrence of the breaker deflection event by analyzing the vibration signal, and judging whether the breaker is in a three-phase inconsistent state or not by analyzing the corresponding electric field intensity signal.
The method comprises the following two steps:
(1) circuit breaker displacement discrimination method based on vibration signal amplitude
The following describes a method for determining the displacement of the breaker, taking a vibration sensor mounted on a breaker beam and having a sampling frequency of 50kHz as an example.
Because the vibration that the vibration sensor felt is minimum when the circuit breaker normally operated, continuously deposit the signal of gathering in a first-in first-out's queue, roll the data and cover constantly. When the breaker is switched on and off in operation or switched off and switched on in a fault, the vibration amplitude sensed by the vibration sensor is far greater than the vibration amplitude of the breaker when the breaker is not switched on and off, and once 5 measured values with large continuous amplitudes appear, the breaker is preliminarily judged to have shifted, a vibration signal record is formed, and a judgment step of starting whether the breaker shifts or not is started.
Immediately tracing back the signal data stored in the queue within 20ms before the instant, (1000 data points) and locating the first large amplitude occurrence instant as the initial point t of the vibration signal0。
When t is0After the time is determined, data collection is continued, and whether typical bad signals (the typical bad signals comprise single-point numerical value abnormal signals or multi-point arrangement abnormal signals) exist in the monitoring data or not is further dynamically detected. If the typical bad signal exists, the sampling value is considered invalid, and the vibration signal is collected again until the typical bad signal does not exist. And if the number of the continuous circuit breaker vibration signal sampling points with the amplitude larger than the set threshold value in the obtained circuit breaker vibration signal data without the typical bad signals exceeds the set number, judging that the circuit breaker is displaced. According to the invention, the data of typical bad signals are removed, and whether the circuit breaker is displaced or not is judged according to the reserved effective signals, so that the identification of three-phase inconsistency is more accurate.
(2) Method for identifying three-phase electric field intensity difference of circuit breaker
As mentioned above, the electric field strength measurement terminals are respectively installed on three phases of the circuit breaker ABC, electric field signals are dynamically collected at ordinary times, and the sampling frequency is 1kHz (considering that the vibration sensor and the electric field strength measurement terminal have respective monitoring purposes and purposes, the difference of the sampling frequencies is a normal phenomenon, the method is carried out on the basis of adjusting the sampling frequencies of the vibration sensor and the electric field strength measurement terminal without adding extra investment). The following description will be given taking an example in which the breaker is closed in three phases and the phase a is not closed.
The measured data of the electric field intensity is also continuously stored in a first-in first-out queue, and the data is continuously covered in a rolling way. After the vibration sensor judges that the breaker is displaced, a three-phase inconsistency recognition mechanism of the breaker is triggered, and signal data (20 data points) stored in a queue within 20ms before the moment are immediately traced and continuously recorded for 3 seconds (the recording length is considered according to the action time of three-phase inconsistency protection).
Generally, in the operating state of the circuit breaker, the ABC three-phase electric field intensity of the installation position of the measuring terminal shows a rule that the AC phase is higher and the B phase is lower, namely a so-called U-shaped curve. The electric field intensity values of the three measurement points and the parabolic U-shaped curve are explained below;
taking a U-shaped curve of the B-phase electric field intensity value as an example, the three-phase electric field intensity value U-shaped curve defines xThe axis is the distance from the B-phase measuring point of the breaker, the y-axis is the electric field intensity value of the B-phase measuring point of the breaker, and the t moment is a continuous function g (x, t) taking the perpendicular line of the position of the B-phase measuring point of the breaker as a symmetry axis, wherein the function consists of two half branches which are respectively composed of a continuous conductible function g1(x，t)、g2(x, t) and the two half-branches are conjugated to one at x-0 as defined in R × R+A continuous function of (a);
for a parabolic three-phase electric field intensity value U-shaped curve, g1(x，t)、g2(x, t) are respectively:
wherein x is the distance between other measuring points and the B-phase measuring point; in normal state, gamma is generally smaller than alpha1The parameter alpha of the U-shaped curve of the electric field strength near the circuit breaker in the current operation state can be estimated according to the empirical data of the circuit breaker1And gamma, preferably alpha1Is 5 to 8 times gamma.
Generally, three electric field intensity measuring terminals are arranged at measuring points below the porcelain columns of the A phase, the B phase and the C phase, so that the electric field intensity E of the measuring points of the A phase and the C phase at the momentA(t)、Ec(t) is:
wherein x ismaxThe distance between the phase A measuring point and the phase B measuring point is shown.
It is easy to know that if the three-phase closing is successful, the following identification criterion for the three-phase inconsistency of the circuit breaker should be applied:
wherein, T1，T2，T3Respectively, the electric field strength difference threshold between different phase measurement points. In the example, assume phase AIf the switch-on is not successful, the first two criteria of the above formula will not be satisfied, and general rule EA(t) will be lower than EB(t)。
Considering that the electric field measurement values themselves are susceptible to interference, a more conservative identification procedure is employed here. The first two criteria are not satisfied as they occur more than 10 times within the first 20ms (20 group 3-phase data comparison), and | E is satisfied continuously from 20ms to 30msA(t)-EBIf the (t) | > M is greater, the three-phase closing of the breaker is judged, and the phase A is not closed.
If a set number of three-phase electric field intensity values appear in a set time, the following two criteria are not met, and | E is continuously met in the set timeC(t)-EB(t) | > M ', judging that the three phases of the circuit breaker are switched on and the C phase is not switched on, wherein M' is a BC phase electric field intensity difference threshold value when the C phase is not switched on,
if a set number of three-phase electric field intensity values appear in a set time, the following two criteria are not met, and | E is continuously met in the set timeA(t)-EB(t) | > M and | EC(t)-EB(t) | > M', judging that the three-phase of the breaker is switched on and the B phase is not switched on;
in view of the limitation of the current three-phase inconsistent state identification method in the practical application of intelligent operation and inspection, the invention provides the three-phase inconsistent identification method of the circuit breaker based on the vibration signal and the electric field intensity information on the premise of carrying out non-invasive monitoring on physical quantities such as vibration, electric field intensity and the like without changing the original operation loop of the circuit breaker. It should be noted that this method also does not rely on breaker auxiliary contact access and position relay reliability.
Corresponding to the method for identifying the three-phase inconsistency of the circuit breaker provided by the above embodiment, the specific embodiment of the present invention further provides a device for identifying the three-phase inconsistency of the circuit breaker, including: a circuit breaker deflection judging module and a three-phase inconsistency identifying module,
the circuit breaker displacement judging module is used for judging whether the circuit breaker is displaced according to the circuit breaker vibration signal;
and the three-phase inconsistency identification module is used for judging whether the three phases of the circuit breaker are successfully switched on or not by utilizing the three-phase electric field intensity signal of the circuit breaker if the circuit breaker is judged to be displaced.
Further, the three-phase inconsistency recognition module comprises the following steps:
and acquiring breaker vibration signals according to a set sampling frequency, and if the number of the breaker vibration signal sampling points with the amplitude larger than a set threshold value continuously appears exceeds a set number, starting a judgment step of judging whether the breaker is displaced.
Further, the three-phase inconsistency recognition module comprises the following steps: tracing the circuit breaker vibration signal data in a set time period from the moment when the number of the circuit breaker vibration signal sampling points with the amplitude larger than the set threshold value continuously appears exceeds the set number, positioning the appearance moment of the first sampling point with the amplitude larger than the set threshold value as the initial point of the vibration signal, monitoring the collected circuit breaker vibration signal from the initial point, if typical bad signals exist in the circuit breaker vibration signal data, regarding the collected circuit breaker vibration signal as invalid, re-collecting the circuit breaker vibration signal until no typical bad signals exist, and if the number of the circuit breaker vibration signal sampling points with the amplitude larger than the set threshold value continuously appear in the obtained circuit breaker vibration signal data without the typical bad signals exceeds the set number, judging that the circuit breaker has displaced.
Further, the three-phase inconsistency recognition module comprises the following steps:
the method comprises the following steps of constructing a three-phase inconsistency identification criterion by utilizing the three-phase electric field intensity of the circuit breaker, and judging whether the three phases of the circuit breaker are successfully switched on or not by utilizing the three-phase inconsistency identification criterion, wherein the three-phase inconsistency identification criterion is expressed as follows:
wherein EA(t) is the electric field intensity of the A-phase measurement point, EB(t) field intensity at B-phase measurement point, Ec(T) is the electric field intensity of the C-phase measurement point, T1Is a threshold value of the difference of electric field intensity between the A-phase measurement point and the C-phase measurement point, T2Is a threshold value of the difference of electric field intensity between the A-phase measurement point and the B-phase measurement point, T3Is a threshold value of the difference of the electric field intensity between the C-phase measuring point and the B-phase measuring point, alpha1And gamma is a parameter of a set U-shaped curve of the electric field intensity, xmaxThe distance between the phase A measuring point and the phase B measuring point is obtained;
and if the three-phase inconsistency identification criteria are met, judging that the three-phase closing of the circuit breaker is successful, otherwise, judging that the three phases of the circuit breaker are inconsistent.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the apparatus, and the module described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The method and the system for identifying the three-phase inconsistency are completely based on a non-invasive monitoring means, and can be conveniently and directly applied to fault diagnosis of the breaker of the transformer substation. Promising applications include:
1) the method is provided for a circuit breaker fault diagnosis system, external three-phase inconsistent information is obtained while the vibration signal of the circuit breaker is analyzed, and accurate diagnosis of the mechanical fault of the circuit breaker is realized;
2) the three-phase inconsistent information is provided for a circuit breaker fault diagnosis system, and the consistency of the action time of each phase of the circuit breaker is evaluated according to the three-phase inconsistent information;
3) the intelligent operation and inspection background is provided with the three-phase inconsistency warning information of the circuit breaker. It should be noted that this function is not a repetition of the three-phase inconsistency protection alarm signal. If the protection electric quantity three-phase inconsistent protection is influenced by the locking logic, the protection electric quantity three-phase inconsistent protection cannot operate under low load and cannot give an alarm. The test and simulation results show that the electric field intensity difference measured by the method under the low-load working condition is enough to distinguish whether the three-phase inconsistency occurs in the circuit breaker, so that the alarm can be given in time, and the emergency disposal of operation and maintenance personnel is facilitated.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The identification method for the three-phase inconsistency of the circuit breaker is characterized by comprising the following steps:
collecting a breaker vibration signal and a three-phase electric field strength signal, and judging whether the breaker is displaced or not according to the breaker vibration signal;
and if the circuit breaker is judged to be displaced, judging whether the three phases of the circuit breaker are successfully switched on or not by utilizing the three-phase electric field intensity signal of the circuit breaker.
2. The method for identifying the three-phase inconsistency of the circuit breaker according to claim 1, wherein the step of judging whether the circuit breaker is displaced according to a vibration signal of the circuit breaker comprises the following steps: and acquiring breaker vibration signals according to a set sampling frequency, and if the number of the breaker vibration signal sampling points with the amplitude larger than a set threshold value continuously appears exceeds a set number, starting a judgment step of judging whether the breaker is displaced.
3. The method for identifying three-phase inconsistency of circuit breaker according to claim 2, wherein the determining step comprises: tracing the circuit breaker vibration signal data in a set time period from the moment when the number of the circuit breaker vibration signal sampling points with the amplitude larger than the set threshold value continuously appears exceeds the set number, positioning the appearance moment of the first sampling point with the amplitude larger than the set threshold value as the initial point of the vibration signal, monitoring the collected circuit breaker vibration signal from the initial point, if typical bad signals exist in the circuit breaker vibration signal data, regarding the collected circuit breaker vibration signal as invalid, re-collecting the circuit breaker vibration signal until no typical bad signals exist, and if the number of the circuit breaker vibration signal sampling points with the amplitude larger than the set threshold value continuously appear in the obtained circuit breaker vibration signal data without the typical bad signals exceeds the set number, judging that the circuit breaker has displaced.
4. The method for identifying the three-phase inconsistency of the circuit breaker according to claim 1, wherein a three-phase inconsistency identification criterion is established by using the three-phase electric field intensity of the circuit breaker, and the three-phase inconsistency identification criterion is used for judging whether the three phases of the circuit breaker are successfully switched on, wherein the three-phase inconsistency identification criterion is expressed as follows:
wherein EA(t) is the electric field intensity of the A-phase measurement point, EB(t) field intensity at B-phase measurement point, Ec(T) is the electric field intensity of the C-phase measurement point, T1Is a threshold value of the difference of electric field intensity between the A-phase measurement point and the C-phase measurement point, T2Is a threshold value of the difference of electric field intensity between the A-phase measurement point and the B-phase measurement point, T3Is a threshold value of the difference of the electric field intensity between the C-phase measuring point and the B-phase measuring point, alpha1And gamma is a parameter of a set U-shaped curve of the electric field intensity, xmaxThe distance between the phase A measuring point and the phase B measuring point is obtained;
and if the three-phase inconsistency identification criteria are met, judging that the three-phase closing of the circuit breaker is successful, otherwise, judging that the three phases of the circuit breaker are inconsistent.
5. The method for identifying three-phase inconsistency of circuit breaker according to claim 1, wherein the parameter γ is smaller than the parameter α1。
6. The method for identifying the three-phase inconsistency of the circuit breaker according to claim 1, further determining the phase which is not successfully switched on after determining the three-phase inconsistency of the circuit breaker, comprising:
if a set number of three-phase electric field intensity values appear in a set time, the following two criteria are not met, and | E is continuously met in the set timeA(t)-EB(t) | > M, judging that the three-phase closing of the circuit breaker is performed and the A phase is not closed, wherein M is the AB phase electric field intensity difference threshold value when the A phase is not closed,
if a set number of three-phase electric field intensity values appear in a set time, the following two criteria are not met, and | E is continuously met in the set timeC(t)-EB(t) | > M ', judging that the three phases of the circuit breaker are switched on and the C phase is not switched on, wherein M' is a BC phase electric field intensity difference threshold value when the C phase is not switched on,
if a set number of three-phase electric field intensity values appear in a set time, the following two criteria are not met, and | E is continuously met in the set timeA(t)-EB(t) | > M and | EC(t)-EB(t) | > M', judging that the three-phase of the breaker is switched on and the B phase is not switched on;
7. inconsistent recognition device of circuit breaker three-phase, its characterized in that includes: a circuit breaker deflection judging module and a three-phase inconsistency identifying module,
the circuit breaker displacement judging module is used for judging whether the circuit breaker is displaced according to the circuit breaker vibration signal;
and the three-phase inconsistency identification module is used for judging whether the three phases of the circuit breaker are successfully switched on or not by utilizing the three-phase electric field intensity signal of the circuit breaker if the circuit breaker is judged to be displaced.
8. The circuit breaker three-phase inconsistency recognition system of claim 7, wherein the three-phase inconsistency recognition module performs steps comprising:
and acquiring breaker vibration signals according to a set sampling frequency, and if the number of the breaker vibration signal sampling points with the amplitude larger than a set threshold value continuously appears exceeds a set number, starting a judgment step of judging whether the breaker is displaced.
9. The apparatus for identifying three-phase inconsistency of circuit breaker according to claim 8, wherein the three-phase inconsistency identifying module performs the steps comprising: tracing the circuit breaker vibration signal data in a set time period from the moment when the number of the circuit breaker vibration signal sampling points with the amplitude larger than the set threshold value continuously appears exceeds the set number, positioning the appearance moment of the first sampling point with the amplitude larger than the set threshold value as the initial point of the vibration signal, monitoring the collected circuit breaker vibration signal from the initial point, if typical bad signals exist in the circuit breaker vibration signal data, regarding the collected circuit breaker vibration signal as invalid, re-collecting the circuit breaker vibration signal until no typical bad signals exist, and if the number of the circuit breaker vibration signal sampling points with the amplitude larger than the set threshold value continuously appear in the obtained circuit breaker vibration signal data without the typical bad signals exceeds the set number, judging that the circuit breaker has displaced.
10. The apparatus for identifying three-phase inconsistency of circuit breaker according to claim 7, wherein the three-phase inconsistency identifying module performs the steps comprising:
the method comprises the following steps of constructing a three-phase inconsistency identification criterion by utilizing the three-phase electric field intensity of the circuit breaker, and judging whether the three phases of the circuit breaker are successfully switched on or not by utilizing the three-phase inconsistency identification criterion, wherein the three-phase inconsistency identification criterion is expressed as follows:
wherein EA(t) is the electric field intensity of the A-phase measurement point, EB(t) field intensity at B-phase measurement point, Ec(T) is the electric field intensity of the C-phase measurement point, T1Is a threshold value of the difference of electric field intensity between the A-phase measurement point and the C-phase measurement point, T2Is a threshold value of the difference of electric field intensity between the A-phase measurement point and the B-phase measurement point, T3Is a threshold value of the difference of the electric field intensity between the C-phase measuring point and the B-phase measuring point, alpha1And gamma is a parameter of a set U-shaped curve of the electric field intensity, xmaxThe distance between the phase A measuring point and the phase B measuring point is obtained;
and if the three-phase inconsistency identification criteria are met, judging that the three-phase closing of the circuit breaker is successful, otherwise, judging that the three phases of the circuit breaker are inconsistent.
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