CN117590211A - Method, medium and system for determining pre-breakdown time of alternating current filter bank circuit breaker - Google Patents
Method, medium and system for determining pre-breakdown time of alternating current filter bank circuit breaker Download PDFInfo
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- 238000012546 transfer Methods 0.000 claims abstract description 22
- 238000004088 simulation Methods 0.000 claims abstract description 16
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
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Abstract
The invention discloses a method, medium and system for determining pre-breakdown time of an alternating current filter bank breaker, comprising the following steps: sequentially performing a simulated ablation experiment and a pre-breakdown experiment on the circuit breaker to obtain a first corresponding relation between accumulated transferred charge quantity generated in the action process of the circuit breaker in the simulated ablation experiment and pre-breakdown time of the circuit breaker in the pre-breakdown experiment; obtaining a second corresponding relation of a switching-on phase angle and a transfer charge quantity corresponding to the switching-on surge current through switching-on surge current simulation of the alternating current filter; based on the second corresponding relation, the accumulated transfer charge quantity of the actual breaker in the process from the first closing to the current last closing is obtained through the recording data of each breaker closing; based on the first corresponding relation, acquiring the pre-breakdown time corresponding to the accumulated transferred charge quantity in the process from the first closing to the current last closing of the actual breaker. The invention can realize the on-line monitoring of the pre-breakdown time and provides a reliable basis for the selection of the control parameters of the phase-selecting switch-on.
Description
Technical Field
The invention relates to the technical field of safety of alternating current filter bank circuit breakers, in particular to a method, medium and system for determining pre-breakdown time of an alternating current filter bank circuit breaker.
Background
The circuit breaker for the filter bank needs to complete the investment and the cutting work of the filter bank. ACF (AC Filter) circuit breakers not only need to meet the capability of opening and closing a large short circuit current, but also need to withstand high amplitude high frequency inrush currents during closing as compared to other circuit breakers. Therefore, in the operation process of the ACF circuit breaker, frequent closing inrush current and mechanical abrasion can ablate an arc contact, a nozzle and the like in an arc extinguishing chamber of the circuit breaker, so that the closing pre-breakdown time is changed, and the closing pre-breakdown time can reflect the electric life of the circuit breaker to a certain extent. The switching-on actions of the circuit breaker for the filter in the convertor station are controlled by adopting a phase-selecting switching-on device, and the control effect of phase-selecting switching-on is not only influenced by the self-dispersion of the switching-on action time of the circuit breaker, but also greatly influenced by the pre-breakdown time.
The existing pre-breakdown time detection method generally carries out off-line detection during the power failure of the filter, and cannot accurately obtain the pre-breakdown time of the current breaker, so that the control parameter selection of the phase selection switching-on device is affected. The online monitoring method of the pre-breakdown time has the defects of low reliability, complex operation and easy external interference. The current of each phase of the filter can be obtained by the recording data acquisition device, and the time of occurrence of the pre-breakdown can be judged only by the current and voltage waveforms, so that the duration of the pre-breakdown process can not be obtained, and therefore, the relevance between the recording data and the pre-breakdown time is required to be studied, and the on-line accurate judgment of the pre-breakdown time is realized.
Disclosure of Invention
The embodiment of the invention provides a method, medium and system for determining the pre-breakdown time of an alternating current filter bank breaker, which are used for solving the problems of low reliability, complex operation and easy external interference existing in the online monitoring method of the pre-breakdown time in the prior art.
In a first aspect, a method for determining a pre-breakdown time of an ac filter bank circuit breaker is provided, including:
sequentially performing a simulated ablation experiment and a pre-breakdown experiment on the circuit breaker to obtain a first corresponding relation between accumulated transferred charge quantity generated in the action process of the circuit breaker in the simulated ablation experiment and pre-breakdown time of the circuit breaker in the pre-breakdown experiment;
obtaining a second corresponding relation of a switching-on phase angle and a transfer charge quantity corresponding to the switching-on surge current through switching-on surge current simulation of the alternating current filter;
based on the second corresponding relation, the accumulated transfer charge quantity of the actual breaker in the process from the first closing to the current last closing is obtained through the recording data of each breaker closing;
based on the first corresponding relation, acquiring the pre-breakdown time corresponding to the accumulated transferred charge quantity in the process from the first closing to the current last closing of the actual breaker.
In a second aspect, there is provided a computer readable storage medium having computer program instructions stored thereon; the computer program instructions, when executed by a processor, implement a method for determining a pre-break-down time of an ac filter bank circuit breaker as described in an embodiment of the first aspect.
In a third aspect, there is provided an ac filter bank circuit breaker pre-breakdown time determination system comprising: the computer readable storage medium as in the second aspect embodiment.
In this way, the embodiment of the invention combines the relation between the pre-breakdown time and the transferred charge amount obtained by the current existing wave recording acquisition technology, obtains the corresponding relation between the switching-on phase angle and the transferred charge amount by simulation calculation, determines the switching-on phase angle by the current acquired and recorded wave recording data of the converter station, determines the pre-breakdown time of the current breaker, realizes the on-line monitoring of the pre-breakdown time, provides a reliable basis for the control parameter selection of the phase-selecting switching-on, and improves the control effect of the phase-selecting switching-on.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for determining a pre-breakdown time of an ac filter bank circuit breaker according to an embodiment of the present invention;
FIG. 2 is a diagram of upper and lower integral limits of the amount of transferred charge according to an embodiment of the present invention;
FIG. 3 is a graph showing the relationship between the pre-breakdown time and the transferred charge amount according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an AC filter closing inrush current simulation calculation model according to an embodiment of the present invention;
FIG. 5 is a simulated waveform diagram corresponding to different closing phase angles according to an embodiment of the present invention;
fig. 6 is a schematic diagram of recording data according to an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention discloses a method for determining the pre-breakdown time of an alternating current filter bank breaker. As shown in fig. 1, the method of the embodiment of the invention includes the following steps:
step S101: and sequentially performing an analog ablation experiment and a pre-breakdown experiment on the circuit breaker to obtain a first corresponding relation between the accumulated transferred charge quantity generated in the action process of the circuit breaker in the analog ablation experiment and the pre-breakdown time of the circuit breaker in the pre-breakdown experiment.
The simulated ablation experiment is to simulate the ablation of the arc extinguishing chamber of the circuit breaker in the actual operation process, and to count the transferred charge quantity in the simulated ablation experiment, wherein the transferred charge quantity is the current integral value of the arc stage in the circuit breaker ablation process. Specifically, when the simulated ablation experiment is carried out on the circuit breaker, current signals and voltage signals in the simulated ablation experiment are collected, and the transferred charge quantity in the process of the simulated ablation experiment is calculated through the current signals. The accumulated transferred charge amount is obtained by adding the transferred charge amounts in each experiment of the circuit breaker, and the calculated formula of the accumulated transferred charge amount is shown as follows:
wherein Q is sum Represents the accumulated transferred charge amount, Q n The amount of transferred charge in the nth simulated ablation experiment of the circuit breaker is shown, and N is the total number of simulated ablation experiments of the circuit breaker.
The calculation method of the transferred charge quantity in each ablation experiment is to integrate the current in the arcing stage of the circuit breaker, and the specific calculation formula is as follows:
where i (t) represents the current at time t, i.e., the current waveform indicated by reference numeral 1 in fig. 2.
Wherein t is 1 Indicating the start time, t, of the arcing phase 2 Indicating the moment of the current zero crossing.
In an ablation experiment, a high-voltage probe is connected into a high-voltage end and a grounding end of a circuit breaker to be used for monitoring the ground potential, a Rogowski coil is connected in series in an ablation loop to be used for recording loop current, an arc voltage drop is obtained by making a difference between the high-voltage end potential and the grounding end potential, and the arc voltage value is increased by judging the data change of the arc voltage dropThe corresponding moment is the starting moment t of the arcing stage 1 By judging the loop current waveform, the moment of current zero crossing is the moment t corresponding to arc extinction 2 。
The determination of the upper and lower limits of the integration can be determined by the voltage waveform indicated by reference numeral 2 in fig. 2. Specifically, the lower limit is integrated—the starting time t of the arcing phase 1 I.e. the moment corresponding to the abrupt rise of the arc-drop, corresponds to the moment indicated by reference numeral 3 in fig. 2. Wherein, the "abrupt rise" herein means that: the arc voltage drop rises from a zero value to a value such that the slope of the curve of the arc voltage drop over time for the value is greater than tan45 deg., and thereafter the value of the arc voltage drop does not drop to zero within 1 ms. Specifically, the upper limit of integration-the time t of the current zero crossing 2 I.e. the moment of arc extinction, corresponds to the moment indicated by reference numeral 4 in fig. 2.
And integrating the acquired current data to obtain the transferred charge quantity in the action process of the circuit breaker.
Specifically, the pre-breakdown time is obtained by:
the test of the pre-breakdown time is that high voltage is applied to two ends of the circuit breaker, the circuit breaker is controlled to conduct closing action, vibration signals and electromagnetic field signals in the closing process are collected, when the collected electromagnetic field signals are suddenly changed, the corresponding time at the moment is recorded, and the time at the moment is the starting time of closing pre-breakdown. As used herein, "mutation" refers to: the acquired electromagnetic field signal changes from zero to an amplitude greater than 4V, and the corresponding time is recorded at the moment, namely the starting time of the closing pre-breakdown. Specifically, by placing an electromagnetic field antenna near the circuit breaker, surrounding electromagnetic field signals are collected.
Vibration signals in the closing process are collected by installing the vibration sensor on an operating mechanism of the circuit breaker. The time corresponding to the contact rigid point can be extracted from the vibration signal. Specifically, the extraction process comprises:
the moment corresponding to the overshoot point can only be directly extracted from the vibration signal (the extraction process is a well-known technology in the field, and is not repeated here), the displacement corresponding to the overshoot point from the rigid point of the contact is unchanged, the instability of the closing speed is ignored, and the time difference from the rigid point of the contact to the overshoot point is unchanged, so that the moment corresponding to the rigid point can be obtained by obtaining the time difference and subtracting the time difference T0 from the moment corresponding to the overshoot point.
The time difference T0 is obtained by: before starting a switching-on pre-breakdown experiment, applying a direct current voltage at two ends of a breaker break, wherein the amplitude of the direct current voltage is about tens of volts, so that the breaker performs switching-on action, and recording the moment when a voltage signal changes from the maximum value to 0, wherein the moment is the moment corresponding to the current switching-on rigid point. The time difference T0 is obtained by subtracting the time from the overshoot point of the vibration signal. Then, the time difference T0 is directly subtracted from the corresponding moment of the overshoot point in the vibration signal without obtaining the time difference T0, and the moment of the rigid point is the moment of the rigid point.
Subtracting the initial time of the pre-breakdown from the time corresponding to the rigid point of the contact to obtain the pre-breakdown time, which is recorded as T pre . In general, in order to improve accuracy, after performing a simulated ablation experiment, a pre-breakdown time test is performed, 5 times of tests are performed, and an average value is taken to reduce an experimental error, so as to obtain a pre-breakdown time.
The accumulated transferred charge amount and the pre-breakdown time are in one-to-one correspondence, and a first correspondence relationship shown in fig. 3 is obtained. The first correspondence is obtained experimentally.
Step S102: and obtaining a second corresponding relation of the switching-on phase angle and the transfer charge quantity corresponding to the switching-on surge current by carrying out switching-on surge current simulation on the alternating current filter.
Specifically, the method comprises the following steps:
1. and establishing an alternating current filter closing surge simulation calculation model considering the spurious parameters.
In consideration of the fact that the simulation calculation model reflects actual conditions as truly as possible, the simulation calculation model needs to be established based on arrangement conditions and element parameters of an alternating current filter field in a converter station of the extra-high voltage direct current transmission project. In one embodiment of the present invention, the simulation calculation model is an electromagnetic transient calculation model, as shown in fig. 4. This step is a conventional technical means, and can be performed in ATP-EMTP software, and will not be described here.
2. And adopting an alternating current filter switching-on surge current simulation calculation model to calculate and obtain switching-on surge currents corresponding to different switching-on times.
Specifically, the circuit breaker is switched on when the bus voltage crosses the zero point, so the time of the bus voltage crossing the zero point is taken as reference switching time, the switching time is the difference between the current time and the reference switching time, and is recorded as deltat i . Adopting an alternating current filter switching-on surge current simulation calculation model to calculate different switching-on time delta t i The corresponding closing surge current is obtained along with closing time delta t i A varying closing surge waveform.
3. And calculating the closing phase angles corresponding to different closing times.
Different closing times deltat i Corresponding closing phase angle theta i The calculation formula of (2) is as follows:
θ i ＝wΔt i 。
wherein w represents the angular velocity of the busbar voltage in rad/s. θ i 0-180 deg. and calculating with each 1 deg. step.
4. And based on the closing phase angles corresponding to the different closing times, the different closing phase angles are corresponding to the closing inrush current.
The switching-on time corresponds to the switching-on phase angle through statistical analysis, and then different switching-on phase angles theta can be obtained according to the switching-on inrush current corresponding to the switching-on time i The corresponding closing surge current is shown in fig. 5.
5. And integrating the switching-on current corresponding to the different switching-on phase angles, and calculating to obtain the transfer charge quantity corresponding to the switching-on current corresponding to the different switching-on phase angles.
Specifically, the step integrates the current based on the switching-on surge current waveforms corresponding to different switching-on phase angles to obtain the electric charge amounts corresponding to the different switching-on phase angles. I.e. when the closing phase angle is theta i At the corresponding time difference of Deltat i The transfer charge quantity corresponding to the switching-on surge waveform is Q i The integral formula is as follows:
wherein Q is i Representing the closing phase angle theta i The corresponding transfer charge quantity of the corresponding switching-on surge current, t 3 Indicating the moment when the switching-on inrush current starts from zero, t 4 The moment corresponding to the switching-on surge phase to the normal current phase is indicated.
6. And establishing a second corresponding relation of the switching-on phase angle and the transfer charge quantity corresponding to the switching-on surge current.
Step S103: based on the second corresponding relation, the accumulated transferred charge quantity of the actual breaker in the process from the first closing to the current last closing is obtained through the recording data of the closing of the breaker each time.
Specifically, the method comprises the following steps:
1. and respectively determining the moment when the current suddenly changes from zero and the moment when the voltage crosses zero in a certain phase of current waveform and bus voltage waveform extracted from the wave recording data after the circuit breaker is switched on for the first time.
Recording the recording data after the circuit breaker is switched on, and extracting certain phase current data and bus voltage data. The "moment at which the current starts to suddenly change from zero" as referred to herein means: the current is always zero within 5ms before the moment when the current starts to suddenly change from zero, and the current rises to a maximum value after the moment when the current starts to suddenly change from zero.
2. And calculating the difference between the moment when the current starts to suddenly change from zero and the moment when the voltage crosses the zero, and obtaining the time difference.
The difference between the instant when the current suddenly changes from zero and the instant when the voltage crosses zero is calculated and noted as the time difference Δt. This time difference is shown as the time interval indicated by reference 5 in fig. 6.
3. And calculating the phase angle difference of a certain phase current and the bus voltage in the wave recording data according to the time difference and the angular speed of the bus voltage.
Specifically, the calculation formula of the phase angle difference between a certain phase current and a bus voltage in the wave recording data comprises:
θ＝wΔt。
where θ represents a phase angle difference between a certain phase current and a bus voltage in the recorded data, w represents an angular velocity of the bus voltage, and Δt represents a time difference.
4. And obtaining the transfer charge quantity corresponding to the phase angle difference of each closing of the actual breaker based on the second corresponding relation.
Closing phase angle theta obtained based on simulation calculation of step S102 i And charge quantity Q i And obtaining a transfer charge quantity corresponding to the phase angle difference theta in the switching-on process.
5. And calculating the sum of transfer charge amounts corresponding to the phase angle difference of each closing to obtain the accumulated transfer charge amount of the actual breaker in the process from the first closing to the current completion of the last closing.
And recording and counting the transfer charge quantity obtained from the recording data in each closing process, and obtaining the accumulated transfer charge quantity of the circuit breaker from the first closing to the current final closing completion process through addition calculation.
Step S104: based on the first corresponding relation, the pre-breakdown time corresponding to the accumulated transferred charge quantity in the process from the first closing to the current last closing of the actual breaker is obtained.
Pre-breakdown time T established experimentally according to step S101 pre And Q of accumulated transferred charge quantity sum The first corresponding relation of the circuit breaker is obtained, and the pre-breakdown time corresponding to the accumulated transferred charge quantity of the circuit breaker action is obtained, so that the judgment of the pre-breakdown time is realized, and reliable basis is provided for phase selection closing, electric life evaluation and the like.
In addition, the embodiment of the invention also provides a computer readable storage medium, and the computer readable storage medium is stored with computer program instructions; the computer program instructions, when executed by a processor, implement the method for determining the pre-breakdown time of an ac filter bank circuit breaker as described in the above embodiments.
In addition, the embodiment of the invention also provides a system for determining the pre-breakdown time of the alternating current filter bank breaker, which comprises the following steps: the computer-readable storage medium as in the above embodiments.
In summary, according to the embodiment of the invention, through the current existing wave recording acquisition technology and the relation between the pre-breakdown time and the transferred charge amount obtained through experiments, the corresponding relation between the switching-on phase angle and the transferred charge amount is obtained through simulation calculation, the switching-on phase angle is determined through the current acquired and recorded wave recording data of the converter station, the pre-breakdown time of the current breaker is determined, the on-line monitoring of the pre-breakdown time is realized, a reliable basis is provided for the selection of control parameters of phase selection switching-on, and the control effect of the phase selection switching-on is improved.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (8)
1. A method for determining a pre-breakdown time of an ac filter bank circuit breaker, comprising:
sequentially performing a simulated ablation experiment and a pre-breakdown experiment on the circuit breaker to obtain a first corresponding relation between accumulated transferred charge quantity generated in the action process of the circuit breaker in the simulated ablation experiment and pre-breakdown time of the circuit breaker in the pre-breakdown experiment;
obtaining a second corresponding relation of a switching-on phase angle and a transfer charge quantity corresponding to the switching-on surge current through switching-on surge current simulation of the alternating current filter;
based on the second corresponding relation, the accumulated transfer charge quantity of the actual breaker in the process from the first closing to the current last closing is obtained through the recording data of each breaker closing;
based on the first corresponding relation, acquiring the pre-breakdown time corresponding to the accumulated transferred charge quantity in the process from the first closing to the current last closing of the actual breaker.
2. The method for determining the pre-breakdown time of an ac filter bank circuit breaker according to claim 1, wherein the step of obtaining the second correspondence of the switching-on phase angle and the transferred charge amount corresponding to the switching-on inrush current comprises:
establishing an alternating current filter closing surge simulation calculation model considering stray parameters;
adopting the switching-on surge simulation calculation model of the alternating current filter to calculate and obtain switching-on surge corresponding to different switching-on times;
calculating the corresponding closing phase angles of different closing times;
based on the closing phase angles corresponding to different closing times, the different closing phase angles are corresponding to the closing inrush current;
integrating the switching-on surge currents corresponding to different switching-on phase angles, and calculating to obtain transfer charge amounts corresponding to the switching-on surge currents corresponding to the different switching-on phase angles;
and establishing a second corresponding relation of the switching-on phase angle and the transfer charge quantity corresponding to the switching-on surge current.
3. The method for determining the pre-breakdown time of the ac filter bank circuit breaker according to claim 2, wherein the calculation formula of the closing phase angle corresponding to the closing time includes:
θ 0 ＝wΔt 0 ；
wherein θ 0 Indicating closing time Deltat 0 The corresponding closing phase angle, w, represents the angular velocity of the bus voltage.
4. The method for determining the pre-breakdown time of an ac filter bank circuit breaker according to claim 1, wherein the step of obtaining the accumulated transferred charge amount of the actual circuit breaker from the first closing to the completion of the last closing comprises:
the method comprises the steps of respectively determining the moment when current suddenly changes from zero and the moment when voltage crosses zero in a certain phase current waveform and a bus voltage waveform extracted from wave recording data after a circuit breaker is switched on for the first time;
calculating the difference between the moment when the current starts to suddenly change from zero and the moment when the voltage crosses the zero, so as to obtain a time difference;
according to the time difference and the angular speed of the bus voltage, calculating to obtain the phase angle difference of a certain phase current and the bus voltage in the wave recording data;
obtaining a transfer charge quantity corresponding to a phase angle difference of each closing of an actual breaker based on the second corresponding relation;
and calculating the sum of transfer charge amounts corresponding to the phase angle difference of each closing to obtain the accumulated transfer charge amount of the actual breaker in the process from the first closing to the current completion of the last closing.
5. The method for determining the pre-breakdown time of an ac filter bank circuit breaker according to claim 4, wherein the calculation formula of the phase angle difference between the current of a certain phase and the voltage of the bus in the wave recording data comprises:
θ＝wΔt；
where θ represents a phase angle difference between a certain phase current and a bus voltage in the recorded data, w represents an angular velocity of the bus voltage, and Δt represents a time difference.
6. The method of claim 1, wherein the calculation formula of the accumulated transferred charge amount generated during the breaker operation in the simulated ablation experiment comprises:
wherein Q is sum Represents the accumulated transferred charge amount, Q n Representing the transferred charge quantity in the nth simulated ablation experiment of the circuit breaker, wherein N represents the total number of simulated ablation experiments of the circuit breaker;
wherein,
wherein t is 1 Indicating the start time, t, of the arcing phase 2 The time when the current crosses zero is indicated, i (t) indicates the current at time t.
7. A computer-readable storage medium, characterized by: the computer readable storage medium has stored thereon computer program instructions; the computer program instructions, when executed by a processor, implement the alternating current filter bank circuit breaker pre-break time determination method as defined in any one of claims 1 to 6.
8. An ac filter bank circuit breaker pre-break down time determination system, comprising: the computer-readable storage medium of claim 7.
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| CN202311459396.1A CN117590211A (en) | 2023-11-03 | 2023-11-03 | Method, medium and system for determining pre-breakdown time of alternating current filter bank circuit breaker |
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| CN202311459396.1A CN117590211A (en) | 2023-11-03 | 2023-11-03 | Method, medium and system for determining pre-breakdown time of alternating current filter bank circuit breaker |
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