CN113515723B - Comprehensive evaluation method for minimum action voltage of circuit breaker - Google Patents
Comprehensive evaluation method for minimum action voltage of circuit breaker Download PDFInfo
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Abstract
The invention discloses a comprehensive evaluation method for the lowest action voltage of a circuit breaker, which comprises the steps of selecting opening and closing current-time curves of a plurality of voltages, dividing a plurality of curve intervals by using an extreme value method, calculating the thermal power consumption of the curve intervals, and fitting a thermal power consumption fitting curve of the same curve interval under different voltages to obtain a thermal power consumption-voltage standard curve; selecting actual thermal power consumption and standard thermal power consumption from a thermal power consumption-voltage standard curve, calculating the deviation of the heating power, and correcting the thermal power consumption-voltage standard curve by using a translation curve method; selecting the heat power consumption corresponding to the actual lowest action voltage in the standard curve, and selecting the correction voltage from the correction curve to obtain a lowest action voltage vector U; comprehensively obtaining an evaluation weight W by adopting an analytic hierarchy process, endowing the weight vector W to a vector U, and obtaining a corrected lowest action voltage
. The method and the device integrate the influence of thermal power consumption on the lowest action voltage in multiple stages of the electromagnet, comprehensively evaluate the lowest action voltage of the circuit breaker, and improve the accuracy of an evaluation result.
Description
Technical Field
The embodiment of the invention relates to the technical field of circuit breaker fault detection and diagnosis, in particular to a circuit breaker minimum action voltage comprehensive evaluation method.
Background
The circuit breaker is an important device in the power system, and the reliability of the circuit breaker is related to the operation stability of the whole power grid. With the rapid increase of the number of newly-put-into-operation circuit breakers in recent years, the current mode of state maintenance and periodical maintenance is difficult to meet the maintenance requirements of the existing circuit breakers, the main reason is that the workload of operation and maintenance personnel is huge, the requirement of small maintenance of the circuit breakers every year cannot be met, the situation that the circuit breakers are not in place sometimes exists, and the problem of excessive maintenance also exists at the same time.
The lowest action voltage is an important index for ensuring the reliable action of the circuit breaker, and is actually the control loop voltage of the operating mechanism, and the control loop voltage directly acts on the electromagnet of the operating mechanism of the circuit breaker. Because power grid equipment has a plurality of unstable factors, occasionally, tens of volts of interference voltage can appear, and the lowest action voltage is too low, the circuit breaker in operation has misoperation; the circuit breaker control circuit voltage is provided by stable direct current source in operation, if direct current source goes wrong, then can use the battery power supply to carry out circuit breaker divide-shut brake operation, and minimum operating voltage is too high can lead to the unable normal divide-shut brake of switch when the battery power supply to the accident appears. Therefore, in order to improve the operation reliability of the circuit breakers, each circuit breaker has the requirement of the lowest action voltage, although the current waveforms of switching-off and switching-on are similar, the characteristic waveform of the switching-off current can only evaluate the lowest action voltage of the switching-off, and the switching-off evaluation standard is that the lowest action voltage of the switching-off is greater than 30% of rated action voltage and less than 65% of rated action voltage; the characteristic waveform of the closing current can only be evaluated according to the minimum closing action voltage, and the closing evaluation standard is that the minimum closing action voltage is greater than 30% of the rated action voltage and less than 80% of the rated action voltage.
However, in the existing evaluation method, only the lowest action voltage of the circuit breaker can be tested when a routine overhaul test is carried out, and the change condition of the lowest action voltage cannot be evaluated in the charged state of the circuit breaker. And although there are cases of using the lowest operating voltage as an evaluation element, power failure detection is required, and the method cannot meet the current requirement of monitoring the health condition of the circuit breaker in real time. If the circuit breaker is differentiated, the action reliability of the circuit breaker is reduced, and the equipment in operation cannot predict the minimum action voltage, cannot accurately evaluate the operation risk of the circuit breaker and cannot monitor the operation risk in real time, so that a method for diagnosing the minimum action voltage reliability of the circuit breaker at any time is needed.
Disclosure of Invention
Therefore, the embodiment of the invention provides a comprehensive evaluation method for the lowest action voltage of the circuit breaker, which is not limited by the working state of the circuit breaker.
According to the embodiment of the invention, the following advantages are provided:
a method for comprehensively evaluating the lowest action voltage of a circuit breaker comprises the steps of selecting opening and closing current-time curves of a plurality of voltages under the condition that the circuit breaker is in a fault-free state, dividing each opening and closing current-time curve into a plurality of curve intervals by using an extreme method, selecting 3 curve intervals associated with the lowest action voltage, and sequentially setting the curve intervals respectively corresponding to a ta coil electrification stage, a tb iron core movement stage and a tc tripping stage, namely the ta stage, the tb stage and the tc stage;
respectively calculating the area of the corresponding curve intervals of a stage ta, a stage tb and a stage tc of each opening and closing current-time curve to obtain thermal power consumption of the curve intervals, dividing thermal power consumption of the same stage under different voltages into a group to obtain 3 groups of thermal power consumption-voltage arrays, and obtaining 3 stages of thermal power consumption-voltage standard curves by using a curve fitting method, namely a standard curve qa (u) of the stage ta, a standard curve qb (u) of the stage tb and a standard curve qc (u) of the stage tc;
extracting actual thermal power consumption corresponding to actual operating voltage and standard thermal power consumption corresponding to set operating voltage from the thermal power consumption-voltage standard curves of 3 stages respectively, calculating heat quantity deviation of the 3 stages by using the actual thermal power consumption and the standard thermal power consumption, and correcting the thermal power consumption-voltage standard curves by using a translation curve method according to the heat quantity deviation of each stage to obtain thermal power consumption-voltage correction curves of the 3 stages, which are respectively marked as a correction curve qa ' (u) of a stage ta, a correction curve qb ' (u) of the stage tb and a correction curve qc ' (u) of a stage tc;
respectively extracting standard thermal power consumption corresponding to the actual lowest operating voltage in the standard curves qa (U), qb (U) and qc (U), respectively extracting correction voltage corresponding to the standard thermal power consumption from the correction curves qa ' (U), qb ' (U) and qc ' (U), and obtaining a lowest operating voltage vector U according to the correction voltage of 3 stages;
comprehensively giving evaluation weights W of 3 stages by using an analytic hierarchy process for breaker fault data, and performing dimensionality reduction on the lowest action voltage vector U to obtain a corrected lowest action voltage
I.e. by
。
According to the comprehensive evaluation method for the lowest action voltage of the circuit breaker, disclosed by the invention, through an actual current selection method, the thermal power consumption of each stage is calculated through a curve discretization method, the current and time change conditions under different voltages in the working process of the circuit breaker are analyzed, a thermal power consumption-voltage curve is established, the thermal power consumption-voltage curve is corrected, the actual working condition of the lowest action voltage of the circuit breaker is evaluated, the problem that whether the lowest action voltage of the circuit breaker is normal or not is accurately evaluated under the electrified condition of the circuit breaker is solved, the field applicability is improved, the working condition of the lowest action voltage of the circuit breaker is monitored in real time, and the condition that whether the circuit breaker is normal or not can be predicted in advance. Moreover, the influence of thermal power consumption on the lowest action voltage in multiple stages of the electromagnet is integrated, the lowest action voltage of the circuit breaker is comprehensively evaluated, and the accuracy of the evaluation result is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
Fig. 1 is a stage diagram of a circuit breaker opening and closing current-time curve according to an embodiment of the present invention;
FIG. 2 is a graph of a fitted thermal power consumption-voltage standard according to an embodiment of the present invention;
FIG. 3 is a graph of a modified fitted thermal power consumption-voltage standard according to an embodiment of the present invention;
fig. 4 is a correction graph of correcting the standard curve according to the deviation of the heating value by using the method of using the shift curve according to the embodiment of the present invention.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the present specification, the terms "upper", "lower", "left", "right", "middle", and the like are used for clarity of description, and are not intended to limit the scope of the present invention, and changes or modifications in the relative relationship may be made without substantial changes in the technical content.
As shown in fig. 1, in the method for comprehensively evaluating the minimum operating voltage of the circuit breaker according to the embodiment of the present invention, after the circuit breaker leaves a factory and is repaired, the control loop voltage is adjusted, and the opening and closing current characteristic curves of the circuit breaker operating mechanism at least including the rated operating voltage, the 65% rated operating voltage, the 80% rated operating voltage, the 110% rated operating voltage, and the standard minimum operating voltage, that is, the opening and closing current-time curves at different voltages, are selected. The opening and closing current-time curve of the circuit breaker operating mechanism under other different voltages can be increased so as to increase the accuracy of the fitting curve and the real curve.
Dividing the opening and closing current-time curves obtained under different voltages into a plurality of curve intervals according to an extreme method, selecting 3 working stages related to the lowest action voltage in each curve, as shown in fig. 2, sequentially marking a Ta (T0-Ta) coil electrification stage, a Tb (Ta-Tb) iron core movement stage and a Tc (Tb-Tc) tripping stage as a Ta stage, a Tb stage and a Tc stage, wherein after the Tc stage, a tripping part is opened, the action condition after the opening is unrelated to the action voltage, and the change of each stage is as follows:
ta (T0-Ta) coil charging phase: at the time of T0, the closing coil is electrified, current passes through the coil, the current is small, the generated magnetic flux is also small, the electromagnetic force applied to the movable iron core is not enough to move the movable iron core, and the position of the movable iron core is kept unchanged. The problems that the turn-to-turn insulation performance is reduced, the iron core resetting positions are inconsistent and the like exist in the Ta stage, the problem that the adjustment of the breath of the iron core is not proper occurs in the overhauling process, and the problem is mainly shown in that the current changes along with the change of the duration. When the coil current is increased or the time is prolonged, the lowest action voltage is increased, and conversely, the lowest action voltage is reduced.
Tb (Ta-Tb) iron core movement stage: at time Ta, the movable iron core starts moving. Along with the movement of the iron core, the air gap of the magnetic circuit is reduced, the magnetic resistance of the air gap is reduced, the inductance of the coil is increased, and the current of the coil is gradually reduced. And at the time of Tb, the movement speed of the iron core reaches the maximum, the iron core moves to the position, the impact rod impacts the closing trigger, and the movement is stopped. If the movable iron core is jammed, the duration of the stage ta is prolonged; if the attraction of the moving and static iron cores of the electromagnet is not good (the combination plane is not clean or the combination surface is not smooth), the duration of the tb stage can be prolonged. The lowest operating voltage is increased under the conditions of local jitter, advanced rise and time extension of the current.
Tc (Tb-Tc) stage: at the time of Tb, the movable iron core moves to the position, the impact rod impacts the closing trigger to stop moving, the energy storage mechanism starts to release energy storage, and then the movable contact of the high-voltage circuit breaker starts to act. At this stage, the movable iron core is not moved, the air gap of the magnetic circuit is not changed, the magnetic resistance is not changed, and the inductance is constant. The current of the coil rises according to an exponential law, and after the transient process of the current rising, the current does not increase any more and enters a steady-flow stage. The Tc stage has the problems of insufficient buckling quantity, unsmooth tripping board, tripping position change (tripping board deformation) and the like, the current changes along with the increase of duration, when the coil current increases or local jitter occurs, and the time is prolonged, the lowest action voltage is increased, otherwise, the lowest action voltage is reduced.
The method comprises the steps of respectively calculating the curve areas of a ta stage, a tb stage and a tc stage on a switching-on and switching-off current-time curve under different voltages, and particularly comprises the step of equally dividing the overall time interval T of a curve interval into n trapezoidal micro intervals p by adopting a curve discretization method, wherein the time interval of the micro intervals is denoted as tp, namely the overall time interval T = n × tp of the curve interval.
Extracting current values at two ends of the micro interval p according to the time interval tp
And
the two ends of the micro interval p are the starting time point and the ending time point of the micro interval p, and the area of the n micro intervals is calculated by using a trapezoidal area formula
The concrete formula is as follows:
summing the areas of n micro trapezoids divided in the interval area to obtain the total area of the curve interval, namely the total heat power consumption of the curve interval
The concrete formula is as follows:
the total thermal power consumption of the ta stage, the tb stage and the tc stage are sequentially recorded as
To do so by
For example, the curve interval of the stage Ta is equally divided into 20 micro-intervals pa by time, the time interval of the micro-intervals is represented as tpa, that is, the total time interval Ta =20tpa of the stage Ta, and the total thermal power consumption of the stage Ta is obtained
The formula is as follows:
and (3) dividing the heat power consumption in the same stage under different voltages into one group to obtain 3 groups of heat power consumption-voltage arrays. For example, thermal power consumption in the ta stage under different voltages is divided into a group, and a thermal power consumption-voltage array in the ta stage (Qa 1-U1, Qa2-U2 … Qan-Un), a thermal power consumption-voltage array in the tb stage (Qb 1-U1, Qb2-U2 … Qbn-Un), and a thermal power consumption-voltage array in the tc stage (Qc 1-U1, Qc2-U2 … Qcn-Un) are obtained. In order to improve the accuracy of the algorithm, the selection of the current characteristic curve can be carried out for multiple times under the same voltage, and the average value of multiple thermal power consumptions at the same position is obtained to obtain the correction quantity of the thermal power consumption.
As shown in FIG. 3, a thermal power consumption-voltage standard curve is obtained by using a curve fitting method for the thermal power consumption-voltage array, and is denoted as a standard curve qa (u) at stage ta, a standard curve qb (u) at stage tb, and a standard curve qc (u) at stage tc.
The actual action voltage of each action control loop of the circuit breaker is influenced by the field environment
Is not stabilized at the set operating voltage
Actual operating voltage
Relative to the set operating voltage
There will be a certain deviation, i.e.
≠
. Finding the corresponding actual operating voltage in the standard curve qa (u), the standard curve qb (u), and the standard curve qc (u)
Actual heat power consumption
And setting an operating voltage correspondingly
Standard heat power consumption of
The deviation of the heat generation amount in 3 stages is calculated, and expressed as Δ Qa in the stage ta, Δ Qb in the stage tb, and Δ Qc in the stage tc in this order, that is:
as shown in fig. 4, the standard curve is corrected by a method using a shift curve according to the deviation of the heat generation amount. Specifically, the standard curve Qa (u) is corrected by using a translation curve method according to the heating value deviation Δ Qa to obtain a corrected curve Qa' (u); correcting the standard curve Qb (u) by using a translation curve method according to the heating value deviation delta Qb to obtain a corrected curve Qb' (u); the standard curve Qc (u) is corrected by using a translation curve according to the heat generation amount deviation Δ Qc, and a correction curve Qc' (u) is obtained. The curve is corrected on the basis of the standard curve, various factors influencing the voltage in the actual working environment can be eliminated, and the corrected curve is closest to the actual situation.
Selecting the thermal power consumption corresponding to the actual lowest operating voltage in the standard curve qa (u)
The thermal power consumption corresponding to the actual lowest operating voltage in the calibration curve qb (u)
The thermal power consumption corresponding to the actual lowest operating voltage in the calibration curve qc (u)
。
Determining and from the correction curve qa' (u)
The corresponding correction voltage Ua 'is determined from the correction curve qb' (u) and
the corresponding correction voltage Ub 'is determined from the correction curve qc' (u) and
and obtaining the lowest action voltage vector U (Ua ', Ub', Uc ') by the corresponding correction voltage Uc'.
Because various factors influence the minimum action voltage of the circuit breaker in actual work, the influence factors comprise environmental factors, operation life and mechanism types, the evaluation weight is comprehensively given by adopting a fault statistics combined hierarchy analysis method, and the specific calculation method comprises the following steps:
firstly, the influence of environmental factors, the operation life and the mechanism type on the lowest action voltage is analyzed according to the statistical data of the fault reasons of the circuit breaker.
The environment factors comprise temperature, humidity, salinity, irradiation and the like, and different environment factors have different influences on the metal, for example, the metal in the coastal region is easy to rust and oxidize; and the problem of lubricating grease solidification is easy to occur in inland cold areas. This kind of problem all can lead to the electro-magnet motion to be stuck, and then leads to minimum action voltage to rise.
The operational age factor is based on the equipment operational life bathtub curve. The circuit breaker starts to operate normally, and metal fatigue or insufficient metal rigidity often appear after 2 years of operation, resulting in the change of minimum operating voltage. For example, the lowest operating voltage is increased due to the problem of jamming of tripping movement caused by insufficient metal rigidity or the tripping buckling amount is reduced due to insufficient rigidity, so that the lowest operating voltage is reduced.
The mechanism type refers to the influence of the mechanism types of different circuit breakers on the lowest operating voltage variation. For example, a similar problem occurs in an organization at irregular intervals after the organization is put into operation, and the organization problem is defined in the case. For example, the problems of valve core movement jamming caused by long-term standing of a certain switch occur in Beijing, Guangdong, Shandong and the like, the problems belong to common diseases of mechanisms and are unrelated to environment and operation age, or certain faults are determined to be familial defects, and the problems belong to the influence of mechanism types.
Specifically, the fault proportion of the circuit breaker with the lowest abnormal operating voltage caused by environmental factors, the commissioning time limit and the mechanism type is counted, wherein fault data within the commissioning time limit of 1 year are ignored. Specifically, the failure fraction of environmental factors is recorded as
The percentage of failures in the operational life is recorded
The fault ratio of the type of mechanism is recorded as
The matrix a is obtained according to the importance of the above 3 factors, where the importance of the environmental factor relative to the operational life is 4, and the ratio of the fault occupation ratios of the respective elements is used as the importance, for example, the fault occupation ratio caused by the environmental factor is 40%, and the fault occupation ratio of the operational life is 10%.
According to the data statistics of the lowest action voltage abnormity caused by environmental factors, the fault ratios in the stage ta, the stage tb and the stage tc are calculated, wherein the fault ratio in the stage ta is recorded as
The percentage of failures in the tb stage is recorded
The fault ratio of the tc phase is recorded as
And obtaining a matrix E.
According to the data statistics of the lowest action voltage abnormity caused by environmental factors, the fault ratios in the stage ta, the stage tb and the stage tc are calculated, wherein the fault ratio in the stage ta is recorded as
The percentage of failures in the tb stage is recorded
The fault ratio of the tc phase is recorded as
And obtaining a matrix Y.
According to the data statistics of the lowest action voltage abnormality caused by the mechanism type, the fault ratios in the stage ta, the stage tb and the stage tc are calculated, wherein the fault ratio in the stage ta is recorded as
The percentage of failures in the tb stage is recorded
The fault ratio of the tc phase is recorded as
And obtaining a matrix J.
The matrix A, the matrix E, the matrix Y and the matrix J are respectively normalized to obtain a weight vector WA (wA 1, wA2 and wA 3), WE (wE 1, wE2 and wE 3), WY (wY 1, wY2 and wY 3), WJ (wJ 1, wJ2 and wJ 3) and maximum eigenvalues lambda A, lambda E, lambda Y and lambda J of each matrix, and consistency check is carried out.
And finally obtaining the influence weight vector W of the ta stage, the tb stage and the tc stage on the lowest action voltage according to different influence degrees of the matrixes of the layers on the overall target.
Performing dimension reduction on the lowest action voltage vector U, giving a weight vector W to obtain the corrected lowest action voltage
The expression is as follows:
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (6)
1. A comprehensive evaluation method for the lowest action voltage of a circuit breaker is characterized by comprising the following steps: selecting opening and closing current-time curves of a plurality of voltages under the fault-free state of the circuit breaker, dividing each opening and closing current-time curve into a plurality of curve intervals by using an extreme method, selecting 3 curve intervals associated with the lowest action voltage, and sequentially arranging curve intervals respectively corresponding to a ta coil electrification stage, a tb iron core movement stage and a tc tripping stage, namely a ta stage, a tb stage and a tc stage;
respectively calculating the interval areas of curve intervals corresponding to a stage ta, a stage tb and a stage tc of each opening and closing current-time curve to obtain heat power consumption of a plurality of stages ta, tb and tc, dividing heat power consumption of the same stage under different voltages into a group to obtain 3 groups of heat power consumption-voltage arrays, and obtaining heat power consumption-voltage standard curves of 3 stages by using a curve fitting method, namely standard curves qa (u) of the stage ta, standard curves qb (u) of the stage tb and standard curves qc (u) of the stage tc;
extracting actual thermal power consumption corresponding to actual operating voltage and standard thermal power consumption corresponding to set operating voltage from the thermal power consumption-voltage standard curves of 3 stages respectively, calculating heat quantity deviation of the 3 stages by using the actual thermal power consumption and the standard thermal power consumption, and correcting the thermal power consumption-voltage standard curves by using a translation curve method according to the heat quantity deviation of each stage to obtain thermal power consumption-voltage correction curves of the 3 stages, which are respectively marked as a correction curve qa ' (u) of a stage ta, a correction curve qb ' (u) of the stage tb and a correction curve qc ' (u) of a stage tc;
respectively extracting heat power consumption corresponding to the actual lowest operating voltage in the standard curve qa (U), the standard curve qb (U) and the standard curve qc (U), respectively extracting correction voltage corresponding to the heat power consumption of the actual lowest operating voltage from the correction curve qa ' (U), the correction curve qb ' (U) and the correction curve qc ' (U), and obtaining a lowest operating voltage vector U according to the correction voltage of 3 stages;
comprehensively providing evaluation weight W for fault data of the circuit breaker by using an analytic hierarchy process, and performing dimensionality reduction on the lowest action voltage vector U to obtain corrected lowest action voltage
I.e. by
。
2. The comprehensive evaluation method for the lowest operating voltage of the circuit breaker according to claim 1, characterized in that: and selecting a switching-on and switching-off current-time curve of rated working voltage, 65% of rated working voltage, 80% of rated working voltage, 110% of rated working voltage and standard lowest action voltage under the fault-free state of the circuit breaker.
3. The method for comprehensively evaluating the minimum operating voltage of the circuit breaker according to claim 1, wherein the method for calculating the interval area of the curve interval in the ta stage, the tb stage or the tc stage comprises:
equally dividing the whole time interval T of the curve interval into n micro intervals p by adopting a curve discretization method, and marking the time interval of the micro intervals as tp, namely the whole time interval T = n × tp of the curve interval;
extracting current values at two ends of the micro interval according to the time interval tp
And
respectively calculating the area of each micro-section to obtain the thermal power consumption of n micro-sections
；
Summing the thermal power consumption of the n micro intervals to obtain the total thermal power consumption of the curve interval
The concrete formula is as follows:
4. the comprehensive evaluation method for the lowest operating voltage of the circuit breaker according to claim 1, characterized in that: the reference curves qa (u), qb (u), and qc (u) are extracted to correspond to the actual operating voltages
Actual heat power consumption
Setting an operating voltage in accordance with the voltage
Standard heat power ofConsumption unit
The deviation of the heat generation amount in 3 stages is calculated, and expressed as Δ Qa in the stage ta, Δ Qb in the stage tb, and Δ Qc in the stage tc in this order, that is:
5. the comprehensive evaluation method for the lowest operating voltage of the circuit breaker according to claim 4, characterized in that: extracting the thermal power consumption corresponding to the actual lowest operating voltage in the standard curve qa (u)
Extracting the thermal power consumption corresponding to the actual lowest operating voltage in the standard curve qb (u)
Extracting the thermal power consumption corresponding to the actual lowest operating voltage in the standard curve qc (u)
；
Determining and from the correction curve qa' (u)
The corresponding correction voltage Ua 'is determined from the correction curve qb' (u) and
the corresponding correction voltage Ub 'is determined from the correction curve qc' (u) and
and obtaining the lowest action voltage vector U (Ua ', Ub', Uc ') by the corresponding correction voltage Uc'.
6. The comprehensive evaluation method for the lowest operating voltage of the circuit breaker according to claim 1, characterized in that: the method for comprehensively providing the evaluation weight W of 3 stages for the fault data of the circuit breaker by using an analytic hierarchy process comprises the following specific calculation method:
counting the fault proportion of the circuit breaker to the occurrence of the lowest action voltage abnormity due to environmental factors, operation years and mechanism types, wherein the fault proportion of the environmental factors is recorded as
The percentage of failures in the operational life is recorded
The fault ratio of the type of mechanism is recorded as
Obtaining a matrix A;
according to the data statistics of the lowest action voltage abnormity caused by environmental factors, the fault ratios in the stage ta, the stage tb and the stage tc are calculated, wherein the fault ratio in the stage ta is recorded as
The percentage of failures in the tb stage is recorded
The fault ratio of the tc phase is recorded as
Obtaining a matrix E;
according to the data statistics of the lowest action voltage abnormity caused by environmental factors, the fault ratios in the stage ta, the stage tb and the stage tc are calculated, wherein the fault ratio in the stage ta is recorded as
The percentage of failures in the tb stage is recorded
The fault ratio of the tc phase is recorded as
Obtaining a matrix Y;
according to the data statistics of the lowest action voltage abnormality caused by the mechanism type, the fault ratios in the stage ta, the stage tb and the stage tc are calculated, wherein the fault ratio in the stage ta is recorded as
The percentage of failures in the tb stage is recorded
The fault ratio of the tc phase is recorded as
Obtaining a matrix J;
respectively normalizing the matrix A, the matrix E, the matrix Y and the matrix J to obtain a weight vector WA (wA 1, wA2 and wA 3), WE (wE 1, wE2 and wE 3), WY (wY 1, wY2 and wY 3), WJ (wJ 1, wJ2 and wJ 3) and maximum eigenvalues lambda A, lambda E, lambda Y and lambda J of each matrix, and carrying out consistency check;
according to different influence degrees of the matrixes of the layers on the overall target, finally obtaining influence weight vectors W of a plurality of curve intervals on the lowest action voltage;
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