CN114636952B - System and method for diagnosing fault phase of capacitor bank - Google Patents

System and method for diagnosing fault phase of capacitor bank Download PDF

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Publication number
CN114636952B
CN114636952B CN202210536449.4A CN202210536449A CN114636952B CN 114636952 B CN114636952 B CN 114636952B CN 202210536449 A CN202210536449 A CN 202210536449A CN 114636952 B CN114636952 B CN 114636952B
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phase
capacitor
impedance
phases
value
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CN114636952A (en
Inventor
刘崧
王俊波
李兰茵
刘少辉
蒋维
罗容波
赖艳珊
张思寒
李国伟
宋安琪
王云飞
吴焯军
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Foshan Power Supply Bureau of Guangdong Power Grid Corp
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Foshan Power Supply Bureau of Guangdong Power Grid Corp
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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
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/64—Testing of capacitors
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations

Abstract

The application discloses a system and a method for diagnosing fault phase of a capacitor bank, wherein the system comprises the following steps: an acquisition unit for acquiring three phases of the busHistorical data of voltage and three-phase current of the capacitor are obtained, and the parallel connection number of capacitor units in the capacitor bank and the series reactance rate of the reactor are obtained; a construction unit for performing transformation analysis based on the three-phase impedance calculation formula of the capacitor after single-phase breakdown of the capacitor, and respectively constructing three phases of the capacitor
Figure 101858DEST_PATH_IMAGE001
A value calculation formula; a computing unit for basing on three phases
Figure 493525DEST_PATH_IMAGE001
Value calculation formula, which respectively calculates one phase according to historical data, parallel connection number and series reactance rate
Figure 321454DEST_PATH_IMAGE001
Of the other two phases at a value of 0
Figure 990332DEST_PATH_IMAGE001
Values of thereby obtaining three groups
Figure 46013DEST_PATH_IMAGE001
Value data; an analysis unit for analyzing the three groups
Figure 862659DEST_PATH_IMAGE001
The value data is used for analyzing the fault phase of the capacitor bank to obtain the phase of the fault of the capacitor, so that the technical problems of poor accuracy and long time for diagnosing the fault phase of the capacitor bank in the prior art are solved.

Description

System and method for diagnosing fault phase of capacitor bank
Technical Field
The application relates to the technical field of capacitors, in particular to a capacitor bank fault phase diagnosis system and method.
Background
In an electric power system, a shunt capacitor is taken as a reactive compensation device which is most applied, the stable operation of the shunt capacitor is an important guarantee for the safety and the stability of the electric power system, and at present, the unbalanced protection tripping of a capacitor bank can occur for 2 to 3 times every year. The prior art is a power failure test after tripping, and because the equipment is in a non-operating voltage and load state during the power failure test, the insulation condition and the fault development trend of the capacitor in the actual operating state cannot be truly reflected, so that the method has great limitation; in addition, the maintainer needs to detect each branch of the capacitor bank one by one to locate the fault, and the number of the capacitor units is large, so that a large amount of time is needed for detection, and the overhauling efficiency is influenced.
Disclosure of Invention
The application provides a capacitor bank fault phase diagnosis system and method, which are used for solving the technical problems of poor accuracy and long time of capacitor bank fault phase diagnosis in the prior art.
In view of the above, a first aspect of the present application provides a phase-to-phase fault diagnosis system for a capacitor bank, the system comprising:
the acquisition unit is used for acquiring historical data of bus three-phase voltage and capacitor three-phase current, and acquiring the parallel connection number of capacitor units in the capacitor bank and the series reactance rate of the reactor;
a construction unit for performing transformation analysis based on a three-phase impedance calculation formula of the capacitor after single-phase breakdown of the capacitor to respectively construct three phases of the capacitor
Figure 940624DEST_PATH_IMAGE001
A value calculation formula;
a computing unit for computing the three phases
Figure 692680DEST_PATH_IMAGE001
A value calculation formula for respectively calculating one phase according to the historical data, the parallel number and the series reactance rate
Figure 452825DEST_PATH_IMAGE001
Of the other two phases at a value of 0
Figure 719859DEST_PATH_IMAGE001
Values of thereby obtaining three groups
Figure 856442DEST_PATH_IMAGE001
Value data;
an analysis unit for analyzing the three groups
Figure 525321DEST_PATH_IMAGE001
And analyzing the fault phase of the capacitor bank by the value data to obtain the fault phase of the capacitor.
Optionally, the three phases
Figure 456368DEST_PATH_IMAGE001
The value calculation formula specifically includes:
when in useβ a When =0, there are
Figure 148380DEST_PATH_IMAGE002
；
When in useβ b When =0, there are
Figure 885392DEST_PATH_IMAGE003
；
When in useβ c When =0, there are
Figure 343531DEST_PATH_IMAGE004
；
In the formula (I), the compound is shown in the specification,
Figure 773375DEST_PATH_IMAGE005
、
Figure 952684DEST_PATH_IMAGE006
、
Figure 227807DEST_PATH_IMAGE007
is the capacity value change coefficient of the three phases of the capacitor,
Figure 808961DEST_PATH_IMAGE008
the number of the parallel connection is the same as the number of the parallel connection,
Figure 81811DEST_PATH_IMAGE009
in order to be the cross-talk rate,
Figure 810732DEST_PATH_IMAGE010
the ratio of the impedances between the two phases of the capacitor, for example,
Figure 827230DEST_PATH_IMAGE011
the ratio of the phase a impedance to the phase B impedance of the capacitor,
Figure 325207DEST_PATH_IMAGE012
is the ratio of the impedance of the capacitor phase B to the impedance of the phase a.
Optionally, the analysis unit is specifically configured to:
calculating one phase of the capacitor separately
Figure 34537DEST_PATH_IMAGE001
At a value of zero, of the other two phases
Figure 985176DEST_PATH_IMAGE001
And obtaining the ratio of three phases by taking the ratio of absolute values, and determining the phase with the minimum ratio as the phase with the fault capacitor.
Optionally, the obtaining unit is specifically configured to:
acquiring historical data of three-phase voltages of a 10kV bus and a 35kV bus and three-phase currents of a capacitor from a power grid data acquisition and monitoring control system;
and opening an equipment ledger module in the equipment management system by a network crawler technology, and crawling the parallel connection number of the capacitor units in the capacitor bank and the series reactance rate of the reactor.
Optionally, the three-phase impedance calculation formula specifically includes:
Figure 805364DEST_PATH_IMAGE013
；
wherein m is the number of the parallel connections, omega is the frequency, C o Is the capacitance value of the capacitor unit, k is the series reactance rate,
Figure 157848DEST_PATH_IMAGE005
、
Figure 38079DEST_PATH_IMAGE006
、
Figure 476014DEST_PATH_IMAGE007
the capacity value change coefficient of three phases of the capacitor.
A second aspect of the present application provides a method for diagnosing a fault phase of a capacitor bank, the method comprising:
acquiring historical data of three-phase voltage of a bus and three-phase current of a capacitor, and acquiring the parallel connection number of capacitor units in a capacitor bank and the series reactance rate of a reactor;
performing transformation analysis based on a three-phase impedance calculation formula of the capacitor after the capacitor is subjected to single-phase breakdown, and respectively constructing three phases of the capacitor
Figure 831384DEST_PATH_IMAGE001
A value calculation formula;
based on said three phases
Figure 241637DEST_PATH_IMAGE001
A value calculation formula for respectively calculating one phase according to the historical data, the parallel number and the series reactance rate
Figure 355087DEST_PATH_IMAGE001
Of the other two phases at a value of 0
Figure 218000DEST_PATH_IMAGE001
Values of thereby obtaining three groups
Figure 442308DEST_PATH_IMAGE001
Value data;
according to the three groups
Figure 441488DEST_PATH_IMAGE001
And analyzing the fault phase of the capacitor bank by the value data to obtain the fault phase of the capacitor.
Optionally, the three phases
Figure 725839DEST_PATH_IMAGE001
The value calculation formula specifically includes:
when in useβ a When =0, there are
Figure 76049DEST_PATH_IMAGE002
；
When in useβ b When =0, there are
Figure 41731DEST_PATH_IMAGE003
；
When in useβ c When =0, there are
Figure 223314DEST_PATH_IMAGE004
；
In the formula (I), the compound is shown in the specification,
Figure 350670DEST_PATH_IMAGE005
、
Figure 250493DEST_PATH_IMAGE006
、
Figure 754286DEST_PATH_IMAGE007
is the capacity value change coefficient of the three phases of the capacitor,
Figure 55955DEST_PATH_IMAGE008
the number of the parallel connection is the same as the number of the parallel connection,
Figure 351282DEST_PATH_IMAGE009
in order to be the cross-talk rate,
Figure 676084DEST_PATH_IMAGE010
the ratio of the impedances between the two phases of the capacitor, for example,
Figure 45886DEST_PATH_IMAGE011
the ratio of the phase a impedance to the phase B impedance of the capacitor,
Figure 874165DEST_PATH_IMAGE012
is the ratio of the impedance of the capacitor phase B to the impedance of the phase a.
Optionally, the method according to the three groups
Figure 671219DEST_PATH_IMAGE001
The value data is analyzed to the capacitor bank fault phase to obtain the phase of the capacitor fault, and the method specifically comprises the following steps:
calculating one phase of the capacitor separately
Figure 217738DEST_PATH_IMAGE001
At a value of zero, of the other two phases
Figure 391231DEST_PATH_IMAGE001
And obtaining the ratio of three phases by taking the ratio of absolute values, and determining the phase with the minimum ratio as the phase with the fault capacitor.
Optionally, the obtaining the parallel connection number of the capacitor units in the capacitor bank and the series reactance rate of the reactor specifically includes:
and opening an equipment ledger module in the equipment management system by a network crawler technology, and crawling the parallel connection number of the capacitor units in the capacitor bank and the series reactance rate of the reactor.
Optionally, the three-phase impedance calculation formula specifically includes:
Figure 339595DEST_PATH_IMAGE013
；
wherein m is the number of the parallel connections, omega is the frequency, C o Is the capacitance value of the capacitor unit, k is the series reactance rate,
Figure 307551DEST_PATH_IMAGE005
、
Figure 341366DEST_PATH_IMAGE006
、
Figure 52970DEST_PATH_IMAGE007
the capacity value change coefficient of three phases of the capacitor.
The application provides a capacitor bank fault phase diagnosis system, includes: the acquisition unit is used for acquiring historical data of bus three-phase voltage and capacitor three-phase current, and acquiring the parallel connection number of capacitor units in the capacitor bank and the series reactance rate of the reactor; a construction unit for performing transformation analysis based on the three-phase impedance calculation formula of the capacitor after single-phase breakdown of the capacitor, and respectively constructing three phases of the capacitor
Figure 855841DEST_PATH_IMAGE001
A value calculation formula; a computing unit for basing on three phases
Figure 932382DEST_PATH_IMAGE001
Value calculation formula, which respectively calculates one phase according to historical data, parallel connection number and series reactance rate
Figure 515810DEST_PATH_IMAGE001
Of the other two phases at a value of 0
Figure 700279DEST_PATH_IMAGE001
Values of thereby obtaining three groups
Figure 685552DEST_PATH_IMAGE001
Value data; an analysis unit for analyzing the three groups
Figure 932994DEST_PATH_IMAGE001
And analyzing the fault phase of the capacitor bank by the value data to obtain the fault phase of the capacitor.
Compared with the prior art, this application: 1. in implementation, the 10kV bus three-phase voltage corresponding to a certain capacitor in an SCADA (power grid data acquisition and monitoring control system) and the historical data of the capacitor three-phase current thereof are accessed into the capacitor bank fault phase diagnosis system of the system, an equipment ledger module in an equipment management system is opened through a network crawler technology, and the parallel number of capacitor units in the capacitor bank and the series reactance rate of a reactor are crawled, so that accurate and rapid fault diagnosis can be performed on all capacitor banks, preferably the prior art: the software system of the relay protection device is added, the work needs to be carried out aiming at each capacitor relay protection device, the cost is high, the construction period is long, and meanwhile, the configuration difficulty of the software is increased due to the fact that different capacitor protection manufacturers are different. 2. Because the period of data acquisition of the relay protection device is short, the data volume is small, the capacitor fault location is carried out through a small amount of data in the prior art, the possibility of error diagnosis is high, but the system can read and store a large amount of data, the fault evolution rule can be analyzed through a large amount of data, and the condition of large-amount data storage is that the relay protection device is difficult to have. Therefore, the technical problems of poor accuracy and long time for diagnosing the fault phase of the capacitor bank in the prior art are solved.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a phase-to-fault diagnosis system for a capacitor bank provided in an embodiment of the present application;
fig. 2 is a schematic flowchart of an embodiment of a method for diagnosing a fault phase of a capacitor bank provided in an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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 application.
Interpretation of terms:
SCADA: an scada (supervisory Control And Data acquisition) system, i.e. a Data acquisition And monitoring Control system. The SCADA system is most widely applied to the power system, and the technical development is the most mature. The energy management system is used as a main subsystem of an Energy Management System (EMS), has the advantages of complete information, efficiency improvement, correct control of system running state, decision acceleration, capability of helping to quickly diagnose system fault state and the like, and is an indispensable tool for power dispatching. The method has irreplaceable effects on improving the reliability, safety and economic benefit of power grid operation, lightening dispatchers, realizing power dispatching automation and modernization, and improving dispatching efficiency and level.
Referring to fig. 1, a phase-to-phase fault diagnosis system for a capacitor bank provided in an embodiment of the present application includes:
the acquisition unit 101 is used for acquiring historical data of bus three-phase voltage and capacitor three-phase current, and acquiring the parallel connection number of capacitor units in a capacitor bank and the series reactance rate of a reactor;
it should be noted that in the specific application of the embodiment, historical data of three-phase voltages of a 10kV bus and a 35kV bus and three-phase currents of a capacitor are acquired from a power grid data acquisition and monitoring control system; wherein, three-phase voltage is respectively: UA =6.04kV, UB =6.04kV, UC =6.01kV, the three-phase current is: IA =320.27a, IB =320.05a, IC = 315.68A.
Then, automatically opening an equipment ledger module in the equipment management system by using a web crawler, crawling the number m =6 of capacitor units related to a capacitor group in parallel, and leading the capacitor units into the system, wherein the serial reactance rate k = 5%.
A constructing unit 102, configured to perform transformation analysis based on a three-phase impedance calculation formula of the capacitor after single-phase breakdown of the capacitor, and respectively construct three phases of the capacitor
Figure 3718DEST_PATH_IMAGE001
A value calculation formula;
note that three phases of the capacitor are constructed
Figure 994808DEST_PATH_IMAGE001
The principle process of the value calculation formula is as follows:
when the capacitor is subjected to single-phase breakdown but the fault phase cannot be determined, it is assumed that A, B, C-phase capacitor groups respectively have capacitance value changes, and the capacitance value changesβ a C 0 、β b C 0 、β c C 0 Then, the impedance calculation formula for three phases is:
Figure 772271DEST_PATH_IMAGE014
（1）
in the formula: m is the number of parallel units (parallel number) of the capacitor bank single phase, omega is frequency, C o Is the capacitance value of the capacitor unit, k is the series reactance rate,βis a capacity variation coefficient.
The three-phase impedance is mainly capacitive reactance, and because the neutral point voltage is usually tens of volts and is far less than the bus voltage of several kilovolts and can be ignored, the relationship between the impedance and the bus voltage and the capacitance current is simplified and then is expressed as formula (2):
Figure 252931DEST_PATH_IMAGE015
（2）
in the formula:I a 、I b 、I c is a three-phase current of the capacitor bank,U a 、U b 、U c is a three-phase bus phase voltage.
Since the breakdown fault of the capacitor is mainly single-phase breakdown, when one phase of the capacitor is broken down, the three-phase impedance is inevitably unbalanced, and the formula (2) is the total three-phase impedance, so that the internal problem of the capacitor unit is difficult to find, the breakdown quantity beta value of the capacitor unit is required to comprehensively judge and amplify the difference of the three-phase impedance caused by the single-phase breakdown. Based on the principle, as the voltage and current in the formula (2) are SCADA data, the orderX A /X B =t ab ，X B /X C =t bc ，X C /X A =t ca ，X B /X A =t ba ，X C /X B =t cb ，XA/XC=t ac Connecting the vertical type (1) and (2), finally calculating one phaseβAt 0, the other two phasesβThe value:
when in useβ a When =0, the following formula (3):
Figure 483055DEST_PATH_IMAGE016
（3）
when in useβ b When =0, the compound has the formula (4):
Figure 340153DEST_PATH_IMAGE017
（4）
when in useβ c When =0, the following formula (5):
Figure 972122DEST_PATH_IMAGE018
（5）
a calculation unit 103 for calculating three-phase-based
Figure 623684DEST_PATH_IMAGE001
Value calculation formula, which respectively calculates one phase according to historical data, parallel connection number and series reactance rate
Figure 606683DEST_PATH_IMAGE001
Of the other two phases at a value of 0
Figure 1892DEST_PATH_IMAGE001
Values of thereby obtaining three groups
Figure 488368DEST_PATH_IMAGE001
Value data;
in step 103 of this embodiment, three groups of β values of the capacitor are calculated by using the three-phase voltage, the three-phase current historical data, the parallel number and the series reactance rate obtained in step 101 as follows:
when in useβ a When the value is not less than 0, the reaction time is not less than 0,β b =0.025，β c = -0.053；
when in useβ b When the value is not less than 0, the reaction time is not less than 0,β a = -0.024，β c = -0.079；
when in useβ c When the pressure is not higher than 0, the pressure is lower than 0,β a =0.054，β b =0.079；
an analysis unit 104 for analyzing the three groups
Figure 576410DEST_PATH_IMAGE001
And analyzing the fault phase of the capacitor bank by the value data to obtain the fault phase of the capacitor.
It should be noted that, in this embodiment, the calculation of one phase of the capacitor is specifically performed separately
Figure 801634DEST_PATH_IMAGE001
When the value is zero, the other twoOf phase
Figure 535DEST_PATH_IMAGE001
And obtaining the ratio of three phases by taking the ratio of absolute values, and determining the phase with the minimum ratio as the phase with the fault capacitor.
First, for each groupβThe values were calculated analytically. Firstly, 3 groupsβTaking absolute value of the value, and calculating two of larger and smaller in three groupsβRatio of values (ratio).
When in useβ a When the value is not less than 0, the reaction time is not less than 0,β b =0.025，β c = -0.053；Ka=|β c |/|β b |=2.21
when in useβ b When the value is not less than 0, the reaction time is not less than 0,β a = -0.024，β c = -0.079；Kb=|β c c|/|β a |=3.29
when the temperature is higher than the set temperatureβ c When the value is not less than 0, the reaction time is not less than 0,β a =0.054，β b =0.079；Kc=|β b |/|β a |=1.46
then, the abnormal phase is identified and the diagnosis result is output. Judging a group of data with the smallest historical numerical value proportion as a fault phase, and outputting the fault phase when the data are the same for three timesβ X The calculation data for the failed phase X of =0 is shown in table 1.
TABLE 1 calculation data of a certain substation capacitor based on the diagnostic system of the present invention
Figure 341517DEST_PATH_IMAGE019
The application provides a capacitor bank fault phase diagnosis system, 1) in implementation, 10kV bus three-phase voltage corresponding to a certain capacitor in an SCADA (power grid data acquisition and monitoring control system) and capacitor three-phase current historical data are accessed into the capacitor bank fault phase diagnosis system of the system, an equipment account book module in an equipment management system is opened through a network crawler technology, the parallel connection number of capacitor units in the capacitor bank and the serial reactance rate of an electric reactor are crawled, and therefore accurate and rapid fault diagnosis can be performed on all capacitor banks, and the prior art is the best: the software system of the relay protection device is added, the work needs to be carried out aiming at each capacitor relay protection device, the cost is high, the construction period is long, and meanwhile, the configuration difficulty of the software is increased due to the fact that different capacitor protection manufacturers are different. 2) Because the relay protection device has a short data acquisition period and a small data volume, the capacitor fault location is performed through a small amount of data in the prior art, and the possibility of error diagnosis is high. Therefore, the technical problems of poor accuracy and long time for diagnosing the fault phase of the capacitor bank in the prior art are solved.
The above is a system for diagnosing a fault phase of a capacitor bank provided in the embodiment of the present application, and the following is a method for diagnosing a fault phase of a capacitor bank provided in the embodiment of the present application.
Referring to fig. 2, a method for diagnosing a fault phase of a capacitor bank according to an embodiment of the present application includes:
step 201, obtaining historical data of bus three-phase voltage and capacitor three-phase current, and obtaining the parallel connection number of capacitor units in a capacitor group and the series reactance rate of a reactor;
step 202, performing transformation analysis based on a three-phase impedance calculation formula of the capacitor after the capacitor is subjected to single-phase breakdown, and respectively constructing three phases of the capacitor
Figure 538143DEST_PATH_IMAGE001
A value calculation formula;
step 203, based on three phases
Figure 292473DEST_PATH_IMAGE001
Value calculation formula, which respectively calculates one phase according to historical data, parallel connection number and series reactance rate
Figure 967168DEST_PATH_IMAGE001
Of the other two phases at a value of 0
Figure 490553DEST_PATH_IMAGE001
Values of thereby obtaining three groups
Figure 858080DEST_PATH_IMAGE001
Value data;
step 204, according to three groups
Figure 834127DEST_PATH_IMAGE001
And analyzing the fault phase of the capacitor bank by the value data to obtain the fault phase of the capacitor.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the method described above may refer to the corresponding process in the foregoing system embodiment, and is not described herein again.
The terms "first," "second," "third," "fourth," and the like in the description of the application and the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b and c may be single or plural.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims (6)

1. A capacitor bank fault phase diagnosis system, comprising:
the acquisition unit is used for acquiring historical data of bus three-phase voltage and capacitor three-phase current, and acquiring the parallel connection number of capacitor units in the capacitor bank and the series reactance rate of the reactor;
a construction unit for performing transformation analysis based on the three-phase impedance calculation formula of the capacitor after single-phase breakdown of the capacitor, and respectively constructing three phases of the capacitor
Figure 448917DEST_PATH_IMAGE001
A value calculation formula in which,
Figure 183655DEST_PATH_IMAGE001
is a capacity value variation coefficient;
a computing unit for calculating the three phases
Figure 730174DEST_PATH_IMAGE001
A value calculation formula for respectively calculating one phase according to the historical data, the parallel number and the series reactance rate
Figure 841350DEST_PATH_IMAGE001
Of the other two phases at a value of 0
Figure 789714DEST_PATH_IMAGE001
Values of thereby obtaining three groups
Figure 757670DEST_PATH_IMAGE001
Value data;
an analysis unit for analyzing the three groups
Figure 791485DEST_PATH_IMAGE001
Analyzing the fault phase of the capacitor bank by the value data to obtain the phase of the fault of the capacitor;
the three-phase impedance calculation formula specifically includes:
Figure 440772DEST_PATH_IMAGE002
；
wherein m is the number of the parallel connections, omega is the frequency, C o Is the capacitance value of the capacitor unit, k is the series reactance rate,
Figure 305960DEST_PATH_IMAGE003
、
Figure 382501DEST_PATH_IMAGE004
、
Figure 903612DEST_PATH_IMAGE005
the capacitance value change coefficient of three phases of the capacitor;
the three phases
Figure 91011DEST_PATH_IMAGE001
The value calculation formula specifically includes:
when in use
Figure 76284DEST_PATH_IMAGE006
When there is
Figure 323726DEST_PATH_IMAGE007
；
When in use
Figure 332133DEST_PATH_IMAGE008
When there is
Figure 385540DEST_PATH_IMAGE009
；
When in use
Figure 163003DEST_PATH_IMAGE010
When it comes to
Figure 581346DEST_PATH_IMAGE011
；
In the formula (I), the compound is shown in the specification,
Figure 805611DEST_PATH_IMAGE003
、
Figure 662708DEST_PATH_IMAGE004
、
Figure 294678DEST_PATH_IMAGE005
is the capacity value change coefficient of the three phases of the capacitor,
Figure 883922DEST_PATH_IMAGE012
the number of the parallel-connection is the same as the number of the parallel-connection,
Figure 866922DEST_PATH_IMAGE013
in order to be the cross-talk rate,
Figure 262131DEST_PATH_IMAGE014
the ratio of the phase a impedance to the phase B impedance of the capacitor,
Figure 748607DEST_PATH_IMAGE015
the ratio of the impedance of phase B to the impedance of phase a of the capacitor,
Figure 774332DEST_PATH_IMAGE016
the ratio of the a-phase impedance to the C-phase impedance of the capacitor,
Figure 41365DEST_PATH_IMAGE017
the ratio of the C-phase impedance to the a-phase impedance of the capacitor,
Figure 177948DEST_PATH_IMAGE018
the ratio of the C-phase impedance to the B-phase impedance of the capacitor,
Figure 518931DEST_PATH_IMAGE019
is the ratio of the impedance of the capacitor phase B to the impedance of the capacitor phase C.
2. The system for phase-to-phase fault diagnosis of a capacitor bank of claim 1, wherein the analysis unit is specifically configured to:
calculating one phase of the capacitor separately
Figure 715557DEST_PATH_IMAGE001
At a value of zero, of the other two phases
Figure 407570DEST_PATH_IMAGE001
The ratio of absolute values to obtain the ratio of three phasesThe phase with the smallest value is determined as the phase in which the capacitor has failed.
3. The system according to claim 1, wherein the obtaining unit is specifically configured to:
acquiring historical data of three-phase voltages of a 10kV bus and a 35kV bus and three-phase currents of a capacitor from a power grid data acquisition and monitoring control system;
and opening an equipment ledger module in the equipment management system by a network crawler technology, and crawling the parallel connection number of the capacitor units in the capacitor bank and the series reactance rate of the reactor.
4. A method for diagnosing a fault phase of a capacitor bank is characterized by comprising the following steps:
acquiring historical data of three-phase voltage of a bus and three-phase current of a capacitor, and acquiring the parallel connection number of capacitor units in a capacitor bank and the series reactance rate of a reactor;
performing transformation analysis based on a three-phase impedance calculation formula of the capacitor after the capacitor is subjected to single-phase breakdown, and respectively constructing three phases of the capacitor
Figure 144582DEST_PATH_IMAGE001
A value calculation formula in which,
Figure 605650DEST_PATH_IMAGE001
is a capacity value variation coefficient;
based on said three phases
Figure 973177DEST_PATH_IMAGE001
A value calculation formula for respectively calculating one phase according to the historical data, the parallel number and the series reactance rate
Figure 949224DEST_PATH_IMAGE001
Of the other two phases at a value of 0
Figure 427609DEST_PATH_IMAGE001
Values of thereby obtaining three groups
Figure 8763DEST_PATH_IMAGE001
Value data;
according to the three groups
Figure 343930DEST_PATH_IMAGE001
Analyzing the fault phase of the capacitor bank by the value data to obtain the phase of the fault of the capacitor;
the three-phase impedance calculation formula specifically includes:
Figure 10535DEST_PATH_IMAGE002
；
wherein m is the number of the parallel connections, omega is the frequency, C o Is the capacitance value of the capacitor unit, k is the series reactance rate,
Figure 27032DEST_PATH_IMAGE003
、
Figure 525010DEST_PATH_IMAGE004
、
Figure 962901DEST_PATH_IMAGE005
the capacitance value change coefficient of three phases of the capacitor;
the three phases
Figure 116802DEST_PATH_IMAGE001
The value calculation formula specifically includes:
when in use
Figure 936990DEST_PATH_IMAGE006
When there is
Figure 289474DEST_PATH_IMAGE007
；
When in use
Figure 169706DEST_PATH_IMAGE008
When there is
Figure 545323DEST_PATH_IMAGE009
；
When in use
Figure 903623DEST_PATH_IMAGE010
When there is
Figure 376193DEST_PATH_IMAGE011
；
In the formula (I), the compound is shown in the specification,
Figure 161746DEST_PATH_IMAGE003
、
Figure 24660DEST_PATH_IMAGE004
、
Figure 186651DEST_PATH_IMAGE005
is the capacity value change coefficient of the three phases of the capacitor,
Figure 513727DEST_PATH_IMAGE012
the number of the parallel connection is the same as the number of the parallel connection,
Figure 735761DEST_PATH_IMAGE013
in order to be the cross-talk rate,
Figure 85971DEST_PATH_IMAGE014
the ratio of the phase a impedance to the phase B impedance of the capacitor,
Figure 786074DEST_PATH_IMAGE015
the ratio of the impedance of phase B to the impedance of phase a of the capacitor,
Figure 967657DEST_PATH_IMAGE016
is a phase impedance and a phase impedance of a capacitorThe ratio of (a) to (b),
Figure 360592DEST_PATH_IMAGE017
the ratio of the C-phase impedance to the a-phase impedance of the capacitor,
Figure 198098DEST_PATH_IMAGE018
the ratio of the C-phase impedance to the B-phase impedance of the capacitor,
Figure 764208DEST_PATH_IMAGE019
is the ratio of the impedance of the capacitor phase B to the impedance of the capacitor phase C.
5. The method for diagnosing the phase difference of faults of a capacitor bank as claimed in claim 4, wherein said three groups are defined by
Figure 737981DEST_PATH_IMAGE001
The value data is analyzed to the capacitor bank fault phase to obtain the phase of the capacitor fault, and the method specifically comprises the following steps:
calculating one phase of the capacitor separately
Figure 301817DEST_PATH_IMAGE001
At a value of zero, of the other two phases
Figure 644197DEST_PATH_IMAGE001
And obtaining the ratio of three phases by taking the ratio of absolute values, and determining the phase with the minimum ratio as the phase with the fault capacitor.
6. The method for diagnosing the fault phase of the capacitor bank according to claim 4, wherein the acquiring the number of the parallel capacitor units in the capacitor bank and the series reactance rate of the reactor specifically comprises:
and opening an equipment ledger module in the equipment management system by a network crawler technology, and crawling the parallel connection number of the capacitor units in the capacitor bank and the series reactance rate of the reactor.
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