CN114636952A - System and method for diagnosing fault phase of capacitor bank - Google Patents

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

Info

Publication number
CN114636952A
CN114636952A CN202210536449.4A CN202210536449A CN114636952A CN 114636952 A CN114636952 A CN 114636952A CN 202210536449 A CN202210536449 A CN 202210536449A CN 114636952 A CN114636952 A CN 114636952A
Authority
CN
China
Prior art keywords
capacitor
phase
phases
fault
value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202210536449.4A
Other languages
Chinese (zh)
Other versions
CN114636952B (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
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Foshan Power Supply Bureau of Guangdong Power Grid Corp
Original Assignee
Foshan Power Supply Bureau of Guangdong Power Grid Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Foshan Power Supply Bureau of Guangdong Power Grid Corp filed Critical Foshan Power Supply Bureau of Guangdong Power Grid Corp
Priority to CN202210536449.4A priority Critical patent/CN114636952B/en
Publication of CN114636952A publication Critical patent/CN114636952A/en
Application granted granted Critical
Publication of CN114636952B publication Critical patent/CN114636952B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Data Mining & Analysis (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Analysis (AREA)
  • Computational Mathematics (AREA)
  • Algebra (AREA)
  • Pure & Applied Mathematics (AREA)
  • Databases & Information Systems (AREA)
  • Software Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The application discloses a capacitor bank fault phase diagnosis system and a method, wherein the system comprises: 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 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 state 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 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 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 aWhen =0, there are
Figure 148380DEST_PATH_IMAGE002
；
When the temperature is higher than the set temperatureβ b When =0, there are
Figure 885392DEST_PATH_IMAGE003
；
When the temperature is higher than the set temperatureβ c When =0, have
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, CoIs 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, theThree phases
Figure 725839DEST_PATH_IMAGE001
The value calculation formula specifically includes:
when in useβ aWhen =0, there are
Figure 76049DEST_PATH_IMAGE002
；
When in useβ b When =0, have
Figure 41731DEST_PATH_IMAGE003
；
When in useβ c When =0, have
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 using a web crawler technology, and crawling the parallel connection number of capacitor units and the series reactance rate of the reactor in the capacitor bank.
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, CoIs 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
being three phases of a capacitorThe capacity variation coefficient.
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 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 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: a relay protection device software system is added, the work needs to be carried out on each capacitor relay protection device, the cost is high, the construction period is long, and meanwhile, due to the fact that different capacitor protection manufacturers exist, the configuration difficulty of software is increased. 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.
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 phase-to-phase fault diagnosis method for 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 C0、β b C0、β c C0Then, 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, CoIs the capacitance value of the capacitor unit, k is the series reactance,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 To connectVertical (1) and (2) and finally one of the phases can be calculatedβAt 0, the other two phasesβThe value:
when in useβ aWhen =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, three-phase current historical data, the parallel connection number, and the series impedance ratio 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
At a value of zero, of the other two phases
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 groups of theβTaking 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 the temperature is higher than the set temperatureβ 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 in useβ 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 set of data with the smallest historical value proportionFor the failure phase, outputting the same three times in successionβ X =0, the calculation data 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 provided in 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 simplicity of description, the specific working process of the method described above may refer to the corresponding process in the foregoing system embodiment, and details are 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. Furthermore, 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 single item(s) 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, 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 portable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
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 (10)

1. A capacitor bank fault phase diagnostic 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 951560DEST_PATH_IMAGE001
A value calculation formula in which,
Figure 692114DEST_PATH_IMAGE001
is a capacity value change coefficient;
a computing unit for calculating the three phases
Figure 768655DEST_PATH_IMAGE001
A value calculation formula for calculating one phase according to the historical data, the parallel connection number and the series reactance rate
Figure 788301DEST_PATH_IMAGE001
Of the other two phases at a value of 0
Figure 975700DEST_PATH_IMAGE001
Values of thereby obtaining three groups
Figure 898657DEST_PATH_IMAGE001
Value data;
an analysis unit for analyzing the three groups
Figure 146098DEST_PATH_IMAGE001
Analyzing the fault phase of the capacitor bank by the value data to obtain the fault phase of the capacitorOtherwise.
2. The capacitor bank fault phase-to-phase diagnostic system of claim 1, wherein the three phases are
Figure 216822DEST_PATH_IMAGE001
The value calculation formula specifically includes:
when the temperature is higher than the set temperatureβ aWhen =0, have
Figure 706447DEST_PATH_IMAGE002
；
When in useβ b When =0, there are
Figure 483911DEST_PATH_IMAGE003
；
When in useβ c When =0, there are
Figure 902254DEST_PATH_IMAGE004
；
In the formula (I), the compound is shown in the specification,
Figure 194695DEST_PATH_IMAGE005
、
Figure 989475DEST_PATH_IMAGE006
、
Figure 119980DEST_PATH_IMAGE007
is the capacity value change coefficient of the three phases of the capacitor,
Figure 771541DEST_PATH_IMAGE008
the number of the parallel connection is the same as the number of the parallel connection,
Figure 754541DEST_PATH_IMAGE009
in order to be the cross-talk rate,
Figure 87433DEST_PATH_IMAGE010
is the ratio of the impedances between the two phases of the capacitor,
Figure 636226DEST_PATH_IMAGE011
the ratio of the phase a impedance to the phase B impedance of the capacitor,
Figure 661951DEST_PATH_IMAGE012
is the ratio of the impedance of the capacitor phase B to the impedance of the phase a.
3. 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 365202DEST_PATH_IMAGE001
At a value of zero, of the other two phases
Figure 564103DEST_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.
4. The system according to claim 1, wherein the acquiring 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 using a web crawler technology, and crawling the parallel connection number of capacitor units and the series reactance rate of the reactor in the capacitor bank.
5. The system for diagnosing the phase difference of the capacitor bank fault according to claim 1, wherein the three-phase impedance calculation formula is specifically:
Figure 905085DEST_PATH_IMAGE013
；
wherein m is the number of parallel connections, ω is the frequency, CoIs the capacitance value of the capacitor unit, k is the series reactance rate,
Figure 101711DEST_PATH_IMAGE005
、
Figure 856041DEST_PATH_IMAGE006
、
Figure 530736DEST_PATH_IMAGE007
the capacity value change coefficient of three phases of the capacitor.
6. 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 490339DEST_PATH_IMAGE001
A value calculation formula in which,
Figure 920184DEST_PATH_IMAGE001
is a capacity value variation coefficient;
based on said three phases
Figure 833913DEST_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 312299DEST_PATH_IMAGE001
Of the other two phases at a value of 0
Figure 955770DEST_PATH_IMAGE001
Values of thereby obtaining three groups
Figure 228619DEST_PATH_IMAGE001
Value data;
according to the three groups
Figure 393759DEST_PATH_IMAGE001
And analyzing the fault phase of the capacitor bank by the value data to obtain the fault phase of the capacitor.
7. The method according to claim 6, wherein the three phases are selected from the group consisting of
Figure 472574DEST_PATH_IMAGE001
The value calculation formula specifically includes:
when in useβ aWhen =0, there are
Figure 908234DEST_PATH_IMAGE002
；
When the temperature is higher than the set temperatureβ b When =0, there are
Figure 351985DEST_PATH_IMAGE003
；
When in useβ c When =0, there are
Figure 568203DEST_PATH_IMAGE004
；
In the formula (I), the compound is shown in the specification,
Figure 388391DEST_PATH_IMAGE005
、
Figure 177093DEST_PATH_IMAGE006
、
Figure 119641DEST_PATH_IMAGE007
is the capacity value change coefficient of the three phases of the capacitor,
Figure 495259DEST_PATH_IMAGE008
the number of the parallel connection is the same as the number of the parallel connection,
Figure 853559DEST_PATH_IMAGE009
in order to be the cross-talk rate,
Figure 326129DEST_PATH_IMAGE010
is the ratio of the impedances between the two phases of the capacitor,
Figure 111682DEST_PATH_IMAGE011
the ratio of the phase a impedance to the phase B impedance of the capacitor,
Figure 473131DEST_PATH_IMAGE012
the ratio of the impedance of phase B to the impedance of phase a of the capacitor.
8. The method for diagnosing a faulty phase of a capacitor bank as claimed in claim 6, wherein said three groups are defined by
Figure 635122DEST_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 962198DEST_PATH_IMAGE001
At a value of zero, of the other two phases
Figure 184232DEST_PATH_IMAGE001
And obtaining the ratio of three phases by calculating the ratio of absolute values, and judging the phase with the minimum ratio as the phase with the fault capacitor.
9. The method for diagnosing the fault phase of the capacitor bank according to claim 6, 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.
10. The method for diagnosing the phase difference of the fault of the capacitor bank as recited in claim 6, wherein the three-phase impedance calculation formula is specifically:
Figure 534442DEST_PATH_IMAGE013
wherein m is the number of the parallel connections, omega is the frequency, CoIs the capacitance value of the capacitor unit, k is the series reactance rate,
Figure 733080DEST_PATH_IMAGE005
、
Figure 914663DEST_PATH_IMAGE006
、
Figure 207421DEST_PATH_IMAGE007
the capacity value change coefficient of three phases of the capacitor.
CN202210536449.4A 2022-05-18 2022-05-18 System and method for diagnosing fault phase of capacitor bank Active CN114636952B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210536449.4A CN114636952B (en) 2022-05-18 2022-05-18 System and method for diagnosing fault phase of capacitor bank

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210536449.4A CN114636952B (en) 2022-05-18 2022-05-18 System and method for diagnosing fault phase of capacitor bank

Publications (2)

Publication Number Publication Date
CN114636952A true CN114636952A (en) 2022-06-17
CN114636952B CN114636952B (en) 2022-08-02

Family

ID=81952834

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210536449.4A Active CN114636952B (en) 2022-05-18 2022-05-18 System and method for diagnosing fault phase of capacitor bank

Country Status (1)

Country Link
CN (1) CN114636952B (en)

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10104299A (en) * 1996-10-01 1998-04-24 Takaoka Electric Mfg Co Ltd Abnormality detection method of capacitor facility for power and abnormality detector therefor
CN201222648Y (en) * 2008-06-19 2009-04-15 杨昌兴 Apparatus for protecting and monitoring capacitor set status
US20110057661A1 (en) * 2009-09-08 2011-03-10 Satish Samineni Apparatus and method for identifying a faulted phase in a shunt capacitor bank
CN107037279A (en) * 2016-10-31 2017-08-11 华北电力大学 A kind of shunt capacitor monitoring system and its method
CN107085148A (en) * 2017-03-20 2017-08-22 国网江苏省电力公司无锡供电公司 The online tolerance limit method for early warning and device of a kind of shunt capacitor group
CN108132422A (en) * 2017-12-13 2018-06-08 哈尔滨理工大学 A kind of monitoring system and method for capacitive reactive power compensation device failure
CN108206508A (en) * 2016-12-20 2018-06-26 南京南瑞继保电气有限公司 A kind of adaptive shunt capacitor impedance protecting method
CN108872712A (en) * 2018-05-28 2018-11-23 国网河北省电力有限公司衡水供电分公司 The system and method for shunt capacitor capacitance is calculated under isolated neutral scene
CN109738706A (en) * 2018-12-29 2019-05-10 浙江南德电气有限公司 A kind of capacitor capacitance decaying detection method
CN110967654A (en) * 2019-10-17 2020-04-07 国网浙江省电力有限公司检修分公司 Dry-type hollow series reactor turn-to-turn fault monitoring and protection identification method
CN112198390A (en) * 2020-12-03 2021-01-08 广东电网有限责任公司佛山供电局 Real-time evaluation method and system for health state of capacitor bank
CN113419132A (en) * 2021-08-09 2021-09-21 广东电网有限责任公司 Early warning method and device for capacitor bank fault

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10104299A (en) * 1996-10-01 1998-04-24 Takaoka Electric Mfg Co Ltd Abnormality detection method of capacitor facility for power and abnormality detector therefor
CN201222648Y (en) * 2008-06-19 2009-04-15 杨昌兴 Apparatus for protecting and monitoring capacitor set status
US20110057661A1 (en) * 2009-09-08 2011-03-10 Satish Samineni Apparatus and method for identifying a faulted phase in a shunt capacitor bank
CN107037279A (en) * 2016-10-31 2017-08-11 华北电力大学 A kind of shunt capacitor monitoring system and its method
CN108206508A (en) * 2016-12-20 2018-06-26 南京南瑞继保电气有限公司 A kind of adaptive shunt capacitor impedance protecting method
US20200021104A1 (en) * 2016-12-20 2020-01-16 Nr Electric Co., Ltd An adaptive protection method for impedance of parallel capacitors
CN107085148A (en) * 2017-03-20 2017-08-22 国网江苏省电力公司无锡供电公司 The online tolerance limit method for early warning and device of a kind of shunt capacitor group
CN108132422A (en) * 2017-12-13 2018-06-08 哈尔滨理工大学 A kind of monitoring system and method for capacitive reactive power compensation device failure
CN108872712A (en) * 2018-05-28 2018-11-23 国网河北省电力有限公司衡水供电分公司 The system and method for shunt capacitor capacitance is calculated under isolated neutral scene
CN109738706A (en) * 2018-12-29 2019-05-10 浙江南德电气有限公司 A kind of capacitor capacitance decaying detection method
CN110967654A (en) * 2019-10-17 2020-04-07 国网浙江省电力有限公司检修分公司 Dry-type hollow series reactor turn-to-turn fault monitoring and protection identification method
CN112198390A (en) * 2020-12-03 2021-01-08 广东电网有限责任公司佛山供电局 Real-time evaluation method and system for health state of capacitor bank
CN113419132A (en) * 2021-08-09 2021-09-21 广东电网有限责任公司 Early warning method and device for capacitor bank fault

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
ALI GOODARZI ET AL.: "Online condition monitoring algorithm for element failure detection and fault location in double wye shunt capacitor banks", 《ELECTRICAL POWERANDENERGYSYSTEMS》 *
HESSAMODDIN JOUYBARI-MOGHADDAM ET AL.: "Shunt Capacitor Banks Online Monitoring Using", 《IEEE TRANSACTIONS ON SMART GRID》 *
卢本平: "高压并联电容器的内部元件故障保护分析", 《电力电容器》 *
杨一民: "箱式高压并联电容器电压差动继电保护的探讨", 《电力电容器》 *

Also Published As

Publication number Publication date
CN114636952B (en) 2022-08-02

Similar Documents

Publication Publication Date Title
El-Zonkoly Fault diagnosis in distribution networks with distributed generation
Salehi‐Dobakhshari et al. Application of synchronised phasor measurements to wide‐area fault diagnosis and location
CN107037279B (en) A kind of shunt capacitor monitoring system and method
CN109523165B (en) Voltage sag state estimation method based on limited information
CN108132422A (en) A kind of monitoring system and method for capacitive reactive power compensation device failure
CN113708500B (en) Low-voltage electricity consumption abnormity monitoring system and method
CN111190121A (en) Distributed power supply containing power distribution network fault classification method and system based on sequence components
CN111812451A (en) Phase current transient fault component-based distributed line selection method for power distribution network
CN112485594B (en) Alternating current power grid voltage fault degree detection method and system
CN107167708A (en) A kind of fault detection method, device, equipment and storage medium
CN113419132B (en) Early warning method and device for capacitor bank fault
CN109387728B (en) Single-phase earth fault line selection method and system
Goodarzi et al. Multi‐criteria protection scheme for online element failure detection in shunt capacitor banks
CN117131786B (en) Voltage transformer insulation fault online identification method
Chen et al. Location for single‐phase grounding fault in distribution network based on equivalent admittance distortion rate
Menezes et al. A survey on the application of phasor measurement units to the protection of transmission and smart distribution systems
CN110082596A (en) Distance protection fault impedance calculation method and system based on high frequency transient amount
CN114636952B (en) System and method for diagnosing fault phase of capacitor bank
CN112052620B (en) Intelligent monitoring and analyzing system for urban distribution transformer area
CN114912853B (en) Method and device for evaluating stability of power grid
CN114460409B (en) Capacitor monitoring method, device and equipment based on neutral point unbalance data
CN115184735A (en) Fault phase selection method, system, equipment and terminal for new energy centralized sending line
CN110988520B (en) Waveform analysis method with no error in time scale
JP3479711B2 (en) Power system state determination device
CN113900046A (en) Line zero sequence parameter identification method and device based on wave recording data before and after fault

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant