CN116540038A - Insulation state monitoring method and device for capacitor bank - Google Patents
Insulation state monitoring method and device for capacitor bank Download PDFInfo
- Publication number
- CN116540038A CN116540038A CN202310567893.7A CN202310567893A CN116540038A CN 116540038 A CN116540038 A CN 116540038A CN 202310567893 A CN202310567893 A CN 202310567893A CN 116540038 A CN116540038 A CN 116540038A
- Authority
- CN
- China
- Prior art keywords
- capacitor bank
- multiplying power
- equivalent capacitance
- phase
- monitored
- 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.)
- Pending
Links
- 239000003990 capacitor Substances 0.000 title claims abstract description 147
- 238000009413 insulation Methods 0.000 title claims abstract description 84
- 238000012544 monitoring process Methods 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000002159 abnormal effect Effects 0.000 claims abstract description 28
- 238000004088 simulation Methods 0.000 claims abstract description 17
- 230000008859 change Effects 0.000 claims description 29
- 238000012806 monitoring device Methods 0.000 claims description 9
- 230000005856 abnormality Effects 0.000 claims description 4
- 230000009191 jumping Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses a method and a device for monitoring the insulation state of a capacitor bank, wherein the method comprises the steps of obtaining a circuit structure of the capacitor bank to be monitored, carrying out three-phase circuit modeling according to the circuit structure, generating a capacitor bank model, carrying out insulation state simulation by adopting the capacitor bank model, generating a monitoring current ratio, when receiving scheduling data sent by an external terminal, determining a corresponding equivalent capacitance multiplying power according to the monitoring current ratio and the scheduling data, and judging whether the insulation state of the capacitor bank to be monitored is abnormal or not according to the equivalent capacitance multiplying power and a preset state threshold range, thereby effectively reducing the monitoring cost on the basis of ensuring the monitoring accuracy of the insulation state.
Description
Technical Field
The present invention relates to the field of state monitoring technologies, and in particular, to a method and an apparatus for monitoring an insulation state of a capacitor bank.
Background
With the construction and development of smart power grids, power grid voltage regulation is more and more important, and a capacitor bank is used as the most important voltage regulating equipment, so that the health state of the capacitor bank directly influences the availability of the capacitor bank and indirectly influences the power grid voltage qualification rate.
Therefore, the insulation state of the capacitor bank needs to be mastered in real time, the automatic identification, intelligent diagnosis and early warning of equipment defects are realized, the analysis and diagnosis capability of expert consultation is achieved, basis and support are provided for intelligent operation and maintenance decision-making of equipment, and important engineering application prospects are realized.
However, the means for monitoring the insulation state of the capacitor bank is very few, and the insulation state of the capacitor bank is generally monitored by adding a large amount of monitoring devices, so that the monitoring cost is high.
Disclosure of Invention
The invention provides a method and a device for monitoring the insulation state of a capacitor bank, which solve the technical problems of high monitoring cost in the existing method for monitoring the insulation state of the capacitor bank by adding a large number of monitoring devices.
The invention provides a method for monitoring the insulation state of a capacitor bank, which comprises the following steps:
acquiring a circuit structure of a capacitor bank to be monitored, and carrying out three-phase circuit modeling according to the circuit structure to generate a capacitor bank model;
performing insulation state simulation by adopting the capacitor bank model to generate a monitoring current ratio;
when receiving scheduling data sent by an external terminal, determining corresponding equivalent capacitance multiplying power according to the monitoring current ratio and the scheduling data;
and judging whether the insulation state of the capacitor bank to be monitored is abnormal or not according to the equivalent capacitance multiplying power and a preset state threshold range.
Optionally, the step of generating the monitored current ratio by using the capacitor bank model to perform insulation state simulation includes:
analyzing the capacitor bank model to obtain a plurality of electrical parameters and initial equivalent capacitances corresponding to each phase respectively;
responding to the input equivalent capacitance change multiplying power, and calculating the changed current of a target phase corresponding to the equivalent capacitance change multiplying power by combining the initial equivalent capacitance;
and determining the monitoring current ratio between the target phase and the adjacent phase by adopting the changed current and the equivalent capacitance change multiplying power.
Optionally, when receiving the scheduling data sent by the external terminal, the step of determining the corresponding equivalent capacitance multiplying power according to the monitoring current ratio and the scheduling data includes:
when receiving scheduling data sent by an external terminal, determining source phase and phase current values of the scheduling data;
and calculating the equivalent capacitance multiplying power corresponding to the source phase according to the phase current value and the corresponding monitoring current ratio.
Optionally, the step of determining whether the insulation state of the capacitor bank to be monitored is abnormal according to the equivalent capacitance multiplying power and a preset state threshold range includes:
judging whether the equivalent capacitance multiplying power is in a preset state threshold range or not;
if yes, judging that the insulation state of the capacitor bank to be monitored is normal;
if not, judging that the insulation state of the capacitor bank to be monitored is abnormal.
Optionally, the state threshold range includes two endpoint extrema, the method further comprising:
if the equivalent capacitance multiplying power is not in the state threshold range, calculating a multiplying power difference between the equivalent capacitance multiplying power and each endpoint extremum according to a preset time interval;
if any multiplying power difference value is larger than a preset adjustment threshold value, skipping to execute the step of obtaining the circuit structure of the capacitor bank to be monitored, and carrying out three-phase circuit modeling according to the circuit structure to generate a capacitor bank model;
and if the multiplying power difference value is smaller than or equal to a preset adjustment threshold value, judging that the insulation state of the capacitor bank to be monitored is abnormal.
The invention also provides an insulation state monitoring device of the capacitor bank, comprising:
the information acquisition module is used for acquiring a circuit structure of the capacitor bank to be monitored, and carrying out three-phase circuit modeling according to the circuit structure to generate a capacitor bank model;
the state simulation module is used for performing insulation state simulation by adopting the capacitor bank model and generating a monitoring current ratio;
the equivalent capacitance multiplying power determining module is used for determining the corresponding equivalent capacitance multiplying power according to the monitoring current ratio and the scheduling data when the scheduling data sent by the external terminal are received;
and the insulation state judging module is used for judging whether the insulation state of the capacitor bank to be monitored is abnormal or not according to the equivalent capacitance multiplying power and a preset state threshold range.
Optionally, the state simulation module is specifically configured to:
analyzing the capacitor bank model to obtain a plurality of electrical parameters and initial equivalent capacitances corresponding to each phase respectively;
responding to the input equivalent capacitance change multiplying power, and calculating the changed current of a target phase corresponding to the equivalent capacitance change multiplying power by combining the initial equivalent capacitance;
and determining the monitoring current ratio between the target phase and the adjacent phase by adopting the changed current and the equivalent capacitance change multiplying power.
Optionally, the equivalent capacitance multiplying power determining module is specifically configured to:
when receiving scheduling data sent by an external terminal, determining source phase and phase current values of the scheduling data;
and calculating the equivalent capacitance multiplying power corresponding to the source phase according to the phase current value and the corresponding monitoring current ratio.
Optionally, the insulation state judging module is specifically configured to:
judging whether the equivalent capacitance multiplying power is in a preset state threshold range or not;
if yes, judging that the insulation state of the capacitor bank to be monitored is normal;
if not, judging that the insulation state of the capacitor bank to be monitored is abnormal.
Optionally, the state threshold range includes two endpoint extrema, and the apparatus further includes:
the multiplying power difference calculating module is used for calculating multiplying power differences between the equivalent capacitance multiplying power and the extreme value of each endpoint according to a preset time interval if the equivalent capacitance multiplying power is not in the state threshold range;
the jump module is used for jumping to execute the step of acquiring the circuit structure of the capacitor bank to be monitored and carrying out three-phase circuit modeling according to the circuit structure to generate a capacitor bank model if any multiplying power difference value is larger than a preset adjustment threshold value;
and the abnormality judging module is used for judging that the insulation state of the capacitor bank to be monitored is abnormal if the multiplying power difference value is smaller than or equal to a preset adjustment threshold value.
From the above technical scheme, the invention has the following advantages:
according to the invention, the circuit structure of the capacitor bank to be monitored is obtained, the three-phase circuit modeling is carried out according to the circuit structure, the capacitor bank model is generated, the capacitor bank model is adopted to simulate the insulation state, when the monitoring current ratio is generated and the scheduling data sent by the external terminal are received, the corresponding equivalent capacitance multiplying power is determined according to the monitoring current ratio and the scheduling data, and whether the insulation state of the capacitor bank to be monitored is abnormal or not is judged according to the equivalent capacitance multiplying power and the preset state threshold range, so that the monitoring cost is effectively reduced on the basis of ensuring the monitoring accuracy of the insulation state.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a flowchart of a method for monitoring an insulation state of a capacitor bank according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a capacitor bank according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a method for monitoring an insulation state of a capacitor bank according to a second embodiment of the present invention.
FIG. 4 is a schematic diagram of three phase potentials according to an embodiment of the present invention;
fig. 5 is a block diagram of an insulation state monitoring device for a capacitor bank according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a method and a device for monitoring the insulation state of a capacitor bank, which are used for solving the technical problems that the insulation state of the capacitor bank is monitored in a mode of adding a large number of monitoring devices, and the monitoring cost is high.
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for monitoring an insulation state of a capacitor bank according to an embodiment of the invention.
The invention provides a method for monitoring the insulation state of a capacitor bank, which comprises the following steps:
step 101, obtaining a circuit structure of a capacitor bank to be monitored, and carrying out three-phase circuit modeling according to the circuit structure to generate a capacitor bank model;
the capacitor bank to be monitored refers to a working bank formed by a plurality of capacitors, and the working bank is in two forms of series connection and parallel connection. In the case of series connection, the withstand voltage is the sum of the two, and the capacity is the reciprocal and one-half of the two; in the case of parallel connection, the withstand voltage is the lowest value of the two, and the capacity is the sum of the two. Jian Shandian is said to be an increase in series withstand voltage and a decrease in capacity. The parallel voltage resistance is unchanged, and the capacity is increased.
The circuit configuration refers to a circuit configuration necessary for the capacitor bank to be monitored to realize its function, for example, a circuit configuration in which the capacitor bank is connected in series with the reactor.
In the embodiment of the invention, the circuit structure of the capacitor bank to be monitored can be obtained through laser radar point cloud scanning or image vision and other modes, and meanwhile, the circuit structure is subjected to three-phase circuit modeling by utilizing a circuit theory analysis technology according to the circuit structure, so that a capacitor bank model is generated.
As shown in fig. 2, fig. 2 shows a capacitor bank model generated by modeling a circuit structure in which a capacitor bank is connected in series with a reactor.
The rated reactance rate is x, the capacitance value is C, the capacitance resistance of the capacitor is 1/ωC, the reactance of the reactor is x/ωC, the impedance of the series connection of the rated reactance rate and the capacitor is (1-x)/ωC, and the three-phase equivalent capacitance Ca=Cb=Cc=C/(1-x).
102, performing insulation state simulation by adopting a capacitor bank model to generate a monitoring current ratio;
after the capacitor bank model is established, the capacitor bank model can be subjected to insulation state simulation, and operation simulation is performed on the capacitor bank model in a mode of increasing or reducing the capacitance by k times so as to determine the monitoring current ratio corresponding to the circuit structure under the condition of different multiples.
It should be noted that, for three-phase current, the monitored current ratio is mainly the current ratio after the capacitance value of a certain phase is changed independently, for example, in an ABC three-phase circuit, the current ratio between AB phases after the capacitance value of a phase becomes k times.
Step 103, when receiving the scheduling data sent by the external terminal, determining the corresponding equivalent capacitance multiplying power according to the monitoring current ratio and the scheduling data;
in a power grid system, a plurality of modes for detecting electric parameters such as current and voltage in real time usually exist for a capacitor bank or the whole circuit structure, and the data acquisition cost can be reduced in a data multiplexing mode.
Wherein the scheduling data is the current value of each phase in the three-phase circuit of the capacitor bank.
And 104, judging whether the insulation state of the capacitor bank to be monitored is abnormal or not according to the equivalent capacitance multiplying power and a preset state threshold range.
After determining the equivalent capacitance multiplying power, it can further determine whether the equivalent capacitance multiplying power is within a preset state threshold range, so as to be used as a basis for determining the insulation state of the capacitor bank to be monitored, and determine whether the insulation state of the capacitor bank to be monitored is abnormal.
In the embodiment of the invention, the circuit structure of the capacitor bank to be monitored is obtained, the three-phase circuit modeling is carried out according to the circuit structure, the capacitor bank model is generated, the capacitor bank model is adopted to simulate the insulation state, the monitoring current ratio value is generated, when the scheduling data sent by the external terminal is received, the corresponding equivalent capacitance multiplying power is determined according to the monitoring current ratio value and the scheduling data, and whether the insulation state of the capacitor bank to be monitored is abnormal or not is judged according to the equivalent capacitance multiplying power and the preset state threshold range, so that the monitoring cost is effectively reduced on the basis of ensuring the monitoring accuracy of the insulation state.
Referring to fig. 3, fig. 3 is a flowchart illustrating a method for monitoring an insulation state of a capacitor bank according to a second embodiment of the present invention.
The invention provides a method for monitoring the insulation state of a capacitor bank, which comprises the following steps:
step 201, obtaining a circuit structure of a capacitor bank to be monitored, and carrying out three-phase circuit modeling according to the circuit structure to generate a capacitor bank model;
in the embodiment of the present invention, the implementation process of step 201 is similar to that of step 101, and will not be repeated here.
Step 202, analyzing a capacitor bank model to obtain a plurality of electrical parameters and initial equivalent capacitances corresponding to each phase respectively;
in an embodiment of the present invention, a capacitor bank model, as shown in FIG. 2, is parsed to determine the devices contained thereinThe type of the part is that electric parameters corresponding to various devices are respectively obtained, such as rated reactance rate is x, capacitance value is C, capacitance reactance of a capacitor is 1/omega C, reactance of a reactor is x/omega C, impedance of series connection of the two is (1-x)/omega C, and initial equivalent capacitance C corresponding to three phases is obtained a ＝C b ＝C c ＝C/(1-x)。
It should be noted that, according to the KCL theorem, it is known that:
wherein,,for the voltage vector of phase a>Is the voltage vector of n points, ">For the voltage vector of phase b, +.>Is the voltage vector of phase c.
Step 203, responding to the input equivalent capacitance change multiplying power, and calculating the changed current of the target phase corresponding to the equivalent capacitance change multiplying power by combining the initial equivalent capacitance;
in the embodiment of the invention, the change current of the target phase corresponding to the change rate of the equivalent capacitance can be calculated by combining the initial equivalent capacitance in response to the change rate of the equivalent capacitance input by an external terminal or a user.
For example, if the a phase is the target phase and the equivalent capacitance change magnification is k, C is present before the change a ＝C b ＝C c 。
The calculation process may be as follows:
∵
∴and I a ＝U a ωC a
∴
Wherein I is a The current value before the change of the phase a before the change of the capacitance by k times,u is the current vector before changing the capacitance of the a phase by k times n U is the voltage value of n points before the capacitance is changed by k times a For phase a, the voltage value before the capacitance change is k times,/, for phase a>For the changed current vector of phase a after the capacitance is changed by k times, C' a The capacitance value is k times after a phase change.
204, determining a monitoring current ratio between a target phase and an adjacent phase by adopting the changed current and an equivalent capacitance change multiplying power;
referring to fig. 4, fig. 4 is a schematic diagram of three-phase potentials.
In this embodiment, the ratio of the monitored current between the target phase and the adjacent phase can be determined by using the changed current in combination with the equivalent capacitance change rate, which is specifically as follows:
U bn 2 ＝U a 2 +U n 2 -2U a ×U n ×cos120°
wherein I' b For the current value after changing the capacitance of phase b by k times, I' a U is the current value after changing the capacitance of the phase a by k times bn Is the voltage value between the b and n points.
Therefore, when the change multiplying power of the equivalent capacitance of the a-phase capacitor is k, the monitored current ratio between the ab phases is as follows:
it should be noted that, the above is only to take the monitored current ratio between ab phases as an example, and the specific calculation process of the monitored current ratio between corresponding bc phases or ac phases may refer to the above calculation process, which is not repeated in the embodiments of the present invention.
Step 205, when receiving the scheduling data sent by the external terminal, determining the corresponding equivalent capacitance multiplying power according to the monitoring current ratio and the scheduling data;
optionally, step 205 may comprise the sub-steps of:
when receiving scheduling data sent by an external terminal, determining source phase and phase current values of the scheduling data;
and calculating the equivalent capacitance multiplying power corresponding to the source phase according to the phase current value and the corresponding monitoring current ratio.
In the embodiment of the invention, when receiving the scheduling data sent by the external terminal, the source phase and the corresponding phase current value corresponding to the positioning data can be positioned, namely, the source phase is determined to be a phase, b phase or c phase, and the corresponding phase current value is determined.
Substituting the phase current value into the monitoring current ratio, and calculating the equivalent capacitance multiplying power k corresponding to the source phase.
The capacitor current data is stored in E format file in the dispatching system, SFTP service is established, data access is opened to the on-line monitoring system, and the on-line monitoring system analyzes the received E format file and writes the E format file into the database. The E-format file is specifically described as follows:
the dispatching automation system (EMS system) periodically inquires information of monitoring points of the transformer substation at fixed time intervals, wherein the information comprises data such as site information of the transformer substation, information of measuring points, values of measuring points, time points, latest current, voltage and the like of a main network. The automation department obtains telemetry data, txt file format. The capacitor monitoring system is deployed in a test house, directly interacts with the scheduling department sftp data interface and transmits the data in a text file mode. The telemetry data is stored in a txt file format, and the specific format is as follows: transformer station name + measurement station ID + measurement value + data time.
For example:
capacitor 53AC switch ME-805 0 2022/3/21 0:00:08 in 10kV#3A in the south of the Yangtze river
The analyzed information is: indicating that the switch state of capacitor 53AC switch (monitoring point id: ME-805) at 10kV#3A at the south of the Yangtze river is 0 at 2022/3/21 0:00:08.
Three-river 10kV#2B capacitor B phase current ME-716741.085 2018/1/1:0:00:03
The analyzed information is: the current value at the moment 2018/1/1:0:00:03 of the phase B current (monitoring point id: ME-716741) of the capacitor B of 10 kV#2of the Sanjiang station is 0.085.
And 206, judging whether the insulation state of the capacitor bank to be monitored is abnormal or not according to the equivalent capacitance multiplying power and a preset state threshold range.
Optionally, step 206 may include the sub-steps of:
judging whether the equivalent capacitance multiplying power is in a state threshold range or not;
if yes, judging that the insulation state of the capacitor bank to be monitored is normal;
if not, judging that the insulation state of the capacitor bank to be monitored is abnormal.
In the embodiment of the invention, whether the equivalent capacitance multiplying power is in the state threshold range is judged, if so, the capacitance value of the capacitor bank to be monitored is still in the qualified range, and the insulation state of the capacitor bank to be monitored can be judged to be normal. If the capacitor bank to be monitored is not in the qualified range, the capacitor bank to be monitored is changed beyond the range, and the insulation state of the capacitor bank to be monitored can be judged to be abnormal.
In a specific implementation, the qualified range of the capacitance value is +/-5%, and assuming that the reactance rate x=5%, the qualified range of k can be obtained to be 95.25% -104.75% according to Ca=C/(1-x), and the corresponding current ratio is 0.9755-1.0231.
Further, the state threshold range includes two endpoint extrema, the method further comprising:
if the equivalent capacitance multiplying power is not in the state threshold range, calculating the multiplying power difference between the equivalent capacitance multiplying power and each endpoint extremum according to a preset time interval;
if any multiplying power difference value is larger than a preset adjustment threshold value, skipping to execute the step of obtaining the circuit structure of the capacitor bank to be monitored, and carrying out three-phase circuit modeling according to the circuit structure to generate a capacitor bank model;
if the multiplying power difference value is smaller than or equal to a preset adjustment threshold value, judging that the insulation state of the capacitor bank to be monitored is abnormal.
In another example of the present invention, the state threshold range includes two extreme values, namely a maximum value and a minimum value, when it is determined that the equivalent capacitance magnification is not within the state threshold range, this indicates that there may be an abnormality in the insulation state of the capacitor bank to be monitored.
However, in the long-term operation of the capacitor bank, since the embodiment of the invention does not need a monitoring device, the circuit structure of the capacitor bank to be monitored cannot be monitored in real time, at this time, the circuit structure is possibly changed, the equivalent capacitance multiplying power actually meets the requirement, but the circuit structure cannot be acquired in real time, and judgment deviation occurs. At this time, the multiplying power difference between the equivalent capacitance multiplying power and each endpoint extremum can be calculated according to a preset time interval, if any multiplying power difference is greater than a preset adjustment threshold, step 201-206 is skipped to execute, and modeling and judgment are performed on the capacitor bank to be monitored again. If the multiplying power difference is smaller than or equal to a preset adjustment threshold, judging that the insulation state of the capacitor bank to be monitored is abnormal.
In the embodiment of the invention, the circuit structure of the capacitor bank to be monitored is obtained, the three-phase circuit modeling is carried out according to the circuit structure, the capacitor bank model is generated, the capacitor bank model is adopted to simulate the insulation state, the monitoring current ratio value is generated, when the scheduling data sent by the external terminal is received, the corresponding equivalent capacitance multiplying power is determined according to the monitoring current ratio value and the scheduling data, and whether the insulation state of the capacitor bank to be monitored is abnormal or not is judged according to the equivalent capacitance multiplying power and the preset state threshold range, so that the monitoring cost is effectively reduced on the basis of ensuring the monitoring accuracy of the insulation state.
Referring to fig. 5, fig. 5 shows a block diagram of an insulation state monitoring device for a capacitor bank according to an embodiment of the invention.
The invention also provides an insulation state monitoring device of the capacitor bank, comprising:
the information acquisition module 501 is configured to acquire a circuit structure of a capacitor bank to be monitored, and perform three-phase circuit modeling according to the circuit structure to generate a capacitor bank model;
the state simulation module 502 is configured to perform insulation state simulation by using a capacitor bank model, and generate a monitored current ratio;
the equivalent capacitance multiplying power determining module 503 is configured to determine, when receiving the scheduling data sent by the external terminal, a corresponding equivalent capacitance multiplying power according to the monitored current ratio and the scheduling data;
the insulation state judging module 504 is configured to judge whether the insulation state of the capacitor bank to be monitored is abnormal according to the equivalent capacitance ratio and a preset state threshold range.
Optionally, the state simulation module 502 is specifically configured to:
analyzing the capacitor bank model to obtain a plurality of electrical parameters and initial equivalent capacitances corresponding to the phases respectively;
responding to the input equivalent capacitance change multiplying power, and calculating the changed current of the target phase corresponding to the equivalent capacitance change multiplying power by combining the initial equivalent capacitance;
and determining the monitoring current ratio between the target phase and the adjacent phase by adopting the changed current and the equivalent capacitance change multiplying power.
Optionally, the equivalent capacitance multiplying power determining module 503 is specifically configured to:
when receiving scheduling data sent by an external terminal, determining source phase and phase current values of the scheduling data;
and calculating the equivalent capacitance multiplying power corresponding to the source phase according to the phase current value and the corresponding monitoring current ratio.
Optionally, the insulation state determining module 504 is specifically configured to:
judging whether the equivalent capacitance multiplying power is in a preset state threshold range or not;
if yes, judging that the insulation state of the capacitor bank to be monitored is normal;
if not, judging that the insulation state of the capacitor bank to be monitored is abnormal.
Optionally, the state threshold range includes two endpoint extrema, and the apparatus further includes:
the multiplying power difference calculating module is used for calculating multiplying power differences between the equivalent capacitance multiplying power and extreme values of all endpoints according to preset time intervals if the equivalent capacitance multiplying power is not in the state threshold range;
the jump module is used for jumping to execute the steps of acquiring the circuit structure of the capacitor bank to be monitored and carrying out three-phase circuit modeling according to the circuit structure to generate a capacitor bank model if any multiplying power difference value is larger than a preset adjustment threshold value;
and the abnormality judging module is used for judging that the insulation state of the capacitor bank to be monitored is abnormal if the multiplying power difference value is smaller than or equal to a preset adjustment threshold value.
It will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the apparatus and modules described above may refer to the corresponding process in the foregoing method embodiment, which is not repeated herein.
In the several embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown 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 may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for monitoring the insulation state of a capacitor bank, comprising:
acquiring a circuit structure of a capacitor bank to be monitored, and carrying out three-phase circuit modeling according to the circuit structure to generate a capacitor bank model;
performing insulation state simulation by adopting the capacitor bank model to generate a monitoring current ratio;
when receiving scheduling data sent by an external terminal, determining corresponding equivalent capacitance multiplying power according to the monitoring current ratio and the scheduling data;
and judging whether the insulation state of the capacitor bank to be monitored is abnormal or not according to the equivalent capacitance multiplying power and a preset state threshold range.
2. The method of claim 1, wherein the step of generating a monitored current ratio using the capacitor bank model for insulation state simulation comprises:
analyzing the capacitor bank model to obtain a plurality of electrical parameters and initial equivalent capacitances corresponding to each phase respectively;
responding to the input equivalent capacitance change multiplying power, and calculating the changed current of a target phase corresponding to the equivalent capacitance change multiplying power by combining the initial equivalent capacitance;
and determining the monitoring current ratio between the target phase and the adjacent phase by adopting the changed current and the equivalent capacitance change multiplying power.
3. The method according to claim 1, wherein the step of determining the corresponding equivalent capacitance ratio according to the monitored current ratio and the schedule data when the schedule data transmitted by the external terminal is received, comprises:
when receiving scheduling data sent by an external terminal, determining source phase and phase current values of the scheduling data;
and calculating the equivalent capacitance multiplying power corresponding to the source phase according to the phase current value and the corresponding monitoring current ratio.
4. The method of claim 1, wherein the step of determining whether the insulation state of the capacitor bank to be monitored is abnormal according to the equivalent capacitance ratio and a preset state threshold range comprises:
judging whether the equivalent capacitance multiplying power is in a preset state threshold range or not;
if yes, judging that the insulation state of the capacitor bank to be monitored is normal;
if not, judging that the insulation state of the capacitor bank to be monitored is abnormal.
5. The method of any of claims 1-4, wherein the state threshold range includes two endpoint extrema, the method further comprising:
if the equivalent capacitance multiplying power is not in the state threshold range, calculating a multiplying power difference between the equivalent capacitance multiplying power and each endpoint extremum according to a preset time interval;
if any multiplying power difference value is larger than a preset adjustment threshold value, skipping to execute the step of obtaining the circuit structure of the capacitor bank to be monitored, and carrying out three-phase circuit modeling according to the circuit structure to generate a capacitor bank model;
and if the multiplying power difference value is smaller than or equal to a preset adjustment threshold value, judging that the insulation state of the capacitor bank to be monitored is abnormal.
6. An insulation state monitoring device of a capacitor bank, comprising:
the information acquisition module is used for acquiring a circuit structure of the capacitor bank to be monitored, and carrying out three-phase circuit modeling according to the circuit structure to generate a capacitor bank model;
the state simulation module is used for performing insulation state simulation by adopting the capacitor bank model and generating a monitoring current ratio;
the equivalent capacitance multiplying power determining module is used for determining the corresponding equivalent capacitance multiplying power according to the monitoring current ratio and the scheduling data when the scheduling data sent by the external terminal are received;
and the insulation state judging module is used for judging whether the insulation state of the capacitor bank to be monitored is abnormal or not according to the equivalent capacitance multiplying power and a preset state threshold range.
7. The apparatus of claim 6, wherein the state simulation module is specifically configured to:
analyzing the capacitor bank model to obtain a plurality of electrical parameters and initial equivalent capacitances corresponding to each phase respectively;
responding to the input equivalent capacitance change multiplying power, and calculating the changed current of a target phase corresponding to the equivalent capacitance change multiplying power by combining the initial equivalent capacitance;
and determining the monitoring current ratio between the target phase and the adjacent phase by adopting the changed current and the equivalent capacitance change multiplying power.
8. The device according to claim 6, wherein the equivalent capacitance multiplying power determining module is specifically configured to:
when receiving scheduling data sent by an external terminal, determining source phase and phase current values of the scheduling data;
and calculating the equivalent capacitance multiplying power corresponding to the source phase according to the phase current value and the corresponding monitoring current ratio.
9. The apparatus of claim 6, wherein the insulation state determination module is specifically configured to:
judging whether the equivalent capacitance multiplying power is in a preset state threshold range or not;
if yes, judging that the insulation state of the capacitor bank to be monitored is normal;
if not, judging that the insulation state of the capacitor bank to be monitored is abnormal.
10. The apparatus of any of claims 6-9, wherein the state threshold range includes two endpoint extrema, the apparatus further comprising:
the multiplying power difference calculating module is used for calculating multiplying power differences between the equivalent capacitance multiplying power and the extreme value of each endpoint according to a preset time interval if the equivalent capacitance multiplying power is not in the state threshold range;
the jump module is used for jumping to execute the step of acquiring the circuit structure of the capacitor bank to be monitored and carrying out three-phase circuit modeling according to the circuit structure to generate a capacitor bank model if any multiplying power difference value is larger than a preset adjustment threshold value;
and the abnormality judging module is used for judging that the insulation state of the capacitor bank to be monitored is abnormal if the multiplying power difference value is smaller than or equal to a preset adjustment threshold value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310567893.7A CN116540038A (en) | 2023-05-19 | 2023-05-19 | Insulation state monitoring method and device for capacitor bank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310567893.7A CN116540038A (en) | 2023-05-19 | 2023-05-19 | Insulation state monitoring method and device for capacitor bank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116540038A true CN116540038A (en) | 2023-08-04 |
Family
ID=87455836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310567893.7A Pending CN116540038A (en) | 2023-05-19 | 2023-05-19 | Insulation state monitoring method and device for capacitor bank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116540038A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117825899A (en) * | 2024-03-06 | 2024-04-05 | 江苏丹通电气有限公司 | Insulation state monitoring method for capacitor bank |
-
2023
- 2023-05-19 CN CN202310567893.7A patent/CN116540038A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117825899A (en) * | 2024-03-06 | 2024-04-05 | 江苏丹通电气有限公司 | Insulation state monitoring method for capacitor bank |
| CN117825899B (en) * | 2024-03-06 | 2024-05-10 | 江苏丹通电气有限公司 | Insulation state monitoring method for capacitor bank |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Mohsenian-Rad et al. | Distribution synchrophasors: Pairing big data with analytics to create actionable information | |
| CN107462863B (en) | Operation error operation diagnosis and analysis method and system for intelligent electric energy meter | |
| US11914355B2 (en) | System for determining electric parameters of an electric power grid | |
| CN115166500B (en) | DC breaker equipment state analysis system based on power grid resource business center | |
| CN110879543B (en) | Real-time hybrid simulation platform of electric power system | |
| EP3958194B1 (en) | Method and device for assessing state of health of transformer, and storage medium | |
| CN103296750B (en) | Apparatus and method for correcting error of acquired data | |
| CN113169709A (en) | Solar power generation control system and method based on machine learning | |
| CN116540038A (en) | Insulation state monitoring method and device for capacitor bank | |
| US20220308573A1 (en) | System and method for predicting failure in a power system in real-time | |
| CN105093047A (en) | Electric power line current-carrying capacity monitoring and early warning system | |
| US11442085B2 (en) | Method and system for monitoring the operating state of an energy supply network | |
| Deboever et al. | Practical data-driven methods to improve the accuracy and detail of hosting capacity analysis | |
| KR20100037317A (en) | Multiple facts control system and method therefor | |
| CN117639228A (en) | Power distribution network running state prediction method and system based on digital twin | |
| CN105676013A (en) | System and method for testing unit running status monitoring function of wide-area measurement system | |
| CN112714991A (en) | Determination of microgrid toughness | |
| EP3651296A1 (en) | System operation support device and method in power system, and wide-area monitoring protection control system | |
| Brosinsky et al. | HVAC/HVDC Control Center-Test and Demonstrator System | |
| CN109655681A (en) | A kind of substation and switchyard double measurement circuit method for detecting abnormality and system | |
| US10739765B2 (en) | Method for enriching data in measurement data records of a low-voltage network | |
| EP3136535A1 (en) | Apparatus and method of measuring data in high voltage direct current system | |
| CN113640733A (en) | Platform area load reduction simulation system and use method thereof | |
| Kotsalos et al. | On the development of a framework for the advanced monitoring of LV grids | |
| KR101674402B1 (en) | power dissipation measurement algorithm and equipment |
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 |