CN113075511A - Line insulation monitoring method, system and device based on distributed fault recording - Google Patents

Line insulation monitoring method, system and device based on distributed fault recording Download PDF

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Publication number
CN113075511A
CN113075511A CN202110344277.6A CN202110344277A CN113075511A CN 113075511 A CN113075511 A CN 113075511A CN 202110344277 A CN202110344277 A CN 202110344277A CN 113075511 A CN113075511 A CN 113075511A
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China
Prior art keywords
fault
insulation
line
time
coefficient
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CN202110344277.6A
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Inventor
毛新宇
马兴明
郎宇宁
陈立明
王丽娜
孙国强
曾程
赵双
崔泰琰
张冬
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Daqing Power Supply Co Of State Grid Heilongjiang Electric Power Co ltd
State Grid Corp of China SGCC
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Daqing Power Supply Co Of State Grid Heilongjiang Electric Power Co ltd
State Grid Corp of China SGCC
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Priority to CN202110344277.6A priority Critical patent/CN113075511A/en
Publication of CN113075511A publication Critical patent/CN113075511A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—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
    • G01R31/1263—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 of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
    • G01R31/1272—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 of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
    • 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
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • 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
    • G01R31/58—Testing of lines, cables or conductors

Abstract

The invention discloses a line insulation monitoring method, a system and a device based on distributed fault recording, wherein the line insulation monitoring method comprises the following steps: recording the occurrence of the instantaneous ground fault and selecting a ground fault line; calling fault recording data, and searching the number of times of transient faults occurring on a fault line and the duration time of each fault within set time; if the fault line has a permanent earth fault within the set time, the search time range is changed into the time from the last permanent fault to the current time; calculating the insulation coefficient of the fault line according to the fault recording data; and if the insulation coefficient is larger than 1, reporting insulation early warning information. The method and the device can directly utilize the fault recording data to evaluate the insulation state of the line, and solve the problems that the evaluation result of the insulation state of the distribution line is not accurate enough and the reliability of the evaluation result is not high enough in the prior art.

Description

Line insulation monitoring method, system and device based on distributed fault recording
Technical Field
The invention relates to a line insulation monitoring method, system and device based on distributed fault recording, and belongs to the technical field of power distribution network fault detection.
Background
The single-phase earth fault and even the electric shock of a human body caused by the insulation aging of the cable seriously jeopardizes the safe and reliable operation of the power distribution network, accurately masters the insulation state of the cable and has important significance for ensuring the safe and reliable operation of the power distribution network. Therefore, the insulation state monitoring of the cable line is an important content for safe and reliable power supply.
The fault recorder is a device capable of automatically recording when a power system has faults and oscillations, and can record system current, voltage and derived quantities thereof, such as active, reactive and system frequency whole-process change phenomena, caused by large disturbances such as short circuit faults, system oscillations, frequency breakdown, voltage breakdown and the like. The method is mainly used for detecting the action behaviors of the relay protection and safety automatic device, knowing the change rule of each electrical parameter of the system in the transient process of the system and checking the correctness of the calculation program and the model parameter of the power system. The fault recording is an important basis for analyzing system faults, and along with the improvement of requirements on power supply reliability of a power distribution network, the quick tripping performance is not only required to be protected for line faults, but also the fault reasons are required to be traced and analyzed, the insulation monitoring and early warning of the line are actively carried out, an insulation state evaluation system of the power distribution line is established, the insulation state of the power distribution line is evaluated, and therefore potential risks are timely eliminated.
The existing line insulation monitoring method is characterized in that whether a cable is aged or not is judged by operation experience and needs to be replaced, the judgment standard cannot be universal under different voltage levels and different operation conditions, and extra online measurement equipment is required to be added, so that the accurate judgment of the ground insulation parameters of the cable is complicated, and the existing method is complex to realize.
Disclosure of Invention
In order to solve the problems, the invention provides a line insulation monitoring method, a system and a device based on distributed fault recording, which can directly utilize fault recording data to evaluate the insulation state of a line so as to solve the problems that the evaluation result of the insulation state of a distribution line is not accurate and the reliability of the evaluation result is not high in the prior art.
The technical scheme adopted for solving the technical problems is as follows:
in a first aspect, a method for calculating an insulation coefficient of a faulty line provided in an embodiment of the present invention includes the following steps:
acquiring fault recording data of the instantaneous ground fault;
calculating the insulation factor lambda of the fault line by using the following formulai：
Figure BDA0002999071490000021
Wherein: lambda [ alpha ]iThe insulation coefficient of a fault line i with an instantaneous ground fault; rho is a weight coefficient of the fault frequency insulation early warning coefficient; n isiThe number of instantaneous earth faults of the line in a certain time T; n is the expected insulation early warning transient fault frequency; dikFor the duration of each fault; d is a time threshold for judging permanent faults; and T is the search time range.
In a second aspect, a line insulation monitoring method based on distributed fault recording provided in an embodiment of the present invention includes the following steps:
recording the occurrence of the instantaneous ground fault and selecting a ground fault line;
calling fault recording data, and searching the number of times of transient faults occurring on a fault line and the duration time of each fault within set time; if the fault line has a permanent earth fault within the set time, the search time range is changed into the time from the last permanent fault to the current time;
calculating the insulation coefficient of the fault line according to the fault recording data;
and if the insulation coefficient is larger than 1, reporting insulation early warning information.
As a possible implementation manner of this embodiment, the calculating an insulation coefficient of the fault line according to the fault recording data specifically includes:
calculating the insulation factor lambda of the fault line by using the following formulai：
Figure BDA0002999071490000031
Wherein: lambda [ alpha ]iThe insulation coefficient of a fault line i with an instantaneous ground fault; rho is a weight coefficient of the fault frequency insulation early warning coefficient; n isiThe number of instantaneous earth faults of the line in a certain time T; n is the expected insulation early warning transient fault frequency; dikFor the duration of each fault; d is a time threshold for judging permanent faults; and T is the search time range.
In a third aspect, a line insulation monitoring system based on distributed fault recording provided in an embodiment of the present invention includes:
the ground fault line selection module is used for recording the occurrence of the instantaneous ground fault and selecting a ground fault line;
the fault recording data calling module is used for calling fault recording data and searching the number of times of transient faults occurring on a fault line and the duration time of each fault within set time; if the fault line has a permanent earth fault within the set time, the search time range is changed into the time from the last permanent fault to the current time;
the insulation coefficient calculation module is used for calculating the insulation coefficient of the fault line according to the fault recording data;
and the insulation early warning module is used for reporting insulation early warning information if the insulation coefficient is greater than 1.
As a possible implementation manner of this embodiment, the insulation factor calculation module is configured to calculate the insulation factor λ of the faulty line by using the following formulai：
Figure BDA0002999071490000032
Wherein: lambda [ alpha ]iThe insulation coefficient of a fault line i with an instantaneous ground fault; rho is a weight coefficient of the fault frequency insulation early warning coefficient; n isiThe number of instantaneous earth faults of the line in a certain time T; n is the expected insulation early warning transient fault frequency; dikFor the duration of each fault; d is a time threshold for judging permanent faults; and T is the search time range.
In a fourth aspect, the line insulation monitoring device based on distributed fault recording provided in the embodiments of the present invention includes a monitoring controller for implementing the method, where an input end of the monitoring controller is connected with fault recording data used after an instantaneous ground fault occurs to a power distribution network system.
As a possible implementation manner of this embodiment, the monitoring controller includes a data storage and analysis module, an analog input and conditioning module, a remote signaling input and output module, a time synchronization module, and a communication module; the data storage and analysis module is connected with the analog input conditioning module, the time synchronization module and the communication module and is used for processing, analyzing and storing data; the analog quantity input conditioning module is used for inputting voltage and current analog quantities; the remote signaling input and output module is used for inputting or outputting switch node information; the time synchronization module is used for receiving GPS or Beidou time synchronization signals; the communication module is used for carrying out communication interaction with other equipment.
The technical scheme of the embodiment of the invention has the following beneficial effects:
by using the line insulation monitoring method based on distributed fault recording, the insulation state of the line can be evaluated by directly using fault recording data, and the problems that the evaluation result of the insulation state of the distribution line is not accurate and the reliability of the evaluation result is not high in the prior art are solved.
The invention can directly utilize the fault recording data to evaluate the insulation state of the line and carry out early warning by conveniently installing the distributed fault recording device. The device is small in size and convenient to install, can analyze data in real time, uploads the data through the communication interface, facilitates timely processing of operating personnel, can arrange a maintenance plan in advance for maintenance of a circuit, and reduces unnecessary power failure.
Description of the drawings:
fig. 1 is a flow chart illustrating a distributed fault recording based line insulation monitoring method according to an exemplary embodiment;
FIG. 2 is a block diagram of a distributed fault recording based line insulation monitoring system according to an exemplary embodiment;
fig. 3 is a flow chart of line insulation monitoring by using the line insulation monitoring device based on distributed fault recording of the present invention.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
in order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and procedures are omitted so as to not unnecessarily limit the invention.
Fig. 1 is a flowchart illustrating a distributed fault recording based line insulation monitoring method according to an exemplary embodiment. As shown in fig. 1, a line insulation monitoring method based on distributed fault recording according to an embodiment of the present invention includes the following steps:
recording the occurrence of the instantaneous ground fault and selecting a ground fault line;
calling fault recording data, and searching the number of times of transient faults occurring on a fault line and the duration time of each fault within set time; if the fault line has a permanent earth fault within the set time, the search time range is changed into the time from the last permanent fault to the current time;
calculating the insulation coefficient of the fault line according to the fault recording data;
and if the insulation coefficient is larger than 1, reporting insulation early warning information.
As a possible implementation manner of this embodiment, the calculating an insulation coefficient of the fault line according to the fault recording data specifically includes:
calculating the insulation factor lambda of the fault line by using the following formulai：
Figure BDA0002999071490000051
Wherein: lambda [ alpha ]iThe insulation coefficient of a fault line i with an instantaneous ground fault; rho is a weight coefficient of the fault frequency insulation early warning coefficient; n isiFor the instantaneous earth fault times of the line within a certain time TCounting; n is the expected insulation early warning transient fault frequency; dikFor the duration of each fault; d is a time threshold for judging permanent faults; and T is the search time range.
As shown in fig. 2, a line insulation monitoring system based on distributed fault recording provided in an embodiment of the present invention includes:
the ground fault line selection module is used for recording the occurrence of the instantaneous ground fault and selecting a ground fault line;
the fault recording data calling module is used for calling fault recording data and searching the number of times of transient faults occurring on a fault line and the duration time of each fault within set time; if the fault line has a permanent earth fault within the set time, the search time range is changed into the time from the last permanent fault to the current time;
the insulation coefficient calculation module is used for calculating the insulation coefficient of the fault line according to the fault recording data;
and the insulation early warning module is used for reporting insulation early warning information if the insulation coefficient is greater than 1.
As a possible implementation manner of this embodiment, the insulation factor calculation module is configured to calculate the insulation factor λ of the faulty line by using the following formulai：
Figure BDA0002999071490000061
Wherein: lambda [ alpha ]iThe insulation coefficient of a fault line i with an instantaneous ground fault; rho is a weight coefficient of the fault frequency insulation early warning coefficient; n isiThe number of instantaneous earth faults of the line in a certain time T; n is the expected insulation early warning transient fault frequency; dikFor the duration of each fault; d is a time threshold for judging permanent faults; and T is the search time range.
The line insulation monitoring device based on the distributed fault recording comprises a monitoring controller for realizing the method, wherein the input end of the monitoring controller is connected with fault recording data used for generating transient ground faults on a power distribution network system.
As a possible implementation manner of this embodiment, the monitoring controller includes a data storage and analysis module, an analog input and conditioning module, a remote signaling input and output module, a time synchronization module, and a communication module; the data storage and analysis module is connected with the analog input conditioning module, the time synchronization module and the communication module and is used for processing, analyzing and storing data; the analog quantity input conditioning module is used for inputting voltage and current analog quantities; the remote signaling input and output module is used for inputting or outputting switch node information; the time synchronization module is used for receiving GPS or Beidou time synchronization signals; the communication module is used for carrying out communication interaction with other equipment.
As shown in fig. 3, the process of monitoring the line insulation by using the line insulation monitoring device based on distributed fault recording of the present invention includes the following steps:
step one, recording the occurrence of the instantaneous ground fault, and starting an insulation early warning calculation program of a fault line after selecting a ground fault line (set as a line i).
Step two, calling fault recording data, and searching the number n of transient faults occurring in the fault line i once within the set time TiAnd duration of each fault dik(ii) a If the fault line i has a permanent earth fault within the time T, the search time range is changed to the time from the last permanent fault to the current time
Step three, calculating the insulation coefficient of the fault line i
Figure BDA0002999071490000071
Wherein: rho is a weight coefficient of the fault frequency insulation early warning coefficient and is generally set to be 0.85;
nithe number of instantaneous earth faults of the line in a certain time T;
n is the expected insulation early warning transient fault frequency;
dikfor the duration of each fault;
d is a time threshold for judging permanent faults;
and T is the search time range.
Step four, if lambdaiAnd reporting the insulation early warning information if the number is more than or equal to 1.
The invention provides a line insulation monitoring algorithm based on a distributed fault recording device, which can directly evaluate the insulation state of a line by utilizing fault recording data so as to solve the problems that the evaluation result of the insulation state of a distribution line is not accurate and the reliability of the evaluation result is not high in the prior art.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims (7)

1. A method for calculating the insulation coefficient of a fault line is characterized by comprising the following steps:
acquiring fault recording data of the instantaneous ground fault;
calculating the insulation factor lambda of the fault line by using the following formulai：
Figure FDA0002999071480000011
Wherein: lambda [ alpha ]iThe insulation coefficient of a fault line i with an instantaneous ground fault; rho is a weight coefficient of the fault frequency insulation early warning coefficient; n isiThe number of instantaneous earth faults of the line in a certain time T; n is the expected insulation early warning transient fault frequency; dikFor the duration of each fault; d is a time threshold for judging permanent faults;and T is the search time range.
2. A line insulation monitoring method based on distributed fault recording is characterized by comprising the following steps:
recording the occurrence of the instantaneous ground fault and selecting a ground fault line;
calling fault recording data, and searching the number of times of transient faults occurring on a fault line and the duration time of each fault within set time; if the fault line has a permanent earth fault within the set time, the search time range is changed into the time from the last permanent fault to the current time;
calculating the insulation coefficient of the fault line according to the fault recording data;
and if the insulation coefficient is larger than 1, reporting insulation early warning information.
3. The line insulation monitoring method based on distributed fault recording as claimed in claim 2, wherein the calculating of the insulation coefficient of the fault line according to the fault recording data includes:
calculating the insulation factor lambda of the fault line by using the following formulai：
Figure FDA0002999071480000012
Wherein: lambda [ alpha ]iThe insulation coefficient of a fault line i with an instantaneous ground fault; rho is a weight coefficient of the fault frequency insulation early warning coefficient; n isiThe number of instantaneous earth faults of the line in a certain time T; n is the expected insulation early warning transient fault frequency; dikFor the duration of each fault; d is a time threshold for judging permanent faults; and T is the search time range.
4. A line insulation monitoring system based on distributed fault recording is characterized by comprising:
the ground fault line selection module is used for recording the occurrence of the instantaneous ground fault and selecting a ground fault line;
the fault recording data calling module is used for calling fault recording data and searching the number of times of transient faults occurring on a fault line and the duration time of each fault within set time; if the fault line has a permanent earth fault within the set time, the search time range is changed into the time from the last permanent fault to the current time;
the insulation coefficient calculation module is used for calculating the insulation coefficient of the fault line according to the fault recording data;
and the insulation early warning module is used for reporting insulation early warning information if the insulation coefficient is greater than 1.
5. The distributed fault recording based line insulation monitoring system of claim 4, wherein the insulation factor calculation module is configured to calculate the insulation factor λ of the faulty line using the following equationi：
Figure FDA0002999071480000021
Wherein: lambda [ alpha ]iThe insulation coefficient of a fault line i with an instantaneous ground fault; rho is a weight coefficient of the fault frequency insulation early warning coefficient; n isiThe number of instantaneous earth faults of the line in a certain time T; n is the expected insulation early warning transient fault frequency; dikFor the duration of each fault; d is a time threshold for judging permanent faults; and T is the search time range.
6. A line insulation monitoring device based on distributed fault recording is characterized by comprising a monitoring controller for realizing the method of claim 2, wherein the input end of the monitoring controller is connected with fault recording data used for generating transient grounding faults for a power distribution network system.
7. The line insulation monitoring device based on distributed fault recording of claim 6, wherein the monitoring controller comprises a data storage analysis module, an analog input conditioning module, a remote signaling input output module, a time synchronization module and a communication module; the data storage and analysis module is connected with the analog input conditioning module, the time synchronization module and the communication module and is used for processing, analyzing and storing data; the analog quantity input conditioning module is used for inputting voltage and current analog quantities; the remote signaling input and output module is used for inputting or outputting switch node information; the time synchronization module is used for receiving GPS or Beidou time synchronization signals; the communication module is used for carrying out communication interaction with other equipment.
CN202110344277.6A 2021-03-30 2021-03-30 Line insulation monitoring method, system and device based on distributed fault recording Pending CN113075511A (en)

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Application Number Priority Date Filing Date Title
CN202110344277.6A CN113075511A (en) 2021-03-30 2021-03-30 Line insulation monitoring method, system and device based on distributed fault recording

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CN113075511A true CN113075511A (en) 2021-07-06

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