CN113030634B - Ground fault positioning method based on network unit host - Google Patents
Ground fault positioning method based on network unit host Download PDFInfo
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
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- 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
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The embodiment of the application provides a ground fault positioning method based on a network unit host, which comprises the steps of obtaining zero sequence voltage, zero sequence current amplitude and phase difference on a terminal; selecting phase difference values of a plurality of calculation periods to perform arithmetic average, and uploading the obtained arithmetic average value of the phase difference values to a network unit host; and the network unit host judges whether a single-phase grounding fault occurs or not according to whether the difference between the phase angle difference data and the phase angle difference data uploaded by other hosts exceeds a fixed value on the arithmetic average value of the phase angle difference values uploaded by the received terminals. For the whole power distribution network, as a subsystem for distributed operation, the power distribution network automation in the whole power distribution network can be independently operated and managed, so that faults occurring in the whole power distribution network can be rapidly processed, and the whole power distribution network is not relied on. For the inside of the system, the network communication time delay is much smaller, and by means of the intelligent comprehensive protection system, the collection and unified processing of the terminal acquisition data can be realized, and further, the accurate judgment of single-phase grounding faults is realized.
Description
Technical Field
The application belongs to the field of power maintenance, and particularly relates to a ground fault positioning method based on a network unit host.
Background
Currently, the power distribution network in the urban area of China is in the form of underground cables or overhead insulated wires, and the probability of short circuit and single-phase ground faults of the lines is relatively low. In rural areas and mountain areas, due to economic considerations, an overhead bare conductor mode is still mainly used for laying the lines, single-phase grounding accidents are more usually caused by various natural or artificial reasons and the like, particularly in mountain areas, single-phase grounding conditions of the lines are easy to occur in succession under the conditions of winter snow or summer thunderstorm weather, partial single-phase grounding can be further deteriorated to short circuit faults, severe weather conditions are often not suitable for line inspection and maintenance when faults occur, and the whole line can be powered off first to wait for good weather to start maintenance.
For single-phase earth faults, the power distribution network lines in China adopt a small-current earth operation mode, and the operation condition of the power distribution network system is complex and changeable, so that the fault electrical characteristic quantity is not obvious when the single-phase earth faults occur in the system, the fault lines and the position are difficult to judge, and the single-phase earth faults of the power distribution network of the small-current earth system become one of the difficulties which afflict the operation of the power distribution network in China for many years. If a reliable single-phase earth fault judging method can be found and applied to the line switch, the switch of the line close to the fault section can make an accurate response when the single-phase earth fault happens to the system, and the power supply reliability of the power distribution network can be greatly improved.
Terminals such as intelligent switches installed on lines can only collect and process the electric information quantity of the installation positions, and the terminals can only rely on the information collected by the terminals when fault judgment is carried out. If the information acquired by other terminals at different positions can be obtained, the judgment can be more accurate by a comparison mode, the data of a plurality of terminals are concentrated at one place, and a network unit host, namely a small network terminal form of the terminal of the power distribution station, can be adopted. The traditional centralized feeder automation uses a plurality of power stations as an automation whole to integrally and coordinately operate, the number of terminals required to be managed by a main station is large, the network and terminal information involved in faults to be processed are complex, the processing rule is complex and easy to make mistakes, and the difficulty of adjusting the rule and parameters after the topology of the system structure changes is large. And the system highly depends on an intact communication system, so that the control requirement cannot be met if the communication delay is too high, and the whole system is paralyzed due to the occurrence of problems of communication key nodes.
Disclosure of Invention
The embodiment of the application provides a ground fault positioning method based on a network unit host, which can greatly shorten the power failure time of a user, reduce the loss caused by power failure and make up the defects of a low-current ground operation mode.
Specifically, the ground fault positioning method based on the network element host provided in the embodiment of the present application includes:
acquiring zero sequence voltage and zero sequence current on an outgoing line where a terminal is located;
acquiring the zero sequence voltage and zero sequence current amplitude and phase difference on a terminal;
selecting phase difference values of a plurality of calculation periods to perform arithmetic average, and uploading the obtained arithmetic average value of the phase difference values to a network unit host;
and the network unit host judges whether a single-phase grounding fault occurs or not according to whether the difference between the phase angle difference data and the phase angle difference data uploaded by other terminals exceeds a fixed value or not according to the arithmetic average value of the phase angle difference values uploaded by the received terminals.
Optionally, the acquiring the zero sequence voltage, the zero sequence current amplitude and the phase difference on the terminal includes:
if the zero sequence voltage of the system is monitored to rise above U 0set Judging whether the amplitude of the check zero sequence current exceeds the design value I 0set ；
When the zero sequence current amplitude exceeds the design value I 0set And then calculating the amplitude and phase difference of the stabilized zero sequence voltage and zero sequence current.
Optionally, the network unit host determines whether a single-phase ground fault occurs based on whether the difference between the phase angle difference data and the phase angle difference data uploaded by other terminals exceeds a fixed value, for an arithmetic average value of the phase angle difference values uploaded by the received terminals, including:
for the phase difference value data uploaded by the terminals of all bus outgoing lines, the network unit host firstly selects the terminal data installed at the head end of the outgoing line according to the installation position of the terminal for comparison, and if the phase difference value data uploaded by one terminal host is different from the phase difference value data uploaded by other terminals by more than a fixed value delta theta set And judging that the outgoing line has single-phase grounding fault.
Optionally, the network unit host determines whether a single-phase ground fault occurs based on whether the difference between the phase angle difference data and the phase angle difference data uploaded by other terminals exceeds a fixed value, for an arithmetic average value of the phase angle difference values uploaded by the received terminals, and further includes:
comparing the data uploaded by all terminals on the fault outgoing line, if the difference of the uploaded phase angle difference data of two adjacent terminals exceeds delta theta set Determining that a single-phase ground fault occurs between the two terminals, and determining that the fault occursIs a line section of the above system.
Optionally, the method further comprises:
calculating the starting phase angle difference of the terminal except that the zero sequence voltage meeting the starting condition reaches the set value U 0set The zero sequence current also reaches the set value I 0set . Wherein U is 0set ＝500～2000，I 0set ＝2～5。
Optionally, the method further comprises:
the arithmetic average value of the zero sequence voltage zero sequence current phase angle difference values in a plurality of power frequency periods after the fault occurs is used for diagnosis. The calculation of the arithmetic mean value is to calculate the phase angle difference value of a single period, and then calculate the arithmetic mean value of the calculated difference values of a plurality of periods, so that the calculation sequence can not be reversed.
Optionally, the method further comprises:
and judging the interval positions of the fault outgoing line and the fault on the outgoing line respectively, wherein the adopted data sets are different, the former is the data of all the received outgoing line head terminals, and the latter is the data of all the terminals on one outgoing line. The flow execution sequence is to judge the outgoing line first and then judge the interval.
Optionally, the method further comprises:
the fixed value delta theta set The value is 10-20 degrees.
The beneficial effects are that:
the advantages of judging the network unit host and collecting the network unit host and the intelligent terminal are combined, the advantages that the zero sequence current direction of a fault line in a neutral point ungrounded system is opposite to that of a non-fault line are utilized, the zero sequence current direction of the fault line in the neutral point ungrounded system is influenced by the resistive component of the arc-extinguishing line, the zero sequence current direction of the neutral point is separated from the non-fault line by a certain included angle, single-phase grounding fault judgment is carried out, the accuracy is high, and the section where the fault is can be judged rapidly at the same time.
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In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a network element host-based ground fault positioning method according to an embodiment of the present application.
Detailed Description
To further clarify the structure and advantages of the present application, a further description of the structure will be provided with reference to the drawings.
In order to overcome the defects, the power distribution network is divided into a plurality of small network units according to the topological characteristics of the power distribution network system, such as two power transformation stations, one hand-held loop closing line, the middle of the power transformation stations are connected by a plurality of switching stations in a loop, and the power distribution network is disconnected at a connecting switch in an open loop running state in normal running. In the small system, a set of intelligent terminals matched with each switch, a communication manager matched with each switching station, a distributed distribution network intelligent comprehensive protection system formed by a network unit host arranged in one switching station and a matched optical fiber and wireless communication system are established, and the distributed distribution network intelligent comprehensive protection system is used for managing and operating fault automation in the small system. The scheme is a small distributed operation subsystem for the whole power distribution network, is used for independently operating and managing the power distribution network automation in the whole power distribution network, can rapidly process faults occurring in the whole power distribution network, and has the advantage of low communication dependence of distributed feeder automation. For the inside of the small system, the system is a centralized automatic system, the network communication time delay is much smaller, and the system has the advantages of quick fault processing and less switching times. By means of the intelligent comprehensive protection system, the collection and unified processing of the terminal collected data can be achieved, and further accurate judgment of single-phase grounding faults is achieved.
Specifically, the method for positioning a ground fault based on a network element host according to the embodiment of the present application, as shown in fig. 1, includes:
acquiring zero sequence voltage and zero sequence current on an outgoing line where a terminal is located;
acquiring the zero sequence voltage and zero sequence current amplitude and phase difference on a terminal;
selecting phase difference values of a plurality of calculation periods to perform arithmetic average, and uploading the obtained arithmetic average value of the phase difference values to a network unit host;
and the network unit host judges whether a single-phase grounding fault occurs or not according to whether the difference between the phase angle difference data and the phase angle difference data uploaded by other terminals exceeds a fixed value or not according to the arithmetic average value of the phase angle difference values uploaded by the received terminals.
In implementation, the data processing of the terminal specifically implements the software flow as follows:
1. the single-phase earth fault line selection diagnosis equipment monitors zero sequence voltage and zero sequence current at the installed position in real time, and when the zero sequence voltage value is detected to be larger than U 0set And the zero sequence current value is greater than I 0set And starting a data analysis flow.
2. And calculating the phase angle difference value of the zero sequence voltage and the zero sequence current in a single power frequency period in the steady state after the fault.
3. And calculating the average value of the phase angle difference values of the zero sequence voltage and current in a plurality of power frequency periods after the fault.
4. Uploading the difference average value to a network element host.
The data processing implementation software flow of the network center host is as follows:
1) And obtaining the phase angle difference value data uploaded by all the terminals.
2) And analyzing all the terminal data at the outlet head end, and if the difference value between the data uploaded by one terminal and the data uploaded by other terminals exceeds a set value. And indicating that the outgoing line where the terminal is located has single-phase grounding fault.
3) If a fault line is found in the last step, analyzing and processing the data uploaded by all terminals on the line, if the difference of the data uploaded by two adjacent terminals exceeds a set value, indicating that the fault occurs between the two terminals, otherwise, indicating that the fault occurs at one of the last terminals, namely the line end.
Optionally, the acquiring the zero sequence voltage, the zero sequence current amplitude and the phase difference on the terminal includes:
if the zero sequence voltage of the system is monitored to rise above U 0set Judging whether the amplitude of the check zero sequence current exceeds the design value I 0set ；
When the zero sequence current amplitude exceeds the design value I 0set And then calculating the amplitude and phase difference of the stabilized zero sequence voltage and zero sequence current.
The invention adopts the mode of combining the network unit host of the power distribution station with the terminal, the terminal collects the zero sequence voltage and the zero sequence current on the outgoing line of the power distribution station, when the rise of the zero sequence voltage of the system exceeding U is monitored 0set Checking whether the zero sequence current amplitude exceeds the design value I 0set If so, starting to calculate the stabilized zero sequence voltage, the zero sequence current amplitude and the phase difference, and taking the phase difference values of a plurality of calculation periods to perform arithmetic average. And uploading the obtained phase difference value to a network unit host, and performing comparative analysis processing on the received data uploaded by the plurality of terminals by the network unit host. The method comprises the following two steps:
1) For the phase difference value data uploaded by all bus outgoing terminals, the network unit host firstly selects the terminal data installed at the outgoing head end according to the installation position of the terminal to compare, and if the phase difference value data uploaded by one terminal host is different from the phase difference value uploaded by other terminals
The data difference exceeds a fixed value delta theta set And judging that the outgoing line has single-phase grounding fault. 2) Comparing the data uploaded by all terminals on the fault outgoing line, if the difference of the uploaded phase angle difference data of two adjacent terminals exceeds delta theta set And judging that a single-phase ground fault occurs between the two terminals, so as to determine a faulty line section.
Optionally, the network unit host determines whether a single-phase ground fault occurs based on whether the difference between the phase angle difference data and the phase angle difference data uploaded by other terminals exceeds a fixed value, for an arithmetic average value of the phase angle difference values uploaded by the received terminals, including:
for the phase difference value data uploaded by the terminals of all bus outgoing lines, the network unit host selects to install according to the installation position of the terminalsComparing the terminal data installed at the outlet head end, if the difference between the phase angle difference data uploaded by one terminal host and the phase angle difference data uploaded by other terminals exceeds a fixed value delta theta set Judging that the outgoing line has single-phase grounding fault; or comparing the data uploaded by all terminals on the fault outgoing line, if the difference of the uploaded phase angle difference data of two adjacent terminals exceeds delta theta set And judging that a single-phase ground fault occurs between the two terminals, and determining a faulty line section.
In practice, the equipment installed in the line or substation collects the zero sequence current and the zero sequence voltage at its installation location and continuously calculates its effective value U 0RMS And I 0RMS . When U is monitored 0RMS And I 0RMS Exceeding the set value U 0set And I 0Set When (1).
Namely U 0RMS >U 0set And I 0RMS >I 0set In the time-course of which the first and second contact surfaces,
DFT (fast Fourier transform calculation) is carried out on the zero sequence current and the zero sequence voltage after the fault, and the zero sequence voltage and the zero sequence current phase angle of one power frequency period are calculated as shown in the following formula.
θ U0i ＝DFT(U 0 (i))，θ I0i ＝DFT(I 0 (i))。
Solving the difference delta theta between the zero sequence current and the zero sequence voltage in one power frequency period i ，Δθ i ＝θ U0i -θ I0i 。
And calculating an arithmetic average delta theta of the zero sequence voltage and zero sequence current difference values obtained through calculation in a plurality of power frequency periods.
And the terminal uploads the calculated phase angle difference arithmetic average value to a network unit host.
All zero sequence phase angle differences sent by the network unit host computer to the managed terminal are recorded as delta theta Ti Recording the phase angle difference value sent back by the head station terminal of each outgoing line as delta theta T1i I=1 to m, if i=j satisfies
|Δθ T1j -Δθ T1i |>Δθ set I=1 to m, and i+.j, the j-th line is the line with single-phase earth fault.
If the fault outgoing line is judged in the previous step, the next fault interval judgment is carried out, and the network unit host machine records all terminals on the fault outgoing line j judged in the previous step as delta theta in sequence Tji I=1 to p, if i=k satisfies |Δθ Tjk -Δθ Tj(k+1) |>Δθ set Then, it is indicated that a fault occurs between the k-th and k+1-th terminals, and if no i=k satisfies the above condition, it is indicated that a fault occurs at the line end.
Optionally, the method further comprises:
calculating the starting phase angle difference of the terminal except that the zero sequence voltage meeting the starting condition reaches the set value U 0set The zero sequence current also reaches the set value I 0set . Wherein U is 0set ＝500～2000，I 0set ＝2～5。
Optionally, the method further comprises:
the arithmetic average value of the zero sequence voltage zero sequence current phase angle difference values in a plurality of power frequency periods after the fault occurs is used for diagnosis. The calculation of the arithmetic mean value is to calculate the phase angle difference value of a single period, and then calculate the arithmetic mean value of the calculated difference values of a plurality of periods, so that the calculation sequence can not be reversed.
Optionally, the method further comprises:
and judging the interval positions of the fault outgoing line and the fault on the outgoing line respectively, wherein the adopted data sets are different, the former is the data of all the received outgoing line head terminals, and the latter is the data of all the terminals on one outgoing line. The flow execution sequence is to judge the outgoing line first and then judge the interval.
Optionally, the method further comprises:
the fixed value delta theta set The value is 10-20 degrees.
The technology can rapidly realize fault location, not only can greatly perfect the automation degree of the power distribution network, but also can greatly shorten the power failure time of users, reduce the loss caused by power failure, make up the defects of a small-current grounding operation mode, and have good social and economic benefits.
The invention utilizes the characteristic that the included angles between the zero sequence voltage and the zero sequence current of the outgoing line of the single-phase grounding fault of the continuous low-current grounding system are different, and uploads the zero sequence voltage current phase angle differences acquired by the intelligent terminals installed at different positions to a network unit host for analysis and processing, thereby determining the fault outgoing line and the fault interval.
The foregoing description of the embodiments is provided for the purpose of illustration only and is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, alternatives, and alternatives falling within the spirit and scope of the invention.
Claims (7)
1. The ground fault positioning method based on the network unit host is characterized by comprising the following steps:
acquiring zero sequence voltage and zero sequence current on an outgoing line where a terminal is located;
acquiring the amplitude value of zero sequence voltage and zero sequence current on a terminal and the phase difference between the zero sequence voltage and the zero sequence current;
selecting phase difference values of a plurality of calculation periods to perform arithmetic average, and uploading the obtained arithmetic average value of the phase difference values to a network unit host;
the network unit host judges whether a single-phase grounding fault occurs or not according to whether the difference between the phase angle difference data and the phase angle difference data uploaded by other terminals exceeds a fixed value or not according to the arithmetic average value of the phase angle difference values uploaded by the received terminals;
the network unit host judges whether a single-phase grounding fault occurs or not based on whether the difference between the phase angle difference data and the phase angle difference data uploaded by other terminals exceeds a fixed value on the arithmetic average value of the phase angle difference values uploaded by the received terminals, and comprises the following steps:
for the phase difference value data uploaded by all bus outgoing terminals, the network unit host firstly selects all the terminal data installed at the outgoing head end for comparison according to the installation position of the terminal, and if a certain terminal host is uploadedThe phase angle difference data uploaded by other terminals is different by more than a fixed value delta theta set And judging that the outgoing line where the terminal is positioned has single-phase grounding fault.
2. The method for positioning a ground fault based on a network unit host according to claim 1, wherein the obtaining the zero sequence voltage and the zero sequence current amplitude and the phase difference on the terminal comprises:
if the zero sequence voltage of the system is monitored to rise above U 0set Judging whether the amplitude of the check zero sequence current exceeds the design value I 0se ；
When the zero sequence current amplitude exceeds the design value I 0set And then calculating the amplitude and phase difference of the stabilized zero sequence voltage and zero sequence current.
3. The network element host-based ground fault localization method according to claim 1 or 2, wherein the network element host determines whether a single-phase ground fault occurs based on whether a difference between phase angle difference data and phase angle difference data uploaded by other terminals exceeds a fixed value for an arithmetic average of phase angle difference values uploaded by a plurality of received terminals, and further comprising:
comparing the data uploaded by all terminals on the fault outgoing line, if the difference of the uploaded phase angle difference data of two adjacent terminals exceeds delta theta set And judging that a single-phase ground fault occurs between the two terminals, and determining a faulty line section.
4. The network element host-based ground fault localization method of claim 1, further comprising:
calculating the starting phase angle difference of the terminal except that the zero sequence voltage meeting the starting condition reaches the set value U 0set The zero sequence current also reaches the set value I 0set The method comprises the steps of carrying out a first treatment on the surface of the Wherein U is 0set ＝500～2000，I 0set ＝2～5。
5. The network element host-based ground fault localization method of claim 1, further comprising:
the arithmetic average value of the zero sequence voltage zero sequence current phase angle difference values in a plurality of power frequency periods after the fault occurs is used for diagnosis;
the calculation of the arithmetic mean value is to calculate the phase angle difference value of a single period, and then calculate the arithmetic mean value of the calculated difference values of a plurality of periods, so that the calculation sequence can not be reversed.
6. The network element host-based ground fault localization method of claim 1, further comprising:
and judging the fault outgoing line and the section position of the fault on the outgoing line respectively.
7. The network element host-based ground fault localization method of claim 1, further comprising:
the fixed value delta theta set The value is 10-20 degrees.
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| CN113567811B (en) * | 2021-08-13 | 2023-02-17 | 广东电网有限责任公司 | Distribution line single-phase fault detection method and related device |
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