JP7099105B2 - Short circuit location system, short circuit method and program - Google Patents

Description

Embodiments of the present invention relate to a short circuit point locating system, a short circuit point locating method and a program.

A method for identifying an accident point such as a short circuit point of a distribution line will be described.
A switch with a timed input function is installed in each section of the distribution line. When a protective relay installed in a distribution line substation detects an accident, switches are sequentially turned on according to the opening and closing of the distribution line circuit breaker, and the accident section is specified. The accident point (faulty equipment) of the distribution line is discovered by patrol or accident exploration after the accident section is identified.

The location of the accident point of the transmission line will be explained.
As a short circuit accident locator, an FL (Fault Locator) device is installed on the transmission line. The FL device measures the voltage at the time of the accident and the passing current, and calculates the distance to the accident point by calculating using the impedance information peculiar to the transmission line. The FL device is expensive because it requires a sensor and a calculation unit, and is not used for distribution lines.
Regarding the technique for identifying the fault point of the distribution line, a technique for specifying the short-circuit position when a short-circuit accident occurs is known (see, for example, Patent Document 1). According to this technique, the short-circuit position is defined from the relationship between the line distance and the impedance Zo by using the potential difference of the voltage to ground at the two measurement points located on the power supply side of the short-circuit point.

Japanese Unexamined Patent Publication No. 2005-300207

When the protective relay detects an accident, when the accident section is specified by sequentially turning on the switches according to the opening and reclosing of the distribution line circuit breaker, the aspect of the accident is continuing. Is a prerequisite. If the appearance of the accident does not continue after the reclosing, the protective relay will not restart and the accident section cannot be specified. Even in such a case, it is necessary to discover the accident point in order to confirm the soundness of the distribution equipment, judge the possibility of future accidents, and identify the cause of the accident. However, since the accident section has not been identified, the accident point must be found by patrol for all sections of the distribution line where the accident occurred, and it takes a lot of time to find the accident point.

Assuming that the FL device is installed on the distribution line, an excessive capital investment is required to install the FL device, and there is a problem in profitability.
The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a short-circuit point locating system, a short-circuit point locating method and a program capable of shortening the time required for finding a short-circuit point of a distribution line. ..

One aspect of the present invention is an acquisition unit that acquires a voltage measurement result and a current measurement result when a short circuit occurs from the distribution line system information management system, and a measurement of the current acquired by the acquisition unit. A short circuit obtained from the current value determination unit that determines whether or not an overflow has occurred in the short circuit current waveform, which is the current waveform when a short circuit is generated, and the short circuit obtained from the measurement result of the voltage acquired by the acquisition unit. The short-circuit current waveform obtained from the measurement result of the current acquired by the acquisition unit and the voltage waveform determination unit for determining whether or not the short-circuit voltage waveform, which is the voltage waveform when the above occurs, is disturbed. At least one determination of a current waveform determination unit for determining whether or not is generated, a determination result by the current value determination unit, a determination result by the voltage waveform determination unit, and a determination result by the current waveform determination unit. Depending on the result, the analysis unit analyzes one or both of the short-circuit current waveform and the short-circuit voltage waveform, and the analysis unit analyzes either one or both of the short-circuit current waveform and the short-circuit voltage waveform. This is a short-circuit point determination system including a short-circuit point derivation unit for deriving a short-circuit point based on the effective value of the short-circuit current obtained by analyzing the above.
In the short-circuit point determination system of one aspect of the present invention, the analysis unit determines that the short-circuit current waveform has an overflow, and the voltage waveform determination unit is disturbed by the short-circuit voltage waveform. When the current waveform determination unit determines that the short-circuit current waveform is disturbed, the voltage value before the short-circuit occurs, the current value, and the measurement point are reached. Based on the impedance information of, the voltage value transmitted by the substation is derived, and the effective value of the short-circuit current is based on the voltage value transmitted by the derived substation and the voltage value when a short circuit occurs. Is derived.
In the short-circuit point determination system of one aspect of the present invention, the analysis unit determines that the current value determination unit has an overflow in the short-circuit current waveform, and the voltage waveform determination unit is disturbed by the short-circuit voltage waveform. When the current waveform determination unit determines that the short-circuit current waveform is not disturbed, the relationship between the instantaneous value of the current derived from the short-circuit current waveform and the phase Based on this, the peak value is derived, and the effective value of the short-circuit current is derived from the derived peak value.
In the short-circuit point determination system of one aspect of the present invention, the short-circuit type determination unit for determining the type of the short-circuit based on the short-circuit voltage waveform acquired by the acquisition unit and the short-circuit current waveform is provided, and the short-circuit point is determined. The derivation unit derives a short circuit point based on the type of the short circuit determined by the short circuit type determination unit.
One aspect of the present invention is a step of acquiring a voltage measurement result and a current measurement result from a distribution line system information management system when a short circuit occurs, and a step of acquiring the current acquired in the acquisition step. A short circuit obtained from the measurement result of the voltage acquired in the step of determining whether or not an overflow has occurred in the short circuit current waveform, which is the current waveform when a short circuit obtained from the result occurs, occurs. The short-circuit current waveform obtained from the measurement result of the current acquired in the step of determining whether or not the short-circuit voltage waveform, which is the voltage waveform at that time, is disturbed occurs. The step of determining whether or not the short-circuit current waveform is overflowed, the determination result of whether or not the short-circuit voltage waveform is disturbed, and the short-circuit current waveform. In the step of analyzing one or both of the short-circuit current waveform and the short-circuit voltage waveform, and the step of analyzing the short-circuit voltage waveform according to at least one determination result of whether or not the turbulence has occurred. A short circuit performed by a computer, comprising a step of deriving a short circuit point based on an effective value of the short circuit current obtained by analyzing one or both of the short circuit current waveform and the short circuit voltage waveform. It is a point setting method.
One aspect of the present invention is a step of acquiring a voltage measurement result and a current measurement result from a distribution line system information management system to a computer when a short circuit occurs, and the step acquired in the acquisition step. Obtained from the step of determining whether or not an overflow has occurred in the short-circuit current waveform, which is the current waveform when a short circuit occurs, obtained from the current measurement result, and the voltage measurement result acquired in the acquisition step. The step of determining whether or not the short-circuit voltage waveform, which is the voltage waveform when a short circuit occurs, is disturbed, and the short-circuit current waveform obtained from the measurement result of the current acquired in the acquisition step is disturbed. The step of determining whether or not the short circuit has occurred, the determination result of whether or not the short circuit current waveform has overflow, the determination result of whether or not the short circuit voltage waveform has been disturbed, and the short circuit. The step of analyzing one or both of the short-circuit current waveform and the short-circuit voltage waveform according to at least one determination result of the determination result of whether or not the current waveform is disturbed, and the analysis. There is a program that executes a step of deriving a short-circuit point based on an effective value of the short-circuit current obtained by analyzing one or both of the short-circuit current waveform and the short-circuit voltage waveform.

According to an embodiment of the present invention, it is possible to provide a short-circuit point locating system, a short-circuit point locating method, and a program capable of shortening the time required for finding a short-circuit point of a distribution line.

It is a schematic diagram which shows an example of the distribution line system to which the short circuit point identification system of an embodiment is applied. It is a block diagram which shows the short-circuit point locating system which comprises the distribution line system of an embodiment. It is a figure which shows an example (the 1) of the operation of the short circuit point setting system of an embodiment. It is a figure which shows an example (the 2) of the operation of the short circuit point setting system of an embodiment. It is a figure which shows an example (the 3) of the operation of the short circuit point setting system of an embodiment. It is a figure which shows an example (the 4) of the operation of the short circuit point setting system of an embodiment. It is a figure which shows an example (the 5) of the operation of the short circuit point setting system of an embodiment. An example of the short circuit current waveform in the case of a single-phase short circuit is shown. It is a figure which shows an example (the 6) of the operation of the short circuit point setting system of an embodiment. It is a figure which shows an example (the 7) of the operation of the short circuit point setting system of an embodiment. It is a flowchart which shows an example (the 1) of the operation of the short circuit point setting system of an embodiment. It is a flowchart which shows an example (the 2) of the operation of the short circuit point setting system of an embodiment.

Next, the short-circuit point locating system, the short-circuit point locating method, and the program of the present embodiment will be described with reference to the drawings. The embodiments described below are merely examples, and the embodiments to which the present invention is applied are not limited to the following embodiments.
In all the drawings for explaining the embodiment, the same reference numerals are used for those having the same function, and the repeated description will be omitted.
Further, "based on XX" as used in the present application means "based on at least XX", and includes a case where it is based on another element in addition to XX. Further, "based on XX" is not limited to the case where XX is directly used, but also includes the case where it is based on a case where calculation or processing is performed on XX. "XX" is an arbitrary element (for example, arbitrary information).

(Embodiment)
(Short circuit point determination system)
FIG. 1 is a schematic diagram showing an example of a distribution line system to which the short-circuit point positioning system of the embodiment is applied.
The short circuit point determination system of the embodiment is applied to a distribution line system. The distribution line system supplies electric power from the power plant to consumer loads such as residential, commercial facilities, and industrial facilities via the substation 300.
The distribution line power system includes a short-circuit point setting system 100, a distribution line system information management system 200, a substation 300, a distribution line DL, and automatic switches 400-1 to 400-n (n is). n> 0) and the remote control device 500-1 to the remote control device 500-n. FIG. 1 shows the case of n = 3.
The distribution system is divided into a plurality of distribution sections, and the automatic switch 400-1 to the automatic switch 400-n are located between the distribution section and the adjacent distribution section (the rising portion of the distribution line DL). Each of the is attached.
For each of the automatic switch 400-1 to the automatic switch 400-n, the remote control device 500-1 to the remote control device 500-that control each of the automatic switch 400-1 to the automatic switch 400-n from a distance. n are connected respectively.
Hereinafter, any automatic switch among the automatic switch 400-1 to the automatic switch 400-n will be referred to as an automatic switch 400. Further, any of the distant control devices 500-1 to the distant control device 500-n is referred to as a distant control device 500.

The automatic switch 400 can switch between conduction (on) and insulation (open) between its terminals. The automatic switch 400 automatically switches from open to turned on under predetermined conditions when responding to recovery from an accident in the distribution line DL. An example of an accident is a short circuit. Further, in the event of an accident such as a ground fault in the distribution line DL, the circuit breaker of the substation 300 is opened by the relay, and the automatic switch 400 is also opened. Further, the automatic switch 400 operates a timer when power is supplied from a predetermined direction by re-turning on the circuit breaker of the substation 300, and switches to turning on when the timer detects the passage of a predetermined time. ..
The automatic switch 400 has a built-in sensor that measures voltage and current. The automatic switch 400 is a remote control device connected to the automatic switch 400 for the measurement result including the voltage measurement result and the voltage measurement time, and the current measurement result and the current measurement time. Notify 500 periodically.

Each of the remote control device 500-1 to the remote control device 500-n acquires the measurement results periodically notified by each of the automatic switch 400-1 to the automatic switch 400-n, and obtains the acquired measurement results. It is superimposed on the distribution line DL. The measurement results superimposed on the distribution line DL by each of the remote control device 500-1 to the remote control device 500-n are transmitted to the distribution line system information management system 200 via a transmission line such as an optical fiber OF. In the example shown in FIG. 1, the information is transmitted to the distribution line system information management system 200 via the optical fiber OF connected to the automatic switch 400-1.
The distribution line system information management system 200 acquires the measurement results notified by each of the remote control devices 500-1 to the remote control devices 500-n, and stores the acquired measurement results.
A protective relay (not shown) is installed in the substation 300 to detect the occurrence of an accident. When a current equal to or greater than the set current value passes through each of the distant control device 500-1 to the distant control device 500-n, an accident has occurred in each of the distant control device 500-1 to the distant control device 500-n. Information indicating the above (hereinafter referred to as "accident occurrence information") is notified to the distribution line system information management system 200. Here, the accident occurrence information includes information indicating the type of accident (“short circuit” in the present embodiment) and information indicating the accident occurrence time (hereinafter referred to as “accident occurrence time information”). Specifically, as shown in FIG. 1, when the distribution line DL is short-circuited at the short-circuit point SP between the automatic switch 400-2 and the automatic switch 400-3, the remote control device 500-2 Notifies the accident occurrence information to the distribution line system information management system 200.
The distribution line system information management system 200 acquires the accident occurrence information notified by the remote control device 500-2, and among the measurement results stored based on the accident occurrence time information included in the acquired accident occurrence information. The measurement results before a predetermined time from the time when the accident occurred and after the time when the accident occurred are transmitted to the short-circuit point setting system 100.

The short-circuit point determination system 100 is connected to the distribution line system information management system 200 via a network 50 such as the Internet. The short-circuit point setting system 100 receives the measurement result (measurement result before a predetermined time from the time when the accident occurred and after the time when the accident occurs) transmitted by the distribution line system information management system 200, and the received measurement result. Information indicating the measurement result of the voltage and the time when the voltage was measured (hereinafter referred to as "short-circuit voltage information") and information indicating the measurement result of the current and the time when the current was measured (hereinafter referred to as "short-circuit current information"). Of these, the effective value of the short-circuit current is derived based on the short-circuit current information or the short-circuit voltage information and the short-circuit current information. The short-circuit point determination system 100 defines a short-circuit point by finding a point where the effective value of the derived short-circuit current and the short-circuit current derived from the impedance of the distribution line DL match.

Hereinafter, among the short-circuit point locating system 100 included in the distribution line power system, the distribution line system information management system 200, the substation 300, the automatic switch 400, and the remote control device 500, the short-circuit point locating system 100 will be described. explain.
(Short circuit point determination system 100)
FIG. 2 is a block diagram showing a short-circuit point setting system 100 constituting the distribution line system of the embodiment.
The short circuit point determination system 100 is realized by a device such as a personal computer, a server, or an industrial computer.
The short-circuit point determination system 100 includes a communication unit 110, a storage unit 120, an information processing unit 130, and an address bus, a data bus, or the like for electrically connecting each component as shown in FIG. It is equipped with a bus line 150.

The communication unit 110 is realized by a communication module. The communication unit 110 communicates with an external communication device such as the distribution line system information management system 200 via the network 50. Specifically, the communication unit 110 receives and receives the measurement result (measurement result before a predetermined time from the time when the accident occurred and after the time when the accident occurred) transmitted by the distribution line system information management system 200. The measured measurement result is output to the information processing unit 130. Further, the communication unit 110 transmits the result of defining the short-circuit point output by the information processing unit 130 to a predetermined communication device such as the distribution line system information management system 200.

The storage unit 120 is realized by, for example, a RAM (Random Access Memory), a ROM (Read Only Memory), an HDD (Hard Disk Drive), a flash memory, or a hybrid storage device in which a plurality of these are combined. Instead of providing a part or all of the storage unit 120 as a part of the short-circuit point setting system 100, a processor of the short-circuit point setting system 100 such as NAS (Network Attached Storage) or an external storage server connects the network 50. It may be realized by an external device accessible via. The storage unit 120 stores the program 121 executed by the information processing unit 130, the application 122, the distribution line impedance 123, the short-circuit voltage information 124, and the short-circuit current information 125.

The application 122 causes the short-circuit point determination system 100 to receive the measurement result transmitted by the distribution line system information management system 200.
The application 122 stores the short-circuit voltage information included in the received measurement result and the short-circuit current information in the short-circuit point setting system 100 in association with the measurement time.
In the application 122, an overflow (OVF) occurs in the current waveform (hereinafter referred to as “short circuit current waveform”) obtained from the short circuit current information among the short circuit voltage information and the short circuit current information stored in the short circuit point setting system 100. Have them judge whether or not they are doing it. Here, the overflow means a portion where the short-circuit current does not exceed a certain value because the short-circuit current is drawn horizontally near the upper limit value even after a lapse of time.
In the application 122, is the short-circuit voltage information stored in the short-circuit point setting system 100 and the short-circuit current information, the voltage waveform obtained from the short-circuit voltage information (hereinafter referred to as “short-circuit voltage waveform”) disturbed? Have them judge whether or not.
The application 122 causes the short-circuit point determination system 100 to determine whether or not the short-circuit current waveform obtained from the short-circuit current information among the stored short-circuit voltage information and short-circuit current information is disturbed.

The app 122 determines whether or not the short-circuit current waveform has overflow in the short-circuit point determination system 100, the result of determining whether or not the short-circuit voltage waveform is disturbed, and the short-circuit current waveform. The effective value of the short-circuit current is derived by analyzing the short-circuit current waveform or the short-circuit current waveform and the short-circuit voltage waveform according to the result of determining whether or not the turbulence has occurred.
The application 122 causes the short-circuit point determination system 100 to derive a short-circuit point based on the effective value of the derived short-circuit current.
The distribution line impedance 123 is the distribution line impedance from the substation 300 to the position where each of the automatic switch 400-1 to the automatic switch 400-n is installed.
The short-circuit voltage information 124 is short-circuit voltage information included in the measurement result transmitted by the distribution line system information management system 200.
The short-circuit current information 125 is short-circuit current information included in the measurement result transmitted by the distribution line system information management system 200.

The information processing unit 130 is, for example, a functional unit (hereinafter referred to as “software functional unit”) realized by executing a program 121 stored in a storage unit 120 or an application 122 by a processor such as a CPU (Central Processing Unit). Is. All or part of the information processing unit 130 may be realized by hardware such as LSI (Large Scale Integration), ASIC (Application Specific Integrated Circuit), or FPGA (Field-Programmable Gate Array), and is a software function. It may be realized by a combination of a unit and hardware.
The information processing unit 130 is, for example, an acquisition unit 131, a short circuit type determination unit 132, a current value determination unit 134, a voltage waveform determination unit 135, a current waveform determination unit 136, an analysis unit 137, and a short circuit point extraction unit. It is equipped with 138.

The acquisition unit 131 acquires the measurement result output by the communication unit 110.
The acquisition unit 131 outputs the short-circuit voltage information and the short-circuit current information included in the acquired measurement result to the short-circuit type determination unit 132. Further, the acquisition unit 131 outputs the short-circuit current information among the short-circuit voltage information and the short-circuit current information included in the acquired measurement result to the current value determination unit 134 and the current waveform determination unit 136. Further, the acquisition unit 131 outputs the short-circuit voltage information among the short-circuit voltage information included in the acquired measurement result and the short-circuit current information to the voltage waveform determination unit 135. Further, the acquisition unit 131 outputs the short-circuit voltage information and the short-circuit current information included in the acquired measurement result to the analysis unit 137. Further, the acquisition unit 131 stores the short-circuit voltage information included in the acquired measurement result and the short-circuit current information in the storage unit 120 in association with each other.

The short-circuit type determination unit 132 acquires the short-circuit voltage information output by the acquisition unit 131 and the short-circuit current information, and based on the acquired short-circuit voltage information and the short-circuit current information, the type of the short circuit generated is three-phase. Determine whether it is a short circuit, a single-phase short circuit, or an interphase ground fault short circuit.
Specifically, the short-circuit type determination unit 132 has a current increase rate of X% at the phase current ratio before the accident occurs, based on the short-circuit current information of the acquired short-circuit voltage information and the short-circuit current information. It is determined whether or not it is the above. Specifically, the short-circuit type determination unit 132 automatically determines whether or not the current increase rate is X% or more at the phase current ratio before the accident occurs by image processing the short-circuit current information. do.

When the short-circuit type determination unit 132 determines that the current increase rate of all three phases is X% or more, the short-circuit type determination unit 132 determines whether or not the voltage of the three phases has increased after the accident has occurred, based on the short-circuit voltage information. judge. Specifically, the short-circuit type determination unit 132 automatically determines whether or not the three-phase voltage has risen after the accident has occurred by performing image processing on the short-circuit voltage information. When it is determined that all of the three-phase voltages have not risen, the short-circuit type determination unit 132 determines that the three-phase short circuit has occurred. The short-circuit type determination unit 132 determines that a single-phase short circuit occurs when the voltage of one of the three phases rises.
On the other hand, when the short-circuit type determination unit 132 determines that the current increase rate of the two phases of the three phases is X% or more, it determines that the short circuit is a single-phase short circuit. When the short-circuit type determination unit 132 determines that the current increase rate of one of the three phases is X% or more, it determines that the short-circuit is a ground fault short circuit between different phases.
The short-circuit type determination unit 132 outputs information indicating the determination result of the short-circuit type (hereinafter, “short-circuit type information”) to the voltage waveform determination unit 135, the current waveform determination unit 136, and the short-circuit point derivation unit 138.
If the short circuit type information indicates an interphase ground fault short circuit, the process ends.

The current value determination unit 134 acquires the short-circuit current information output by the acquisition unit 131, and determines whether or not an overflow has occurred in the short-circuit current waveform obtained from the acquired short-circuit current information. Specifically, the current value determination unit 134 automatically determines whether or not an overflow has occurred in the waveform of the short-circuit current obtained from the short-circuit current information by performing image processing on the short-circuit current information.
FIG. 3 is a diagram showing an example (No. 1) of the operation of the short-circuit point setting system 100 of the embodiment. In FIG. 3, the horizontal axis is time and the vertical axis is current [A]. Here, the time is represented by the elapsed time from a certain reference time. Here, a certain reference time is a time before a predetermined time when an accident occurs. FIG. 3 shows an example of a process in which the current value determination unit 134 determines the short-circuit current.
As shown in FIG. 3, the current value determination unit 134 is a portion where the short-circuit current does not exceed a certain value because the short-circuit current is drawn horizontally near the upper limit value even if time elapses in the waveform of the short-circuit current. If there is a (part) (hereinafter referred to as "OVF (overflow) location"), it is determined that an overflow has occurred, and if there is no overflow, it is determined that an overflow has not occurred. In the example shown in FIG. 3, the overflow occurs after the time is 0.08.
The current value determination unit 134 outputs a determination result (hereinafter referred to as “overflow determination result”) of whether or not there is an OVF portion in the waveform of the short-circuit current to the analysis unit 137.

The voltage waveform determination unit 135 acquires the short-circuit voltage information output by the acquisition unit 131. Further, the voltage waveform determination unit 135 acquires the short-circuit type information output by the short-circuit type determination unit 132. Further, when the voltage waveform determination unit 135 acquires the information instructing the determination of the short-circuit voltage waveform output by the analysis unit 137, which will be described later (hereinafter referred to as “short-circuit voltage waveform determination instruction information”), the short-circuit type determination unit 132 Based on the acquired short-circuit type information, it is determined whether or not the waveform of the short-circuit voltage obtained from the short-circuit voltage information acquired from the acquisition unit 131 is disturbed. Here, the analysis unit 137 outputs the short-circuit voltage waveform determination instruction information to the voltage waveform determination unit 135 when an overflow occurs in the short-circuit current waveform based on the overflow determination result.

Hereinafter, the process of determining whether or not the waveform of the short circuit voltage is disturbed will be described separately for a single-phase short circuit and a three-phase short circuit.
The case of a single-phase short circuit will be described.
FIG. 4 is a diagram showing an example (No. 2) of the operation of the short-circuit point setting system 100 of the embodiment.
FIG. 5 is a diagram showing an example (No. 3) of the operation of the short-circuit point setting system 100 of the embodiment.
4 and 5 show an example of a process in which the voltage waveform determination unit 135 determines the waveform of the short-circuit voltage.
4 and 5 show the case of a single-phase short circuit. In FIG. 4, the left figure of (1) shows the voltage waveform (upper) and the current waveform (lower) before the accident occurs, and the right figure of (1) shows the case where no overflow has occurred. The waveform of the short-circuit voltage (upper stage) and the waveform of the short-circuit current (lower stage) when both the short-circuit voltage and the short-circuit current are not disturbed are shown. The left figure of (2) shows the voltage waveform (upper) and current waveform (lower) before the accident occurs, and the right figure of (2) shows the case where an overflow has occurred and the short circuit voltage and short circuit. The short-circuit voltage waveform (upper stage) and the short-circuit current waveform (lower stage) are shown when there is no disturbance in both the current and the current. The left figure of (3) shows the voltage waveform (upper) and current waveform (lower) before the accident occurred, and the right figure of (3) shows the short-circuit voltage when an overflow occurs. The waveform of the short-circuit voltage (upper stage) and the waveform of the short-circuit current (lower stage) when there is no disturbance of the short-circuit current but there is a disturbance of the short-circuit current are shown.
In FIG. 5, the left figure shows the voltage waveform (upper) and the current waveform (lower) before the accident occurs, and the right figure shows the case where overflow occurs and the short-circuit voltage is disturbed. The waveform of the short-circuit voltage (upper stage) and the waveform of the short-circuit current (lower stage) when there is no disturbance of the short-circuit current are shown.
The voltage waveform determination unit 135 obtains short-circuit voltage waveforms (upper stage) as shown in FIGS. 4 (2) to (3) when an overflow occurs in the short-circuit current waveform in the case of a single-phase short circuit. If it is, it is judged that there is no disturbance.
Further, the voltage waveform determination unit 135 has an overflow in the short-circuit current waveform in the case of a single-phase short circuit, and has distortion as in the short-circuit voltage waveform (upper stage) in FIG. 5 or a cut in the voltage waveform. When a waveform containing turbulence such as is obtained, it is determined that there is turbulence.

The case of a three-phase short circuit will be described.
FIG. 6 is a diagram showing an example (No. 4) of the operation of the short-circuit point setting system 100 of the embodiment.
FIG. 7 is a diagram showing an example (No. 5) of the operation of the short-circuit point setting system 100 of the embodiment.
6 and 7 show an example of a process in which the voltage waveform determination unit 135 determines the waveform of the short-circuit voltage.
6 and 7 show the case of a three-phase short circuit. In FIG. 6, the left figure of (1) shows the voltage waveform (upper) and the current waveform (lower) before the accident occurs, and the right figure of (1) shows the case where no overflow has occurred. The waveform of the short-circuit voltage (upper stage) and the waveform of the short-circuit current (lower stage) when both the short-circuit voltage and the short-circuit current are not disturbed are shown. The left figure of (2) shows the voltage waveform (upper) and current waveform (lower) before the accident occurs, and the right figure of (2) shows the case where an overflow has occurred and the short circuit voltage and short circuit. The short-circuit voltage waveform (upper stage) and the short-circuit current waveform (lower stage) are shown when there is no disturbance in both the current and the current. The left figure of (3) shows the voltage waveform (upper) and current waveform (lower) before the accident occurred, and the right figure of (3) shows the case where an overflow has occurred and the short-circuit voltage is disturbed. However, the short-circuit voltage waveform (upper stage) and short-circuit current waveform (lower stage) when the short-circuit current is disturbed are shown.
In FIG. 7, the left figure shows the voltage waveform (upper) and the current waveform (lower) before the accident occurs, and the right figure shows the case where an overflow occurs and the short-circuit voltage is disturbed. , The short-circuit voltage waveform (upper stage) and the short-circuit current waveform (lower stage) when there is no disturbance of the short-circuit current are shown.
The voltage waveform determination unit 135 obtains short-circuit voltage waveforms (upper stage) as shown in FIGS. 6 (2) to (3) when an overflow occurs in the short-circuit current waveform in the case of a three-phase short circuit. If it is, it is judged that there is no disturbance.
Further, in the case of a three-phase short circuit, the voltage waveform determination unit 135 is disturbed when a waveform including distortion such as the short-circuit voltage waveform (upper stage) in FIG. 7 or disturbance such as a cut in the voltage waveform is obtained. It is determined that there is.
The voltage waveform determination unit 135 outputs a determination result (hereinafter referred to as “short circuit voltage determination result”) as to whether or not the short circuit voltage waveform is disturbed to the analysis unit 137. Returning to FIG. 2, the explanation will be continued.

The current waveform determination unit 136 acquires the short-circuit current information output by the acquisition unit 131. Further, the current waveform determination unit 136 acquires the short-circuit type information output by the short-circuit type determination unit 132. Further, when the current waveform determination unit 136 acquires the information instructing the determination of the short-circuit current waveform output by the analysis unit 137 (hereinafter referred to as “short-circuit current waveform determination instruction information”), the current waveform determination unit 136 acquires the information from the short-circuit type determination unit 132. Based on the short-circuit type information, it is determined whether or not the waveform of the short-circuit current obtained from the short-circuit current information acquired from the acquisition unit 131 is disturbed. Here, the analysis unit 137 outputs the short-circuit current waveform determination instruction information to the current waveform determination unit 136 when the waveform of the short-circuit voltage is not disturbed based on the short-circuit voltage determination result.

The current waveform determination unit 136 can obtain short-circuit current waveforms (lower stage) as shown in FIGS. 4 (2) and 5 when an overflow occurs in the short-circuit current waveform in the case of a single-phase short circuit. If so, it is judged that there is no disturbance. Further, the current waveform determination unit 136 obtained a short-circuit current waveform (lower stage) as shown in FIG. 4 (3) when an overflow occurred in the short-circuit current waveform in the case of a single-phase short circuit. In this case, it is determined that the short-circuit current waveform is disturbed because it contains distortion or disturbance such as a cut in the current waveform.

The current waveform determination unit 136 can obtain short-circuit current waveforms (lower stage) as shown in FIGS. 6 (2) and 7 when an overflow occurs in the short-circuit current waveform in the case of a three-phase short circuit. If so, it is determined that there is no disturbance. Further, the current waveform determination unit 136 is in the case of a three-phase short circuit, in which an overflow occurs in the short-circuit current waveform, and as shown in FIG. 6 (3), distortion and disturbance such as a cut in the current waveform If a waveform containing is obtained, it is determined that there is turbulence.
The current waveform determination unit 136 outputs a determination result (hereinafter referred to as “short-circuit current determination result”) as to whether or not the short-circuit current waveform is disturbed to the analysis unit 137. Returning to FIG. 2, the explanation will be continued.

The analysis unit 137 acquires the short-circuit voltage information output by the acquisition unit 131 and the short-circuit current information. Further, the analysis unit 137 acquires the overflow determination result output by the current value determination unit 134.
When the acquired overflow determination result indicates that no overflow has occurred in the short-circuit current waveform, the analysis unit 137 uses the peak value of the short-circuit current waveform based on the short-circuit current information acquired from the acquisition unit 131. Derive the effective value. The analysis unit 137 outputs information indicating the effective value of the derived short-circuit current to the short-circuit point extraction unit 138. Hereinafter, the method of deriving the effective value from the peak value of the waveform of the short-circuit current is referred to as an effective value calculation method.
When the waveform of the short-circuit current does not overflow, it corresponds to (1) in FIG. 4 and (1) in FIG. In this case, the analysis unit 137 obtains the crest value from the waveform (lower stage) of the short-circuit current between (1) of FIG. 4 and (1) of FIG. 6, and obtains the obtained crest value according to the equation (1). Convert to effective value.

I = Is / √2 (1)

In the equation (1), I is the short-circuit current effective value, and Is is the short-circuit current peak value.
FIG. 8 shows an example of a short-circuit current waveform in the case of a single-phase short circuit. In FIG. 8, the horizontal axis is time and the vertical axis is current [A]. When such a short-circuit current waveform is obtained, the peak value is 1750 A, so that the effective short-circuit current value is 1240 A. With this configuration, the peak value can be converted to the effective value used for short-circuit point determination. Although the case of a single-phase short circuit has been described with reference to FIG. 8, the effective short-circuit current value can be similarly derived in the case of a three-phase short circuit. Returning to FIG. 2, the explanation will be continued.

The analysis unit 137 creates short-circuit voltage waveform determination instruction information when the acquired overflow determination result indicates that an overflow has occurred in the short-circuit current waveform, and the created short-circuit voltage waveform determination instruction information is used as a voltage waveform. Output to the determination unit 135.
The analysis unit 137 acquires the short-circuit voltage determination result output by the voltage waveform determination unit 135, and when the acquired short-circuit voltage determination result indicates that the short-circuit voltage waveform is not disturbed, the analysis unit 137 outputs the short-circuit current waveform determination instruction information. The created and created short-circuit current waveform determination instruction information is output to the current waveform determination unit 136.
The analysis unit 137 acquires the short-circuit current determination result output by the current waveform determination unit 136, and when the acquired short-circuit current determination result indicates that the short-circuit current waveform is disturbed, the analysis unit 137 short-circuits based on the short-circuit voltage information. Analyze the current waveform.
Specifically, the analysis unit 137 derives the short-circuit current based on the voltage drop when the short-circuit occurs. Hereinafter, a method of deriving a short-circuit current based on a voltage drop when a short circuit occurs is referred to as a voltage drop method.
Specifically, when the short-circuit current waveform overflows and the short-circuit voltage is not disturbed, but the short-circuit current is disturbed, (3) in FIG. 4 and (3) in FIG. 6 It corresponds to 3). In this case, the analysis unit 137 obtains the voltage drop amount from the short-circuit voltage waveform (upper stage) of FIG. 4 (3) or FIG. 6 (3), and derives the short-circuit current from the obtained voltage drop amount.

FIG. 9 is a diagram showing an example (No. 6) of the operation of the short-circuit point setting system of the embodiment. FIG. 9 shows a process of deriving a short-circuit current by the voltage drop method.
The analysis unit 137 is based on the voltage value before the accident occurs, the current value, and the impedance information up to the measurement point stored in the distribution line impedance 123 of the storage unit 120, and the voltage value at the power supply end (sending voltage). ) Derivation of V.
The analysis unit 137 derives the short-circuit current peak value Is according to the equation (2).

Is = (V-Va2) / Z (2)

In the formula (2), V is the transmission voltage, Va2 is the voltage value measured by any one of the automatic switches 400-1 to 400-n, and Z is the automatic switches 400-1 to 400-1. It is the impedance on the substation 300 side from any automatic switch that has acquired the information of the automatic switch 400-n.
In this case, the percent impedance% Zs is represented by the equation (3).

% Zs = (√3IZ / 6600) x 100 (3)

From the formula (3), the reference current I = (10MVA / 6600) /√3=874.7A can be obtained.
Further, the transmission voltage V is derived according to the equation (4).

V = Va + (Z × Ia) (4)

In equation (4), Ia is the current value before the short circuit.
The analysis unit 137 derives the effective value of the short-circuit current from the derived short-circuit current peak value Is. The analysis unit 137 outputs information indicating the effective value of the derived short-circuit current to the short-circuit point extraction unit 138.
With this configuration, when a short circuit occurs, the short circuit current is derived based on the voltage drop obtained from the voltage value measured by any one of the automatic switch 400-1 to the automatic switch 400-n. can. Returning to FIG. 2, the explanation will be continued.

When the short-circuit voltage determination result acquired from the voltage waveform determination unit 135 indicates that the short-circuit voltage waveform is disturbed, the analysis unit 137 analyzes the short-circuit current waveform based on the acquired short-circuit current information.
Specifically, the analysis unit 137 derives the peak value of the short-circuit current based on the current value of the portion where the overflow of the waveform of the short-circuit current does not occur, and derives the effective value from the derived peak value. Hereinafter, the method of deriving the effective value of the short-circuit current based on the current value of the portion where the overflow of the short-circuit current waveform does not occur is referred to as a sine wave conversion method.
When the short-circuit current waveform overflows and the short-circuit voltage is disturbed, it corresponds to FIGS. 5 and 7. In this case, the analysis unit 137 derives the peak value of the short-circuit current from the short-circuit current waveform (lower stage) of FIG. 5 or 7 based on the current value of the portion where the short-circuit current waveform does not overflow. , The effective value is derived from the derived peak value.

FIG. 10 is a diagram showing an example (No. 7) of the operation of the short-circuit point setting system 100 of the embodiment.
FIG. 10 shows a process of deriving an effective value of a short-circuit current by a sine wave conversion method.
In FIG. 10, (1) shows an example of a short-circuit current waveform, the horizontal axis is time, and the vertical axis is current [A]. (2) shows the relationship between the phase angle θ and the current value i.
The analysis unit 137 extracts a portion other than the OVF portion (hereinafter referred to as “normal portion”) from the waveform of the short-circuit current. The analysis unit 137 derives the phase angle θ and the current value i for the extracted normal portion. Specifically, from the zero cross to the apex (90 degrees), the current peak value is derived for 1/4 of the data of the number of samples in one cycle. In the example shown in FIG. 10, in (1), the portion having a time of 0.08 or more is extracted. Then, as shown in (2), the case where the current value is 20 A when the phase angle is 30 degrees and the case where the current value is 10.35 A when the phase angle is 15 degrees are shown. ing.
The analysis unit 137 derives the current peak value Is from the equation (5) based on the derived phase angle θ and the current value i.

Is = i / sinθ (5)

The analysis unit 137 uses the maximum of the derived current peak values as the current peak value Is. The analysis unit 137 derives the effective value of the current based on the current peak value Is. The analysis unit 137 outputs information indicating the effective value of the derived current to the short-circuit point extraction unit 138.

In the example shown in FIG. 10, when the phase angle is 30 degrees and the current value is 20 A, Is = 40 is obtained by calculating Is = 20 / sin30. Further, when the phase angle is 15 degrees and the current value is 10.35 A, Is = 40 can be obtained by calculating Is = 10.35 / sin15.
With this configuration, the short-circuit current peak value can be derived based on the waveform of the short-circuit current obtained when a short-circuit occurs. Returning to FIG. 2, the explanation will be continued.
The analysis unit 137 acquires the short-circuit current determination result output by the current waveform determination unit 136, and when the acquired short-circuit current determination result indicates that the short-circuit current waveform is not disturbed, the analysis unit 137 is based on the short-circuit current information. Analyze the short-circuit current waveform. Specifically, the analysis unit 137 derives the effective value of the short-circuit current by both the voltage drop method and the sine wave conversion method described above. The analysis unit 137 adopts the larger value of the effective value of the short-circuit current derived by the voltage drop method and the effective value of the short-circuit current derived by the sinusoidal conversion method. The analysis unit 137 outputs information indicating the effective value of the adopted short-circuit current to the short-circuit point derivation unit 138.
The short-circuit point derivation unit 138 acquires the short-circuit type information output by the short-circuit type determination unit 132. Further, the short-circuit point derivation unit 138 acquires information indicating an effective value of the current output by the analysis unit 137. When the acquired short-circuit type information indicates a single-phase short circuit, the short-circuit point derivation unit 138 converts (converts) the effective value of the current into a three-phase short-circuit current based on the information indicating the effective value of the acquired current. do. The short-circuit current used in the short-circuit accident localization method is a three-phase short-circuit current. Therefore, when the short-circuit type determination unit 132 determines that the short-circuit type determination unit 132 is a single-phase short circuit, the short-circuit point derivation unit 138 converts the effective value of the current into a three-phase short-circuit current. Specifically, the short-circuit point derivation unit 138 multiplies the effective value of the current by 2 / √3. The short-circuit point derivation unit 138 defines a short-circuit point by finding a point where the effective value of the current converted into the three-phase short-circuit current and the short-circuit current derived from the impedance of the distribution line DL match.
On the other hand, when the short-circuit type information indicates a three-phase short circuit, the short-circuit point derivation unit 138 is derived from the effective value of the short-circuit current and the impedance of the distribution line DL based on the information indicating the effective value of the acquired current. The short-circuit point is defined by finding the point that matches the short-circuit current. Further, the short-circuit point derivation unit 138 ends the process when the short-circuit type information indicates an interphase ground fault short circuit. The short-circuit point derivation unit 138 outputs the result of defining the short-circuit point to the communication unit 110.

(Operation of short-circuit point determination system)
FIG. 11 is a flowchart showing an example (No. 1) of the operation of the short-circuit point setting system of the present embodiment.
In the example shown in FIG. 11, the short-circuit point determination system 100 determines the short-circuit type based on the short-circuit voltage information and the short-circuit current information.
(Step S1)
A protective relay (not shown) detects a short circuit.
(Step S2)
The communication unit 110 of the short-circuit point setting system 100 receives the measurement result transmitted by the distribution line system information management system 200, and outputs the received measurement result to the information processing unit 130. The acquisition unit 131 of the information processing unit 130 acquires the measurement result output by the communication unit 110, and outputs the short-circuit voltage information and the short-circuit current information included in the acquired measurement result to the short-circuit type determination unit 132.
(Step S3)
The short-circuit type determination unit 132 acquires the short-circuit voltage information and the short-circuit current information output by the acquisition unit 131, and based on the short-circuit current information of the acquired short-circuit voltage information and the short-circuit current information, the three-phase current. It is determined whether or not the rate of increase is X% or more.

(Step S4)
When it is determined that the current increase rate of the three phases is X% or more, the short circuit type determination unit 132 determines whether or not the voltage of the three phases is increasing based on the short circuit voltage information.
(Step S5)
If it is determined in step S4 that all of the three-phase voltages have not risen, the short-circuit type determination unit 132 determines that the three-phase short circuit has occurred.
(Step S6)
In step S3, when the three-phase current increase rate is not X% or more, that is, the three-phase current increase rate is less than X%, the short-circuit type determination unit 132 determines that the two-phase current increase rate is Y% or more. Determine if it exists. Here, X% and Y% may be the same or different.
(Step S7)
The short-circuit type determination unit 132 determines that the three-phase voltage has increased in step S4, or if the two-phase current increase rate is Y% or more in step S6, it is determined to be a single-phase short circuit. ..
(Step S8)
In step S6, the short-circuit type determination unit 132 causes the short-circuit type determination unit 132 to short-circuit between different phases when the two-phase current increase rate is not Y% or more, that is, when the two-phase current increase rate is less than Y%. Is determined.

FIG. 12 is a flowchart showing an example (No. 2) of the operation of the short-circuit point setting system 100 of the embodiment.
In the example shown in FIG. 12, the short-circuit point setting system 100 uses the short-circuit current information, the short-circuit current information, and the short-circuit voltage information as an effective value calculation method, a voltage drop method, and a sinusoidal wave. Of the conversion methods, select the method for deriving the effective value of the short-circuit current. Then, the short-circuit point determination system 100 searches for a short-circuit point based on the effective value of the short-circuit current derived by the selected method.
In FIG. 12, after the current value determination unit 134 acquires the short-circuit current information output by the acquisition unit 131, the voltage waveform determination unit 135 acquires the short-circuit voltage information output by the acquisition unit 131, and then the current waveform determination unit. After the 136 acquires the short-circuit current information output by the acquisition unit 131, the operation after the analysis unit 137 acquires the short-circuit voltage information output by the acquisition unit 131 and the short-circuit current information will be described.

(Step S11)
The current value determination unit 134 determines whether or not an overflow has occurred in the waveform of the short circuit current obtained from the acquired short circuit current information. The current value determination unit 134 outputs the overflow determination result to the analysis unit 137.
(Step S12)
The analysis unit 137 acquires the overflow determination result output by the current value determination unit 134. Based on the overflow determination result, the analysis unit 137 derives the effective value of the short-circuit current by the effective value calculation method when the waveform of the short-circuit current does not overflow. The analysis unit 137 obtains the peak value from the waveform of the short-circuit current, and converts the obtained peak value into an effective value. The analysis unit 137 outputs information indicating the effective value of the derived short-circuit current to the short-circuit point extraction unit 138.
(Step S13)
The analysis unit 137 acquires the overflow determination result output by the current value determination unit 134. The analysis unit 137 outputs short-circuit voltage waveform determination instruction information to the voltage waveform determination unit 135 when an overflow occurs in the short-circuit current waveform based on the overflow determination result. When the voltage waveform determination unit 135 acquires the short-circuit voltage waveform determination instruction information output by the analysis unit 137, the voltage waveform determination unit 135 determines whether or not the short-circuit voltage waveform obtained from the short-circuit voltage information acquired from the acquisition unit 131 is disturbed. judge. The voltage waveform determination unit 135 outputs the short-circuit voltage determination result to the analysis unit 137.

(Step S14)
The analysis unit 137 acquires the short-circuit voltage determination result output by the voltage waveform determination unit 135. Based on the short-circuit voltage determination result, the analysis unit 137 outputs the short-circuit current waveform determination instruction information to the current waveform determination unit 136 when the waveform of the short-circuit voltage is not disturbed.
When the current waveform determination unit 136 acquires the short-circuit current waveform determination instruction information output by the analysis unit 137, the current waveform determination unit 136 determines whether or not the short-circuit current waveform obtained from the short-circuit current information acquired from the acquisition unit 131 is disturbed. judge. The current waveform determination unit 136 outputs the short-circuit current determination result to the analysis unit 137.
(Step S15)
The analysis unit 137 acquires the short-circuit current determination result output by the current waveform determination unit 136. Based on the short-circuit current determination result, the analysis unit 137 derives the effective value of the short-circuit current by the voltage drop method when the waveform of the short-circuit current is disturbed. The analysis unit 137 derives a short-circuit current based on the voltage drop. The analysis unit 137 outputs information indicating the effective value of the derived short-circuit current to the short-circuit point extraction unit 138.
(Step S16)
The analysis unit 137 acquires the short-circuit current determination result output by the current waveform determination unit 136. Based on the short-circuit current determination result, the analysis unit 137 derives the effective value of the short-circuit current by the voltage drop method and the sinusoidal conversion method when the waveform of the short-circuit current is not disturbed. The analysis unit 137 adopts the larger value of the effective value of the short-circuit current derived by the voltage drop method and the effective value of the short-circuit current derived by the sinusoidal conversion method. The analysis unit 137 outputs information indicating the effective value of the adopted short-circuit current to the short-circuit point derivation unit 138.

(Step S17)
The analysis unit 137 acquires the short-circuit voltage determination result output by the voltage waveform determination unit 135. Based on the short-circuit voltage determination result, the analysis unit 137 derives the effective value of the short-circuit current by the sine wave conversion method when the waveform of the short-circuit voltage is disturbed. The analysis unit 137 derives the effective value of the short-circuit current based on the current value of the portion where the overflow of the short-circuit current waveform does not occur. The analysis unit 137 outputs information indicating the effective value of the derived short-circuit current to the short-circuit point extraction unit 138.
(Step S18)
The short-circuit point derivation unit 138 acquires the short-circuit type information output by the short-circuit type determination unit 132. Further, the short-circuit point derivation unit 138 acquires information indicating an effective value of the short-circuit current output by the analysis unit 137. When the acquired short-circuit type information indicates a single-phase short circuit, the short-circuit point derivation unit 138 converts (converts) the effective value of the current into a three-phase short-circuit current based on the information indicating the effective value of the acquired current. do. The short-circuit point derivation unit 138 defines a short-circuit point by finding a point where the effective value of the current converted into the three-phase short-circuit current and the short-circuit current derived from the impedance of the distribution line DL match. Further, when the short circuit type information indicates a three-phase short circuit, the short circuit point derivation unit 138 is derived from the effective value of the short circuit current and the impedance of the distribution line DL based on the information indicating the effective value of the acquired current. The short-circuit point is defined by finding the point that matches the short-circuit current. Further, the short-circuit point derivation unit 138 ends the process when the short-circuit type information indicates an interphase ground fault short circuit.

In the above-described embodiment, the case where the short-circuit point setting system 100 and the distribution line system information management system 200 are separate devices has been described, but the present invention is not limited to this example. For example, the short-circuit point setting system 100 and the distribution line system information management system 200 may be integrated.
In the above-described embodiment, the short-circuit point setting system 100 determines that the types of short circuits generated based on the short-circuit voltage information and the short-circuit current information are three-phase short circuit, single-phase short circuit, and heterogeneous ground fault short circuit. The case where it is automatically determined by image processing whether it is one of them has been described, but the present invention is not limited to this example. For example, the user may be made to visually determine and input the determination result. In this case, the short-circuit point determination system 100 performs processing based on the determination result input by the user.
In the above-described embodiment, the case where the short-circuit point setting system 100 automatically determines whether or not an overflow has occurred in the short-circuit current waveform by image processing has been described, but the present invention is not limited to this example. For example, the user may be made to visually determine and input the determination result. In this case, the short-circuit point determination system 100 performs processing based on the determination result input by the user.
In the above-described embodiment, the case where the short-circuit point setting system 100 automatically determines whether or not the short-circuit current waveform is disturbed by image processing has been described, but the present invention is not limited to this example. For example, the user may be made to visually determine and input the determination result. In this case, the short-circuit point determination system 100 performs processing based on the determination result input by the user.
In the above-described embodiment, the case where the short-circuit point setting system 100 automatically determines whether or not the short-circuit voltage waveform is disturbed by image processing has been described, but the present invention is not limited to this example. For example, the user may be made to visually determine and input the determination result. In this case, the short-circuit point determination system 100 performs processing based on the determination result input by the user.
In the above-described embodiment, when the effective value of the short-circuit current is derived by the sine wave conversion method, the analysis unit 137 sets the maximum current peak value Is as the current peak value Is among the plurality of derived current peak values. The case has been described, but it is not limited to this example. For example, the analysis unit 137 may use the average value of the derived current peak values as the current peak value Is or the intermediate value as the current peak value Is.
The short-circuit point setting system 100 of the embodiment can be applied to either an overhead distribution line in which an electric wire is connected to a utility pole or an underground distribution line in which a cable is buried in the ground.

According to the short-circuit point locating system 100 of the embodiment, the short-circuit point locating system 100 derives the effective value of the short-circuit current by the effective value calculation method. Specifically, the short-circuit point setting system 100 receives the measurement result transmitted by the distribution line system information management system 200 when a short-circuit occurs, and short-circuits based on the short-circuit current information included in the received measurement result. Derive the effective value of the current. The short-circuit point determination system 100 derives the distance to the short-circuit point by using the effective value of the derived short-circuit current and the impedance information of the stored distribution line DL. With this configuration, the effective value of the current can be derived based on the measurement result stored and transmitted by the automatic switch 400, so that the distance to the short-circuit point can be calculated.
Further, the short-circuit point setting system 100 derives an effective value of the short-circuit current by the voltage drop method. Specifically, the short-circuit point determination system 100 derives the sending voltage from the voltage value before the accident occurs, the current value, and the impedance information up to the stored measurement point. Further, the short-circuit point setting system 100 derives the amount of voltage drop caused by the short-circuit current based on the derived delivery voltage value and the voltage value after the short-circuit occurs. The short-circuit point determination system 100 derives an effective value of the short-circuit current from the derived voltage drop amount and the impedance information up to the automatic switch 400. The short-circuit point determination system 100 derives the distance to the short-circuit point by using the effective value of the derived short-circuit current and the impedance information of the stored distribution line. With this configuration, even if the measurement result of the short-circuit current stored and transmitted by the automatic switch 400 exceeds the upper limit of measurement and is excessive enough to draw a horizontal line near the upper limit, the current is effective. Since the value can be derived, the distance to the short circuit point can be calculated.
Further, the short-circuit point setting system 100 derives an effective value of the short-circuit current by a sinusoidal conversion method. Specifically, the short-circuit point setting system 100 extracts a portion other than the OVF portion from the waveform of the short-circuit current, and uses the measured value included in the extracted portion as the value of the fundamental sine wave corresponding to the phase of the measured value. By dividing by, the peak value of the current is derived. The short-circuit point determination system 100 derives the distance to the short-circuit point by using the effective value of the derived short-circuit current and the impedance information of the stored distribution line DL. With this configuration, the short-circuit voltage waveform has large defects and disturbances, and the short-circuit voltage value cannot be read. Therefore, even if the voltage drop amount cannot be used, the effective value of the current can be derived, resulting in a short-circuit. The distance to the point can be calculated.
Further, the short-circuit point setting system 100 derives the effective value of the current in the order of the effective value calculation method, the voltage drop method, and the sine wave conversion method when the short circuit of the distribution line DL occurs. The short-circuit point determination system 100 derives the distance to the short-circuit point by using the effective value of the derived short-circuit current and the impedance information of the stored distribution line DL. With such a configuration, the patrol time can be shortened as compared with the conventional case without making a large capital investment such as introducing an FL device.

<Configuration example>
As an example of the configuration, it is obtained from the acquisition unit that acquires the voltage measurement result and the current measurement result when a short circuit occurs from the distribution line system information management system, and the current measurement result acquired by the acquisition unit. The current value judgment unit that determines whether or not an overflow has occurred in the short-circuit current waveform, which is the current waveform when a short circuit occurs, and the voltage when a short circuit occurs, which is obtained from the measurement result of the voltage acquired by the acquisition unit. The voltage waveform determination unit that determines whether or not the short-circuit voltage waveform, which is a waveform, is disturbed, and whether or not the short-circuit current waveform obtained from the measurement result of the current acquired by the acquisition unit is disturbed. A short-circuit current waveform and a short circuit are obtained according to at least one judgment result of the current waveform judgment unit, the judgment result by the current value judgment unit, the judgment result by the voltage waveform judgment unit, and the judgment result by the current waveform judgment unit. Based on the effective value of the short-circuit current obtained by the analysis unit analyzing one or both of the voltage waveform and the analysis unit analyzing either one or both of the short-circuit current waveform and the short-circuit voltage waveform. , A short-circuit point determination system including a short-circuit point derivation unit for deriving a short-circuit point.
As an example of the configuration, the analysis unit determines that the short-circuit current waveform has overflow, and the voltage waveform determination unit determines that the short-circuit voltage waveform is not disturbed, and determines the current waveform. When the section determines that the short-circuit current waveform is disturbed, the voltage transmitted by the substation is based on the voltage value before the short-circuit occurs, the current value, and the impedance information to the measurement point. The value is derived, and the effective value of the short circuit current is derived based on the voltage value transmitted by the derived substation and the voltage value when the short circuit occurs.
As an example of the configuration, the analysis unit determines that the short-circuit current waveform has overflow, and the voltage waveform determination unit determines that the short-circuit voltage waveform is disturbed, and determines the current waveform. When the unit determines that the short-circuit current waveform is not disturbed, the peak value is derived based on the relationship between the instantaneous value and phase of the current derived from the short-circuit current waveform, and the peak value derived from the peak value is used. The effective value of the short-circuit current is derived.
As a configuration example, a short-circuit type determination unit for determining the type of short circuit based on the short-circuit voltage waveform acquired by the acquisition unit and the short-circuit current waveform is provided, and the short-circuit point derivation unit is a short circuit determined by the short-circuit type determination unit. The short circuit point is derived based on the type of.

Although the embodiments have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other embodiments, and various omissions, replacements, changes, and combinations can be made without departing from the gist of the invention. These embodiments are included in the scope and gist of the invention, and at the same time, are included in the scope of the invention described in the claims and the equivalent scope thereof.

The short-circuit point determination system 100 described above may be realized by a computer. In that case, a program for realizing the function of each functional block is recorded on a computer-readable recording medium. It may be realized by having a computer system read a program recorded on this recording medium and executing it by a CPU. The term "computer system" as used herein includes hardware such as an OS (Operating System) and peripheral devices.
Further, the "computer-readable recording medium" refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, or a CD-ROM. Further, the "computer-readable recording medium" includes a storage device such as a hard disk built in a computer system.

Further, the "computer-readable recording medium" may include a medium that dynamically holds the program for a short period of time. What dynamically holds the program for a short period of time is, for example, a communication line when the program is transmitted via a network such as the Internet or a communication line such as a telephone line.
Further, the "computer-readable recording medium" may include a medium that holds a program for a certain period of time, such as a volatile memory inside a computer system serving as a server or a client. Further, the above program may be for realizing a part of the above-mentioned functions. Further, the above-mentioned program may be realized by combining the above-mentioned functions with a program already recorded in the computer system. Further, the above program may be realized by using a programmable logic device. The programmable logic device is, for example, an FPGA (Field Programmable Gate Array).

The short-circuit point determination system 100 described above has a computer inside. The process of each process of the short-circuit point determination system 100 described above is stored in a computer-readable recording medium in the form of a program, and the process is performed by the computer reading and executing this program.
Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Further, this computer program may be distributed to a computer via a communication line, and the computer receiving the distribution may execute the program.
Further, the above program may be for realizing a part of the above-mentioned functions.
Further, a so-called difference file (difference program) may be used, which can realize the above-mentioned function in combination with a program already recorded in the computer system.

50 ... network, 100 ... short circuit point determination system, 110 ... communication unit, 120 ... storage unit, 121 ... program, 122 ... application, 123 ... distribution line impedance, 124 ... short circuit voltage information, 125 ... short circuit current information, 130 ... information Processing unit, 131 ... acquisition unit, 132 ... short circuit type determination unit, 134 ... current value determination unit, 135 ... voltage waveform determination unit, 136 ... current waveform determination unit, 137 ... analysis unit, 138 ... short circuit point derivation unit, 200 ... Distribution line system information management system, 300 ... Substation, 400, 400-1, 400-2, ..., 400-n ... Automatic switch, 500, 500-1, 500-2, ..., 500- n ... Remote control device

Claims (6)

An acquisition unit that acquires voltage measurement results and current measurement results when a short circuit occurs from the distribution line system information management system.
A current value determination unit that determines whether or not an overflow has occurred in the short-circuit current waveform, which is a current waveform when a short circuit occurs, which is obtained from the current measurement result acquired by the acquisition unit.
A voltage waveform determination unit that determines whether or not a disturbance has occurred in the short-circuit voltage waveform, which is a voltage waveform when a short circuit occurs, which is obtained from the measurement result of the voltage acquired by the acquisition unit.
A current waveform determination unit that determines whether or not the short-circuit current waveform obtained from the current measurement result acquired by the acquisition unit is disturbed, and a current waveform determination unit.
The short-circuit current waveform and the short-circuit voltage waveform correspond to at least one determination result of the determination result by the current value determination unit, the determination result by the voltage waveform determination unit, and the determination result by the current waveform determination unit. An analysis unit that analyzes one or both of the above, and
The analysis unit includes a short-circuit point derivation unit that derives a short-circuit point based on an effective value of the short-circuit current obtained by analyzing one or both of the short-circuit current waveform and the short-circuit voltage waveform. , Short circuit point determination system. The analysis unit determines that the short-circuit current waveform has an overflow, the voltage waveform determination unit determines that the short-circuit voltage waveform is not disturbed, and the current waveform. When the determination unit determines that the short-circuit current waveform is disturbed, the substation transmits power based on the voltage value before the short-circuit occurs, the current value, and the impedance information to the measurement point. The short-circuit point according to claim 1, wherein the voltage value is derived, and the effective value of the short-circuit current is derived based on the voltage value transmitted by the derived substation and the voltage value when a short circuit occurs. Positioning system. The analysis unit determines that the short-circuit current waveform has an overflow, the current value determination unit determines that the short-circuit current waveform has an overflow, and the voltage waveform determination unit determines that the short-circuit voltage waveform is disturbed. When the determination unit determines that the short-circuit current waveform is not disturbed, the peak value is derived and the derived wave is derived based on the relationship between the instantaneous value and the phase of the current derived from the short-circuit current waveform. The short-circuit point setting system according to claim 1 or 2, wherein the effective value of the short-circuit current is derived from the high value. A short-circuit type determination unit for determining the type of short-circuit based on the short-circuit voltage waveform acquired by the acquisition unit and the short-circuit current waveform is provided.
The short-circuit point determination system according to any one of claims 1 to 3, wherein the short-circuit point derivation unit derives a short-circuit point based on the type of the short-circuit determined by the short-circuit type determination unit. A step to acquire the voltage measurement result and the current measurement result when a short circuit occurs from the distribution line system information management system.
A step of determining whether or not an overflow has occurred in the short-circuit current waveform, which is a current waveform when a short-circuit occurs, which is obtained from the measurement result of the current acquired in the acquisition step.
A step of determining whether or not a disorder has occurred in the short-circuit voltage waveform, which is a voltage waveform when a short circuit occurs, which is obtained from the measurement result of the voltage acquired in the acquisition step.
A step of determining whether or not the short-circuit current waveform obtained from the current measurement result acquired in the acquisition step is disturbed, and a step of determining whether or not the short-circuit current waveform is disturbed.
The determination result of whether or not the short-circuit current waveform has overflow, the determination result of whether or not the short-circuit voltage waveform is disturbed, and whether or not the short-circuit current waveform is disturbed. A step of analyzing one or both of the short-circuit current waveform and the short-circuit voltage waveform according to at least one determination result of the determination result.
A computer having a step of deriving a short-circuit point based on an effective value of the short-circuit current obtained by analyzing one or both of the short-circuit current waveform and the short-circuit voltage waveform in the analysis step. The short-circuit point determination method performed by. On the computer
A step to acquire the voltage measurement result and the current measurement result when a short circuit occurs from the distribution line system information management system.
A step of determining whether or not an overflow has occurred in the short-circuit current waveform, which is a current waveform when a short-circuit occurs, which is obtained from the measurement result of the current acquired in the acquisition step.
A step of determining whether or not a disorder has occurred in the short-circuit voltage waveform, which is a voltage waveform when a short circuit occurs, which is obtained from the measurement result of the voltage acquired in the acquisition step.
A step of determining whether or not the short-circuit current waveform obtained from the current measurement result acquired in the acquisition step is disturbed, and a step of determining whether or not the short-circuit current waveform is disturbed.
The determination result of whether or not the short-circuit current waveform has overflow, the determination result of whether or not the short-circuit voltage waveform is disturbed, and whether or not the short-circuit current waveform is disturbed. A step of analyzing one or both of the short-circuit current waveform and the short-circuit voltage waveform according to at least one determination result of the determination result.
A program for executing a step of deriving a short-circuit point based on an effective value of the short-circuit current obtained by analyzing one or both of the short-circuit current waveform and the short-circuit voltage waveform in the analysis step. ..

Images