JP6600511B2 - Fault location system and fault location method for DC railway feed circuit - Google Patents

Description

  The present invention relates to a fault location system and a fault location method for a DC railway feed circuit.

  In the case of a failure, etc., in a DC railway feed circuit that supplies DC voltage to a train that runs in a section between two substations, the circuit breaker is activated to stop supplying DC voltage in that section. There is technology.

  In such a supply stop process of DC voltage to the failure section, a failure point locating method (or failure point locating system) for locating failure points such as failures by calculation in order to shorten the time from failure occurrence to restoration. In the past, various methods have been proposed.

  For example, Patent Document 1 discloses a fault location system and a fault location method for a DC railway feeding circuit that can perform fault location with high accuracy even when the values of transmitted voltages at two substations are different. Is disclosed.

In the fault location system described in Patent Document 1, various constants are
Lx: Distance from one substation to the failure point L: Distance between substations Ea: Sending voltage of one substation (voltage between commutators PN)
Eb: Sending voltage of the other substation (voltage between commutators PN)
ia: Sending current (failure current) of one substation
ib: Sending current (fault current) of the other substation
l: Line inductance per unit length (km) la: Internal inductance of one substation lb: When assuming the internal inductance of the other substation, from one substation to the failure point according to the standard formula shown below The distance Lx can be determined.

  However, the voltage actually measured at the substation is the voltage Ea ′, Eb ′ between the substation bus and the rail, and the voltage Ea ′, Eb ′ and the voltage Ea, Eb between the commutator PNs of the substation. Relationship

で表される。［数１］の標定式を、このように実際に測定される変電所母線〜レール間の電圧Ｅａ’、Ｅｂ’を用いて表した標定式は、

It is represented by The standard formula that expresses the standard formula of [Equation 1] using the voltages Ea ′ and Eb ′ between the substation bus and the rail that are actually measured in this way is:

となる。
そして、［数３］の標定式を用いて標定することにより、［数１］の標定式を用いる場合と比較して標定誤差を改善することができる。

It becomes.
And by standardizing using the standard formula of [Equation 3], the standardization error can be improved as compared with the case of using the standard formula of [Equation 1].

JP 2014-196911 A

  However, since the fault current in the DC railway feed circuit suddenly rises in a short time of about 10 ms, the voltage drop generated in the substation internal inductance becomes large. Although the voltage of the bus at the substation varies greatly due to such a voltage drop, the voltage measuring instrument installed in the DC substation generally has a slow response speed (about 500 ms). Cannot measure following the voltage drop.

  In this way, the voltage value that has not been able to follow the voltage drop measured by the voltage measuring device having a slow response speed is substituted into the substation transmission voltage (E′a or E′b) of the standard formula of [Equation 3]. When the orientation is performed, there is a problem that a large error is included in the distance Lx to the failure point to be oriented.

  Of course, if a conventional voltage measuring device with a slow response speed is replaced with a voltage measuring device with a fast response speed, a voltage value following a steep voltage drop can be measured. For this reason, if the measured value is assigned to the substation transmission voltage (E′a or E′b) of the standardization formula of [Equation 3], the fault point can be accurately determined. Since the voltage measuring device having a high response speed is expensive, there is a problem that the installation of such a voltage measuring device at each substation leads to an increase in cost.

  An object of the present invention is to provide a fault location system and a fault location method for a DC railway feeding circuit capable of performing fault location more accurately without incurring a cost increase.

Ｌｘ：一方の変電所から故障点までの距離
Ｌ：変電所間距離
Ｅ’ａ：一方の変電所の送出電圧（変電所母線〜レール間）
Ｅ’ｂ：他方の変電所の送出電圧（変電所母線〜レール間）
ｉａ：一方の変電所の送出電流（故障電流）
ｉｂ：他方の変電所の送出電流（故障電流）
ｌ：単位長さ（ｋｍ）あたりの線路インダクタンス
ｌａ：一方の変電所の内部インダクタンス
ｌｂ：他方の変電所の内部インダクタンス
に入れて計算し、故障点を標定して結果を表示する故障点標定装置と
を備えるようにしたものである。 In order to achieve the above object, the present invention provides:
A fault location system in a DC railway feeding circuit that supplies DC voltage to a traveling train from at least two substations,
Each substation is
A voltage measuring device for measuring the sending voltage;
A current measuring device for measuring the sending current;
A clock device capable of measuring time and outputting time information;
An information processing device that periodically acquires the transmission voltage, the transmission current, and the time information and stores them as time-series information, and transmits the time-series information stored when a failure occurs, and
The time series information at each substation is received from the information processing device, and the transmission voltage and the transmission current at each substation corresponding to the time information included in the time series information are within a predetermined time width. The sending voltage and the sending current are extracted, the sending voltage and the sending current of each extracted substation are averaged, and the sending voltage and the sending current of each averaged substation are standardized. formula

Lx: Distance from one substation to the failure point L: Distance between substations E'a: Transmission voltage of one substation (between substation bus and rail)
E'b: Sending voltage of the other substation (between substation bus and rail)
ia: Sending current (failure current) of one substation
ib: Sending current (fault current) of the other substation
l: Line inductance per unit length (km) la: Internal inductance of one substation lb: Calculation by putting in the internal inductance of the other substation, fault location and displaying the result And so on.

  Even if the response speed of the voltage measuring instrument used in the fault location system is slower than that of the current measuring instrument, the output voltage measured by the voltage measuring instrument with the slower response speed is By applying to the above-mentioned orientation formula corrected by the current, it is not necessary to replace the voltage measuring device with a fast response speed, and the location of the failure point can be more accurately determined without increasing the cost.

Ｌｘ：一方の変電所から故障点までの距離
Ｌ：変電所間距離
Ｅ’ａ：一方の変電所の送出電圧（変電所母線〜レール間）
Ｅ’ｂ：他方の変電所の送出電圧（変電所母線〜レール間）
ｉａ：一方の変電所の送出電流（故障電流）
ｉｂ：他方の変電所の送出電流（故障電流）
ｌ：単位長さ（ｋｍ）あたりの線路インダクタンス
ｌａ：一方の変電所の内部インダクタンス
ｌｂ：他方の変電所の内部インダクタンス
に入れて計算し、故障点を標定するステップと
を含むようにしたものである。 In addition, other inventions of the present application are:
A fault location method in a DC railway feed circuit that supplies a DC voltage from at least two substations to a traveling train,
A step of periodically acquiring the transmission voltage, transmission current and time information of each substation and storing it as time series information,
Extracting the transmission voltage and the transmission current included in a predetermined time width from the transmission voltage and the transmission current of each substation stored corresponding to the time information when a failure occurs; and
Performing an averaging process on the transmission voltage and the transmission current of each extracted substation;
The transmission voltage and the transmission current of each substation subjected to the averaging process

Lx: Distance from one substation to the failure point L: Distance between substations E'a: Transmission voltage of one substation (between substation bus and rail)
E'b: Sending voltage of the other substation (between substation bus and rail)
ia: Sending current (failure current) of one substation
ib: Sending current (fault current) of the other substation
l: Line inductance per unit length (km) la: Internal inductance of one substation lb: Calculated by inserting into the internal inductance of the other substation, and including the step of locating the failure point is there.

  Even if the response speed of the voltage measuring instrument being used is slower than that of the current measuring instrument, the above-mentioned correction is made so that the output voltage measured by the voltage measuring instrument having a slow response speed is corrected by the measured output current. By applying to the orientation formula, it is not necessary to replace the voltage measuring device with a fast response speed, and the location of the failure point can be more accurately determined without increasing the cost.

  According to the present invention, transmission voltages, transmission currents, and time information at two substations are acquired, and when a failure occurs, transmissions included in a predetermined time width from the transmission voltage and the transmission current based on the time information. The voltage and the sending current are extracted, the extracted sending voltage and the sending current are averaged, and the sending voltage measured by the voltage measuring device with a slow response speed is calculated based on the averaging sending voltage and the sending current. By applying it to a standardization formula that corrects the measured output current, it is not necessary to replace it with a voltage measuring instrument with a fast response speed, and it is possible to perform fault location more accurately without increasing costs. it can.

It is a schematic block diagram which shows an example of a structure of the fault location system of the DC railway feeder circuit which concerns on this Embodiment. It is a block diagram which shows an example of structures, such as information processing apparatus of the DC railway feeder circuit which concerns on this Embodiment. It is a block diagram which shows an example of a structure of the failure point location apparatus of the DC railway feeder circuit which concerns on this Embodiment. It is a flowchart which shows an example of operation | movement of a failure point location system. It is explanatory drawing which shows an example of the time fluctuation | variation of sending electric current. It is a circuit diagram which shows the equivalent circuit of a DC railway feeder circuit when a failure occurs. It is explanatory drawing which shows an example of the waveform of a sending voltage, sending current, and a measurement voltage.

[1. Description of configuration]
Hereinafter, a fault location system and a fault location method for a DC railway feeding circuit according to an embodiment of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following examples.

(Embodiment)
FIG. 1 is a schematic configuration diagram showing a configuration example of a fault location system 100 for a DC railway feed circuit.
In a DC railway feed circuit that supplies a DC voltage to a train 1 traveling in a section sandwiched between two substations 50 and 51 shown in FIG. 1, the train 1 is connected to a train line 2 by a pantograph that is a current collector of the train 1. The vehicle travels on the return line 3 (hereinafter referred to as a rail) by receiving supply of a DC voltage from the overhead line (hereinafter referred to as an overhead line) and rotating a motor (not shown) of the train 1 by the DC voltage. The rectifiers 4 and 5 convert alternating current received by the substations 50 and 51 into direct current and supply the direct current between the overhead wire 2 and the rail 3. Furthermore, the substations 50 and 51 are respectively provided with circuit breakers 61 and 62 for interrupting the supply of voltage to the overhead line in the failure occurrence section when a failure or the like occurs.

  The sending voltage and sending current in the rectifier 4 (failure current when a failure occurs) are measured by the measuring devices 6 and 7 installed in the substations 50 and 51, respectively, and the measured data is sent to the substation 50. It is acquired by the installed information processing devices 52 and 53 and stored in the storage device. At this time, the information processing devices 52 and 53 sequentially store the data of the transmission voltage and the transmission current together with the time information measured by the GPS (Global Positioning System) clock devices 8 and 9 installed in the substations 50 and 51. .

  Further, in the system of the present embodiment, the remote control device 12 is provided, and the communication means 10 and 11 for transmitting data to the information processing devices 52 and 53 are provided, and the remote control device 12 and the information processing device 52 are provided. And 53 are connected to each other by a transmission line so that data can be transmitted and received. The remote control device 12 is installed in a control station 54 provided to monitor the substation from a distance, and is installed in the substations 50 and 51 on the controlled side in response to a command from the remote control device 12 or the like. The information processing devices 52 and 53 are configured to be controlled.

  FIG. 2 is a block diagram illustrating functions of the information processing device 52 and the like installed in the substation 50. As shown in FIG. 2, a substation 50 is provided with a current and voltage measuring device 6, a GPS clock device 8, and an information processing device 52. The information processing device 52 includes a control means 15, an input means 16, The storage unit 17 and the communication unit 10 are included. The information processing device 53 installed in the substation 51 has the same configuration as that shown in FIG.

  The control unit 15 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and a program stored in the ROM or the storage unit 17 expanded in the work area of the RAM. Each means is centrally controlled by the cooperation of data and CPU.

The input means 16 corresponds to the current measuring device 13 that is the measuring device 6, the sending current (including the fault current) measured by the voltage measuring device 14, the sending voltage, and the time information measured by the GPS clock device 8. The obtained signal is acquired, converted into a digital signal, and input to the control means 15.
Specifically, the input unit 16 includes an input buffer, an A / D conversion circuit that converts a signal (analog signal) acquired by the input buffer into a digital signal, and the like. The input means 16 may acquire various data directly as digital data from the current measuring device 13, the voltage measuring device 14, and the GPS timepiece device 8.

  The storage means 17 stores data such as program data and various setting data so as to be readable and writable from the control means 15. For example, the storage unit 17 is an HDD (Hard Disk Drive), a semiconductor memory, or the like, and sequentially stores the transmission voltage, the transmission current, and the time information in the rectifier 4 captured from a voltage measuring device or the like.

  The control means 15 has a function of detecting the occurrence of a failure or the like based on the transmission voltage and transmission current between the substation bus and the rail taken in from a voltage measuring device or the like. The means 10 transmits data such as the sending voltage, sending current, and time information stored in the storage means 17 to the remote control device 12 installed in the control station 54 via a transmission line or a network. The communication unit 10 may be a wireless communication unit.

  FIG. 3 is a block diagram showing the function of the fault location device 55 installed at the control station 54. As shown in FIG. 3, the failure point location device 55 includes a control unit 19, a communication unit 20, a storage unit 21, and a display unit 22.

  The control means 19 has a CPU, a ROM, a RAM, and the like, and performs overall control of each means by cooperation of the CPU and program data stored in the ROM or storage means 21 developed in the RAM work area.

  The communication unit 20 receives data such as a transmission voltage, a transmission current, and time information transmitted from the substation 50 or 51 and inputs the data to the control unit 19.

  The storage means 21 stores data such as program data and various setting data in a state where the data can be read and written from the control means 19. For example, the storage means 21 is an HDD, a semiconductor memory, or the like, and includes various information such as an interval between two substations, an inductance value inside each substation, a resistance value per unit length (km) of the overhead wire, and an inductance value. In addition, an orientation formula for failure point location is stored in advance. The program data includes a calculation program (standardization formula) for standardizing the failure point. Further, the storage means 21 also stores the value of the internal inductance of the power transmission circuit of each substation, the distance L between substations, the coefficient used for the orientation formula, and the like that are measured or calculated in advance.

  The display unit 22 displays information and an image based on the display control signal output from the control unit 19 on a display screen, and is configured by, for example, a CRT (Cathode Ray Tube) or an LCD (Liquid Crystal Display). . An FPD (Flat Panel Display) using an organic EL (Electro Luminescence) element may be used.

[2. Explanation of operation]
Here, the description of the specific procedure of the failure point location processing by the information processing device 52 and the failure point location device 55 constituting the failure point location system 100 in the embodiment of the present invention is shown in FIG. 4, FIG. 5, FIG. 7 in detail. 4, steps S1 to S4 are processing by the information processing device 52 at the substation, and steps S5 to S8 are processing by the fault location device 55 at the control station. However, since the operation of the information processing device 53 installed in the substation 51 is the same as the operation of the information processing device 52 installed in the substation 50, a duplicate description is omitted.

  As shown in the flowchart of FIG. 4, the control means 15 of the information processing device 52 installed in the substation 50 determines the transmission voltage and the transmission current between the substation bus and the rail, which are measured by the measuring devices 6 and 7, respectively. Obtained at regular intervals and simultaneously stored in the storage means 17 together with the time information obtained from the GPS clock device 8 (step S1).

  Then, the control means 15 of the information processing device 52 determines whether or not a fault FA has occurred in the electric railway circuit based on the measured change in the transmission current (step S2). When it is determined that it has not been performed (step S2: No), the process returns to step S1, and the acquisition and storage of the data of the transmission voltage, the transmission current, and the time information are repeatedly performed.

  On the other hand, when it is determined that a failure FA has occurred (step S2: Yes), the control unit 15 of the information processing device 52 stops acquiring the data of the transmission voltage, the transmission current, and the time information (step S3), and the storage unit. The transmission voltage, transmission current, and time information history data stored at 17 in the substation 50 is transmitted to the control station 54 by the communication means 10 (step S4). Further, when the control means of the information processing device 53 installed in the substation 51 also detects that a fault FA has occurred, the sending voltage, sending current and time information in the substation 51 stored in the storage means. Is transmitted to the control station 54 by the communication means 11.

  On the other hand, the communication means 20 of the control station 54 receives the data transmitted from the substations 50 and 51 and passes the data to the control means 19 of the failure point locating device 55. Then, the control unit 19 stores the received transmission voltage, transmission current, and time information data in the substations 50 and 51 in the storage unit 21 and is included in a predetermined time width from the data based on the time information. Data on the sending voltage and sending current is extracted (step S5).

  For example, FIG. 5 is an explanatory diagram showing an example of temporal variation of the transmission current (failure current). As shown in FIG. 5, even when a failure FA occurs at time T0, the transmission current CT is immediately It does not flow out, its current value is zero, and then the current value of the delivery current CT changes so as to increase sequentially until the time TD when the circuit breaker is activated.

  However, data is expected to be disturbed in the vicinity of the failure occurrence time T0 in FIG. 5, and it is not appropriate to use such data for fault location, and it is preferable to remove the unnecessary data.

Therefore, the control means 19 of the failure point locating device 55 does not use unnecessary data immediately after the time T0 when the failure FA occurs, and as shown in FIG. 5, each after a predetermined time has elapsed from the failure occurrence time T0. Time T1 and time T2 are set in advance, and data included between time T1 and time T2 is extracted from the acquired data and used for orientation.
Then, the control means 19 of the failure point locating device 55 performs an averaging process on the extracted transmission voltage and transmission current (step S6), and applies the averaged transmission voltage and transmission current to the orientation formula to determine the failure point. Orientation is performed (step S7).

  Specifically, as the averaging process, the measured values of the sending voltage and the sending current in the specific time width T3 in FIG. 5 among the sending voltage and the sending current included in the extracted time zone from time T1 to T2 are used. Move average processing.

  Noise and ripples are superimposed on the extracted send voltage and send current, which may cause errors in fault location. It is possible to remove a cyclic or irregular fluctuation portion in the current, and thereby it is possible to accurately determine the fault point.

  Here, the failure point orientation formula will be described. FIG. 6 is a circuit diagram showing an equivalent circuit of a DC railway feeder circuit when a failure or the like occurs. In FIG. 6, the transmission voltage Ea of the substation 50 is applied to the overhead wire 2 via the internal inductance la of the substation 50. Similarly, in FIG. 6, the transmission voltage Eb of the substation 51 is applied to the overhead wire 2 via the internal inductance lb of the substation 51. Also, send currents (failure currents) ia and ib are sent from the substations 50 and 51, respectively.

Here, the distance from the substation 50 to the failure point PT is “Lx”, the distance between the substations 50 and 51 is “L”, and the resistance value and inductance value per unit length (km) of the overhead wire 2 are “r”. And “l”, the resistance and inductance of the overhead line 2 from the substation 50 to the failure point PT are “rLx” and “lLx”, and the resistance and inductance of the overhead line 2 from the substation 51 to the failure point PT are , “R (L−Lx)” and “l (L−Lx)”.
Note that at the failure point PT, the overhead wire 2 can be regarded as being connected to the rail 3 via the failure point resistance rg and the failure point arc voltage e.

  FIG. 7 is an explanatory diagram showing an example of waveforms of the send voltage, send current, and measurement voltage. The send current (failure current) CT71 rises rapidly in a short time of about 10 ms, while the send voltage VT71 also Due to the voltage drop generated in the substation internal inductance, a large and steep fluctuation DR71 appears in the bus voltage of the substation.

On the other hand, the transmission voltages actually measured by the measuring devices 6 and 7 are the transmission voltages Ea ′ and Eb ′ between the substation bus and the rail, and measured by a conventional voltage measuring device with a slow response speed. Sending voltage.
For example, as shown by a measured voltage VT72 in FIG. 7, since it is measured by a voltage measuring device with a slow response speed, the fluctuation DR71 of the bus voltage at the substation generated by the transmission voltage VT71 is not captured at all.

  That is, the transmission voltages Ea ′ and Eb ′ that are actually measured by the measuring devices 6 and 7 are considered to be substantially the same value with little fluctuation between several tens of milliseconds before and after the accident. Correction is made such that the fluctuation DR71 is added to the sending voltages Ea ′ and Eb ′.

  Specifically, using the measured transmission currents (failure currents) ia and ib, assuming [Equation 6] in consideration of the fluctuation DR71 of the bus voltage of the substation, the transmission voltages Ea ′ and Eb ′ are Replace.

  In [Equation 6], each second term (differential term of ia and ib) represents the contribution of the voltage drop generated in the substation internal inductances la and lb due to the temporal variation of the sending currents (failure currents) ia and ib. Represents. For this reason, the transmission voltage corrected by the second term has a portion corresponding to the fluctuation DR71 of the bus voltage of the substation, and can be approximated to the waveform of the transmission voltage VT71.

  Here, when the transmission voltages Ea ′ and Eb ′ in [Equation 3] are replaced with the transmission voltages Ea′−la × dia / dt and Eb′−lb × dib / dt in [Equation 6], Become.

  That is, by using the standard formula shown in [Equation 7], even when the transmission voltages Ea ′ and Eb ′ measured by a voltage measuring device with a slow response speed are substituted, the measured transmission current (failure current) ) Since ia and ib are used to take into account the change of the bus voltage DR71 of the substation, the orientation error can be suppressed.

  Here, [Table 1] shows the location error of the fault location system of the DC railway feeding circuit according to the present embodiment using the orientation formula shown in [Equation 7] and the orientation error of the conventional fault location system. Is confirmed by a waveform obtained by simulation.

  In [Table 1], the example is a case where the standard formula of [Equation 7] is used, and the comparative example is a case where the standard formula of [Formula 3] is used. In addition, “with” following the actual voltage means that the transmission voltage Ea ′, Eb ′ (corresponding to the transmission voltage VT71 in FIG. 7) measured by a voltage measuring device with a fast response speed is substituted into the actual voltage when substituted. The follow-up “none” indicates a case where the transmission voltages Ea ′ and Eb ′ (corresponding to the measured voltage VT72 in FIG. 7) measured by a conventional voltage measuring device with a slow response speed are substituted into the standard expression.

  As can be seen from [Table 1], even in the comparative example, the sending voltages Ea ′ and Eb ′ (corresponding to the sending voltage VT71 in FIG. 7) measured by the voltage measuring device having a fast response speed were substituted into the standardized formula. In this case, although the orientation error is kept low, the sending voltages Ea ′ and Eb ′ (corresponding to the measured voltage VT72 in FIG. 7) measured by a conventional voltage measuring device with a slow response speed are substituted into the orientation formula. In some cases, the orientation error becomes extremely large.

  On the other hand, in the embodiment, even when the transmission voltages Ea ′ and Eb ′ (corresponding to the measured voltage VT72 in FIG. 7) measured by a conventional voltage measuring device with a slow response speed are substituted into the standardization formula. The orientation error can be suppressed to one digit, the failure point can be located more accurately, and the effectiveness of the orientation formula of [Equation 7] can be confirmed.

  That is, a conventional voltage measuring device with a slow response speed can be replaced with a voltage measuring device with a fast response speed, and the failure point can be determined with higher accuracy without incurring a cost increase.

  As described above, according to the present invention, the transmission voltage, transmission current, and time information at the two substations are acquired, and when a failure occurs, a predetermined time is selected from the transmission voltage and the transmission current based on the time information. The transmission voltage and the transmission current included in the width are extracted, and the extracted transmission voltage and the transmission current are averaged. Based on the averaged transmission voltage and the transmission current, the measurement is performed by a voltage measuring device having a slow response speed. By applying the measured output voltage to a standard formula that corrects the measured output current, it is not necessary to replace the voltage measuring device with a fast response speed, and the failure point can be determined more accurately without increasing costs. It can be performed.

  In the description of the embodiment, it is described that the fault location determination result is displayed on the display unit 22 of the fault location apparatus 55. However, the operator or the operator can simply display the orientation result. Since the possibility of overlooking the display cannot be denied, the fault location determination result may be displayed together with an alarm (alarm display or alarm by sounding). In this case, the operator and the operator are alerted by the alarm, so that the display content of the display means can be confirmed immediately, and the orientation result can be prevented from being overlooked.

Further, in the embodiment, a case has been described in which a failure that causes the circuit breaker of the substation to operate has occurred. However, the present invention provides relatively rapid fluctuations in the transmission current and the transmission voltage that do not lead to the operation of the circuit breaker. The present invention can be applied to the case where an abnormality involving the occurrence of an abnormality occurs and the location of the abnormality occurrence.
Furthermore, in the embodiment, it has been described that the data extraction of the predetermined time width in step S5 and the averaged processing of the extracted data in step S6 of the flowchart of FIG. The data extraction and the average processing of the extracted data are performed by the information processing devices 52 and 53 of the substations 50 and 51, and the data obtained by the averaging processing is transmitted to the fault location device 55 of the control station 54. The point locating device 55 may be configured to determine the failure point by using the orientation formula of [Equation 7].

1 Train 2 Train line (overhead line)
3 Return line (rail)
4, 5 Rectifier 6, 7 Measuring device 8, 9 GPS clock device 10, 11 Communication means 12 Remote control device 13 Current measuring device 14 Voltage measuring device 15, 19 Control means 16 Input means 17, 21 Storage means 20 Communication means 22 Display Means 50, 51 Substation 52, 53 Information processing device 54 Control station 55 Fault location device 61, 62 Breaker 100 Fault location system

Claims (2)

A fault location system in a DC railway feeding circuit that supplies DC voltage to a traveling train from at least two substations,
Each substation is
A voltage measuring device for measuring the sending voltage;
A current measuring device for measuring the sending current;
A clock device that clocks time and clocks time information;
An information processing apparatus that periodically acquires the transmission voltage, the transmission current, and the time information and stores the time information as time series information, and transmits the time series information stored when a failure occurs;
The current measuring device is a measuring device having a response speed of 10 ms or less, and the voltage measuring device is a measuring device having a slower response speed than the current measuring device,
The time series information at each substation is received from the information processing device, and the transmission voltage and the transmission current at each substation corresponding to the time information included in the time series information are within a predetermined time width. The sending voltage and the sending current are extracted, the sending voltage and the sending current of each extracted substation are averaged, and the sending voltage and the sending current of each averaged substation are standardized. formula

Lx: Distance from one substation to the failure point L: Distance between substations E'a: Sending voltage of one substation ( voltage between substation bus and rail)
E'b: Sending voltage of the other substation ( voltage between substation bus and rail)
ia: Sending current (failure current) of one substation
ib: Sending current (fault current) of the other substation
l: Line inductance per unit length (km) la: Internal inductance of one substation lb: Calculation by putting in the internal inductance of the other substation, fault location and displaying the result And a fault location system characterized by comprising: A fault location method in a DC railway feed circuit that supplies a DC voltage from at least two substations to a traveling train,
Using a current measuring device with a response speed of 10 ms or less and a voltage measuring device with a slower response speed than the current measuring device, the bus-to-rail voltage and the bus-to-rail current of each substation are sent to each substation. A step of periodically acquiring and storing time series information together with time information as voltage and transmission current;
Extracting the transmission voltage and the transmission current included in a predetermined time width from the transmission voltage and the transmission current of each substation stored corresponding to the time information when a failure occurs; and
Performing an averaging process on the transmission voltage and the transmission current of each extracted substation;
The transmission voltage and the transmission current of each substation subjected to the averaging process

Lx: Distance from one substation to the failure point L: Distance between substations E'a: Sending voltage of one substation ( voltage between substation bus and rail)
E'b: Sending voltage of the other substation ( voltage between substation bus and rail)
ia: Sending current (failure current) of one substation
ib: Sending current (fault current) of the other substation
l: Line inductance per unit length (km) la: Internal inductance of one substation lb: Calculation in the internal inductance of the other substation, and determining a fault point Fault location method.

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