JP4733987B2 - FAILURE LOCATION METHOD, DEVICE, PROGRAM, AND COMPUTER-READABLE RECORDING MEDIUM - Google Patents

Description

  The present invention relates to a failure point locating method and apparatus suitable for locating a short-circuit failure point between T phase and F phase in a parallel feeding section, a program used therefor, and a recording medium on which the program is recorded. is there.

Conventionally, as a fault location method in a parallel feeder section, a current proportional method using the fact that the current values of two SSs (substations / substations) that are parallel power supplies are inversely proportional to the distance to the fault point, There is a reactance method in which reactance from a line voltage / current to a failure point is calculated and converted into a distance. However, these methods have a problem that an error occurs in the orientation value due to the following reasons.
-Error due to cross current: In a parallel feed section where the same power section power is sent from two opposing substations, a cross current flows between the substations. If the short-circuit resistance at the failure point is 0Ω at the time of short-circuit failure in the feeder circuit, no cross current flows through the fault line, but there is a short-circuit resistance and a voltage difference (vector-like) exists between the substation voltages. In some cases, cross current flows through the fault line. Since the fault line current in this case includes cross current, the fault line currents of the two substations are not inversely proportional to the distance to the fault point, and an error occurs in the current proportional method.

-Error due to short-circuit resistance: When a short-circuit fault occurs in the parallel feeding section, the current flowing to the fault point is supplied from both substations. If there is a short-circuit resistance and there is a phase difference between the currents supplied from both substations, a part of the voltage generated by the short-circuit resistance appears to be a voltage generated by the reactance component even though it is a voltage due to the resistance. . This causes an error in the reactance locating method.
-Error due to power source impedance: In the current ratio method, the current ratio is determined by the total impedance including the impedance on the power source side in addition to the line impedance proportional to the distance from the substation to the failure point. Therefore, in the case of the parallel feeding section, it is necessary to correct the error caused by the difference between the power source impedances of the two substations.

In addition, there is an AT wicking current ratio method that is generally adopted as a failure point location method for parallel feeder sections in Shinkansen and the like, but in principle it cannot be determined for short-circuit faults between T and F phases. Met.
In addition, as a fault location method in the feeder section, it is determined that a short-circuit fault has occurred between the feeder line and the trolley wire in the section by the fact that the direction of the feeder current is reversed at both posts sandwiching the fault section. A method has been proposed (see, for example, Patent Document 1). However, this method cannot be determined for a short-circuit fault between the T phase and the F phase in the parallel feeding section.
JP 2003-72431 A

  Accordingly, an object of the present invention is to solve the above-described problems and to realize a fault location method and apparatus capable of accurately and stably locating a short-circuit fault point between the T phase and the F phase in a parallel feeding section.

  The fault location method according to the present invention is generated in the second line of the parallel feeding section in which the first power source is connected to one end of the first line and the second line and the second power source is connected to the other end. A short-circuit fault location method for locating the short-circuit fault point, wherein the current value flowing from the first power source to the first line when the short-circuit fault occurs is I1, and the current value flowing from the second power source is I2. When the current value flowing from the first power source into the second line is I3, the current value flowing from the second power source is I4, and the lengths of the first and second lines are D, the first The distance X from the power source to the short-circuit fault point is obtained by X = D · | (I4 + I1) / (I4 + I2) |.

により、前記距離Ｘを求めることを特徴としている。 According to the present invention, in the fault location method according to claim 1, the current value is a vector value.
According to a second aspect of the present invention, in the failure point locating method according to the second aspect, the phase reference is unified with the voltage of the first or second power source.
Further, the present invention is the failure point locating method according to claim 1, wherein the current value is an instantaneous value.
Further, the present invention includes not only the instantaneous value of the current value but also the rate of change of the instantaneous value,

Thus, the distance X is obtained.

According to a fourth aspect of the present invention, in the failure point locating method according to the fourth aspect, the measurement of the current value synchronizes the measurement time in the first and second power supplies.
Further, the present invention provides the fault location method according to any one of claims 1 to 5, wherein the first line is an uplink or a downlink, and the second line is a downlink or an uplink. It is characterized by being.
Further, the present invention provides the fault location method according to any one of claims 1 to 6, wherein the first and second lines are trolley wires or feeders in the parallel feeder section. It is said.

The fault location apparatus according to the present invention also includes a second line in a parallel feeding section in which a first power source is connected to one end of the first line and the second line, and a second power source is connected to the other end. A short-circuit fault locating device for locating a short-circuit fault point occurring in the circuit, wherein when the short-circuit fault occurs, a current value I1 flowing from the first power source into the first line and a current value I2 flowing from the second power source, Measuring means for measuring a current value I3 flowing from the first power source into the second line and a current value I4 flowing from the second power source;
And calculating means for obtaining the distance X from the first power source to the short-circuit fault point by X = D · | (I 4 + I 1) / (I 4 + I 2) |, where D is the length of each of the first and second lines. It is characterized by having.

In addition, the program according to the present invention is generated in the second line of the parallel feeding section in which the first power source is connected to one end of the first line and the second line and the second power source is connected to the other end. In the program for locating the short-circuit fault point, when a short-circuit fault occurs, the current value I1 flowing from the first power supply to the first line and the current value I2 flowing from the second power supply to the first line, and the first power supply to the second line From the first power supply to the short-circuit fault point, where D is the length of the first and second lines, respectively, and the measurement process for measuring the current value I3 flowing in from the power supply I3 and the current value I4 flowing in from the second power supply. Is calculated by X = D · | (I4 + I1) / (I4 + I2) |.
A computer-readable recording medium according to the present invention records the program.

  The present invention includes a case where either one of the first power supply and the second power supply does not exist.

  According to the present invention, the short-circuit fault point between the T phase and the F phase in the parallel feeding section can be accurately and stably determined without being affected by the cross current, the short circuit resistance, the power source impedance, and the like.

Embodiments of the present invention will be described below with reference to the drawings.
<First Embodiment>
FIG. 1 is a block diagram showing a fault location apparatus in a parallel feeding section according to the first embodiment of the present invention.
In FIG. 1, one end of the trolley wire T, rail R, and feeder F is commonly connected to the power source 1A of the A substation, and the other end of each wire is commonly connected to the power source 1B of the B substation. Each line is connected to a plurality of autotransformers 2 as shown in the figure, and power is supplied from two power sources 1A and 1B to form a parallel feeder circuit. In the present embodiment, a short circuit failure between the electric wires F (T phase and F phase) when the trolley wire T is used is determined.

  The slave station 3A measures the voltage and current on the power supply 1A side. The slave station 3B measures the voltage and current on the power supply 1B side. Each of the slave stations 3A and 3B includes an A / D conversion unit, an accident detection unit, and a waveform recording unit. The accident detection unit detects the occurrence of a failure by detecting a short-circuit detection signal from a protection relay (not shown) when a short-circuit failure occurs. The waveform recording unit measures and records the voltage / current waveform at the time of failure. The A / D conversion unit converts the analog signal such as the detection signal and the recording waveform into digital data and transmits the digital data to the master station 4. Further, the slave station 3A and the slave station 3B are configured to obtain time information from the GPS system and synchronize. The master station 4 includes a central device that performs a calculation for locating a failure point from the recorded waveform based on data from the slave stations 3A and 3B.

FIG. 2 is a block diagram of the parallel feeder circuit.
In FIG. 2, an upstream line 5 and a downstream line 6 are supplied with power by connecting both ends to a power source 1A and a power source 1B, respectively. In the figure, the up line 5 and the down line 6 show only a one-phase line, but actually each has a three-phase line. The illustrated line is, for example, a trolley line T, and there is another feeder line F having the same configuration.
On the A substation side, the 14-line current I14 on the upstream line 5 and the 13-line current I13 on the downstream line 6 are measured by the instrument current transformer CT, and the voltage V13 on the 13 line is measured by the instrument transformer PT. Measuring. On the B substation side, the 12-line current I12 on the upstream line 5 and the 11-line current I11 on the downstream line 6 are measured by the instrument current transformer CT, and the voltage V14 on the 14 line is measured by the instrument transformer. It is measured by PT. In the claims, I1 = I14, I2 = I12, I3 = I13, and I4 = I11.

FIG. 3 is an equivalent circuit diagram of FIG. 2 at the time of a T-phase-F-phase short-circuit fault for explaining the principle of the fault location method using the line current location method of the present embodiment.
In FIG. 3, the power source 1 </ b> A supplies a current I <b> 14 to the upstream line 5 and supplies I <b> 13 to the downstream line 6. The power supply 1B supplies the current I12 to the upstream line 5 and supplies I11 to the downstream line 6. The power supplies 1A and 1B have power supply impedances 7A and 7B, respectively, and the upstream line 5 has a line impedance 8. The down line 6 has line impedances 9 and 10 on both sides of the short-circuit fault point, and a short-circuit resistance 11 between the short-circuit fault point.

In the above configuration, assuming that the total length of the upstream line 5 and the downstream line 6 is D (km) and the short-circuit fault point is at a distance of X (km) from the line connection point of the A substation, X is the following fault location It can obtain | require by Formula (1).
X = D · | (I11 + I14) / (I11 + I13) |
Or X = D · | (I11−I12) / (I11 + I13) | (∵I14 = −I12) (1)
This method according to the present embodiment is called a line current orientation method.

  Current values to be substituted into the failure point locating formula (1) include a method using I11, I12, I13, and I14 as vector values and a method using instantaneous values. In the case of the vector value method, since it is necessary to determine the reference phase, it is necessary to record the phase difference between the voltage and each line current at the substations 3A and 3B of the A substation and the B substation. Further, a process for unifying the phase reference to the voltage phase of the power source 1A or the power source 1B is necessary. In the case of the instantaneous value method, accurate synchronous measurement between the A substation and the B substation is required. In that case, the time accuracy required for synchronization is considered to be about 50 μs. In reality, a signal at the time of failure is obtained from the protective relay, but a waveform of about 3 waves can be obtained in 50 to 100 ms in which the short-circuit failure state until then is continued, and orientation is performed from this.

The values to be measured at the substations A and B in the vector value method and the instantaneous value method, that is, the input elements necessary for fault location are shown in the following table.
Input element Vector value method Instantaneous value method
Feeding voltage V13 or V14 ○ ×
・ A substation feed current I13 ○ ○
Feeding current I14 ○ ○
Feeding voltage V11 or V12 ○ ×
・ B substation feed current I11 ○ ○
Feeding current I12 ○ ○
As can be seen from this table, the voltage value does not need to be input in the case of the instantaneous value method.

The standard formula (1) is a case where a short circuit failure occurs in the down line 6 (11 lines, 13 lines). However, when a short circuit failure occurs in the up line 5, I13 is set to I14, and I11 is set to I12. It can be calculated by replacing. Therefore, it is necessary to determine the faulty line. There are the following two methods as the determination method.
(1) A line with the largest current is set as a faulty line.
(2) A line in which the vector sum of currents of the A substation and the B substation is 0 (A) is defined as a faulty line.

  Next, the fault location calculation procedure by the vector value method and the instantaneous value method will be described. In each system, the procedure is started with a short circuit fault detection signal from the protection relay as a trigger. The failure point locating device itself can detect a failure, and the following procedure can be started by using the failure detection by the failure point locating device as a trigger.

-Calculation procedure by vector value method Fig. 4 shows a schematic diagram of a circuit at the time of a short-circuit fault. Here, V13 is indicated by VA and V11 is indicated by VB. Also, let Z be the value of the line impedance 8 of the upstream line 5.

1. In FIG. 4, the slave station 3A and the slave station 3B take in a voltage / current waveform and obtain a vector value of the voltage / current. The obtained vector is shown in FIG.
2. The voltage / current vector values of each line are transmitted from the slave stations 3A and 3B to the master station 4. FIG. 6 shows the voltage phase difference between the A substation and the B substation.
3. The central device of the master station 4 multiplies the known line impedance between the A substation and the B substation by the current I14 (or I12) of the healthy line, and the A substation voltage VA and the B substation from the vector relationship of FIG. A phase difference angle θAB between the voltages VB is obtained.
4). Corrected by the above-mentioned θAB, the phase angle of I11 is made the standard of A substation voltage VA (V13) as shown in FIG.
5. The failure point orientation value X is calculated by substituting I11, I13, and I14 in the vector diagram of FIG. 7 into the failure location formula (1).

・ Calculation procedure using the instantaneous value method The slave stations 3A and 3B that are time-synchronized record waveforms. The recording sampling frequency is about 20 kHz or more, and the time synchronization error is about 50 μsec or less.
2. The recorded instantaneous current data of each line is transmitted to the master station 4 for about 2 to 3 wavelengths.
3. The central device of the master station 4 calculates the orientation value by substituting the instantaneous value current data into the failure point orientation equation (1).
4). The orientation value near the peak value of the current waveform having the largest value among the calculation results is adopted as the failure point orientation value.

FIG. 8 shows a fault location result by the instantaneous value method.
As the current shown in FIG. 6A approaches 0, the error of the orientation value increases as shown in FIG. 5B, and the orientation is impossible at 0 point. However, as indicated by the dotted line in FIG. 8, the orientation value at the instantaneous value in the vicinity of the fault line current peak value is stable, and practically sufficient accuracy can be obtained.
As described above, according to the present embodiment, the short-circuit fault point between the T phase and the F phase in the parallel feeding section is accurately and stably determined without being affected by the cross current, the short circuit resistance, the power source impedance, and the like. be able to.

<Second Embodiment>
Next, the principle of the short-circuit fault location locating method according to the line current locating method of the second embodiment will be described with reference to FIG. FIG. 9 is an equivalent circuit of FIG. 2 at the time of a T-phase-F-phase short-circuit fault similar to FIG. 3, for explaining the principle of the line current locating method of the second embodiment of the present invention.
In the instantaneous value method, the current of each line is the same as that described in FIGS. 1, 2 and 3, but in the second embodiment shown in FIG. 9, the line impedance 8 and the line impedance 9 , Current values I14, I12, I13, and I11 flowing through the line 14, line 12, line 13, and line 11, respectively, due to the line impedance 10, as well as currents caused by the line reactance L8, line reactance L9, and line reactance L10 of each line Considering the rate of change (differential value) of the instantaneous value, the differential equation shown in the following equation (2) is obtained.

In the above equation (2), as shown in the figure, as in FIG. 3, the distance between the slave station 3A and the slave station 3B is D, and from the substation at the failure point C where the TF short-circuit occurred. Is X. In addition, the resistance component of the impedance per unit (for example, km) of the line connecting each line is R (Ω / km), and similarly, the reactance component per unit (for example, km) is L (H / km). ).
Since there is no short circuit between the 14th line and the 12th line, the current value I14 and the current value I12 are determined by the resistance value D · R (Ω) of the line impedance 8, and the current value I14 and the current value I12 change. The rate is determined by the reactance D · L (H) of the line reactance L8.

In addition, since a TF short-circuit failure occurs at the failure point C between the 13th line and the 11th line, the line impedance and the line reactance between the lines connecting the 13th line and the 11th line are divided.
The line impedance is divided into a line impedance 9 (resistance value X · R (Ω)) on the line 13 side and a line impedance 10 (resistance value (D−X) · R (Ω)) on the line 11 side. The line reactance L9 (reactance X · L (H)) on the line 13 side and the line reactance L10 (reactance (D−X) · L (H)) on the line 11 side are divided.

In equation (2), the rate of change of the instantaneous value of the current i14 flowing through the line reactance L8 is “di14 / dt”, and the rate of change of the instantaneous value of the current i13 flowing through the line reactance L9 is “di13 / dt”. Yes, the rate of change of the instantaneous value of the current i11 flowing through the line reactance L10 is “di11 / dt”.
When the differential equation of (2) is arranged to obtain the distance X, the following expression (3) is obtained.

Using the standardization formula (3) above, the fault point is standardized using the instantaneous current value as follows.
・ Calculation procedure by the instantaneous value method using the standard formula (3) The slave stations 3A and 3B that are time-synchronized record waveforms. The recording sampling frequency is about 20 kHz or more, and the time synchronization error is about 50 μsec or less.
2. The recorded instantaneous current data of each line is transmitted to the master station 4 for about 2 to 3 wavelengths.
3. The central unit of the master station 4 calculates the orientation value by substituting the instantaneous value current data and the rate of change (differential value) into the failure point orientation equation (3).
4). The orientation value near the peak value of the current waveform having the largest value among the calculation results is adopted as the failure point orientation value.

As described above, the failure point locating method according to the second embodiment has the same configuration as that of the instantaneous value method in the first embodiment already described, and the concept of other locating methods. However, the difference from the first embodiment is that the equation (3) is configured by adding the change rate of the instantaneous value of the current in each line as a parameter to the equation (1).
Then, by substituting the instantaneous value of the current of the four lines (lines 11, 12, 13, and 14) sandwiching the failure point and the rate of change thereof into the equation (3) at an arbitrary time when the failure occurs, The position (distance from the slave station 3A in the second embodiment) can be determined.

Further, in addition to the effects of the first embodiment, the fault location method according to the second embodiment has a sine wave orientation method using vector values as compared to the vector value method using equation (1). While it is possible to deal only with the fault current, the orientation formula based on the instantaneous value of the equation (3) is the solution of the differential equation of the instantaneous value, so that it is hardly affected by the waveform distortion in principle.
In addition, a transient DC component may be superimposed on the actual fault current. When the DC component is superimposed, the fault location method according to the second embodiment is more in comparison with the first embodiment. The accuracy in locating a failure point (for example, a TF short-circuit point) can be increased.

Furthermore, in the parallel feeder section shown in FIG. 2, the feeder circuit breakers at both substations (A, B) across the failure point are opened, but there is a time difference in the opening time. When the circuit breaker is opened, the fault current changes due to the change in the fault circuit.
As a result, it is desirable to use current waveform data immediately after the occurrence of a failure (after 20 to 30 milliseconds) in fault location, but in the case of orientation using a vector value, there is an error in the fault location to be determined due to the influence of a transient phenomenon. May occur.
However, according to the second embodiment, since the orientation value based on the instantaneous value of equation (3) is also effective for waveform distortion due to a transient phenomenon, even with the waveform instantaneous value immediately after the failure, with high accuracy, Fault location can be performed.

Next, a program according to the first and second embodiments of the present invention and a recording medium for recording the program will be described.
A program for the CPU of the computer system in the fault location apparatus according to the present invention to execute processing based on the above-described operation of the present embodiment constitutes a program according to the present invention.

The recording medium for recording the program constitutes a computer-readable recording medium according to the present invention. As this recording medium, a magneto-optical disk, an optical disk, a semiconductor memory, a magnetic recording medium, or the like can be used, and these may be configured and used in a ROM, RAM, CD-ROM, flexible disk, memory card, or the like.
In addition, this recording medium can store a program for a certain period of time such as a volatile memory such as a RAM in a computer system as a server or a client when the program is transmitted via a network such as the Internet or a communication line such as a telephone line. The thing to hold is also included.

The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. The transmission medium is a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.
The program may be for realizing part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, what is called a difference file (difference program) may be sufficient.

  Therefore, even when this program and recording medium are used in a system or apparatus different from the system or apparatus in FIG. 1 and the computer of the system or apparatus executes this program, the functions and effects described in the embodiment are equivalent. Functions and effects can be obtained, and the problems of the present invention can be solved.

It is a block diagram which shows the failure point location apparatus by embodiment of this invention. It is a block diagram which shows the parallel feeder circuit of a failure point location apparatus. It is a block diagram which shows the equivalent circuit of the parallel feeder circuit at the time of the short circuit fault for demonstrating the principle of the fault location method in the 1st Embodiment of this invention. 1 is a schematic diagram of a circuit at the time of a short-circuit fault. It is a vector diagram at the time of a short circuit failure. It is a vector diagram which shows the phase difference of the voltage of A substation and B substation. It is a vector diagram on the basis of the voltage of A substation. It is a graph which shows an example of the orientation result by an instantaneous value system. It is a block diagram which shows the equivalent circuit of the parallel feeder circuit at the time of the short circuit fault for demonstrating the principle of the fault location method in the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1A, 1B ... Power supply 3A, 3B ... Slave station 4 ... Master station 5 ... Up line 6 ... Down line 7A, 7B ... Power supply impedance 8, 9, 10 ... Line impedance 11 ... Short-circuit resistance L8, L9, L10 ... Line reactance

Claims (12)

A short-circuit fault for locating a short-circuit fault occurring in the second line of the parallel feeding section in which the first power source is connected to one end of the first line and the second line and the second power source is connected to the other end A point location method,
When a short-circuit fault occurs, the current value flowing from the first power source to the first line is I 14 , the current value flowing from the second power source is I 12, and the current flowing from the first power source to the second line When the value is I 13 , the current value flowing from the second power source is I 11, and the lengths of the first and second lines are D, the current values I 11, I 12, I 13 and I 14 are vector values. There, these current values I11, I12, I13 and the phase of the phase reference I14 unified to the first or second voltage supply, the distance X to the short circuit fault point from the first power supply,
X = D · | (I 11 + I 14 ) / (I 11 + I 13 ) |
The fault location method characterized by calculating | requiring by. A short-circuit fault for locating a short-circuit fault occurring in the second line of the parallel feeding section in which the first power source is connected to one end of the first line and the second line and the second power source is connected to the other end A point location method,
When a short-circuit failure occurs, the current value flowing from the first power source to the first line is I14, the current value flowing from the second power source is I12, and the current value flowing from the first power source to the second line is I13, where the current value flowing from the second power source is I11 and the lengths of the first and second lines are D, respectively, the current values I11, I12, I13 and I14 are instantaneous values measured synchronously. Yes, according to the peak value of the current waveform of each current value, the distance X from the first power source to the short-circuit fault point is
X = D · | (I11 + I14) / (I11 + I13) |
The fault location method characterized by calculating | requiring by. A short-circuit fault for locating a short-circuit fault occurring in the second line of the parallel feeding section in which the first power source is connected to one end of the first line and the second line and the second power source is connected to the other end A point location method,
When a short-circuit failure occurs, the current value flowing from the first power source to the first line is I14, the current value flowing from the second power source is I12, and the current value flowing from the first power source to the second line is I13, the current value flowing from the second power source is I11, the lengths of the first and second lines are D, the resistance values per unit length of the first and second lines are R, the first The reactance per unit length of the second line is L, and the rate of change of each of the current values I11, I13 and I14, which are instantaneous values measured synchronously, is di11 / dt, di13 / dt, di14 / dt. And using the peak value of the current waveform of each current value, the distance X from the first power source to the short-circuit fault point is

Failure point evaluation method characterized by being obtained by 4. The fault location method according to claim 1, wherein the first line is an up line or a down line, and the second line is a down line or an up line. 5. . The fault location method according to any one of claims 1 to 4, wherein the first and second lines are trolley wires or feeders in the parallel feeder section. A short-circuit fault for locating a short-circuit fault occurring in the second line of the parallel feeding section in which the first power source is connected to one end of the first line and the second line and the second power source is connected to the other end A point locator,
When a short-circuit fault occurs, the current value flowing from the first power source to the first line is I 14 , the current value flowing from the second power source is I 12, and the current flowing from the first power source to the second line Measuring means for measuring the value I 13 and the current value flowing from the second power source I 11 ;
When the lengths of the first and second lines are respectively D, the current values I11, I12, I13 and I14 are vector values, and the phase reference of the phases of these current values I11, I12, I13 and I14 is set as the vector value. unified to the first or second voltage supply, the distance X to the short circuit fault point from the first power supply,
X = D · | (I 11 + I 14 ) / (I 11 + I 13 ) |
A failure point locating device, comprising: an arithmetic means for obtaining the above. A short-circuit fault for locating a short-circuit fault occurring in the second line of the parallel feeding section in which the first power source is connected to one end of the first line and the second line and the second power source is connected to the other end A point locator,
When a short-circuit failure occurs, the current value flowing from the first power source to the first line is I14, the current value flowing from the second power source is I12, and the current value flowing from the first power source to the second line is I13, measuring means for measuring the current value flowing from the second power source I11;
When the lengths of the first and second lines are respectively D, the current values I11, I12, I13, and I14 are instantaneous values. From the peak value of the current waveform of each current value, the first power supply The distance X to the short-circuit failure point is
X = D · | (I11 + I14) / (I11 + I13) |
The calculation means obtained by
A failure point locating device characterized by comprising: A short-circuit fault for locating a short-circuit fault occurring in the second line of the parallel feeding section in which the first power source is connected to one end of the first line and the second line and the second power source is connected to the other end A point locator,
When a short-circuit failure occurs, the current value flowing from the first power source to the first line is I14, the current value flowing from the second power source is I12, and the current value flowing from the first power source to the second line is I13, measuring means for measuring the current value flowing from the second power source I11;
The length of the first and second lines is D, the resistance value per unit length of the first and second lines is R, respectively, and the reactance per unit length of the first and second lines is respectively L, the change rates of the current values I11, I13, and I14, which are instantaneous values, are obtained as di11 / dt, di13 / dt, and di14 / dt, and the peak value of the current waveform of each current value is used to calculate the first value. The distance X from the power supply to the short-circuit failure point is

The calculation means obtained by
A failure point locating device comprising: A program for locating a short-circuit failure point occurring in the second line of the parallel feeding section in which the first power source is connected to one end of the first line and the second line and the second power source is connected to the other end. There,
When a short-circuit fault occurs, the current value flowing from the first power source to the first line is I 14 , the current value flowing from the second power source is I 12, and the current flowing from the first power source to the second line A measurement process for measuring a value I 13 and a current value flowing from the second power source I 11 ;
When the lengths of the first and second lines are respectively D, the current values I11, I12, I13 and I14 are vector values, and the phase reference of the phases of these current values I11, I12, I13 and I14 is set as the vector value. unified to the first or second voltage supply, the distance X to the short circuit fault point from the first power supply,
X = D · | (I 11 + I 14 ) / (I 11 + I 13 ) |
A program that causes a computer to execute the arithmetic processing required by. A program for locating a short-circuit failure point occurring in the second line of the parallel feeding section in which the first power source is connected to one end of the first line and the second line and the second power source is connected to the other end. There,
When a short-circuit failure occurs, the current value flowing from the first power source to the first line is I14, the current value flowing from the second power source is I12, and the current value flowing from the first power source to the second line is I13, a measurement process for measuring the current value flowing from the second power source I11,
When the lengths of the first and second lines are D, the current values I11, I12, I13, and I14 are instantaneous values. From the peak value of the current waveform to the short-circuit fault point. The distance X of
X = D · | (I11 + I14) / (I11 + I13) |
The calculation processing
A program that causes a computer to execute. A program for locating a short-circuit failure point occurring in the second line of the parallel feeding section in which the first power source is connected to one end of the first line and the second line and the second power source is connected to the other end. There,
When a short-circuit failure occurs, the current value flowing from the first power source to the first line is I14, the current value flowing from the second power source is I12, and the current value flowing from the first power source to the second line is I13, a measurement process for measuring the current value flowing from the second power source I11,
The length of the first and second lines is D, the resistance value per unit length of the first and second lines is R, respectively, and the reactance per unit length of the first and second lines is respectively L, the change rates of the current values I11, I13, and I14, which are instantaneous values, are obtained as di11 / dt, di13 / dt, and di14 / dt, and the peak value of the current waveform of each current value is used to calculate the first value. The distance X from the power supply to the short-circuit failure point is

The calculation processing
A program that causes a computer to execute. The computer-readable recording medium which recorded the program of any one of Claims 9-11.

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