JP4221161B2 - Failure location system, accident removal / failure location system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fault location device for a transmission line and an accident removal / fault location system.
[0002]
[Prior art]
The fault location device (FL: FAULT LOCATOR) of the power system including the transmission line detects the failure (accident) of the transmission line, takes in the voltage and current data at the time of the accident, and preliminarily sets the impedance of the transmission line This is a device that uses to find the distance to the failure point (accident point).
The configuration of a conventional failure point locating device and its time chart are shown in FIGS. The failure point locating device 1 includes a distance locating activation confirmation timer 10, a distance locating activation point determining unit 11, an averaged locating processing unit 12, a locating output unit 13, and a buffer memory 17. The buffer memory 17 takes in and stores the voltage V and current I during the period including the accident period as data in time series as an accident occurs. The accident removal device 2 is a device related to accident removal, and includes, for example, an accident removal relay 20 and a circuit breaker (CB) opening operation unit 21.
When an accident occurs, the accident elimination relay 20 is activated, and the circuit breaker connected to the accident point is opened by the operation unit 21 so as to be disconnected from the accident system. This is the function of the accident removal apparatus 2.
[0003]
On the other hand, in the orientation apparatus 1, the distance orientation activation confirmation timer 10 is activated by the action of the accident removal relay 20, and the determination unit 11 is operated. The determination unit 11 determines a starting point that determines from which point (point) the system bus voltage V and the line current I, which are data for orientation, are used for calculation. Furthermore, the activation determination unit 11 reads out the data V and I obtained during a predetermined period of about 1.5 to 2 cycles from the starting point from the buffer memory 17 and sends them to the averaging / location processing unit 12. The averaging / location processing unit 12 corrects the variation in numerical values by averaging, and then uses this result to calculate the distance to the failure point and outputs this as a standard value at the output unit 13.
[0004]
FIG. 4 shows a waveform and a time chart during such operation. The system bus voltage V and the line current I are input data from the system that leads to the fault point, and when the accident occurs, for example, a phenomenon in which the voltage V decreases and the current I increases appears. When the accident removal relay 20 senses this phenomenon, it is determined that an accident has occurred, the associated circuit breaker is opened via the operation unit 21, and the accident is removed. In FIG. 3, the accident occurrence time is A, and it is shown that the voltage V decreases and the current I increases after this time A, and that the accident is removed at time B. An example is shown in which the current I is zero after time B due to accident removal.
In FIG. 4, the relay 20 waits for an operation time width from the time A until the relay 20 itself operates (for example, processing time until confirmation in the case of software processing) τ _1, and then starts operation (ON). enter. This ON state changes (returns) to the OFF state at time M immediately after the accident removal by the operation unit 21 is completed.
[0005]
Here, a period τ ₃ connecting the times C and D shown in FIG. 3 is a period used as orientation data. That is, the time C when the time widths τ ₁ and τ ₂ have elapsed from the accident occurrence time A becomes the standardization start point (point), and the time D about 1.5 cycles or two cycles after this time is the standardization end point. . Here, the time width τ ₂ is a transient time until the timer 10 operates (ON).
For the period τ ₃ connecting the times C and D, the determination unit 11 accesses the buffer memory 17 to read V and I sampling values one after another, and the averaging / location processing unit 12 performs an averaging process and an orientation calculation. The orientation output unit 13 performs the output.
[0006]
[Problems to be solved by the invention]
The fault location requires that the voltage V and current I are stable as data indicating an accident, respectively. Immediately after the accident (for example, during the period τ ₁ from time A), both the voltage V and current I have amplitudes, Both phases are unstable and lack reliability as data for orientation calculation. Due to the presence of the period τ ₂ , a more stable voltage V and current I can be obtained.
However, there are the following problems. Since the operating time widths τ ₁ and τ ₂ are unique values of the relay 20 and the timer 10 and the accident occurrence time A is determined, the elapsed time C between τ ₂ and τ ₃ is also uniquely determined. is there. However, depending on the type and content of the accident, there were cases where the voltage V and current I were not yet stable at time C, and there was a problem that the calculated standard values were not reliable.
[0007]
On the other hand, recently, the failure duration has become shorter, and a DC component (a transient phenomenon caused by a line campus or inductance) when a failure occurs as shown in FIG. Therefore, depending on how the starting point is determined, the standard sugar content may be adversely affected.
[0008]
The purpose of the present invention is not to determine the starting point from the occurrence of an accident, but to be able to set the starting point for orientation calculation by calculating backward from the time of accident removal, and to improve the reliability of the calculated orientation value A point location system and an accident removal / failure location system are provided.
[0009]
[Means for Solving the Problems]
The present invention, the voltage of orientation for the section chosen from the interval to failure removed from failure of the system, as well as locating the fault point occurrence position based on the current, the origin point of the Jo Shimegi for intervals, fault point Disclosed is a failure point rating device that is determined based on removal or a time in the vicinity thereof.
[0010]
Furthermore the present invention, the Jo Shimegi for intervals discloses a fault point locating apparatus with a predetermined time width from the starting point point.
[0011]
Furthermore, the present invention discloses a failure point locating device in which the starting point is determined based on the output of the undervoltage relay.
[0012]
Furthermore, the present invention provides an accident removal device that detects the occurrence of a fault in the system and disconnects the location from the system, and incorporates the voltage and current in the section for orientation selected from the section from the occurrence of the fault to the removal of the fault. In an accident removal / fault point locating system equipped with a fault locator that locates points,
The accident removal device comprises an accident removal relay that operates upon detecting the occurrence of an accident, and an operation unit that operates the disconnecting means such as a related circuit breaker based on the accident removal relay to remove the failure,
The fault location device includes an undervoltage detection relay that detects and turns on a voltage drop due to a failure, a buffer memory that captures and stores sampling voltage and current data from the time of the failure to at least the time of failure removal, and an undervoltage detection relay Means for determining the starting point of the above-mentioned orientation section from the time when the system failure is turned ON to the time of failure removal, and setting the predetermined period as the orientation section from this starting point, and this setting Means for reading the voltage and current data of the section for standardization from the buffer memory, means for standardizing the failure point based on the read voltage and current data, and means for outputting the standardization result,
An accident removal / fault location system is disclosed.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a diagram showing an embodiment of a fault location apparatus 1 according to the present invention, and FIG. 2 is a waveform diagram and a time chart. The failure point locating device 1 includes an undervoltage relay 15, a capture period setting unit 16, a buffer memory 17, an averaging processing unit 12, and a grading output unit 13. The undervoltage relay 15 is uniquely installed in the failure point locating device 1 and is used for other function processing. In the present embodiment, the undervoltage relay 15 is used as a substitute for the output of the accident elimination relay 21. Further, the capture period setting unit 16 receives the operation signal (ON / OFF) of the undervoltage relay 15 to automatically set a capture period of data V and I described later, and performs selective reading from the memory 17.
[0014]
The undervoltage relay 15 detects a drop in the system bus voltage V, and operates (ON) when the bus voltage V becomes a voltage equal to or lower than a predetermined threshold. The undervoltage relay 15 requires a transition time until it operates, and this is an operation time width τ ₄ . It is determined that the voltage is insufficient when the time width τ ₄ has elapsed. The undervoltage relay 15 returns (OFF) when the voltage V becomes equal to or higher than the predetermined threshold. The time when the voltage V becomes equal to or higher than a predetermined threshold is when the accident elimination relay 21 is turned on, the opening operation unit 22 is activated, and the related circuit breaker (CB) is opened. As a result, the voltage V increases.
[0015]
However, even if the voltage V becomes a value equal to or higher than the undervoltage due to the operation of the operation unit 22, the undervoltage relay 15 does not immediately return, but returns after a predetermined transient time. This is the operating time width τ ₅ .
[0016]
Therefore, in the present embodiment, when the undervoltage relay 15 returns (OFF), the time F that is an operation time width τ ₅ before the return time E is set as the reference time, and further before this time F. A time G having a predetermined time width (for example, about 1.5 cycles or 2 cycles) was obtained, and a period from time G to F was taken as a period for taking in the voltage V and current I for orientation. That is, the time G becomes the starting point, and the voltage V and the current I captured during the time G to F on the buffer memory 17 are used as the input data for the orientation calculation. The capture period setting unit 16 automatically determines the periods G to F.
[0017]
Here, the voltage V and the current I are successively taken into the fault location device 1 by sampling, are AD-converted, and are temporarily stored in the buffer memory 17 in time series. In the present embodiment, the period setting unit 10 selectively reads out the V and I data from the times G to F from the V and I data already stored in the buffer memory 17, and the averaging / location processing unit 12. To calculate the failure point. This failure point is output from the orientation output unit 13.
[0018]
The above time chart and waveform are shown in FIG. The progress of the system bus voltage V and the line current I is the same as in the example of FIG. That is, the point A is the accident occurrence time, and the point B is the associated circuit breaker (CB) opening time (accident removal time) by the operation unit 22. Then, an orientation input taking-in period is selected from the sections A to B. The selection differs from FIG. 4 in that it is based on the operation signal (ON / OFF) of the undervoltage relay 15.
[0019]
The undervoltage relay 15 is determined to be equal to or less than the threshold at time H after the operation time width τ ₄ from time A, and is turned from OFF to ON. This ON period is a period in which the voltage V is less than or equal to this threshold, and is after the time width τ ₅ from the accident removal time B. Therefore, a time F that is a time width τ ₅ before the time E when the undervoltage relay 15 is changed from ON to OFF (actually, that time from the time B in order to eliminate the influence of the transient phenomenon of the removal process). The time Δτ slightly before is good, so the width between the FEs is set to τ ₅ + Δτ), and the time G before the predetermined time (for example, about 1.5 to 2 cycles) is set. . Then, the period from time G to F is set as the data input period for orientation. The setting unit 16 sets these times and periods.
[0020]
On the other hand, FIG. 6 shows an example in the present embodiment in which the influence of the direct current component compared with FIG. 5 is eliminated. It can be seen that the influence of the DC component can be reduced because the period GH is set ahead of time based on the return of the relay 15 after the accident is removed. Of course, if the DC component is zero before time G, there will be no effect.
[0021]
In the embodiment shown in FIG. 1, the elements 21 and 15 are shown as hardware examples, but it goes without saying that these elements can be replaced by digital processing by software. Further, the section of the data stored in the buffer memory 17 is sufficiently set in the section from the accident occurrence time A to the return time E. However, in order to make sure, the example is set over a relatively large period including the predetermined period after the return time E. It is possible. Further, although the undervoltage relay 15 is also provided inside the device 1, an example of newly installing it is included. Furthermore, it is natural that the averaging and orientation processing unit 12 includes various orientation calculation methods. Furthermore, although the input data to the buffer memory 17 is also two, V and I, there may naturally be other examples including measurement data that seems to be necessary for orientation.
[0022]
【The invention's effect】
According to the present invention, it is possible to perform reliable orientation that is adversely affected by tidal currents and the like in various aspects of accidents at the calculation start timing of the failure point location device. Further, it is possible to cope with a high failure duration and to make the start timing common.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of a fault location apparatus according to the present invention.
FIG. 2 is a waveform diagram and a time chart thereof.
FIG. 3 is a diagram showing a conventional example.
FIG. 4 is a waveform diagram and a time chart in a conventional example.
FIG. 5 is a diagram illustrating the influence of a direct current component in a conventional example.
FIG. 6 is a diagram showing removal of the influence of a direct current component in the present embodiment.
[Explanation of symbols]
V System bus voltage I Line current 1 Fault location device 2 Accident elimination device 12 Averaging and location processing unit 13 Location output unit 15 Undervoltage relay 16 Acquisition period setting unit 17 Buffer memory

Claims (4)

Voltage-localization section chosen from the interval to failure removed from failure of the system, as well as locating the fault point occurrence position based on the current, the target origin point of the constant for intervals, failure points removed or near the Failure point rating device that is determined based on time. The Jo Shimegi for intervals, predetermined time width claims 1 fault point locating system from the starting point.   The failure point locating apparatus according to claim 1, wherein the starting point is determined based on an output of an undervoltage relay. A fault eliminator that detects the occurrence of a fault in the system and disconnects the location from the grid, and a fault that locates the fault point by taking in the voltage and current in the section for orientation selected from the section from the occurrence of the fault to the removal of the accident In the accident removal / fault location system equipped with a point location device,
The accident removal device includes an accident removal relay that operates upon detection of an accident occurrence, and an operation unit that operates the disconnecting means such as a related circuit breaker based on the accident removal relay to remove the failure,
The fault location device includes an undervoltage detection relay that detects and turns on a voltage drop due to a failure, a buffer memory that captures and stores sampling voltage and current data from the time of the failure to at least the time of failure removal, and an undervoltage detection relay Means for determining the starting point of the above-mentioned orientation section from the time when the system failure is turned ON to the time of failure removal, and setting the predetermined period as the orientation section from this starting point, and this setting Means for reading the voltage and current data of the section for standardization from the buffer memory, means for standardizing the failure point based on the read voltage and current data, and means for outputting the standardization result,
Accident removal / fault location system characterized by

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