JP5592283B2 - Accident point locator - Google Patents

Description

  The present invention relates to an accident point location device.

  Patent Document 1 discloses a fault locator that is a device for locating an accident point of an accident that has occurred in a transmission line of an electric power station. Patent Document 2 discloses a technique for locating an accident point without using a device such as a fault locator.

Japanese Patent Laid-Open No. 10-54863 JP 2006-126038 A

  By the way, since a measuring device such as a fault locator is generally expensive, it is difficult to provide a measuring device such as a fault locator for all the transmission lines in an electric station. Further, in the technique disclosed in Patent Document 2, for example, a time-characteristic undervoltage relay is used. However, in an electric station where a time-characteristic undervoltage relay is not provided, the technique disclosed in Patent Document 2 is used. Accident points cannot be located using.

  The present invention has been made in view of the above problems, and an object thereof is to provide an accident point locating apparatus capable of locating an accident point without using a special measuring device or a relay.

In order to achieve the above object, according to one aspect of the present invention, first and second power transmission lines provided between the first and second bus bars, and a current flowing from the first bus line to the first power transmission line. And a current flowing from the first bus to the second power transmission line, when a first short circuit or ground fault occurs in the first power transmission line, the first bus and the first power transmission line A first circuit breaker provided between the first bus and the second power transmission line when a second short circuit or ground fault occurs in the second power transmission line. Two first circuit breakers, a current flowing from the second bus to the first power transmission line, and a current flowing from the second bus to the second power transmission line, the first power transmission line When one accident occurs, the third circuit breaker provided between the second bus and the first power transmission line is cut off. A second relay that shuts off a fourth circuit breaker provided between the second bus and the second power transmission line when the second accident occurs in the second power transmission line; A first time measuring device that monitors the state of the first and second circuit breakers and stores the time measured by the first time measuring device when the state of the first and second circuit breakers changes; a monitoring device includes a second time measurement device for measuring time, said third and monitors the state of the fourth circuit breaker, said third and fourth the second timing device when the circuit breaker changes state An accident point locating device at an electric station comprising a second monitoring device that stores a time counted by the first time when the first or second circuit breaker is interrupted is stored in the first monitoring device. A first acquisition unit that acquires the first time stored in the first monitoring device; and Or the second time when the fourth breaker is interrupted is stored in the second monitoring device, a second obtaining unit that obtains the second time stored in the second monitoring device, the first time Based on the determination result of whether or not the second time is earlier than the second time and the determination result of whether or not the difference between the first time and the second time is greater than a predetermined time . And an orientation part for locating the accident point where the accident occurred.

  It is possible to provide an accident point locating device capable of locating an accident point without using a special measuring device or a relay.

It is the figure which showed the electric power grid | system 10 where the accident point location apparatus 80 which is one Embodiment of this invention was used. 2 is a diagram showing a configuration of a telecon 70. FIG. It is a figure for demonstrating the generation | occurrence | production area of the accident point in the power transmission lines 30 and 31. FIG. It is a figure for demonstrating the change of the state of the circuit breakers 40 and 42 when an accident generate | occur | produces in the area X of the power transmission line 30. FIG. It is a figure for demonstrating the change of the state of the circuit breakers 40 and 42 when an accident generate | occur | produces in the area Z of the power transmission line 30. FIG. It is a figure for demonstrating the change of the state of the circuit breakers 40 and 42 when an accident generate | occur | produces in the area Y of the power transmission line 30. FIG. It is a figure which shows the structure of the accident point location apparatus. It is a figure for demonstrating the correction | amendment time when the time of the time measuring device 91 and the time measuring device 96 is not synchronizing. 3 is a flowchart illustrating an example of processing executed by a microcomputer 101. It is a flowchart which shows an example of the process which the correction | amendment part 112 performs. It is an example of SOE data when an accident occurs in a range X.

  At least the following matters will become apparent from the description of this specification and the accompanying drawings.

FIG. 1 is a diagram illustrating a configuration example of an electric power system 10 provided with an accident point locating device 80 according to an embodiment of the present invention.
The electric power system 10 is provided with electric stations A and B, a relay station C, a control station D, and power transmission lines 30 and 31. The transmission lines 30 and 31 are so-called parallel two-line transmission lines that connect between the electric station A and the electric station B.

  In electric power station A, bus 20, circuit breakers (CB) 40, 41, current transformers 50, 51, bus side transformer (VT) 55, line selection relay 60, bus side shortage A voltage relay 65, a telecon 70, line-side instrument transformers 120 and 121, line-side undervoltage relays 130 and 131, and automatic restoration equipment (ARE) 140 and 141 are provided.

  A circuit breaker 40 (first circuit breaker) is provided between the bus 20 (first bus) and the power transmission line 30 (first power transmission line). A circuit breaker 41 (second circuit breaker) is provided between the bus 20 and the power transmission line 31 (second power transmission line). Note that the distance from the bus 20 to the circuit breakers 40 and 41 is sufficiently shorter than the length of the power transmission lines 30 and 31.

  The circuit breakers 40 and 41 are interrupted based on, for example, an instruction from the line selection relay 60 and are turned on based on an instruction from the automatic recovery devices 140 and 141 or the telecon 70.

  The current transformer 50 measures the current flowing from the bus 20 to the power transmission line 30, and the current transformer 51 measures the current flowing from the bus 20 to the power transmission line 31. The bus side instrument transformer 55 is a transformer that steps down the voltage of the bus 20 at a predetermined ratio. The line-side instrument transformers 120 and 121 are transformers that step down the voltage of the transmission lines 30 and 31 at a predetermined ratio.

  The line selection relay 60 (first relay) detects that an accident (ground fault or short circuit) has occurred in the transmission line 30 or the transmission line 31 based on the measurement results of the current transformers 50 and 51, and The circuit breaker 40 or the circuit breaker 41 is blocked to be removed.

  The bus-side undervoltage relay 65 detects whether or not the voltage stepped down by the bus-side instrument transformer 55 is equal to or less than a predetermined value. The line-side undervoltage relay 130 (third relay) detects whether the voltage stepped down by the line-side instrument transformer 120 is equal to or lower than a predetermined value, and the line-side undervoltage relay 131 is It is detected whether or not the voltage stepped down by the instrument transformer 121 is equal to or lower than a predetermined value.

  The automatic restoration device 140 turns on the circuit breaker 40 that has been cut off due to an accident after a certain period of time, and the automatic restoration device 141 turns on the circuit breaker 41 that has been cut off due to an accident after the passage of a certain time.

  The telecon 70 (first monitoring device) monitors the states of the circuit breakers 40, 41, the line selection relay 60, the bus side undervoltage relay 65, the line side undervoltage relays 130, 131 provided in the electric station A, This is a so-called remote monitoring control device that controls the various devices described above. As shown in FIG. 2, the telecon 70 includes an IF (Interface) device 90, a time measuring device 91, a storage device 92, and a monitoring control device 93.

  The IF device 90 includes, for example, control data for controlling a device such as the circuit breaker 40 and SOE data (SOE: Sequence of Events) indicating so-called event information when the state of the device such as the circuit breaker 40 changes. It exchanges with a collection / delivery device (DX: Data Exchanger) 75. Although details will be described later, the SOE data includes information such as “time”, “device whose state has changed”, “operation state”, etc. when the state of the device has changed.

  The time measuring device 91 (first time measuring device) measures time, and the storage device 92 stores various data such as SOE data.

  The monitoring control device 93 monitors the state of a device such as the circuit breaker 40, and when the state of the device changes, acquires the time of the time measuring device 91 when the state of the device changes, generates SOE data, and stores the storage device 92. The monitoring control device 93 controls the circuit breaker 40 and the like based on the control data.

  In the electric station B, the bus 21, the circuit breakers 42 and 43, the current transformers 52 and 53, the bus-side instrument transformer 56, the line selection relay 61, the bus-side undervoltage relay 66, the telecon 71, and the line-side instrument transformer Devices 122 and 123, line side undervoltage relays 132 and 133, and automatic recovery devices 142 and 143 are provided.

  A circuit breaker 42 (third circuit breaker) is provided between the bus 21 (second bus) and the power transmission line 30, and a circuit breaker 43 (fourth circuit breaker) is disposed between the bus 21 and the power transmission line 31. Is provided. Note that the distance from the bus 21 to the circuit breakers 42 and 43 is sufficiently shorter than the length of the power transmission lines 30 and 31.

  The circuit breakers 42 and 43 are interrupted based on, for example, an instruction from the line selection relay 61 and are turned on based on an instruction from the automatic recovery devices 142 and 143 or the telecon 71.

  The current transformer 52 measures the current flowing from the bus 21 to the power transmission line 30, and the current transformer 53 measures the current flowing from the bus 21 to the power transmission line 31. The bus-side instrument transformer 56 is a transformer that steps down the voltage of the bus 21 at a predetermined ratio. The line-side instrument transformers 122 and 123 are transformers that step down the voltage of the transmission lines 30 and 31 at a predetermined ratio.

  The line selection relay 61 (second relay) detects that an accident (ground fault or short circuit) has occurred in the power transmission line 30 or the power transmission line 31 based on the measurement results of the current transformers 52 and 53, and detects the accident. The circuit breaker 42 or the circuit breaker 43 is blocked to be removed.

  The bus-side undervoltage relay 66 detects whether or not the voltage stepped down by the bus-side instrument transformer 56 is equal to or lower than a predetermined value. The line-side undervoltage relay 132 (fourth relay) detects whether the voltage stepped down by the line-side instrument transformer 122 is equal to or lower than a predetermined value, and the line-side undervoltage relay 133 is It is detected whether or not the voltage stepped down by the instrument transformer 123 is below a predetermined value.

  The automatic recovery device 142 turns on the circuit breaker 42 that has been shut off due to an accident after a certain time has elapsed, and the automatic recovery device 143 turns on the circuit breaker 43 that has been shut off due to an accident after a certain time has passed.

  The telecon 71 (second monitoring device) monitors the state of the circuit breakers 42, 43, the line selection relay 61, the bus side undervoltage relay 66, the line side undervoltage relays 132, 133 provided in the electric station B, This is a so-called remote monitoring control device that controls the various devices described above. As shown by the reference numerals enclosed in parentheses in FIG. 2, the telecon 71 includes an IF device 95, a time measuring device 96 (second time measuring device), a storage device 97, and a monitoring control device 98. The telecon device 71 is the same as the telecon device 70 except that it monitors and controls various devices provided in the electric station B, and thus detailed description thereof is omitted.

  In the relay station C, an information collection and distribution device 75 corresponding to the master station of the telecons 70 and 71 is provided. Based on the instruction from the control station D, the information collection / distribution device 75 acquires the SOE data of the telecons 70 and 71 corresponding to the slave stations and transmits them to the control station D. In addition, the information collection and distribution device 75 transmits control data from the control station D to the telecons 70 and 71. Furthermore, the information collection / distribution device 75 includes, for example, a time measurement device (not shown) included in the information collection / distribution device 75 with the time of the time measurement device 91 of the telecon 70 and the time of the time measurement device 96 of the telecon 71 at predetermined time intervals. Synchronize with the time.

  The control station D is provided with a control device 76 that controls the opening and closing of the circuit breakers 40 to 43 installed in the electric stations A and B, for example, based on an instruction from the operator. The control device 76 acquires SOE data from the information collection and distribution device 75 and displays system information indicating the state of various devices such as the circuit breaker 40 on a display device (not shown). Further, the control device 76 includes an accident point locating device 80 for locating the accident point based on the SOE data after an accident occurs on the transmission lines 30 and 31. Details of the accident point locator 80 will be described later.

== Accident point and operation of line selection relay 60, 61 ==
Here, with reference to FIGS. 3 to 6, for example, the operation of the line selection relays 60 and 61 when an accident occurs in the power transmission line 30 will be described. The lengths of the power transmission lines 30 and 31 are both L, for example. 3, for example, the distance from the bus 20 to the node to which the circuit breaker 40 and the power transmission line 30 are connected and the distance from the bus 21 to the node to which the circuit breaker 42 and the power transmission line 30 are connected are as follows: It should be negligibly short compared to the length of. Therefore, the section X illustrated in FIG. 3 is a section within 15% of the length L from the bus 20, and the section Z is a section within 15% of the length L from the bus 21. The section Y is an intermediate section between the transmission lines 30 and 31 excluding the section of 15% of the length L from the bus 20 and the section of 15% of the length L from the bus 21. For this reason, the distance of the section Y is, for example, 70% of the length L.

  First, when a ground fault occurs in the section X of the power transmission line 30, the current flowing from the bus 20 to the accident point via the power transmission line 30 increases rapidly. On the other hand, the current flowing through the power transmission line 31 to the accident point is small. In such a case, the line selection relay 60 first shuts off the circuit breaker 40 as shown in FIG. When the circuit breaker 40 is interrupted, a large current flows to the point of the accident via the bus 20, the power transmission line 31, the bus 21, and the power transmission line 30. For this reason, the line selection relay 61 interrupts the circuit breaker 42. That is, what is called series interruption | blocking by which the circuit breaker 42 is interrupted | blocked after the circuit breaker 40 is interrupted | blocked is performed. The time from when the circuit breaker 40 is interrupted until the circuit breaker 42 is interrupted is, for example, a predetermined time α determined based on the operation of the line selection relay 62, the circuit breaker 42, and the like.

  Next, when a ground fault occurs in the section Z of the transmission line 30, the line selection relay 61 first shuts off the circuit breaker 42, as shown in FIG. Then, when a predetermined time α elapses after the circuit breaker 42 is interrupted, the line selection relay 60 interrupts the circuit breaker 40.

  Further, when a ground fault occurs in the section Y of the transmission line 30, the line selection relays 60 and 61 close the circuit breakers 40 and 42 almost simultaneously as shown in FIG.

  In addition, although the ground fault accident of the power transmission line 30 was demonstrated here, the same may be said, for example in a short circuit accident. The same applies when an accident (ground fault or short circuit) occurs in the transmission line 31. Thus, when the accident which generate | occur | produces in a parallel 2 circuit power transmission line is detected by the line | wire selection relay 60 and 61, the order by which the circuit breakers 40-43 are interrupted | blocked changes with the generation | occurrence | production area of an accident.

== Details of the accident location system 80 ==
Here, the details of the accident location system 80 will be described with reference to FIG. The accident point locating device 80 is a device for locating an accident point based on SOE data, and includes a storage device 100 and a microcomputer 101.

  The storage device 100 stores synchronization data indicating whether the time of the timing device 91 of the telecon 70 and the time of the timing device 96 of the telecon 71 are synchronized, a program executed by the microcomputer 101, SOE data, and the like. . In the present embodiment, for example, when the error between the time of the time measuring device 91 and the time of the time measuring device 96 is sufficiently shorter than the predetermined time α, synchronization data (synchronized) indicating that synchronization is established is stored. It is stored in the device 100. On the other hand, when the above-described error is not negligible compared to the predetermined time α, synchronization data (no synchronization) indicating that synchronization is not established is stored in the storage device 100.

  The microcomputer 101 implements an acquisition unit 110, a calculation unit 111, a correction unit 112, and an orientation unit 113 by executing a program stored in the storage device 100.

  The acquisition unit 110 acquires the SOE data stored in the telecons 70 and 71 when an instruction for starting the location of the accident point is input. Then, when the synchronization data is “synchronized”, the acquisition unit 110 includes a time T1 (first time) when the circuit breaker 40 or the circuit breaker 41 is interrupted at the time of “accident removal” from the acquired SOE data, Time T2 (second time) when the circuit breaker 42 or the circuit breaker 43 is interrupted is acquired.

  On the other hand, when the synchronization data is “no synchronization”, the acquisition unit 110 receives the circuit breaker 40 or the circuit breaker 41 that was interrupted after the accident in addition to the above-described times T1 and T2, and the line side undervoltage relay 130 or Time T3 (third time) when the line-side undervoltage relay 131 is restored is acquired. For example, the time when the line-side undervoltage relay 130 is restored is the time when the voltage from the line-side instrument transformer 120 becomes higher than a predetermined value. Further, the acquisition unit 110 sets a time T4 (fourth time) when the circuit breaker 40 or the circuit breaker 41 that has been interrupted after the accident is turned on and the line side undervoltage relay 132 or the line side undervoltage relay 133 is restored. get. For example, after the accident, when the circuit breaker 40 is turned on, the timing when the line-side undervoltage relay 130 is restored and the timing when the line-side undervoltage relay 132 is restored are almost the same. Similarly, the timing at which the line-side undervoltage relay 131 is restored when the circuit breaker 41 is turned on and the timing at which the line-side undervoltage relay 133 is restored are almost the same. For this reason, for example, by comparing the times T3 and T4, it is possible to grasp the difference between the time of the time measuring device 91 and the time of the time measuring device 96. For example, when the time of the time measuring device 91 of the telecon 70 is delayed with respect to the time of the time measuring device 96 of the telecon 71, as shown in FIG. 8, the time T4 when the line side undervoltage relay 132 returns is It becomes later than time T3 when the undervoltage relay 130 is restored. In addition, when the time of the time measuring device 91 and the time of the time measuring device 96 are synchronized, the difference between the times T3 and T4 is almost zero. In addition, after the accident, the timing when the circuit breaker 40 is turned on and the line side undervoltage relays 130 and 132 are restored is the timing when the voltage of the bus 20 is applied to the power transmission line 30 so-called “line voltage exists”. . The timing at which the circuit breaker 41 is turned on and the line-side undervoltage relays 131 and 133 are restored is the timing when “the line voltage is present” when the voltage of the bus 20 is applied to the power transmission line 31.

  When the synchronization data “no synchronization” is stored in the storage device 100, the calculation unit 111 calculates the difference between the time of the time measuring device 91 and the time of the time measuring device 96 based on the times T3 and T4.

  The correction unit 112 corrects either the time T1 or the time T2 when the circuit breaker is cut off, using the difference calculated by the calculation unit 111.

  The orientation unit 113 processes each of the times T1 and T2 in the case of “with synchronization” as times TA and TB which are time information when the accident point is located. On the other hand, in the case of “no synchronization”, the orientation unit 113 processes the correction result of the correction unit 112 as times TA and TB which are time information when the accident point is located.

== An example of processing executed by the microcomputer 101 ==
Here, an example of processing executed by the microcomputer 101 of the accident point locating apparatus 80 will be described with reference to FIGS. 9 and 10. Here, it is assumed that an accident occurring in the power system 10 is removed, and that the voltage of the bus 20 is applied to the power transmission lines 30 and 31.

  First, when there is an instruction for accident point location from the operator, the acquisition unit 110 refers to the synchronization data in the storage device 100 (S100). If the synchronization data is “with synchronization” (S100: YES), the acquisition unit 110 acquires times T1 and T2 (S101).

And the orientation part 113 processes time T1, T2 as time TA (TA = T1) and TB (TB = T2) at the time of orientation of an accident point. Specifically, the orientation unit 113 first determines whether or not the time TA is earlier than the time TB (S102).

When the time TA is earlier than the time TB (S102: YES), the orientation unit 113 determines whether or not the difference between the time TB and the time TA (TB-TA) is greater than the predetermined time α (S103). When the difference between the time TB and the time TA is larger than the predetermined time α (S103: YES), that is, after the circuit breaker 40 or the circuit breaker 41 is cut off, at least after the predetermined time α has passed, the circuit breaker 42 or the circuit breaker. When 43 is interrupted, the orientation unit 113 determines that the accident point has occurred in the range X (S104). On the other hand, when the difference between the time TB and the time TA is smaller than the predetermined time α (S103: NO), the orientation unit 113 determines that the accident point has occurred in the range Y (S105).

If the time TA is later than the time TB in the process S102 (S102: NO), it is determined whether or not the difference between the time TA and the time TB (TA-TB) is greater than the predetermined time α (S106). When the difference between the time TA and the time TB is larger than the predetermined time α (S106: YES), that is, after the circuit breaker 42 or the circuit breaker 43 is interrupted, at least the predetermined time α has elapsed, the circuit breaker 40 or the circuit breaker. When 41 is interrupted, the orientation unit 113 determines that the accident point has occurred in the range Z (S104). On the other hand, when the difference between the time TB and the time TA is smaller than the predetermined time α (S106: NO), the orientation unit 113 determines that the accident point has occurred in the range Y (S105).

  In the process S100, when the synchronization data is “no synchronization” (S100: NO), the acquisition unit 110 acquires times T1 to T4. Then, the acquisition unit 110 causes the calculation unit 111 and the correction unit 112 to perform a correction process S111 as illustrated in FIG.

  First, the calculation unit 111 determines whether or not the time T3 is earlier than the time T4 (S200). When the time T3 is earlier than the time T4 (S200: YES), the calculation unit 111 calculates the correction time τ = T4-T3 (S201). The correction unit 112 adds the correction time τ to the time T1, and sets the corrected time T1 as time TA and time T2 as time TB (S202). When the process S202 is executed, the orientation unit 113 executes the above-described process S102 based on the times TA and TB executed in the process S202.

  Further, when the time T3 is later than the time T4 (S200: NO), the calculation unit 111 calculates the correction time τ = T3-T4 (S203). Then, the correction unit 112 adds the correction time τ to the time T2, sets the corrected time T2 as time TB, and sets the time T1 as time TA (S204). When the process S204 is executed, the orientation unit 113 executes the above-described process S102 based on the times TA and TB executed in the process S204.

In this manner, the orientation unit 113 locates the accident point based on the times TA and TB after the correction process S111 is executed (S104, S105, and S107).

== An example of a process in which the accident point locating device 80 locates an accident point ==
Here, when the SOE data as shown in FIG. 11 is acquired from the telecons 70 and 71, a process in which the accident point locating device 80 locates the accident point will be described. Note that the SOE data in FIG. 11 is data acquired after the timing at which the accident that occurred in the range X is eliminated and the state where the “line voltage is present” is obtained.

  Generally, the so-called series interruption interval is about 100 to 130 ms in the case of a short circuit accident, and about 160 to 190 ms in the case of a ground fault. For this reason, in this embodiment, for example, the predetermined time α is set to 100 ms, for example. In addition, the information collection and distribution device 75 synchronizes the time of the timing device 91 and the time of the timing device 96 with the time of the timing device (not shown) included in the information collection and distribution device 75, for example, every 30 minutes. And However, it is assumed that the time of the time measuring devices 91 and 96 has an error within ± 300 ms, for example, with respect to the time of the time measuring device of the information collection and distribution device 75. Therefore, in the present embodiment, the storage device 100 stores in advance synchronization data indicating “no synchronization”.

  First, when there is an instruction for accident point location from the operator, the synchronization data in the storage device 100 is “no synchronization” (S100: NO), and the acquisition unit 110 acquires times T1 to T4 (S110). .

  Here, the time T1 is “09: 27: 18.24” because it is the time when the circuit breaker 40 is cut off (“OFF”). Of “09: 27: 18.24”, “09:27:18” is 9:27:18, and “0.24” is 240 ms. Since the time T2 is the time when the circuit breaker 42 is cut off (“OFF”), it is “09: 27: 18.96”. Furthermore, since the time T3 is the time when the line-side undervoltage relay 130 after the circuit breaker 40 is turned on (“voltage present”), it is “09: 27: 34.53”. The time T4 is “09: 27: 35.11” because it is the time when the line-side undervoltage relay 132 after the circuit breaker 40 is turned on (“voltage present”). In addition, the time when the circuit breaker 40 was turned on is “09: 27: 34.38”.

  Since the time T3 “09: 27: 34.53” is earlier than the time T4 “09: 27: 35.11” (S200: YES), the correction time τ is 580 ms (S201). Therefore, from time TA = T1 + τ = “09: 27: 18.24” +580 ms, time TA becomes “09: 27: 18.82” and time TB (= T2) becomes “09: 27: 18.96”. (S202).

  The above-described time TA is earlier than time TB (S102: YES), and time TB-time TA is “160 ms” (S103). Since “160 ms” is longer than the predetermined time of 100 ms (S103: YES), the accident point is determined to be in the range X (S104).

  In the above, the accident point location apparatus 80 which is one Embodiment of this invention was demonstrated. In the present embodiment, the accident point can be determined without newly providing an expensive measuring device such as a fault locator or a special relay. That is, by using the accident point locating device 80, it is possible to specify the range of the accident point without newly providing expensive equipment. In addition, the labor when the worker searches for the accident point can be reduced.

  In addition, when there is a large difference in the time of the time measuring devices 91 and 96, for example, the accident point may not be accurately determined only from the times T1 and T2 when the circuit breakers 40 and 42 are interrupted. However, since the accident point locating device 80 acquires the times T3 and T4 based on the event ("with line voltage") that occurs at almost the same timing, the difference between the time of the time measuring device 91 and the time of the time measuring device 96 is obtained. Can be grasped. For this reason, in this embodiment, even if it is a case where there exists a big shift in the time of the time measuring devices 91 and 96, the accident point can be accurately determined. Furthermore, since the times T3 and T4 when the “line voltage is present” are acquired, for example, it is possible to accurately pinpoint the accident point even in an electric station where a special relay or the like is not provided.

  Further, when there is a large difference in the time of the time measuring devices 91 and 96, for example, by executing the correction process S111 as shown in FIG. For example, the time T1-T3 and the time T2-T4 are respectively calculated, and it is similarly accurately determined whether the difference between (T1-T3) and (T2-T4) is greater than the predetermined time α. Accident points can be located.

  Further, as described above, when an accident (first accident) occurs in the transmission line 30, the time when each of the line-side undervoltage relays 130 and 132 detects that the voltage of the transmission line 30 is equal to or higher than a predetermined value. Is time T3, T4, the accident point can be determined with high accuracy. Similarly, when an accident occurs in the transmission line 31, the times when the line-side undervoltage relays 131 and 133 detect that the voltage of the transmission line 31 is equal to or higher than a predetermined time are time T3 and T4. Therefore, the accident point can be accurately determined.

  In addition, the said Example is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

  For example, when the ground fault overvoltage relays in which the ground fault has occurred are provided in the electric stations A and B, the times when the ground fault over voltage relays in the electric stations A and B are operated are time T3 and T4. It is also good. That is, if the times T3 and T4 are acquired based on events that occur at substantially the same timing, the same effects as in the present embodiment can be obtained.

  For example, when the time measuring devices 91 and 96 are radio timepieces or the like, synchronization data “with synchronization” is stored in the storage device 100 in advance. In such a case, the correction process S111 is not executed.

  For example, when a short circuit accident occurs in the power transmission lines 30 and 31, for example, the voltage of the buses 20 and 21 is greatly reduced. In such a case, the bus-side undervoltage relays 65 and 66 detect that the voltages of the buses 20 and 21 are equal to or lower than a predetermined value at substantially the same timing. For this reason, the same effect as this embodiment can be obtained even when the times when the bus side undervoltage relays 65 and 66 detect that the voltages of the buses 20 and 21 are equal to or lower than the predetermined time are set to the times T3 and T4.

  Further, for example, the section X is a section within 20% of the length L from the bus 20, the section Z is a section within 20% of the length L from the bus 21, and the distance of the section Y is the length It may be 60% of L.

10 Power System 20, 21 Busbar 30, 31 Transmission Line 40-43 Breaker (CB)
50-53 Current transformer 55, 56 Bus side instrument transformer (VT)
60, 61 Line selection relay 65, 66 Bus side undervoltage relay 70, 71 Telecon 75 Information collection and distribution device (DX)
76 Control device 80 Accident point location device 90, 95 IF device 91, 96 Timekeeping device 92, 97 Storage device 93, 98 Monitoring control device 100 Storage device 101 Microcomputer 110 Acquisition unit 111 Calculation unit 112 Correction unit 113 Standardization unit 120-123 Line Side instrument transformer (VT)
130 to 133 Line side undervoltage relay 140 to 143 Automatic recovery device (ARE)

Claims (3)

First and second power transmission lines provided between the first and second busbars;
When a first short circuit or ground fault occurs in the first power transmission line based on a current flowing from the first bus line to the first power transmission line and a current flowing from the first bus line to the second power transmission line In addition, when the first circuit breaker provided between the first bus and the first power transmission line is cut off and a second short circuit or ground fault occurs in the second power transmission line, the first bus And a first relay that interrupts a second circuit breaker provided between the second power transmission lines,
When the first accident occurs in the first power transmission line based on the current flowing from the second bus to the first power transmission line and the current flowing from the second bus to the second power transmission line, the second A third circuit breaker provided between the bus and the first power transmission line is interrupted, and when the second accident occurs in the second power transmission line, between the second bus and the second power transmission line. A second relay for interrupting the provided fourth circuit breaker;
A time that includes a first timing device that counts time, monitors the states of the first and second circuit breakers, and times the first timing device when the states of the first and second circuit breakers change A first monitoring device for storing
Includes a second time measurement device for measuring time, said third and monitors the state of the fourth circuit breaker, it said third and said time second counting device for counting the fourth when the breaker changes state A second monitoring device for storing
An accident point locating device in an electric station comprising:
A first acquisition unit for acquiring a first time stored in the first monitoring device and storing a first time when the first or second circuit breaker is interrupted;
A second time when the second time when the third or fourth circuit breaker is cut off is stored in the second monitoring device, and the second time is stored in the second monitoring device;
Based on the determination result of whether the first time is earlier than the second time and the determination result of whether the difference between the first time and the second time is greater than a predetermined time, the first time An orientation section that locates the accident point where the first or second accident occurred,
An accident location system characterized by including The accident point locating device according to claim 1,
After the first or second accident occurs and either one of the first or second circuit breakers is interrupted, one of the circuit breakers is turned on, and the first or second circuit breaker is inserted. A third time when the voltage of the first bus is applied to any one of the power transmission lines of the electric wire is stored in the first monitoring device, and the third time stored in the first monitoring device is acquired. A third acquisition unit;
After the occurrence of the first or second accident and the breaker of either the third or the fourth breaker is cut off, the breaker of the first or the second breaker that has been cut off A fourth time when the voltage of the first bus is applied to any one of the transmission lines is stored in the second monitoring device, and the second time stored in the second monitoring device. A fourth acquisition unit for acquiring four times;
Based on the third and fourth times, a calculation unit that calculates an error between the time measured by the first time measuring device and the time measured by the second time measuring device;
A correction unit that corrects one of the first and second times using the error; and
Further comprising
The orientation part is
And it corrected the one time, on the basis of the other time of the first or second time, to locating the fault point,
Accident point locator characterized by The accident point locating device according to claim 2 ,
The first monitoring device includes:
Monitoring the state of the third relay for detecting whether or not the voltage on the first bus side of the first transmission line is equal to or lower than a predetermined value, and the first timing device when the state of the third relay changes Remembers the time when
The second monitoring device is
Monitoring the state of the fourth relay that detects whether or not the voltage on the second bus side of the one transmission line is equal to or lower than a predetermined value, and the second timing device when the state of the fourth relay changes Remember the time to time,
The third acquisition unit includes
After the occurrence of the first accident, a third time when the third relay detects that the voltage of the first transmission line is equal to or higher than a predetermined value is stored in the first monitoring device, and the first monitoring device Obtaining the third time stored in
The fourth acquisition unit includes:
After the first accident occurs, a fourth time when the fourth relay detects that the voltage of the first power transmission line is equal to or higher than a predetermined value is stored in the second monitoring device, and the second monitoring device To obtain the fourth time stored in
The orientation part is
Locating the accident point based on the first to fourth times,
Accident point locator characterized by

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