JP4573811B2 - Microcarrier relay system and microcarrier relay automatic return method - Google Patents

Description

  The present invention relates to a microcarrier relay system for protecting a power system for power transmission and a method for automatically returning a microcarrier relay.

  In a microcarrier relay system, a relay device that is installed in a power plant or substation to cut off a transmission line to protect an electric power system uses a microwave to transmit signals such as monitoring data indicating the monitoring result of the transmission line. To send and receive. That is, in the microcarrier relay system, the relay devices are connected by a micro line that is a transmission path using microwaves.

By the way, when fading occurs and the propagation state of the microwave changes, the reception level of the signal by the micro line decreases. In this case, the relay device locks the relay when no signal such as monitoring data is received for a predetermined time, and leaves the protection to another relay device or the like (see, for example, Patent Document 1).
JP 2002-315175 A

  As described above, when fading occurs and a signal such as monitoring data is not received for a predetermined time, the relay device is locked. However, since this state is not due to the failure of the relay device itself, it is necessary to unlock the relay device in order to improve the reliability of the power system that is the protection target of the microcarrier relay system. For this reason, if it is not possible to determine whether it is fading, an operator goes to the power plant or substation where the relay device is installed, confirms that the relay is locked due to the occurrence of fading, and that there is an abnormality in the relay device. Make sure that there is no lock and unlock the relay device.

  An object of the present invention is to provide a microcarrier relay system and a microcarrier relay automatic return method that can automatically release the lock when the relay device is locked due to fading, solving the above-described problems. There is.

  In order to solve the above problems, the invention of claim 1 is directed to fading in a microcarrier relay system in which a relay device installed for protection of a power system transmits monitoring data of the power system to each other by microwaves. A detecting means for detecting occurrence of occurrence of a fading, and when the detecting means detects fading, a transition of an occurrence time interval at which fading occurs between the occurrence of the first fading and the elapse of a preset measurement time is measured. Estimating means for estimating the time when fading is completed based on the time series data, and the relay apparatus when the relay apparatus is in a locked state because it does not receive a signal from the counterpart relay apparatus When the end time estimated by the estimating means is reached, the And output means for outputting a signal, is the relay device receives the release signal from said output means is a micro-carrier relay system characterized by releasing the locked state.

  In the first aspect of the invention, the detection means detects the occurrence of fading. When the detection means detects fading, the estimation means estimates the time at which fading ends based on the time interval at which fading occurs. When the relay device is in a locked state because the relay device does not receive a signal from the counterpart relay device and the relay device is not out of order, the output means outputs a release signal to the relay device when the estimated time is reached. Is output. When the relay device receives the release signal from the output means, the relay device releases the locked state.

  According to a second aspect of the present invention, in the microcarrier relay system according to the first aspect, the estimation means accumulates the generation time from the occurrence of fading to the end, and when the generation time is longer than the previous time, The previous occurrence time is updated with the occurrence time of the occurrence as the maximum occurrence time, and the maximum occurrence time updated last is used as the fading measurement time.

  According to a third aspect of the present invention, in the microcarrier relay system according to the first or second aspect, the estimation unit calculates a time interval between adjacent fadings based on a detection result of the detection unit. Time-series data is used, and the time at which fading ends is estimated from the transition of adjacent fading occurrence time intervals represented by the time-series data.

  According to a fourth aspect of the present invention, in the microcarrier relay system according to the first or second aspect, the estimating means calculates the occurrence time intervals of adjacent fading based on the detection result of the detecting means. This time series data is divided into predetermined time intervals, and the minimum occurrence time interval is extracted as the minimum occurrence time interval to obtain the time series data. The time when fading ends is estimated from the transition of the minimum occurrence time interval represented by.

  According to a fifth aspect of the present invention, in the microcarrier relay system according to the third or fourth aspect, the estimation unit generates a regression equation by regression analysis of the time series data, and fading is completed using the regression equation. The time to perform is estimated.

  The invention according to claim 6 is a method of automatically returning a microcarrier relay in which a relay device installed for protection of a power system transmits monitoring data of the power system to each other by microwaves. When fading is detected, The transition of the generation time interval at which fading occurs between the occurrence of the first fading and the lapse of the measurement time is taken as time series data, and the time at which fading ends is estimated based on this time series data. When the relay device is not in failure when receiving a signal from the counterpart relay device and the relay device is not out of order, when the estimated time of fading is reached, a release signal is output to the relay device, and the relay When the device receives the release signal from the output means, the device releases the locked state. It is an automatic method of returning Arire.

  According to the invention of claim 1 or claim 6, when the relay device is locked due to fading and the relay device is not malfunctioning, the time for fading is estimated, and when this time is reached, the release signal is sent to the relay device. Is output, the relay device can be unlocked automatically. As a result, when it is not possible to determine whether fading has occurred as in the prior art, it is possible to make it unnecessary to arrange an operator to release the lock and to go to the place where the relay device is installed.

  According to the invention of claim 2, since the fading time is estimated based on the fading that occurred during the previously updated measurement time, the past fading has occurred without the measurement time being too long or too short. Thus, the fading end time can be estimated with the optimum measurement time.

  According to the invention of claim 3, since the fading end time is estimated from the transition of the adjacent fading occurrence time interval, the detailed change in the adjacent fading occurrence time interval is referred to the estimation of the fading end time. Can do.

  According to the invention of claim 4, the minimum occurrence time interval is extracted as the minimum occurrence time interval among the occurrence time intervals of each section divided by a predetermined time interval, and fading is completed from the transition of these minimum occurrence time intervals. Therefore, the processing load can be reduced by reducing the number of data to be processed for estimation.

  According to the fifth aspect of the present invention, since the fading end time is calculated by calculation using a regression equation, the processing for estimation can be simplified by using the calculation equation.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
A microcarrier relay system according to this embodiment is shown in FIG. In this microcarrier relay system, for example, both the substation 11 and the substation 12 monitor the ultrahigh-voltage transmission line 1 installed between them, and transmit and receive signals including monitoring data indicating the monitoring result. . The management center 20 performs management of the substations 11 and 12 and the power transmission line 1. This microcarrier relay system includes a relay (Ry) device 11A, a radio device 11B and a signal terminal device 11C installed in a substation 11, a relay (Ry) device 12A installed in a substation 12, and a radio device. 12B, a signal terminal device 12C, an analyzer 13, a processing device 21 installed in the management center 20, and signal transmission devices 22 and 23.

  The signal terminal device 11C of the substation 11 is an interface for connecting the relay device 11A and the radio device 11B.

  The relay device 11A of the substation 11 protects the power transmission line 1 and transmits data transmission such as monitoring data as a monitoring result of the power transmission line 1 via the signal terminal device 11C and the radio device 11B. Perform with substation 12. Further, the relay device 11A is connected to the management center 20 via a communication network (not shown), for example.

  11 A of relay apparatuses detect the electrical property of the self-end side in the power transmission line 1, for example, a voltage, an electric current, and a phase, These are used as monitoring data, and the substation which is the other end side through the signal terminal device 11C and the radio | wireless machine 11B Send to place 12. Moreover, 11 A of relay apparatuses receive the monitoring data from the substation 12 side via the radio | wireless machine 11B and the signal terminal station apparatus 11C. Then, the relay device 11A determines whether or not there is an accident using the monitoring data on the own end side and the monitoring data on the other end side, and causes the circuit breaker (not shown) installed in the transmission line 1 to Control according to.

  When the relay device 11A does not receive a signal including monitoring data from the substation 12 via the radio device 11B and the signal terminal device 11C for a predetermined time, the relay device 11A makes the relay not used by locking the relay. Then, the relay device 11A sends a relay operation state signal indicating that the relay is not used to the management center 20. This relay operation state signal includes a signal indicating whether or not the relay device 11A is out of order. Thereafter, when the relay device 11A receives the release signal from the management center 20, the relay device 11A uses the relay not used as a relay and releases the lock of the relay.

The wireless device 11B forms a transmission line using microwaves (hereinafter referred to as a micro line) together with the wireless device 12B of the substation 12. Radio 11B, when via the signal terminal station device 11C receives the monitoring data from the relay apparatus 11A, transmits the data to the substation 12 from the antenna 11B ₁ that comes by microwave. Further, when the antenna 11B ₁ receives the microwave and outputs a high-frequency signal, the wireless device 11B reproduces monitoring data from this signal and sends it to the relay device 11A via the signal terminal device 11C. That is, the microcarrier relay is formed by the relay device 11A, the radio device 11B, the antenna 12A, and the signal terminal device 11C.

And the relay apparatus 12A of the substation 12, the antenna 12B ₁ radio 12B and accessories, and the signal terminal station device 12C, and the relay device 11A of the substation 11, the radio 11B and the antenna 11B _1, the signal terminal station device Since this is the same as 11C, a description thereof will be omitted.

  For example, the analyzer 13 checks the level of the microwave used for the micro-circuit between the substation 11 and the substation 12 to detect the occurrence of fading. When the analyzer 13 detects the occurrence of fading from a decrease in the level of the microwave, the analyzer 13 sends a detection signal indicating the occurrence of fading and reception level data indicating the reception level of the micro line via a communication network (not shown). The data is sent to the processing device 21 of the management center 20. The reception level data represents the reception level based on an AGC voltage of an AGC (Automatic Gain Control) circuit of a reception device (not shown) provided in the analyzer 13, for example. Two analyzers 13 may be used in the vicinity of the substation 11 and the substation 12.

  The processing device 21 of the management center 20 estimates the time when the occurrence probability of fading becomes zero, and includes a communication unit 21A, a processing unit 21B, and an output unit 21C.

  The communication unit 21A performs data transmission with the relay device 11A of the substation 11, the relay device 12A of the substation 12 and the analyzer 13 via a communication network (not shown), and the detection signal received from the analyzer 13 and The reception level data of the micro line is sent to the processing unit 21B, the relay operation status signal received from the relay device 11A is sent to the signal transmission device 22, and the relay operation status signal received from the relay device 12A is sent to the signal transmission device 23.

  The processing unit 21B performs an estimation process illustrated in FIG. 2 in order to estimate a time when the occurrence probability of fading becomes zero. When the processing unit 21B receives the detection signal and the reception level data of the micro line from the analyzer 13 via the communication unit 21A, the processing unit 21B starts an estimation process, and performs a preliminary data accumulation process based on the reception level data of the micro line (step S1). ).

In step S1, the processing unit 21B records in advance the maximum occurrence time T _max in the micro line formed between the substation 11 and the substation 12 from the reception level data of the micro line. The maximum occurrence time T _max is the longest time during which a series of fading occurs. For example, when fading occurs from 10 am and the last fading occurs at 2 pm, the maximum occurrence time T _max is 4 hours. Also, when the occurrence of fading only once, the processing unit 21B is set to 30 minutes maximum generation time T _max. Further, when the maximum occurrence time T _max is 24 hours or longer, the fading is recorded next time. Thus, whenever the fading occurs, the maximum occurrence time T _max is recorded, and when a time larger than the previously updated maximum occurrence time T _max is recorded, the previously updated maximum occurrence time T _max is automatically set to this value. Update to Thus, the processing unit 21B records and accumulates the maximum occurrence time T _max that is time data and updates the maximum occurrence time T _max .

In step S1, the processing unit 21B receives the reception level at which the fading occurrence probability after fading restoration of the micro line is zero based on the reception level data received from the analyzer 13 via the communication unit 21A (hereinafter referred to as the minimum reception level). L _min ). In other words, after the fading occurs and the reception level decreases and the micro line is disconnected, the reception level estimated that the fading is not caused by the recovery of the micro line is the minimum reception level L _min .

  After step S1, when receiving a detection signal indicating the occurrence of fading from the analyzer 13 (step S2), the processing unit 21B performs a real process of data collection (step S3).

In step S3, when the processing unit 21B receives the detection signal in step S2, the processing unit 21B extracts the maximum occurrence time T _max updated last in step S1, and also extracts the minimum reception level L _min managed.

Further, in step S3, the processing unit 21B ensures the sample measurement time from the first fading occurrence time to the time when the maximum occurrence time _Tmax has elapsed. Then, as illustrated in FIG. 3, the processing unit 21B detects time series data representing fading occurrence time intervals as time passes, that is, fading occurrence time interval data DA1. The processing unit 21B specifically obtains the fading occurrence time interval data DA1 as follows. For example, if the maximum occurrence time T _max is 9 hours and the N fading occurs at each occurrence time as shown in FIG. 4, the processing unit 21B sets the occurrence time interval of fading that occurs over time as follows. Calculate as follows. Since the occurrence time of the first fading is 3:10:10 and the occurrence time of the second fading is 3:10:20, the processing unit 21B starts from the second occurrence time. The generation time interval is 10 seconds, which is the time obtained by subtracting the first generation time, and this generation time interval is set as the first data S1. Similarly, the processing unit 21B calculates data S2 to Sn-1. Thus, the processing unit 21B, as a specific example of the fading occurrence time interval data DA1 in FIG. 4, to obtain a fading generation time interval data DA1 ₁ shown in FIG.

In step S3, as shown in FIG. 6, the processing unit 21B generates fading occurrence time interval data DA2 for the absolute time, which is a time based on the first occurrence time, from the fading occurrence time interval data DA1. If fading occurs time interval data DA1 ₁ in FIG. 5, the fading occurrence time interval data DA2 ₁ with respect to the absolute time is as shown in FIG.

Further, the processing unit 21B in step S3 divides the maximum generation time T _max in the data point spacing T _DP is a measurement time set in advance, the minimum time of occurrence within the time interval of generation of fading that occurs in each time zone An interval (hereinafter referred to as a minimum time interval _Tmin ) is extracted. Thereby, the processing unit 21B generates the minimum time interval data DA3 shown in FIG. Specifically in the case of fading generated time interval data DA1 ₁ in FIG. 5, to obtain the minimum time interval data DA3 ₁ shown in FIG. Data point spacing in minimum time interval data DA3 ₁ is, for example 30 minutes, the first data point 1, start time is 3:00 10 minutes 10 seconds which is the time of occurrence of FIG 5, from the beginning time after 30 minutes Time is the end time. If the minimum occurrence time interval is 10 seconds among the occurrence time intervals (10 seconds, 40 seconds, 30 seconds, 60 seconds,...) Of fading occurring during this period, the minimum time interval T _{min is set} to 10 seconds. To do. The processing unit 21B generates the minimum time interval T _min in the same manner as described below.

After step S3, the processing unit 21B determines whether or not the reception level is _{equal to} or higher than the minimum reception level _Lmin from the reception level data received from the analyzer 13 via the communication unit 21A (step S4). A specific example of the reception level and the generation time interval is shown in FIG. 10, and a graph of FIG. 10 is shown in FIG. Based on such data, in the specific example, −30 db is set in the processing unit 21B as the minimum reception level L _min . If the reception level is lower than the lowest reception level L _min in step S4, the processing section 21B returns the process to step S3. When the reception level is at least the minimum reception level L _{min in} step S4, in the specific example, −30 db or more, the processing unit 21B performs a moving average process (step S5).

In step S5, if the value is shown in FIG. 12, for example the relationship between the data points and the minimum time interval T _min of the minimum time interval data DA3 obtained in step S3, the moving average process, DP (data points) for 8 Estimation Calculation and DP (data point) 15 estimation calculation are performed. The calculation of DP8 estimation calculates the average value from data points 1 to 8, then calculates the average value from data points 2 to 9, and moves from the sum of the previous 8 days in order to move short-term Calculate the average. DP8 estimation indicates the state of the occurrence time interval for a short period. Similarly, the calculation of DP15 estimation calculates the average value from data points 1 to 15, then calculates the average value from data points 2 to 16, and the total value traced back in the past 15 days To calculate the long-term moving average. DP15 estimation indicates the state of the long time interval of occurrence. Then, as illustrated in FIG. 13, the processing unit 21 </ b> B determines whether each value of DP8 estimation approaches each value of DP15 estimation and is in a state where fading converges (step S <b> 6). If fading does not converge in step S6, processing unit 21B returns the process to step S3.

  When fading converges in step S6, the processing unit 21B generates a similar estimation curve representing the relationship between absolute time and occurrence time interval (step S7). In this embodiment, a regression equation obtained by regression analysis is used as the similar estimation curve.

In step S7, for example, when the data including the absolute time and the occurrence time interval illustrated in FIG. 14 is used, the processing unit 21B obtains analysis data illustrated in FIG. 15 by regression analysis. FIG. 14 shows an example in which the maximum occurrence time T _max is 9 hours and the data point interval T _DP is 30 minutes. By verifying the t value and the P value from the analysis data, it is possible to check the degree of influence of each explanatory variable on the target variable, and the F value can confirm the significance of the analysis data. The validity of the analysis data can be examined by the R2 value.

In step S7, when the processing unit 21B obtains the intercept value b and the absolute time (seconds), that is, the value of the slope a as coefficients by regression analysis, the relationship between the absolute time value X and the occurrence time interval y from these values. A linear regression equation representing
y = aX + b
Is generated. In the specific example of FIG.
Section: -12.642
Tilt: 0.152516
Therefore, the processing unit 21B uses a regression equation as
y = 0.152516X-12.642
Get. When this regression equation is applied to the specific example of FIG. 14, it is as shown in FIG. In FIG. 16, the regression equation is a straight line A1.

After step S7, the processing unit 21B determines whether or not the maximum value of the occurrence time interval at the maximum occurrence time _Tmax can be plotted above the similarity estimation curve (step S8). In the specific example of FIG. 16, among each occurrence time interval where the maximum occurrence time is 9 hours, 7140 seconds at point B is the maximum value of the occurrence time interval.

  If the maximum value of the occurrence time interval can be plotted above the similar estimation curve in step S8, the processing unit 21B estimates the time when the probability of occurrence of fading becomes zero (step S9).

In step S9, the processing unit 21B substitutes the maximum value of the occurrence time interval into the similarity estimation curve, and estimates the absolute time Tp corresponding to the maximum value of the occurrence time interval. In the specific example of FIG. 16, the regression equation is
y = 0.152516X-12.642
Therefore, the processing unit 21B substitutes 7140 seconds for the value y,
7140 = 0.152516X-12.642
From this, a value X of 46897 seconds is obtained. This value X is the absolute time Tp.

Further, after estimating the absolute time Tp in step S9, the processing unit 21B determines how many hours later this maximum time Tp is from the maximum occurrence time _Tmax .
Tp-T _max
Calculated by In the specific example of FIG. 16, since the maximum occurrence time T _max is 32400 seconds (9 hours) and the absolute time Tp is 46897 seconds (13 hours 1 minute 37 seconds), the processing unit 21B
46897-32400
Thus, 14497 seconds, that is, 4 hours, 1 minute, and 37 seconds is set as a time Tk at which the probability of fading is zero. Thereafter, the processing unit 21B uses the time Tk to calculate the time when the probability of occurrence of fading becomes zero.

If it can not be the maximum value of the generation time interval in step S8 is plotted above the similar estimation curve, the processing unit 21B uses the maximum generation time T _max as the time Tk the probability of fading occurring becomes zero (Step S10), and the estimation process ends.

  After step S9, when the processing unit 21B determines from the reception level data representing the reception level of the micro line obtained from the analyzer 13 that fading has occurred (step S11), the processing unit 21B returns the process to step S3, If it is determined in step S11 that fading has not occurred, the estimation process is terminated.

  In this way, the processing unit 21B performs the estimation process, and estimates the time when the probability that the fading will eventually occur becomes zero. When a plurality of analyzers 13 are installed, the processing unit 21B performs estimation processing based on the reception level data from each analyzer 13, and estimates each time when the probability of occurrence of fading becomes zero. Then, the latest time may be the time when the probability of occurrence of fading becomes zero.

  The output unit 21C receives from the processing unit 21B the time when the probability of occurrence of fading becomes zero. Then, at this time, the output unit 21 </ b> C generates a release signal for releasing the locked state of the relay devices 11 </ b> A and 12 </ b> A and sends the release signal to the signal transmission devices 22 and 23.

  The signal transmission device 22 transmits a release signal from the output unit 21C to the relay device 11A of the substation 11 according to the relay operation state signal received from the communication unit 21A, and includes a relay operation output unit 22A, a gate 22B, And a communication unit 22C. The signal transmission device 23 transmits a release signal from the output unit 21C to the relay device 12A of the substation 12 according to the relay operation state signal received from the communication unit 21A. 23B and a communication unit 23C. Since the signal transmission device 23 is the same as the signal generation unit 22, the signal transmission device 22 will be described.

  The relay operation output unit 22A of the signal transmission device 22 outputs a high level signal when the relay operation state signal is from the relay device 11A of the substation 11 and indicates that there is no failure in the relay alone. When the signal is output to the gate 22B and these conditions are not met, a low level signal is output to the gate 22B. The gate 22B is an AND gate circuit. When a high level signal is received from the relay operation output unit 22A, the gate 22B sends the signal to the communication unit 22C through a release signal from the output unit 21C. When receiving the release signal from the gate 22B, the communication unit 22C transmits this signal to the relay device 11A of the substation 11 via a communication network (not shown).

  Next, a method for automatically returning the microcarrier relay according to this embodiment will be described. When fading occurs and data transmission between the substation 11 and the substation 12 via the micro line is not possible for a predetermined time, the relay device 11A of the substation 11 and the relay device 12A of the substation 12 lock the relay. Due to this, the relay is not used. At this time, the relay devices 11 </ b> A and 12 </ b> A send to the management center 20 a relay operation state signal indicating that the relay device 11 </ b> A, 12 </ b> A has no failure but indicates that the relay is not used. When the analyzer 13 detects fading, the analyzer 13 sends a detection signal indicating the occurrence of fading and reception level data indicating the reception level of the micro line to the management center 20.

  When the management center 20 receives the relay operation state signal from the relay device 11A of the substation 11 and the relay device 12A of the substation 12, and receives the detection signal and the reception level data from the analyzer 13, the management center 20 uses the reception level data of the micro line. Thus, the estimation process is performed to estimate the time when the probability of occurrence of fading becomes zero. Thereafter, the management center 20 has a zero probability of fading when the relay operation status signal is from the relay device 11A of the substation 11 and indicates that there is no failure in the relay alone. A release signal is transmitted to the substation 11 when the time becomes, and the relay operation status signal is from the relay device 21A of the substation 12 and indicates that there is no failure in the relay alone. Transmits a release signal to the substation 12 at a time when the probability of fading is zero.

  When the relay device 11A of the substation 11 and the relay device 12A of the substation 12 receive the release signal from the processing device 21, they respectively release the relay lock.

  Thus, according to this embodiment, even when fading occurs and the relay devices 11A and 12A of the substation 11 and the substation 12 are locked, the time when the probability of fading is zero is estimated. Then, the unlocking of the relay devices 11A and 12A can be automatically performed. As a result, it is possible to eliminate the need for an operator to go to the substation 11 or substation 12 where the relay devices 11A and 12A are installed to unlock the relay devices 11A and 12A.

  Further, according to this embodiment, the detection signal indicating the occurrence of fading generated by the analyzer 13 and the reception level data indicating the reception level of the micro line are effectively used, and the time when the probability of occurrence of fading becomes zero is obtained. Can be estimated.

In addition, according to this embodiment, the processing unit 21B divides the maximum occurrence time T _max by the data point interval T _DP set at the 30-minute interval, and is the smallest among the occurrence time intervals of fading occurring in each time zone. Since the occurrence time interval is extracted as the minimum time interval T _min , compared to the case where all occurrence time intervals are handled in the subsequent estimation processing, the number of data to be processed can be reduced and the burden on the processing unit 21B can be reduced.

  Further, according to this embodiment, since the linear regression equation is used to estimate the time when the probability of fading occurs, the time can be easily estimated.

  In this embodiment, a single micro line is described as an example. However, when the micro line relays and transmits data, a processing device 21 may be installed in each micro line. All the micro lines may be managed by one processing device 21.

(Embodiment 2)
A microcarrier relay system according to this embodiment is shown in FIG. In this microcarrier relay system, for example, both the power plant 31 and the substation 32 monitor the ultrahigh-voltage transmission line 2 installed between them. The power station 31 and the substation 32 perform data transmission via the relay stations 33 to 35 and perform data transmission with the central communication station 40, and the relay stations 33 to 35 perform data transmission with the central communication station 40. This microcarrier relay system is installed in relay (Ry) devices A31 ₁ , B31 ₁ , signal terminal devices A31 ₂ , B31 ₂ and radio devices A31 ₃ , B31 ₃ installed in a power plant 31, and in a substation 32. Relay (Ry) devices A32 ₁ , B32 ₁ , signal terminal devices A32 ₂ , B32 ₂ and radio devices A32 ₃ , B32 ₃ , radio devices A33 ₁ , A33 ₂ installed at the relay station 33, Radios B34 ₁ and B34 ₂ installed at the relay station 34, radios B35 ₁ and B35 ₂ installed at the relay station 35, a processing device 41 and a database 42 installed at the central communication station 40, It has.

In power plant 31, B lineage consisting of the system A relay comprising a relay device A31 ₁ and the signal terminal station device A31 ₂ and radio A31 ₃ Prefecture, relay device B31 ₁ and the signal terminal station device B31 ₂ and radio B31 ₃ Metropolitan Two relays are formed with the relay, and the power transmission line 2 is protected by the two relays. The relay device A31 ₁ for the A system relay and the relay device B31 _{1 for the} B system relay are connected to the central communication station 40 via a communication network (not shown). Similarly, the substation 32, from a system A relay comprising a relay device A32 ₁ and the signal terminal station device A32 ₂ and radio A32 ₃ Prefecture, relay device B32 ₁ and the signal terminal station device B32 ₂ and radio B32 ₃ Metropolitan A two-system relay is formed by the B-system relay, and the power transmission line 2 is protected by the two-system relay. The relay device B32 ₁ relay device A32 ₁ and B lineage relay of system A relay is connected to the central communication stations 40 interposed a communication network (not shown).

The relay station 33 relays between the A-system relay of the power plant 31 and the A-system relay of the substation 32 to form a transmission path using microwaves. The A-system relay of the power plant 31 is formed by a first micro circuit formed between the power plant 31 and the relay station 33 and a second micro circuit formed between the relay station 33 and the substation 32. And data transmission between the A system relay of the substation 32. The relay station 33 includes wireless devices A33 ₁ and A33 ₂ . The radio A33 ₁ performs data transmission with the A-system relay radio A31 ₃ of the power station 31, and the radio A33 ₂ performs data transmission with the A-system relay radio A32 ₃ of the substation 32. Since pass each other received data to the wireless device A33 ₁ and radio A33 _2, relay stations 33, first micro between the system A relay of system A relay and substation 32 of the plant 31 A transmission line composed of a line and a second micro line is formed.

The relay stations 34 and 35 relay between the B system relay of the power plant 31 and the B system relay of the substation 32 to form a transmission path using microwaves. A third micro circuit formed between the power station 31 and the relay station 34, a fourth micro circuit formed between the relay station 34 and the relay station 35, the relay station 35 and the substation 32; Data transmission is performed between the B system relay of the power plant 31 and the B system relay of the substation 32 by the fifth micro circuit formed between the two. The relay station 34 includes wireless devices B34 ₁ and B34 ₂ , and the relay station 35 includes wireless devices B35 ₁ and B35 ₂ . Radio B34 ₁ of relay stations 34 performs radio B31 ₃ and data transmission system B relay power plant 31, radio B34 ₂ performs radio B35 ₁ and data transmission relay stations 35. Further, the radio B35 ₂ of the relay station 35 performs data transmission with the radio B32 ₃ of the B system relay of the substation 32. Then, together delivers the received data to the wireless device B34 ₁ and radio B34 ₂ of relay stations 34, since the passes together the received data to the wireless device B35 ₁ and radio B35 ₂ of relay stations 35, relay stations Reference numerals 34 and 35 form a transmission path composed of a third micro line, a fourth micro line, and a fifth micro line between the B system relay of the power plant 31 and the B system relay of the substation 32.

A radio A33 ₁ and radio A33 ₂ of relay stations 33, the wireless device B34 ₁ and radio B34 ₂ of relay stations 34, the radio B35 ₁ and radio B35 ₂ of relay stations 35, each radio The level of the microwave received by the attached antennas A33 ₁₁ , A33 ₂₁ , B34 ₁₁ , B34 ₂₁ , B35 ₁₁ , B35 ₂₁ is checked to determine whether or not fading has occurred. Then, the radio A33 ₁ and radio A33 ₂ of relay stations 33, the wireless device B34 ₁ and radio B34 ₂ of relay stations 34, the radio B35 ₁ and radio B35 ₂ of relay stations 35, fading When occurrence is detected, a detection signal indicating the occurrence of fading and reception level data indicating the reception level of the micro line are respectively sent to the central communication station 40 via a communication network (not shown).

As described above, in the power plant 31, the relay system A31 ₁ , the signal terminal device A31 _2, and the radio device A31 ₃ form an A-system relay, and the relay device B31 ₁ , the signal terminal device B31 _2, and the wireless forming the B-type relay from aircraft B31 ₃ Prefecture.

The signal terminal device A31 ₂ of the power plant 31 is an interface that connects between the relay device A31 ₁ and the wireless device A31 ₃ , and the signal terminal device B31 ₂ is connected between the relay device B31 ₁ and the wireless device B31 _3. The interface to connect to.

The relay device A31 ₁ of the A-system relay of the power plant 31 detects its own electrical characteristics such as voltage, current and phase in the transmission line 2, and uses these as monitoring data to communicate with the signal terminal device A31 ₂ and wirelessly. It sends to the A system relay of the substation 32 which is the other end side via the machine A31 ₃ . The relay device A31 ₁ receives monitoring data from the A-system relay of the substation 32 via the radio device A31 ₃ and the signal terminal device A31 ₂ . And relay apparatus A31 ₁ determines the presence or absence of an accident etc. using the monitoring data of a self-end side, and the monitoring data of the other party end, and installs the circuit breaker (illustration omitted) installed in the power transmission line 1 Control according to the accident.

When the relay devices A31 ₁ and B31 ₁ do not receive the monitoring data from the substation 32 via the radio devices A31 ₃ and B31 ₃ for a predetermined time, the relay devices A31 ₁ and B31 ₁ are put into a relay non-use state by locking the relay. Then, the relay devices A31 ₁ and B31 ₁ send a relay operation state signal indicating that the relay is not used to the central communication station 40. This relay operation state signal includes a signal indicating whether or not the relay device 11A is out of order. Thereafter, when the relay device 11A receives the release signal from the central communication station 40, the relay device 11A uses the relay not used as a relay and releases the lock of the relay.

Radio A31 ₃ is a radio A32 ₃ and data transmission substation 32 by the first micro channel. Radio A31 _3, when via the signal terminal station device A31 ₂ receives the monitoring data from the relay device A31 _1, transmits this data from antenna A31 ₃₁ that comes by microwave. Further, when the antenna A31 ₃₁ outputs a high-frequency signal by receiving the microwave, radio A31 ₃ reproduces the monitoring data from the signal and sends it to the relay device A31 ₁ via the signal terminal station device A31 _2. That is, a microcarrier relay is formed by the relay device A31 ₁ , the signal terminal device A31 _2, and the radio device A31 ₃ . Also, radio A31 ₃ determines the presence or absence of the occurrence of fading, for example, to check the level of the microwave antenna A31 ₃₁ receives. When detecting the occurrence of fading, the wireless device A 31 ₃ sends a detection signal indicating the occurrence of fading and reception level data indicating the reception level of the micro line to the central communication station 40 via a communication network (not shown). send.

The relay device B31 ₁ , the signal terminal device B31 ₂ , the radio terminal B31 _3, and the antenna B31 ₃₁ constituting the B system relay of the power plant 31 are connected to the relay device A31 ₁ and the signal terminal constituting the A system relay of the power plant 31. is the same as the station apparatus A31 ₂ and radio A31 ₃ and the antenna A31 _31, description thereof is omitted. Further, the relay device A32 ₁ and the signal terminal station device A32 ₂ and radio A32 ₃ and the antenna A32 ₃₁ constituting the system A relay substation 32, and a relay device B32 ₁ constituting the B-type relay of the substation 32 the same applies to the signal terminal station device B32 ₂ radio B32 ₃ and antenna B32 _31.

  The processing device 41 of the central communication station 40 estimates a time when the occurrence probability of fading becomes zero, and includes a communication unit 41A, a processing unit 41B, an A-system relay transmission unit 41C, and a B-system relay transmission unit 41D. ing.

The communication unit 41A includes a radio unit A31 ₃ and a radio unit B31 ₃ of the power plant 31, a radio unit A32 ₃ and a radio unit B32 _{3 of} the substation 32, a radio unit A33 ₁ and a radio unit A33 _{2 of} the relay station 33, and a relay station 34. the via radio B34 ₁ and radio B34 _2, and the relay stations 35 radio B35 ₁ and radio B35 ₂ and communication network (not shown) performs data transmission, received from the communication network, each micro A signal and data including a line detection signal and reception level data are sent to the processing unit 41B.

When the processing unit 41B receives the detection signal and the reception level data of each micro line from the communication unit 41A, the processing unit 41B performs the same estimation process as the processing unit 21B of the first embodiment based on the reception level data of each micro line. The time when the probability of occurrence of fading becomes zero is estimated. Further, the processing unit 41B records data including the maximum occurrence time T _max obtained by performing the pre-data storage process in step S1 of FIG. 2 in the database 42 for each micro line.

The A-system relay transmission unit 41C has the same configuration as the output unit 21C and the signal transmission device 22 of the first embodiment, and the B-system relay transmission unit 41D is the same as the output unit 21C and the signal transmission device 23 of the first embodiment. It is the composition. That is, in the A-system relay transmission unit 41C, the relay operation state signal from the communication unit 41A indicates that there is no failure in the relay device A31 _{1 at} the power plant 31, and indicates that there is no failure in the relay device A32 _{1 at} the substation 32. In this case, when the release signal is received from the processing unit 41B, this signal is transmitted to the relay device A31 ₁ of the power plant 31 and the relay device A32 ₁ of the substation 32 via a communication network (not shown). Similarly, B relays the transmission unit 41D includes a relay operation state signal from the communication unit 41A indicates no failure of the relay device B31 ₁ power plant 31, indicates the absence failure of the relay device B32 ₁ substation 32 In some cases, when a release signal is received from the processing unit 41B, this signal is transmitted to the relay device B31 ₁ of the power plant 31 and the relay device B32 ₁ of the substation 32 via a communication network (not shown).

Thus, according to this embodiment, even if fading occurs and the relay devices A31 ₁ , B31 _{1 of the} power plant 31 and the relay devices A32 ₁ , B32 _{1 of the} substation 32 are locked, fading on each micro line Is estimated, and when this time is reached, the relay devices A31 ₁ and B31 _{1 of the} power plant 31 and the relay devices A32 ₁ and B32 ₁ of the substation 32 are automatically unlocked. be able to.

As described above, the first and second embodiments of the present invention have been described in detail. However, the specific configuration is not limited to each embodiment, and there are design changes and the like within the scope not departing from the gist of the present invention. Are also included in the present invention. For example, in the first and second embodiments, the microwave transmission path between the substations is taken as an example, but the present invention is naturally applied to the microwave transmission path between the substations. Is possible. In each embodiment, the minimum occurrence time interval among the occurrence time intervals of fading occurring in each time zone is extracted as the minimum time interval T _min and used in the subsequent estimation processing. It is also possible to perform the subsequent estimation process using all of.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the microcarrier relay system by Embodiment 1 of this invention. It is a flowchart which shows the estimation process by a process part. It is a figure which shows fading generation | occurrence | production time interval data. It is a figure which shows the specific example of generation | occurrence | production of fading. It is a figure which shows the specific example of fading generation | occurrence | production time interval data based on FIG. It is a figure which shows fading generation | occurrence | production time interval data based on absolute time. It is a figure which shows the specific example of fading generation | occurrence | production time interval data based on absolute time. It is a figure which shows the minimum time interval data. It is a figure which shows the specific example of minimum time interval data. It is a figure which shows the specific example of the minimum reception level and generation | occurrence | production time interval. It is the figure which represented FIG. 10 with the graph. It is a figure which shows the specific example of the relationship between the data point of minimum time interval data DA3, and the minimum time interval. It is a figure which shows the relationship between a short-term moving average and a long-term moving average. It is a figure which shows the specific example of the data containing absolute time and generation | occurrence | production time interval. It is a figure which shows the analysis data by regression analysis. It is a graph showing the regression type based on the specific example of FIG. It is a block diagram which shows the microcarrier relay system by Embodiment 2 of this invention.

Explanation of symbols

1,2 transmission lines 11 and 12 substations 11A, 12A relay device 11B, 12B radios 11C, 12C signal terminal apparatus 11B _1, 12B ₁ antenna 13 analyzer (detector)
20 management center 21 processing device (estimating means)
21A Communication unit 21B Processing unit 21C Output unit 22, 23 Signal transmission device (output means)
22A, 23A Relay operation output unit 22B, 23B Gate 22C, 23C Communication unit 31 Power plant A31 ₁ , B31 ₁ Relay device A31 ₂ , B31 ₂ Signal terminal device A31 ₃ , B31 ₃ Radio (detection means)
A31 _31, B31 ₃₁ antenna 32 substation A32 _1, B32 ₁ relay device A32 _2, B32 ₂ signal terminal station device A32 _3, B32 ₃ radios (detecting means)
A32 _31, B32 ₃₁ antenna 33-35 relay stations A33 _1, A33 ₂ radios A33 _11, A33 ₂₁ antenna B34 _1, B34 ₂ radios 40 central communication stations 41 processing unit (estimating means)
41A communication unit 41B processing unit 41C A-system relay transmission unit (output means)
41D B relay transmission unit (output means)
42 Database

Claims (6)

In a microcarrier relay system in which a relay device installed for protection of a power system transmits monitoring data of the power system to each other by microwaves,
Detection means for detecting the occurrence of fading;
When the detection means detects fading, the transition of the time interval at which fading occurs between the occurrence of the first fading and the elapse of a preset measurement time is taken as time series data, and this time series data is An estimation means for estimating the time when fading ends based on;
When the relay device is in a locked state because the relay device does not receive a signal from the counterpart relay device and the relay device is not out of order, when the ending time estimated by the estimating means is reached, the relay device An output means for outputting a release signal;
And the relay device releases the locked state when receiving a release signal from the output means.   The estimation means accumulates the occurrence time from the occurrence of fading to the end, and when the occurrence time is longer than the previous time, updates the previous maximum occurrence time with the current occurrence time as the maximum occurrence time, and finally The microcarrier relay system according to claim 1, wherein the updated maximum occurrence time is used as a fading measurement time.   Based on the detection result of the detection means, the estimation means calculates time interval data of fading adjacent to each other to obtain time series data, and from the transition of the time interval of occurrence of adjacent fading represented by the time series data The microcarrier relay system according to claim 1, wherein a time at which fading ends is estimated.   The estimating means calculates time intervals of fading adjacent to each other based on the detection result of the detecting means to obtain time-series data, and divides the time-series data at predetermined time intervals, respectively. Extracting the minimum occurrence time interval from the occurrence time intervals as the minimum occurrence time interval to obtain time series data, and estimating the time when fading ends from the transition of the minimum occurrence time interval represented by this time series data The microcarrier relay system according to claim 1 or 2.   5. The microcarrier relay system according to claim 3, wherein the estimation unit generates a regression equation by regression analysis of the time series data, and estimates a time at which fading ends using the regression equation. . In the automatic return method of the microcarrier relay in which the relay device installed for protection of the power system transmits the monitoring data of the power system to each other by microwaves,
When fading is detected, the transition of the occurrence time interval where fading occurs between the first fading occurrence and the measurement time elapse is used as time series data,
Estimate the time when fading ends based on this time series data,
When the relay device is in a locked state because it does not receive a signal from the counterpart relay device and the relay device is not out of order, a release signal is output to the relay device when the estimated fading time is reached And
When the relay device receives a release signal from the output means, the locked state is released.
A method for automatically returning a microcarrier relay.

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