JPS6238938B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a line switch remote monitoring system for remotely monitoring segmentation and interconnection switches scattered on high-voltage distribution lines by means of distribution line transportation. .

[Prior art]

In general, signal transmission through distribution lines cannot achieve high transmission speeds due to transmission band restrictions and noise effects, and high-voltage distribution line segmentation and interconnection switches (hereinafter referred to as switches) is operated only in the event of an accident or planned construction, and the frequency of operation is very small. Therefore, the status of the switch is monitored by monitoring the status of the switch constantly, rather than by cyclic polling from the central side. It is effective to use a calling method that uses automatic transmission from the side, and to use it in combination with a polling method only when necessary.

FIG. 1 shows a conceptual diagram of remote monitoring of switches using a distribution line conveyance system in which the metal circuit of a high-voltage distribution line is used as a signal transmission path. When transmitting signals using the metal circuits of high-voltage distribution lines, the power supply end has the lowest impedance, so the carrier signal from the power supply end to the load side is the voltage signal, and the carrier signal from the load side to the power supply end is the voltage signal. Generally, a current signal is used as the signal.

In the figure, 1 is a main distribution transformer, 2 is a feeder switch, 3 is a feeder current transformer, 4 is a high voltage bus, 5 is a high voltage distribution line, 6a to 6h are switches, 7 is a main unit, Reference numerals 8a to 8h are slave units linked to the switches 6a to 6h, respectively.

For example, when the switch 6a is operated on-site and the state changes, a calling signal is sent from the slave unit 8a to the high-voltage distribution line 5, received by the base unit 7 via the feeder current transformer 3, A change in state of the switch 6a is monitored.

However, since the transmission quality of the distribution line carrier method is not sufficiently high, there may be cases where the base unit 7 cannot normally receive the calling signal.

Against the above background, conventionally, the base unit shown in Figure 2 and the slave unit shown in Figure 3 have been able to locate the slave unit that sent the calling signal and detect the status change using the procedure example shown in Figure 4. I was watching.

In FIG. 2, 9 is a receiving circuit that receives carrier signals from slave units 8a to 8h via feeder current transformer 3, and 10 is a receiving circuit that detects the contents of address information and switch status information included in the received signal. Received content detection circuit, 11 is a control circuit that controls all operations of the base unit 7, and 12 is a switch status memory circuit that stores all the latest switch statuses sent from each slave unit 8a to 8h. , 13 is a comparison/determination circuit that compares the received state of a certain switch with the state stored in the switch state storage circuit 12 of the switch and determines a change, and 14 is a circuit where the need for switch state monitoring has arisen. 15 is a transmission circuit for injecting the individual monitoring signal into the high-voltage bus 4.

In FIG. 3, 16 is a receiving circuit that receives a polling signal from the base device 7, 17 is an individual monitoring signal detection circuit that detects that the received polling signal is an individual monitoring signal that corresponds to the own device, and 18 is a slave device. A control circuit that controls all operations of the machines 8a to 8h, 19 a switch state reading circuit that reads the switch state, 20 a switch state memory circuit that stores the switch state, and 21 a switch state memory circuit. A state change determination circuit that compares the state stored in 20 with the latest state read in the switch state reading circuit 19 to determine a change; A transmission signal generation circuit 23 generates a transmission signal to be transmitted as a calling signal when there is a state change in the high voltage distribution line 5.
It is a transmitting circuit that injects into

FIG. 4 is a time chart showing an example of the procedure for the base unit 7 to complete monitoring when there is a change in the status of the switch; is a transmission/reception time chart of the handset 8d when there is a state change in the switch 6d, and this figure is a transmission/reception time chart of the handset 8g when there is a state change in the switch 6g. Further, in the figure, C is a calling signal, PM is an individual monitoring signal, and AB is a reply signal.

Next, the operation will be explained based on the time chart shown in FIG.

The initial state of each switch 6a to 6h is the switch 6a
-6f is in the closed state, and the switches 6g and 6h are in the open state. First, when the switch 6d changes from the closed state to the open state, the state change detection circuit 21 of the slave device 8d detects the state change. and control circuit 1
The transmission of the calling signal C is commanded from 8 (the 4th
), the calling signal C generated by the transmission signal generation circuit 22 is sent from the transmission circuit 23 to the high voltage distribution line 5. This signal is received by the receiving circuit 9 of the base unit 7 via the feeder current transformer 3 (Fig. 4), and the received content detection circuit 10 detects that it is the calling signal C from the slave unit 8d, and converts it into a signal. The included address and contents of the switch status are compared with the contents stored in the switch status storage circuit 12 and the determination circuit 1
3, and after confirming that there is a change, the data is sent to the control circuit 11. These contents are updated and stored in the switch state storage circuit 12, and the predetermined monitoring operation is completed.

Next, when the switch 6g changes from the open state to the closed state, a calling signal C is similarly transmitted from the handset 8g (FIG. 4). If the base unit 7 cannot normally receive this signal, the reception content detection circuit 10 notifies the control circuit 11 of the reception failure (FIG. 4). In response to this poor reception, the control circuit 11 activates the individual monitoring signal generation circuit 14 in order to individually monitor each slave unit 8a to 8g in sequence. The individual monitoring signal generation circuit 14 first generates a polling signal PM for individually monitoring the handset 8a, and sends it to the transmission circuit 15.
It is sent to the high voltage bus 4 via. In the handset 8a,
This polling signal PM is received by the reception circuit 16, detected by the individual monitoring signal detection circuit 17, and transmitted to the control circuit 18. The control circuit 18 generates a reply signal using the transmission signal generation circuit 22 in response to this individual monitoring request.
AB is generated and sent to the high voltage distribution line 5 via the transmission circuit 23. This reply signal AB is received by the base unit 7, and the individual monitoring of the slave unit 8a is completed. Subsequently, the base unit 7 sequentially performs similar individual monitoring on the slave units 8b to 8h, and completes the relief process for poor reception of the calling signal C (FIG. 4).
If a transmission failure occurs during individual monitoring processing, the predetermined individual monitoring is performed without fail by repeating polling of the child device.

Conventional switch remote monitoring was performed using the method described above, so if poor reception occurs in the calling signal due to a change in switch status, the switch status is monitored and confirmed for all slave units. If there are many switches, it takes a lot of time to locate the handset and detect a change in status.

[Summary of the invention]

This invention was made in order to eliminate the drawbacks of the conventional system as described above.The handset is grouped, and when poor reception of the calling signal occurs, polling is performed for each group. An object of the present invention is to provide a remote control system for track switches that can locate a slave unit in a short time by receiving a reply only from the slave unit that first sent a calling signal. It is said that

[Embodiments of the invention]

An embodiment of the present invention will be described below.
5 and 6 are block diagrams showing the configurations of a master unit and a slave unit in an example of the railway switch remote monitoring system according to the present invention, and the same parts as in FIGS. Reference numerals are given and explanations are omitted.

In FIG. 5, 24 is a group monitoring signal generation circuit that generates a group monitoring signal to be transmitted when reception of a calling signal fails, and 25 is a calling content temporary storage circuit that temporarily stores the content contained in the calling signal. be.

In Fig. 6, 26 is a group monitoring signal detection circuit that detects whether the group monitoring signal sent from the base unit 7 corresponds to the own unit, and 27 is a circuit that sends a calling signal when there is a change in the status of the switch. This is a calling signal transmission storage circuit that sets a flag to remember that the calling signal has been sent when the calling signal is sent.

FIG. 7 is a time chart showing an example of the procedure for the base unit 7 to complete monitoring when there is a change in the status of the switch; is a transmission/reception time chart of the handset 8d when there is a change in the status of the switch 6d, and this figure is a transmission/reception time chart of the handset 8g when there is a change in the status of the switch 6g. GM is a group monitoring signal.

Next, the operation will be explained based on the time chart shown in FIG.

The initial state of each switch 6a to 6h is the switch 6a
~6f is in the closed state, switches 6g and 6h are in the open state, and switches 6a, 6b and 6g (slave units 8a, 8b and 8g) are in the A group, switches 6c, 6d and 6h (slave units 8c) , 8d and 8
h) is group B, and switches 6e and 6f (slave units 8e and 8f) are group C. First, when switch 6d changes from closed to open, the status change detection circuit of the corresponding slave unit 8d At 21,
A state change is detected, and the control circuit 18 instructs the transmission of the calling signal C (FIG. 7). Calling signal C generated by transmission signal generation circuit 22
At the same time that the signal C is sent from the transmission circuit 23 to the high-voltage distribution line 5, a flag is set in the calling signal transmission storage circuit 27 to memorize that the calling signal C has been sent.

This signal C is received by the receiving circuit 9 of the base unit 7 via the feeder current transformer 3 (Fig. 7), and the received content detection circuit 10 detects that it is the calling signal C from the slave unit 8d, and the address is and the contents of the switch status are stored in the calling contents temporary storage circuit 25 via the control circuit 11. At the same time, the control circuit 11 issues a command to the individual supervisory signal generation circuit 14 to transmit the individual supervisory signal PM to the handset 8d for the purpose of confirmation. The individual monitoring signal PM generated in response to this command is sent to the high voltage bus 4 via the transmission circuit 15 (FIG. 7). This individual monitoring signal PM is received by the handset 8d (Fig. 7),
It is detected by the individual monitoring signal detection circuit 17 and passed to the control circuit 18. The control circuit 18 sends a reset signal to the calling signal transmission storage circuit 27 to lower the flag, and also sends a reset signal to the calling signal transmission storage circuit 27 to lower the flag.
The response signal AB is sent out via the transmission circuit 23 (FIG. 7). The base unit 7 receives this reply signal AB (FIG. 7), detects it with the received content detection circuit 10, and compares and discriminates this detected content with the content sent earlier and stored in the calling content temporary storage circuit 25. When the comparison is made in the circuit 13 and it is confirmed that they match, the contents are updated and stored in the switch state storage circuit 12 via the control circuit 11, and the predetermined monitoring operation is completed.

Next, when the switch 6g changes from the open state to the closed state, the calling signal C is similarly transmitted from the handset 8g (FIG. 7). If the base unit 7 cannot normally receive this signal C, the reception content detection circuit 10 notifies the control circuit 11 of the reception failure (FIG. 7).

In response to this poor reception, the control circuit 11 activates the group monitoring signal generation circuit 24 for group monitoring.
The group monitoring signal generating circuit 24 first generates a polling signal GM for group monitoring the A group, and sends it to the high voltage bus 4 via the transmitting circuit 15 (FIG. 7). The handsets 8a, 8b, and 8g that belong to Group A receive this group monitoring signal GM (Fig. 7), and detect in the group monitoring signal detection circuit 26 that it is the group monitoring signal of Group A to which the own machine belongs. However, the control circuit 18 issues a command to the transmission signal generation circuit 22 so that only the handset 8g whose flag is set in the calling signal transmission storage circuit 27 sends a reply. With this command, the reply signal AB is sent to the slave unit 8g.
The main unit 7 receives this. The control circuit 11 determines that the previous calling signal C was a signal from the handset 8g, stores the received content in the calling content temporary storage circuit 25, and at the same time sends an individual monitoring signal to the handset 8g for confirmation.
Individual monitoring signal generation circuit 1 to transmit PM
Command to 4. In response to this directive, individual monitoring signals
The PM is sent to slave unit 8g (Figure 7).

In the handset 8g, upon receiving this individual monitoring signal PM (FIG. 7), the calling signal transmission storage circuit 27 lowers the flag, and the reply signal AB is transmitted. Base unit 7 receives this reply signal AB (Fig. 7),
This received content and calling content temporary storage circuit 25
After confirming in the comparison/discrimination circuit 13 that the stored contents match, the above-mentioned contents are updated and stored in the switch state storage circuit 12. Next, the group monitoring signal GM is sent to groups B and C in sequence.
is sent, but there is no reply signal, so
This is completed (Figure 7).

In addition, although the above-mentioned embodiment shows a remote monitoring system for the switch, a remote control function may be combined with this, and furthermore, the distribution line transportation can be applied not only to the metal circuit system but also to the ground return system. is obvious.

〔Effect of the invention〕

As described above, according to the present invention, the handset that has transmitted the calling signal sets a flag and remembers the fact, and if the base unit fails to receive the calling signal, it sends a group monitoring signal for each group of handsets. Since the configuration is configured such that the slave unit can be located by transmitting the information, it is possible to improve the reliability and speed up the remote monitoring of the switch by using the distribution line, which has a somewhat inferior transmission quality.

[Brief explanation of the drawing]

Figure 1 is a conceptual diagram of remote monitoring of track switches using the distribution line carrier method, Figure 2 is a block diagram showing the configuration of the base unit in the conventional remote monitoring system of track switches, and Figure 3 is a diagram showing the configuration of the main unit in the conventional method. FIG. 4 is a time chart showing the operation of the conventional system; FIG. 5 is a block diagram showing the configuration of the main unit in an example of the railway switch remote monitoring system according to the present invention; FIG. 6 is a block diagram showing the configuration of the handset according to the system of the present invention, and FIG. 7 is a time chart showing the operation of the present invention. 1...Distribution main transformer, 2...Feeder switch, 3...Feeder current transformer, 4...High voltage bus, 6
a~6h...Switch, 7...Main unit, 8a~8h...
...Slave device, 9...Receiving circuit, 10...Received content detection circuit, 11, 18...Control circuit, 12...Switch condition storage circuit, 13...Comparison/discrimination circuit, 14...
Individual monitoring signal generation circuit, 15... Transmission circuit, 16
...Receiving circuit, 17...Individual monitoring signal detection circuit,
19...Switch state reading circuit, 20...Switch state storage circuit, 21...Status change determination circuit, 22...
...Transmission signal generation circuit, 23... Transmission circuit, 24...
...Group monitoring signal generation circuit, 25...Calling content temporary storage circuit, 26...Group monitoring signal detection circuit, 2
7...Calling signal transmission storage circuit. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1 Consists of a master unit installed at a distribution substation and slave units installed near each of the track switches scattered in the high-voltage distribution system that supplies power from the distribution substation, and opens and closes using distribution line transportation. In a track switch monitoring system that remotely monitors the status of a track switch, when a calling signal is received from the slave unit due to a change in the status of the line switch, the slave unit is called and the status of the switch is monitored. Means for transmitting an individual monitoring signal requesting a reply and a group monitoring signal for collectively calling grouped handsets in groups and requesting a reply only from the handsets that have transmitted the calling signal. Attached to the base unit, when it detects a change in the status of the track switch and sends a calling signal, it sets a flag, receives an individual monitoring signal for the slave unit from the base unit, lowers the flag, and sends the flag. and a means for receiving a group monitoring signal from the base unit and sending a reply only when the flag is set, so that when the base unit can normally receive the calling signal, the calling signal is sent. Sends an individual monitoring signal to the slave device that sent it, causes the slave device to lower its flag and reply, and upon receiving the reply signal,
If the prescribed monitoring process is completed and the calling signal fails to be received, the group monitoring signal for each group of handsets is sequentially transmitted to locate the handset that sent the calling signal, and then the above-mentioned A remote monitoring system for a track switch, characterized in that it is configured to complete a predetermined monitoring by performing individual monitoring similar to that in the case of normal reception.