JP2010166332A - Remote supervisory control system and protection switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To convert an all-purpose slave station device which is operated based on an HDLC into two series in a remote supervisory control system. <P>SOLUTION: In this remote supervisory control system 1, a master station device 2 sends a control signal of an apparatus 8 and receives a state signal of the apparatus 8. A dummy master station device 3 carries out a communication test with a standby series device at that point in time of a one series ITC 5 and a two series ITC 6. For example, the device 3 sends a dummy control signal and receives a dummy state signal. A protection switch 4 is a device which switches connection between the master station device and the slave station device, and there is the case where the master station device 2 is connected to the one series ITC 5 and the dummy master station device 3 is connected to the two series ITC 6, and the case where the master station device 2 is connected to the two series ITC 6 and the dummy master station device 3 is connected to the one series ITC 5. In the one series ITC 5 and the two series ITC 6, at that point in time, a normal series device receives a control signal, sends a control command corresponding to the control signal to the apparatus 8, also carries out a display input, etc. from the apparatus 8, and sends a state signal corresponding to the input. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a remote monitoring and control system in which data transmission between a master station device and two-line slave station devices is operated based on HDLC (High-Level Data Link Control).

  Conventionally, remote monitoring and control devices (TC: TeleControl) installed at important bases and remote islands are operated using the cyclic transmission method, which limits the communication procedure with the master station device installed at the control center. When the TC breaks down without being received, the master station side can easily switch to the sound side TC (standby system).

  In recent years, a new remote monitoring and control apparatus (ITC: Intelligent TeleControl) newly adopted for replacement with the passage of time is operated based on HDLC. As a result, it is possible to realize high functionality, high speed and large capacity, improved maintainability, high reliability and compactness of the remote monitoring and control device. However, when operating with HLDC, the communication procedure with the master station apparatus is defined, and it is necessary to always communicate one-to-one.

  Therefore, in order to cope with HDLC operation, a duplex remote monitoring and control device that realizes duplexing of transmission functions with simple means and enables multi-item mass transmission, high-speed transmission, and high-efficiency transmission has been proposed (patent) Reference 1). Further, a remote monitoring control system has been proposed in which a switching unit is provided in a master station and a slave station, and a remote control device that is duplicated ensures an information transmission function even if a line abnormality occurs (see Patent Document 2).

JP-A-5-56482 JP-A-9-247766

However, the above prior art has the following problems.
With respect to the dual remote monitoring and control apparatus disclosed in Patent Document 1, it is necessary to connect a master station and a slave station via a transmission line via a modem, and a single remote monitoring and control apparatus like the ITC currently employed. In contrast, when the communication line is duplicated, the transmission line of 4 lines is required for 2 devices, so it is difficult to adopt it in a place where it is difficult to secure the communication line on a remote island or the like. Further, when viewed from the monitoring control program operating in the master station device, the slave station device is recognized as two electric stations, so the business cost for table correction and the like increases significantly.

In addition, regarding the remote monitoring control system of Patent Document 2, since the transmission control unit on the slave (slave station) side is not always communicating in an open state, the soundness of the standby system cannot be ensured.
Furthermore, regarding both Patent Documents 1 and 2, it is difficult to realize by applying a general-purpose ITC that does not have a duplex interface between ITCs (slave station devices).

  The present invention has been made in view of the above problems, and a main object thereof is to make two series of general-purpose slave station devices operated based on HDLC in a remote monitoring control system.

  In order to solve the above-mentioned problems, the present invention is a remote monitoring and control system that detects a state of a device in a remote place, detects the state of the device, and notifies the parent station device A line switching device for switching a line connecting the first slave station device and the second slave station device, the master station device, and the first slave station device and the second slave station device; The master station device transmits a control signal for requesting the status data of the device to the line switching device and receives a status signal including the status data of the device from the line switching device; The master station device is connected to a regular slave station device among the first slave station device and the second slave station device, and the control signal from the master station device is connected to the regular system. Before passing from the slave station device of the regular system. When the status signal is passed to the master station device and a line switching instruction is received, the master station device is connected to a standby slave station device, and the control signal from the master station device is The status signal from the standby slave station device is passed to the master station device, and the first slave station device and the second slave station device are connected to the line switching device. When the control signal is received from, the state of the device is detected, the state signal is generated according to the state of the device, and the state signal is transmitted to the line switching device.

  According to this configuration, when the transmission method between the master station device and the slave station device is changed from cyclic to HDLC in the remote monitoring control system in which the slave station devices are made into two series, the existing master station device The remodeling only requires HDLC, and from the monitoring control program running on the master station device, it looks like a normal slave station device, so the existing system configuration information and screen table can be used as they are. . The slave station device needs to be a new HDLC device, but since the communication switching between the master station device and the two slave station devices is performed by the line switching device, there is no need to provide a duplex interface, etc. The device can be applied. According to the above, it is possible to realize HDLC operation at low cost without reducing reliability.

Further, the present invention is a remote monitoring control system, further comprising a simulated master station device that performs communication confirmation of the standby slave station device, wherein the simulated master station device uses the control signal used for communication confirmation. A simulated control signal is transmitted to the line switching device, and a simulated status signal that is the status signal used for communication confirmation is received from the line switching device, and the line switching device includes the simulated master station device, the Connected to a standby slave station device, and passes the simulation control signal from the simulated master station device to the standby slave station device, and the simulated status signal from the standby slave station device When the instruction to switch the line is received through the simulated master station device, the simulated master station device is connected to the regular slave station device, and the simulated control signal from the simulated master station device is connected. Communicate to the regular slave station In addition, the simulation state signal from the normal-use slave station device is passed to the simulated master station device, and the first slave station device and the second slave station device transmit the simulated control signal from the line switching device. Is received, the simulated state signal is transmitted to the line switching device without detecting the state of the device.
According to this configuration, the standby slave station device can confirm the soundness of its own device by transmitting and receiving the simulated control signal and the simulated state signal to and from the simulated master station device.

Further, the present invention is a remote monitoring control system, wherein when the line switching device receives the line switching instruction, the power reset of the first slave station device and the second slave station device is performed. It is characterized by performing.
According to this configuration, when the slave station device is switched from the active system to the standby system, the power supply is reset so that the initial setting and time synchronization are performed according to the newly communicating master station device, so that a normal link can be established. Become. In addition, early recovery can be attempted by restarting the defective device (ordinary system).

  The present invention also relates to a remote monitoring control system, wherein the line switching device receives a manual switching instruction when a failure of a normal slave station device is detected. Or when receiving a switching instruction by remote control.

  The present invention includes a line switching device. In addition, the problems disclosed in the present application and the solutions thereof will be clarified by the column of the best mode for carrying out the invention and the drawings.

  According to the present invention, in a remote monitoring control system, general-purpose slave station devices operated based on HDLC can be made into two series.

It is a figure which shows the structure of the remote monitoring control system 1, and 1 type | system | group ITC5 shows a connection system of a normal system, and 2nd system ITC6 shows a standby system. It is a figure which shows the structure of the remote monitoring control system 1, 1 system ITC5 shows a standby system, and 2 system ITC6 shows a normal system connection structure.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. A remote monitoring control system according to an embodiment of the present invention includes a line switching device provided between a master station device, a regular slave station device, and a standby slave station device. This enables communication between the master station device and the standby slave station device when the slave station device is switched due to failure detection of the normal system device. Then, a simulated master station device is provided in the line switching device, and a communication test is performed with the standby slave station device.

  According to this, general-purpose slave station devices that support HDLC but do not have a duplex interface can be duplexed.

≪System configuration and overview≫
FIG. 1 is a diagram showing the configuration of the remote monitoring control system 1. In the remote monitoring and control system, as a basic operation, a master station device running a remote monitoring program transmits a control signal to a slave station device via a communication line, and the slave station device receives a control signal from the master station device. In response to the control signal, various data are input from the device to be monitored, and a status signal based on the data is transmitted to the master station device.

  As shown in FIG. 1, the remote monitoring control system 1 includes a master station device 2, a simulated master station device 3, a line switching device 4, a 1 system ITC 5, a 2 system ITC 6, a DC power supply panel 7, and a device 8. The master station device 2, the 1 system ITC 5 and the 2 system ITC 6 are connected to the line switching device 4 so as to be communicable. The simulated master station device 3 is externally attached or built in the line switching device 4. The 1-system ITC 5 and the 2-system ITC 6 are connected to the DC power supply panel 7 via the line switching device 4 and selectively connected to the device 8.

  The master station device 2 is a device that is installed at a control station and monitors a device 8 at a remote location by running a remote monitoring program, and transmits a control signal for the device 8 to the line switching device 4. The status signal of the device 8 is received from the line switching device 4, and various processes are performed according to the information included in the status signal (for example, in the case of accident information, analysis of the accident situation, display of messages and device status, printing, etc. Process). The master station device 2 is composed of two devices, an A system DX (Data exchange) 2a and a B system DX 2b. The A system DX 2a is connected to the line switching device 4 through the A route, and the B system DX 2b is connected to the line switching device 4 through the B route.

  The simulated master station device 3 is a test device that performs a communication test with the slave station device in order to confirm the soundness of the slave station device. Among the 1-system ITC5 and the 2-system ITC6, the simulated master station apparatus 3 becomes a standby system at that time. Communicate with the device that is on. For example, a dummy control signal (simulated control signal) is periodically transmitted, and reception of a dummy status signal (simulated control signal) as a response is awaited. If not received within a predetermined time, a warning message is displayed. .

  The line switching device 4 is a device that switches the connection between the master station device 2 and the simulated master station device 3, and the 1-system ITC 5 and the 2-system ITC 6, and there are two types of connection. One is a case where the master station device 2 and the first system ITC 5 are connected, and the simulated master station device 3 and the second system ITC 6 are connected (see FIG. 1). The other is a case where the master station device 2 and the second system ITC 6 are connected and the simulated master station device 3 and the first system ITC 5 are connected (see FIG. 2). Then, the line switching device 4 receives the control signal from the master station device 2, transmits the control signal to the 1-system ITC 5 or the 2-system ITC 6 which is the normal system at that time, and responds with the 1-system ITC 5 or 2 system as a response. A status signal is received from the ITC 6, and the status signal is transmitted to the master station device 2. Further, the line switching device 4 receives a dummy control signal from the simulated master station device 2 and transmits a dummy control signal to the 1-system ITC 5 or the 2-system ITC 6 that is the standby system at that time, and 1 as a response to it. A dummy status signal is received from the system ITC 5 or the system 2 ITC 6, and the dummy status signal is transmitted to the master station device 2.

  The 1-system ITC 5 and the 2-system ITC 6 are slave station devices that are installed in an electric station and directly monitor and control the device 8. The control signal is received from the control signal, and a control command corresponding to the control signal is transmitted to the device 8, and as a response, the display input from the device 8 and the digital quantity input (for example, binary-coded decimal (BCD: Binary-Coded Decimal)) ) And analog quantity input (for example, display / measurement information input), and a status signal corresponding to the input is transmitted to the line switching device 4. For example, a change in the state of the device 8 is detected by an input from the device 8, device information is generated and edited by reflecting a plurality of accident information and the like, is loaded on the state signal, and is transmitted to the line switching device 4. In this state signal, only variable length information and state-related information at the time of state change are transmitted by HDLC, so that the amount of information can be flexibly dealt with. At this time, the standby slave station device receives a dummy control signal for the communication test from the simulated master station device 3, but since control to the device 8 is not possible, a dummy response signal is sent as a response. Send a status signal.

  The DC power supply panel 7 is connected to the 1-system ITC 5 and the 2-system ITC 6 via the switch SW 10 of the line switching device 4 and supplies power.

  The device 8 is a device to be monitored (for example, a switchboard, a circuit breaker, a disconnector control circuit, a numerical control device, or the like). Alternatively, a control circuit (not shown) is connected to the 2-system ITC 6, and the device 8 can be controlled from the service-system slave station device. In addition, a display / measurement circuit (not shown) is always connected to the 1-system ITC 5 and the 2-system ITC 6, and the status of the device 8 can be input to the active and standby slave station devices.

≪Configuration of line switching device≫
Next, the configuration of the line switching device 4 will be described with reference to FIG. The line switching device 4 includes signal branching devices H1 to H8, switches SW1 to SW10, and 16 communication lines that connect the signal branching devices H1 to H8 and the switches SW1 to SW8. The signal branching devices H1 to 8 are connected to the external master station device 2, the simulated master station device 3, the 1-system ITC5 or the 2-system ITC6, and are connected to any two of the internal switches SW1 to SW8 through a communication line. Is done. Then, control signals and status signals from external devices are passed through the two switches. For example, the signal branching device H1 passes the status signal coming from the 1-system ITC 5 through the 1-system A route to the switches SW5 and SW7. Further, the signal branching device H5 passes the control signal coming from the A system DX2a through the A route to the switches SW1 and SW3. The same applies to the other signal branching devices H2-4 and H6-8.

  The switches SW1 to SW8 are connected to the external master station device 2, the simulated master station device 3, the 1-system ITC5 or the 2-system ITC6, and connected to any two of the internal signal branching apparatuses H1 to 8 by communication lines. However, at a certain point in time, one signal branching device is connected out of the two by switching. Then, control signals and status signals are passed from the signal branching device connected at that time to an external device. For example, in FIG. 1, the switch SW1 passes a control signal from the signal branching device H5 to the 1-system ITC 5 through the 1-system A route. The switch SW5 passes a state signal from the signal branching device H1 to the A system DX2a through the A route. The same applies to the other switches SW2 to SW4 and SW6 to SW8.

  The switch SW9 is connected to a normal-use slave station device at that time of the 1-system ITC5 and the 2-system ITC6 by switching, and gives a line switching trigger by a failure signal from the slave station device. In addition, the line switching includes manual switching and switching by remote control such as a cyclic transmission method (CDT: Cyclic Data Transfer).

  The switch SW10 is provided between the 1-system ITC5 and the 2-system ITC6 and the DC power supply panel 7, and is normally closed, but is opened for several seconds when the line is switched. As a result, the power supply of the 1-system ITC 5 and the 2-system ITC 6 is reset.

  The switch SW11 is provided between the 1-system ITC 5 and the 2-system ITC 6 and the device 8, and is switched so that the normal-use slave station device and the device 8 can be controlled at that time.

  Although not shown, the line switching device 4 includes a control circuit that switches the switches SW1 to SW9 and SW11 in response to a line switching trigger from the switch SW9 or the like due to a failure signal. In addition, a plurality of devices 8 may be controllable with a regular slave station device.

≪System connection and switching≫
Next, connection and switching of the remote monitoring control system 1 will be described. Again, FIG. 1 shows a connection configuration in which the 1-system ITC 5 is a normal system and a 2-system ITC 6 is a standby system, and FIG.

  In FIG. 1, the switches SW1 to SW8 of the line switching device 4 are connected to the upper contacts in the drawing, so that the master station device 2 and the 1-system ITC 5 are communicably connected, and the simulated master station device 3 And the 2-system ITC 6 are communicably connected. That is, the 1-system ITC 5 is a regular system and the 2-system ITC 6 is a standby system. Further, since the switch SW9 is connected to the upper contact, it is possible to receive a failure signal from the system 1 ITC5. Furthermore, since the switch SW11 is connected to the upper contact, the 1-system ITC 5 can control the device 8.

  Then, the line switching device 4 performs an operation of switching the line by failure detection, manual operation, or remote control by CDT or the like. Specifically, a control circuit (not shown) receives a line switching instruction and first opens the switch SW10 for a few seconds to reset the power supply of the 1-system ITC 5 and the 2-system ITC 6. At the same time, the switches SW1 to SW9 and SW11 are collectively switched from the upper contact to the lower contact. As a result, the 1-system ITC 5 and the 2-system ITC 6 perform initial setting (initialization including establishment of a communication link) and time synchronization in accordance with the master station apparatus whose line connection has been switched. Time synchronization is a process of adjusting the clock of the slave station device to the time of a standard clock provided in the master station device.

  In FIG. 2, the switches SW1 to SW8 of the line switching device 4 are connected to the lower contacts in the figure, so that the simulated master station device 3 and the 1-system ITC 5 are communicably connected, and the master station device 2 and 2 system ITC6 are connected so that communication is possible. That is, the 1 system ITC 5 is a standby system and the 2 system ITC 6 is a regular system. Further, since the switch SW9 is connected to the lower contact, it is possible to receive a failure signal from the second system ITC6. Further, since the switch SW11 is connected to the lower contact, the 2-system ITC 6 can control the device 8.

  If automatic switching (switching control with failure detection as a trigger) is performed, the power supply is immediately reset when the normal system 1 ITC 5 fails, so that detailed error information of the failed system 1 ITC 5 can be collected. Can not. In this case, detailed error information cannot be transmitted in response to a request from the master station device 2. Therefore, if manual switching or remote switching is supported instead of automatic switching, detailed error information is collected when a failure of system 1 ITC 5 is detected, and then power reset and switching of system 1 ITC 5 and system 2 ITC 6 are performed. It can be carried out. From the above, the line switching device 4 is automatically switched in accordance with the operational circumstances of the remote monitoring control system 1 (whether priority is given to automatic recovery of slave station devices or collection of detailed error information). Whether or not can be arbitrarily selected.

  Further, even if the standby system 2 ITC 6 breaks down, automatic switching is not performed. In this case, the cause of the failure is investigated without resetting the standby system.

  According to the embodiment of the present invention described above, in the remote monitoring and control system 1 in which the slave station devices are divided into the normal system and the standby system, the master station device 2, the 1 system ITC5 and the 2 system ITC6 (slave station) When changing the transmission method to / from the device) from cyclic to HDLC, by interposing the line switching device 4, the modification of the existing master station device 2 is only HDLC, and the master station device 2 operates. From the supervisory control program, one of the 1-system ITC5 and the 2-system ITC6 can be seen as one ordinary slave station device, so that the existing system configuration information and monitoring screen at the control station can be used as they are. . The 1-system ITC 5 and the 2-system ITC 6 need to be new HDLC devices, but the line switching device 4 switches communication between the master station device 2 and the two slave station devices. There is no need to provide a general-purpose device. According to the above, it is possible to realize HDLC operation at low cost while maintaining reliability by combining development of general-purpose devices and suppressing development costs.

  Although the best mode for carrying out the present invention has been described above, the above embodiment is intended to facilitate understanding of the present invention and is not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and equivalents thereof are also included in the present invention.

DESCRIPTION OF SYMBOLS 1 Remote monitoring control system 2 Master station apparatus 3 Simulated master station apparatus 4 Line switching apparatus 5 1-system ITC (1st slave station apparatus, slave station apparatus)
62 2 ITC (second slave station device, slave station device)
7 DC power panel 8 Equipment

Claims (8)

A master station device that monitors the status of devices in remote locations;
A first slave station device and a second slave station device that detect the state of the device and notify the master station device;
A line switching device for switching a line connecting the master station device, the first slave station device and the second slave station device;
With
The master station device transmits a control signal requesting status data of the device to the line switching device, and receives a status signal including the status data of the device from the line switching device,
The line switching device connects the master station device to an ordinary slave station device among the first slave station device and the second slave station device, and controls the control from the master station device. When a signal is passed to the active slave station device and the status signal from the active slave station device is passed to the master station device and a line switching instruction is received, the master station device And connecting the control signal from the master station device to the standby slave station device and passing the status signal from the standby slave station device to the master station device. Through
When the first slave station device and the second slave station device receive the control signal from the line switching device, the first slave station device and the second slave station device detect the state of the device and generate the state signal according to the state of the device. A remote monitoring control system, wherein the status signal is transmitted to the line switching device. The remote monitoring control system according to claim 1,
Further comprising a simulated master station device that performs communication confirmation of the standby slave station device,
The simulated master station device transmits a simulated control signal, which is the control signal used for communication confirmation, to the line switching device and receives a simulated status signal, which is the status signal used for communication confirmation, from the line switching device. And
The line switching device connects the simulated master station device and the standby slave station device, passes the simulation control signal from the simulated master station device to the standby slave station device, and When the simulated status signal from the standby slave station device is passed to the simulated master station device and the line switching instruction is received, the simulated master station device is connected to the regular slave station device. And passing the simulation control signal from the simulated master station device to the active slave station device and passing the simulated status signal from the regular slave station device to the simulated master station device,
When the first slave station apparatus and the second slave station apparatus receive the simulation control signal from the line switching apparatus, the first slave station apparatus and the second slave station apparatus switch the simulated state signal without detecting the state of the device. A remote monitoring and control system characterized by transmitting to a device. The remote monitoring control system according to claim 1 or 2,
The line monitoring apparatus, when receiving an instruction for line switching, resets the power of the first slave station apparatus and the second slave station apparatus. The remote monitoring control system according to any one of claims 1 to 3,
The case where the line switching device receives the line switching instruction means that the failure of the regular slave station device is detected, the case where a manual switching instruction is received, or the case where a switching instruction by remote control is received A remote monitoring control system characterized by being a case. A master station device that monitors the status of devices in remote locations;
A first slave station device and a second slave station device that detect the state of the device and notify the master station device;
Intervening between
The master station device is connected to a regular slave station device among the first slave station device and the second slave station device, and the control signal from the master station device is connected to the regular slave device. When passing through the slave station device and passing the status signal from the regular slave station device to the master station device and receiving a line switching instruction, the master station device, the standby slave station device, And the control signal from the master station device is passed to the standby slave station device and the status signal from the standby slave station device is passed to the master station device. Line switching device. The line switching device according to claim 5,
A simulated master station device that performs communication confirmation of the standby slave station device;
Interposed between the first slave station device and the second slave station device,
The simulated master station device and the standby slave station device are connected to pass the simulation control signal from the simulated master station device to the standby slave station device, and the standby slave station device The simulated master station device is connected to the regular slave station device when the simulated status signal from the simulation master station device is passed to the simulated master station device and the line switching instruction is received. A line switching device characterized by passing the simulation control signal from a device to the active slave station device and passing the simulated status signal from the active slave station device to the simulated master station device. The line switching device according to claim 5 or 6, wherein
The line switching apparatus, wherein when receiving the line switching instruction, the power of the first slave station apparatus and the second slave station apparatus is reset. A line switching apparatus according to any one of claims 5 to 7,
The case where the line switching instruction is received is a case where a failure of the regular slave station device is detected, a case where a manual switching instruction is received, or a case where a switching instruction by remote control is received. A characteristic line switching device.

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