JPS62120730A - Line changeover equipment - Google Patents

Abstract

PURPOSE:To simplify the system constitution, to improve the utilizing efficiency and to facilitate the switching operation at an abnormality by providing a common transmission line connecting two controllers having a similar supervisory control function and transmitting each supervisory control signal to a controlled system and transmitting the supervisory control signal having an always proper level to the controlled system. CONSTITUTION:A supervisory control system consists of an overall control station 10 and a management station 11 being a standby control station. A control signal and a supervisory signal are transmitted between the overall control station 10 and an electric station 12 through a B route line 32b and a common transmission line 32c. Suppose that a fault takes place in an A route line 32a and the transmission of each control signal through the route is disabled. In this case, each control signal of each channel from the overall control station 10 is transmitted to the electric station 12 through the management station 11 and the B route line 32b and the common transmission line 32c. Thus, even when a fault takes place in the A route line 32a, the control signal from the overall control station 10 is transmitted surely to the electric station.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a line switching device used in a system for remote monitoring and control of power plants and substations, for example.

[Prior art]

In recent years, systems have been used to remotely monitor and control power plants and substations from a general control center, for example. In such a system, operators can be centrally located in a central control center, and many advantages can be obtained, such as increased operational efficiency and maintenance of reliability for emergency operations.

By the way, in the above-mentioned system, the control device of the general control center! or a general control center and a controlled object (i.e. a power plant,
If a failure occurs in the line connecting substations, monitoring and control operations may become impossible and the reliability of the entire system may drop significantly. - There is a method in which a power station is provided and a backup line is provided to connect the backup control center and the controlled object.

[Problem that the invention seeks to solve]

If the control system is equipped with a backup control center and backup line as described above, even if a failure occurs in the general control center,
It is possible to perform monitoring and control operations on the controlled object through a separate route, and the reliability of the system can be improved. However, in such a system, if there are a plurality of objects to be controlled, a backup control center and a backup line are required depending on the objects to be controlled), which increases the scale and cost of the system. Furthermore, there is also the problem that switching the supervisory control operation from the general control center to the standby control center in the event of an abnormality requires a relatively large amount of processing time and work.

An object of the present invention is to realize a simple and highly efficient configuration of a supervisory control system in a system that performs supervisory control on a controlled object using a main control center and a backup control center, and to facilitate switching operations in the event of an abnormality. The object of the present invention is to provide a line switching device that can improve the reliability of the entire system.

[Means and effects for solving the problems] In the present invention,
In a supervisory control system consisting of a first control device that performs supervisory control on a controlled object and a spare second control device that has the same supervisory control function as the first control device, each control device is connected. A common transfer line is provided for mutually transferring each supervisory control signal to the controlled object through the transfer route of the other party. Further, line selection means is provided for detecting the level of the supervisory control signal transferred through each transfer route, and always selecting a supervisory control signal having an appropriate level from one of the transfer routes and transmitting it to the controlled object. .

By using a line switching device having such a configuration, it is possible to simplify the configuration of the supervisory control system and realize efficient operation.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a block diagram showing the configuration of a supervisory control system according to an embodiment. In FIG. 1, for a controlled object, which is, for example, an electrical plant 12, the supervisory control system includes a general control center (c) 10 (main control center) and a management center 11 which is a backup control center. The general control center 1o transmits each control signal and monitoring signal of the remote control bag r113a% remote monitoring device (supervision) 14a corresponding to the first channel CHI and the remote control device 13b1 remote monitoring device 14b corresponding to the second channel CH2. Equipped with a circuit for transfer. That is, the general control center 10 has transformers (hybrid transformers) 15a to
xsf 1st f Yanel CHI filter (for monitoring CH1
') (BPF)xsa ~xec, 2nd channel CH2
filter (for monitoring CH2/) (BPF) 1ya ~
17c% line, XI'lte circuit 18a, 18b, far
Nei: XI1f19a.

It includes relay circuits 21 and 22 that control J9b, zoa, 2ob, and each channel switch.

On the other hand, the management center 11 is a 15th station similar to the general control center 10.
- The remote control device 13C1 corresponding to the Yanel CHI is equipped with a circuit for transferring control signals and monitoring signals of the remote control device 13d and the remote monitoring device z4d corresponding to the remote monitoring device X4C and the second channel CH2. That is, even if the control center 11 is closed, the transformers 233 to 23d and the first channel CHI filter (CH1' for monitoring) 24a to 2
4C1 Filter for second channel CH2 (CH2 for monitoring
) 258-25C, line switch circuits 26a, 26
b, channel switch y-27a~27G and 28a~2
Relay circuit 29 that controls 8C and each channel switch
゜30 is installed.

Between the general control center 10 and the electric station 12, the transport terminal equipment 31
a, 31e and transfer line (hereinafter referred to as A route line) 3
Control or monitoring signals are transferred through 2a. Further, between the management center 1 and the electric station 12, the transport terminal station sJb is used.

311 and transfer line (hereinafter referred to as B route line) 32b
Transfer of control or supervisory signals takes place through the The electric station 12 has transformers 338 to 33d1 for the 1st Y-Yanel cH1":)4A/934a.

34b, 2nd Y-Yanel CH2 74) L/935a
.

35b1 line switch circuits 36a and 36b. The electric station 12 includes a remote control device & a 97a% remote monitoring device 38a corresponding to the first channel CH1 of the electric station, a remote control device 37b and a remote monitoring device 38b corresponding to the second channel CH2, and the general control center 10. Alternatively, it relays the transfer of control signals and monitoring signals to and from the management center 11.

Between the general control center 10 and the management center 11, the conveyor end finishing Q3
Control signals and monitoring signals are transferred through 1G, 31d, and the common transfer line 32G. That is, the general control center 1
0 and the electric station 12, control signals and monitoring signals are transferred through the B route line 32b and the common transfer line 32C. In addition, management office 1
1 and the electric station 12, control signals and monitoring signals are transferred through the A route line 32a and the common transfer line 32C.

Here, line switch circuits 18F1 and 18 shown in FIG.
b, 26a, 26b, 36m.

Each of 36b is composed of a circuit as shown in FIG. 2, for example. That is, this circuit consists of a signal level detection circuit 40 and a changeover switch circuit 4. The signal level detection circuit 40 includes comparators 42 and 43, inverter circuits 44 and 45, AND circuits 46 and 47, a flip-flop circuit 48, and a driver 49.

Comparators 42 and 43 receive input signals Va and ■
b and the reference level signal Vr, the input signal Va,
When VbO is at a higher level, an rHJ level signal is output. Here, the input signals Va and Vb are supplied to the B contact terminal 50 and the A contact terminal 51 of the changeover switch circuit 41.

Now, if each of the input signals Va and Vb are both at a higher level than the reference level signal Vr, then the input signal V
When the input signal vb is outputted from the #:J1 conversion switch circuit 41 instead of a, the signal becomes K. That is, the line switch circuit selects one of the input lines that transfers a signal at a normal level, and operates so as to always output a signal at a normal level (i.e., a control signal and a monitoring signal). Become. When the changeover switch circuit is in operation and only the input signal vb is at a level lower than the reference level Vr, the Q output of the flip-flop 48 is at the rLJ level as described above9.
The driver 49 is restored, the changeover switch circuit 41 is also restored, and the input signal Va is output from the changeover switch circuit 41.

In the supervisory control system configured as described above, the operation of this embodiment will be explained. First, in the general control center 10,
The control signal output from the remote control device 13a of the first channel CHI is transmitted to the transformer 15a1 channel switch 19a.
, and is transferred to the carrier terminal device 31d through the transformer 15e. Further, the control signal output from the remote control device 13a is transferred to the carrier terminal device 31a through the transformer 15a, the channel switch 19b1, and the transformer J5d. Similarly, the second channel CH2 remote control bag @J sd
The control signal output from the converter 15b, channel switch 20a, and transformer 15e is sent to
31d. Further, the control signal output from the remote control device 13b is transmitted to the conveyor end finishing @SZa through the transformer 15b1 channel switch 20b1 and the transformer 15d.
will be forwarded to. Each control signal transferred to the carrier terminal device 31a is transferred to the electrical station 12 via the A route line 32a and the carrier terminal device 31e. In the electric station 12, the control signal output from the conveyor end finishing @316 is sent to the filter 3.
4b and 35b, the signal of the first channel CH1 is transferred to the line switch circuit 36a, and the signal of the second channel CH2 is transferred to the line switch circuit sgb.

On the other hand, the carrier terminal equipment! Each control signal transferred to /31d is transferred to the management center 11 via the common transfer line 32G and the carrier terminal device 31C. At the management center 11, among the control signals output from the carrier terminal station flsxc, the control signal for the first channel CH1 is transferred to the carrier terminal apparatus szb through the filter 24C, the channel switch 27C1, and the transformer 23C. Similarly, the control signal for the second channel CH2 is transmitted through the filter 25C and the channel switch 28C1.
and is transferred to the carrier terminal device 31b via the transformer 23C. Each control signal transferred to the carrier end station bag 31b is
It is transferred to the electrical station 12 via the B route line 32b and the carrier terminal station stf. At the electric station 12, the control signal fins 934a and 35 outputted from the carrier terminal device 31f are
According to a, the signal of the first channel CH1 is transferred to the line switch circuit 36a, and the signal of the second channel CH2 is transferred to the line switch circuit 36b.

The line switch circuit 36a of the electric station 12 detects the level of each control signal of the first channel CH1, and selects and outputs a control signal at a normal level (usually a control signal via the human route line 32a). Line switch circuit 36
The control signal output from a is transmitted to transformers 33G and 33a.
is transferred to the remote control bag @s'ia of the first channel CH1 on the side of the controlled object. Similarly, in the line switch circuit 36b of the electric station 12, the level of each control signal of the second channel CH2 is detected, and the normal level control signal (
Normally, the control signal via the A route line 32B) is selected and output. The control signal output from the line switch circuit seb is transferred to the remote control device 37b of the second channel CH2 on the controlled object side through the transformers 33C and 33a.

By the way, let us now assume that a failure occurs in the A route line 32a and that each control (transfer of No. 5) via this route is impossible. In this case, as described above, the control Each control signal is transmitted through the common transfer line 32C1
Electrical station 12 through management office 11 and B route line 32b
has been transferred to. Therefore, even if a failure occurs in the A route line 32a, the general control center 10
This ensures that control signals from the

Next, it is assumed that a failure occurs in each of the remote control devices 13a and 13b of the first channel CH1 and second channel CH2 of the general control center 10, and each control signal is not output from the general control center 10. In this case, the preliminary control signals of the first channel CHI and the second channel CH2 are transferred from each remote control device 13G, 13d of the management center 11 to the electric station 12. That is, first, in the general control center 10 and the management center 1), the relay circuits 21 and 22 and the relay circuits 29 and 30 operate to switch the channel switch 19a of the general control center 10.

Channel switches for 19b, 20a, 20b and management center 11! '78 to 27G and 28a to 28 are respectively switched. At the management station 11, the control signal from the remote control bag rIt13G of the first channel CHI is transmitted to the transformer 23.
The signal is transferred to the carrier terminal device 31b via the a% channel switch 27C and the transformer 23C. Further, the control signal of the first channel CH1 is transferred to the carrier terminal device 31C through the transformer 23a, the channel switch 27a, and the transformer 23d. Similarly, the control signal from the remote control device 1sd of the second channel CH2 is transferred to the carrier terminal device 31b through the transformer 23b1 channel switch 28C and the transformer 23C. Further, the control signal of the second channel CH2 is transferred to the carrier terminal device 31C through the transformer 23b, channel switch 28B, and transformer 23 (1). Each control signal output to the carrier terminal device xb is It is transferred to the electrical station 12 through the B route line 32b and the carrier terminal equipment 31f.On the other hand, each control signal output to the carrier terminal equipment JJC is transferred to the general control center through the common transfer line 32C and the carrier terminal equipment bag @31d. In the general control center 10, the control signal of the first channel CH1 among the control signals 4i output from the carrier terminal device 31d is transferred to the filter 16a1, the channel switch 19b, and the transformer 15.
d to the carrier terminal device 31a. Similarly,
The control signal of the second channel CH2 is transferred to the carrier terminal device 31a through the filter 17a1, the channel switch 20b1, and the transformer 15d. Each control signal transferred to the carrier terminal device 31a is transferred to the electrical station 12 via the A route line 32a and the carrier terminal device 31e. At the electric station 12, the same operation as when each control signal is transferred from the general control station 10 as described above is executed, and the control station 1
Each control signal from 1 is sent to each remote control device sva on the electric station side.
, syb.

For this reason, each remote control device 13a, 1 of the general control center 10
Even if a failure occurs in the control center 3b and each control signal is not output from the general control center 10, each control signal from the management center 11 will be reliably transferred to the electric power station 12. Also, B
Even if a failure occurs in the route line 32b, the management center 1
Each control signal from 1 will be transferred to the electric station 12 through the general control center 10 and the A route line 32a.

Therefore, the A route line 32at or the B route line 3
2b, or if a failure occurs in one of the control center 1
Even if a failure occurs in the power station and each control signal is not output, each control signal can be reliably transferred to the electrical station.

Next, in contrast to the transfer of control signals as described above, transfer of a monitoring signal to an electric station will be briefly explained. The first channel C) (l/and the second channel CH2' on the electric station side
The monitoring signals output from the remote monitoring devices ssa and ssb are transmitted to the carrier terminal device 3 through transformers 33b and 33d.
It is output to 1e and 31f. Each monitoring signal output to the carrier terminal device 31e is transferred to the general control center 10 via the A route line 32B and the carrier terminal device 31a. In the general control center 10, the monitoring signal of the first channel CH1' is transmitted through a filter 16C1, a transformer 15C and a line switch circuit 18.
The data is transferred to the remote monitoring device 24a through a. Further, the monitoring signal of the second channel CH2' is transferred to the remote monitoring device t4b through the filter 17C1 transformer xsf and the line switch circuit 18b.

On the other hand, each monitoring signal output to the carrier terminal device 31f is
The data is transferred to the management center 11 via the B route line 32b and the carrier terminal device 31b. At the management center 11, the monitoring signal of the first channel CHI' is sent to the carrier terminal station S through the filter 24a, the channel switch 27ja, and the transformer 23d.
Transferred to ZC. Further, the monitoring signal of the second channel CH2' is transferred to the carrier terminal equipment szc through the filter 25a1 channel switch 28a and the transformer 23d. Each monitoring signal output to the carrier terminal device 31C is transferred to the general control center 10 via the common transfer line 32C and the carrier terminal device s1d. In the general control center 10, the monitoring signal of the first channel CHI' from the carrier terminal device 31d is as follows.
The signal is transferred to the line switch circuit 18a through the filter 16b. Further, the monitoring signal of the second channel CH2' is transferred to the line switch circuit 18b through the filter 17b.

Assume now that a failure occurs in the A route line 32a and each monitoring signal from the electric station is not transferred to the general control center 10. In this case, as mentioned above, the B route line 32
b and the control center 11, each monitoring signal is sent to the general control center 1.
Transferred to 0. In the general control center 10, the line switch circuit 18a detects an abnormality in the supervisory signal from the A route line 32a and performs a switching operation, and the supervisory signal of the first channel CH1/ output from the filter 16b is transmitted far from the line switch circuit 18a. It is transferred to the monitoring device J4a. Similarly, the line switch circuit 18a performs a switching operation, and the filter J
The monitoring signal of the second channel CH2/ outputted from 7b is transferred from the line switch circuit 18b to the remote monitoring device 14b. Therefore, even if a failure occurs in the A route line 32a, each monitoring signal from the electrical station will be reliably transferred to the general control center 1θ.

Also, a remote monitoring device 14a of the general control center 10.

If a failure occurs in the control station 14b and the monitoring signal from the electrical station cannot be received, the remote monitoring devices 24C and 74d of the control station 1
In this case, the relay circuits 21.2.2 and 29.30 operate in the same manner as described above, and the channel switches 19a, 19b, 20a, 20b and channel switches 27a to 27G and 28a to ZSC respectively switch. Accordingly, each monitoring signal transferred through the B route line 32b is transmitted to the remote monitoring device 14 of the management center 11.
Supplied to C914d. Further, each monitoring signal transferred through the A route line 32a is transferred to the management center 11 through the general control center 10, carrier terminal equipment 63Jd, common transfer line 32G, and sweep terminal equipment 31C. become. Even if a failure occurs in the remote monitoring equipment @14a, 14b of the general control center 10, each monitoring signal from the electrical station will be reliably received and monitored by the remote monitoring equipment z4c, 14d of the control center 11. That will happen. At this time, even if a failure occurs in the B route line 32b, each monitoring signal transferred through the A route line 32a is sent to the remote monitoring device 14c of the management center 11.

It will be supplied to J4d.

〔Effect of the invention〕

As described in detail above, according to the present invention, in a system in which a main control center and a backup control center monitor and control a controlled object, a common line connecting each control center can be used to monitor multiple channels. Control signals can be transferred via two line routes. Therefore, even if a failure occurs in one of the line routes or the main control center, it is possible to reliably transfer the supervisory control signals of multiple channels between the controlled object and the control center. Furthermore, even when there are multiple controlled targets,
It is possible to perform reliable monitoring and control operations for the controlled object without increasing the backup control center and backup line route accordingly.

Furthermore, when an abnormal situation occurs, it is possible to easily transfer appropriate supervisory control signals through the operation of each channel switch and line switch circuit in the main control center and the standby control center. Therefore, with a simple switching operation,
The reliability of the entire system can be improved. Therefore, as a result, it is possible to realize a highly reliable, simple, and highly efficient supervisory control system configuration.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a block diagram showing the configuration of a supervisory control system according to an embodiment of the present invention, and FIG. 2 is a block diagram showing an example of a specific configuration of a line switch circuit according to the same embodiment. It is. 13a to 13d, 37a, 37b...Remote control device, 14a to 14d, 38a, 38b"-distant monitoring device, 18a, 18b, 26a, 26b. 36a, 36b... Line switch circuit, 32a...
・A route line, 32b...B route line, J2C・
...Common transfer line.

Claims (1)

[Claims] In a supervisory control system comprising a first control device that performs supervisory control on a controlled object and a second control device having the same supervisory control function as the first control device, the first control device
a first transfer line for transferring a supervisory control signal between the control device and the controlled object; and a second transfer line for transferring a supervisory control signal between the second control device and the controlled object.
common transfer that connects a transfer line, the first control device and the second control device, and transfers each of the monitoring control signals to each other through the first transfer line or the second transfer line of the other party; detecting the level of the supervisory control signal transferred through the line, the first transfer line, and the second transfer line, and selecting a monitor control signal having an appropriate level from one transfer line to the controlled object; 1. A line switching device comprising a line selection means for transferring data to a line.