JPH0419910Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a switch interlock device that prevents erroneous operation of switching circuits such as shield breakers and disconnectors in power receiving and substation equipment.

[Technical background of the invention and its problems] Conventionally, switch interlocks in power receiving and substation equipment have been constructed with normally open or normally closed hard contacts, but in this case, many auxiliary contacts are required for the switch. Not only that, but especially when the interlock system is complex, a huge amount of space is required for the cables between devices to configure the interlock circuit, the terminal blocks inside the equipment to connect these cables, and the cable entry space. This was one of the reasons why the main engine and control device became larger and more expensive.

[Purpose of the invention] The present invention was made to solve the above problems, and uses a microcomputer applied control device to
The purpose of this invention is to provide a switch interlock device that reduces the amount of cables, terminal blocks, cable space, etc., and has a reliability equivalent to or higher than the current one.

[Summary of the invention] In this invention, the master station receives the status signals of the normally open contacts of all devices from each slave station, thereby configuring the interlock circuit of the device, and the slave station receives the status signals of the normally open contacts of all the devices from each slave station. Incorporating both normally closed contacts, construct an interlock circuit with normally open contacts and an interlock circuit with normally open contacts, check these with each other, and if the conditions of other line equipment are required, the slave station of other line On the condition that it is normal, it is taken in via the transmission line via the master station and an interlock is configured for the device. Finally, the interlock check result configured at the master station is compared with the interlock check result configured at the slave station, and if both results meet the interlock conditions, the final interlock output is determined. This is what I did.

[Embodiment of the invention] Structure of the embodiment The structure of the invention is shown in FIG. Main machine 1 for each line
It has a star connection type network configuration consisting of a microcomputer-applied slave station 2 that shares control of the system, and a microcomputer-applied master station 4 that centrally controls the entire system via a transmission line 3.

Each slave station 2 receives the device's normally open contact signal 5 from each main unit 1.
and the normally closed contact signal 6, and transmits the normally open contact signal 5 to the master station 4. Based on this, the master station 4 performs an interlock check, and the slave station 2 receives the normally open contact signal 5 and the normally closed contact signal. 6 to perform an interlock check. Then, the interlock check result at the master station 4 is compared with the result at the slave station 2, and a final interlock output 7 is output from the slave station 2 to the main machine 1.

Effects of the Embodiment Next, the effects of the present invention will be explained with reference to FIG. As mentioned above, the normally open contact signals 5 of all devices are input from each slave station 2 to the master station 4 via the transmission line 3, so that all the interlock conditions of the devices are checked and confirmed. If it is satisfied, the output 8 of all interlock conditions shown in FIG. 2 is transmitted to the slave station 2 as a signal that the device interlock condition is satisfied by the master station. Also, the slave station 2 also checks the interlock conditions in a double check sense, but the interlock conditions of other line devices are not directly input to the slave station 2, so the interlock conditions of the other line devices are not directly input to the slave station 2. All the interlock conditions of the other line equipment are checked, AND is performed with the condition that the other line slave station is normal, and the result is transmitted to the slave station 2 as the other line equipment interlock condition fulfillment signal 9.

On the other hand, the slave station 2 receives the normally open contact signal 5 and the normally closed contact signal 6, and checks the interlock conditions within its own line using the normally open contact signal 5 and the result of checking the normally closed contact signal 6. Takes the AND with the own line equipment interlock condition fulfillment signal 1
0, and then AND's this with the other line equipment interlock condition fulfillment signal 9 transmitted from the master station 4 to obtain the equipment interlock condition fulfillment signal 11 from the slave station. Furthermore, the device interlock condition fulfillment signal 8 from the master station transmitted from the master station 4 is ANDed with the device interlock condition fulfillment signal 11 from the slave station, and this is set as the final interlock output 7 of the device. Output to 1.

Therefore, the slave station 2 performs a double check using the normally open contact signal 5 and the normally closed contact signal 6, and then the master station 4
The structure is such that double checks are made for interlock between the terminal and the slave station 2 as well. Also, 12 in Figure 2 is
An AND circuit is shown.

Effects of the Embodiment As explained above, in this embodiment, when an abnormality such as a contact switching failure in the main engine is detected by a double check using the normally open contact signal 5 and the normally closed contact signal 6 at the slave station, the interlock condition is not satisfied. This acts on the fail-safe side. Further, if a slave station of another circuit has a device failure, the master station 4 invalidates the other circuit device interlock condition satisfaction signal 9, and the interlock condition becomes unsatisfied, which also acts on the fail-safe side.

Also, even if an incorrect interlock check result is transmitted to the slave station 2 due to a failure in the upper system, including the transmission line 3, the interlock check result will be checked here in order to finally compare it with the interlock check result at the slave station 2. Detected and blocked. Furthermore, in the event of a device failure in the slave station 2, the output circuit blocks all output to the main unit 1, so that no erroneous output is produced and a fail-safe operation is achieved.

[Effects of the invention] As explained above, according to the invention, a microcomputer-applied control device is used and the interlock circuit is configured by software, so fail-safe in the event of equipment or main engine failure is fully considered.
It is possible to use an interlock system with higher reliability than the current one. In addition, conventionally, a large number of auxiliary contacts were required for control/indication, including interlocks, but this can be satisfied with only one contact each for normally open and normally closed, and the number of contacts, amount of cables, number of terminals, Cable space is significantly reduced, allowing for a compact and inexpensive system configuration. Furthermore, changes in the interlock system or future expansion can be easily accommodated by changing only the software.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram for explaining the operation. 1...Main machine, 2...Slave station, 3...Transmission line, 4...
...Master station, 5...Normally open contact signal, 6...Normally closed contact signal, 7...Final interlock output, 8...Signal that the device interlock condition is met by the master station, 9
...Other line equipment interlock condition fulfillment signal, 1
0...Own line equipment interlock condition fulfillment signal,
11...Signal that the device interlock condition is met by the slave station, 12...AND circuit.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A plurality of slave stations that share control of equipment on a line-by-line basis, and a master station that is connected to these slave stations via a transmission path and that centrally controls these slave stations. In the microcomputer applied control device configured, interlock checks are performed between the master station and slave stations, respectively.
A switch interlock device characterized in that the results of each of these checks are collated and the result is a final interlock output. (2) A utility model characterized in that the final interlock output takes in each of the normally open and normally closed contacts of the device and compares the interlock check results with the normally open contacts and the interlock check results with the normally closed contacts. An interlock device for a switch according to claim 1.