JPH01136431A - Switch group supervision equipment - Google Patents

Abstract

PURPOSE:To send the production of state change quickly to a master station by interrupting priority polling when a slave station detects a state change in an object to be supervised so as to inform the sure production of the state change to the master station. CONSTITUTION:If slave stations 6aa-6MN detect a status change requiring emergent communication, a start command signal is sent from the slave stations 6aa-6MN to the master station 1 as an incoming signal, and when the master station 1 receives the start signal, a steady polling is stopped and the master station supervises priority designation slave stations selected and designated in advance as to distribution lines 3a-3M, for example, slave stations 6aN, 6bN-6JN... at the ends of distribution lines 3a-3M sequentially. In such a case, since the slave station 6JN gives no reply, the occurrence of a fault is confirmed. Then the master station 1 supervises sequentially other slaves stations 6Ja, 6Jb-6Jk... on the same distribution line 3J as the slave station 6JN whose fault is confirmed according to the order at steady-state polling and when the communication is finished entirely, the steady polling is restored.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention provides a system in which a master station and slave stations each controlling a plurality of section switches on each distribution line connect the distribution line and the ground as a transmission path. The present invention relates to a polling-type switch group monitoring device that sends and receives signals using a return-to-ground distribution line.

[Conventional technology]

FIG. 4 shows the system configuration of a conventional switch monitoring device of this type. In the figure, ■ is a master station that monitors the status of the switch and sends control signals to slave stations; 2 is a master station coupler for injecting and extracting signals between the master station I and the distribution line 3; 3. 3a to 3N are distribution lines used as carrier signal transmission paths, 4aa to 4MN 55aa to 5MN are slave station combiners for injecting and extracting signals between the slave stations and distribution lines 3a to 3N, 6aa ~6MN is a slave station that receives commands from master station 1 and monitors and controls the status of the switch. aa~7M
N is a section switch that is monitored and controlled from a distance from the master station 1 via the slave station.

The master station 1 and the slave stations 6aa to 6MN use a polling method in which the master station sequentially calls the slave stations at fixed time intervals using a two-frequency signal pair of the digital frequency modulation method (FSK method). Signals are sent and received via power distribution lines.

The downlink carrier signal (FSK signal transmitted from the master station 1 to the slave stations 6aa to 6MN) is injected into the power distribution line 3 through the master station combiner 2 that passes only the signal frequency component. The FSK signal transmitted between the distribution line 3 and the ground as a transmission path is transmitted to each slave station coupler 4aa to 4MN, 5aa to 5MN, which has a filter configuration consisting of a capacitor and a coupling transformer, similar to the master station coupler 2.
As a result, the commercial frequency component is removed and only the signal component is transmitted to each slave station 6aa to 6MN, and each slave station 6aa to 6M
N monitors and controls the corresponding section switches 7aa to 7MN.

In the polling method, the master station 1 has the right to select the slave stations 6aa to 6MN, and the slave stations 6aa to 6MN cannot transmit or receive unless instructed by the master station 1.The master station 1 selects the slave stations 6aa to 6MN. Communication is performed in a fixed order (communication order) determined for the 6MN. The downlink carrier signal is for each slave station 6aa~6
When transmitted to the MN, the next slave station in turn is selected and designated by the address (part of information specifying the slave station) in the downlink carrier signal, and starts reception. The designated slave station returns a response to the received signal to the master station 1 as an upstream carrier signal. Uplink carrier signals transmitted from each of the slave stations 6aa to 6MN are injected into the distribution line 3 by the slave station coupler and transmitted to the master station 1 through the master station coupler 2. The above-mentioned uplink carrier signal and downlink carrier signal are transmitted by using signals of two types of frequencies in parallel to ensure signal transmission. In the case of the polling method, the communication partner station of the master station 1 changes with respect to time as shown in FIG. 5, for example, and the communication partner changes according to a predetermined order.

Next, the operating procedures of the master station 1 and the operating procedures of the slave stations 6aa to 6MN will be explained with reference to the flowcharts of FIGS. 6 and 7.

The master station 1 monitors the slave station in the next communication order (step I
s) and stopping communication for T minutes (step 2S) are repeated alternately. The slave stations 6aa to 6MN detect input signals (step 11S), as shown in the flowchart in Figure 7.
), it is determined whether there is communication from the master station 1 or not based on the address in the downlink carrier signal (step 12S).

At this time, if there is no communication signal from master station 1, step 1
1S, and if there is a communication signal from master station 1, a corresponding process is performed (step 13S), a reply is sent to station 1 (step 14S), and the process returns to step 113.

[Problem that the invention seeks to solve]

In this conventional system, when the frequency of carrier signal injection into the power distribution line 3 increases, heat generation due to the power of the carrier signal injector increases, so that continuous polling cannot be performed from the master station 1 at all times. For that reason 1. It is necessary to allow a long period of time during which polling is not performed, and once a slave station communicates with the master station, it takes time until the next communication, and the slave stations 6aa to 6MN are in the state of the sectional switches 7aa to 7MN. When a change is detected and it becomes necessary to communicate with the master station 1 urgently, it is necessary to wait for a considerable amount of time until the communication order comes, making it difficult to quickly respond to the above-mentioned state change. was there.

This invention was made to solve the above problem.
It is an object of the present invention to provide a switch group monitoring device capable of quickly transmitting a change in the state of a monitored object to a master station even if a change in the state of a monitored object occurs before a predetermined communication order arrives.

[Means for solving problems]

In order to achieve the above object, the slave station that detects a change in the status of the distribution system to which the sectional switch to be monitored and controlled sends a signal to the master station using polling idle time. , upon receiving the signal, the master station suspends the regular polling operation and performs a priority polling operation that monitors only the pre-selected slave stations for each power distribution system, and after the completion of the priority polling operation, the master station stops the regular This configuration returns to polling operation.

[Effect]

In this invention, when the slave station detects a change in the state of the monitored object, it interrupts the steady polling operation and interrupts the priority polling operation, so that the core slave station does not wait for the communication priority in the steady polling operation. It is possible to quickly notify the master station that there has been a change in status.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 are operational flowcharts of the present invention implemented in the switch group monitoring device shown in FIG. 4.

In this embodiment, during normal times, the monitoring and control operations are performed by the conventional normal polling operation (steady polling operation) described in the conventional example shown in FIG. When a state change requiring communication is detected, a start command signal is transmitted from the slave stations 6aa to 6MN to the master station 1 as an uplink carrier signal, and when the master station 1 receives this start signal, the above-mentioned steady polling operation is performed. , and performs a priority polling operation, which will be described later, according to a predetermined priority order.

For example, a ground fault has occurred in the distribution line downstream (on the right side) of sectional switch 7JK in Figure 4, and sectional switch 7JK
If all the slave stations downstream from the master station 1 become unresponsive, the stations with which the master station 1 communicates change as shown in FIG.

Due to the occurrence of a ground fault, there is voltage on one side of the sectional switch 7J, and when the slave station 6JK detects this change in state, the core slave station 6JK will , immediately, or, if communication is in progress, after the communication has ended, start command signals of two types of frequencies are alternately transmitted to the master station 1. Even if the activation command signal of one of the frequencies is canceled by interference with another signal and is not transmitted to the master station 1, the activation command signal of the other frequency is transmitted to the master station 1. When the master station 1 receives this activation command signal, it starts the above-mentioned priority polling operation and first selects and specifies the priority designated slave stations for each distribution line 3a to 3M in advance, for example, the priority polling operation for each distribution line 3a to 3M. Slave stations at the end 6 aN, 6 bN, ...6JN, ...
be monitored in order. At this time, the female station 6JN becomes unresponsive, confirming that an abnormality has occurred. Next, the master station 1 checks the other slave stations 6 Ja, 6 Jb, ...6Jk, ... which are on the same distribution cloth 3J as the slave station 6JN in which this abnormality was confirmed.
Monitoring is performed in order according to the order at the time of regular polling, and when all these communications are completed, the routine returns to the above-mentioned regular polling operation.

The master station 1 monitors the next slave station in the communication order by a steady polling operation (step 21S), and when communication with a certain slave station is finished, it performs an operation to detect the presence or absence of an input signal for T minutes ( Step 22S), the presence or absence of the activation command signal from the slave station is determined (Step 23S). If the activation command signal is not received, monitoring is performed with the slave station in the next monitoring order. If the activation command signal has been received, the priority designated slave stations (slave stations 6aN to 6MN) are monitored in order (step 24S), and other stations on the same distribution line 3J as the slave station whose status change has been confirmed are monitored. Child stations 6Ja, 6Jb,
Step 2: 6Jk, . . . should be monitored in order.
5S) When the monitoring is completed, a steady polling operation is started.

As shown in FIG. 2, the slave stations 6aa to 6MN determine whether there is a change in the status of the monitored object (step 31S); if there is no change in status, they detect the input signal (step 35).
S) When there is a change in state, it is determined whether the master station I is in a communication state (step 32S). When master station 1 is not in communication status, it immediately sends a start command signal to master station 1 (
From step 33S), the input signal is detected. Main station l
is in the communication state, the master station 1 immediately sends the activation command signal to the master station 1 after completing the communication (step 34).
S), detecting the input signal. Following the detection of the input signal in step 35S, it is determined whether there is a communication signal from the master station 1 based on the address in the carrier signal (step 36S). At this time, if there is no communication from master station 1,
The determination of whether there is a change in status is made again. If there is communication from the master station 1, it performs corresponding processing (step 37S) and sends a reply to the 11 station 1 (step 38S), then steps 31
Return to S.

In this way, in this embodiment, when the slave station detects a change in the status of the monitoring target, it interrupts the priority polling operation, and the master station polls only the slave stations that have been selected and specified in advance. The configuration is such that even if a slave station detects a change in the status of the monitored object, it will not wait until the next steady polling order arrives.
Compared to the conventional case of waiting for the information to be transmitted to the master station 1, the information on the state change can be notified to the master station 1 more quickly.

In the above embodiment, the FSK method is used as the communication method, but the same effect can be obtained even if a phase modulation method (PSK method) is used.

Further, the monitoring operation of the master station 1 and the slave stations 6aa to 6MN may be configured to interrupt the regular polling operation and interrupt the priority polling operation when a change in the status of the monitored object is detected. The structure is not limited to those shown in FIGS. 1 and 2.

Further, the switch group monitoring device to which the present invention is applied is not limited to the configuration shown in FIG. 4.

〔Effect of the invention〕

As explained above, this invention has a structure in which when the slave station detects a change in the status of the monitored object, it interrupts the priority polling operation to notify the master station that the status change has definitely occurred. In comparison, there was a change in state,
The information can be transmitted to the master station more quickly than before.

[Brief explanation of the drawing]

1 and 2 are monitoring operation flowcharts showing an embodiment of the present invention, FIG. 3 is a time chart for explaining the priority polling operation in the above embodiment, and FIG. 4 is a switch to which the above embodiment is applied. A block diagram of the group monitoring device, FIG. 5 is a time chart showing a conventional steady polling operation, and FIGS. 6 and 7 are flow charts of the conventional monitoring operation. In the figure, 1...-master station, 3.3a--distribution line, 6 aa ~ 6
MN-Slave station, 7aa to 7MN--section switch. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] Polling type switch monitoring in which a master station and a slave station that respectively control multiple sectional switches on each distribution line send and receive signals using a return-to-ground distribution line transport method using the transmission line between the distribution line and the ground. In the device, a slave station that detects a change in the state of the distribution system to which the sectional switch to be monitored and controlled sends a signal to the master station using the polling idle time,
The master station that has received the signal interrupts the regular polling operation that has been performed so far, executes a priority polling operation that monitors only the slave stations that have been selected in advance for each power distribution system, and resumes the normal polling operation after completing the priority polling operation. A switch group monitoring device characterized by returning to operation.