JPH0819195A - Switch slave station and supervisory remote control apparatus using the switch slave station - Google Patents

Abstract

PURPOSE:To obtain a supervisory remote control apparatus which prevents a reply carrier signal from being output continuously to a common communication cable from a damaged switch slave station and by which a master slave station automatically specifies the damaged switch slave station. CONSTITUTION:A switch slave station 3 is provided with a carrier detector 10 which detects the existence of the output of an own-station reply carrier signal on the basis of the access of a master station 1, with a timer 11 which generates a transmission-stop instruction when the existence detection of the detector 10 is continued for a prescribed time since a damage judgment and with a contact 12 which cuts off a part between an up-signal line 2u and an own-station transmission line by means of the transmission-stop instruction. In addition, the master station 1 is provided with a damaged-slave-station discrimination means which discriminates a damaged slave station when no response is given by every slave station 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch remote station used for remote monitoring control of a switch such as a section switch of power transmission and distribution equipment, and a remote monitoring control apparatus using the switch remote station.

[0002]

2. Description of the Related Art Conventionally, a common communication cable has been used for remote monitoring and control of switches such as section switches of power transmission and distribution equipment.
A remote supervisory control device of the polling communication type with respect to N is used. As shown in FIG. 3, this conventional distant monitoring control device has a common communication cable 2 having an upstream signal line 2u and a downstream signal line 2d in a master station 1 provided in a manned monitoring station such as a sales office of a power company. Via # 1, # 2, ..., # 5
5 switchgear slave stations 3 are connected and constructed.

Then, as shown in FIG. 4, the master station sequentially outputs the call signals D # 1, D # 2, ... Of the switch slave stations 3 to the down signal line 2d. When the call signal of the down signal line 2d arrives at each switch slave station 3, at each switch slave station 3, the call signal is received by the receiver 6 of the modem 5 via the receiving transformer 4, and this receiver 6 Is supplied to the logic determination unit 7 having a microcomputer configuration. This judgment unit 7 judges whether or not there is only a call of its own station from the slave station address or the like of each call signal, and if it is a call of its own station, it executes switching control according to the information of the call signal and the execution result. Monitoring and control information reply processing based on the above.

By this reply processing, a reply signal composed of a carrier signal and reply information is formed, and this signal is sent from the logic judgment section 7 to the upstream signal line 2u via the transmitter 8 and the transmission transformer 9 of the modem 5. . Then, since each switch slave station 3 transmits a reply signal to the up signal line 2u in response to a call, every time a call signal is generated, the switch slave station 3 called by this signal is generated as shown in FIG. Reply signal U #
1, U # 2, ... Are received by the master station 1.

[0005]

In the case of the conventional remote monitoring controller of this type shown in FIG. 3, the normal polling communication shown in FIG. 4 is normally performed, but a failure occurs in any of the switch slave stations 3. However, if the carrier signal of the slave station 3 does not stop, communication between the master station 1 and the remaining sound switch slave stations 3 cannot be performed.

That is, as shown in FIG. 5, when the master station 1 sequentially sends the call signals D # 1, D # 2, ... To the down signal line 2d to call each switch slave station 3, logic determining unit 7 or the transmitter 8 of the opening and closing Utsuwako station 3 of # 5 to t _X immediately reply completion of closing Utsuwako station 3 fails, the carrier signal of the opening and closing Utsuwako station 3 of # 5 after t _X is If the signal continues to be output to the upstream signal line 2u, the reply signals of the sound switchgear slave stations 3 of # 2 to # 4 are disturbed by the carrier signal, and the master station 1 cannot receive these reply signals.

Moreover, when such a situation occurs, the master station 1 cannot identify the broken switch slave station 3, and conventionally a worker, for example, switches the switch slave station 3 of # 1 in order. It is necessary to disconnect the switch slave stations 3 one by one from the communication cable 2 and repeat the polling communication to specify the failed switch slave station 3. Therefore, if any one of the switch slave stations 3 fails, the remaining healthy switch slave stations 3 also cannot communicate, and there is a problem that the reliability cannot be improved. In addition, it takes a lot of labor and time to specify the broken switch slave station, maintenance and the like are not easy, and it takes time to restore the system.

An object of the present invention is to provide a switch slave station which prevents continuous output of a return carrier signal to a common communication cable when a failure occurs. It is also an object of the present invention to enable a master station to automatically determine and specify a failed switch slave station when any of the switch slave stations fails.

[0009]

In order to achieve the above object, a switch slave station according to a first aspect of the present invention detects the presence or absence of an output of a reply carrier signal of its own station based on a call of a master station. Carrier signal detection means, failure determination means for generating a transmission stop command when detection of this detection means continues for a predetermined time for failure determination, and between the upstream signal line and the transmission path of the own station by the transmission stop command. And transmission stopping means for blocking.

Further, a remote monitoring control apparatus according to a second aspect is formed by using the switch slave stations according to the first aspect, and each switch slave station sends a reply carrier signal of its own station based on a call of the master station. Carrier detection means for detecting the presence / absence of the output, a failure determination means for generating a transmission stop command when the detection of the detection means continues for a predetermined time for failure determination, and an up signal line and The master station is provided with a faulty slave station discriminating means for discriminating the faulty slave station from the non-response of each switch slave station.

[0011]

The switch slave station according to claim 1 configured as described above detects the presence / absence of the output of the carrier signal of its own station by the carrier signal detecting means, and responds to the call based on the call of the master station to provide the carrier signal. When the signal is output, the failure determination means measures the output duration of the carrier signal based on the presence / absence of the carrier signal detection means.

When the transmission of the carrier signal is not stopped when the failure occurs, the failure determination means issues a transmission stop command when the output of the carrier signal continues for a predetermined time,
By this transmission stop command, the transmission stop means disconnects between the upstream signal line of the common communication cable and the transmission path of the own station to prevent continuous output of the carrier signal. By preventing this continuous output, the master station and other healthy switch slave stations can communicate with each other via the communication cable.

Further, in the case of the remote monitoring and control apparatus according to the second aspect of the present invention, the carrier signal of the slave station is not output to the communication cable due to the interruption of the transmission stopping means of the broken switch slave station, and the broken switch child. When the reply from the station is not received by the master station, the failed switch slave station is discriminated and specified by the fault slave station discriminating means of the master station.

[0014]

EXAMPLE One example will be described with reference to FIGS. 1, the same reference numerals as those in FIG. 3 indicate the same or corresponding ones. The difference from FIG. 3 is that each switch slave station 3 has a carrier detector 10 as carrier signal detecting means and a timer as failure determining means. 11 and a normally closed contact 12 as a transmission stopping means, and the master station 1 is provided with a faulty slave station discriminating means formed by software of a microcomputer.

The carrier detector 10 of each switch slave station 3 outputs the carrier signal from the transmitter 8 of its own station,
The absence is detected, and the start command is given to the timer 11 during the presence detection. Further, the timer 11 is reset to the initial state and activated when the activation instruction is given from the carrier detector 10, and operates only during the input period of the activation instruction.

Then, the start command is a predetermined time T for failure determination.
If the timer continues, the timer 11 times out and activates the transmission stop command relay of the output stage, supplies the transmission stop command to the contact 12, and opens the contact 12. By this opening, the transmitter 8 and the primary side of the transmitting transformer 9 are opened, and the upstream signal line 2u and the transmission output path of the own station on the primary side of the transmitting transformer 9 are cut off and opened, and the carrier signal is transmitted. Transmission is forcibly blocked and stopped.

Therefore, as shown in FIG. 2, when the master station 1 repeatedly sends the call signals D # 1, D # 2, ... To the down signal line 2d to call each switch slave station 3, When the logic determination unit 7 or the transmitter 8 of the switch slave station 3 fails and the output of the carrier signal does not stop at t _y immediately after the switch slave station 3 of FIG. As a result, the timer 11 continues to operate.

When the predetermined time T elapses and t _z is reached, the switch slave station 5 of # 5 is automatically disconnected from the upstream signal line 2u, and the carrier signal is output to the upstream signal line 2u. The transmission signals U # 2, U # 3, ... Of the remaining healthy switchgear slave stations 3 are normally received by the master station 1 after being cut off.

Therefore, even if a failure occurs in any of the switch slave stations 3, the master station 1 and the remaining healthy switch slave stations 3 are provided.
The normal communication can be performed between and, and the reliability is remarkably improved.
In FIG. 2, the reply signal from the # 1 switch slave station 3 immediately after t _y is interfered with by the carrier signal from the # 5 switch slave station 3, but the master station 1 then receives the # 1 switch slave. When the station 3 is called, the reply from the switch slave station 3 is obtained.

Furthermore, since the master station 1 does not receive a carrier signal at the time of calling the switch slave station 3 of # 5 immediately after t _y , no response occurs. The station discrimination means discriminates that the switch slave station 3 of # 5 is a faulty slave station and identifies the faulty slave station. Therefore, the faulty slave station can be automatically identified, maintenance management is facilitated, and restoration can be performed in a short time. The configurations of the carrier signal detecting means, the failure determining means, the transmission stopping means, and the failed slave station determining means of the master station 1 of each switch slave station 3 are not limited to those in the embodiment.

[0021]

Since the present invention is configured as described above, it has the following effects. First, in the case of the switch slave station according to claim 1, when the carrier signal detecting means detects the presence / absence of the output of the carrier signal of the own station and outputs the carrier signal in response to the calling of the master station, the carrier signal is output. Based on the presence / absence of the signal detection means, the failure determination means measures the output continuation time of the carrier signal.

When the output of the carrier signal continues for a predetermined time due to a failure, the transmission stopping signal of the failure determining means causes the transmission stopping means to cut off between the upstream line of the communication cable and the transmission path of the own station. Therefore, the failed switchgear slave station is automatically disconnected from the upstream signal line of the communication cable, and normal communication can be performed via the communication cable between the master station and the remaining healthy switchgear slave stations, ensuring reliability. Can be greatly improved.

Next, in the case of the remote monitoring and control apparatus according to claim 2, the transmission signal of the transmission stopping means of the broken switch slave station is cut off, and the carrier signal of the slave station is no longer output to the communication cable, causing a malfunction. When communication from the switchgear slave station is no longer received by the master station, the faulty slave station determining means of the master station will automatically identify and identify the faulty switchgear slave station from its non-response, and perform maintenance work. In addition to improving the serviceability, there is an advantage that the recovery can be performed in a short time.

[Brief description of drawings]

FIG. 1 is a block connection diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a communication state when a failure occurs in FIG.

FIG. 3 is a block connection diagram of a conventional example.

FIG. 4 is an explanatory diagram of a communication state at a normal time of FIG.

5 is an explanatory diagram of a communication state when a failure occurs in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 master station 2 communication cable 2u upstream signal line 2d downstream signal line 3 switch slave station 10 carrier detector as carrier signal detection means 11 timer as failure determination means 12 contact as transmission stop means

Claims (2)

[Claims] 1. A switch slave station for performing 1-to-N polling communication with a master station via a common communication cable having an up signal line and a down signal line, wherein a return carrier of the self station based on a call of the master station. Carrier signal detection means for detecting the presence / absence of signal output, failure determination means for generating a transmission stop command when the detection of the detection means continues for a predetermined time for failure determination, and the upstream transmission by the transmission stop command. A switch slave station comprising: a transmission stop means for disconnecting between a signal line and a transmission path of its own station. 2. A master station and a plurality of switch slave stations are connected to each other through a common communication cable having an up signal line and a down signal line.
In a remote monitoring and control device for performing polling communication with a pair N, carrier signal detection means for detecting presence / absence of output of a reply carrier signal of its own station based on a call of the master station, in each switch slave station, Failure determination means for generating a transmission stop command when the presence of the detection means continues for a predetermined time for failure determination, and transmission stop means for disconnecting between the upstream signal line and the transmission path of the own station by the transmission stop command. The remote monitoring and control apparatus according to claim 1, further comprising: a failure slave station determining unit that determines a failure slave station based on no response of each switch slave station.