JPH0646848B2 - Distribution line automation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a distribution line automation device for controlling a switch of a distribution line.

(Prior art) A large number of distribution lines connected to a substation bank are appropriately connected to each other, and at each division point of the distribution system configured as a multiple loop, a normally open switch and a time-advancing device are arranged in combination. Along with
A normally open switch that connects each distribution line and a time-advancing device are arranged in combination to enable disconnection of the accident section and load accommodation for healthy sections after the accident section, and to minimize power failure in each section as much as possible. Is being considered.

In the system with the above configuration, the timed progressive device used at each normally open point in combination with the normally open switch controls the switch with the presence or absence of the distribution line voltage on both sides of the normally open point as the information source and operating power source. Therefore, it is premised that the reclosing and reclosing operations of the circuit breaker on the substation side are always performed when an accident occurs.

By the way, for example, in the event of a short-circuit accident at the distribution line near the substation, considering the protection of the distribution line or equipment, lock the reclosing relay of the substation, and reclose and reclose the circuit by the circuit breaker on the substation side. Do not do.

However, in such a case, if the function is not stopped for each normally open point, such a timed progressive device at the normally open point is always operated on condition that the one side voltage is not applied for a certain period of time. There was a risk that the opening and closing switch would be turned on and the spread of the accident would be expanded.

Therefore, under such circumstances, in order to stop the time-advanced forwarding function at each normally open point, a remote control slave station is provided at each normally open point, and the central master station is transmitted via the transmission line. By connecting and sending a normally open point simultaneous lock command from this master station, the timed progressive function at each normally open point was stopped.

(Problems to be solved by the invention) In the above-described conventional method, if a failure occurs in the transmission line or the master station at the same time as the occurrence of a short-circuit accident or the like, the master station cannot control the slave station. Will be. When such a situation occurs in the master station, the master station recovers the slave station state by the timed progressive function without being able to recognize the slave station state.

The present invention has been made in view of the above circumstances, and in a situation in which the operating states of the master station and the slave station cannot be grasped due to a transmission path failure, the time-sequential forwarding function of the normally open point connected to the distribution line. It is an object of the present invention to provide a distribution line automation device that can stop only the power distribution line.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, in the present invention, a slave station R connected to a master station M by a transmission line is provided with a normally open point simultaneous from the master station. A receiving circuit 1 for receiving a lock command, and a timed progressive control circuit 3 for controlling a switch by the output of a power failure detection circuit 2.
And a signal diagnostic circuit 4 for detecting whether or not the content received by the receiving circuit is a predetermined signal between the master station and the slave station, and a constant value for the signal level from the master station. If the line disconnection detection circuit 5 for detecting whether or not the above is provided and normal communication cannot always be performed between the master station and the slave station,
A lock circuit 6 for outputting a lock signal to the time-limit progressive control circuit 3 is provided.

(Operation) In the above configuration, for example, when a short circuit accident occurs in the distribution line, the distribution line protection relay in the substation operates to trip the breaker. If this accident is the near-end accident of the substation, the reclosing operation is not performed, the circuit breaker remains tripped, that is, the distribution line is in a power failure. In this case, the slave station R at each normally open point, which is connected to the distribution line, detects a power failure by the power failure detection circuit 2 and the time limit progressive control circuit 3 starts counting the time limit.

Normally, this time period is set to be longer than the time for transmitting electricity to the end of the distribution line by the time-forwarding function of the normally open point (usually 2 to 3 minutes).
It has become.

In such a state, when the master station M transmits a normally open point simultaneous lock command, the receiving circuit 1 receives the command and locks the time-sequential forwarding function.
When the signal received by the receiving circuit 1 is detected by the signal diagnostic circuit 4 which detects that the signal is not a signal determined between the master station and the slave station, or the level of the determined signal is below a certain value. A lock signal is output to the time-sequential forwarding control circuit 3 depending on the OR condition when the line disconnection detection circuit 5 that detects that it has been detected is detected.

As a result, the timed progressive control circuit 3 stops the timed counting, stops the timed progressive function, and does not output the closing output to the normally open switch.

(Examples) Examples will be described below with reference to the drawings.

FIG. 1 is a functional block diagram of an embodiment of a distribution line automation device according to the present invention.

In FIG. 1, M is a master station and R is a slave station, which are connected by a transmission line. S is a normally open switch, which interconnects the distribution lines F ₁ and F ₂ .

T ₁ and T ₂ are power supply devices to the slave station R connected to the distribution lines F ₁ and F ₂ . Reference numeral 1 is a receiving circuit for receiving a normally open point simultaneous lock command from the master station M, and 2 is a power failure detection circuit for detecting a power failure of the distribution lines F ₁ , F ₂ by the secondary outputs of the power supply devices T ₁ , T _2. is there. 3 is a timed progressive control circuit that controls the normally open switch S depending on the presence or absence of output of the power failure detection circuit. Time counting is performed when the voltage of the distribution line F ₁ or F ₂ is absent, and the closing output is supplied to the normally open switch S. put out. Reference numeral 4 is a signal diagnostic circuit for detecting that the signal detected by the receiving circuit 1 is a signal determined by the master station and slave station, and 5 is a signal diagnostic circuit for detecting whether the signal from the master station is a predetermined value or more. Line disconnection detection circuit, 6 is a lock circuit,
A lock signal is output to the time-forwarding control circuit 3 under the OR condition of the output of the receiving circuit 1, the output of the signal diagnostic circuit 4, and the output of the line disconnection detecting circuit 5.

Next, the operation of the embodiment of the present invention configured as described above will be described.

In FIG. 2, CB1, CB2, CB3, and CB4 are breakers for pulling out the distribution lines of the substation, which are distribution lines F ₁ , F ₂ , F ₃ , and
F ₄ is pulled out. Then, S1, S2, S4, S5 are normally closed switches, S3, S6, S7 are normally open switches, and each distribution line is divided into sections I ... VI as shown in the figure.

And each normally open switch has a power supply T ₃₁ , T
₃₂ , T ₆₁ , T ₆₂ , T ₇₁ , T ₇₂ , each slave station R ₃ , R ₆ ,
Drawn to R ₇ . M is a master station and slave stations R ₃ , R ₆ , and R ₇
And the transmission line.

Now, a case where a short-circuit accident occurs in the section III, the circuit breaker CB1 trips, and the circuit is not closed again will be described. If the circuit breaker CB1 trips, the sections I, II, and III that have been supplying power via the distribution line F ₁ will have a power outage. Then, in the normally open point slave stations R ₃ and R ₆ which are connected to the distribution line F ₁ ,
The power failure detection circuit 2 shown in FIG. 1 detects a power failure, and the timed progressive control circuit 3 starts timed counting.

Here, in the case where the permanent failure is confirmed in advance in the section III, when the master station M transmits the normally open point simultaneous lock command, the receiving circuit 1 receives the signal at the normally open point and the lock circuit 6 receives the signal. Output to

However, if there is a failure in the master station and the transmission line, and this control is disabled, the slave station outputs the output from the signal diagnostic circuit 4 or the line disconnection detection circuit 5 to the lock circuit 6 and sets the time sequence. A lock signal is output to the transmission control circuit 3.

As a result, the time-period progressive control circuit 3 stops the time-period counting and stops the time-period progressive function, and does not output the closing output to the normally open switch (S3, S6 in this example).

As described above, according to this embodiment, even if a failure occurs in the master station and the transmission line, even if a permanent accident occurs in the distribution line system, the time-sequential forwarding function of the slave station at the normally open point is provided. It is possible to prevent expansion of the faulty section of the distribution line by preventing the power supply from being turned on.

[Effects of the Invention] As described above, according to the present invention, due to the failure of the master station and the transmission path, against a system accident that occurs when each slave station is not under the control of the master station, It is possible to prevent the expansion of the power outage section by stopping the timed progressive function of each slave station.

[Brief description of drawings]

FIG. 1 is a functional block diagram of an embodiment of a distribution line automation device according to the present invention, and FIG. 2 is a distribution system diagram for explaining an embodiment of the present invention. M ... main station _{F 1, F 2, F 3} , F 4 ... distribution line S ... section switch, R ... slave station ... transmission line, T _1, T ₂ ... power supply 1 ... reception circuit, 2 ... power failure detection Circuit 3 ... Timed progressive control circuit 4 ... Signal diagnostic circuit 5 ... Line disconnection detection circuit 6 ... Lock circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiromichi Sugawara, 1 Higashi-shinmachi, Higashi-ku, Nagoya, Aichi Chubu Electric Power Co., Inc. (72) Toshiaki Miyata, 1 Higashi-shin-cho, Higashi-ku, Nagoya, Aichi Chubu Electric Power Co., Ltd. (72) Inventor Takatsugu Nishikawa 1 Toshiba Town Fuchu, Tokyo Fuchu factory Ltd. (72) Inventor Hiroki Kono 1-1-1 Shibaura, Minato-ku, Tokyo Toshiba headquarters office (72) Inventor Teruo Murakami 1-2-1, Wadazaki-cho, Hyogo-ku, Kobe-shi, Hyogo Mitsubishi Electric Corporation Control Works (72) Inventor Masao Tsukada 1-1 Shinden Tanabe, Kawasaki-ku, Kawasaki-shi, Kanagawa Fuji Electric Co., Ltd.

Claims (1)

[Claims] 1. A multi-loop system in which a large number of distribution lines connected to a substation are divided into predetermined sections through normally-closed section switches, and the respective distribution lines are connected through normally-open switches. In addition, in the distribution line automation device in which a slave station is provided at each normally open point and is controlled from the master station via a transmission line, the master station normally operates for all normally open point slave stations. It has a function to output an open point simultaneous lock command, the normally open point slave station receives a normal open point simultaneous lock command from the master station, a power failure detection circuit for detecting a power failure of the distribution line, and the parent station. A detection circuit that confirms that normal reception from the master station cannot be performed due to a failure of the station and the transmission line, a time-forwarding control circuit that controls the switches by the output of the power failure detection circuit, and the normal open point simultaneous lock command Confirm the reception output and normal reception from the master station. Distribution line automated apparatus being characterized in that a locking circuit in which the timed progressive control circuit in any condition the output of the detection circuit output for outputting a lock signal to.