JPH0636652B2 - Distribution line automation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention relates to a distribution line automation device for controlling a plurality of switches provided in a distribution line.

(Prior Art) A large number of distribution lines connected to a substation are appropriately connected to each other to form a distribution system as a multiple loop configuration. In these distribution systems, a normally closed switch and a time-advancing device are arranged in combination at each division point, and a normally-open switch and a time-delay device are arranged in combination in each of these division points. , It is considered that the disconnection of the accident section and the load accommodation for the healthy section after the accident section are enabled and the blackout of each section is minimized.

In the above system, the time-forwarding device used at each normally open point in combination with the normally open switch controls the switch by using the presence or absence of distribution line voltage on both sides of the normally open point as an information source and an operating power source. Therefore, it is premised that the circuit breaker circuit breaker must be reclosed and reclosed 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.

Therefore, in such a case, if the function is not stopped for each normally open point, the time-forwarding device of such normally open point will normally open if no voltage is applied to one side for a certain period of time. There was a risk that the switch would be turned on and the spread of the accident would be expanded.

For this reason, conventionally, 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 connected to the central master station by a transmission line. ,
By transmitting a normally open point simultaneous lock command from this master station, the timed progressive function at each normally open point is stopped.

(Problems to be Solved by the Invention) In the above-mentioned conventional method, not only the normally open point that is connected to the distribution line that is in power outage due to an accident, but also the time limit of each normally opened point that is connected to other distribution lines. The progressive function also stops, and if an accident occurs in which the circuit is reclosed by another distribution line, the original normal operation cannot be achieved.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a distribution line automation device capable of stopping only a time-forwarding function of a normally open point that is connected to a distribution line during a power failure. I am trying.

[Structure of the Invention] (Means for Solving Problems) Referring to FIG. 1 corresponding to the embodiment, in the present invention, the master station M is normally open to all normally open points slave stations R. The normally open point slave station R has a function of outputting a point simultaneous lock command, the receiving circuit 1 for receiving the normally open point simultaneous lock command from the master station, and the power failure detection circuit 2 for detecting a power failure of the distribution line.
And the timed progressive control circuit 3 for controlling the switches by the output of the power failure detection circuit, and the timed progressive control circuit on condition that the reception output of the normally open point simultaneous lock command and the output from the power failure detection circuit are present. And a lock circuit 4 for outputting a lock signal.

(Function) Considering the case where a short circuit accident occurs in the distribution line, a distribution line protection relay (not shown) at 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-limited 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 sends a normally open point simultaneous lock command to all normally open point slave stations, the receiving circuit 1 receives the command. In this case, the lock circuit 4 detects that the power outage is detected by the power outage detection circuit 2, and outputs.
Based on the AND condition that the receiving circuit 1 receives the normally open point simultaneous lock command, a lock signal is output to the timed progressive control circuit 3.

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, and FIG. 2 is a distribution system diagram. First
In the figure, M is a master station, R is a slave station, and these are transmission lines l.
Connected by. And, FIG. 1 shows one of R ₃ , R ₆ and R ₇ shown as a normally open switch in FIG. 2 as a representative example. S is a normally open switch, and the distribution lines F ₁ and F ₂
And are interconnected.

T ₁ and T ₂ are power supply devices to the slave station R connected to the distribution lines F ₁ and F ₂ . 1 is a receiving circuit that receives a normally open point simultaneous lock command from the master station M, and 2 is a power failure detection circuit that detects a power failure of the distribution lines F ₁ and F ₂ by the secondary outputs of the power supply devices T ₁ and T _2. , Power failure detection circuit for detecting power failure of distribution line F ₁
2-1, power failure detection circuit 2-2 for detecting power failure of distribution line F ₂ ,
And OR circuit that outputs under the OR condition of power failure detection circuits 2-1, 2-2 2-
It consists of three.

Reference numeral 3 is a time-sequential forwarding control circuit for controlling the normally open switch S depending on the presence or absence of the output of the power failure detection circuit 2-1, 2-2, which is a distribution line F ₁ or F ₂
When no voltage is applied, the time count is performed and the closing output is output to the normally open switch S.

Reference numeral 4 denotes a lock circuit, which is a timed progressive control circuit 3 under the AND condition of the output of the power failure detection circuit 2 and the output of the reception circuit 1.
In response, a lock signal is output.

Fig. 2 is a distribution system diagram. CB1, CB2, CB3, and CB4 are breakers for extracting distribution lines at substations, and are distribution lines F ₁ and F, respectively.
₂ , F ₃ , F ₄ are pulled out. And, S1, S2, S4, S5 in the distribution line are normally closed switches, S3, S6, S7 are normally open switches. The details are as shown in Fig. 1, and the distribution lines are As shown in the figure, it is divided into sections I ... VI.

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 ,
It is configured to retract into R ₆ and R ₇ .

Next, the operation of the embodiment having the above configuration will be described. In this case, a case where a short circuit accident occurs in section III and the circuit breaker CB1 trips and does not close again will be described.

First, the breaker CB1 is tripped, interval I which is supplying power through the distribution line F _1, II, III will be blackout. Then, in the slave stations R ₃ and R ₆ at the normally open points connected to the distribution line F ₁ , the power failure detection circuit 2 detects a power failure, and the timed progressive control circuit 3 starts timed counting.
At this time, when the normally open point simultaneous lock command is received from the master station M, the receiving circuit 1 receives the signal at the normally open point and outputs it to the lock circuit 4. The lock circuit 4 detects that a power failure has been detected by the power failure detection circuit 2 and that there is an output, and that the reception circuit 1 has received the normally open point simultaneous lock command. Output a lock signal. 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 S. On the other hand, the slave station R _{7 of} the other normally open switch S7 also receives the normally open point simultaneous lock command from the master station M, similarly to the slave stations R ₃ and R ₆ described above. Since the distribution lines F ₂ and F ₄ on both sides of S7 are sound, the lock condition is not established and the timed progressive function is not stopped.

As described above, according to the present embodiment, the time-limited forward function of the normally open point interconnected between the sound distribution lines is not impaired, and the time limit of the normally open point interconnected to the blackout distribution line is not impaired. Only the progressive function can be stopped.

The transmission line provided between the master station and the slave station is not particularly limited, but any means such as a communication cable, a distribution line, a coaxial cable, or an optical cable may be used.

Furthermore, the present invention can be implemented in an integrated remote control system including a normally open switch and a normally closed switch.

[Effects of the Invention] As described above, according to the present invention, the timed progressive function is locked by using the normally open point simultaneous lock command from the master station and the power failure signal of the distribution line. A distribution line automation device that can stop only the normally open time delay forward function that is connected to the distribution line during a power failure without damaging the normally open time delay forward function that interconnects the wires. Can be provided.

[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 the operation. M ...... master station _{F 1, F 2, F 3} , F 4 ...... distribution line S ...... section switch, R ...... slave station l ...... transmission _{line, T 1,} T ₂ ...... power supply 1 ... … Reception circuit, 2 …… Power failure detection circuit 3 …… Timed progressive control circuit 4 …… 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 Hiroki Kono 1-1-1, Shibaura, Minato-ku, Tokyo Inside Toshiba Headquarters office (72) Inventor Takeo Toda 1 Toshiba Town, Fuchu-shi, Tokyo Inside the Toshiba Fuchu factory (72) Inventor Yoshiro Noguchi 1-2-1 Wadazaki-cho, Hyogo-ku, Kobe-shi, Hyogo Inside Mitsubishi Electric Co., Ltd. (72) Inventor Satoshi Shimomura 1-1, Tanabe-shinden, 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 switches and the distribution lines are connected through normally open switches. In addition to configuring, in the distribution line automation device that has a slave station at each normally open point and is controlled from the master station via the transmission line,
The master station has a function of outputting a normally open point simultaneous lock command to all normally open point slave stations, and the normally open point slave station receives a normally open point simultaneous lock command from the master station. A power failure detection circuit for detecting a power failure of the power distribution line, and a timed progressive control circuit for controlling the switch by the output of the power failure detection circuit,
A distribution line automation apparatus, comprising: a lock circuit that outputs a lock signal to the timed progressive control circuit on condition that the output of the normally open point simultaneous lock command is received and the output from the power failure detection circuit is present.