JPH0419783B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic operation system for a distribution line carrier transmitter, and aims to improve the efficiency of the transmitter by reducing the number of operations of a switch connecting the carrier transmitter and the distribution bus. The purpose is to increase reliability.

FIG. 1 shows an overview of the configuration of a conventional power distribution line carrier transmitter. In the figure, 1 is the main transformer of the substation, 2 is the distribution bus of the substation (hereinafter referred to as the substation bus), 3 is the circuit breaker, 4 is the distribution line, 5 is a switch such as a vacuum switch, and 6 is a switch. The transmitter 7 is a controller that controls the transmitter. There are usually about three main transformers 1 installed in a substation, and each main transformer has a power capacity of about 20 MVA. Power is supplied to each home or factory via a power distribution line 4 through a circuit breaker 3 . In the event of a ground fault, etc., each distribution line 4 is connected to the circuit breaker 3 by activation of the substation's protective relay.
This prevents accidents from spreading to healthy distribution lines. The transmitter 6 is connected to the power distribution bus 2 of the substation through the switch 5. A vacuum switch is usually used as the switch 5 in consideration of the number of operations and the like. Incidentally, although circuit breakers are excellent in reliability, they have a short lifespan in terms of the number of times they open and close, and cannot be used to connect a transmitter to a substation bus.

Further, most of the signals transmitted by the transmitter 6 flow into the main transformer 1. Therefore, in order for the transmitter to generate a signal voltage of several percent of the 60Hz commercial frequency voltage, it requires an output of several tens of KVA due to the low impedance of the main transformer.

Furthermore, the transmitter is connected to the substation bus 2 using a reactor and a capacitor, but the connection requires a large capacity of several 100 KVA.

Operation commands for the transmitter 6 are issued by a controller 7 located within the transmitter. Regarding the operation of the transmitter, there can be a major distinction between automatic operation and manual operation. Manual operation is performed without time restrictions.
The conventional method of automatic driving will be explained with reference to FIG.

In Figure 2, A, B, and C are automatic operation items,
V _s is the closing time of the vacuum switch 5, a ₁ to a ₃ , b ₁ to b ₃ ,
c ₁ to _{c 3} indicate the driving time of automatic driving items.
Items that are normally automatically operated include monitoring of distribution line switches, information on distribution line voltage and current, and load control for late-night power use. Depending on the item to be automatically operated, the timing and time interval of operation may not necessarily match. As shown in FIG. 2, each item is controlled by the controller at the required timing and at the set time to enter automatic operation, and the switch 5 repeats the closing operation each time. As mentioned above, the connection capacity and transmission capacity of the transmitter are very large, so reducing the number of times the switch 5 operates greatly contributes to improving the reliability of the transmitter operation.

The present invention aims to improve reliability by reducing the number of times the switch 5 operates, and an example of reducing the number of times the switch 5 operates will be described with reference to FIG.

In FIG. 3, A, B, and C are automatic operation items whose timing, time interval, etc. are predetermined, _Vs is the closing time of the vacuum switch 5, a ₁ to _{a 3} , b ₁ to b ₃ , and c ₁ to _c3 each indicate the driving time of the automatic driving item. A ₁ , b ₁ , and c ₁ of automatic operation items A, B, and C are items that are operated by the controller 7 within close time periods. A
The vacuum switch 5 is connected to the substation busbar due to the automatic operation in a ₁ , but the vacuum switch 5 remains connected even after the item in a ₁ is completed, and the next adjacent automatic operation item is connected. The automatic operation of _b1 of B is executed by the controller 7 when the time comes. Next, the same operation is repeated for _c1 of C, and at the end of the operation of _c1 , the vacuum switch 5 is opened from the substation bus. Similar operations are performed for a ₂ , b ₂ and c ₂ , a ₃ , b ₃ . While the number of operations of the vacuum switch 5 in FIG. 2 is eight, the number of operations in FIG. 3 can be reduced to three.

When the transmitter is connected to the substation bus in this way, the number of operations of the vacuum switch, which is most related to reliability, can be reduced, and reliability can be improved.

Next, an embodiment for shortening the time during which the transmitter is connected to the substation busbar, that is, the time during which the switch 5 is closed, will be described with reference to FIG.

In Figure 4, A, B, and C are automatic operation items,
V _s is the closing time of the vacuum switch, a ₁ ~ _{a 3} , b ₁ ~ b ₃ , c ₁
~ _c3 indicates the operating status of the automatic operation item. In this case, the number of operations of the vacuum switch can be reduced by adopting a method similar to the example of FIG. 3, but the total time that the transmitter is connected to the substation bus will be extended. This reduction in time is associated with increased reliability. Regarding the automatic driving items in use today, the set times for each item are not absolute, and even if the time deviates by about 5 minutes, for example, it will not be a big problem in practice. I know from experience that this often does not happen.

The present invention focuses on this point, and aims to minimize the time that the transmitter is connected to the substation bus by consolidating automatic operation items that are operated within a certain predetermined period of time into a concentrated period of time. It is something that can be done.

In Fig. 4, the vacuum switch is connected to the time substation bus of V _s by the automatic operation of a ₁ of A, and a ₁
The items are executed by the controller 7, b ₁ of B and c ₁ of C are executed after the completion of a ₁ within the specified time, and b ₁ and c ₁ are executed, and all execution is completed. Then, the vacuum switch is opened from the substation busbar.

That is, the time during which the switch 5 is connected to the system from the time the switch 5 is turned on in item _a1 is defined as 5 minutes. Then, B's scheduled within this time.
The scheduled time of b ₁ and c ₁ of C will be changed and b ₁ and c ₁ will be implemented following item a ₁ . onwards,
Perform the same procedure for a ₂ , b ₂ and c ₂ , a ₃ , b ₃ . This reduces the number of times the vacuum switch operates and also reduces the time the transmitter is connected to the substation bus.

Next, an embodiment in which there is an automatic operation scheduled within a predetermined time when manual operation is to be performed will be described with reference to FIG.

In Fig. 5, A is a manual operation item, B and C are automatic operation items, V _s is the operating time of the vacuum switch, a ₁ ,
b ₁ and c ₁ represent the operating time of each item, and T represents a predetermined time, for example, the above-mentioned 5 minutes. When A is, for example, an opening/closing control command for a pole-mounted switch, some commands are scheduled in advance, but in many cases, control commands are issued manually as needed and performed manually. Now, a ₁ of A's manual items
When driving according to the following content, if b ₁ of B, which is an automatic driving item, is scheduled within the specified time T, change the scheduled time of this b ₁ and execute the previous a ₁ . Followed by b ₁ . When this series of operations is completed, the vacuum switch is opened. Furthermore, even when the scheduled time for b ₁ arrives, b ₁ has already been executed, so it will not be executed at this point. Then, when the scheduled time of _c1 of C arrives, the vacuum switch is connected to the substation busbar and automatic operation is performed, but there is no next scheduled automatic operation item within the specified time T. Therefore, at the end of _c1 , the vacuum switch is opened to end this implementation.

According to this invention, the number of times the vacuum switch operates can be reduced, and the time that the transmitter is connected to the substation bus can be shortened, so that a highly reliable transmitter can be provided. It is.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the general configuration of an example of a conventional power distribution line carrier transmitter, Fig. 2 is an operation explanatory diagram showing a conventional example of automatic operation, and Fig. 3 is an example of reducing the number of times the switch 5 operates. FIG. 4 is an explanatory diagram of the operation of one embodiment of the present invention, and FIG. 5 is an explanatory diagram of the operation of another embodiment of the present invention. 1... Main transformer, 2... Distribution bus, 3...
...Breaker, 4...Distribution line, 5...Vacuum switch, 6
...Transmitter, 7...Controller, A, B, C...Operation items.

Claims (1)

[Claims] 1. In a transmitter that is equipped with a switch that connects the output of a carrier wave transmitter to a distribution bus, and that transmits a signal output by closing the switch each time it transmits, multiple operating items are transmitted at predetermined times and time intervals. When automatically transmitting, when one item for manual operation or automatic operation is sent, the schedule for other automatic operation items is subsequently changed and sent, and multiple items are sent during one switch closing period. An automatic operation method for a distribution line conveyance transmitter characterized by transmitting automatic operation items.