JPS6238932B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention automates normally closed sectional switches in a multi-loop power distribution system using a timed accident investigation device, and enables the normally open interconnected switches to be automatically controlled from a central control center using a telecontroller. This invention relates to a distribution line automation system that automatically disconnects faulty sections and transmits power to healthy sections.

There is a conventional distribution line automation system as shown in FIG.

In FIG. 1, A is a power supply bus of a substation, and a distribution line F1 is drawn out through a mustard disconnector 1 from the power supply bus A. Distribution line F1 is normally closed sectional switch S1
〜S1, a normally open interconnection switch L1,
Power is supplied to sections #1 to #6 up to L2 and L3.

Sections #2, #4, #6 are normally open interconnection switches L
1, L2, L3 to other distribution lines F2, F3,
Connected to F4.

In addition, the normally closed sectional switches S1 to S5 are equipped with timed accident investigation devices T1 to T5 with a progressive function, and when voltage is applied to the power supply side, the power supply side The circuits are closed one after another, the line breakers 1 are opened, and the circuits are opened all at once when the line becomes non-voltage.

For example, if a ground fault Fa occurs in section #3, a ground fault relay (not shown) on the substation side will operate,
The line breaker 1 opens, and as a result, each section switch S installed on the distribution line F1 connected to the line breaker 1 opens.
1 to S5 are opened all at once.

When the shield breaker 1 opens, a re-closing device (not shown) on the substation side is activated, and after a predetermined time period, the shield breaker 1 recloses the circuit. As a result, section #1 is energized, and the section switch S1 is closed after a certain period of time by the function of the time-limited accident investigation device T1. This operation charges section #2, so
The sectional switch S2 closes by the same operation as the sectional switch S1. If the ground fault Fa that occurred in section #3 continues as described above, the ground fault relay at the substation will operate again immediately after the sectional switch S2 closes, opening the breaker 1. As a result, the power distribution F1 becomes a no-voltage state, and the sectional switches S1,
S2 is also opened.

At this time, after closing, section switch S2 switches to section #3 on the condition that the line becomes voltage-free within a predetermined time period.
It determines that there is a fault point in the terminal and locks its own closing circuit.

Next, the breaker 1 closes the circuit again after a predetermined period of time, and the sectional switch S1
Close the circuit. As a result, section #2 is energized, but since section switch S2 is locked as described above, it does not close. In this way, only healthy sections #1 and #2 are charged.

However, in this case, the fault point is section #3, and no electricity is applied to sections #4, #5, and #6 even though they are healthy.

Therefore, in such a conventional distribution line automation system, after the automatic operation, a worker is dispatched to the site and manually closes the interconnection switch L3, and then manually closes the sectional switch S5. The circuit is closed and sections #6 and #5 are connected to another distribution line F4 for load accommodation, and the interconnection switch L2 is manually closed to connect section #4 to another distribution line F3. I tried to accommodate the load.

In this conventional method, electricity is automatically charged to healthy sections on the power supply side from the fault section, but electricity is charged to healthy sections on the load side from the fault point by manual operation at the site, which is a hassle. was.

Furthermore, in other conventional distribution line automation systems, a method as shown in FIG. 2 has also been adopted.

In FIG. 2, the same parts as in FIG. 1 are given the same symbols and their explanations will be omitted. Each section switch S1~
Teleconverter slave station devices TCS1 to TCS5 and TCL1 to TCL3 are attached to S5 and the interconnection switches L1 to L3, respectively, for controlling the switches according to control commands from the central control center 3, and central control is carried out via the communication line L. It is connected to the central control device 2 of the station 3.

is a transmission means for transmitting information such as the status of the substation and the operating status of disconnectors to the central control center 3. Although not shown in the figure, it is generally a direct transmission method using a communication line, a information transmission device (CDT), or a supervision device (SV). ) etc. will be installed. The central control device 2 switches the sectional switch S1 according to the operating state of the substation switch.
This is a device for remotely controlling S5 and interconnection switches L1 to L3, and is composed of a computer or hard logic device.

The control commands from the central control device 2 to the teleconverter slave stations are assigned a frequency for each teleconverter, encoded, etc., so that only the relevant switch can be controlled individually. It's summery. Basically, this system attempts to individually control all the sectional switches and interconnected switches from the central control center 3.

For example, when a ground fault Fa occurs in section #3, as explained in FIG. Each section switch S1~
S5 opens all at once.

Next, after a certain period of time, the shield breaker 1 recloses the circuit, and section #1 is energized. The central control device 2 of the central control center 3 inputs a series of operating states of the shield breaker 1 via the communication means, and after the shield breaker 1 has reclosed, it transmits the teleconverter slave station device TCS 1 after a certain period of time.
A closing command is sent to the section switch S1 to close the section switch S1. As a result, section #2 is charged.

Next, the central control device 2 transmits a closing command to the teleconverter slave station device TCS2 after a certain period of time, and closes the section switch S2. If the ground fault Fa that occurred in section #3 continues as described above, the line breaker 1 will open again immediately after the sectional switch S2 closes, and the distribution line F1 will be in a no-voltage state. Therefore, the section switches S1 and S2 are also opened.

Next, the breaker 1 closes the circuit again after a predetermined period of time, and the sectional switch S1
Close the circuit. Here, the central control device 2 causes the sheath breaker 1 to close within a certain period of time after closing the sectional switch S2.
On the condition that the circuit is open, it is determined that there is an accident point in section #3, and for section switch S2,
Do not send input command. In this way, only healthy sections #1 and #2 are charged.

Next, the central control device 2
Closing commands are sequentially transmitted to TCL3 and TCS5, and interconnection switch L3 and section switch S5 are sequentially closed. As a result, sections #5 and #6 are also charged. Next, the central control device 2 is a teleconverter slave station device.
A closing command is sent to TCL2, and connection point switch L2 is closed to energize section #4. In this case, the hassle of manual operation on site is eliminated, but it is necessary to install a teleconverter slave station device for each sectional switch or interconnection switch, and the control code must be coded for each teleconverter slave station device. In some cases, it was necessary to allocate multiple frequencies, allocate different frequencies to all frequencies, complicate the control equipment, and in some cases install many communication lines.

Furthermore, since the control device controls all the sectional switches and interconnection switches, the control decision function becomes complex, and there is a risk that the control device will not be able to respond in the event of multiple accidents.

The present invention was made in order to eliminate the above-mentioned drawbacks all at once.
The purpose of the present invention is to obtain a distribution line automation system that can isolate faulty sections and transfer load to healthy sections without installing a large number of communication lines.

The present invention will be described below with reference to the drawings.

FIG. 3 is a configuration diagram showing one embodiment of the present invention, and A
is a power supply bus of a substation, and a distribution line F1 is drawn out from the power supply bus A through a mustard disconnector 1. The distribution line F1 is divided by normally closed section switches S1 to S5, and supplies electricity to sections #1 to #6 up to normally open interconnection switches L1, L2, and L3.

Sections #2, #4, #6 are normally open interconnection switches L
1, L2, L3 to other distribution lines F2, F3,
Connected to F4.

In addition, the sectional switches S1, S3, and S5 are equipped with time-limited accident investigation devices Ta1, Ta3, and Ta equipped with forward and reverse feed functions.
5 is attached, and when either the power supply side or the load side is energized and the other side is in a non-voltage state, the section switch is closed after a certain period of time, and the line becomes non-voltage within a certain period of time after closing. If this happens, the closing circuit of the sectional switch will be locked, and if either the power supply side or the load side is energized and there is no voltage again within a predetermined time period, the closing circuit of the sectional switch will be locked. It has a function to lock the

In addition, timed accident investigation devices Tb2 and Tb4 with a progressive function are attached to the segment switches S2 and S4,
A function that closes the sectional switch after a certain period of time when the power supply side is energized and the load side is in a no-voltage state;
It has a function that locks the closing circuit of the sectional switch if the line becomes non-voltage within a certain period of time after the circuit is closed.

Further, the normally closed sectional switches S1 to S5 are configured to open all at once when the line becomes non-voltage. The normally open interconnection switches L1 to L3 are attached with teleconverter slave station devices TCL1 to TCL3 for controlling the switches in response to control commands from the central control center 3. It is connected to the central control unit 2 of. is a transmission means for transmitting information such as the substation status and disconnection operating status to the central control device 2 of the central control center 3. Although not shown in the figure, it generally uses a direct transmission method using a communication line, a information transmission device (CDT), etc. Supervision equipment (SV) etc. will be installed.

The central control device 2 is a device for timely and remote control of the interconnection switches L1 to L3 according to the operating status of the substation's switches and disconnectors. The system is equipped with a function to sequentially turn on the normally open interconnection switches at fixed time intervals, from the one on the load side to the one on the load side from the accident area, depending on the accident area.

From central controller 2 to teleconverter slave station TCL1
-Control commands to TCL3 are now assigned by assigning a frequency to each teleconverter, or by coding and assigning a control code, making it possible to individually control only the desired interconnection switch. There is.

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

For example, if a ground fault Fa occurs in section #3, a ground fault relay (not shown) on the substation side will operate, opening circuit breaker 1, which will cause the distribution line connected to circuit breaker 1 to open. F1 becomes no voltage, and the distribution line F
Each of the normally closed section switches S1 to S5 installed on the top section 1 opens at the same time.

When the shield breaker 1 is opened, a re-closing device (not shown) of the substation is activated, and after a predetermined time period, the shield breaker 1 is reclosed. As a result, section #1 is energized and the time-limited accident investigation device with forward and reverse feed function is charged.
After a certain period of time due to the function of Ta1, section switch S1
Close the circuit. As a result of this operation, the section #2 is energized, so the section switch S2 is closed by the function of the time-limited accident investigation device 8b2 with a selection sequential function.

Here, as mentioned above, the ground fault occurred in section #3.
If Fa continues, immediately after the sectional switch S2 is closed, the substation's ground fault relay will operate again and open the circuit breaker 1, so the distribution line F1 will be in a no-voltage state and the sectional switch S1, S2 is also opened.

At this time, the section switch S2 determines whether there is a fault point in section #3 and locks the closing circuit on the condition that the line becomes non-voltage within a predetermined time period after closing. Further, the closing circuit of the divisional switch S3 is also locked by the function of the time-limited accident investigation device Ta3 with a forward/reverse feed function.

Next, the breaker 1 closes the circuit again after a predetermined period of time, and the sectional switch S1
Close the circuit. As a result, section #2 is energized, but since section switch S2 is locked as described above, it does not close. In this way, power is first applied to healthy sections #1 and #2. The central control device 2 of the central control center 3 inputs a series of operating conditions of the shield breaker 1 via the communication means, and after completing the above series of operations, sends a closing command to the teleconverter slave station device TCL3. Then, the interconnection switch L3 is closed.
As a result, section #6 is charged with load accommodation from another power distribution line F4, and the section switch S5 is closed after a certain period of time by the function of the time-limited accident investigation device Ta5 having a forward and reverse transmission function. With this operation, section #5
However, since the section switch S4 has only a forward feed function and does not have a reverse feed function, it does not close.

Next, the central control device 2
A closing command is sent to TCL2 and the interconnection switch L2 is closed. As a result, section #4 is charged with load accommodation from another power distribution line F3.

Here, since the section switch S3 is locked as described above, it does not close. Furthermore, since the load side of the sectional switch S4 is already energized, it does not close. As a result, only section #3, which is the accident section, loses power, and other healthy sections #1, #2, #4,
#5 and #6 are all charged with electricity.

In the above embodiment, for convenience of explanation, the distribution line is divided,
Although we explained the interconnection using a 6-division 3-interconnection system, in any multi-loop distribution system, a teleconverter slave station device is attached to the normally open interconnection switch so that it can be controlled from the central control center and normally closed. The present invention can be carried out by appropriately attaching a forward-travel time-limited accident investigation device or a forward-reverse transmission time-limited accident investigation device to the divisional switch.

In addition, although communication lines were used in the above embodiments as a means of communication between the central control unit and each teleconverter slave station device, it is also possible to use a so-called power distribution line carrier method or a wireless method that uses power distribution lines as communication paths. You can also do it.

In addition, the present invention can be modified and implemented in various ways without changing the spirit thereof.

As described above, according to the present invention, control from the central control center only needs to target the interconnection switches, and since each section switch is locally controlled according to the track condition, the control from the central control center The function of the control device is relatively simple, and it is possible to provide a distribution line automation system that can automatically disconnect faulty sections and transfer load to healthy sections without human intervention.

[Brief explanation of the drawing]

FIGS. 1 and 2 are block diagrams illustrating a conventional distribution line automation system, and FIG. 3 is a block diagram showing an embodiment of the present invention. A...Power busbar, 1...Shipping switch, 2...Central control device, 3...Central control center, F1 to F4...Distribution line, S1
~S6...Normally closed section switch, L1-L3...Normally open section switch, T1-T5...Sequential feed time-limited accident investigation device,
TCS1 to TCS5... Teleconverter slave station device (for sectional switch), TCL1 to TCL3... Teleconverter slave station device (for interconnection switch), L... Communication line, Ta1, Ta3, Ta5
...Timed accident investigation device for forward/reverse feed, Tb2, Tb4...Timed accident investigation device for forward feed.

Claims (1)

[Scope of Claims] 1. A multi-loop system divided into multiple sections by normally closed sectional switches, and each section is provided with an appropriate normally open interconnection switch so that power can be transmitted from other distribution lines in a timely manner. In the electric cable, each normally open interconnection switch is attached with a teleconverter slave station device and connected to the central control unit of the central control center by communication means, so that it can be controlled individually from the central control center, and each normally closed section The switch is attached with a timed accident investigation device for forward transmission or a timed accident investigation device for forward and reverse transmission, and by making it locally controllable depending on the electrification status of the line, it is possible to isolate the fault point, A distribution line automation system that automatically transmits power to healthy sections. 2. The central control device has the function of sequentially closing the normally open interconnection switches connected to the faulty distribution line at fixed time intervals, from the one on the load side to the one on the load side from the faulty section, depending on the faulty section. The distribution line automation system according to claim 1, characterized in that it has the following.