JPH0582134B2 - - Google Patents

Description

[Detailed description of the invention]

【0001】

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power distribution system operating device that checks the validity of power distribution system operation commands to improve the reliability and safety of power system operation.

[0002]

2. Description of the Related Art FIG. 1 shows a typical configuration example of a power distribution system configured into a multi-loop system by suitably connecting a large number of feeders connected to a substation and a disconnector. In FIG. 1, power distribution system breakers 1a, 1b, feeders 2a, 2b, division point switches 3a, 3b, 3c, 3d, connection point switches 4
a, 4b, 4c, 4d, 4e, section 5a, 5b,
5c, 5d, 5e, 5f, 5g, 5h, 5i and bus bar 6 as shown. In this configuration, normally the division point switch 3 is normally closed and the connection point switch 4 is normally open to operate in a radial system. The reason why the power distribution system is configured so that it can be looped is to minimize the number of power outage sections due to construction work in some sections or switching of switches in the event of an accident.

[0003] For example, in the system shown in Fig. 1, power is normally exchanged from the feeder 2b in sections 5f, 5g, and 5h, but if an accident occurs in section 5f, the disconnector 1b and the division point switches 3c, 3d are opened,
Sections 5g and 5h are not accident sections (referred to as healthy sections), but are in a power outage state. At this time, if the connection point switch 4c and division point switch 3d are turned on in sequence,
Electric power can be shared between healthy sections 5g and 5h.

[0004] However, as the number of flexible sections from the feeder 2a increases, the current flowing through the feeder 2a increases, so the feeder 2a may become overloaded. In other words, the connection point switch 4c is turned on and the section 5
This means that the method of accommodating power to the terminals g and 5h is inappropriate. In that case, it is conceivable to turn on the connection point switch 4b and to provide accommodation from a feeder (not shown) to which the section 5i belongs.

[0005] FIG. 2 shows a configuration example of a conventional power distribution system operating device. In FIG. 2, the same reference numerals as in FIG. 1 indicate the same elements as in FIG. In the figure, 7a, 7b, 7c,
7d and 7e are remote monitoring and control device slave stations (hereinafter referred to as TC slave stations), and 8 is a remote monitoring and control device master station (hereinafter referred to as TC slave stations).
(referred to as the TC master station), 9 is a system display device, and 10 is an operation console.

[0006] In such a configuration, the breaker 1a,
1b, segmentation point switches 4a, 4b, 4c, 4d, 4
The opening/closing state of the feeders 2a and 2b and the value of the current flowing through the feeders 2a and 2b are displayed on the system display device 9 via the TC slave stations 7a to 7e and the TC master station 8. Furthermore, when a disconnector or switch and its operation (opening or closing operation) are instructed from the console 10, the signal is transmitted to the TC master station 8. Then, an open or close signal is transmitted from this master station 8 to the TC slave station 7 corresponding to the breaker or switch specified on the console 10, and this opens the breaker or switch. Or thrown in.

【0007】

[Problems to be Solved by the Invention] However, in such conventional power distribution system operating devices, when it becomes necessary to switch the switch due to construction work or an accident in a part of the system, the operator cannot operate the switch at the operating console. Opening/closing instructions are given from No. 10, but this involves the following risks. In other words, if a section that was previously in a power outage state is charged by turning on the switch based on the instruction, there is a risk that an overload will occur in the feeder supplying power to that section. Therefore, it is necessary for the operator to be familiar with the target system to be operated. Furthermore, even if an operator makes a mistake (an operation that causes an overload), this will not be discovered until a system abnormality occurs, which could impair reliability and safety. There were problems with system operation.

[0008] The present invention improves the reliability and safety of power distribution system operation by notifying the operator that an overload will occur before the operator actually issues a power-on command. An object of the present invention is to provide a power distribution system operating device that can perform the following operations.

【0009】

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a power distribution system in which feeders connected to a disconnector at an electric station are connected by a section switch and a connection point switch. In a distribution system operation device that operates by closing or opening the above-mentioned cutoff switch or each switch based on an operation command, when a certain section of the distribution system has a power outage due to an accident or construction, the system status immediately after the power outage is , a first storage means for storing the connection feeder and section of the breaker and the current opening/closing state, and a second storage means for storing the two sections connected to the section switch or the connecting point switch and the current opening/closing state. means, a third storage means for storing the allowable current of the feeder, and a fourth storage means for storing the current state of each section, the power supply side section and the load current, and these first to fourth storage means. When a closing command is given to the corresponding connection point section switch based on the system status stored in each of the above, it is possible to determine which feeder is currently receiving power from the information in the first and second storage means. Based on the information in the first storage means and the fourth storage means, it is determined whether or not the section currently in a power outage state will be brought into a charging state by turning on the connecting point division switch. If so, determine which feeder is supplying power from the feeder currently receiving power, and calculate the current value flowing through this feeder from the sum of the load currents of each power supply side section. From the value, estimate the current that flows after the connection point division switch is turned on, and determine whether this current exceeds the allowable current based on the information in the third storage means. If it does, overload is detected. The apparatus is provided with an overload determining means which determines that an overload has occurred and outputs an alarm signal, and if the overload has not been exceeded, determines that no overload has occurred and outputs a closing command to the connection point divisional switch.

【0010】

[Operation] In the power distribution system operating device configured as described above, when an operation command is input to the overload determination means,
This overload determination means determines the system status immediately after a power outage occurs in a certain section of the distribution system due to an accident or construction work, and determines the connection between the connection feeder of the disconnection switch, the section, the current open/close status, and the section switch or connection point switch. It stores the two sections, the current open/close status, the allowable current of the feeder, the current status of each section, the power supply side section, and the load current, and determines which feeder is currently receiving power based on this stored information. , whether the section currently in a power outage state will enter a charging state by turning on the connection point division switch, and if it becomes a charging state, which feeder will supply power, and then Estimates the current that flows after the connecting point division switch is closed based on the current value, determines whether this current exceeds the allowable current, and if it does, determines that an overload has occurred and outputs an alarm signal. However, if the overload is not exceeded, it is determined that no overload has occurred and a closing command is output to the connection point division switch, so this operation will cause an overload to occur before the operator actually gives the closing command. It becomes possible to notify the operator of the situation, and as a result, reliability and stability when operating the power distribution system can be improved.

[0011]

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

[0012] FIG. 3 shows an example of the configuration of the power distribution system operating device according to the present invention. In FIG. 3, the same parts as in FIG. . That is, FIG. 3 shows an arrangement in which an overload determination device 11 is provided in addition to FIG. 2. This overload determination device 11
Based on the status of the power distribution system inputted via the TC slave stations 7a to 7e and the TC master station 8, the system simulates the system after operation based on the operation command from the console 10 and determines whether overload has occurred. However, if it is determined that an overload has occurred, an alarm signal to that effect is given to the console 10. Note that the overload determination device 11 can be implemented as a program using an electronic computer.

[0013] Next, the operation of this device will be explained. The status of the power distribution system is TC slave stations 7a, 7b, 7c,
7d, 7e, system display device 9 via TC master station 8
What is displayed is the same as in the conventional method, but it is also input to the overload determination device 11 at the same time. On the other hand, the operation console 10 performs the opening and closing operations of the disconnector and the switch.
When an instruction is given from , the operation command is transmitted to the overload determination device 11, and it is determined whether or not an overload will occur due to the instructed operation (particularly the closing operation). As a result, when it is determined that the instructed operation will cause an overload, an overload occurrence alarm signal is transmitted to the operation console 10, and the instructed operation is not transmitted to the TC master station 8.

[0014] Below, regarding the specific effects of the overload determination device, after an accident occurs in section 5f,
The case where power is transmitted to healthy sections 5g and 5h will be explained as an example. Now, the system status immediately after the accident in section 5f is stored in a storage unit (not shown) in the form shown in Table 1, Table 2, Table 3, and Table 4, respectively.

[0015] Table 1 is a table showing the feeder and compartment to which the chopper or disconnector connects and the current state, and Table 2 is a table showing the current state and the two compartments to which the section switch or connection point switch is connected. . From Tables 1 and 2, it can be seen that there is no section currently receiving power from the feeder 2b, but only a section receiving power from the feeder 2a.

[0016] Table 3 is a table showing the allowable current of the feeder. The value of the current actually flowing through the feeder is
It is constantly transmitted via the TC slave station 7 and the TC master station 8, and when this value exceeds the allowable current, it is determined that there is an overload. The feeder allowable current is determined at the time of equipment installation.

[0017] Table 4 is a table showing the current state of the section (power outage or charging), the power supply side section, and the load current.

[0018] In the above, the power supply side section of a section refers to the section that is transmitting power to the section, and if you follow the power supply side sections one after another, you can find out the feeder that is transmitting power to the section. For example, the power supply side section of section 5c is section 5b.
The power supply side section of section 5b is section 5a, and the power supply side of section 5a is bus bar 6, that is, section 5a.
It can be seen that is the section directly connected to the feeder. Therefore, when looking at Table 1, it can be seen that the section 5a is connected to the feeder 2a, so it can be seen that the section 5c is connected to the feeder 2a after all.

[0019] Note that the power supply side section has no meaning with respect to the power outage section, so it is indicated by one. Moreover, the power supply side section marked with * indicates that it is a section not shown in FIG. 3 . Furthermore, the load current of a section is the current consumed by the load within the section, and this load current can be determined from the sum of the contracted power of the consumers included in the section.

[0020] In the current state shown in Tables 1, 2, and 3, it is assumed that the operator issues a closing command for the connection point switch 4c from the console 10. Upon receiving this command, the overload determination device 11 detects the connection point switch 4
It is determined as follows whether or not overload will occur due to the input of c. That is, although the section 5g is currently in a power outage state, it can be seen from Tables 1 and 4 that the section 5b becomes a charging state as a power supply side section by turning on the connection point switch 4c. Then, as mentioned above, if we follow the power supply side sections of section 5f sequentially, section 5
It can be seen that the feeder that supplies power to b, that is, section 5g, is feeder 2a. The current value currently flowing through this feeder 2a is TC slave station 7a, TC
It is transmitted via the master station 8, which is denoted by I. This I is the section 5a, 5 connected to the feeder 2a.
It is the sum of the load currents of b and 5c. On the other hand, the current flowing through the feeder 2a after the connecting point switch 4c is turned on is
If I', then it can be estimated that I' = I + (load current in section 5g). When this current I' exceeds the allowable current of the feeder 2a shown in Table 3, it is determined that an overload has occurred, and the overload determination device 1
1 transmits an overload occurrence alarm signal to the console 10. Further, when the current I' does not exceed the allowable current of the feeder 2a, it is determined that no overload has occurred, and a closing command for the connection point switch 4c is transmitted to the TC master station 8.

[0021] Next, from the operation console 10, the division switch 3d
When the closing command is given, the overload determination device 11 that received this command does the same as in the case of the connection point switch 4c, and if it determines that no overload has occurred, it instructs the TC master station 8 to close the division point switch 3d. Transmit the input command.

[0022] In this way, a multi-loop system is constructed by connecting a large number of feeders 2a and 2b connected to the insulation and disconnectors of the electric station by the division point switches 3a to 3d and the connection point switches 4a to 4e. The power distribution system is connected to the above-mentioned power disconnector 1 based on the operation command from the operation console 10.
a, 1b, and each switch 3a to 3d, 4a to 4e, by closing or opening the TC slave stations 7a to 7.
e. An overload determination device that simulates the system after operation based on the state of the power distribution system inputted via the TC master station 8 prior to the actual power-on command based on the power-on command, and determines whether an overload has occurred at that time. 11, and if it is determined that an overload has occurred, an alarm signal is output.

[0023] Therefore, if an overload occurs, the operator is notified of this by an alarm signal, and
Since operation commands are not transmitted from the TC master station 8 to the TC slave stations 7a to 7e, even operators who are not as familiar with the system as in the past can operate the system with peace of mind, and when performing power distribution system operations. can increase reliability and stability.

【0024】

Effects of the Invention As described above, according to the present invention, the system after operation is simulated prior to the actual closing command, and it is determined in advance whether or not an overload has occurred at that time. If it is determined that there is an overload, a warning signal is output, so the operator can be notified that the operation will cause an overload before the operator actually issues a closing command. Therefore, it is possible to provide a power distribution system operating device that can improve the reliability and safety of power distribution system operation.

【0025】

[Table 1] ■■■ Turtle shell [0001] ■■■ ■■■ Turtle shell [0002] ■■■

[0026]

[Table 2] ■■■ Turtle shell [0003] ■■■

[0027]

[Table 3] ■■■ Turtle shell [0004] ■■■

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing a typical power distribution system.

FIG. 2 is a diagram showing a configuration example of a conventional power distribution system operating device.

FIG. 3 is a configuration diagram showing an embodiment of a power distribution system operating device according to the present invention.

[Explanation of symbols]

1a, 1b...Shiya disconnector 2a, 2b... feeder 3a to 3d...Separation point switch 4a to 4e...Connection point switch 5a-5j……section 6...Bus line 7a to 7e... Remote monitoring and control device slave station 8... Remote monitoring control device master station 9...System display device 10...Operation console 11... Overload determination device.

Claims (1)

[Claims] Claim 1: A power distribution system in which feeders connected to a breakout switch of an electric station are connected by a section switch and a connection point switch is connected to the breakout switch and each switch based on an operation command. In a distribution system operation device that is operated by turning on or off, when a certain section of the distribution system has a power outage due to an accident or construction, the system status immediately after the power outage includes the connection feeder and section of the disconnector, and the current open/close status. a first storage means for storing the two sections to which the section switch or the connecting point switch connects and the current switching state; a third storage means for storing the allowable current of the feeder; Each has a fourth storage means for storing the current state of each section, the power supply side section, and the load current, and the corresponding connection point is based on the system state stored in each of the first to fourth storage means. When a section switch closing command is given, it is determined from the information in the first and second storage means which feeder is currently receiving power supply, and the first storage means and the fourth storage means are Based on the information in the storage means, it is possible to determine whether or not the section currently in a power outage state will be brought into a charging state by turning on the connection point division switch, and if it is in a charging state, which feeder will supply power. At the same time, the current value flowing in this feeder is determined from the sum of the load currents of each power supply side section, and from this current value, the current flowing after the connection point division switch is turned on is estimated. Then, it is determined whether this current exceeds the allowable current based on the information in the third storage means, and if it exceeds the allowable current, it is determined that an overload has occurred and an alarm signal is output; A power distribution system operating device characterized by comprising overload determining means for determining that no overload has occurred and outputting a closing command to the connection point division switch.