JPH0777489B2 - Distribution line load accommodation method - Google Patents

Description

The present invention relates to a distribution line load accommodating method, and particularly to a distribution line load accommodating method for preferentially recovering from a preferential power failure recovery section designated in advance at the time of a distribution line system accident. Regarding the method.

[Conventional technology]

The conventional distribution line load accommodation method is basically used in the case of a distribution line system accident, as described in JP-A-61-2455, reverse distribution line method, and JP-A-56-123741. ,
In the range of standby power that can be supplied from the distribution line that is directly connected to the healthy blackout section, turn on the link switch so that the power can be accommodated in the blackout section, and then for the blackout section where the power is not accommodated by the above operation. In order to relieve and average the reserve power of the interchange distribution line, the reverse transmission route is obtained from the substation (distribution line) with a large amount of reserve power, and the link switch that constitutes this reverse transmission route is input. Is the way to do it.

[Problems to be Solved by the Invention]

In the above-mentioned conventional technology, when a power failure occurs due to a distribution line system accident, priority is not given to restoration of important loads that have a great social impact due to a power failure, such as hospitals, fire departments, and police stations, and there is no consideration. The power outage load is set to the same weight, and the interchange path is calculated by the interchange calculation process for the entire distribution line system, and the interchange operation is performed. Due to this, there is a possibility that it may cause social confusion due to a long power outage, such as leaving a section to which an important load is connected as a power outage.

An object of the present invention is to provide a section in which a power outage is preferentially restored in a sound outage section (section in which a distribution line is healthy, but power transmission is impossible due to an accident in another section). For the distribution line that interchanges power with respect to, does not become overloaded, and searches for a flexible route that can supply power earliest,
The power failure in the priority power failure recovery section is restored by operating the switch on the route.

[Means for Solving the Problems]

The above-mentioned problem relates to the state of a distribution line system including a distribution line consisting of a plurality of sections connected to each other via a switch, and a plurality of power supply means connected to the distribution line to supply power. A distribution line load accommodating method for monitoring and controlling the switch to transmit power to a sound power failure section in the event of a distribution line power failure. Procedure for specifying the priority section for prioritizing restoration of power failure for each power distribution line in advance, and b. A procedure for extracting the priority section existing in the group of healthy blackout sections when a power line power failure occurs; A procedure for searching for an interchange route connecting the priority section and the power supply means; d. From the searched interchange route, the load connected to the interchange route and the priority section, a procedure for extracting an interchange route that does not exceed the reserve power amount that can be supplied by the power supply means connected to the interchange route, E. A distribution line load accommodation method comprising: a procedure of selecting an accommodation path that has the shortest operation time of a switch required to form the extracted accommodation path.

Further, in parallel with the formation of the accommodation route for supplying power to the priority section, the remaining section accommodation route is provided on the assumption that the accommodation route is formed for the remaining healthy blackout section where power is not supplied by the accommodation route. It is also effective to provide a distribution line load accommodation method that includes a procedure for searching and deciding, and that, following the completion of the formation of the accommodation path, performs a switch operation to form the search-determined remaining section accommodation route.

Further, the state of a distribution line system including a distribution line consisting of a plurality of sections connected to each other via a switch, and a plurality of power supply means connected to the distribution line to supply power, In a distribution line load accommodation method for controlling the switch to transmit power to a sound power failure section in the event of a power distribution line power failure, a. In advance, specify a priority section for each power distribution line that will be restored preferentially when a power failure occurs. For the designated priority section, search for an interchange route that will supply power in the event of a power outage in the distribution line, in advance corresponding to the section in which the accident occurred, and c. When a power failure occurs, the section where the accident occurred is detected and the interchange route is determined.

It can also be achieved by the distribution line loading method.

Furthermore, the total value of the load connected to the searched interchange route and the priority section, and the magnitude of the reserve power amount of the power supply means that interchanges the power to the interchange route, is constantly compared at a predetermined time interval, It is also effective to extract an accommodation route having a larger reserve power amount from the searched accommodation routes and to determine from the extracted accommodation routes when a power failure occurs.

[Action]

A priority section for recovering a power failure is designated preferentially, and at the time of a power failure, the priority section existing in a sound power failure section is extracted,
A flexible route that transfers power to this priority section is searched, and from the searched flexible paths, the size of the load connected to the flexible path and the priority section is a power supply unit that transfers power to the flexible path. The interchange route that does not exceed the reserve power of the device is extracted, and the interchange route that has the shortest operation time of the switch required to form the interchange route is selected from the extracted interchange routes. The switch is operated to form the path.

On the other hand, in parallel with the operation of the switch for the priority section power failure recovery, the accommodation path is formed for the remaining healthy power failure section where the power failure is not restored by the accommodation path formed by the operation of the switch. On the premise that the remaining section accommodation route is found, the remaining section accommodation route is searched and determined, and after the accommodation section for the priority section is formed, the switch operation for continuously forming the remaining section accommodation route is performed.

Also, when a power outage occurs in the distribution line to which the priority section belongs and other sections together with the designation of the priority section, a flexible route that allows power interchange is searched in advance. You can also choose from among these.

Further, the size of the load connected to the searched interchange route and the priority section, and the reserve power amount of the power supply means for accommodating power to the interchange route are compared at a predetermined time interval, and a search is performed. If a flexible route with a larger amount of reserve power is extracted from the flexible routes,
If one of the extracted flexible routes is selected, the time required for selection is shortened.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 2 to 5 and FIGS. 6a to 6c. The distribution line system shown in FIG. 2 is a distribution line F ₁
If, on該配wire F _1, linked switching device is a power supply means at the time of power interchange (hereinafter, abbreviated as TSW) 1 and the distribution line F ₂ which is connected via a TSW2, the distribution line F ₁ To TSW3 and
It comprises a distribution line F ₃ which is connected via TSW 4 and is connected to the distribution line F ₂ via TSW 5. Each distribution line F ₁ ,
F _2, and the feed end of the F _3, the feeder circuit breaker (hereinafter, FC
B and abbreviated) 1, FCB2 and FCB3 are provided respectively on the distribution line F ₁ between the FCB1 and TSW3 is Junto function with switch (hereinafter abbreviated as SW) SW11~SW16 of wiring lines It is installed by connecting each section to each other. For convenience of explanation, the FCB side of each distribution line is called the upstream side, and the TSW side is called the downstream side. Branch lines are provided in sections 12, 13 and 16 of sections 10 to 16 numbered from the upstream side of the distribution line separated by FCB1 and each SW and TSW3, and the branch line of section 12 is SW17. And TSW1 via section 17 and the branch line of section 13 is TSW18, section 18, T
The TSW4 is connected to the TSW4 via the SW19 and the section 19, and the branch line of the section 14 is connected to the straight line TSW2. In addition, the distribution line F ₂ between the the FCB2 TSW2, is installed SW21～23, FC
B2, SW21-23, and section 21 of the sections 20-23 numbered sequentially from the upstream side of the distribution line separated by TSW2 and
A branch line is provided at 23. The branch line of section 21 is SW25
And section 25 is connected to TSW1 via section 25, and the branch line of section 23 is connected to TSW5 via SW24 and section 24, respectively. Further arranged SW31~34 the distribution line F ₃ between FCB3 and TSW3, FC
Branch lines are provided in sections 31 and 33 of sections 30 to 34 numbered from the upstream handle of the distribution line sectioned by B3, SW31 to 34, and TSW3. The branch line of section 31 is TSW5 via SW35, section 35, SW36, and section 36, and the branch line of section 33 is TSW4 via SW37, section 37, SW38, and section 38
Respectively connected to.

In the distribution line system described above, a section in which an important load for which restoration from a power failure should be prioritized is connected is set as shown in Table 1.

When a voltage is applied to its power supply side terminal (upstream side), the switch SW with forward throw function has a preset sequence closing time (this time is called X time limit, generally between 0 seconds and 60 seconds). Is set (closed), but it is not closed even if a voltage is applied to the load side terminal (downstream side). Also, if the voltage runs out within a certain time after the power is turned on (called the Y time period, which is usually set to 0 to 5 seconds, which is shorter than the X time period of the SW on the downstream side), the power is locked so that the power can not be turned on. To be done. Further, when the power supply side has no voltage in the closed state, it opens immediately. With these functions, when a distribution line system accident occurs, the power supply to the section where the accident has occurred (accident occurrence section) is stopped.

The switch TSW for linking each distribution is normally open.

As shown in FIG. 1, each FCB, each TSW, and each SW is provided with a switch slave station S, and the open / close state of each breaker and each switch is determined by the signal transmission path 4 and the switch slave station S. It is also detected by the distribution line monitoring and control device 1 via this, and it is also possible to positively perform a control operation by the device 1 to perform the opening / closing operation. For the actual opening / closing operation, the transmission speed of the transmission system,
Considering the switch operating time and the interval between controls, it takes about 5 to 15 seconds per switch. A man-machine device 2 is further connected to the distribution line monitoring control device 1 so that an operator can perform various settings including the settings in Table 1 and control operations.

Power is supplied to each section of the distribution line via the FCB, but if a distribution line system accident such as a short circuit or a ground fault occurs in a section, the protection substation Ry operates to Trips, the power supply is cut off, and the distribution line receiving power from this FCB loses power, and the unpowered SW opens on the power supply side. The power supply cut off by the operation of the substation side is restarted by closing the FCB after a certain time (usually set after 10 to 30 seconds) by the operation of the substation side, and the power supply side of each SW. A voltage is applied to the switches, and the switches are sequentially closed after the X time limit set for each SW has elapsed.

An operation example of FCB and SW at the time of power failure will be described with reference to FIGS. 3 and 4 by taking the distribution line F _{1 of} FIG. 2 as an example. Each SW
Is set to the X time limit shown in Table 2.

In Fig. 3, section 14 divided by SW14, SW15, and TSW2
If a ground fault occurs at, the protection Ry (not shown) of F ₁ detects an overcurrent and FCB 1 trips. Distribution line
F ₁ becomes no-voltage open, SW11～19 is the open state, FCB 1 operates reclosing after about t ₁ hour, or less, as shown in Figure 4, the SW11 to SW14, set each SW It is closed every X time limit. The double line in Fig. 4 shows the closed state of FCB and SW, and the single line shows the open state.

FCB1 trips again because there is a ground fault in section 14 when SW14 is closed. As a result of this trip, SW14 is put into a non-voltage state within the Y time limit, and is locked. The accident section is judged by monitoring the opening / closing operation status of each SW and the closing time. FCB1 after re trip to the t ₂ hours (typically 30 to 60 seconds is set to) operates again re-closure,
The power supply side section is charged more than SW14, and finally the section 1
4, 15, 16 are blackout sections.

When the section of the distribution line F ₁ shown in FIG. 3 is a node and the switch is a branch and the section number (node number) is displayed in a circle, the distribution line F ₁ is represented as shown in FIG. The number attached to the outside of each circle is the load amount (the value of I _n in equation (1) described later) connected to each node, and the number written in () is via each TSW. The reserve power amount that can be exchanged from the other distribution lines F ₂ and F ₃ connected to the distribution line F ₁ is shown. Table 3 shows the load on each node.

When a ground fault occurs at node 12 (section 12) of distribution line F ₁ shown in Fig. 5, power is supplied from the power supply side of distribution line F ₁ to nodes 10 and 11 by the operation of the switch as described above. However, the range of the nodes 12 to 19 is in a power failure state. Power cannot be supplied to the node where the accident occurred, but the other nodes (nodes 13 to 19) are in the normal power outage section where there is a power outage because they are on the downstream side of the node where the accident occurred, and power is supplied from other distribution lines. It is possible to recover from a power failure by sending it.

This healthy blackout section includes the node 15 connected to the important load and registered in the first priority section. It should be noted that this priority section is set by the man-machine device 2 shown in FIG.
As shown in the table, one distribution line is designated with 1 to 3 sections and priorities. The interchange route that can exchange power with the node 15 is a route from the distribution line F ₂ to TSW ₂ and a route from the distribution line F ₃ to TSW ₃ or TSW 4.

Each of the above routes is extracted by the following procedure.

(1) Check whether the switch attribute of the power supply side (upstream side) branch of the priority node is TSW or SW, and if TSW is a flexible node, and if SW is a node connected to the SW,
Examine the switch attributes of the branch connected to that node. When a plurality of branches are connected, it is checked whether each branch is TSW or SW. In the case of SW, the same investigation is performed for the node connected to the SW. While repeating the above work, continue until the branch toward the power supply side hits the TSW or accident area.

(2) When (1) is completed, the same work as (1) is continued until the TSW is applied to the branches other than the power supply side branch of the priority node.

With the above work, power can be exchanged with the priority node.
The TSW (branch) and its route are searched.

Next, the total load on the section of the route from each TSW capable of power interchange to the priority node is calculated. The load amount of each section is measured by a sensor attached to the switch, read by the switch slave station, and transmitted online to the distribution line monitoring and control device via the signal transmission path 4, or For the section load, the value obtained by the following formula from the total maximum load amount of the equipment connected as a load to the section in advance and the total actual load immediately before the accident of the distribution line is used.

Here, In ... load of section number n (node n) Cn ... total maximum load of equipment connected to node n If ... maximum value of predicted load of the distribution line Cf ... connected to the distribution line It is the total maximum load of the equipment (total maximum load of the equipment connected to each node for all nodes in the distribution line), and If considers that the power interchange state lasts for several hours,
The estimated load up to several hours (usually 2 to 3 hours) is estimated by the following formula, and the maximum value in that period is used.

Here, If (tn) ... Predicted load of the distribution line at tn Ie (tn) ... Value of the planned load curve of the distribution line at tn Ie (t ₀ ) ... t of the planned load curve of the distribution line Value at ₀ o'clock (immediately before the accident) It (t ₀ ) ... It is the actual load of the relevant distribution line at t ₀ o'clock (immediately before the accident).

The section load of each section obtained by the above method is aggregated along the route from the TSW, which is the source of reserve power interchange, to the restoration priority section, and this total load amount is set as TIi, and the reserve distribution line on the interchange side is reserved. The electric energy is AIi. i indicates an interchange route.

Next, TIi and ATi are compared, and an interchange route with a relationship of TIi ≤ AIi (3) is extracted. In Figure 5, TS
W2 reserve power amount (means the reserve power amount that can be supplied via TSW2. The same applies to other TSWs) AT ₂ =
16, TSW3 AT ₃ = 10, TSW4 AT ₄ = 12. Therefore, using Table 3 as the interval load value, comparing TIi and AIi for each route, the route of TSW2, TI ₂ = 12 <16 = AT ₂ TSW3 route, TI ₃ = 10 = 10 = AT ₃ TSW4 route, TI ₄ = 22> 10 = AT ₄ , and the routes that satisfy equation (3) are the TSW2 route and TSW3 route. Is.

Next, for the extracted path, it is confirmed whether the voltage at the end to which the interchanged power is accommodated falls within a specified value. The voltage drop in each section is generally obtained by the following formula.

However _{υ n = Zn (in + 1} / 2In) ...... (4), the load of the passing current I _n ... interval n of the impedance i _n ... interval n of the voltage drop Z _n ... interval n of upsilon _{n ...} interval n Accordingly, the flexibility The voltage drop to the end is Indicated by. υ _n ′ is the total voltage drop amount from the TSW to the end of the concession section, and υ _k is the voltage drop value in the section K. K = 1 to K = n in the equation (5) means from TSW to the most end concession section, and is unrelated to the node number in FIG. The voltage Vi at the TSW on the power interchange side is known, and the terminal voltage Vn of the most end concealed section n is calculated by Vn = Vi−υ _n ′ (6). Is this Vn within the specified value? I can investigate.

As the specified value, ± 10% of the operating voltage standard is applied, and the route where the voltage deviates from this value is excluded. The route of TSW2 and the route of TSW3 satisfy this condition.

A route with a short interchange operation time is extracted from the interchange routes extracted by the above procedure. First, the operating time of one switch is set to 10 seconds, and the operating time and the forward operation time (X
Compare the (time limit) and select the shorter time. Also,
The terminal on the power supply side is in the opposite direction to TSW and the interchange current S
The operation time (10 seconds) is selected for W.

The flexible operation time of each extracted route is calculated based on the selected time.

TSW2 route… TSW2 operation time (10 sec) + SW15 X time limit (5 sec) = 15 seconds TSW3 route… TSW3 operation time (10 sec) + SW16 operation time (10 sec) = 20 sec The flexible operation times of the routes are compared, and the shorter route of TSW2 is adopted. When the interchange operation times are the same, the route having the larger amount of reserve power after the interchange of power is adopted.

When the power interchange path is determined, the switch is operated. TS
The operation procedure for exchanging power through the W2 route
Shown in the table. The disconnection operation of SW14 is to prevent the distribution line from becoming a loop state by closing the SW13 by the forward throwing function when the node 13 is charged for some reason.

In parallel with the switch operation for accommodating power to the restoration priority power failure section, the optimum load accommodation route is searched for the remaining healthy power failure section that is not supplied with power by this operation. The distribution line system targeted for this optimum load accommodation is the distribution line system shown by the broken line in FIG. 6a, which has been out of power even after the accommodation operation to the restoration priority section is completed. The evaluation of the optimum load accommodation route is determined by the following items.

(A) The amount of load in the section where the power outage is continued due to the inability to be interchanged is minimum, (B) The number of times the SW is turned off is minimum, and (C) The number of times of operation is minimum, the above conditions A flexible route that satisfies the following condition is searched for according to the following criteria. Of course, for a healthy power failure section, there is a TSW that can supply power to that section, and the reserve power of the flexible distribution line is larger than the load of the healthy power failure section.

(B) When an interchange route to a power outage section inevitably passes through a certain load section, or when a load section in which the SW is operating is connected with power supply to the power outage section, the load section is also the target system. Include in.

(B) A TSW route is assigned to a power failure section that can be accommodated by only one TSW.

(C) There is a large amount of standby power in the adjacent distribution line system, and if it is not used as interchange power, a power outage will occur, and there will be a series of blackout intervals that can be directly interchanged from the adjacent distribution system. If there is only one, the adjacent distribution line is allocated to the series of sections.

(D) Of the power outage sections, the section with a large power outage load is preferentially assigned.

(E) Prioritize power outage sections that require fewer switchgear operating procedures for power interchange.

Hereinafter, description will be given with reference to FIGS. 6a, 6b, and 6c. In FIG. 6a, nodes 17, 13, 18 and 19 are healthy blackout sections. Power can be exchanged to the node 17 only from the TSW1, the above-mentioned criterion (b) is applied, the route of the TSW1 is allocated, and the operation of closing the TSW1 and turning off the SW17 is performed. The switching operation of SW17 is based on the same reason as the switching operation of SW14 described above. Nodes 13, 18 and 19 can be accommodated by the following two routes.

I) TSW4 route, II) SW14 closed and routed from node TSW2 via node 14, I) route applies standard (C), TSW4, SW19,
Then, turn on SW18 and turn off SW13. In this case, the total node load is 10, which is less than the reserve power amount 12 of TSW4, and power interchange is possible. The interchange route in this case is 6b
It is indicated by a thick line in the figure. On the other hand, in the case of II), it will be accommodated from the route of TSW2 that was previously set for power transmission to the priority section,
The reserve power amount of TSW2 is 4 and can be accommodated only to the node 13. In this case, the standard (b) is applied to the remaining nodes 18 and 19 and the operation from the TSW 4 is performed. The flexible operation to the node 13 is SW18 OFF, SW13 OFF, and SW14 input, and the flexible operation to the nodes 18 and 19 is TSW4 input and SW19 input, for a total of five procedures. In the case of II,
It is shown in bold in Figure 6c.

It is assumed that the interchange paths shown in FIGS. 6b and 6c both satisfy the voltage drop criterion, and these two paths are
Comparatively evaluated. The evaluation items are shown in Table 5.

As is clear from Table 5, the route shown in Fig. 6b is adopted as the optimum accommodation route, and after the accommodation operation to the restoration priority blackout section shown in Table 4 is completed, the route shown in Fig. 6b continues. The flexible operation is performed.

As shown in FIG. 3, when a ground fault occurs in the section 14 of the distribution line F ₁ , the only route to transfer power to the priority section 15 is from TSW3, but the section 13 In the event of a ground fault, both the TSW2 and TSW3 routes can be accommodated, and if a ground fault occurs in section 10 or section 11, it can also be accommodated by the TSW1 and TSW4 routes. (It cannot be accommodated depending on the size of the load added to the accommodation route and the size of the reserve power of TSW1 and TSW4). Therefore, the size of the load applied to the interchange route and the amount of reserve power vary, so if we consider this separately, we should search for the interchange route in advance corresponding to the accident occurrence section. You can Table 6 shows the interchange routes searched for the priority section 15 of the distribution line F _{1 in} FIG.

When a ground fault occurs, the switch with the closing lock is detected to confirm the accident section number, and the accommodation route can be immediately obtained from this accident section number, so the accommodation route is searched after the accident occurs. Therefore, the flexible route can be selected in a short time.

Further, before actually accommodating the electric power through the accommodation route shown in Table 6, the load of the equipment connected to the accommodation route and the priority section is the reserve power to the accommodation route during the expected accommodation period. It is necessary to check whether the power supply means (TSW) that accommodates the power supply exceeds the reserve power that it has, but regardless of the occurrence of a power outage,
At a specified time interval, check the load and standby power to check the available interchange route, and if a power outage occurs before the next confirmation time, power will be supplied through the confirmed interchange route section. By providing the flexibility, it is possible to restore the power failure of the priority section in a shorter time.

〔The invention's effect〕

According to the present invention, a priority section for preferentially recovering a power outage is designated for each distribution line, and when a power failure accident that includes the priority section in a healthy power failure section occurs, first, in the priority section,
A route that allows electric power to be exchanged is searched for from an adjacent distribution line, and then an interchange route that does not exceed the reserve capacity that can be supplied by the searched interchange route and the load connected to the priority section is formed. For which the switch operating time is the shortest, to determine the interchange route,
It is possible to recover from a power outage in a priority section in a short time, which has the effect of reducing the social adverse effects of a power outage accident.

Further, in parallel with the switch operation to form an accommodation path for the priority section, for the remaining healthy power failure section that is not restored by a power failure by the accommodation path, on condition that the formation of the accommodation path to the priority section is completed, Since the flexible route is searched, the search condition of the flexible route is limited and the range of the search is narrowed, and the flexible route for the remaining healthy blackout section is selected in a short time, and the time required for power failure recovery of the remaining healthy blackout section is shortened. Has the effect of

Furthermore, a priority section is specified in advance for each distribution line, and for the specified priority section, a route for power supply is searched in advance in correspondence with the expected accident occurrence section, and when a power outage accident occurs, By the method of detecting the accident occurrence section and determining the accommodation route, the time for searching the accommodation route is shortened, and there is an effect of shortening the power failure recovery time.

Also, the size of the load connected to the searched interchange route and the priority section and the amount of reserve power of the power supply means connected to the interchange route can be constantly confirmed and used at a predetermined time interval. By always selecting a flexible route, it is possible to further reduce the time required to determine the flexible route for the priority section and to shorten the power failure recovery time.

[Brief description of drawings]

FIG. 1 is a block diagram showing an application example of the present invention, FIG. 2 is a system diagram showing an example of a distribution line system, and FIG. 3 is a system diagram showing a part of FIG. FIG. 4 is a waveform diagram showing the operation of each switch when a power failure occurs on the distribution line shown in FIG. 3, and FIG. 5 is a block diagram showing FIG. 3 as nodes and branches. 6a to 6c are block diagrams showing interchange routes. 1 ... Distribution line monitoring control device, 2 ... means for setting a priority section (man-machine device), 101 ... power supply means (coupling switch), 102 ... switch (switch with forward throw function) .

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shunji Unoz 3-2-1, Saiwaicho, Hitachi City, Ibaraki Prefecture Hitachi Engineering Co., Ltd. (72) Inventor Mitsuo Hayami 5, Omikacho, Hitachi City, Ibaraki Prefecture 2-1 Hitachi Ltd. Omika factory

Claims (4)

[Claims] 1. A state of a distribution line system comprising a distribution line consisting of a plurality of sections connected to each other via a switch and a plurality of power supply means connected to the distribution line to supply power. A distribution line load accommodating method for monitoring and controlling the switch to transmit power to a sound power failure section in the event of a distribution line power failure. Procedure for specifying the priority section for prioritizing restoration of power failure for each power distribution line in advance, and b. When a distribution line blackout accident occurs, a procedure for extracting the section existing in the sound power failure section group, and c. A procedure for searching for an interchange route connecting the priority section and the power supply means; d. From the searched interchange route, the load connected to the interchange route and the priority section, a procedure for extracting an interchange route that does not exceed the reserve power amount that can be supplied by the power supply means connected to the interchange route, E. A distribution line load accommodating method comprising: a procedure for selecting an accommodation path having a shortest switch operation time required to form the extracted accommodation path. 2. In parallel with the formation of an accommodation route for supplying electric power to a priority section, the remaining route is formed on the assumption that the accommodation route is formed for the remaining healthy blackout section where electric power is not supplied by the accommodation route. The procedure according to claim 1, further comprising a step of searching for and determining a section accommodation route, and performing a switch operation to form the remaining section accommodation route determined to be searched after completion of formation of the accommodation route. Electric wire load accommodation method. 3. A state of a distribution line system comprising a distribution line consisting of a plurality of sections connected to each other via a switch and a plurality of power supply means connected to the distribution line to supply power. A distribution line load accommodating method for monitoring and controlling the switch to transmit power to a sound power failure section in the event of a distribution line power failure. In advance, specify a priority section for each power distribution line that will be restored preferentially when a power failure occurs. For the designated priority section, search for an interchange route that will supply power in the event of a power outage in the distribution line, in advance corresponding to the section in which the accident occurred, and c. In the event of a power outage, the section for accommodating the load is determined by detecting the section where the accident occurred and determining the accommodation route. 4. The total value of the loads connected to the found concession route and the priority section and the size of the reserve power amount of the power supply means for conserving electric power to the concession route are constantly set at predetermined time intervals. 4. A comparison is made, wherein an accommodation route having a larger reserve power amount is extracted from the retrieved accommodation routes, and when the power failure occurs, the accommodation route is determined from the extracted accommodation routes. The method of accommodating the load of the distribution line described in.