JPH1028321A - Fault-section detector for power distribution system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly detect a fault section at job site, without installing any remote supervisory and controlling equipment, etc., to a master station. SOLUTION: Each switch controller 9 is provided with a means which monitors the opening/closing state of the section switch of its own section and outputs information regarding the opening/closing state, a means which collects fault information for detecting fault section, composed of the opening/closing state of each section switch 5, by successively transmitting information on the opening/closing state of each section switch 5 between each switch controller 9 by collecting the information from adjacent switch controllers 9 and successively transmitting the collected information to each switch controller 9 in the reverse order, a means which holds the fault information, and a means which returns the fault information upon receiving an information read command. A portable information-collecting device 17 is provided with a means which is operated to transmit the information read command and receive the fault information and a means which informs the opening/closing state of each section switch 5, based on the fault information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fault section detecting apparatus used for detecting a section (fault section) in which a fault such as a ground fault in a distribution system has occurred.

[0002]

2. Description of the Related Art Conventionally, in a distribution system, as shown in FIG. 7, a three-phase distribution line 4 is connected to a three-phase system power supply 2 of a substation 1 via a circuit breaker 3. Is divided into a plurality of sections # 0 and # by a plurality of section switches 5 such as pole switches.
1,...

Further, a switch control device 6 for controlling the opening and closing of each switching device 5 is connected to each switching device 5 so that each switching device VS
, VS2,... Are formed, and each switch control device 6 is connected to the upstream side (substation side) and the load side of each segment switch 5 via the transformers 7 and 8, and is usually connected to a transformer. It operates with the power supply from the distribution line 4 via either one of 7 and 8.

Each of the switching devices VS1, VS2,... Has its own section in the section # 1, # 2,... On the load side of the sectional switch 5, and if a failure such as a ground fault occurs in the own section, Based on the time-sequential turn-on described below, the switchgear control device 6 locks the segmented switch 5 in the faulty section in an open state, disconnects the faulty section from the system power supply 2, and restores each upstream healthy section.

That is, each switch control device 6 determines the system voltage on the upstream side and the load side of the segmented switch 5 from the information on the system voltage of the transformers 7 and 8 and the information on the system current in the own section (not shown). The status of the system is constantly monitored.
Is maintained in the closed state, and the system power supply 2 is connected to each section # 0, # 1,
...

Then, for example, as shown in FIG.
When the section # 3 becomes a faulty section, the breaker 3 is immediately tripped and opened by the detection of overcurrent of the distribution line 1 due to the ground fault, and the opening causes the system voltage of the distribution line 1 to be reduced. Disappears, each section switch 5 opens, and distribution line 4
Power outage.

Immediately after the first power failure, the circuit breaker 3 of the substation 1 is reclosed due to test charging, and power is restored in the section # 0. If not, the switch control device 6 of the section # 1 turns on the section switch 5 of the own section to restore power in the section # 1.

If the system voltage in the section # 1 does not disappear even after a certain period of time from the power recovery, the switch control device 6 in the section # 2 turns on the section switch 5 in the own section and turns on the section #.
2 is restored.

In this way, each of the section switches 5 is timed in sequence from the upstream side, and the section # 2 immediately before the failure section # 3 is restored, and the section switch 5 of the failure section # 3 is turned on. , The circuit breaker 3 trips again and opens, and the distribution line 4 again fails.

At this time, the system voltage in the failure section # 3 instantaneously disappears within a certain time period after the section switch 5 in the section # 3 is turned on, and based on the instantaneous disappearance, the switch control in the failure section # 3 is performed. The section switch 5 of the section # 3 is locked in the open state by the device 6, and the failure section # 3 is disconnected from the system.

Thereafter, the circuit breaker 3 of the substation 1 is closed again by the second trial charging, and the section switches 5 of the sections # 1 and # 2 are sequentially turned on by the same timed closing as described above, and the healthy section # 0 ~ # 2 is restored.

At this time, even if the power is restored in the section # 2, the section switch 5 in the failure section # 3 is locked in the open state and is not turned on, and the failure section # 3 is disconnected as shown in FIG. The healthy sections # 0 to # 2 on the upstream side are restored.

Then, the fault section # 3 is recovered by removing the cause of the fault by a recovery operation and then manually turning on the section switch 5 of the section # 3 to recover. Therefore, it is necessary to quickly detect and specify the failure section # 3, and to immediately perform the recovery work.

In a power distribution system equipped with a so-called power distribution automation system, an accident section # 3 is detected and specified at a power company business office or the like. An apparatus is provided.

Each switch control device 6 is provided with a communication function as a slave station device for communicating with the master station device and a function of monitoring the open / closed state of the segmented switch 5 in the own section and outputting the information. You.

Then, the master station device and each switch control device 6 are connected by a communication cable, and information such as the open / closed state of each segmented switch 5 is transmitted from each switch control device 6 to the master station device by polling communication. The master switch detects the section switch 5 locked in the open state from the information on the open / close state of each section switch 5 and the like, and detects the fault section # 3.

[0017]

In a distribution system in which the above-mentioned conventional distribution automation system is not provided, an operator goes to the site and controls each switch control device 2 one by one based on experience and intuition. It is necessary to inspect and identify the sectional switch 5 locked in the open state, and detect the fault section # 3.
For this reason, there is a problem that it takes time to detect a failure section, and the recovery operation cannot be performed quickly.

In order to improve the power distribution automation system and provide a master station device for remote monitoring and control, a huge capital investment is required. Therefore, the fault section can be quickly detected at low cost without providing a master station device or the like. It is desired to be able to do.

Further, even in a distribution system equipped with a distribution automation system, if a faulty section can be quickly detected on site, restoration work can be performed more promptly.

It is an object of the present invention to enable quick detection of a faulty section on site at low cost without providing a master station device for remote monitoring control.

[0021]

In order to solve the above-mentioned problems, a faulty section detection device for a distribution system according to the present invention is provided with a switch control device for each section switch, which is provided with a switching state of a section switch in its own section. Means for monitoring and outputting switching status information, and communicating with a switch control device of an adjacent segment switch, and sequentially transmitting information on the switching status of the segment switches between the switch controllers by communication of information collection. And collects the fault information for detecting the fault section consisting of the information on the open / closed state of each switch. After the information collection communication is completed, the fault information is transmitted to each switch controller by information distribution communication. A means for sequentially transmitting the information, a means for holding the received failure information, and a means for returning the failure information held by receiving the information reading instruction. Send and receive failure information And means, and means for notifying the opening and closing states of the respective section switches based on the received failure information.

Therefore, the communication of information collection between the switch control devices of each of the segment switches collects information on the open / closed state of each of the segment switches to form fault information. Are sequentially delivered to and held by the switch control devices of the respective segment switches.

When a failure occurs in the power distribution system, the worker goes to the site with the information collecting device, and sends an information reading command from the device to a nearby switch control device. The failure information is sent to the information collection device, and based on the failure information, the information switching device is notified of the current open / closed state of all the switchgears. Sections are detected quickly.

In this case, communication is performed between the respective switch control devices, and a master station device for remote monitoring and control of the power distribution automation system is unnecessary and inexpensive. Recovery work can be performed in

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. In FIG. 2 showing the distribution system, the same reference numerals as those in FIG.
Are different from the switchgears VS1 of the sections # 1, # 2,.
VS2,... Is provided with a switch control device 9 in which a local communication function for information collection and information distribution is added to the conventional switch control device 6.

This switch control device 9 has its own section # 1, #
2, and monitors the open / closed state of the segmented switches 5, and performs wireless communication for information collection and information distribution with the adjacent switch control device 9 and wireless communication for information transfer with the information collection device described later. In order to perform this, a control processing unit 10 having a microcomputer configuration and a wireless transceiver 11 are provided as shown in FIG.

In order to secure a power supply during a power failure due to a failure of the distribution line 4 or the like, the switch control device 9 is provided with a backup power supply of a battery power supply which is normally charged by the system power supply 2 via the transformers 7 and 8. The power supply 12 operates during a power failure.

Further, in this embodiment, the switch control device 9 is connected to a communication cable of a master station device for remote monitoring and control so that the switch device can be used as a slave station device or the like of a power distribution automation system. Wired communication terminal 1
3 is provided.

When each of the switchgears VS1, VS2,... Is a pole-mounted device, the sectional switchgear 5, the switchgear controller 9 and the like are mounted on the utility pole 14 as shown in FIG. Note that 15 in FIG. 3 is a lightning arrester for each phase.

Next, the control processing section 10 will be described. The control processing unit 10 executes a control processing program provided in advance, and forms the following units (i), (ii), and (iii). (I) Opening / closing state monitoring means A means for constantly monitoring the opening / closing state from an auxiliary contact signal or the like of the segmented switch 5 and outputting information on the opening / closing state. In a rewritable storage unit 16 such as a memory, for example, it is held as one of the state monitoring information together with the monitoring information of the system voltage detected from the secondary voltages of the transformers 7 and 8.

(Ii) Local communication means The radio communication device 11 is controlled and communicates with the switch control device 9 of the adjacent segment switch 5 to collect the following information (a) and (b).
This is a function to distribute information. (A) Information collection communication Continuous (periodic) communication or communication at the time of occurrence of a fault such as a ground fault accident of the distribution line 4, for example, the received information from the upstream switch control device 9 on the upstream side is transmitted to the own section. The information including the information on the open / close state of the segmented switch 5 is added and transmitted to the adjacent switch controller 9 on the load side, and as shown by the broken line a in FIG. Each section # 1, # 2 from the switch control device 9 to the switch control device 9 of the segment switch 5 which is the most downstream.
.. Are sequentially transmitted, and information on the open / closed states of all the segment switches 5 is collected as failure information for detecting a failure section.

(B) Communication of information distribution Each time the collection of the state information of each section by the communication of information collection is completed, for example, as shown by a broken line A in FIG. The status information of each section collected by the control device 9 is sequentially transmitted to the switch control device 9 of the most upstream section switch 5, and the collected failure information of each section is controlled by the switch of each section switch 5. This is communication that is sequentially delivered to the device 9. Then, the failure information received by the information distribution is rewritably held in the storage unit 16 forming the information holding means.

(Iii) Information reading / communication means For example, the portable information collecting apparatus 1 of FIG. 1 carried by a worker
7 via the wireless transceiver 11 and the information collection device 1
This is a means for returning the failure information held in the storage unit 16 in response to the reception of the information reading command from the storage unit 7.

Next, the information collecting device 17 will be described. This device 17 includes a control unit such as a microcomputer and a transceiver, is formed as a so-called handy terminal, and includes the following means (iv) and (v). (Iv) Information reading means This is a means for transmitting an information reading command by operating the operation unit 18 such as a numeric keypad and receiving failure information. (V) Information display means This is means for displaying and notifying the open / close state of each of the sectional switches 5 on the liquid crystal panel 19 based on the received failure information.

Next, communication of information collection and information distribution will be described. The information collection and the information distribution of the local communication of each switch control device 9 are performed, for example, by transmitting a signal of a format shown in FIG. This signal is composed of an area a of the first transmission type and an end code (end code) at the end.
Information area c ₁ ,
c _2, is formed by providing a ..., area a transmission type, as shown in the same figure (b), from the beginning of the forward synchronization area a _1,
Identification area a ₂ of the information collection / distribution, area a ₄ areas a ₃ invoked address of the polling start address consists of the area a ₅ polling end address.

[0036] Then, when the information collection, as shown in the same figure (c), stored information of the synchronization signal to the synchronization area a _1, identification information indicating identification area a ₂ to collect information following are stored You.

Further, switchgear VS1 showing a switch control device 9 is for example section # 1 transmission initiating device to the area a ₃
The address is stored, switchgear V showing the switch control device 9 is for example section # 5 transmission termination device area a ₅
The address of S5 is stored.

[0038] Further, since the area a ₄ address switch controller 9 to call the next to be rewritten for each transmission is stored, in the case of FIG. 5 (c) is immediately after the start transmission, 2
Switchgear VS showing switchgear controller 9 of the second category # 2
2 are stored.

[0039] Then, the format signal in (a) of sequentially 5 from section # 1 of the switch control unit 9 in accordance with the address of the area a ₄ to switch the control unit 9 of the section # 5 is transmitted by the wireless communication At this time, each switch control device 9 stores in the information areas c ₁ , c ₂ ,...
2, together with the writing ..., and transmits the rewrite address of the area a ₄ to switch the control unit 9 next to the load side.

FIG. 5C shows a signal transmitted from the switch control device 9 in the first section # 1 to the switch control device 9 in the next section # 2. there therefore, condition monitoring information DVS only on the first information area c ₁
1 is stored.

After the information is collected, the last switch control device 9 of the section # 5 is provided with status monitoring information DVS1 and DVS of all the segment switches 5 as shown in FIG.
Failure information including information on the open / closed states of 2,... Is collected.

Next, in the case of communication for information distribution, as shown in (d) of the figure, the communication signal of the communication signal is such that the addresses of the areas a ₃ and a ₅ indicate the end and start addresses of the apparatus, and the area a ₄ Next, the address of the device to be called next is updated and written for each transmission.

[0043] Then, the signal (d) of FIG accordance with the address of the area a ₄ is transmitted sequentially wirelessly communicate with each switch controller 9, the failure information is delivered to the switch controller 9.

By this distribution, the switch controller 9 of each section
The storage unit 16 stores the latest lock / unlock indicating whether or not the sectional switches 5 of the switchgears VS1 to VS5 in each section are locked in the open state, for example, as shown in FIG. Information is held as information on the open / close state of each of the sectional switches 5.

For example, when a failure such as a ground fault occurs in the section # 3, the section switch 5 of the section # 3 is locked in an open state, and only the information of the section # 3 in the storage section 16 is locked. .

Therefore, the switch control device 9 of each section # 1, # 2,... Transmits information on the open / close state of the segmented switch 5 of each section by wireless communication information transmission between the switch control devices 9. Is stored.

Next, when a ground fault or the like occurs, as shown in FIG. 3, the worker 20 goes out to the site with the information collecting device 17 and sends the information to the switch control device 9 nearby. When the read command is transmitted, upon receipt of the information read command, the nearby switch control device 9 reads the fault information in the storage unit 16 and returns the fault information to the information collecting device 17, as shown in FIG. The open / closed state of each of the sectional switches 5 is displayed on the liquid crystal display panel 19 of the device 17 in a system diagram or the like, and is notified.

The display on the liquid crystal display panel 19 allows the worker 20 to grasp the section switch 5 locked in the open state and detect the load-side accident section # 3. In this case, the accident section can be quickly detected and specified at the site, and the recovery work and the like can be performed quickly.

Therefore, even in an area where an automatic power distribution system is not provided, by using the switch control device 9, a faulty section can be quickly detected with an inexpensive configuration in which a master station device for remote monitoring control is not provided. Then, a recovery operation or the like can be performed.

Furthermore, since the fault information is taken out from the nearby switch control device 9 by the worker 20 who has gone to the site and the fault section is immediately detected, even in an area where the automatic power distribution system is provided, Recovery work can be started more quickly.

In a region where the automatic power distribution system is provided, a communication cable with the master station device is connected to the wired communication terminal 13 of each switch control device 9 and the control unit 1 is connected.
Control means for polling communication with the master station device and the like are added to 0.

The communication between the switch control devices 9 and the communication between the switch control devices 9 and the information collecting device 17 may be wired communication. Also, each section # 1, # 2,
The method of detecting a fault such as a ground fault may be any method, and the communication direction of information collection and information distribution may be opposite to the above. Further, the notification means of the information collecting device 17 may be a lamp or the like.

[0053]

The present invention has the following effects. By communication between the switch control devices 9 of the respective segment switches 5, information on the open / close state of each of the segment switches 5 is collected to form failure information. 9 is held.

Therefore, when a failure occurs in the power distribution system, the worker 20 goes out to the site with the information collecting device 17 or the like and sends an information reading command from the device 17 to the switch control device 9 nearby. The fault information is sent from the device control device 9 to the information collecting device 17, and based on the fault information, the current open / close state of all the switchgears 5 is notified to the information collecting device 17, and from this notification, the open / closed state is locked. The identified section switch 3 can be immediately specified, and a faulty section can be quickly detected.

Therefore, it is possible to quickly detect a faulty section at the site and quickly carry out recovery work without using a master station apparatus for remote monitoring control such as a master station apparatus of the power distribution automation system. .

[Brief description of the drawings]

FIG. 1 is a block connection diagram of a switchgear according to an embodiment of the present invention.

FIG. 2 is a system diagram of a power distribution system provided with the switchgear of FIG. 1;

FIG. 3 is an explanatory view of a mounting state of the opening / closing device of FIG. 1;

FIG. 4 is an explanatory diagram of communication of information collection and information distribution in FIG. 1;

5 (a) to 5 (e) are explanatory diagrams of a format of a communication signal for information collection and information distribution of FIG. 1 and information to be transmitted.

FIG. 6 is an explanatory diagram of communication between the switch control device and the information collecting device in FIG. 1;

FIG. 7 is an explanatory diagram of a conventional power distribution system.

FIG. 8 is an explanatory diagram of separation of an accident section of a time-sequential system when a ground fault occurs in FIG. 7;

[Explanation of symbols]

 4 Distribution Line 5 Sectional Switch 9 Switch Control Device 10 Control Processing Unit 17 Information Collection Device

Claims (1)

[Claims] 1. A switch control device for each section switch of a distribution line monitors a system state such as a system voltage of the distribution line,
In the event of a failure such as a ground fault accident of the distribution line, in a distribution system in which the section on the load side becomes a faulty section, the section switch is locked in an open state and the faulty section is separated, the switch control device includes: Means for monitoring the open / closed state of the segmented switches in the own section and outputting the information on the open / closed state; and communicating with the switchgear control device of the adjacent segmented switchgear; Open / closed state information is sequentially transmitted between the switch control devices to collect fault information for detecting a fault section including the open / closed state information of each segmented switch, and the information is distributed after the information collection communication is completed. Means for sequentially transmitting the fault information to each of the switch control devices in reverse of the information collection communication by the communication of the above, means for holding the received fault information, and the fault held by receiving the information read command. Reply information Means for transmitting the information read command by operation to receive the failure information to a portable information collection device, and for notifying the open / closed state of each of the sectional switches based on the received failure information. And a means for detecting a faulty section of the distribution system.