JP2000050532A - Power system monitor control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively reflect changes at newly installing an apparatus, maintenance or change of a power system state or the like to positional relation information along a power supply route, by autonomously recognizing the relation on the power supply route in cooperation between respective units. SOLUTION: A compact relay unit A (or B) decides the presence or absence of a fault in a monitoring section surrounded by the unit A and the unit B by using electric data of own terminal and electric data of the unit B (or A). When the presence of the fault is decided, an open command is given to a circuit breaker (a) (or (b)). Further, the unit B communicates with a compact relay unit C and a compact relay unit E to input electric data, decides the presence or absence of a fault in a monitoring section surrounded by the unit B, the unit C and the unit E. When the presence of the fault is decided, an open command is given to the breaker (b).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system including a plurality of devices, such as a protection relay system for monitoring and shutting down an accident in a power system, and a power distribution system for controlling opening and closing of a pole switch in a distribution system. The present invention relates to a system that uses positional relationship information along a power supply path between devices.

[0002]

2. Description of the Related Art The current status of power system protection relay systems is described in IEEJ Technical Report No. 641 (July 1997).
It is described in "Protection Relay System Basic Technology System".

[0003] The protection relay system of the power system monitors an accident occurring in the power system, and when an accident is detected, performs a process of separating the accident section (interruption of the accident). The individual devices that make up the protection relay system are generally called relays. Roughly, the process involves taking in electrical data (voltage values, current values, etc.) of the power system via sensors, determining the presence or absence of an accident using those data, and shutting down the system appropriately when it is determined that there is an accident. Give an open command to the vessel to shut off the accident.

There are several operating principles of the relay. For example, in a method called a current differential method, the presence or absence of an accident in a section (monitoring section) surrounded by several sensors is determined by using the current value of each sensor. In this method, the direction of exit from the monitoring section is defined as positive, the current values of the sensors are totaled, and when the total value is other than 0, it is determined that there is an accident in the monitoring section. At this time, the monitoring section can be widened or narrowed depending on the combination of the sensors to be used. The minimum monitoring section is a section surrounded by sensors adjacent to each other and does not include another sensor inside. Which range is set as a monitoring section by each relay is set when the relay is installed.

[0005] In any operating principle, the correspondence between the relay and the sensor as to which sensor the relay uses, and the correspondence between the relay and the circuit breaker as to which circuit breaker the relay issues a command to (a protection relay system). Configuration) is required. However, when the connection state of the system changes due to system switching or the like, it is necessary to change the association between the relay and the sensor or the association between the relay and the circuit breaker (reconfiguration of the protection relay system). At present, when the relay is installed, a change in the connection state of the electric power system is assumed to some extent, and the relay is set in advance so as to be able to cope with any case in the range. In addition, when it is found that an unexpected change occurs, an appropriate association is reexamined and set again each time.

[0006] In the distribution system, devices called slave stations are installed, and these slave stations control opening / closing of pole switches according to instructions from the master station. In the event of a power distribution system accident, the root of the power supply path is cut off once, and switches are turned on sequentially from the end of the distribution line to identify the accident section when the accident recurs (tentatively called a power distribution system). At this time, it is necessary for the master station to know the positional relationship information along the power supply path of each slave station, and at present, work is performed to update the master station database when the slave station is installed or when the system connection status changes. I have.

[0007]

SUMMARY OF THE INVENTION In a protection relay system, at present, it is necessary to suppose a power system connection state before an accident occurs in the power system, and to carefully examine and set a configuration that matches this. is there. Conversely, if the assumptions are not perfect, a mismatch will occur, resulting in improper handling at the time of the accident and a major power outage. On the other hand, in order to prevent a mismatch due to lack of assumption, it is necessary to reliably reconfigure the protection relay system immediately after the change in the power system connection state. The configuration of the protection relay system is determined depending on the positional relationship of each relay, sensor, and circuit breaker on the power supply path. For example, when emphasis is placed on the fault section discrimination ability in a relay using the current differential method, the sensor and the relay are associated with each other so that the monitoring section becomes as small as possible. here,
The minimum monitoring section is a portion surrounded by sensors closest to each other and does not include another sensor inside. You will associate such a set of sensors with a relay, but the problem is how to find the most recent sensor. There is a need for a method that can reliably reflect such changes in the configuration of the protection relay system when a protection relay device is newly installed, when maintenance is performed, or when the system connection status changes. The same can be said not only for the minimum monitoring section, but also for a slightly wider monitoring section.

In a power distribution system for controlling opening / closing of a pole switch of a power distribution system, a slave station managed in a master station database when a slave station is newly established, when maintenance is performed, or when a grid connection state changes. There is a need for a method that can reliably reflect those changes in positional relationship information along the power supply path.

It is an object of the present invention to provide a system including a plurality of devices and using positional relationship information along a power supply path between the devices. When the change of
An object of the present invention is to provide a power system monitoring and control device that can surely reflect such changes in positional relationship information along a power supply path between devices. The present invention solves this problem by providing a technology for autonomously recognizing a positional relationship in cooperation between devices. As a result, even when the target range of the system is expanded, the formation between devices can be autonomously reconfigured simply by installing a standard device without changing specifications such as CPU performance and oversight capacity of the device. Since the system can be expanded in such a manner, the expandability of the system can be greatly improved.

[0010]

The power system monitoring and control system according to the present invention is a system composed of a plurality of devices, such as a protection relay system and a power distribution system, which stores positional relationship information along a power supply path between the devices. In such a system as used, each device is provided with the following means, and is provided with a communication means for connecting the devices.

Each device includes a carrier output means for outputting a power line carrier, a carrier observing means for observing a power line carrier, a communication control means for performing inter-device communication, and a device for outputting a power line carrier or observing a power line carrier for inter-device communication. And a topology recognizing means for recognizing a positional relationship along the power supply path.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a block diagram of a compact relay system 2 to which the present invention is applied. A power system 1, a communication network 4, and a compact relay device 3 are described. Each compact relay device 3 is, as a block for realizing the function of the protection relay, a sensor unit 301 for observing an electric state quantity such as a current or a voltage of the power system 1 (the sensor unit 301 is provided outside the compact relay device 3. May be integrated with the compact relay device 3 here),
A communication control unit 302 for performing inter-device communication; an accident determination unit 30 for determining the presence or absence of an accident on the power system 1 using various data
3. An accident interrupting section 304 for sending an interrupt command to an appropriate circuit breaker when the accident determining section 303 determines that an accident has occurred. As a block that realizes a function of cooperative and autonomous recognition, a carrier output unit 305 that outputs a power line carrier to a power line, a carrier observation unit 306 that observes a power line carrier, output of a power line carrier, observation of a power line carrier, and other compact relays A topology recognizing unit 30 that controls the data fetch from the device 3 to recognize the positional relationship along the power supply path between the devices and changes the definition information of the monitoring section (information about what is the compact relay device at the boundary).
7. A control section 30 including a monitoring section definition information data section 308 for managing the definition information of the monitoring section, and controlling the entire section.
9 is provided.

A protection relay system (compact relay system 2) to which the present invention is applied will be described with reference to FIG. Hereinafter, a current differential method will be described as an example of the operation principle of the relay to facilitate understanding.
The same applies to other relay operating principles, for example, the direction comparison relay system.

FIG. 2 schematically shows an example of a system configuration, in which a transmission line 5, a busbar 6, a circuit breaker 7, and a compact relay device 3 are configured. The accident determination unit of the compact relay device 3 captures the electrical state quantity such as the current or voltage of the system via the sensor unit, and the compact relay device at another boundary (compact relay at the boundary) for the monitoring section where the boundary is located. Which device is managed in the monitoring section definition information data section), communicates via the communication control section and the communication network 4, and receives the electrical signals captured by the compact relay apparatus via the sensor section. It takes in the state quantity data and the data generated by the calculation by the compact relay device. Further, it is assumed that all the compact relay devices always synchronize the observation timing using a GPS signal or the like. The accident judging section of the compact relay device judges whether there is an accident in the monitoring section where it is a boundary by using the acquired data. When the accident discriminating unit judges that an accident has occurred, the accident interrupting unit of the compact relay device sends an open command to the appropriate circuit breaker 7 to interrupt the accident.

The cooperation between the compact relay devices in the accident detection processing and the accident cutoff processing will be described in more detail with reference to FIG. This is a description of the cooperation between the compact relay devices, and for simplicity of description, the processing performed by each block in the compact relay device will be described as being performed by the compact relay device.

For example, the compact relay device A measures its own electrical data, communicates with the compact relay device B, captures the electrical data, and measures the electrical data measured by the compact relay device A and the compact relay device B. The presence / absence of an accident in the portion surrounded by the compact relay device A and the compact relay device B is determined using the statistical data, and when it is determined that an accident has occurred, an open command is given to the circuit breaker a. Similarly, the compact relay device B determines the presence or absence of an accident in a portion surrounded by the compact relay device A and the compact relay device B using the electrical data of the end device and the electrical data of the compact relay device A, and determines that there is an accident. When it is determined, an open command is given to the circuit breaker b. Furthermore, the compact relay device B is a compact relay device A
Communication with the nearest compact relay device C and compact relay device E on the opposite side, and fetching their electrical data, the presence or absence of an accident in the area surrounded by compact relay device B, compact relay device C and compact relay device E Is determined, and when it is determined that there is an accident, an open command is given to the circuit breaker b. A portion surrounded by the compact relay device A and the compact relay device B and a portion surrounded by the compact relay device B, the compact relay device C, and the compact relay device E are monitoring sections.
In each monitoring section, the compact relay devices at the boundary communicate with each other.

The above-described process of detecting and shutting down an accident is a general mechanism of the current-current differential type protection relay system except that the sensor and the relay are integrated.

The main feature of the present invention is that when a compact relay device is newly installed, when maintenance is performed, or when the system connection state changes,
The monitoring section is autonomously reconfigured by cooperation between the compact relay devices. For example, FIG. 3 shows a case where a compact relay device X is newly introduced in FIG. At this time, the newly introduced compact relay device X autonomously searches for the latest compact relay devices and cooperates with them to subdivide the monitoring section. That is, the compact relay device B and the compact relay device C
The monitoring section surrounded by the compact relay device E is subdivided by the newly introduced compact relay device X. By this subdivision, the accident section can be specified more finely, and the accident blocking range can be limited. By autonomously reconfiguring the monitoring section, only by installing the compact relay device, it is possible to localize the cutoff range at the time of an accident, optimally for the state of the protection relay system and the connection state of the system.

Next, with respect to the process of autonomously reconfiguring the monitoring section, which is the essence of the present invention, as a typical case where a compact relay device is newly introduced,
This will be described in detail with reference to FIG. The processing using FIG. 4 described below as an example is naturally extended to general cases other than the example in FIG. Also, the monitoring section reconfiguration processing at the time of lock or removal due to maintenance of the compact relay device or the like, and the monitoring section reconfiguration processing at the time of a change in the system connection state are realized in the same manner except that the trigger is different.

FIG. 4 schematically shows a power line including three terminals, existing compact relay devices A, B, C, D, and E and a new compact relay device X. Monitoring sections # 1 to # 6 and monitoring sections # 1 to # 6, # 31, and # 32 after X is newly established are shown. Also, B is the compact relay device that is electrically closest to X.

The overall flow of the monitoring section reconfiguration processing will be described below. The flowchart of FIG. 5 is schematically shown.

(1) The newly provided X control unit instructs the topology recognition unit to recognize the topology.

(2) The topology recognizing unit of X searches for a compact relay device closest to X. As a result of the search, a compact relay device B is obtained. Details of the search processing will be described later.

(3) The topology recognizing unit for X determines which of the two monitoring sections adjacent to B contains X. There are at most two monitoring sections adjacent to B (the monitoring section at most is adjacent to any compact relay device).
One). In the example of FIG. 4, the adjacent monitoring sections are # 2 and # 3, and it is concluded that the determination result X is included in # 3. Details of the determination processing will be described later.

(4) The X topology recognizing unit updates the monitoring section definition information in the monitoring section definition information data section of X so that the monitoring section including X is divided into two monitoring sections by X, and is updated at the same time. The compact relay device at the boundary of the monitored section transmits the updated original monitoring section definition information and the definition information of the new monitoring section at which the compact relay apparatus is a boundary, and instructs the compact relay apparatus to update the monitoring section definition information. . Upon receiving the instruction to update the monitoring section definition information, the control unit of the compact relay device instructs the monitoring section definition information data section to replace the received monitoring section definition information before update with new monitoring section definition information. Details of the monitoring section definition information updating process in X will be described later. In the example of FIG. 4, # 3 is divided into two monitoring sections by X, and as a result, # 3 is divided into # 31 and # 32.

The process of searching for a compact relay device in which X is closest to X will be described below. The flowchart of FIG. 6 is schematically shown. Upon activation from the control unit of X, the topology recognition unit controls the whole. In the example of FIG. 4, a compact relay device B is obtained as a result.

(1) When each compact relay device detects a carrier wave emitted by X, the topology recognition unit of X instructs the carrier wave output unit to output a carrier wave instructing the result to be returned to X.

The carrier output unit for X outputs a carrier (6
01).

(2) When the carrier observation unit of each compact relay device i detects the power line carrier, the control unit according to the observation result of the carrier, sets the first sampling time ti at which the carrier was received and the data of the phase θi at that time ( ti,
θi) is transmitted to X via the communication control unit (602).

(3) The topology recognizing unit of X takes in the phase data with the time stamp via the communication control unit for a fixed time. Let I be the set of compact relay devices received. This means that the data of (ti, θi) (i∈I) has been received (603).

(4) The topology recognizing unit for X finds the minimum value tmin of ti in the received (ti, θi) (i∈I) (604).

(5) The topology recognizing unit of X is (tj, θ
j) (tj∈I, tj = tmin), a compact relay device having the smallest θj is obtained (605). In the example of FIG. 4, a compact relay device B is obtained.

A process for determining which of the monitoring sections adjacent to B is included in X will be described below. The outline of FIG. 7 is shown in the flowchart. The X topology recognition unit controls the whole. In the example of FIG. 4, it is determined that the value is included in # 3.

(1) The topology recognition unit for X instructs B via the communication control unit to return one of the compact relay devices adjacent to B (701).

(2) The control unit B obtains one of the compact relay devices adjacent to itself from the monitoring section definition information data unit.
Extract one. This is referred to as a compact relay device N.
In the example of FIG. 4, there are three units A, C, and E, but A is assumed to be extracted. The following processing is exactly the same when C and E are extracted.

(3) The control unit of B receives N via the communication control unit.
To X (702).

(4) The X topology recognizing unit notifies B and N that the monitoring section discriminating process is to be performed (703).

(5) Each of the control units B and N shifts to the monitoring section discrimination processing mode.

(6) The topology recognition unit for X instructs N via the communication control unit to determine which of B and X is closer to N.

(7) The control unit of N instructs the topology recognizing unit to determine which of B and X is closer to N (704).

(8) When each compact relay device detects a carrier wave emitted by N, the topology recognition unit of N instructs the carrier wave output unit to output a carrier wave instructing the result to be returned to N.

(9) When the carrier observation unit of each compact relay device detects the power line carrier, the control unit according to the observation result of the carrier, sets the first sampling time ti at which the carrier was received and the data (t) of the phase θi at that time. , Θ)
Is transmitted to X via the communication control unit (706).

(10) The topology recognition unit of N receives the phase data with time stamp B (tB,
θB) and phase data with time stamp of X (tX, θ
X) is received (707).

(11) The topology recognition unit of N is tB <t
If X, B is determined to be close.

(12) The topology recognition unit of N is tB> t
If X, it is determined that X is close.

(13) The topology recognition unit of N is tB = t
If X, θB <θX, it is determined that B is close.

(14) The topology recognition unit of N is tB = t
If X, θB> θX, it is determined that X is close.

(15) The topology recognition unit of N returns the compact relay device determined to be close to B and X to X (70).
8). In the example of FIG. 4, B is returned.

(16) Upon receiving X as a reply from N, the topology recognizing section of X determines that X is included in the monitoring section on the N side, and receives B and determines that X is included in the monitoring section on the opposite side. Determine. In the example of FIG. 4, it is determined that the value is included in # 3 (709).

The monitoring section definition information updating process in X will be described below with reference to the example of FIG. The flowchart of FIG. 8 is schematically shown. The X topology recognition unit controls the whole. In the example of FIG. 4, the process is to divide $ 3 into $ 31 and $ 32. In the example of FIG. 4, a branch is included in the divided # 3, and the processing in this configuration pattern is naturally extended to other configuration patterns.

(1) The topology recognizing unit of X instructs B via the communication control unit to return all compact relay devices at the boundary of # 3 (801).

(2) The control unit B extracts a compact relay device at the boundary of # 3 from the monitoring section definition information data unit. C and E are extracted (802).

(3) The control unit of B returns C and E to X via the communication control unit.

(4) The topology recognizing unit of X notifies B, C, and E that monitoring section division processing is to be performed via the communication control unit (803).

(5) The control units B, C, and E shift to the monitoring section division processing mode, respectively.

(6) The X topology recognizing unit instructs B via the communication control unit to output a carrier (80).
4).

(7) The control unit B instructs the carrier output unit to output a carrier wave (805).

(8) The X topology recognizing unit instructs the carrier output unit to output a carrier having an opposite phase to the carrier from B observed by the carrier observing unit so as to cancel the carrier (806).

(9) The X topology recognizing unit sends the amplitude value of the carrier to be observed to C and E via the communication control unit to X
(807).

(10) The control units C and E observe the carrier wave for a predetermined period of time (one or more wavelengths), and if the maximum value of the amplitude value is equal to or more than the predetermined threshold value, one must be set. For example, 0 is returned to X via the communication control unit. Respectively,
yC and yE are set (808).

(11) The topology recognition unit for X receives yC and yE from C and E via the communication control unit. (YC,
yE) are (0,0), (0,1),
(1, 0).

(12) The topology recognizing unit of X uses yC =
If 0, yE = 0, it is determined that X is on the B side from the branch point, and the monitoring section # 3 is divided into two monitoring sections surrounded by B and X and monitoring sections surrounded by X, C and E. To the monitoring section definition information data section (809).

(13) The topology recognizing section of X has yC =
If 0, yE = 1, it is determined that X is on the C side from the branch point, and the monitoring section # 3 is defined as a monitoring section surrounded by B, X, and E;
The monitoring section definition information data section is instructed to divide the monitoring section into two monitoring sections surrounded by X and C (810).

(14) The topology recognizing section of X has yC =
If 1, yE = 0, it is determined that X is on the E side from the branch point, and a monitoring section # 3 is defined as a monitoring section surrounded by B, X, and C;
The monitoring section definition information data section is instructed to divide into two monitoring sections surrounded by X and E (811).

(15) In the example of FIG. 4, processing is performed as in (11).

In the above embodiment, a protection relay system which detects an accident in a monitoring section, gives a shutoff command to an appropriate circuit breaker, and cuts off the accident is assumed, but the essence of the present invention is as follows. The device installed in the power system 1
It has a function (topology recognition function) of autonomously recognizing the mutual positional relationship along the power supply path by mutual cooperation. This function is not limited to the protection relay system, but is a system composed of multiple devices, such as a system that uses positional relationship information along the power supply path between each device,
Can be widely applied.

For example, a device called a slave station is installed in a distribution system, and it is conceivable to apply a topology recognition function to this device. This slave station controls opening / closing of the pole switch in accordance with an instruction from the master station. In the event of a power distribution system accident, the root of the power supply path is once cut off, and then switches are turned on sequentially from the end of the distribution line to identify the accident section when the accident recurs. At this time, it is necessary for the master station to know the positional relationship information along the power supply path of each slave station, and at present, work is performed to update the master station database when the slave station is installed or when the system connection status changes. I have. Here, it is conceivable to apply a topology recognition function.
In other words, a system is provided in which a slave station device is simply installed in a power distribution system, autonomously recognizes a positional relationship along a power supply path of each other in cooperation with each other, and reports to a master station. In addition, even when the system connection state changes, the positional relationship can be autonomously recognized again and reported to the master station. As a result, a mismatch between the master station database and the system status can be efficiently prevented.

[0069]

According to the present invention, in a system including a plurality of devices such as a protection relay system and an automatic power distribution system, a system using positional relationship information along a power supply path between the devices is used. At the time of new installation, maintenance, or a change in the state of the power system, it is possible to reliably reflect those changes in positional relationship information along the power supply path between the devices. Also, the present invention
By autonomously recognizing the positional relationship in cooperation between devices, even when the target range of the system is expanded, the C
Without changing specifications such as PU performance and memory capacity,
Since the formation between the devices can be autonomously reconfigured and the system can be expanded simply by installing a standard device, the expandability of the system can be dramatically improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a compact relay system 2 to which the present invention is applied.

FIG. 2 is a diagram schematically illustrating a configuration example of system equipment and a compact relay device for explaining an outline of an operation of a compact relay system 2 to which the present invention is applied.

FIG. 3 is a diagram schematically illustrating a configuration example of system equipment and a compact relay device for explaining an outline of an operation of the compact relay system 2 to which the present invention is applied when a compact relay device is newly installed.

FIG. 4 is a diagram schematically illustrating system equipment, a compact relay device, and a monitoring section for explaining a process of autonomously reconfiguring a monitoring section of the compact relay system 2 to which the present invention is applied.

FIG. 5 is a diagram illustrating an overall flow of a monitoring section reconfiguration process of the compact relay system 2 to which the present invention is applied.

FIG. 6 is a diagram illustrating a rough processing flow in which a newly installed compact relay device of the compact relay system 2 to which the present invention is applied searches for a compact relay device closest to itself.

FIG. 7 is a diagram for explaining a rough processing flow for determining which monitoring section adjacent to the latest compact relay device includes a newly installed compact relay device of the compact relay system 2 to which the present invention is applied; .

FIG. 8 is a diagram illustrating a rough processing flow in which a newly installed compact relay device of the compact relay system 2 to which the present invention is applied updates monitoring section definition information.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Power system, 2 ... Compact relay system, 3 ... Compact relay device, 4 ... Communication network, 5 ... Transmission line, 6 ... Busbar, 7 ... Circuit breaker, 301 ... Sensor part, 30
2. Communication control unit, 303: accident determination unit, 304: accident cutoff unit, 305: carrier wave output unit, 306: carrier wave observation unit,
307: topology recognition unit; 308: monitoring section definition information data unit; 309: control unit.

Continued on the front page (72) Inventor Yasuo Sato 7-1-1, Omika-cho, Hitachi City, Ibaraki Prefecture Inside Hitachi Research Laboratory, Hitachi, Ltd. (72) Inventor Masahiko Amano 7-1-1, Omika-cho, Hitachi City, Ibaraki Prefecture Hitachi, Ltd.Hitachi Research Laboratories (72) Inventor Chihiro Fukui 1-1-1, Omikacho, Hitachi City, Ibaraki Prefecture Hitachi, Ltd.Hitachi Research Laboratory Co., Ltd. No. 2 Inside Hitachi Ltd. Omika Plant (72) Inventor Yoshiaki Matsui 1-1-1 Kokubun-cho, Hitachi City, Ibaraki Prefecture F-term (reference) 5G064 AA09 AC09 CB03 CB19 DA01 5G066 AA09 AE01 AE05

Claims (21)

[Claims] An electric power system comprising a plurality of devices installed on an electric power system for monitoring a state of the electric power system or controlling electric power system equipment, and using positional relationship information of each device on an electric power supply path. In a power system monitoring and control system for monitoring and controlling the power system, a power system monitoring and control system including a positional relationship information acquiring means for acquiring positional relationship information of each device by cooperation between the devices. 2. The power system monitoring and control system according to claim 1, wherein each device includes said positional relationship information acquiring means. 3. The positional relationship information obtaining means includes: a carrier output means for outputting a power line carrier; a carrier observation means for observing a power line carrier; a communication control means for performing inter-device communication; 3. The power system monitoring and control system according to claim 1, further comprising topology recognition means for obtaining positional relationship information by communicating with another device. 4. The topology recognizing means includes a nearest device searching means for searching for a device nearest to the own device on a power supply path, and a device obtained by dividing a power system by the nearest device.
Section determination processing means for determining which side of the three sections (hereinafter, referred to as a section) includes the own apparatus, and generating a positional relationship information by dividing the section including the own apparatus into two sections by the own apparatus. 4. The power system monitoring and control system according to claim 3, comprising section dividing means. 5. The power system monitoring and control system according to claim 4, wherein said nearest device searching means obtains a device closest to the own device by using a result of another device observing a carrier wave output from the own device. 6. The section discrimination processing means calculates a result that another device observes a carrier wave output from the own device and a result that a device other than the nearest device observes a carrier wave output from a device nearest to the own device. 5. The power system monitoring and control system according to claim 4, wherein the system is used to determine which side of the two sections obtained by dividing the power system by the nearest device includes the own device. 7. The apparatus according to claim 1, wherein the section dividing means monitors a carrier wave output from the own apparatus by another apparatus, and a result that a carrier other than the closest apparatus observes a carrier wave output from an apparatus nearest to the own apparatus. Using the result of each device observing a composite wave of a carrier outputted from the own device and a carrier outputted from the latest, a section including the own device is divided into two by the own device to generate positional relationship information. 4 is a power system monitoring and control system. 8. A power system comprising a plurality of devices installed on a power system for monitoring the state of the power system or controlling power system equipment, and using positional relationship information of each device on a power supply path. In the power system monitoring and control system that monitors and controls the power system, in particular, the power system uses the system observation means in which each device observes the electric state quantity of the power system, and the electric system quantity data collected by the system observation means. In the power system protection system including the accident discriminating means for judging the presence or absence of the above accident, the accident shutoff means for sending an open command to the circuit breaker when the accident judging means judges that there is an accident, the positional relationship information of each of the devices is A power system protection system, comprising: a positional relationship information acquiring means for acquiring by cooperation between respective devices. 9. The power system protection system according to claim 8, wherein each device includes said positional relationship information acquiring means. 10. The apparatus according to claim 1, wherein the positional relationship information acquiring means includes a carrier output means for outputting a power line carrier, a carrier observing means for observing the power line carrier, a communication control means for performing inter-device communication, and a power line carrier. The power system protection system according to claim 8 or 9, further comprising topology recognition means for obtaining positional relationship information by output, observation, and communication with another device. 11. The topology recognizing means includes a nearest device searching means for searching for a device closest to the own device on a power supply path, and a device obtained by dividing a power system by the nearest device.
Section determination processing means for determining which side of the three sections (hereinafter, referred to as a section) includes the own apparatus, and generating a positional relationship information by dividing the section including the own apparatus into two sections by the own apparatus. The power system protection system according to claim 10, further comprising a section dividing unit. 12. The electric power system protection system according to claim 11, wherein said nearest device searching means obtains the nearest device to the own device by using a result of another device observing a carrier wave output from the own device. 13. The section discriminating processing means may be configured to determine a result of observation of a carrier output from the own apparatus by another apparatus and a result of observation of a carrier output from an apparatus nearest to the own apparatus by an apparatus other than the nearest apparatus. The power system protection system according to claim 11, wherein the system is used to determine which side of the two sections obtained by dividing the power system by the nearest device includes the own device. 14. The apparatus according to claim 1, wherein the section dividing means monitors a carrier wave output from the own apparatus by another apparatus, and a result that the apparatus other than the closest apparatus observes a carrier wave output from the apparatus nearest to the own apparatus. Using the result of each device observing the composite wave of the carrier output from the own device and the carrier output from the nearest,
The power system protection system according to claim 11, wherein the section including the own device is divided into two by the own device to generate positional relationship information. 15. An electric power system comprising a plurality of devices installed on an electric power system for monitoring the state of the electric power system or controlling electric power system equipment, and using positional relationship information of each device on an electric power supply path. In a power system monitoring and control system for monitoring and controlling power, in particular, each device controls opening / closing of a switch, and at the time of a power system failure, it is determined that the power supply path is at least the root of the power supply path beyond the point of the failure. In the power system monitoring and control system that once shuts off the circuit breaker and then switches on the terminal side switches from the terminal side in order from the terminal side again, the positional relationship information of each of the devices is exchanged between the devices. A power system protection system comprising a positional relationship information acquiring means for acquiring by cooperating with each other. 16. The power system monitoring and control system according to claim 15, wherein each device includes said positional information acquisition means. 17. A positional relationship information acquiring means provided in each of said devices, a carrier wave output means for outputting a power line carrier wave, a carrier wave observing means for observing a power line carrier wave, a communication control means for performing inter-device communication, and a power line carrier wave. 17. The power system monitoring and control system according to claim 15, further comprising topology recognition means for obtaining positional relationship information by output, observation, and communication with other devices. 18. The topology recognizing means includes a nearest device searching means for searching for a device closest to the own device on a power supply path, and a device obtained by dividing a power system by the nearest device.
Section determination processing means for determining which side of the three sections (hereinafter, referred to as a section) includes the own apparatus, and generating a positional relationship information by dividing the section including the own apparatus into two sections by the own apparatus. 18. The power system monitoring and control system according to claim 17, further comprising a section dividing unit. 19. The power system monitoring and control system according to claim 18, wherein said nearest device searching means obtains a device closest to the own device by using a result that another device observes a carrier wave output from the own device. 20. The section discriminating means calculates a result that another device observes a carrier wave output from the own device and a result that a device other than the nearest device observes a carrier wave output from a device closest to the own device. 19. The power system monitoring and control system according to claim 18, wherein the system is used to determine which side of the two sections obtained by dividing the power system by the nearest device includes the own device. 21. The section dividing means, comprising: a result that another device observes a carrier wave output from the own device; a result that a device other than the nearest device observes a carrier wave output from a device closest to the own device; Using the result of each device observing the composite wave of the carrier output from the own device and the carrier output from the nearest,
19. The power system monitoring and control system according to claim 18, wherein the section including the own device is divided into two by the own device to generate positional relationship information.