JP2017163689A - Monitoring control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitoring control device capable of supporting early identification of the cause of an accident.SOLUTION: A monitoring control device comprises: a storage section 121 storing therein an ordinary single-line connection diagram of multiple distribution systems configured by dividing a power receiving facility 2 into predetermined areas and a protective coordination curve for each distribution system; an input/output section 111 to which a signal including an open/closed state of a circuit breaker of the power receiving facility 2 and the presence/absence of a fault is inputted; an accident current information receiving section 124 for receiving accident current information held by a protective relay 2c that is operated in the case where an accident current is generated; an accident current information calculation section 125 for finding a distribution system in which the accident current flows and a protective coordination curve of the distribution system based on the signal and the accident current information; and a parallel display section 131 on which the protective coordination curve of the distribution system in which the flow of the accident current is found by the accident current information calculation section 125, and the ordinary single-line connection diagram of the distribution system in which the accident current flows are displayed in parallel.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a monitoring control device for a power receiving facility.

  Protective relays are installed in power receiving equipment that transmits and distributes power to each facility. Protective relays can detect other accidents quickly due to short-circuit accidents or ground faults occurring at power receiving facilities, and open switches such as circuit breakers and disconnectors that are linked to the protective relay. In addition to preventing spillover accidents in the power distribution system, it is also possible to prevent equipment damage due to accident currents.

  FIG. 5 is a single line connection diagram of the power receiving facility. As shown in FIG. 5, when an accident occurs at the accident point F1, the protective relay OC1 detects the accident, and the circuit breaker CB1 interlocked with the relay OC1 is cut off to prevent the transmission to the upper level. To do. In addition, when an accident occurs at the fault point F2, the protective relay OC2 detects the accident and causes the circuit breaker CB2 that is linked to the relay OC2 to cut off the electric circuit. Does not flow, and can continue to receive power from the top, preventing spillover accidents.

  Protection coordination is maintained between the protective relays installed in the power receiving facility. Protection coordination is to prevent damage to equipment and wiring by operating only the protective relay of the accident circuit and stopping power supply to the accident system when a short circuit accident, ground fault, or overvoltage occurs in the circuit. At the same time, it means that the set value of each protective relay is adjusted so that the power supply to other healthy circuits can be continued.

  As a specific adjustment method, there is “selective interruption by stage time limit” that provides a difference in time until each protection relay operates when an accident current occurs. The stage time limit means that the time until the higher-order protection relay operates is lengthened and the time until the lower-order protection relay operates is shortened. By providing the time difference, the power supply stop range can be minimized. In other words, the protection coordination is to set each protection relay so that there is a difference in the time until each protection relay operates.

  The set values for each protection relay are the short-circuit current (theoretical value) generated at the time of the accident, the operating characteristic curve of each protection relay, the excitation inrush current curve of the transformer of the power receiving equipment, time on the vertical axis, and current on the horizontal axis. It is shown in one logarithmic graph, and the operating characteristic curves of each protective relay do not intersect (there is a time difference in operation), and the operating characteristic curve of the protective relay does not overlap with the magnetizing inrush current curve of the transformer Etc. as conditions. When the operating characteristic curves intersect, the context of the protective relay operation will change, and protection coordination will not work, such as an unintended protective relay operating or a protective relay that should have been operating. It becomes impossible to take out and the spread of the accident cannot be minimized. If the operating characteristic curves intersect, reset the settling value for each protective relay.

  In this way, a log-log graph including the operation characteristic curve of the protection relay capable of taking protection cooperation and having time on the vertical axis and current on the horizontal axis is called a protection cooperation curve. This protection coordination curve is used to check whether the system is moving at a set value.

JP 2001-298848 A

  When a short circuit or ground fault occurs in the power receiving equipment, the monitoring and control device detects the accident and notifies the monitoring personnel. However, in the event of a major power outage or a serious accident that damages the power receiving equipment. It is necessary to investigate the cause.

  However, conventionally, information necessary for investigating the cause has been separately managed and stored, and it has been necessary for a supervisor to individually check each piece of information, and it has taken time to investigate the cause.

  The monitoring and control apparatus according to the present embodiment is made to solve the above-described problems, and an object thereof is to provide a monitoring and control apparatus that can support early investigation of the cause of an accident.

  In order to achieve the above object, the monitoring control device of the present embodiment is a monitoring control device that monitors and controls equipment including a switch and a protective relay installed in a power receiving facility, and places the power receiving facility in a predetermined area. A storage unit storing a single-line diagram of a plurality of distribution systems divided and a protection coordination curve for each distribution system, and a signal including an open / close state of a switch of the power receiving facility and the presence / absence of a failure are input. An input unit, an accident current information receiving unit that receives the accident current information held by the protective relay that was operated when the accident current occurred, and a distribution system in which the accident current has flowed based on the signal and the accident current information And an accident current information calculation unit that determines a protection coordination curve of the distribution system, a protection coordination curve of the distribution system that is determined to have caused an accident current by the accident current information calculation unit, and a distribution system that has an accident current flow Further comprising a parallel display unit for displaying in parallel a line connection diagram, the features a.

It is a functional block diagram of the whole system provided with the monitoring control device of the first embodiment. It is a figure which shows an example of the monitoring screen of a monitoring operating device. It is a flowchart which shows operation | movement of the monitoring control apparatus which concerns on 1st Embodiment. It is a flowchart which shows operation | movement of the monitoring control apparatus regarding the setting value change of a protection relay. It is a figure for demonstrating a prior art.

[1. First Embodiment]
[1-1. Constitution]
Below, the structure of the monitoring control apparatus of this embodiment is demonstrated, referring FIG. 1 and FIG. FIG. 1 is a functional block diagram of the entire system provided with the monitoring control apparatus of the present embodiment.

  The entire system is composed of a monitoring target and the monitoring control device. Here, the monitoring target of the monitoring control device is the power receiving facility 2. The monitoring control device and the power receiving facility 2 are connected by a wired or wireless network, and transmission of each information, signal, and command is performed via the network. A plurality of power receiving facilities 2 may be connected to the monitoring control device.

(Power receiving equipment)
The power receiving facility 2 is a facility that protects the load facility in order to convert the power received from a higher system such as an electric power company into a voltage suitable for the load facility, and to prevent a spillover accident to the load facility in the event of a distribution line accident. is there. Examples of the power receiving facility 2 include a power receiving / transforming facility and a power receiving / distributing facility. Specifically, the power distribution facility 2 includes a switch, a transformer 2b, and a protective relay 2c.

  The switch includes, for example, a circuit breaker and a disconnect switch, and opens and closes the electric circuit. In this embodiment, a switch will be described as a circuit breaker 2a. For example, the circuit breaker 2a is interlocked with a specific protective relay 2c, and interrupts the electric circuit according to an interruption command from the protective relay 2c. Moreover, the circuit breaker 2a transmits a signal including its own open / closed state and the presence / absence of a failure to the monitoring control device. The transformer 2b transforms the electric power received from the host system into a voltage suitable for the load facility. The transformer 2b may transmit failure information to the monitoring control device.

  The protective relay 2c includes various relays such as an overcurrent relay (OCR), a ground fault relay (GR), and an overvoltage relay (OVR). The protective relay 2 c includes a model / setting value information transmission unit 21, a setting value information reception unit 22, an accident current information holding unit 23, and an accident current information transmission unit 24.

  The model / settling value information transmission unit 21 transmits the model of the protection relay 2c itself and the currently set value to the supervisory control device. The model / setting value information transmitting unit 21 transmits a setting value in response to a request from the monitoring control device, for example. The set value information receiving unit 22 receives the change information of the set value for the protective relay 2c from the host supervisory control device, and changes its own set value.

  The fault current information holding unit 23 holds fault current information. The accident current information includes the value of the accident current that has flowed through the electric circuit when the accident current flows due to an accident such as a short circuit or a ground fault, and the interrupt command history to the circuit breaker 2a. The accident current value is held for a predetermined time. For example, the accident current information holding unit 23 holds information for the past 20 s with the fault current value at 10 ms intervals.

  The accident current information transmission unit 24 transmits the accident current information held by the accident current information holding unit 23 to the monitoring control device. For example, the accident current information transmission unit 24 transmits the accident current information when the protective relay 2c detects an accident or when there is a request for transmission of the accident current information from the host supervisory control device 1.

(Supervisory control device)
The monitoring control device includes a single computer or a plurality of computers connected to a network and a display device. The supervisory control device stores programs and databases in HDDs, SSDs, etc., develops them appropriately in the RAM, and processes them with the CPU, thereby creating a protection coordination curve plotting accident current values, which will be described later, and displaying the results Performs necessary calculations such as display on the device.

  Specifically, the monitoring and control device includes a transmission device 11 that transmits information with each of the devices 2a to 2c of the power receiving facility 2, a central processing device 12 that performs predetermined processing based on information received by the transmission device 11, It has a monitoring operation device 13 for displaying the processing result of the central processing unit 12 or for giving a command to the circuit breaker 2a and the protective relay 2c.

  The transmission device 11 includes an input / output unit 111 and a transmission processing unit 112. The input / output unit 111 receives information about the open / close state of the circuit breaker 2a and the transformer 2b and the presence / absence of a failure from each device 2a, 2b, converts the information into a transmission signal and transmits it to the upper transmission processing unit 112. Further, the input / output unit 111 converts a control command transmission signal from the monitoring operation device 13 to the circuit breaker 2a into a contact signal and transmits the contact signal to each circuit breaker 2a.

  The transmission processing unit 112 relays signals between the higher-level monitoring operation device 13 and the input / output unit 111 and also relays information between the higher-level central processing device 12 and the monitoring operation device 13 and the protective relay 2c. .

  The central processing unit 12 stores information necessary for a predetermined process and performs a predetermined process based on the information. Specifically, the central processing unit 12 includes a storage unit 121, a model / setting value information receiving unit 122, a protection coordination curve creating unit 123, an accident current information receiving unit 124, an accident current information calculating unit 125, and an event information display creating unit. 126, a single-line diagram creation unit 127, and a set value change determination unit 128.

  The storage unit 121 stores various information necessary for the arithmetic processing of the central processing unit 12. For example, the storage unit 121 includes a single-line diagram of the power receiving facility 2, a protection coordination curve for each distribution system, an operation characteristic curve of the protection relay 2c, a model and set value information, an operation history and an abnormality history of each device 2a to 2c, Messages such as voice and character information that are generated when an operation or abnormality occurs are stored. The single-line connection diagram is a normal single-line connection diagram of a plurality of power distribution systems obtained by dividing the power receiving facility 2 into predetermined regions. The model and the operating characteristic curve are stored in association with each other.

  Further, the storage unit 121 also stores a correspondence relationship between the operating characteristic curve of the protective relay 2c indicated by the protective coordination curve and the display of the single-line connection diagram of the circuit breaker interlocked with the protective relay. In addition, since the memory | storage part 121 has memorize | stored the operating characteristic curve of the protective relay 2c, it functions as an operating characteristic curve holding part.

  The type / setting value information receiving unit 122 receives the type of the protective relay 2c and the currently set value information transmitted from the type / setting value information transmitting unit 21 of the protective relay 2c. The model / setting value information receiving unit 122 sorts the information on the model and the setting value for each distribution system, and transmits the list to the monitoring operation device 13. The model / settling value information receiving unit 122 may store the received information in the storage unit 121, for example, for each distribution system and in time series order.

  The protection coordination curve creation unit 123 creates a protection coordination curve based on the model, the set value, and the operating characteristic curve of the protection relay 2c. The protection coordination curve is a log-log graph of the current value on the horizontal axis and the time on the vertical axis, and includes an operation characteristic curve of the protection relay 2c. In addition, the protection coordination curve may include a short-circuit current (theoretical value) generated when an accident occurs and a curve of the magnetizing inrush current of the transformer 2b. This protection coordination curve is created for each distribution system. The protection coordination curve creation unit 123 transmits the created protection coordination curve to the monitoring operation device 13. The protection coordination curve stored in the storage unit 121 may be created by the creation unit 123 or may be set in advance.

  The fault current information receiving unit 124 requests the fault current information transmitting unit 24 to transmit the fault current information, and receives the fault current information held by the protective relay 2c that is operated when the fault current is generated in the power receiving facility 2. The fault current information receiving unit 124 stores the received fault current information in the storage unit 121 and transmits the information to the monitoring operation device 13. In addition, the fault current information receiving unit 124 first transmits a request for the interrupt command history to the circuit breaker 2a to the fault current information transmitting unit 24, and from the interrupt command history to the circuit breaker 2a included in the accident current information, It is determined whether 2a is opened. In addition, transmission of fault current information including the fault current value may be requested and received.

  The accident current information calculation unit 125 is based on the signal including the open / close state of the circuit breaker 2a input from the input / output unit 111 and the presence / absence of a failure, and the accident current information input from the accident current information reception unit 124. The distribution system through which the current flows and the protection coordination curve of the distribution system are determined. For example, the accident current information calculation unit 125 collates the disconnection command history to the circuit breaker 2a of the protective relay 2c included in the accident current information with the open / close state of the circuit breaker 2a and the presence / absence of a failure, thereby distributing the power distribution system. And a protection coordination curve. In addition, the accident current information calculation unit 125 plots the accident current value on the determined protection coordination curve, and transmits the plotted protection coordination curve to the monitoring operation device 13. At the time of the transmission, it may be transmitted together with the information of the activated protection relay 2c.

  The event information display creation unit 126 collects event information generated in the power receiving facility 2 via the transmission device 11 and edits the information to be displayed on the monitoring operation device 13. For example, the event information display creation unit 126 has a timeline function, and displays the event information in a list on the parallel display unit 131 described later in chronological order. The event information includes a record of the change in the open / close state (on / off state) of the circuit breaker 2a of all distribution systems, the time of change, the type of protective relay 2c, the set value, and whether or not a failure / abnormality has occurred in all distribution systems. And at least any one of the generation time and the like. The event information display creation unit 126 creates information for causing the event information display unit 133 (to be described later) to display the installed location of the circuit breaker 2a and the protective relay 2c, for each distribution system in which an accident has occurred.

  The single-line diagram creation unit 127 receives a signal including the open / close state of the circuit breaker 2a and the presence / absence of a failure via the transmission device 11, acquires a normal single-line diagram from the storage unit 121, and the open / close state And create a single-line diagram that reflects the presence or absence of failure. At that time, the single-line diagram creating unit 127 may hold the correspondence relationship stored in advance in the storage unit 121 in the single-line diagram. That is, the single-line diagram creation unit 127 is interlocked with the selected protective relay 2c shown in the created single-line diagram by selecting the operation characteristic curve of the protection relay 2c shown on the protection coordination curve by the supervisor. You may make it emphasize the display of the circuit breaker 2a. Examples of this emphasizing method include blinking, a change in the color of the circuit breaker 2a in the drawing, and the like. The single-line diagram creation unit 127 displays the created single-line diagram in the display field of the single-line diagram of the parallel display unit 131.

  As will be described later, the set value change determination unit 128 changes the set value after the change when the set value of the protective relay 2c is changed by the monitor through the monitoring operation device 13 or directly by the worker at the site. Based on this, the protection coordination curve creation unit 123 creates a protection coordination curve, and determines whether a predetermined condition has been met. As the predetermined condition, for example, it is assumed that the operation characteristic curves in the newly created protection coordination curve intersect each other, or the interval between the operation characteristic curves is equal to or less than a predetermined time interval. This predetermined time interval can be set in a range where protection cooperation can be taken, and is set to 20 ms, for example.

  When the set value change determination unit 128 determines any of the above, the set value change determination unit 128 outputs a command to issue an alarm to the monitoring operation device 13. If the set value does not correspond to any of the set values received by the monitoring operation device 13, the set value change determination unit 128 can provide protection coordination to the set value setting change unit 134 using the set value. The signal is output.

  The monitoring operation device 13 displays the processing result of the central processing unit 12, or issues a command to the circuit breaker 2a and the protective relay 2c. For example, a display device such as a display and a mouse, keyboard, touch panel, etc. It includes a user interface. The monitoring operation device 13 is mainly used by a monitoring person. FIG. 2 shows an example of a monitoring screen of the monitoring operation device 13.

  Specifically, the monitoring operation device 13 includes a type / setting value information confirmation unit 130, a parallel display unit 131, a type / setting value information list display unit 132, an event information display unit 133, a setting value setting change unit 134, an alarm unit. 135.

  The type / setting value information confirmation unit 130 inquires whether the type and setting value information of each protection relay 2c is stored in the storage unit 121, and confirms whether the information has been acquired. If it has not been acquired, the type / setting value information confirmation unit 130 controls the type / setting value information receiving unit 122 to request the type / setting value information transmission unit 21 to transmit the type and setting value information. . Further, the type / setting value information confirmation unit 130 prompts the monitoring person to manually input the protective relay 2c that does not support the transmission of the type and the setting value information via a monitoring screen or the like, and the type of the protective relay 2c.・ It functions as a reception unit that receives information on settling values.

  The parallel display unit 131 displays the protection coordination curve and the normal single line connection diagram in parallel for each distribution system. In addition, when the protection coordination curve in which the accident current value is plotted by the accident current information calculation unit 125 is created, the parallel display unit 131 is created by the accident current information calculation unit 125 as shown in FIG. The protection coordination curve and the normal single-line diagram of the distribution system in which the fault current flows are displayed in parallel. As an aspect of parallel display, for example, a list is displayed side by side on one monitoring screen of the display device. They may be arranged side by side or vertically. Further, if the listability is ensured, the protection emphasis curve and the single line connection diagram may be separately displayed on a plurality of displays.

  In addition, when the protection coordination curve in which the accident current value is plotted by the accident current information calculation unit 125 is created, the protection coordination curve in which the accident current value is plotted is displayed in parallel instead of the normal single-line diagram. Alternatively, a normal single line connection diagram and a protection coordination curve on which an accident current value is plotted may be displayed together.

  The model / setting value information list display unit 132 displays a list of the model / setting value information received by the model / setting value information receiving unit 122. The model / settling value information list display unit 132 displays the information separately for each distribution system. The model / settling value information list display unit 132 may be provided in parallel with the parallel display unit 131.

  The event information display unit 133 displays information edited by the event information creation unit 126. For example, the event information display unit 133 may display a list of all event information in chronological order, or may display a list of, for example, the five most recent event information in the display column. The event information display unit 133 is provided in parallel with the parallel display unit 131. As shown in FIG. 2, the event information is displayed in a list together with the protection coordination curve and the single line connection diagram displayed on the parallel display unit 131. The

  The set value setting change unit 134 receives the change of the set value of the protective relay 2c, and when the set value change determination unit 128 determines that the protection coordination is achieved even with the changed set value, the protective relay to be changed A command to change the set value of 2c to the accepted set value is transmitted to the protection relay 2c to be changed. Here, the command is issued via the transmission device 11. Moreover, the set value setting change part 134 outputs the control signal which issues a warning to the alarm part 135, when the change of the set value of the protective relay 2c is received.

  The alarm unit 135 issues an alarm that alerts the monitoring staff. The alarm unit 135 issues an alarm when receiving the control signal from the set value setting / changing unit 134 or when receiving a control signal when a predetermined condition is met from the set value change determining unit 128. The alarm may be voice or text information such as a message displayed on the monitoring screen.

[1-2. Operation]
The operation of the monitoring control apparatus as described above will be described below with reference to FIGS. FIG. 3 is a flowchart showing the operation of the monitoring control apparatus. FIG. 4 is a flowchart showing the operation of the monitoring control device relating to the setting value change of the protective relay 2c. The order of operations in the flowcharts of FIGS. 3 and 4 is an exemplification, and the operation of the present embodiment is not necessarily limited to this order.

(1) Operation of Monitoring and Control Device As shown in FIG. 3, first, the model / setting value information confirmation unit 130 confirms whether information on the model and the setting value has been acquired (step S01). As this confirmation method, for example, information on the model and the set value stored in the storage unit 121 is inquired.

  If it has not been acquired (N in step S01), the type / setting value information confirmation unit 130 determines whether each protection relay 2c supports transmission of type and setting value information (step S02). For each of the protective relays 2c, the type / setting value information receiving unit 122 issues a transmission request, and the type / setting value information receiving unit 122 receives from the protective relay 2c, and takes in the type and setting value information ( Step S03). On the other hand, for the unsupported type, the model / setting value information confirmation unit 130 prompts the monitor to input, and the type / setting value information confirmation unit 130 inputs the type and set value information by manual input by the monitor. (Step S04).

  When the model and settling value information is taken in (Y in step S01, S03, and S04), the type / setting value information receiving unit 122 sorts the list of the model and settling value information for each distribution system to the monitoring operation device 13. Then, the model / settling value information list display unit 13 displays a list of model and settling value information (step S05).

  Next, the protection coordination curve creation unit 123 creates a protection coordination curve for each distribution system from the information of the type / setting value and the operation characteristic curve of the protection relay 2c, and the parallel display unit together with the normal single-line connection diagram. It is displayed on 131 (step S06).

  In addition, check if an accident current has occurred. That is, the fault current information receiving unit 124 determines whether the circuit breaker 2a linked to the relay 2c has been opened from the cut command history to the circuit breaker 2a included in the fault current information (step S07), and has not been opened. In such a case (N in Step S07), it is determined that the current is not a serious accident current, and the process returns to Step S07.

  On the other hand, if it is open (Y in step S07), it is estimated that a serious accident has occurred. Therefore, the accident current information including the fault current value is transmitted to the fault current information transmitting unit 24 by the fault current information receiving unit 124. Is transmitted and the information is received (step S08).

  Then, the fault current information calculation unit 125 determines the distribution system through which the fault current flows and the protection coordination curve of the distribution system, plots the fault current value on the curve, and displays the curve by the parallel display unit 131. A list is displayed in parallel with the normal single line connection diagram of the distribution system (step S09).

(2) Operation when Changing the Setting Value of the Protection Relay Next, the operation when the setting value of the protection relay 2c is changed will be described with reference to FIG.

  As shown in FIG. 4, when the settling value can be changed by the monitoring control device, that is, when the protective relay 2c supports communication with the monitoring control device (Y in step S11), the monitoring control device The set value is changed from the monitoring person by the set value setting changing unit 134 (step S12). This change is a temporary change and has not been transmitted to the protective relay 2c yet. This is because it is unclear whether protection coordination can be achieved by the set value.

  Therefore, the set value change determination unit 128 causes the protection coordination curve creation unit 123 to create a protection coordination curve based on the temporarily changed setting value (step S13), and determines whether a predetermined condition is satisfied (step S14). Here, the determination condition is whether there is a predetermined operation time difference between the operation characteristic curves in the protection coordination curve. If there is no predetermined operating time difference (N in Step S14), since the protection coordination cannot be obtained, an alarm is issued by the alarm unit 135 (Step S15), the process returns to Step S12, and the settling value is set again.

  On the other hand, if there is a predetermined operating time difference (Y in step S14), protection coordination can be achieved, so that the set value change determination unit 128 outputs a signal to that effect to the set value setting change unit 134, and the set value setting change unit 134 Thus, a command to change the set value to a set value that is temporarily changed is transmitted to the protection relay 2c to be changed, and the change of the set value is reflected (step S16).

  On the other hand, when it is impossible to change the set value by the monitoring control device, that is, when the protective relay 2c does not support communication with the monitoring control device (N in step S11), the setting is directly performed by the worker who has visited the site. When the value is changed, the set value after the change is received manually by the monitoring person via the model / setting value information confirmation unit 130 (step S17).

  The set value change determination unit 128 causes the protection coordination curve creation unit 123 to create a protection coordination curve based on the changed set value (step S18), and determines whether a predetermined condition is satisfied (step S19). Here, the determination condition is whether there is a predetermined operation time difference between the operation characteristic curves in the protection coordination curve. If there is no predetermined operating time difference (N in step S19), protection coordination cannot be obtained, so an alarm is issued by the alarm unit 135 (step S20), the process returns to step S17, and the settling value is set again. Note that this resetting involves communicating the set values with the on-site workers.

  On the other hand, if there is a predetermined operating time difference (Y in step S19), the protection cooperation is achieved, and the process is terminated.

[1-3. Action / Effect]
(1) The monitoring and control apparatus according to the present embodiment stores a storage unit 121 in which a normal single-line diagram of a plurality of distribution systems obtained by dividing the power receiving facility 2 into predetermined areas and a protection coordination curve for each distribution system are stored. And the input / output unit 111 to which a signal including the open / close state of the circuit breaker 2a of the power receiving equipment 2 and the presence / absence of the failure is input, and the accident that receives the accident current information held by the protective relay 2c that was operated when the accident current occurred Based on the current information receiving unit 124, the signal and the fault current information, the fault current information calculation unit 125 that determines the distribution system through which the fault current has flowed and the protection coordination curve of the distribution system, and the fault current information calculation unit 125 And a parallel display unit 131 for displaying in parallel the protection coordination curve of the distribution system in which it is determined that the fault current has flowed and the normal single-line connection diagram of the distribution system in which the fault current has flowed.

  Thereby, early investigation of the cause of the accident can be supported. In other words, each information is gathered, and the protection coordination curve of the distribution system in which the accident current has flowed, which is an important document for investigating the cause of the accident for the specialist engineer, and the distribution system in which the accident current has flowed It is possible to support early investigation of the cause of an accident by providing a single line connection diagram in a normal state.

(2) The fault current information calculation unit 125 plots the fault current value included in the fault current information on the determined protection coordination curve, and uses the protection coordination curve in which the fault current value is plotted as the distribution system through which the fault current flows. In addition to the normal single-line diagram, the parallel display unit 131 displays in parallel. As a result, a protection coordination curve in which the accident current value is plotted as an important document for investigating the cause of the accident for a specialist engineer, and a normal single-line diagram of the distribution system in which the accident current has flowed. It is possible to support the early investigation of the cause of the accident by providing the system in an integrated manner.

  Specifically, when an accident current occurs, if the accident current value is plotted on the protection coordination curve, it may intersect with the operating characteristic curve, and the protection relay indicated by the intersected curve is actually Presumed. In other words, the operated relay can be estimated from the presence or absence of an intersection between the fault current value and the operating characteristic curve. By displaying in parallel the protection coordination curve and single-line connection diagram in which such an accident current has flowed, it is possible to centrally understand the state of the substation equipment at the time of the accident and during normal times, and to investigate the cause of the accident early. Can be supported.

(3) A type / setting value information receiving unit 122 that receives information on the type and settling value of the protective relay 2c, an operating characteristic curve holding unit (storage unit 121) that holds the operating characteristic curve of the protective relay 2c, and a type And a protection coordination curve creation unit 123 that creates a protection coordination curve to be stored in the storage unit 121 based on the set value and the operating characteristic curve.

  Thereby, even if it does not memorize | store the protection cooperation curve created by the professional engineer beforehand in a memory | storage part, a protection cooperation curve can be created automatically and a labor and cost can be reduced.

(4) An event information display unit 133 that displays event information including information of the activated circuit breaker 2a or protection relay 2c for each distribution system through which an accident current has flowed, and the event information display unit 133 includes a parallel display unit 131. It was made to provide in parallel. Thereby, since the supervisor can know the operated circuit breaker 2a or the protection relay 2c together with the protection coordination curve and the single-line connection diagram, it is possible to support early investigation of the cause of the accident.

(5) A single-line diagram creation unit 127 that reflects the open / close state of the circuit breaker 2a and the presence or absence of a failure based on the signal is provided, and the storage unit 121 has an operating characteristic curve of the protection relay 2c indicated by the protection coordination curve. And the correspondence relationship between the display of the single-line diagram of the circuit breaker 2a interlocked with the protective relay 2c, and the single-line diagram creation unit 127 operates the operation characteristic curve of the protective relay 2c shown on the protection coordination curve. When is selected, the display of the circuit breaker 2a interlocked with the selected protective relay 2c shown in the single-line connection diagram is emphasized.

  Thereby, it can be made easy to grasp whether the interlocking circuit breaker 2a actually operated by the protective relay 2c that intersects with the plot of the accident current value on the protection coordination curve and is estimated to have operated.

(6) A type / setting value information list display unit 132 for displaying a list of information received by the type / setting value information receiving unit 122 is provided. Thereby, it is not necessary to confirm with the actual device of the protective relay 2c or to check the check sheet at the time of the operation test of the protective relay 2c, and it is possible to manage them centrally on the monitoring control device side. Therefore, there is no discrepancy between the information being managed, the actual machine and the set value, and appropriate protection coordination can be achieved, causing serious system power failure in the event of an accident or serious damage to equipment such as the circuit breaker 2a. Accidents can be prevented.

(7) A model / settling value information receiving unit 122 is provided which includes a type / settling value information receiving unit for manually receiving the model / setting value information of the protection relay 2c that cannot be received. Thereby, even if it is the protection relay 2c which cannot output a model and set value information, since it can be taken in into a monitoring control apparatus, it can manage on the monitoring control apparatus side centrally.

(8) A settling value setting changing unit 134 that receives a change in the set value of the protective relay 2c and transmits a command to change the set value of the protective relay 2c to be changed into the accepted set value to the protective relay 2c to be changed. I was prepared to. Thereby, when there is a change in the set value, it is possible to cope with the change in the set value without having to go to the site as a worker. This is particularly effective when the protective relay 2c is remotely located away from the monitoring control device. For example, in the past, when the power receiving equipment 2 was expanded or remodeled, it was necessary to change the set value locally by an engineer by increasing the load capacity or adding a protective relay 2c. can do.

(9) An alarm unit 135 that outputs an alarm when the set value of the protective relay 2c is changed is provided. As a result, it is possible to call attention to the monitoring staff, and there is no discrepancy between the managed information, the actual machine and the set value, and appropriate protection coordination can be achieved. It is possible to prevent a serious accident that damages equipment such as the vessel 2a.

(10) After the set value of the protective relay 2c is changed by the set value setting changing unit 134, the operation characteristic curves in the newly created protection coordination curve cross each other or the operation characteristic curves are equal to or less than a predetermined time interval. When the settling value change determining unit 128 determines whether or not the operating characteristic curves intersect or the operating characteristic curves are equal to or less than the predetermined time interval, the alarm unit 135 An alarm is output. As a result, even if the settling value is changed, it is possible to make the watcher recognize if the protection coordination is not achieved, so it is possible to promote readjustment of the settling value and prevent a spillover accident in advance. .

[2. Other Embodiments]
In the present specification, an embodiment of the present invention has been described. However, this embodiment is presented as an example, and is not intended to limit the scope of the invention. Specifically, a combination of the first embodiment and the following other embodiments, or a combination of a part of these embodiments is also included. The above embodiments can be implemented in other various forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof as well as included in the scope and gist of the invention.

(1) In the first embodiment, it is assumed that the monitor can view the display of each of the display units 131 to 133 displayed on the monitoring screen, but the restriction level is limited to browsing of the monitoring screen and operation by the monitoring operation device 13. May be provided. That is, the restriction level 1 is not allowed to be browsed and operated, the restriction level 2 is allowed to be browsed, the limit level 3 is allowed to be browsed, and the set value of the protective relay 2 c can be changed by the monitoring operation device 13. By restricting the steps in this way, it is possible to prevent browsing by a non-specialist engineer or change to an incorrect set value.

(2) The time when the fault current value was measured may be included in the fault current information. Thereby, when the accident current value is plotted on the protection coordination curve, the operated protection relay 2c can be accurately grasped by the presence or absence of the intersection with the operation characteristic curve.

11 transmission device 111 input / output unit 112 transmission processing unit 12 central processing unit 121 storage unit 122 type / setting value information receiving unit 123 protection coordination curve creating unit 124 accident current information receiving unit 125 accident current information calculating unit 126 event information display creating unit 127 Single-line diagram creation unit 128 Setting value change determination unit 13 Monitoring operation device 130 Model / setting value information confirmation unit 131 Parallel display unit 132 Model / setting value information list display unit 133 Event information display unit 134 Setting value setting change unit 135 Alarm Part 2 Power receiving equipment 2a Circuit breaker (switch)
2b Transformer 2c Protective relay 21 Model / setting value information transmission unit 22 Setting value information reception unit 23 Accident current information holding unit 24 Accident current information transmission unit

Claims (10)

A monitoring control device that monitors and controls equipment including a switch and a protective relay installed in a power receiving facility,
A storage unit that stores a single-line diagram of a plurality of distribution systems obtained by dividing the power receiving facility into predetermined regions, and a protection coordination curve for each of the distribution systems,
An input unit to which a signal including the open / close state of the switch of the power receiving facility and the presence or absence of a failure is input;
An accident current information receiving unit for receiving the accident current information held by the protective relay operated when an accident current occurs; and
Based on the signal and the fault current information, the fault current information calculation unit for determining the distribution system through which the fault current flows and the protection coordination curve of the distribution system,
A parallel display unit that displays in parallel the protection coordination curve of the distribution system determined that an accident current has flowed by the accident current information calculation unit and the normal single-line connection diagram of the distribution system in which the accident current has flowed,
Providing
A monitoring control device characterized by the above. The fault current information calculation unit plots the fault current value included in the fault current information on the determined protection coordination curve,
The protection coordination curve in which the fault current value is plotted is displayed in parallel with the parallel display unit together with a single line connection diagram of a distribution system in which the fault current flows,
The monitoring control apparatus according to claim 1. A type / setting value information receiving unit for receiving the type and setting value information of the protective relay;
An operating characteristic curve holding unit holding the operating characteristic curve of the protective relay; and
A protection coordination curve creation unit that creates a protection coordination curve for each distribution system based on the model, the settling value, and the operating characteristic curve;
With
The protection coordination curve creation unit stores the created protection coordination curve in the storage unit;
The monitoring control device according to claim 1 or 2. Event information display unit that displays event information including information on operated switches or protective relays for each distribution system in which an accident current flows,
The event information display unit is provided in parallel with the parallel display unit;
The monitoring control device according to any one of claims 1 to 3. Based on the signal, comprising a single-line diagram creation unit reflecting the open / close state and the presence or absence of a failure,
In the storage unit, a correspondence relationship between an operation characteristic curve of the protective relay indicated by the protective coordination curve and a display of a single-line diagram of a switch interlocked with the protective relay is stored in advance.
When the operation characteristic curve of the protection relay indicated on the protection coordination curve is selected, the single-line connection diagram creation unit displays a display of a switch interlocked with the selected protection relay indicated in the single-line connection diagram. Emphasis,
The monitoring control device according to any one of claims 1 to 4. A model / setting value information list display unit for displaying a list of information received by the model / setting value information receiving unit;
The monitoring control apparatus according to claim 3. A model / setting value information receiving unit for manually receiving information on the type / setting value of the protective relay that cannot be received by the model / setting value information receiving unit;
The monitoring control device according to claim 6. A setting value changing unit for receiving a change in a setting value of the protective relay and transmitting a command to change the setting value of the protective relay to be changed to the set value that has been received; ,
The monitoring control device according to any one of claims 3 to 7. When there is a change in the set value of the protective relay, comprising an alarm unit that outputs an alarm,
The monitoring control device according to claim 8. After the set value of the protective relay is changed by the set value setting change unit, the operation characteristic curves in the newly created protection coordination curve cross each other, or the operation characteristic curves are equal to or less than a predetermined time interval. A determination unit for determining whether or not
When the determination unit determines that the operation characteristic curves intersect or the operation characteristic curves are equal to or less than a predetermined time interval, the alarm unit outputs an alarm;
The monitoring control device according to claim 9.

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