JPH0311944A - Automatic display method and apparatus for monitoring distribution system - Google Patents

Abstract

PURPOSE:To perform recovery work accurately in short time upon power interruption due to fault on distribution line, by displaying or printing difference between the present state of distribution system and the state of distribution system before power interruption and then performing recovery work while comparing them. CONSTITUTION:Upon selection of 'member station state storage', preset items of time and distribution system are stored in inner or outer data memory 37 of a computor 32. Upon selection of 'state change member station table print', the computor 32 compares the preset items of present distribution system with preset and stored items and extracts data concerning to a section switchgear 11 having state change. Then the extracted data are printed on a printer 36 thus preparing a table.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention uses a display screen (CRT , liquid crystal projection type, etc.).

[Conventional technology]

Maintaining a constant grasp of the status of the power distribution system is one of the important matters for stable power supply. In other words, in the event of a disaster such as a typhoon, power distribution systems are often damaged over a wide area, so it is necessary to accurately and quickly grasp the situation, inform users, and take recovery measures.

The power distribution system is spread over a wide area, and as a means of understanding and understanding the situation, power outage sections, power transmission status, and restoration status are displayed, allowing multiple parties to visually understand the situation at once. There is a need for a distribution system monitoring system that can

On the other hand, in power distribution systems in urban areas, large-scale power distribution networks and remote control devices are installed to automatically switch the power distribution network in the event of an accident, including power interchange processing, but this method requires manual power and output. Because the amount of information is large and the processing program is complex, the costs for hardware equipment and software are also large, making it economically unreasonable to apply this to local power distribution systems. Moreover, this local power distribution system has a vast power distribution area, and there is an urgent need to improve the quality of power supply to this area.

In response to these demands, conventional devices that display on display screens for local power distribution system monitoring input information according to moment-by-moment changes in the status of each display element of the power distribution system.
It was to be displayed on a display screen.

A general distribution line system will be explained with reference to FIGS. 2 to 5. FIG. 3 is a block diagram showing an example of a general power distribution line. In the figure, l is the primary substation, and the power stepped down by the transformer 2 is transferred to the outlet circuit breakers 3 (3-1 to 3-4) of the -th substation 1, and the transmission lines 4 (4-1, 4). -2)
is sent to the secondary substation 5 through the

In the secondary substation 5, the receiving TL21! Disconnector 6 (6-1, 6
-2), transformer 7 (7-1, 7-2), secondary circuit breaker 8 (8-1, 8-2) of transformer 7, bus bar 9 (9-1, 9-
2), Power distribution circuit breaker (hereinafter referred to as PCB') 10 (1
0-1 to 1O-5), and section switches IH11-1 to 1
distribution section 12 (12-1 to 12-1)
5). The circuit breaker 13 that connects the busbars 9-1 and 9-2 is closed when the transformer 7-1 or 7-2 fails and power is supplied from the other transformer 7-2 or 7-1. And it's always open.

The power distribution circuit breaker 10 is a circuit breaker that connects the bus bar 9 and the power distribution line 12, and has a function of automatically shutting off the power when a short circuit or a ground fault occurs in the power distribution line 12. Even if the bus voltage disappears, the circuit will not open automatically.

Further, the division switch 11 is a switch that divides the distribution line 12 and connects each distribution section to each other, and has a function of automatically opening the circuit when the line voltage disappears. There is a time delay of several milliseconds to several looms until a no-voltage state in the distribution line is detected and the circuit is automatically opened for reasons such as mechanical reasons and measures against instantaneous power outages.

In Fig. 3, to explain the case where an accident occurs on the power transmission line 4-1, the exit circuit breaker 3-1 of the -th substation 1
The circuit is automatically shut off for -degrees, and then automatically closed again after a certain period of time (this is called automatic re-closing).

This fixed time period is generally set to about several seven to sixty seconds depending on the power transmission voltage and line conditions.

When the exit circuit breaker 3-1 automatically recloses, if the accident still continues, it will automatically shut off again (this is referred to as a failure to reopen). In the event of a failure in reopening, no further automatic re-closing will be performed, and the circuit will be closed manually by a worker after the accident has been recovered. Furthermore, if the fault has already disappeared when automatic re-closing is performed, the re-closed circuit breaker 3-1 remains closed and transmits power to the secondary substation 5 (this is referred to as a successful re-closing). .

Figures 4 and 5 show accident F on power transmission line 4-1 in Figure 3.
This is an example of the state of the sectional switch 11 when a power retransmission state occurs after a power retransmission state occurs. FIG. 4 shows an example of a momentary power outage (several cases) due to successful automatic restart, and FIG. 5 shows an example of a case where the time until power retransmission was longer than in FIG. 4.

In FIG. 4, since the busbar no-voltage time was instantaneous, the section switch 11
Some of 1 are open circuits. Sectional switches 11 that are open are indicated with an X mark added thereto. A1 represents the power outage range after power restoration. In FIG. 5, since the bus bar voltage-free time was relatively long, all the section switches 11 connected to the bus bar were open. A2 represents the power outage range after power restoration. The restoration operation of these open section switches 11 is as follows:
Remotely controlled from the power distribution control room.

In the above case, in the case of FIG. 4, the section switch whose automatic opening time is shorter than the reopening time of the outlet circuit breaker 3-1 is opened. In addition, the voltage drop on the distribution line from the occurrence of an accident to the opening of exit circuit breaker 3-1 will be affected by the voltage drop at the end of the distribution line, as the line impedance increases towards the end of the distribution line. The device tends to open quickly. In the figure, the open section switch 11 is indicated with an X mark. A1 represents the power outage range after power restoration in this case.

In the case of Fig. 5, the exit circuit breaker 3-1 in the -th substation 1
The restart time of the sectional switch 11 was set to a relatively long time of several seconds or more, and the busbar voltage-free time was long (several seconds or more).
ms), all the section switches 11 connected to that bus become open. A2 represents the power outage range after power restoration in this case. The restoration operation of these open circuit switches 11 is remotely controlled from the power distribution control room.

Figure 2 shows an example of the configuration of a monitoring system in a general power distribution system.
The P CBIO 1 bus voltage and bus current detector 14, the section switch 11, and the power distribution control room 30 are provided, and a signal transmission path connecting these is shown.

The information on the bus voltage and bus current detected by the voltage and current detector provided on the bus 9 is sent as a TM multiplied signal, and the FC
The information on whether the BIO is in an open circuit state or a closed circuit state is signaled by SV times,
The signal is transmitted via the SV and TM transmitter 20, and the signal line 24, S
The signal is inputted to a central processing unit (computer) 32 via a V, TM receiving device 33 and an input/output device 34. computer 3
Each piece of information entered manually can be called up to the CRT display device 35 as needed to display the status of the bus voltage, bus current, PCB, etc. In addition, information on the open and closed states of the section switch 11 is transmitted to the slave stations 21 (21-1 to 2l-
15), signal line 22, master station 31, signal line 23
After that, it is manually inputted to the computer 32. computer 3
Each piece of information manually entered into 2 is transferred to the input/output device 34 as necessary.
It is possible to call the CRT display device 35 via the , and display the status of the section switch, such as open circuit or closed circuit.

Manual remote operation of opening and closing of the sectional switch 11 is performed by the operation console 3.
This is done using switch 8. When the switch on the operation console 38 is operated to indicate the target sectional switch 11 and the operating direction of opening or closing, the operation signal is transmitted through the master station 31 to the slave station 2I of the target sectional switch 11. be done. The slave station 21 operates the section switch 11 according to the instructed opening or closing signal.

As described above, the opening and closing signals for the sectional switch 11 after operation are manually transmitted from the slave station to the computer 32 through the master station.

35 is a CRT display device, 36 is a printer, and 37 is an external data memory. By operating the switches on the operation console 38, various data input to the computer 32 and the status of the power distribution system after calculations based on the various data can be displayed on the CRT display device 35, printed on the printer 36, and external data can be displayed. It can also be stored in the memory 37.

Here, the SV double signal monitoring signal) is a signal indicating whether the FCBIO is in an open circuit state or a closed circuit state, and the TM double signal telemeter signal) is a signal that indicates whether the FCBIO is in an open circuit state or a closed circuit state. This is the processed signal.

The section switch 11 is connected to the distribution line 12 as shown in FIG.
A plurality of 1-1.11-2.11-3... are installed, and with this divisional switch 11, the distribution line 12 is connected to 12-1
．． 12-2.123...Me is divided into sections, and power is supplied from each section of each section of the divided distribution line to each power consumer.

This section switch 11 includes slave stations 21-1 and 21, respectively.
2, 21-3... are attached, which control the opening and closing of the sectional switch 11, and take in the open circuit and closed circuit status signals,
It is configured to transmit to the master station 31. In the event of a power outage, the slave station 21 also opens the section switch 11 before the power outage,
It is designed to send open and closed signals of the closed circuit state to the master station.

The master station 31 transmits open/close control signals for the section switch 11 to the slave station 21 through the signal line 22, and controls the section switch 11 via the slave station 21. In addition, the section switch 11
Information on the open circuit and open circuit state of the terminal is received from the slave station through the signal line 22. The received signal is immediately input to the computer 32.

The computer 32 is connected to the parent 831. A signal for controlling the opening and closing of the section switch 11 is outputted via the slave station 21, and a detection signal indicating the open or closed state of the section switch 11 is taken in via the slave station 21 and the master station 31.

The power supply voltage and current of the bus 9 transmitted from the SV and TM receiving device 33c, the SV and TM transmitting device 20, and the FCB
A detection signal indicating whether the IO is open or closed is received through the signal line 24, and this signal is further transmitted and input to the computer 32 through the signal line 24 and the input/output device 34.

Various data taken into the computer 32 and the status of the power distribution system after calculations based on the various data can be displayed on the CR1 display device 35 by operating switches on the console 38.

As in the examples in Figures 4 and 5, if there is instantaneous or long-term no-voltage on the bus due to an accident on a power transmission line, immediately close the sectional switch that is open due to no-voltage as soon as the bus is overloaded. There must be. This is called a recovery operation. Also,
By opening and closing the sectional switch 11,
Although the sections 12 are connected, the state of this connection is not fixed, and the connection is changed as appropriate depending on the size of the load (section) at that time.

Therefore, operators in the power distribution control room 30 must constantly monitor the presence or absence of bus voltage in preparation for the occurrence of an accident, and must memorize the standard connection state of the sectional switch 11. .

In addition, the number of section switches 11 is large, and it is necessary to process them in a short time, and the effort required to restore them is enormous.
Therefore, it is not uncommon for the sectional switch 11 to be operated erroneously.

[Problem to be solved by the invention]

In this way, conventional on-screen display devices for local power distribution system monitoring store the state before an accident occurs, compare it with the current state, and display the difference. There was no function such as printing. Therefore, the state of the power distribution system when it was healthy before the accident occurred,
It was not possible to accurately grasp changes in the slave station status by comparing it with the current distribution system status. In addition, it was not possible to know whether the sectional switch switch was cut back (to restore the original state) properly, and even if the switch failed to cut back and the loop power distribution status remained, it was difficult to check. . Therefore, when implementing accident recovery measures, only the current state of the power distribution system is known, and the healthy state of the power distribution system before the accident is unknown, which poses a problem in that restoration takes time.

Furthermore, it is economically unreasonable to apply a large-scale and complicated remote control system as in urban areas.

The purpose of the present invention is to monitor the local power distribution system using simple equipment and simple software, quickly detect the sectional switch to be operated in the event of an accident, and perform recovery operations accurately and quickly. The object of the present invention is to obtain a control method and device that can be performed on time.

[Means to solve the problem]

In order to achieve this objective, the automatic display method for power distribution system monitoring of the present invention uses the "slave station state memory" of the operation switch to store the reference slave station status in advance when displaying the display elements of the power distribution system on the display screen. ” is temporarily stored in the data memory section,
Calculations are made for items whose current status is different from each stored item, and by selecting ``extract state variable station'' with the operation switch,
The present invention is characterized in that information about the slave station whose memory state has changed is output on the display screen or to a printer or the like.

Further, the automatic display device for power distribution system monitoring of the present invention is a device that displays the status of display elements of a power distribution system on a display screen.
Depending on your selection, please refer to 1. a data memory unit that compares each stored item of the display element with the current state; and a means for comparing the stored items of the display element with the current state; The present invention is characterized by comprising a means for outputting the output on the display screen or to a printer or the like by selecting "state change station extraction" with an operation switch.

[Effect]

In the present invention, the normal state of the power distribution system before the power distribution line accident is used as a reference state, and this state is stored in advance by human operation in the internal or external data memory of the convenience store, and the power distribution line accident recovery is performed. When necessary, recall the stored power distribution system status, compare it with the current status, or extract the changed status, display it on a display screen such as a CRT, or print it out. Recovery operations are performed while understanding the current state of change.

As a result, it is possible to carry out accident recovery operations on distribution lines accurately in a short time, reducing the effort required for recovery operations, increasing the precision of operations, and ensuring a stable supply of power.

〔Example〕

The present invention will be specifically explained below based on the embodiment shown in FIG. FIG. 1 is a flowchart showing the operating procedure of the automatic display device for power distribution system monitoring according to the present invention. The configuration of the power distribution line system, the monitoring and control device, the configuration of the signal transmission path, etc. will be explained using the configurations shown in FIGS. 2 to 5 as examples.

A column 40 in the figure is an operation flowchart, and a column 41 indicates switch operations on the console 38 and operations of the printer 36. Further, MA42 represents the content displayed on the CRT screen.

Now, operate according to this flowchart.

The automatic display device for power distribution system monitoring is activated by operating the power switch on the operation console 38, and first, in order to request 43 to display the slave station status memory selection menu 2-, the slave station status memory selection menu on the operation console 38 is activated. Turn on the switch (44 in Figure 1)
). Then, CRTii! ! On the i-side 45, there are ``memory of the upper status of the face 5'' 46 and ``printing of the status change station'' (47 in Fig. 1).
) will be displayed.

Next, a selection is made as to whether or not to store the slave station status (48 in FIG. 1). To select slave station state memory, operate the mouse 49 to move the cursor 50 on the CRT screen, align the cursor 50 with the logo mark 51 at the beginning of the sentence "Slave station state memory", and turn on the mouse 49. .

Then, the computer 32 displays the time (year, month, day, hour, minute) and the preset items of the power distribution system at that time.
The data is stored in the internal or external data memory 37 of the .

Also, if you do not select "Status memory", select whether or not to print the status of the slave station (Figure 1, 52).When you select "Status status memory" The user operates the mouse 49 to move the cursor 50 on the CRT screen, aligns the cursor 50 with the logo mark 53 at the beginning of the sentence ``Status change station - print'', and turns on the mouse 49. Then, calculations are performed in the computer 32, and the preset items of the power distribution system at that time (currently) are compared with each item that has been preset and stored as described above, and it is determined whether a change has occurred. The section switch 11 is extracted, outputted, and printed by the printer 36 to create a list.

Table 1 shows the format of the printed list. Further, an example of the calculation results is shown in Table 2.

In the above, in addition to being output to the printer 36, the "state change station list" may be displayed on a screen such as a CRT, in which case,
The screen display can have a plurality of display screens so as to display the current status and status change list respectively.

In Table 2, the time (year, month, day, hour, minute) when the slave station status was recorded is displayed outside the table. And in the table,
The stored contents are displayed in the right column, and the right column shows
The current contents are displayed. For example, for switch number 111A111, the right column is [Normal].

[Unlocked], [Δ], [Both], [Person], and [Existence] are stored data, whereas the current status in the right column is [Normal].
, [Lock], CCE, C piece], [Cut].

〔Yes〕, and for all the set items, ``
Only two items, ``Slave station abnormality'' and ``Reply,'' have their current status ``Normal'' and ``Present,'' compared to the memory status ``Normal'' and ``Present,'' but no changes have occurred for the other items. Change is occurring.

In addition, when switch number 111A120 is compared in the same manner as switch number 111A111, "slave station abnormality" is detected.
, "Reply", and "Power Direction", the memory status of the three items is [Normal], [Present], [A], and the current state has also changed to [Normal], [Present], [A]. However, changes have occurred in other items.

Further, switch number 111a 130 indicates a case of "slave station abnormality". If the slave station is abnormal, only "slave station abnormality" is transmitted, and other information cannot be transmitted. In this case, the ``Reply'' field will show ``Yes,'' but the computer determines that the human input information for the other items is unreliable, and displays the stored status as is. This may differ from the actual situation. In this case, these columns are indicated by "-" in Table 2 (column 1117130 in Table 2). If the power to the slave station is lost, the slave station will not operate at all and there will be no reply. In this case, ``None'' is displayed in the ``Reply'' column, and the other items are determined by the computer and human information is not reliable, and the stored state is displayed as is.

As above, in Table 2 these columns are indicated by "-".

In addition, after selecting "Memory of child station status", select "Status change child station -
If there is no change in the status of the slave station within the period of time before you select "Print", nothing will be printed.

In the above, a CRT display device is exemplified as a device for displaying on a display screen, but other display devices that are generally operated by computer output signals, such as liquid crystal display devices and projection display devices, are also available. It is possible to achieve the object of the present invention by using any method. Further, it is also possible to use a plurality of display devices and display different contents at the same time.

〔Effect of the invention〕

As described above, according to the present invention, in a display device for power distribution system monitoring, the display state is arbitrarily stored in the data memory section as needed, and at a certain point the current state differs from the stored state. Items can be displayed on a CRT display device or printed using a printer as needed. As a result, in the event of a power outage due to an accident on a power distribution line, the differences between the power distribution system status before the power outage and the current power distribution system status can be displayed, and if necessary, the difference can be printed out using a printer and the two can be compared while recovering. Since the work can proceed, recovery operations can be performed accurately and in a short time.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing the processing of the automatic display device for power distribution system monitoring according to the present invention, FIG. 2 is a block diagram showing the configuration of a monitoring method in a general power distribution system, and FIG. A block diagram showing an example, Figure 4 is a block diagram showing a momentary power outage due to successful automatic restart in the power distribution system, and Figure 5 is an example of a case where the time until power retransmission is longer than in the case of Figure 4. FIG. Primary substation 2; Transformer 3 (3-1 to 3-4): Exit circuit breaker 4 (4-14)
-2): Transmission line 5: Secondary substation 6 (6-1, 6-2): Power receiving circuit breaker 7 (7-1, 7-2): Transformer 8 (8-1, 8-2): Secondary circuit breaker 9 (9-19-
2): Bus bar 10 (10-1 to 1O-5): Distribution circuit breaker (CB)
11 (11-1-11-15): Sectional switch 12 (1
2-1 to 12-15): Distribution section 13: Circuit breaker 14 (14-1 to 14-5): Detector 20: SV, T
M transmitting device 21 (21-1 to 2l-15): Slave stations 22 to 24: Signal line 30: Power distribution control room 31; Master station 32; Central processing unit (computer) 33: SV,
TM receiving device 34: Input/output device 35: CRT attachment 36: Printer 37: External data memory 38: Operation console

Claims (1)

[Claims] 1. When displaying display elements of a power distribution system on a display screen,
In advance, the standard slave station status is temporarily stored in the data memory section by selecting "Slave station status memory" with the operation switch, and calculations are made for items that differ from each stored item and the current status.
An automatic display method for monitoring a power distribution system, characterized in that information about a slave station whose memory state has changed is output on the display screen or to a printer or the like by selecting "extract status change slave station" with an operation switch. 2. In a device that displays the status of display elements of a power distribution system on a display screen, a data memory section that temporarily stores a reference slave station status by selecting "slave station status memory" of an operation switch, and the stored display element. means for comparing each item with the current state, and when the previous state and current state of the display element are different, the calculation results for the different items are calculated by selecting "extract state variable station" with the operation switch. An automatic display device for monitoring a power distribution system, comprising means for outputting on the display screen or to a printer or the like.