JPS6053528B2 - Power system monitoring device - Google Patents

Description

[Detailed Description of the Invention] The present invention provides the following features:
The present invention relates to a power system monitoring device that monitors power demand.

Conventionally, this type of device has adopted a configuration as shown in FIG.

The distribution system consists of distribution line exit disconnectors (hereinafter referred to as disconnectors) at distribution substations 1-11, 1-21, ..., sections (consumer gathering points) 2-11, 2-12,...2-2
1, 2-22, ..., section switches 3-11, 3-12
, 3-21, 3-22, . . . and distribution lines that interconnect these. And the opening/closing status of the breaker 1-11, 1-21,... and the breaker 1
-11, 1-21, . . . The distribution line current detected by the current transformers 4-11, 4-21, . . . -21, . . . are used to transmit to the remote monitoring device master station 6 installed in a control center located in a remote location. The remote monitoring device master station 6 is the slave station 5-1
The disconnector 1- transmitted from 1, 5-21,...
11, 1-21, . . . and the distribution line current are sent from the master station 6 to the system monitoring panel 7, where they are displayed on lamps and ammeters. In addition, section switches 3-11, 3-12,
. . , 3-21, 3-22, . . . open/close circuit states are determined by the remote monitoring and control device slave stations 8-11, 8-12, . . . , 8-
21, 8-22, . . . and detects it at the remote monitoring device master station 6.
Remote monitoring device master station 9 of the control center installed with
is being transmitted to. The transmitted section switch 3-11,
The open/close status of 3-12, . . . 3-21, 3-22, . Ru. On the other hand, a certain section switch 3-11, 3-12, . . . 3-21, 3-22, .
... and an operation signal for it (open or close operation signal), the signal enters the remote monitoring and control device master station 9 and is then sent to the section switch 3-11, 3 specified on the operation console 10.
-12, . . . 3-21, 3-22, . . . corresponding remote monitoring and control device slave stations 8-11, 8-12, . . . , 8-
An open or close signal is transmitted to the section switches 3-11, 3-12, . . . 3-21,
3-22, . . . are opened or closed. Therefore, for example, if an overloaded distribution line occurs in the above distribution line group, or if distribution line construction is performed, the section connected to the overloaded wiring or the construction distribution line may be disrupted due to power supply outage, etc. In order to prevent this from happening, section switches 3-11, 3-12, ... 3-21, 3-22, etc. are opened and closed in order to reconnect some or all of them to other distribution lines. It becomes necessary to operate.

This connection switching operation is not performed randomly, but by estimating the load size (determined by power or current) in each section, and
Comparing this with the current load value of each distribution line, section switches 3-11, 3-12, .
-21, 3-22, etc. must start opening/closing operations. However, it is difficult to perform the above-mentioned section connection change operation. However, it is extremely difficult to estimate this with high accuracy using conventional equipment, and for this reason, only empirical intuition has been relied on. It's on.

This is because the number of sections managed by one control center is generally only a few! 100-100Cg. Installing a current transformer in each section and detecting the section load is problematic in terms of capital investment. ), each has different power demand characteristics. The present invention has been made in view of the above-mentioned circumstances, and eliminates the need to determine the size of the section load based on empirical intuition. The present invention provides an electric power system monitoring device that monitors household load (collection point load).

An embodiment of the present invention will be described below with reference to FIG.

In addition, in this figure, the same parts as in FIG. 1 are given the same reference numerals and will be explained. That is, in the device of the present invention, the cutter 1
-11, 1-21, section (consumer gathering point) 2-11,
2-12,..., 2-21, 2-22,..., section switch 3-11, 3-12,...3-21, 3-22,...
, current transformers) 4-11, 4-21, . . ., remote monitoring device slave stations 5-11, 5-21, . . ., remote monitoring device master station 6,
System monitoring panel 7, remote monitoring and control device slave stations 8-11, 8-1
2, . . , 8-21, 8-22, . . . and the power distribution system of the remote monitoring and control device master station 9, etc., are the same as those of the conventional device. A connection configuration is adopted. The differences in this device from Figure 1 are the opening and closing states of the breakers 1-11, 1-21, the distribution line current, and the section switches 3-11, 3-12, ... 3-21, 3.
The opening/closing status of -22, .
Furthermore, a display command console 12 is connected to this power system monitoring device 11, and this display command console 12 also has the functions of the operation console 10 shown in FIG.
-21, . . . and a section load display lamp that displays each section load of the designated distribution line transmitted from the power system monitoring device 11. Each component of the apparatus shown in FIG. 2 will be specifically explained below. First, the line disconnectors 1-11 and 1-21 connect the distribution bus and the distribution line, and are connected to the section 2-11 (gathering point of distribution customers).
, 2-12,..., 2-21, 2-22,... are distribution sheath breakers 1-11, 1-21 or section switches 3-11
, 3-12, . . . 3-21, 3-22, . . . This section switch 3-11
, 3-12, . . . 3-21, 3-22, can be opened and closed in sections 2-11, 2-12, . . .
2-21, 2-22, . . . power outage and power transmission. The current transformers 4-11, 4-21, .
-21,... will be introduced. Remote monitoring device slave station 5-11
, 5-21, is a power distribution sheath disconnector 1-11, 1-21, ・
Opening/closing status and current transformers 4-11, 4-21,...
The distribution line current from ... is transmitted to the remote monitoring device master station 6. The remote monitoring device master station 6 is the remote monitoring device slave station 5-11, 5.
-21, ... is transmitted from the power distribution sheath disconnector 1-
11, 1-21,... and current transformer 4-11,
4-21, . . , are transmitted to the system monitoring panel 7 and the power system monitoring device 11. On the other hand, remote monitoring and control device slave stations 8-11, 8-12, ..., 8-21,
8-22, . . . receive the section switch operation signal output from the remote monitoring and control device master station 9 and operate the section switch 3-11.
, 3-12,...3-21, 3-22,..., and also section switches 3-11, 3-12,...3
-21, 3-22, . . . to the remote monitoring and control device master station 9 at all times. This remote monitoring and control device master station 9 is connected to the section switches 1-11 from the display command console 12.
, 1-12, . . . and transmits the selection operation signals to the corresponding slave stations 8-11, 8-12, . . . , 8-21, 8-22.
,... and the slave stations 8-11, 8-12,...
, 8-21, 8-22, . . . section switches 3-11, 3-12, . . . 3-21, 3-22.
,..., and transmits this to the system monitoring panel 7 and the power system monitoring device 11. This system monitoring panel 7 receives power from the remote monitoring device master station 6 and the remote monitoring and control device 9, including power distribution sheath disconnectors 1-11, 1-21, section switches 3-11, 3-12, etc.・3-21, 3-22,...
・Displays the opening/closing status and distribution line current, and also displays the processing results of the power system monitoring device 11. When this power system monitoring device 11 receives a display command from the display command console 12, it transmits a display command from the remote monitoring device master station 6 to the disconnector 1-1.
It is determined from the open/closed states of the section switches 1-11, 1-21,... designated to be displayed whether they are in the closed state, and if they are in the closed state, the section switches 3- 11,3-1
2, ... 3-21, 3-22, ... detects the section connected to the specified display or disconnector 1-11, 1-21, ..., whether it is in an open state. If so, the disconnector 1
-11, 1-21, . . . are treated as old and terminated. The display command console 12 has the functions of the operation console 10 shown in FIG.
, 1-21 section switches 3-11, 3-12, .
・・3-21, 3-22,, section 2-11, 2-12,
The connection status of ..., 2-21, 2-22, ... and each section 2-11, 2-12, ..., 2-21, 2-22, ...
It also has the function of displaying the current electricity demand in... In addition, the sections 2-11, 2-12, ..., 2-21, 2 connected to the line breakers 1-11, 1-21, ... and the section switches 3-11, 3-21 -22,...
* is automatically determined at the time of construction of the distribution line, and the connection relationship is coded as shown in Tables 1 and 2 and stored in the power system monitoring device 11 in advance. However, *In the current open/close state, 1 indicates a closed circuit, and 0 indicates an open circuit. That is, the first
Table 2 shows the connection relationship in the distribution line in Figure 2 and 1-
11, 1-21, ... section switch 3-11, 3-12
,... Table 1 shows the opening and closing states of the bridges and disconnectors 1-11, 1-21,... and the sections connected to them 2-11, 2-12,..., 2-21, 2-22,・
...and the current open/close status of the disconnectors 1-11, 1-21, etc. Table 2 shows the current open/close status of the section switches 1-11, 1-21, etc.
-12,...3-21,3-22,... and the sections connected to this 2-11,2-12,...,2-21,2
-22,... and section switches 3-11, 3-12,...
. . 3-21, 3-22, . . . represent the current open/closed states.

Section switch 3-11, 3-12, ... 3-21, 3-
Sections 2-11, 2-12, etc. connected to 22,...
, 2-21, 2-22, ... are each section switch 3-11
, 3-12, ... 3-21, 3-22, ... are two sections, a starting end side section and a terminal end side section, but the division between the starting end side and the ending end side is merely a convenient division for explanation. It has no special meaning. Also, the line disconnectors 1-11, 1-2 input from the remote monitoring device master station 6 and the remote monitoring control device master station 9
1,..., section switch 3-11, 3-12,...3-
The open/close states of 21, 3-22, etc. are stored in Table 1 and Table 2 each time they are input. Therefore, the shield breakers 1-11, 1-21, ... and section switches 3-11, 3-12, ... 3-21, 3- in Tables 1 and 2
The open/close states of 22, . . . represent the current open/close states. Then, the above open/close states (Table 1,
Section switches 3-11, 3-12, . . . 3 connected to the line breakers 1-11, 1-21, . -21,3-2
2,... can be detected.

The detection results are shown in Table 3. Also, Table 3-1 ~ Section 3-
Table 6 shows the progress until obtaining the detection results in Table 3. Below, in Table 3, the breaker 1-11 in Figure 2
An example in which 1 is specified to be displayed will be explained.

Now, the breaker 1-11 is in a closed circuit state as shown in Table 1, and its connection point section 2-11 is in a power transmission state. However, it is assumed that power is constantly being transmitted to the breaker 1-11. If the edge breaker 1-11 is in an open state, the section 2-11 connected to the edge breaker 1-11 is disconnected. Section 2-1
If 1 is in power transmission state, breaker 1-11, section 2-1
1 is registered in Table 3 (see Table 3-1). Next, the third
-1 Extract section 2-11 registered in table. In the case of this example, section 2-11 is extracted. Section switches 3-11, 3-12 connected to this extracted section 2-11
, 3-21, 3-22, . . . from Table 2. This can be done by finding the same code as for section 2-11 from the "starting section column" and "terminating section column" in Table 2.
The section switch registered in the section switch column is section 2.
-11. The number of section switches that can be connected is not limited to one. Among the section switches found in this way that can be connected, those whose open/close state is "closed" become the section switches actually connected to section 2-11. In this example, section switches 3-11 are detected. Among the currently connected section switches detected in this way, only those that are not registered in Table 3 (see Table 3-1) are registered in Table 3 (see Table 3-2). ).
Next, section switch 3-11 newly registered in Table 3-2
Search Table 2 for the section where electricity is transmitted by.

If you find the same code as section switch 3-11 in the section switch column of the same table, you can find the code in the "starting end section" column.
゜The section registered in the "Terminal side section" column is the section where power is transmitted by the section switch 3-11.In the case of this example, sections 2-11 and 2-12 are detected, but this Of these, section 2-12 is not registered in Table 3 (Table 3-2)
is newly registered in Table 3 (see Table 3-3). Then, search Table 2 for the section switch that can be connected to section 2-12 that is currently closed, and search for section switches that can be connected to section 2-12 that are currently closed.
-Register unregistered section switches in Table 3 (see Table 3). In this example, section switch 3-12 is registered (3-4
(see table). As described above, by sequentially tracing the connection relationship between the currently closed section switches and sections from Table 2 and repeating this process until there are no section switches to be registered in Table 3, it is possible to find
11, all sections where power is being transmitted can be detected, and the final results as shown in Table 3 can be obtained. When searching Table 2 for connection section switches for a certain section, it may be necessary to register a plurality of connection section switches in Table 3.

This is the case when there is a branch line coming out of that section. In such a case, register only one section switch in Table 3 as the main line, and register the remaining section switches in a separate table (not shown) as the starting point section switches of the branch line. After detecting all the connection section switches in , the connection relationships of the branch lines can be traced in the same way. In this example, there are no branch lines connected to the main line. Next, a case will be described in which the amount of power demand in a section (a gathering point of consumers) is detected.

The daily power demand curve for each section (a curve that represents the change in power demand over 2 $f per day) is the corresponding section 2-11, 2-12, ..., 2-21, 2- 22,
・Varies depending on the details of the consumers connected to. FIG. 3 shows an example of the power demand curve for a section where the consumer is a residential area, and FIG. 4 shows an example of the power demand curve for a section where the consumer is a government office area. Based on the characteristics of each section, the standard power demand curve is
11, 2-12, . . . , 2-21, 2-22, and stored in the power system monitoring device 11 in advance.

Generally, the standard electricity demand curve consists of two types: one for weekdays and one for holidays.
There are different types. In addition, as mentioned above, the power system monitoring device 11 includes the Nishiya disconnectors 1-11, 1-21, . . . and the section switches 3-11, 3-12, . . . 3-21, 3-2.
The gathering point of distribution customers connected to 2, ・, that is, the section 2-11, 2-12, .
is memorized (Table 1, Table 2), and furthermore, the
1, 1-21, ... and section 2-11, 2-12, ...
. , 2-21, 2-22, .

In other words, normally, a call signal from the remote monitoring master station 6 is sent to the remote monitoring slave stations 5-11, 5-21 and the disconnectors 1-11, 1-2.
1,... and current transformers 4-11, 4-21,
Detects the distribution line current of ... and displays it on the system monitoring panel 7,
Furthermore, it is supplied to the power system monitoring device 11. In this state, the display command console 12 displays the power distribution shield disconnector 1-11.
, 1-21, . . . , the power system monitoring device 11 displays the disconnectors 1-11, 1-21, . . . as described above.
Sections 2-11, 2-12,... connected to...
Since 2-21, 2-22, ... are detected, each section 2-11, 2-12, ..., 2-21, 2-22, ...
The current hourly power demand can be easily estimated from the standard power demand curve for each section in FIGS. 3 and 4.

Now, to explain the power demand by expressing it in terms of current, section 2
-11, 2-12, 2-13, 2-1, the standard power demand at the current time is determined from the standard power demand curve for each section shown in Figures 3 and 4, and Il, i2, respectively.
, i3, j4 (A). On the other hand, the current current of the line disconnector 1-11 specified to be displayed is transmitted to the power system monitoring device 11 by the remote monitoring device master station 6, and the value is transmitted to the power system monitoring device 11.
A). The current 1 (A) flowing through the line disconnector 1-11 specified for display is
, 2-12, . . ., the reference current 11, i2, i3, i4
If you divide it proportionally into B, there will be no big error and the current current in each section will be 11~! can be detected. Distribution sheath breakers 1-11, 1-21, ..., section switches 3-11, 3-12, ... 3-21, 3-22 obtained in this way
,, section 2-11, 2-12,..., 2-21, 2-2
The current connection status of 2, .

Therefore, as described above, according to the present invention, the newly added power system monitoring device stores the reference power demand curve of each section, the disconnector, the section, and the interconnection relationship between the section opening and closing,
In addition, since the processing results of the power system monitoring device are displayed by specifying the display of power sources, disconnectors, etc. on the display control console, the current power demand for the section can be estimated with high accuracy.

In addition, conventionally, a current transformer was provided for each section, but with this device, it is sufficient to provide one at the starting end of the distribution line, reducing equipment costs. Furthermore, even if there are a large number of sections, they can be processed all at once, and power demand can be easily estimated without relying on human intuition.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional device, FIG. 2 is a block diagram showing an embodiment of the power system monitoring device according to the present invention, and FIGS.
The figure is a diagram showing an example of a daily standard power demand curve for a section where the consumer is a residential area and a section where the consumer is a government office area. 1-11, 1-21...Distribution cutter, 2-11,
2-12,...2-21,2-22,...section (consumer gathering point), 3-11,3-12,...,3-2
1, 3-22, ... section switch, 4-11, 4-21
,... Current transformer, 5-11, 5-21,... Remote monitoring device slave station, 6... Remote monitoring device master station, 7... System monitoring panel, 8-11, 8-12 ,...,8-21,8-22
,... Remote monitoring and control device slave station, 9... Remote monitoring and control device master station, 11... Power system monitoring device, 12... Display command console.

Claims (1)

[Claims] 1. In a device for monitoring the current demand of each section in a distribution system having a distribution sheath switch, multiple sections (gathering points of electricity consumers), and multiple section switches for each distribution line, A power system monitoring device that stores in advance the sections corresponding to the distribution sheath breakers, connection states of the section switches, and reference power demand curves for each section; It has a display command that displays the processing contents of the power system monitoring device, and a current transformer that detects the total current of the distribution line for each of the distribution lines, and displays the distribution sheath breaker on the display command console. At the specified time, the power system monitoring device receives the open/close status signals of the distribution line breakers and section switches transmitted from the remote monitoring system that monitors the status of the distribution line, and selects a display designation from among those stored in advance. After searching for the sections and section switches connected to the distribution switch or disconnector that has been searched, the current of the current transformer transmitted from the remote monitoring system is transmitted to each searched section. The current power demand of each section is estimated by proportionally distributing it according to the standard power demand, and the estimated power demand and the sections and section switches connected to the distribution shield and disconnector are displayed. A power system monitoring device characterized by displaying information on a command console.