JPH04183236A - Supervisory remote controller - Google Patents

Abstract

PURPOSE:To realize synchronized collection of power system data registered with time between a large number of slave stations by transmitting a control signal to a local station or other slave station when the local slave station detects a variation of predetermined binary information or numeric information. CONSTITUTION:A computer 1 is connected with master stations 11, 21 each of which is further connected through transmission lines 120, 220, respectively, with slave stations 101, 201. The slave stations 101, 201 measure 105, 105' ON/ OFF state of CB, current values on a transmission line, and the like. When a variation of the predetermined amounts 105, 105' to be measured is detected, a variation detection signal is delivered from a state variation detection designating table through transmitters 108, 109 to another slave station. Subsequently, the slave station transfers data, stored in a memory, to the master stations 11, 12 and the computer 1 rearranges thus transferred data in the order of time and analyzes variation of numeric data at each time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a remote monitoring and control device, and particularly to a remote monitoring and control device that collects various process data from a remote station into a master station.

(Prior art) In conventional remote monitoring and control equipment that measures process data such as the open/close status of power system circuit breakers and the current and voltage of power transmission lines, remote monitoring and control equipment slave stations (hereinafter referred to as slave stations) perform measurements. The obtained value was transferred to the remote monitoring and control device master station (hereinafter referred to as the master station) at regular intervals.

In addition, the slave station is equipped with a clock device and memory for storing measured values.
Continuous changes in switches such as circuit breakers are stored together with time and transmitted to the master station using control signals from the master station.
By rearranging the time-stamped data from multiple slave stations in chronological order using a computer controlling the master station, changes in circuit breakers, etc. in the entire power system being monitored can be grasped, which is useful for analysis in the event of an accident. Ta. However, for numerical information, data must be collected in synchronization with changes in binary information.
There was no time stamp on the collection.

(Problem to be Solved by the Invention) In the above-mentioned power system monitoring method, conventionally, the time data is mainly binary information such as circuit breakers, disconnectors, and protective relays, and the numerical information such as current and voltage is Because the electric power system is constantly changing, the method of saving data every time it changes would require a huge amount of storage memory, making it impractical to save it as timed data. Although it is possible to save the numerical information measured by a slave station when there is a change in the breaker at one slave station, the power system is wide-ranging, and it is difficult to store information using many slave stations. must be collected. When data is saved in one slave station, it must be saved in other slave stations at the same time, but since there was no way to instruct other slave stations to save data at the same time, it was necessary to save the data at an effective time. Could not collect.

However, when analyzing power system accidents, two
Analyzing not only the order of changes in value information, but also minute-to-moment changes in voltage and current (for example, with a resolution of several m5ec) has become essential for the increasingly complex accident analysis of electric power systems.

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a remote monitoring and control device capable of synchronizing and collecting power system data with time among a large number of slave stations.

[Structure of the Invention] (Means for Solving the Problems) In the present invention, when a slave station detects a change in binary information specified in advance or a change in numerical information exceeding a specified value range, the slave station, of course, When a control signal is transmitted to other slave stations via a wireless transmitter and the other slave stations do not receive the control signal, the control means sends a control signal to the measuring device, thereby transmitting a control signal to a large number of slave stations. It was configured to enable data collection to be synchronized between the two.

(Function) When the change detection means detects a change in binary information or numerical information, it notifies the control means and the signal transmission means accordingly. The control means operates at a predetermined period (for example, 1111 seconds,
) controls the measuring means that measures binary information and numerical information and stores it in the memory along with the time, so that the data is not updated after the measured data is stored a certain number of times after receiving the change signal. As a result, both the data before receiving the change signal and the data after receiving the change signal can be saved. The signal transmitting means transmits a change signal to other stations via a wireless transmitter. The receiving means of the other slave stations receive the signal and notify the control means accordingly.

After that, when receiving a data collection signal from the computer via the remote monitoring and control device WH station, each remote monitoring and control device slave station transfers the data stored in its memory to the master station, and the computer sorts it in chronological order. At the same time, we analyze changes in numerical information at each time.

(Example) Examples will be described below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of a remote monitoring and control device according to the present invention.

In FIG. 1, 1 is an electronic computer, and master stations 11 and 2
1 is connected, and each master station is connected to each slave station 101 and 2'01 via transmission lines 120 and 220. In each slave station 101 and 201, the measured quantity is 105°10
5', for example, the important state of the CB, the current value of the power transmission line, etc. are measured and transferred to the computer 1 via the master station 11.21.

FIG. 2 is a detailed configuration diagram of the slave station.

In FIG. 2(a), 104. . . . 104' is a measurement unit and the quantity to be measured 105. ... 105', the time from the clock 110, and the transmission buffer 112 and storage area 111. ...Stored in 111'. Reference numeral 114 denotes a state change detection specification table, in which prespecified measured quantities 105. ... 105', it sends out a change detection signal to other slave stations via the transmitter 108 and transmitter 109. 107 is a receiver, and 106 is a receiving section, which receives change detection signals from other slave stations and transmits them to the control section 103.

FIG. 2(b) is a configuration diagram of the state change detection designation table 114, where there is a detection designation corresponding to each measuring instrument, and when the corresponding measuring instrument is designated for detection, r□.

→ rlj, and if not, set it as “1” → “0”. The range of change in the value is set specifically, and when the change exceeds this set value, it is determined that the state has changed.

FIG. 3(a) is an example of the installation of slave stations and master stations in the power system under consideration.

In Fig. 3(a), it is assumed that the electric power system and the electronic computer Ill that monitors and controls it, the master station 11.21, and the slave stations 101 and 201 are installed. 51, shows substation 61.62, control center 5
A computer 1 and an M station 11.21 are installed at the substation 61.62, and slave stations 101 and 102 are installed at the substation 61.62.

The slave station measures the cut-off state of the breaker and the current 1, i of the transmission line 71.72, and the master station 11.21 and the slave station 10
1 and 201 are connected by transmission @120 and 220. For convenience of explanation, in slave station 101, breaker C80
10 and the power transmission line 71, and the slave station 20
1. Je? Current iB of disconnector CBO20 and transmission line 72
Assume that we are measuring . Now, if there is a temporary short circuit accident on power transmission line 71, the circuit breaker CBO10 at both ends
and CBO20 are cut off, and CBOl is shut off by the re-closing device.
o and CBO20 are reinserted. At this time, the power transmission line 71
．． The current iA of 72 and 18 change as shown in the graph of FIG. 3 [b).

The function of monitoring this accident using the present invention will be described.

First, the overall processing flow will be explained with reference to FIG.

In step 401, the slave station stores data and time in a storage area at regular intervals until it detects a change in itself or receives a change detection signal from another station, and also stores the data in the transmitter sofa. do. In step 402, it is determined whether a change has been detected or a change detection signal has been received, and the process in step 401 is performed until a change has been detected. When a change is detected in step 402, the process moves to step 403, and the data and time are stored in the storage area a fixed number of times. The process is then repeated until a data collection signal is sent from the computer via the master station. In step 404, upon reception of the data collection signal, the data and time in the storage area are transferred to the master station.

FIG. 5 is a flowchart showing the processing contents of the slave station.

The control unit is activated by the power source and begins operation.

First, the storage address of the data storage area is initialized, data 105 is taken in by the measurement unit, and time is taken in by the clock 110, and these are stored in the transmission buffer 112 (step 501). Next, retrieve the previous data from the send buffer (
(Since the data stored immediately before is included for the first time) (Step 502 >, then data 1 is sent from the measurement unit 104.
05, the time is read from the clock 110, and stored in the storage area 111 and also in the transmission buffer 112 (step 503). The storage area 111 is used cyclically in sequence, and when the final address is reached, data and time are overwritten and stored again from the beginning.

The transmission buffer 112 transfers the data in the transmission buffer to the master station 11 when the transmission section 102 receives a command from the master station 11 . Therefore, regardless of whether the data is saved or not, the latest data is transferred to the master station.

Next, change detection data specified in advance is extracted from the change detection specification table 114 (step 504).

The change detection specification table 114, as shown in FIG. The range of change shall be specified.

(For example, if numerical information is being measured at O~5■, a change is detected when 0.5V is specified, 4.0 V-4, 5V4:) The previous value extracted in step 502 The value is compared with the current value measured in step 503, and if there is a change specified in the change detection table, it is determined that there is a change, and the change detection is stored (
Steps 505, 506). If there is no change, step 506 is not performed, and the address for storing the next data and time is updated (step 507). At this time, as described above, the storage area is used in order from the beginning, and when it reaches the final address, it returns to the beginning and is used cyclically.

Next, it is determined whether a change signal from the own station has been detected or a change signal from another station has been received (step 508). No(
If neither is detected, the process is delayed for the necessary time (for example, 51 seconds) (step 509),
Return to step 502. The above processes are repeated until a change in the own station is detected or a change signal from another station is received.

The processing to be performed when a change signal from another station is not received or a change is detected by the station itself in step 508 will be described below.

First, let counter n=o. This is because: In order to save the data and time before and after the accident, first, the data and time before the accident are stored cyclically in a storage area in advance. Saving data and time after an accident shall be realized by saving data and time a specified number of times after receiving or detecting a change signal. For example, n
= 4000 times, delay of data and time reading
If it is 5ns per time, it will take 51 seconds from accident (change) detection.
1SeC.

Data can be stored 4000 times at intervals of 20 SeC.

For example, if a total of 10,000 pieces of data can be saved, 6,000 times (51 seconds, 30 seconds at intervals) before changing
, data can be saved 4000 times (50n+sec, at intervals of 20 seconds) after changes. Of course, the total number of cases and the value of n can be set arbitrarily in advance. In step 511, it is determined whether the change has been detected by itself (its own station), and if detected, a change detection signal is transmitted to other stations in step 512, and if not detected, the process moves to step 513. Next, data 105 and time are read from the measurement unit 104 and clock 110, and stored in the storage area and transmission buffer (step 513'), and the data storage address is updated (step 514, which is the same as 507).
.

In step 515, it is checked whether the process has been completed n times, and if it is completed, the process goes to step 517; if it is not completed, n=n+1 is set, and in step 516 (x n5ec, delayed), and the process returns to step 513. When completed n times, step 517
Then, the data 105 and time are read from the measurement unit 104 and the clock 110 and stored in the transmission buffer 112. This is a process for transmitting current online data until the computer 1 sends a data read signal via the master station 11 and the data and time in the storage area 111 are read. When the master station transmission is completed, the process from step 502 is repeated. If incomplete, XlFeIC, delayed (
Step 519) Return to step 517 and repeat steps 517, 518 and 519 until completion.

The following explanation will be given assuming that the measurement period in the slave station is 511 SeC.

First, the control unit 103 of the slave station 101 measures CBOlo and IA at intervals of 51s13c, stores them in a storage area with a time stamp, and stores the data in a transmission buffer.The data is sent to the master station via a transmission unit, for example. It is transmitted every 3 seconds (steps 502 to 509 are repeated). Child station 2
The same applies to 01. Here, if an accident occurs, CBOl
o changes from the ON state to the OFF state and then returns to the ON state. It will take 10rasec from start to finish. The slave station 101 detects a change in CBOIO, transmits a change detection signal, and repeats capturing and storing data and time a certain number of times (
Steps 510-515).

(This number is 6,000 before the accident and 4,000 after.

) Thereafter, data is updated in the transmission buffer until a data collection signal is received from the computer 1.

The slave station 201 receives the change detection signal from the slave station 101,
Similarly, repeat the import and save of data and time a certain number of times7.
After that, the data is updated in the transmission buffer until the data collection signal arrives. As a result, 6000 times (30 seconds,
511 seconds, interval), 4000 times after the accident (20 seconds,
This means that data of 5 rmsec, interval) can be saved. Electronic calculation I11 is calculated based on a certain period of time after the accident (in this case, 20
After waiting for more than 10 seconds), each master station 11.21 sends out a data collection signal via the master station, and the slave stations transmit the data and time in the storage area via the master station. After that, the slave station performs steps 502 to 5.
09 is repeated until the next accident detection.

Regarding data collection, it is possible to collect data not only in the event of an accident when a change in the slave station is detected, but also in any time period at the same time based on instructions from a computer or other device. The effect at this time is that the transmission timing of the change detection signal is
It is the same as the embodiment of the present invention described above except that it is from an electronic computer or other device.

[Effects of invention As explained above, according to the present invention, the sophistication can be improved.

Since the power system has become increasingly complex, the system has been configured to collect simultaneous binary and numerical information over a wide range at the time of an accident with a resolution of several n+ seconds, making it possible to perform advanced incident analysis and monitoring control. This will greatly improve the reliability of power system operations.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of a remote monitoring and control device according to the present invention, Fig. 2 is a detailed block diagram of a slave station of the present invention, and Fig. 3 is an installation example diagram of a power system, a slave station, and a master station. , FIG. 4 is a flowchart showing the overall processing flow according to the present invention, and FIG. 5 is a processing flowchart of data measurement, data storage, and change detection of the slave station. 1...Electronic computer 11.21...Master station 10
1, 201...Slave station 102...Transmission unit 10
3...Control unit 104, 104'...
Measuring parts 105, 105'...Measurement target part

Claims (1)

[Claims] Remote monitoring in which the measuring instrument on the remote station side has a memory and the measured information is written to the memory along with the time, and the information and time stored in the memory of the measuring instrument are transferred to the master station side by a control signal from the master station side. A remote monitoring and control device characterized in that the control device transmits a change detection signal to another station when a change in measured data is detected.