JPH07250441A - Distribution line monitoring control system and control method - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the control time of multiple pole equipment by a collective control command of the substation master station in a distribution line monitoring and control system. [Structure] The switches distributed over the distribution line are equipped with a protection control device with a supervisory control function, and the return data from the protection control device to the master station is monitored by another protection control device specified by the master station. , Make the switch operate on its own. [Effect] A plurality of pole devices can be operated in conjunction with each other, and the control time can be shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distribution line distant monitoring control system, and more particularly to a distribution line distant monitoring control system suitable for a master station to grasp a state of a protection control device group.

[0002]

2. Description of the Related Art As a system for transmitting and receiving signals between a master station and a protection control device using a distribution line as a signal transmission line,
For example, the one described in Hitachi Review Vol.65, No. 6 “Development of information transmission system using distribution line” is known.

In the system using the distribution line as a signal transmission line, a configuration is adopted in which signals are transmitted and received between the master station and the protection control device group by the zero-phase carrier transmission system. For example, a polling method in which the master station and the protection control device communicate with each other in a one-to-one manner, or in order to shorten the time required for communication, the master station issues a constant state monitoring command to all protection control devices in place of the polling method, After issuing this state monitoring command, a simultaneous monitoring method has been attempted in which each protection control device sequentially responds in a designated order.

Further, in order to quickly distinguish a sound section from an accident section when an accident occurs on a distribution line, a section for automatic detection of a failure section as described in page 1264 of the Electrical Engineering Handbook published by the Institute of Electrical Engineers of Japan in February 1988. A switch is used. According to this, after all the division switches are opened due to an accident, the division switches are automatically re-closed at a preset time interval and installed at the distribution line outlet of the substation. When an accident is detected by the accident detection relay, the circuit breaker at the outlet of the distribution line is immediately opened, and the section that has been re-closed immediately before that is used to determine which section has the accident. is there. This method is called a time-delayed progressive charging method. The details of this method are shown in JP-A-5-39645 and JP-A-5-51611.

[0005]

Communication takes time in the polling method. In addition, in the simultaneous monitoring method, the state of each protection control device can be fully grasped because a constant monitoring command is issued to all protection control devices, but it takes too much response time to remove only the smallest accident section. , As a result, it cannot be removed.

Further, the time-progressive charging system has a problem that when a fault occurs and when a fault segment is detected, a sound segment is out of power twice. Further, since the divisional switches are sequentially turned on at preset time intervals, the power failure time becomes longer toward the end of the distribution line due to the accident, so there is the first problem that the power failure section cannot be minimized.

Further, when operating the power distribution system, it is sometimes desired to combine a large number of pole devices to operate them quickly. In particular, when performing work inside substations and work on poles, in order to minimize the blackout section, insert the normally open switches of the two distribution lines, put them in a loop state, and then open the other switches. By doing so, the system is switched without interruption. This point will be described with reference to FIG.

FIG. 6 shows a system configuration of a distribution line. The distribution line busbar 2 connected to the distribution transformer 1 has a plurality of distribution lines. In the distribution line 3, a pole breaker or a division switch CB1 to divide the distribution line via a breaker FCB1
CB4 is arranged. On the other hand, on the distribution line 3 ', a pole breaker or division switches CB1' to CB4 'for dividing the distribution line via a breaker FCB1' is arranged.
Further, the distribution line 3 and the distribution line 3'are connected to each other through the normally open switch CB100 which is always open. The section switches CB1 to CB4, CB1 'to CB4', and the normally open switch CB100 incorporate various sensors for extracting the amount of electricity of the distribution lines 3 and 3 '. In addition, the division switches CB1 to CB
4, CB1 'to CB4' and the normally open switch CB100 are provided with protection control devices RY1 to RY4, RY1 'having a protective function to monitor and control or to detect a distribution line accident.
~ RY4 'and RY100 are attached to the respective section switches CB1 to CB4, CB1' to CB4 'and the normally open switch CB100.

Between the computer system 4 and the substation master station 5, and between the substation master station 5 and each protection control device RY1 to RY4, RY1 '.
RY4 'and RY100 are interconnected by a communication line 6. The network configuration of the communication line 6 is various, such as a loop type and a bus type, and is further duplicated.
Y4, RY1 'to RY4' and RY100 are transmitted.

With this construction, when the pole switch work of the division switch CB1 is carried out or the construction within the power distribution section surrounded by the division switch CB1 and the division switch CB2 is carried out, the division switch
Cut off CB1. Therefore, the power distribution section surrounded by the partition switch CB1 and the partition switch CB2 and the power distribution section surrounded by the partition switch CB2 and the normally open switch CB100 will be out of power.

Therefore, in order to minimize the power failure section, the normally open switch CB100 is first turned on to form a loop state, and thereafter, the partition switches CB1 and CB2 are shut off, so that the partition switch CB2 and the normal switch CB2 are normally connected. The power distribution section surrounded by the open / close switch CB100 can avoid a power failure.

However, when the distribution line loop is formed, an excessive loop current may flow due to the potential difference and the phase difference, and the substation protection Ry may operate. Therefore, the loop formation time is shortened or the substation protection Ry is generated. It is necessary to take measures such as locking the. This is the second problem.

To solve the first problem, it is an object of the present invention to provide a distribution line distant monitoring control method capable of grasping the state of the protection control device of not only the own system but also the other system.

To solve the second problem, it is possible to shorten the loop time, to complete the loop switching operation before the substation protection Ry operates, and to operate a plurality of pole devices. It is intended to provide a distribution line monitoring and control system having a function of collectively controlling pole equipment that can reduce the control time.

[0015]

[Problems to be Solved by the Invention] A plurality of section switches distributed in a distribution line and a protection control device having an accident detection relay corresponding to the section switches are provided, and the protection control device connects a communication line. A distribution line monitoring control system that communicates with a substation master station through, the protection control device starts a time measurement by the accident relay, and provides a timer that outputs a trip command of the classification switch after a predetermined time, A protection control device that reports accident information as reply data from the protection control device in advance and a protection control device that monitors the reply data are set, and the protection control device set to monitor in advance is the reply data. In response to the accident information inside, the timer of the timer was stopped.

Further, a plurality of division switches arranged in a distributed manner on the distribution line and a protection control device having an accident detection relay corresponding to the division switches are provided, and the protection control device is connected to the substation through a communication line. A distribution line monitoring control system for communicating with a master station, wherein a transmission command for setting a protection control device that reports processing information of its own division switch as reply data, and a protection control device that monitors the reply data is provided. The protection control device, which is output from the substation master station and monitors the reply data in response to the reply data, operates its own division switch.

[0017]

The substation master station specifies that the return data of a specific protection control device is to be monitored by another protection control device. Each protection control device activates a timer when an accident occurs, and outputs a trip command to the switch after a certain period of time. On the other hand, when the reply data contains distribution line accident information, the protection processing device designated as a monitor resets its own timer so that the trip command is not output. If there is no accident information, the timer continues to count up, and the accident section is separated by tripping only the switch on the accident section side.

Further, the substation master station specifies that the processing information of the division switch corresponding to the specific protection control device is to be monitored by another protection control device as return data. Then, when the processing information of the division switch targeted by the protection control device designated by the monitor and the return data match, the protection control device designated by the monitor operates its own division switch.

When the information from the section switch thus monitored is output as reply data, the protection control device that is monitoring immediately turns on and off its switch to shorten the processing time. be able to.

[0020]

EXAMPLES The present invention will be described based on examples. Figure 2
[Fig. 6] is a configuration diagram of a pole device including a partition switch CB1 and a protection control device RY1 thereof. Other classification switches CB2-C
B4, CB1 'to CB4', and normally open switch CB100
And protection control devices RY2 to RY4 and RY1 'to RY
4'and RY100 have the same structure.

The sectional switch CB1 comprises a circuit breaker 7, a sensor 8 for taking in an accident or an electric quantity, and a drive unit 9 for driving the circuit breaker 7. Further, the protection control device RY1 includes an accident detection unit 10 that detects electric power information of the distribution line 3 and an accident from an output signal of the sensor 8, a logic unit 11, and a communication unit 12 that is connected to the communication line 6.

In FIG. 3, the substation master station 5 has a protection control device RY.
2 is an example of performing data communication with 2. In the invention of the present application, the network configuration of the communication line 6 may be such that the reply data of the specific protection control device can be monitored by another protection control device.

Reference numeral 13 denotes a data structure of transmission data transmitted from the substation master station 5, which is adapted to communicate the selected communication partner with the monitored partner. Upon receiving this data, the protection control device RY2 of the communication partner returns the accident information, the open / closed state, the measurement value information and the like to the substation master station 5. In addition, the protection control device RY1, which is one of the monitoring partners,
The reply data 14 is monitored, and the classification switch CB1 (the own circuit breaker) is opened or closed based on the result.

That is, the substation master station 5 is the specific protection control device R.
When collecting the information of Y2, the other protection control device RY1 is designated so as to monitor the information of the protection control device RY2. If the transmission data of the substation master station 5 is set to 15, the protection control devices RY1 and RY3 can monitor the reply data 14 of the protection control device RY2.

FIG. 4 is a flowchart of the main processing of the protection control device RY1, and the other protection control devices are the same. The protection control device RY1 detected by the sensor 8 of the division switch CB1 has a timer (not shown) provided in the logic unit 11.
Is driven, and when the time is up, a command to trip the classification switch CB1 is output.

As shown in FIG. 5, the monitoring process flow of FIG. 4 is a process of resetting the timer when reply data with an accident is transmitted from another protection control device RY monitored by the protection control device RY1. I do.

FIG. 1 is a diagram showing a reply method when an accident occurs in the distribution line 3. The protection control device to be monitored by the substation master station 5 is the protection control on the distribution transformer 1 (power supply) side. The device.

Accident state 1 in which a short circuit accident occurs at accident point F
000, the protection control device R on the power supply side of the accident point F
An accident is detected in Y1 to RY3, and the timer will trip the sectional switches CB1 to CB3 after a certain period of time.

At this time, each protection control device RY1 to RY4
Examines the monitor information obtained by the command of the substation master station 5,
If there is an accident, the timer is reset, if there is no accident, the timer counts up and continues, and by interrupting the system with each circuit breaker, it is possible to reduce the power failure section.

Specifically, first, the substation master station 5 instructs the protection control device RY1 to transmit the accident status.

(1) The protection control device RY1 is the substation master station 5
Is received, and the accident information is transmitted (step 17).

(2) The substation master station 5 is the protection control device RY2.
In addition to instructing to transmit the accident information, the protection control device RY1 is instructed to monitor the reply data of the protection control device RY2 (step 18).

(3) When the reply data of the protection control device RY2 indicates an accident, the protection control device RY1 which has been monitored resets its own timer (step 19).

(4) When the reply data of the protection control device RY3 has an accident, the protection control device RY2 resets 21 its own timer (step 21).

(5) Since the protection control device RY4 has not detected an accident, the protection control device RY3 continues counting up the timer based on the transmission data (step 23).

By setting such a sequence, only the power supply side protection control RY3 closest to the accident point is timed up, and the division switch CB3 is tripped before FCB1 (the protection control is performed in advance from the FCB operation time limit). Since the timer of the device is settled small), the power failure section can be minimized.

In addition, if the substation master station 5 is constructed so as to constantly monitor the steps 17 to 23 repeatedly and repeatedly, the accident section is identified by the information obtained by this, and the substation master station 5 (or, By outputting a control command from the computer system 4) to the protection control device RY, the system can be combined with a system for reducing the size of the stop electrode and can be a system backup.

As another embodiment, the protection control device RY monitored by the substation master station 5 is not designated by every communication, but the protection control device RY is provided with a non-volatile memory or the like in advance to perform a specific protection. Similar monitoring control can be performed by downloading the information about the control device RY.

Next, an embodiment of the present invention for the second problem will be described. In FIG. 7, the substation master station 5 is the protection control device RY.
2 shows an example of performing data communication with 2. The data 24 is the data structure of the transmission data transmitted from the substation master station 5, and the protection control device RY2 that received this data performs monitoring control according to the content of a predetermined control code, and displays the result. Reply to the substation master station 5. On the other hand, the protection control device RY1
Monitors the reply data 25. That is, when the substation master station 5 collects information on the specific protection control device RY2,
A command is given to another protection control device (in the example, the protection control device RY1) to monitor the information of the protection control device RY2.

If the transmission data from the substation master station 5 is set as data 26, the protection control device RY1 and the protection control device RY3 can monitor the reply data 27 of the protection control device RY2.

FIG. 8 is a flow chart of the main processing of the protection control device RY1, and the other protection control devices are the same. The protection control device RY1 selected by the substation master station 5 controls the switch with the drive unit 8 from the logic unit 9 according to the control code content of the substation master station 5, and returns the execution result. Further, FIG. 9 is a flowchart of the monitoring process in FIG. 8, and when the protection control device RY1 is designated to monitor the reply data of another protection control device, the protection control device R
When the monitor information of Y2 satisfies the command of the substation master station 5, the control of the switch of the protection control device RY1 is executed,
The control result is transmitted.

Referring to FIG. 10, the system is achieved by moving the normally open point switch from the partition switch CB3 to the partition switch CB2 for the two systems separated using the partition switch CB3 as the normally open point switch. The case of switching is shown. As the system switching operation, after the division switch CB3 is turned on (loop state), the division switch CB2 is opened.

With respect to the protection control device RY2 and the protection control device RY3 selected in advance by the command of the substation master station 5, in step 28 of the substation master station 5, the protection control device RY3 turns on the partition switch CB3, and Control result protection controller R
Instruct Y2 to monitor. When the classification switch CB3 is closed successfully, the reply data 29 of the protection control device RY3 is in the closed state, so the protection control device RY2 opens the classification switch CB2 and returns the result to the main station 5 of the main station. .

In the embodiment, the case where the normally open switch is handled by another partition switch has been described as an example. However, when the partition switch is responsible for other processing operations, the same processing can be performed. It is self-evident that it can be easily achieved.

[0045]

As described above, with respect to the first problem, the substation master station 5 instructs another protection control device to monitor the reply data of the specific protection control device, thereby causing an accident section. Since the accident section can be separated by the switch on the power supply side, the blackout section can be minimized.

For the second problem, the substation master station 5
Specified protection control device (normal open point)
As the return data, the protection control device specified by the substation master station monitors the return data, and if the result is good, it controls to open the relevant switch, thereby making a loop for system switching. The time can be shortened.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of the present invention for determining a minimum power failure section.

FIG. 2 is a diagram showing a circuit breaker and a protection control device of the present invention.

FIG. 3 is an example of a transmission / reception data structure in the present invention.

FIG. 4 is a main processing flowchart of the protection control device of the present invention.

FIG. 5 is a monitor processing flowchart of the protection control device of the present invention.

FIG. 6 is a distribution system diagram used in a conventional example.

FIG. 7 is an example of a transmission / reception data configuration at the time of system switching in the present invention.

FIG. 8 is a main processing flowchart of the protection control device of the present invention.

FIG. 9 is a monitoring process flowchart of the protection control device of the present invention.

FIG. 10 is a diagram showing the overall operation at the time of system switching according to the present invention.

[Explanation of symbols]

1 ... Distribution transformer, 2 ... Bus bar, 3 ... Distribution line, 5 ... Substation master station, 6 ... Communication line, CB1, CB2, CB3, CB4
CB1 ', CB2', CB3 ', CB4' ... Sectional switch, RY1, RY2, RY3, RY4, RY1 ', RY
2 ', RY3', RY4 '... Protection control device.

Claims (6)

[Claims] 1. A protection control device having a plurality of division switches distributed in a distribution line and an accident detection relay corresponding to the division switches, wherein the protection control device is connected to a substation through a communication line. A distribution line monitoring control system for communicating with a master station, wherein the substation master station sets a protection control device for reporting accident information as reply data and a protection control device for monitoring the reply data. Distribution line monitoring and control system. 2. The protection control device for monitoring the reply data according to claim 1, wherein the protection control device is provided with a timer for starting time measurement by the accident relay and outputting a trip command of the classification switch after a predetermined time, A distribution line monitoring and control system characterized by stopping the time measurement of the timer in response to accident information in reply data. 3. A plurality of division switches distributed in a distribution line and a protection control device having an accident detection relay corresponding to the division switches are provided, and the protection control device is provided through a communication line to a substation. A distribution line monitoring control system for communicating with a master station, wherein the protection control device starts a time measurement by the accident relay and provides a timer for outputting a trip command of the classification switch after a predetermined time, and the protection control is performed in advance. A protection control device that reports accident information as reply data from the device and a protection control device that monitors the reply data are set, and the protection control device set to monitor in advance is the accident information in the reply data. A distribution line monitoring and controlling system characterized by stopping the time measurement of its own timer in response to the above. 4. A plurality of division switches distributed in a distribution line and a protection control device having an accident detection relay corresponding to the division switches are provided, and the protection control device is connected to a substation through a communication line. A distribution line monitoring control system for communicating with a master station, wherein a transmission command for setting a protection control device that reports processing information of its own division switch as reply data, and a protection control device that monitors the reply data is provided. A power distribution monitoring and control system, wherein a protection control device that is output from a substation master station and monitors the reply data in response to the reply data operates its own section switch. 5. A plurality of distribution lines in which a plurality of divisional switches are arranged in a distributed manner are provided to connect to a substation transformer, and the distribution lines are connected via a normally open switch and correspond to the divisional switches. By providing a protection control device having an accident detection relay, the protection control device is a distribution line monitoring control system that communicates with the substation master station via a communication line, and the processing information of the normally open switch is returned as return data. The substation master station sets a first protection control device that reports as above and a second protection control device that monitors the reply data, and the second protection control device responds to the reply data and the second protection control device. A distribution monitoring and control system characterized by operating a division switch of a protection control device. 6. A control method for a distribution line monitoring control system, which communicates with a substation master station via a communication line and a protection control device having an accident detection relay corresponding to a plurality of section switches distributed and arranged on a distribution line. A first method of operating a time measuring counter provided in each protection control device by detecting an accident of the accident detection relay and outputting a trip command of the classification switch after a predetermined time,
A second method of monitoring communication between the substation master station and another protection control device and stopping counting of the time measurement in response to accident information in the communication information, and the protection control device to monitor Is a control method for the distribution line monitoring and control system, which is either designated in advance or designated from the substation master station.