JP2814793B2 - Remote monitoring and control system for distribution line protection equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention performs protection control of distribution lines.
In connection with the remote monitoring and control system of distribution line protection equipment,
Distribution line protection device that minimizes accident point charging due to control operation
Distant monitoring and control system.

[0002]

2. Description of the Related Art Conventionally, a remote monitoring and control system for a distribution line has mainly been used to monitor and control the state of segmented switches distributed in the distribution line. An overview of the distribution automation system, as well as signal transmission paths and signaling methods are described.

[0003] In addition, due to social needs accompanying the development of the highly information-oriented society, a distribution line protection system for uninterrupted distribution lines or for reducing the range and duration of power interruption has been developed together with the above-mentioned automatic distribution system. (JA)
TEC Nippon Techno-Economic Center publication "The latest comprehensive technical data collection of distribution automation system").

[0004] The issues to be developed for the electrode downsizing system are the technology for detecting the accident section and the uninterrupted operation of the healthy section. However, it is essential to quickly disconnect the accident section, and it is independent of the operation status of the automatic distribution system. Then, the accident section separation control is preferentially performed.

Therefore, when a remote switch located in an accident section is remote-controlled by the remote monitoring and control system, a protection device (accident detection relay) provided in the temporary switch is activated to immediately open the switch. . At this time, the master station of the remote monitoring and control system cannot recognize that the sectional switch has been changed from “off → on → off”, and receives a “switch off state” as a reply to the ON command, or an accident has occurred. In order to obtain the communication result of "reply completion" from the slave station due to the system disturbance due to the above, a retry (transmission command is transmitted again) processing is performed. As a result, the switchgear is turned on again and opened by the operation of the fault detection relay. As long as the master station continues the retry process, charging to the fault point is repeated. There is a serious problem that the operation is not performed sufficiently and unnecessary stress is applied to the power distribution equipment due to repeated accidents.

[0006]

As described above, according to the present invention, when a sectional switch including an accident section is remotely closed from the master station of the remote monitoring control system, the closing of the sectional switch and the detection of the accident are performed. Repeated release by the relay operation eliminates the erroneous judgment that the master station of the remote monitoring control device is a slave station or a section switchgear device error, or the erroneous judgment of a communication error due to no response from the slave station, and a distribution line accident. It is an object of the present invention to provide a remote monitoring and control system for a distribution line protection device for the purpose of avoiding unnecessary stress on distribution equipment due to repetition of the above.

[0007]

In order to achieve the above object, a slave station of a remote monitoring and control system for a distribution line protection device according to the present invention, when performing a switching operation of a segment switch, performs a segment opening and closing operation.
Immediately after the switch is closed, the accident detection relay operates to open the sectional switch.
If it is installed, the slave station with
It is designed to lock the input operation by
You.

Further, in order to achieve the above object, the present invention
Remote monitoring and control system of distribution line protection device
Reply from slave station when selecting, controlling, or deselecting
Whether there is "trip by accident detection relay" in the information
, The master station of the remote monitoring and control system is divided
It is possible to determine the presence or absence of the operation of the accident detection relay provided in the switch.
And avoid unnecessary accident point recharging.
You.

[0009]

The remote monitoring and control system of the distribution line protection device according to the present invention.
According to the system, at the time of remote control of the accident section switch, the slave station receives the "insert command" from the master station again by locking the closing switch for a certain period of time by opening the section switch immediately after the closing operation. and even, to interlock the re-charging of the accident point
To prevent re-charging of accident points and repetition of distribution line accidents
It becomes possible to do.

Note that the purpose can be achieved by releasing the locking lock for a certain period of time upon receiving "deselection" or upon receiving "selection".

Further , the remote monitoring of the distribution line protection device of the present invention.
According to the control system, the master station side receives the reply information from the slave station.
Whether there is "trip by accident detection relay"
The master station stops retry processing by detecting
Therefore, recharging the accident point to prevent repeated distribution line accidents
It becomes possible to stop.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.

FIG. 1 shows a system configuration of a 6.6 kV distribution line according to an embodiment of the present invention. As shown, from the transformer 1 of the substation via the distribution bus 2 of 6.6 kV,
A plurality of distribution lines 3 and 4 are configured, and an outlet circuit breaker FCB is provided at a substation lead-out point of the distribution line.

The distribution switches 3 are provided with divisional switches SW1 to SW3 as appropriate, and sections L1 to L3 are defined. A similar facility is configured in the distribution line 4, and the switch SW
4 allows the power to be interchanged as needed. Switch FCB of distribution line 3,
At the installation points of SW1 to SW3, sensors FS and S for detecting accidents
1 to 3 are provided, respectively, and a current transformer and a voltage transformer are provided as these sensors. Electricity of distribution line detected by the sensor (load currents IA, B, C
The line voltages VAB, BC, CA, the zero-phase current Io, the zero-phase voltage Vo, etc.) correspond to the corresponding fault detection relays FRY, RY1 to RY1 to RY3.
Has been entered. The fault detection relay appropriately addresses short-circuit fault detection (overcurrent relay, undervoltage relay, etc.) and ground fault detection (ground fault direction relay, zero-phase overvoltage relay, zero-phase overcurrent relay, etc.).

Further, in order to monitor and control the operation state of the distribution line 3 from a distance, a master station for issuing a monitoring control command to a business office or a substation, and slave stations 1 to 3 provided in each section switch, respectively, It has a communication structure that can monitor the status of the segmented switches and control the closing and tripping. This communication configuration may be a dedicated communication line or a power line carrier system using a distribution line as a signal path. In this embodiment, a description will be given of a zero-phase transmission system, which is one of the power line carrier systems.

Here, the principle of the zero-phase transmission system will be described with reference to FIG.

FIG. 2 is a diagram showing the configuration of the transmission and reception principle of the zero-phase transmission system. In the secondary side of the transformer 10 in the substation, (1) On the transmission side, one phase of the three-phase distribution line (A in this example) Phase) and a signal (1 or 0) for transmitting a small-capacity impedance 11 (capacitor in this example) between the ground and the switching device 12 at a timing synchronized with the system frequency in a balanced state. , Only the A phase of the ground capacitance 13 is slightly changed, and the A phase ground potential is changed.

(2) On the receiving side, the potential between the ground and each phase is taken out via the capacitor voltage divider 14 and combined with a vector to obtain a zero-phase voltage Vo. Since the zero-phase voltage Vo is always a value close to zero, a received signal can be extracted by changing the zero-phase voltage. Here, in order to improve the reliability, the zero phase voltage Vo is multiplied by the ground voltage of the A phase which is the signal injection phase. As a result, a signal consisting of a DC component and a second high-frequency component is obtained, and only the DC component is extracted by removing harmonic components from the signal to obtain a received signal.

The above is the principle of the zero-phase transmission system, and this principle enables bidirectionality from the master station to the slave station and from the slave station to the master station.

In the remote monitoring and control system for distribution lines constructed as described above, a function to lock the recharging of an accident point by remote control of a slave station is incorporated.

FIG. 3 is a flow chart of the processing at the time of the remote control operation of the slave station. Here, as the far-off operation, a two-action method of selection and control is generally used. Therefore, as shown in FIG. 3, the slave station does not accept the control command until it is "selected".
At the time of “selection”, the injection processing can be executed (input lock release).

The switch closing condition of the slave station is that the switch is being selected and that the closing lock is being released. When a closing command is received from a remote control, when the switch is closed, the time required for the operation of the fault detection relay is required. If the switch continues to be “ON”, the control is considered to be successful.If the switch becomes “OFF”, it is determined that the accident section has been charged by turning on the corresponding switch, and then “ON lock” State. The “closing lock” signal is
It is held until a selection command is received again, and re-closing of the switch by retry processing from the master station is interlocked.

In the communication system using the zero-phase transmission method, the master station detects an error bit in the reply information from the slave station or cannot receive the signal (from the slave station) due to abnormal zero-phase voltage or the like in a distribution line fault state. There is a case where it is determined that there is no reply). In this case, the command is retried (retransmitted). Therefore, by having the above-mentioned interlock in the slave station, recharging of the fault point is prevented, and at the time of retry, the master station sends a signal indicating "switch-off state disconnection" and "accident detection relay operation" from the slave station. It is also possible to receive.

In this embodiment, at the time of the first closing operation, the slave station determines the presence or absence of an accident trip by using the operation time of the accident detection relay. There is no.

In this embodiment, the near-end accident is assumed for the presence or absence of an accident trip. However, if consideration is also given to the detection of an accident by time-sequential transportation in the subsequent section, selection is canceled after the closing operation. By the time the accident detection relay is activated by the time the switch is tripped, the closing lock may be set.

The release lock is released until the selection is released or the selection is made again.
There is no problem even if it is automatically released after a certain time limit depending on the operation duty and performance of the equipment.

As an embodiment of the present invention, processing at the master station will be described.

FIG. 4 is a flow chart of the processing when the master station enters the remote control. When the master station outputs a turn-on command to the selected switchgear, the response data from the slave station is “switchgear off”.
Alternatively, if there is an error bit in the reply data from the slave station (communication error), or if a reply from the slave station cannot be received (no response), retry is not performed immediately, but a new selection is made. To start, the presence or absence of an accident detection relay is checked based on the information at the time of the selection, and when an accident is detected, the operator is notified by an alarm or the like and the processing is stopped.
If there is no accident, a retry is performed, so that there is no hindrance to a series of systematic operations.

With the above processing, recharging of the accident point can be prevented, early warning at the time of the accident can be generated, and erroneous judgment of unnecessary device abnormality, communication abnormality, etc. can be made in a series of operation results. You can avoid it.

Although the present embodiment has been described by starting over from the selection processing again, it is also possible to release the selection once and then leave it to the judgment of the operator.

[0031]

As described above, according to the present invention, when a sectional switch is turned on by remote control, the fault point is charged by turning on the switch and the fault detection relay opens the switch. In, to configure an interlock that does not perform the repetitive closing operation on the slave station side or the master station side,
By preventing the repeated occurrence of distribution line accidents,
It has a great effect of not exerting unnecessary stress on the power distribution equipment, can avoid erroneous judgment in managing information in the remote monitoring control system, and can notify the operator of the occurrence of an accident early. The effect that it becomes possible is also obtained.

[Brief description of the drawings]

FIG. 1 is an example of a system configuration of a distribution line to which the present invention is applied.

FIG. 2 is a configuration diagram of a transmission / reception principle of a zero-phase transmission system.

FIG. 3 is a processing flowchart at the time of a remote control operation of a slave station.

FIG. 4 is a processing flowchart at the time of a remote control operation of the master station.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-107418 (JP, A) JP-A-63-234824 (JP, A) JP-A-1-222637 (JP, A) 29496 (JP, B2) JP-B 64-12166 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02J 13/00 311 H02H 7/26

Claims (5)

(57) [Claims] Having a 1. A distributed arranged section switch distribution line
Monitor the status of that slave station, it had contact to the remote monitor control system of the distribution line protection device that performs a control function, an accident detection relay provided in the section switch, the operation of the accident detection relay, which opens the section switch to distribution line protection device having a time of performing the closing operation by the remote monitor control system, immediately after closing of the section switch, when the fault detection relay is opened the operation to the section switch is the Division open
A remote monitoring and control system for a distribution line protection device, characterized in that a slave station having a closing device locks a closing operation by a remote control for a predetermined time. 2. A remote monitoring control of the distribution line protection device according to claim 1.
And have your system receives closing command the slave station by distant control, when the fault detection relay immediately after turning on the section switch operates and opens the section switch is the child station by far the control until it is deselected or newly selected to the remote monitor control system of the distribution line protection device wherein the slave station is characterized in that for locking the closing operation due to distant control. 3. The remote monitoring and control of the distribution line protection device according to claim 1.
And have your system, the master station of the remote monitor control system, before
It sends a closing command to the serial slave station, when receiving the "section switch OFF state" reply finger Ordinance grasps the slave station state select one Dan deselected or again without determining the device abnormality A remote monitoring and control system for distribution line protection equipment. 4. The remote monitoring control of the distribution line protection device according to claim 1.
And have your system, the master station of the remote monitor control system, sends a closing command to the slave station, if not received a response to finger decree, not device abnormality or determines that the communication failure, one Dan selected A remote monitoring and control system for a distribution line protection device, characterized by releasing or selecting again and grasping the status of a slave station. 5. having a distributed arranged section switch distribution line
And have you to remote monitor control system of the distribution line protection devices monitor the status and control of that slave station, an accident detection relay provided in section switch, the operation of the accident detection relay, the function of opening the section switch against the distribution line protection device having, when selecting the section switch, when the control or in the reply information from the deselect time of the slave station, by incorporating the existence of "trip accidental detection relay" far this master station monitoring control system to enable determination of the operation whether the fault detection relay provided in the section switch, to avoid recharging unnecessary fault point
Remote monitor control system of the distribution line protection device characterized by and.