JP2002262449A - Fault section detecting apparatus for substation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fault section detecting device with which automatic section switches which are respectively locked for each distribution line group can be identified and grasped and duration of power failure condition can be minimized in respect of time and extent, when a fault like power blackout, power restoration or power failure occurs in the superior system of a substation. SOLUTION: The fault section detecting device 16 is disposed on each of a plurality of high voltage distribution lines 11 branched from the substation 100, and also a mimic switch 3 operated on a voltage stepped down from the primary voltage of a transformer of a superior power transmission system of the distribution lines 11. A fault section detecting device 12, which detects, for actuation, the close/open operation of the mimic disconnecting switch 3 as the start condition/stop condition for timing, is disposed at every substation 100.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substation which is installed in a substation and detects a fault section when a fault occurs in a plurality of distribution lines connected to a substation in a group. The present invention relates to a system fault section detection device. In detail, in order to improve the efficiency of distribution system operation, supply reliability, and improve service to power consumers, when a failure occurs in a distribution line, the failure section is detected, and
The present invention relates to a fault section detecting device for a substation system configured to automatically separate a fault section and start power transmission to a healthy section at an early stage.

[0002]

2. Description of the Related Art As a fault section detecting device for a substation system of this kind, a device having the following configuration has conventionally been generally employed. That is, as shown in FIG.
In the middle of a plurality of high-voltage distribution lines 11 branch-connected in groups to the transformer secondary side of 00, a plurality of, for example, seven automatic switches for division VS1 to VS7 and a time period that is a kind of time relay. The progressive control devices 13-1 to 13-7 and their power transformers 14-1 to 14-7 are installed, whereby each high-voltage distribution line 11 is connected to the first to eighth sections 11-1 to 11-8. It is divided into. In addition, a distribution circuit breaker 15 and a failure section detector 16 interlocked with each of the distribution circuit breakers 15 are installed at the side of the distribution substation 100 of each of the high-voltage distribution lines 11.

FIG. 6 is a block diagram showing the internal configuration of a faulty section detector 16 installed at the distribution substation 100 side of each of the above-mentioned high voltage distribution lines 11, and the opening and closing of a contact 15F of a distribution circuit breaker 15 is shown. That is, the detection circuit 17 for detecting ON / OFF, and the clock of the crystal oscillator 19 in synchronization with the sequential input of the automatic switches VS1 to VS7 on the high-voltage distribution line 11 side accompanying the ON detection operation of the detection circuit 17 A stepping circuit 18 that counts and steps according to a signal, a section display circuit 20 that displays sections 11-1 to 11-8 corresponding to the number of steps, a display 21 directly connected thereto, Stop detecting circuit 2 for detecting that the step has stopped due to occurrence of
2, an output circuit 23 for generating an output voltage corresponding to a step number in the step circuit 18, that is, an output voltage in accordance with a section being displayed, a power circuit 24 for driving them, and a power circuit for driving the crystal oscillator 19 and the like. 25 and a reset circuit 26.
The section display circuit 20 and the display 21 provided in the fault section detector 16 itself may not be provided.

A control station 200 set at a remote position distant from the distribution substation 100 receives a step stop signal detected and transmitted by the step stop detecting circuit 21, that is, a failure display signal. A failure alarm 2 that activates and reports a failure
7 and the first to eighth sections 1 to 8 of the high-voltage distribution line 11 by converting the output voltage transmitted from the output circuit 23 into a digital signal.
The fault occurrence section of 1-1 to 11-8 is set to each of these sections 11
And a section display 28 for displaying numerical values “1 to 8” preset according to −1 to 11−8. The display return (reset) of the failure section detector 16 is performed by a return push button (not shown) provided on the main body of the detector 16 or a return push button (not shown) provided on the control center 200 side. ) To operate the reset circuit 26 to operate the reset circuit 26.

Next, an outline of the operation of a conventional fault section detecting device for distribution lines having the above basic configuration will be described. In the following description, in order to make the operation easy to understand, two out of a plurality of high-voltage distribution lines 11 branch-connected in groups to the transformer secondary side of the distribution substation 100 are described. As shown in FIG. 7, the high-voltage distribution lines 11 are given branch symbols A and B, and the two high-voltage distribution lines 11A, 1
Although the operation will be described with reference to 1B, the operation of other high-voltage distribution lines in the group unit is exactly the same. Further, the fault section detector 16A, which is linked to the two distribution circuit breakers 15A, 15B,
Since the internal configurations of 16B are exactly the same, they are represented by the same reference numerals.

(1) When there is no failure in the two high-voltage distribution lines 11A and 11B: In this case, as shown in the time chart of FIG. 8, the distribution circuit breakers 15A and 15B corresponding to the high-voltage distribution lines 11A and 11B are used. 15B is turned on and the contact 15F is
N, the faulty section detectors 16A and 16B are activated, and the automatic switches V for segmenting the high voltage distribution lines 11A and 11B.
SA1 to VSA7 and VSB1 to VSB7 are sequentially supplied at a set time t of, for example, about 7 seconds. In synchronization with the sequential turning on of the automatic switches for segmentation VSA1 to VSA7, the stepping circuits 18 in the faulty section detectors 16A and 16B are 1, 2, 2
3. If there is no failure in all of the first to eighth sections 11-1 to 11-8, the sections 11-1 to 11-8 corresponding to the number of steps are performed.
Are sequentially displayed on the display 21 via the section display circuit 20,
After the section display up to the eighth section 11-8 is completed, the apparatus automatically returns to the standby state.

(2) Fifth section 11A of high-voltage distribution line 11A
-5: In this case, as shown in the time chart of FIG. 9, the protection device (not shown) of the distribution substation 100 operates and the distribution circuit breaker 15A corresponding to the high-voltage distribution line 11A. Is cut off, and after a certain period of time from the time of the cutoff until the automatic sorting switches VSA1 to VSA7 are opened without voltage, the distribution circuit breaker 15A is reclosed and its contact 15
When F is turned ON again, the fault section detector 16A is started in the same manner as in (1). In this state, the high-voltage distribution line 11
The automatic switching switches VSA1 to VSA7 for the sorting of A are set at the time t.
And the step-up circuit 18 in the faulty section detector 16A also steps up in synchronization with the
The charging proceeds from 1-1 to 11-4, but the fifth
When the charging proceeds to the section 11-5, the power distribution circuit breaker 15A is cut off again and its contact 15F is turned off, so that the stepping circuit 18 stops moving, and the fifth circuit having the fault point is stopped.
The automatic switching switch VS4 on the power supply side of the section 11-5 is locked in the open state, and the display 22 displays the fifth section 1
1-5 remains displayed. At the same time, the step stop is detected by the step stop detection circuit 21, a failure display signal due to the stop of the step is transmitted to the control center 200, the failure information is notified via the failure annunciator 27, and the stop step is performed. An output voltage corresponding to the base number is generated by the output circuit 23, the output voltage is transmitted to the control center 200 side, and is converted into a digital signal, and the section display 28 displays a numerical value “5” of the failure occurrence section.

[0008]

The above-described conventional fault section detecting device for a substation system measures time in synchronism with a time switch of a timed sequential control device for each section of a distribution line to detect a fault section. The fault detector is detected and displayed by dividing and erasing the clocked time by the closing unit time by adopting the closing and turning-on operations of the distribution circuit breaker as the start and stop conditions for the time measurement of the section detector. If a fault occurs in any of the unit distribution lines, the fault section can be detected, but for example, an accident such as a power outage, power recovery, or power outage occurs in a transmission system higher than the distribution substation 100. When this occurs, there is a problem that the following undesirable situation is exhibited.

That is, although there are various types of substation systems,
Generally, as shown in FIG.
2 and the primary substation 101, for example, a transmission line 1 of about 270,000 V, the primary substation 101 and a plurality of distribution substations 100
Transmission line 2 of about 70,000 V connecting each substation and each distribution substation 100
For example, many high voltage distribution lines 11 of, for example, about 6,000 V branched from the power line. In such a substation system, for example, a power outage, a power recovery, and a power outage occur at a location indicated by X in FIG. 10 of the transmission line 1 or a location indicated by Y in FIG. When an accident such as a power outage occurs, the distribution circuit breaker 15 and the failure section detector 16 do not operate, but are installed in the high-voltage distribution lines 11 due to a power outage in the transmission line 1 or 2 of the higher system. Automatic switches VS1 to VS7
Once the voltage is released without voltage and then the power is restored, the automatic segment switches VS1 to VS7 of the high-voltage distribution line 11 group are sequentially and simultaneously turned on. In the course of the simultaneous sequential power-on, when a power outage occurs again at the upper system, that is, at the X point of the transmission line 1 or the Y point of the transmission line 2, any of the automatic switches VS1 to VS7 of all the high-voltage distribution line 11 groups is activated. It will be locked in the open state.

However, as described above, the distribution substation 100
Even if the automatic switches VS1 to VS7 of the respective high-voltage distribution lines 11 are locked in the open state due to the occurrence of an accident such as a power outage, power recovery, or power outage in the transmission lines 1 and 2 of the upper system, In the conventional fault section detection device, since the fault section detector 16 installed for each high-voltage distribution line 11 does not operate at all, it is necessary to specify which section automatic switch is locked at a substation or the like. Can not. As a result, it is not possible to determine the location of the power failure, and even if the power is recovered from the upper system, it takes a long time to restore the power to the terminal high-voltage distribution line 11 group. During that time, the power failure state is continued over a wide range. There was a problem.

The present invention has been made in view of the above circumstances, and when an accident such as a power outage, power restoration, or power outage occurs in a transmission line of a higher system than a distribution line, the system is divided into distribution line groups. The purpose of the present invention is to provide a failure section detection device of a substation system that can identify and grasp a lock position of an automatic switch for use, and can minimize the continuation of a power failure state in terms of time and range. I have.

[0012]

In order to achieve the above object, a fault section detecting device for a substation system according to the present invention comprises a plurality of substations each having a plurality of branch lines in the middle of a plurality of distribution lines branched and connected in groups. A separate automatic switch for sectioning, a timed sequential control device, and a transformer for its power supply are installed, and a distribution breaker and each of these distribution breakers are linked to the substation side of each distribution line. If a fault occurs in a certain section of the distribution line, the substation protection device operates and the distribution circuit breaker shuts off, so that a plurality of sorting automatic switches are installed. Is released without voltage, after a certain time period, the distribution circuit breaker is reclosed, and accordingly power is applied, and a plurality of automatic switches for sorting are sequentially turned on at the set time period through the time sequential control device, Within a predetermined time after this sequential turn-on, At the same time that the automatic switch for sorting is shut off again, the automatic switch for sorting is locked in the open state, and the faulty section detector is clocked in synchronization with the time switches of the plurality of timed sequential control devices and locked in the open state. While it is configured to detect a faulty section by judging the automatic switch for section, the above-mentioned distribution line of the group unit is higher than the substation or the transmission line to the substation to which the distribution line is branch-connected. A simulated switching means that operates with a voltage value obtained by stepping down the primary voltage of the transformer of the system is provided, and another fault section detector that uses the closing / opening operation of the simulated switching means as a start condition and a stop condition for timekeeping is provided for each substation. It is characterized by being installed.

According to the present invention having the above-described structure, when a failure occurs in a section of a plurality of distribution lines branched and connected to a substation in a group unit, a power distribution cutoff installed in each distribution line is provided. The fault section can be detected as predetermined by turning on / off the device and detecting operation of the fault section detector associated therewith. If an accident such as a power outage, power restoration, or power outage occurs in a transmission system with a higher voltage than the distribution line group, the substation to which the distribution lines of each group are branched and connected or the transmission line to the substation A fault section detector separately installed for each substation operates with the closing / opening operation of the simulated switching means operating at a voltage value obtained by stepping down the primary voltage of the transformer of the higher system, and operates in the high-voltage transmission system. It is possible to identify and grasp the lock point of the automatic switch in the distribution line unit that will be locked in the open state due to the power outage, power recovery, and power outage. When the power transmission system is restored, power can be quickly restored to the distribution line group at the terminal, and both the range of the power outage state and the duration of the power outage are minimized to improve the efficiency of the operation of the distribution system and supply reliability Can be improved.

[0014] The simulated switching means in the faulty section detection device for the substation system having the above-mentioned configuration is characterized in that the simulated switching means has the same voltage value as the power supply for the automatic switching sectioning device installed in each distribution line. It is configured to work with.

Further, in the fault section detecting device for a substation system having the above-mentioned configuration, as described in claim 3, both of the fault section detectors advance in synchronization with the sequential turning on of the automatic switches for sorting. It is configured to generate an output voltage according to the number of steps, and to a control station located at a distance from the substation, digitally converts the output voltage transmitted from both fault zone detectors to digital By adopting a configuration that installs a fault section indicator that remotely displays the fault section with a preset numerical value, it is possible to prevent accidents such as power failure, power recovery, power outage in the fault section of each distribution line and the higher system The lock point of the automatic classifying switch caused by the occurrence can be accurately grasped and managed at the remote control station, and the substation system can be restored efficiently in a shorter time.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a main part of a fault section detection device for a substation system according to the present invention, in which a plurality of high-voltage branches are connected in a group unit to a transformer secondary side of a distribution substation 100. Each of the distribution lines 11 is provided with a plurality of, for example, seven automatic switches VS1 to VS7 for division, time-sequential control devices 13-1 to 13-7, and power transformers 14-1 to 14-7 thereof, As a result, each high-voltage distribution line 11 is divided into first to eighth sections 11-1 to 11-8, and a distribution circuit breaker 15 is provided at the distribution substation 100 side of each high-voltage distribution line 11. And a fault section detector 16 interlocked with each of these distribution circuit breakers 15, and is closed and opened at a voltage value obtained by lowering the primary voltage of the transformer of the transmission system higher than the high-voltage distribution line 11. The simulated opening / closing means 3 which operates is provided. Another fault interval detector 12 is installed in the distribution substation 100 units of closed opening operation and start condition, stop condition of the clock.

In FIG. 1, a plurality of high voltage distribution lines 11 are shown.
Among them, the two high-voltage distribution lines 11 and the devices and devices installed therein are indicated by the symbols A and B as in FIG. 7, but these two high-voltage distribution lines 11A,
The high-voltage distribution lines 11 other than 11B have exactly the same configuration.

As shown in FIG. 2, the simulated opening / closing means 3 has a voltage value obtained by stepping down the primary voltage of the transformer at the X point of the transmission line 1 in the substation system shown in FIG.
The primary voltage of the transformer at the point is closed at an operating voltage set to a voltage value reduced to a voltage value equal to or higher than the voltage of the transformer, and the timekeeping operation of the faulty section detector 12 installed in the distribution substation 100 is started, and
When a voltage lower than the reset voltage lower than that is continued for a specified time or more, it is opened to stop the time measurement of the faulty section detector 12 and return.

In addition to the above, the configuration of the internal circuit of the faulty section detector 12 installed in each distribution substation 100 unit is such that the contact 15F is turned on / off in conjunction with the opening / closing of the simulated opening / closing means 3.
Except for the point F, the configuration is the same as that of the internal circuit of the faulty section detector 16 shown in FIG. 6 installed in the group of high-voltage distribution lines 11, so that the illustration and description thereof are omitted. Further, the first to eighth sections 11 of the distribution line 11 (11A, 11B)
-1 to 11-8 when there is no failure and distribution line 11
The operation outline when a failure occurs in any of the first to eighth sections 11-1 to 11-8 of (11A, 11B) is substantially the same as that shown in the time charts of FIGS. Therefore, description of these operation time charts is also omitted.

The operation of the faulty section detector 12 using the closing / opening operation of the simulated switch 3 having the configuration shown in FIGS. 1 and 2 as a start condition and a stop condition for time measurement will be described with reference to the flowchart of FIG. I will explain briefly. If the power transmission line 1 or 2 has no power failure and normal power transmission is performed at an operating voltage or higher, the simulated switch 3 is closed, the contact 15F of the faulty section detector 12 is turned on, and power is input (step S11) is present. As a result, the fault section detector 12 is activated, and the stepping circuit 18 steps 1, 2, 3,... (Step S12), and the number of sections 1 corresponding to the number of steps is determined.
1-1 to 11-8 are sequentially displayed on the display 21 via the section display circuit 20. At this time, if there is no failure, the eighth section 1
The display of the sections up to 1-8 is completed, and after a lapse of a predetermined time or more (step S13), the display automatically returns to the standby state (origin) (step S14).

On the other hand, as shown in FIG.
If an accident such as a power outage occurs at the X location in FIG. 10 of the transmission line 1 or the Y location in FIG. All automatic switches VS1 to VS7 are simultaneously released with no voltage, and then the power is restored.
When one group of automatic switches VS1 to VS7 is sequentially and simultaneously turned on, and the power is restarted at the upper system, that is, at the X point of the transmission line 1 or the Y point of the transmission line 2 during the sequential injection, all the high-voltage distribution is performed. Automatic switching switches VS1-
Any one of the VSs 7 will be locked while left open. FIG. 4 shows a state in which the automatic section switch VS3 is locked in an open state.

As described above, any one of the automatic switches VS1 to VS7 of the high-voltage distribution line 11 group is in an open state due to the occurrence of an accident such as a power outage, power recovery, or power outage in the transmission line 1 or 2 of the upper power transmission system. When locked as it is, the distribution circuit breaker 15 installed corresponding to each group of the high voltage distribution lines 11 and the fault section detector 16 associated therewith do not operate, so that the conventional circuit breaker shown in FIGS. In the device, it is not possible to identify which automatic switch is locked in the distribution substation 100 or the control station 200.

However, according to the present invention, when a power failure occurs in the transmission line 1 or 2, the simulated switch 3 is opened, the contact 15F of the faulty section detector 12 is turned off, and there is no power input (step S11). ), The stepping circuit 18 in the failure section detector 12 stops stepping there (step S15), and the output voltage corresponding to the number of stopped steps is output by the output circuit 23 of the failure section detector 12.
, And the output voltage is transmitted to the control center 200 side, and is converted into a digital signal, and a numerical value “3” of the failure occurrence section is displayed on the section display 28 (step S16).
Therefore, it is possible to specify in the control center 200 which of the automatic switches VS1 to VS7 of the group of high-voltage distribution lines 11 is locked. Thereafter, a section return command is input (step S17).

As described above, even when an accident such as a power outage, power restoration, or power outage occurs in the transmission line 1 or 2 in the higher system than the high-voltage distribution line 11, a faulty section installed in the distribution substation 100 is detected. It is possible to identify and grasp which section automatic switch of the high voltage distribution line 11 of each group is locked by the operation of the switch 12, so that the transmission line 1 or 2
When the power is restored, the power can be quickly restored to the terminal high-voltage distribution line 11 group, thereby avoiding the continuation of the power failure state over a wide area and for a long time.

The faulty section detectors 12 and 16 may or may not be provided with the display circuit 20 and the display 21.
At 00, the output voltage transmitted from the fault section detectors 12 and 16 is digitally converted, and a fault section indicator 28 for remotely displaying the fault section or the lock point of the group of distribution lines 11 is installed. It is possible to accurately grasp and manage the failure section and the lock position of the automatic switching section in the remote control center 200, and to efficiently recover from an accident such as a failure or a power failure in a shorter time.

[0026]

As described above, according to the present invention, when a fault occurs in a section of a plurality of distribution lines branched and connected to a substation in a group unit, the failure section is divided into distribution line units. Not only can it be detected as specified, but also power outages,
When an accident such as a power outage occurs and one of the automatic switches in the distribution line unit is locked accordingly, the locked position can be specified and grasped in the substation unit. Therefore, when the high-voltage transmission system at the upper level of the distribution line is restored, the restoration to the terminal distribution line group can be performed very quickly, and both the range of the power failure state and the duration of the power failure are minimized. As a result, the operation efficiency of the power distribution system and the supply reliability can be significantly improved.

In particular, by using the structure of claim 3 together,
Control sections at remote locations should accurately grasp and manage the faults in each distribution line and the lock locations of automatic switchgears caused by accidents such as power outages, power restorations, and power outages in higher-level systems. And the entire substation system can be efficiently restored in a shorter time.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a main part of a fault section detection device for a substation according to the present invention.

FIG. 2 is an operation flow chart of a simulated switch in the above device.

FIG. 3 is a flowchart illustrating the operation of the above device.

FIG. 4 is a block diagram illustrating an operation state when an accident such as a power outage, power restoration, or power outage occurs in a substation system higher than a distribution line.

FIG. 5 is a basic configuration diagram of a conventional substation fault section detection device.

FIG. 6 is a block diagram of an internal configuration of a fault section detector in the conventional device.

FIG. 7 is a schematic block diagram illustrating an operation state when a failure occurs in the middle of a distribution line in the conventional device.

FIG. 8 is a time chart showing an outline of an operation of the conventional device in the case where there is no failure.

FIG. 9 is a time chart showing an outline of an operation when a distribution line has a failure in the conventional device.

FIG. 10 is a schematic diagram illustrating an example of a substation system.

[Explanation of symbols]

 1, 2 Transmission line 3 Simulated switch 11 High voltage distribution line 12 Fault section detector for each substation 13-1 to 13-7 Timed sequential control device 14-1 to 14-7 Power transformer 15 Power distribution breaker 16 Fault section detector for each distribution line 18 Step circuit 28 Section indicator 100 Distribution substation 101 Primary substation 102 Power supply 200 Control station

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Norihara Inohara 3-3-22 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture Inside Kansai Electric Power Co., Inc. (72) Inventor Toshiharu Minami 3-14-40 Senrioka, Settsu-shi, Osaka Toko Seiki Co., Ltd. (72) Inventor Junji Matsumoto 3-14-40 Senrioka, Settsu-shi, Osaka Toko Seiki Co., Ltd.

Claims (3)

[Claims] 1. A plurality of automatic switches for segmentation, a timed sequential control device, and a transformer for power supply thereof are respectively installed in the middle of a plurality of distribution lines branched and connected to a substation in groups. At the substation side of each distribution line, a distribution breaker and a failure section detector linked to each distribution breaker are installed. If a failure occurs in a section of the distribution line, the substation When the protection device operates and the distribution circuit breaker shuts off, the plurality of automatic switches for division are released without voltage, and after a certain time,
The power distribution circuit breaker is reclosed and power is applied accordingly, and a plurality of automatic switches for sorting are sequentially turned on in a set time period via the timed sequential control device, and power is distributed within a predetermined time period after the sequential turning on. At the same time as the circuit breaker is shut down again, the automatic switch for sectioning is locked in the open state, and the faulty section detector measures the time in synchronization with the time switches of the timed sequential control devices to open the state. While it is configured to detect a faulty section by judging the automatic switch for division which is locked as it is, the substation to which the distribution line of the group unit is branch-connected or to the substation is connected. A simulated switching means is provided which operates with a voltage value obtained by stepping down the primary voltage of the transformer of the higher system from the transmission line. Installed at each substation A fault section detection device for a substation system. 2. The substation failure according to claim 1, wherein the simulated switching means is configured to operate at the same voltage value as a power supply for the automatic switch for sectioning installed in each distribution line. Section detection device. 3. Both of the faulty section detectors are configured to advance in synchronization with the sequential switching of the automatic switches for sorting, and to generate an output voltage according to the number of steps, and A fault zone indicator is installed at the control station at a location away from the site to digitally convert the output voltage transmitted from both fault zone detectors and remotely display the fault zone of the distribution line with a preset numerical value. The fault section detection device for a substation system according to claim 1 or 2, wherein: