JP3953495B2 - Security management method in power supply system - Google Patents

Description

  The present invention relates to a security management method capable of reliably preventing accidents such as electric shock accidents and fires by contacting an object such as a human body or a vehicle with an electric power supply line after an earthquake occurs in an electric power supply system. .

Conventionally, the distribution line fault section detection and disconnection device, which has been put to practical use as an uninterruptible protection method, by the power supply company, etc., detects a ground fault by overcurrent when a ground fault occurs. Is automatically detected as an accident in the section, and the section switch is opened to stop power transmission. However, in other sections, flexible power transmission from another route was performed.
However, it has been pointed out that, in the case of a ground fault accident, after the occurrence of a high voltage ground fault accident, the short-circuited part is burned out due to a short-circuit short etc., and the short-circuit accident disappears. .
In recent years, OA and FA have progressed, and the transformation to a highly information-oriented society has had a significant impact on society even with short-time power outages. It has been put to practical use as a method.

However, in the conventional system, the ground fault is extinguished and the section switch is closed, or the section where the ground fault occurred due to the interchangeable power transmission by the uninterruptible protection method is being supplied with high voltage There is a risk of occurrence.
In fact, on the evening of July 23, 2005, there was a strong earthquake with a seismic intensity of 5 that hit the Kanto region.
There was an accident in which the high-voltage power transmission tower collapsed due to the earthquake, and the roof of the house that touched the broken high-voltage line burned.
In this case, there are concerns about two problems of the two conventional systems.
First, even if an earthquake occurs, power transmission is not stopped, or even if power transmission is stopped once, power transmission is resumed. Even if a conventional system detects a ground fault once, a short circuit is shorted. As a result, the ground fault will be extinguished, which means that there is a dangerous situation in which the transmission line with high voltage is left hanging.
Second, as in the conventional earthquake countermeasure system, a system that issues an alarm when an earthquake P wave is detected responds to a direct-type earthquake that is very close to the epicenter, with no power transmission stopped. It is a problem that correspondence is not in time.

  In addition, in the Great Hanshin-Awaji Earthquake on January 17, 1995, there was a fire example that ignited a leaked gas and broke out. This is at 9:05 am, in the kitchen part of the apartment house, and the fluorescent lamp switch. Fluorescent lamps usually do not have explosion-proof properties and have a large inductance value, so the ignition range exceeds the ignition limit even with a small current. In the inspection after a power failure, a distribution board that can check whether the switch is turned on or off when the short circuit current consumption is 1 mA or less is required.

In the DM method, when a ground fault is detected, the substation circuit breaker is set off for 1 second, and after about 1 minute, it is turned on and sequentially turned on. It is supplied twice at the accident site.
In the section detection method, when a ground fault is detected, the normally open section switch is turned on by a code signal from a slave station, and reverse transmission power transmission is performed. In addition, it has been pointed out that the ground fault accident location is shifted to a high-voltage short-circuited short circuit and the like and becomes open, and the accident is extinguished.

Next, in the case of the uninterruptible protection system of the conventional system shown in FIG.
In FIG. 3, the circuit breaker 1-2 is a circuit breaker connected to the bus line from the substation A. Further, the section switches DM1 to DM8 are connected to the high-voltage bus from the circuit breaker 1-2. Of these, DM1, 2, 3, 5, and 7 are normally closed section switches, and DM4, 6, and 8 are normally open section switches. The sections protected by these segment switches are defined as the first section to the sixth section as shown in FIG. The normally open section switches DM4, 6, and 8 are for performing reverse transmission from the distribution system on the circuit breaker 1-1, substation B, and substation C side of substation A, respectively.

The division switches DM1 to DM8 are provided with slave stations 1 to 8 for shutting off and opening from the master station 20, respectively. As shown in FIG. 1, the slave station 2 of the segment switch DM2 includes the slave stations 4 and 6 of the normally open segment switches DM4 and DM6 and DM8 when a ground fault occurs in the third section. In addition, a setting command signal is transmitted to the slave station 8 through the communication line 30. As a result, when an accident occurs in the third section, the normally open section switches DM4, 6, 8 are turned on by the slave station signal, and the reverse transmission power transmission to the fourth section, the fifth section and the sixth section is performed. Is called.
After that, by opening the division switches DM2, DM3, DM5, DM7, only the third section, which is the failure section, goes out of power, and the other healthy sections are continuously distributed without power outage.
When sending a command signal for the normally open division switches DN4, DN6, DN8 to the slave stations 4, 6, 8 of the division switch DM2, three slave stations 4, 6, 8 are used in a general communication system. On the other hand, the input command signal is generated together with the slave station identification code. Accordingly, the three slave stations sequentially receive the making command signal and shift to the section switch making operation.
In the event of a ground fault in the distribution line, the circuit breaker at the substation is set to shut off after about 1 second.
The above-mentioned countermeasure technique is such that when a ground fault is detected in the high-voltage distribution line section, the slave station of the section switch having a ground fault detection function is a slave station of the normally open section switch through the communication line. Is transferred to the operation, and reverse transmission power transmission is performed.
However, at the ground fault location in the ground fault section, there is a risk that the short circuit will be burnt out due to a short circuit due to high voltage, and the short circuit state may disappear, but since the accident location is limited, the accident is within the protection section Since it cannot be separated as an accident, it is not suitable for ground fault accident countermeasures for high-voltage distribution line sections during an earthquake.

In this way, in the conventional method, in the ground fault accident location, the problem that the short circuit accident becomes an open state due to the short circuit short etc. from the high voltage ground fault and the short circuit accident disappears has not been solved, It has been pointed out that it is incapable of dealing with problems when power transmission resumes.
In addition, when the distance from the epicenter is short, there is a problem that it is not in time to cope with it after detecting the earthquake P wave.

The present invention was made in view of the above problems, in recent years, to detect the earthquake before generating Seismic emits a Earthquake Early warning signal by analyzing the acoustic waveform of該地sound technology ( For example, paying attention to the development of JP 2000-193753), using such an early earthquake warning signal, safety is ensured in a section where a ground fault accident due to an earthquake or the like has occurred even after power transmission is resumed. For the purpose.

In claim 1 of the present invention,
A master station having a function of receiving an early earthquake warning signal and a slave station having means for controlling opening / closing of each division switch and a ground fault detection means for detecting a ground fault are connected by a communication line. In the security management method in the power supply system
When the master station receives the early earthquake warning signal, the master station sends an alarm signal to each slave station,
Slave station was once detected the alarm signal and the ground fault is after resuming power transmission are also characterized by protecting the section to open the section switch corresponding to the section that detected the ground fault accident.
In claim 2,
The power supply system includes a sales office master station arranged in a predetermined section, a customer distribution board, and a customer slave station,
The customer distribution board uses a main disconnector that can cut off the power supplied via the section switch using the energy supplied from the independent energy storage means, and a current limiting function based on the discharge current of the neon discharge tube. In the security management method in the power supply system including the current limiting circuit, the detecting means for detecting the predetermined current flowing through the current limiting circuit, and the manual transmission operating means operable by the consumer,
The consumer slave station is
After receiving the alarm signal and detecting a power failure, opening the main disconnector using energy supplied from the independent energy storage means, and switching to a current limiting circuit using the neon discharge tube,
When power transmission is resumed, the current consumption when the secondary line of the customer distribution board is short-circuited is limited by the current limiting circuit to make it difficult to become an ignition source, and flows to the current limiting circuit. When a predetermined current is detected by the detection means, an identification signal 1 is sent to the sales office master station,
When the manual transmission operation means is operated by the consumer, the identification signal 2 is transmitted to the sales office master station.
In claim 3,
The current limiting circuit uses a current limiting function based on a discharge current of a neon discharge tube to limit a current consumption when a secondary line of the distribution board is short-circuited to a predetermined current, and the secondary side The line voltage is limited to a predetermined voltage or less.
In claim 4,
The Earthquake Early warning signal, detects the pre-earthquake Seismic is characterized in that based on the signals obtained by analyzing the acoustic waveform of該地sound.

  In addition, it is good to provide the alerting | reporting means which alert | reports the state of the said main disconnector, the state of the low current of the current limiting circuit detected by the said detection means, etc.

According to the present invention,
The slave station that once detected the alarm signal and the ground fault can open the section switch corresponding to the section where the ground fault was detected and protect the section even after resuming power transmission. Occurrence of accidents such as fire due to
Also,
In the customer slave station, since the independent energy storage means is provided, even in a power failure state immediately after the occurrence of the earthquake, the accident is caused inside the customer home after the main disconnector is opened and power transmission is resumed. At the same time, it has the function of switching to the current limiting circuit using the neon discharge tube and sending the identification signal 1 and identification signal 2 to the sales office master station, so that the sales office master station grasps the state of each customer. Power transmission can be resumed while each customer can easily take measures.

Also,
As accident the accident in the protected section, about 1 minute after the restart transmission waiting the demand Ienoko stations for other sound intervals with disconnecting the battery or the like after a lapse of a predetermined time by the power failure and the alarm signal With the output of electrical energy from the independent energy storage means, the main disconnect switch is opened and then switched to the neon limited current circuit. For restarting power transmission, the slave station detects the rated current after a lapse of a predetermined time from the neon limited current, and the identification signal 1 Automatically sent to the communication line.
In addition, the customer after restarting power transmission operates the manual transmission button installed in the slave station, transmits it to the communication line as the identification number 2, and can confirm the supply of the healthy section by receiving the sales office and protect it Measures to restore the service lines for customers on the section and supply with generators, etc.

further,
About 1 minute after the resumption transmission waiting demand Ienoko station, after opening the trunk disconnector on battery output after a predetermined time due to a power failure and the alarm signal, it switches to neon current limiting lighting circuits in the disconnector, distribution board The current that flows when the secondary side of the wire is short-circuited (hereinafter simply referred to as “line-to-line short-circuit current consumption”) is less than a predetermined current (for example, 1 mA), making it difficult to become an ignition source and checking. Work and removal work and removal work can be done. Therefore, it becomes easy to perform safe use at your own risk.
Also,
Method of blocking the leakage breaker which is the main trunk with alarm signal and shake information sent by the wired and wireless communication lines, hardly malfunctions occur, also blocking gas leak alarms, when there is no input of the alarm signal Can not be shut off, so alarm and earthquake countermeasures can be taken.
Also,
The operation check of the main earth leakage breaker breaker can be installed in a circuit that can be checked without turning it off.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
The embodiment described in claim 1 will be specifically described with reference to the drawings.
11 is a warning station that transmits Earthquake Early warning signal, detects the earthquake before generating Seismic, techniques that can detect the occurrence of an earthquake early by analyzing the acoustic waveform of該地sound (JP 2000- 193753) etc., an early earthquake warning signal is transmitted.
Reference numeral 12 denotes a master station having a function of receiving the early earthquake warning signal and a function of sending an alarm signal based on the early earthquake warning signal to each slave station, and is disposed in a substation, for example.
21 to 28 and means for opening and closing controls each section switch 31-38, ground fault you detect ground fault in the primary and secondary sides of the respective section switches with current transformer (CT), etc. A slave station provided with accident detection means.
The above master station and slave stations are connected by a communication line 4.
The normally closed section switches 31, 32, 33, 35, and 37 are closed, and the normally open section switches 34, 36, and 38 are opened to perform normal power transmission.

In the security management method in the power supply system configured as described above,
When the master station 12 receives the early earthquake warning signal, the master station 12 sends an alarm signal to each of the slave stations 21 to 28.
For example, when a ground fault occurs in the third section, the normally open section switches 34, 36, 38 are closed by the selective input signal from the master station 12, and flexible power transmission is performed.
In this case, the warning signal and the ground fault once detected slave station 22, 23, 25, and 27, even after the power is resumed by accommodation power, etc., sectionalizing switch corresponding to the section that detected the ground fault accident Open the vessel to protect the section.

In addition, as shown in FIG. 2, the power supply system includes a sales office master station 5 arranged in a predetermined section, and customer distribution boards 61, 62, 63-connected to the sections. , Consumer slave stations 71, 72, 73, and so on.
The customer distribution board, for example, the customer distribution board 61, includes a main disconnector 612 that can cut off the power supplied via the section switch using energy supplied from the independent energy storage means 611, and a neon discharge. A current limiting circuit 614 using a current limiting function based on a discharge current of the tube 613; a detecting means 615 for detecting a predetermined current flowing in the current limiting circuit 614; and a manual transmission operating means 616 operable by a consumer. Yes.
Since the configuration of the consumer distribution board 61 is the same in the other consumer distribution boards 62, 63, the description thereof will be omitted.

In the customer slave station 71,
After receiving a warning signal from the master station 12 or the branch office 5 and detecting a power failure due to a ground fault, the main disconnector 612 is opened using energy supplied from the independent energy storage means 611. , Switching to the current limiting circuit 614 using the neon discharge tube,
When a predetermined current flowing through the current limiting circuit 614 is detected by the detecting means 615 after power transmission is resumed , the identification signal 1 is sent to the sales office master station 5,
When the manual transmission operation means 616 is operated by the customer, the identification signal 2 is sent to the sales office master station 5.
Accordingly, the sales office master station 5 can grasp the situation on the secondary side of the customer distribution board 61 and the identification signal 2 is transmitted by the customer's own hand, so that the customer can start work at his / her own responsibility. It is.

In addition,
The Earthquake Early warning signal, detects the pre-earthquake Seismic, is based on the signals obtained by analyzing the acoustic waveform of該地sound.
The signal is a technology for obtaining an early earthquake warning signal by detecting a squeal before the occurrence of an earthquake and analyzing a sound wave waveform of the squeal, and is disclosed in Japanese Patent Laid-Open No. 2000-193753.
This technology is an earthquake early detection method that detects low-frequency (50-150 Hz) ground squealing that precedes the rupture of a crustal source fault by a receiving array (receiver) placed in the ground. When the frequency rumbling continues for a predetermined time and the volume tends to increase, it is determined that the mainshock is imminent and an early earthquake warning signal is issued based on this determination.

In each figure,
Each slave station and business of a normally open and normally closed switch having an earthquake ground fault detection function from a master station 12 in a substation that receives an alarm signal based on an early earthquake warning signal via a communication medium such as a feeder line A warning signal is transmitted to the parent station through the communication line 4, and a ground fault detection signal is transmitted to the parent station 12 through the communication line 4 from the slave station of the section switch when a distribution line section fault is detected by the seismic shear wave S wave. A command code including a selective input signal is transmitted from the master station 12 through the communication line 4 to the slave stations 21 to 28 and the sales office master station 5 of each division switch, and the communication line 5 is transmitted from the sales office master station 5. After sending an alarm signal from each terminal to the customer slave stations 71, 72, 73, etc., each customer supply information about 1 minute after the power failure due to the earthquake is sent to the sales office parent through the communication line 4 by the identification signal 1. It is sent to station 5.
As the communication line 4, a wired or wireless communication medium is used alone or in an overlapping manner as appropriate.

After transmitting the warning signal to each slave station of the normally-open and normally-closed class switch having the function of detecting an earthquake ground fault through the communication line 4 and the sales office master station 5, the ground fault of the high-voltage distribution line section due to the seismic shear wave S wave In the embodiment shown in the block diagrams of the first to fourth sections, countermeasures after transmitting a ground fault detection signal from the slave station of each section switch at the time of detection to the distribution line ground fault detection master station through the communication line 4 A specific description will be given based on this.
1. For example, when the first section is a ground fault detection location, the master station 12 transmits a command code to the communication line 4 before releasing the setting for 1 second, and then the circuit breaker 1-2 of the substation A. Is opened for 1 second.
2. The slave station 24, the slave station 23, and the slave station 22 recognize that the input command signal for itself is set for about 1 minute by the command code, and the slave station 21 recognizes that it is an open maintenance command for itself. While keeping the section switch 31 open, the circuit breaker 1-2 of the substation A maintains the setting for 1 second, disconnects the first section as a protection section, and facilitates reverse transmission power transmission to other healthy sections Do

3. For example, when the second section is a ground fault detection location, the master station 12 transmits a command code to the communication line 4 before opening the setting for 1 second, and then the circuit breaker 1-2 of the substation A. Is opened for 1 second.
4). The slave station 24 and slave station 23 recognize that the input command signal for itself is set for about 1 minute by the command code, and the slave stations 21 and 22 recognize that it is an open maintenance command for itself, While maintaining the devices 31 and 32 open, separating the second section as a protection section, making it easier to perform reverse transmission power transmission to other healthy sections, and setting the circuit breaker 1-2 at substation A for about 1 minute Then, power is transmitted to the first section.

5). For example, when the third section is a ground fault detection location, the master station 12 transmits a command code to the communication line 4 before opening the setting for 1 second, and then the circuit breaker 1-2 of the substation A. Is opened for 1 second.
6). The slave station 24, 26, 28 recognizes that the input command signal for itself is set for about 1 minute by the command code, and recognizes that the slave station 22, 23, 25, 27 is an open maintenance command for itself. The section switches 32, 33, 35, and 37 are kept open, the third section is cut off as a protection section, and it is easy to perform reverse transmission power transmission to other healthy sections. 2 is set for about 1 minute and transmits power to the first and second sections.

7). For example, if the fourth section is a ground fault detection location, the master station 12 sends a command code to the communication line before the 1-second setting is released, and then turns on the circuit breaker 1-2 at substation A. Release the setting for 1 second.
8). Based on the command code, the slave station 23 recognizes that it is an open maintenance command for itself, maintains the section switch 33 open, disconnects the fourth section as a protection section, and the circuit breaker 1-2 of the substation A is about 1 minute setting is input, and power is transmitted to the first section, the second section, the third section, the fifth section, and the sixth section.

Alarm signal demand Ienoko station through a communication line from the sales office master station 5 and after each device or the like is received, a power outage caused by the earthquake, to other health section disconnected as accident of protected areas tube against the distribution line sections ground fault, about The slave station of each customer who is waiting for resumption of power transmission after 1 minute detects the alarm signal and a power failure due to a ground fault and opens the main disconnector with the output of the battery etc. after a predetermined time and switches to the neon limit circuit In response to restart transmission, the customer's slave station detects the rated current after a lapse of a predetermined time from the neon current limit, and automatically transmits it as an identification signal 1 through the communication line. By operating the manual transmission operation means 616 such as the above, the identification signal 2 is transmitted to the sales office master station 5 through the communication line.

FIG. 2 is a block diagram including a customer slave station 71 and a customer distribution board 61.
1 receives the warning signal based on the early earthquake warning signal, and the warning signal is connected to each terminal through a communication line. The sales office master station receives the identification signal 1 and the identification signal 2 that are transmitted to the device or the like and become the re-transmission information of the customer slave station after the earthquake power failure.

This will be specifically described with reference to FIG.
After receiving the alarm signal through the communication line, the customer's slave station 71 (primary feed control earthquake alarm signal receiving device) after the power failure due to the ground fault accident detects the alarm signal and the power failure due to the ground fault accident . switching trunk disconnector 612 over time after battery (with the line detection function) to the current limiting circuit 614, the supply wait for about 1 minute after the power outage.
After receiving the "Note-alarm signal, a power outage is possible to operate after a lapse of a predetermined time. Instantaneous power failure countermeasures ”

  For supply after about 1 minute, the rated current is detected and identified after the elapse of a predetermined time from the neon limit current of the slave station (primary feed control earthquake alarm signal receiver) installed in the primary feed circuit. The signal 1 is automatically transmitted to the communication line, and the consumer after restarting power transmission transmits the identification signal 2 to the communication line when the manual transmission operation means 616 such as a manual button installed in the slave station is operated by the consumer.

The function of the main disconnector 612 (with a line-to-line detection function) will be specifically described with reference to a block diagram showing a control system.
A slave station (primary feed control seismic alarm receiver) connected to a primary outlet breaker (neon check function / disconnector with security circuit) connected to a single-phase or single-phase three-wire supply circuit, and a supply circuit It is constituted by a load circuit connected to a four-circuit branch breaker connected to a main earth leakage breaker (disconnector) connected to a main disconnector connected to (with line-to-line detection function).

When an earthquake warning signal is transmitted from a communication line via wire and / or wireless, after a customer's slave station (primary feed control earthquake warning signal receiver) receives it, a distribution line accident such as a ground fault caused by an earthquake shear wave S wave slave station blackout by, using the alarm signal, after a predetermined time has elapsed the trunk disconnector by detecting the power failure by a ground fault, the energy supplied from independent energy storage means 611 such as a battery tripping The coil is actuated to be opened, and the current is switched to the neon current limiting circuit 614 and waits for supply after about one minute.

The voltage side L1-a for resumption of power transmission after about 1 minute from the auxiliary switch connected in series to the check LED (red) connected in series to the neon current limit (green) connected to the auxiliary switch of the main disconnector from L1-b From the L1 main earth leakage breaker to the ground side N from the load of branch breakers B1 and B3. The current consumption (line short circuit consumption current) that flows when the circuit is short-circuited is 1 mA or less. The voltage side L2-a for resumption of power transmission after about 1 minute from the auxiliary switch connected in series to the check LED (red) connected in series to the neon current limit (green) connected to the auxiliary switch of the main disconnector from L1-b From L2 main earth leakage breaker to branch side breaker B2 / B4 load to ground side N. The short-circuit current consumption between the lines of this circuit is a predetermined current (for example, 1 mA) or less. Further, the line voltage of this circuit is a predetermined voltage (for example, 35 volts) or less.
With such a line short-circuit current consumption and line voltage, there is little risk of electric shock. Electric shock is also called electric shock. For example, when an exposed wiring is touched, a current flows through a route of wiring → hand → body → foot → floor (ground), and in the worst case, death may occur. The degree of electric shock varies greatly depending on the current value flowing through the human body and the electric shock time, and also varies depending on the constitution, age, health condition, and the like. In general, when the current at the commercial frequency is 1 mA, the skin feels to the extent that it is felt at 5 mA. Furthermore, at 50 mA it is quite dangerous, and at 100 mA it is fatal. Regarding the safety limit of lethal current, Professor Darziel's formula is known.
The line-to-line short-circuit current consumption and line-to-line above meet the definitions of 40 volts or less as defined in Article 225 and 3.5 mA or less in the case of a short circuit as defined in Article 224. is there.

The start of use after the supply is resumed after a power failure due to an earthquake will be specifically described based on the embodiment of the inspection explanation.
As a method of starting use after resumption of supply, for example, “5-circuit residential distribution panel” is described as follows.

“When electricity is restarted, it automatically becomes a security circuit and the security device is operating, but the branch circuit is an inspection circuit.
When using, confirm the neon (green) lighting in the disconnector of the main circuit and the circuit check LED (red) lighting, and then perform the following operations.
* Caution * Turn on the main circuit disconnector after checking the circuit. *Note*
1. After confirming that all branch breakers are opened and the circuit check LED is turned off (1), the LED (red) that closes the branch breaker is turned on, and the LEDs that open switches such as fixtures are turned off.
The LED (red) that closes the branch breaker in (2) is turned on, and the LED that opens the switch of the instrument is turned off.
The LED (red) that closes the branch breaker in (3) is turned on, and the LED that opens the switch of the instrument is turned off.
The LED (red) that closes the branch breaker in (4) is turned on, and the LED that opens the switch of the instrument is turned off.
2. During circuit inspection, LED (red) that closes the branch breaker such as ground fault / short circuit is lit, and after confirming that the LED is turned off by removing ground fault / short circuit fault, etc., manually close the main disconnect switch, neon (green) ) Goes off. (1)-(4) While confirming the safety of equipment switches and insertions in each circuit. It becomes use start.
3. Check the operation of the evacuation switch, open the primary feed breaker, close the branch breaker in (5), and the evacuation switch is activated when the check neon lights. Reset after confirmation. The primary feed breaker is closed.
4). The branch breaker is closed and the LED (red) lights up. The short-circuit current consumption of this circuit is less than 1 mA, and it is difficult to become an ignition source, so inspection work and trouble removal work are easy. "

A communication line, alarm signal demand Ienoko station receiving the (primary feed control seismic alarm signal receiving apparatus), after a predetermined time power failure the alarm signal, after release neon limit current trunk disconnector on battery output Switch to inspection circuit and wait for supply. In response to restart transmission, the slave station detects the rated current after a lapse of a predetermined time from the neon limit current, and transmits the identification signal 1 and the identification signal 2 to the sales office master station through the communication line.

  An embodiment of a device having a shut-off function that shuts off the main earth leakage breaker with an alarm signal and shaking information will be specifically described with reference to FIG.

A seismic apparatus for automatically blocked by the trunk security intercom connection to earth leakage breaker housing distribution panel (with circuit inspection function), alarm signals and shake information of the connection to a manual shut-off device of the installed ground fault interrupter beside a device for automatically blocking with alarm signals and a gas leakage alarm signal connection to the blocking device, constituted by primary feed breaker (with neon inspection function), from wired and wireless communication line, receiving the alarm signal seismic After detecting a predetermined shake, the device is an earthquake countermeasure by blocking the breaker with the rated sensitivity current detection function of the primary earth leakage breaker with N pole connection for primary feed.

Or, gas leak alarm device which receives the alarm signal of the earthquake, after gas leak detection, the earthquakes in blocking the same breaker at rated sensitivity current detecting function main trunk leakage breaker of the N pole connection of the primary feed.

  As a countermeasure when evacuating in the event of an earthquake, the breaker is shut off with the rated sensitivity current detection function of the main earth leakage breaker connected to the N pole of the primary feed by operating the manual breaker installed next to the security intercom. .

When the customer returns home and the main leakage breaker is “OFF”, after confirming safety, the primary feed breaker is opened and the main leakage breaker is closed. Therefore, the operation check and resetting operation of the operating device are facilitated.
Incorporating not only power outage countermeasures on the supply side but also countermeasures that can be inspected without turning off at normal times will increase the importance of safety measures by consumers and raise awareness of disaster prevention.

It is a block diagram which shows the structural example of the power supply system with which the security management method in the power supply system of this invention is applied. It is a block diagram including a consumer distribution board and a consumer slave station. It is a block diagram of the electric power supply system of a prior art example.

Explanation of symbols

1-1 to 1-5: Substation circuit breaker 1st to 6th sections: High-voltage power transmission lines 31, 32, 33, 35, 37: Normally closed section switches 34, 36, 38: Normally opened section switches 21 , 22, 23, 25, 27: Slave stations of normally closed section switches 24, 26, 28: Slave stations of normally open section switches,
21-28 : Ground fault detection device 12: Master station 4: Communication line 5: Sales office master station 11: Earthquake information stations 71, 72, 73, ...: Consumer slave stations (primary feed control earthquake alarm signal receiver)
612: Disconnector of customer disconnector 61 (with line detection function)
61, 62, 63, ~: Distribution board

Claims (4)

A master station having a function of receiving an early earthquake warning signal and a slave station having means for controlling opening / closing of each division switch and a ground fault detection means for detecting a ground fault are connected by a communication line. In the security management method in the power supply system
When the master station receives the early earthquake warning signal, the master station sends an alarm signal to each slave station,
Slave station was once detected the alarm signal and the ground fault is after resuming power transmission also, in the power supply system, characterized in that by opening the section switch corresponding to the section that detected the ground fault accident to protect the segment Security management method. The power supply system includes a sales office master station arranged in a predetermined section, a customer distribution board, and a customer slave station,
The customer distribution board uses a main disconnector that can cut off the power supplied via the section switch using the energy supplied from the independent energy storage means, and a current limiting function based on the discharge current of the neon discharge tube. In the security management method in the power supply system including the current limiting circuit, the detecting means for detecting the predetermined current flowing through the current limiting circuit, and the manual transmission operating means operable by the consumer,
The consumer slave station is
After receiving the alarm signal and detecting a power failure, opening the main disconnector using energy supplied from the independent energy storage means, and switching to a current limiting circuit using the neon discharge tube,
When power transmission is resumed, the current consumption when the secondary line of the customer distribution board is short-circuited is limited by the current limiting circuit to make it difficult to become an ignition source, and flows to the current limiting circuit. When a predetermined current is detected by the detection means, an identification signal 1 is sent to the sales office master station,
2. The security management method in the power supply system according to claim 1, wherein when the manual transmission operation means is operated by a consumer, the identification signal 2 is sent to the sales office master station. The current limiting circuit uses a current limiting function based on a discharge current of a neon discharge tube to limit a current consumption when a secondary line of the distribution board is short-circuited to a predetermined current, and the secondary side The security management method in the power supply system according to claim 2 , wherein the circuit is configured to limit the line voltage to a predetermined voltage or less. The Earthquake Early warning signal, detects the pre-earthquake Seismic any one of claims 1 or 2, characterized in that on the basis of the signals obtained by analyzing the acoustic waveform of該地sound A security management method for the power supply system described in 1.

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