JP2017200407A - Remote ground line monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a remote ground line monitoring system capable of preventing a fault of a remote ground line monitoring device caused by a ground fault accident or the like by automatically connecting a remote ground line with a measurement part which measures ground resistance of the remote ground line, only in desired timing.SOLUTION: A remote ground line monitoring system comprises: a remote ground line monitoring device 2 for monitoring remote ground lines 52a and 52b connected with an earth potential rise maintenance device 51; and a management device 3 which is communicable with the remote ground line monitoring device 2. The remote ground line monitoring device 2 is accommodated in the earth potential rise maintenance device 51 and includes: a measurement part 5 for measuring ground resistance of the remote ground lines 52a and 52b; a connection part 6 for automatically connecting the remote ground lines 52a and 52b with the measurement part 5 only in desired timing; and a notice signal generation part 7 for generating a notice signal in a case where a measurement of the ground resistance measured by the measurement part 5 exceeds a preset setting. The management device 3 includes a warning generation part 10 which generates a warning in a case where the notice signal is received.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a far ground line monitoring system that monitors a far ground line connected to a ground potential increasing security device installed in a premises of an electric station, and in particular, only at a desired timing, The present invention relates to a remote grounding line monitoring system that detects grounding failure.

Conventionally, when a communication device such as a telephone or a telephone line is drawn into an ultra-high voltage electric station, it is desirable to install a ground potential increasing safety device when the ground potential increases when the power system is abnormal. This earth potential rising security device has a far end extended to a position several hundred (m) away from the electrical facility for the purpose of protecting communication equipment from fault currents that occur as the earth potential rises. The ground wire is connected. Therefore, in the ground potential rising security device, the fault current is released through this far ground line.
However, since the far ground line is attached to and extended from a road or a power pole in the mountains, there are cases where trees, falling rocks, vehicles, etc. come into contact with each other and are disconnected. In this case, the protection function for the communication device by the earth potential increasing safety device does not work, and there is a risk of damage or personal injury.
Moreover, since the disconnection detection function when the far ground line is disconnected is not provided, this disconnection cannot be detected except by visual inspection. Furthermore, even in the case of patrol, the disconnection cannot be detected sufficiently because the distant ground line is blocked by trees or accommodated in the pit.
Therefore, in order to solve such problems, in recent years, a technology related to a detection device and the like for detecting disconnection of the ground wire has been developed, and several inventions have already been disclosed in this regard.

Patent Document 1 discloses an invention relating to a ground detection device that notifies the disconnection of a ground wire under the name of “ground detection device”.
Hereinafter, the invention disclosed in Patent Document 1 will be described. The invention disclosed in Patent Document 1 is a ground detection device that detects the presence or absence of a break in a ground wire of a load device, and includes two primary windings to which an AC signal is applied and the case connected to the load device. A first transformer having a secondary winding connected in series to one of the ground wires, a primary winding connected in series with the primary winding of the first transformer, and an input signal change of the primary winding are extracted 2 Sensor means including a second transformer having a secondary winding and generating a sensor output corresponding to the output of the secondary winding of the second transformer, and reporting whether or not the ground wire is disconnected based on the sensor output of the sensor means And a notifying means for applying a commercial power source directly to the primary winding of the first transformer, while applying a constant voltage lower than the output voltage to the sensor means based on the output of the secondary winding of the second transformer. And a constant voltage generating means for generating the constant voltage And a level verification unit that directly inputs the rectified output of the secondary winding of the second transformer and generates the output when the voltage exceeds a predetermined threshold. It is characterized in that the notification means notifies the normality of the grounding line when an output is generated from.

  In the ground detection device having such a feature, when the ground wire is disconnected, the impedance of the primary winding of the first transformer becomes high, the input voltage of the primary winding of the second transformer becomes low, and the secondary The output from the winding is low. For this reason, the smooth output input to the window comparator also decreases, and when this smooth output becomes lower than the threshold value, the AC output of the window comparator stops. As a result, the light emitting diode is turned off, and the disconnection of the ground wire can be notified.

Next, Patent Document 2 discloses an invention relating to a cable inspection device that identifies the state of a core wire of a cable under the name “cable inspection device”.
The invention disclosed in Patent Document 2 includes an inspection resistance connector that is attached to a terminal end of a cable having a plurality of core wires with a built-in inspection resistor and connects the inspection resistance to each core wire, and is attached to the start end side of the cable A test power supply case with a test power supply connected in series to a test resistor through each core wire, and a conduction state when the current flows through the cable core wire through the test resistance provided in the test power supply case. A state determining means for determining when a current flows through the cable core without passing through a resistor as a short-circuited state and a disconnected state when a current does not flow through the cable core, and a state determining means provided in the inspection power supply case It is comprised from the alerting | reporting means which alert | reports a state, It is characterized by the above-mentioned.

In the cable inspection device having such a feature, since the inspection resistance connector is connected to the terminal end side of the cable and the inspection power supply case is connected to the start end side, the state of the core wire is inspected. Even so, it can be easily inspected whether the core wire is normally connected, and workability can be improved.
In addition, since the selection switch for selectively switching the core wire connected to the variable resistor is provided between the cable start end side and the variable resistor, the operator can select the switch even when the cable has many core wires. It is possible to inspect each core wire in order simply by operating and to easily inspect whether or not many core wires are normally connected.

Japanese Patent No. 3389001 JP 2001-165986 A

However, in the invention disclosed in Patent Document 1, it is considered that the sensor means is always connected to one of the ground lines and functions in a specific voltage range.
However, in the earth potential rise safety device and high-voltage power receiving equipment installed in an ultra-high voltage (220,000 volts or more) electric station, the voltage generated due to a ground fault or lightning damage is tens of thousands of volts or more. Therefore, if the sensor means and the ground wire are always connected, there is a problem that the sensor means itself may be damaged.

Furthermore, in the invention disclosed in Patent Document 2, the selection switch is manually switched in the inspection order of each core wire.
However, since it is necessary to repeatedly detect the disconnection of the far ground line or the like, manual switching has a problem that the burden on the operator is large and not realistic.

  The present invention has been made in response to such a conventional situation. Only at a desired timing, a ground fault is established by automatically connecting a far ground wire and a measurement unit for measuring the ground resistance. An object of the present invention is to provide a far ground line monitoring system capable of preventing a failure of the far ground line monitoring device due to an accident or the like.

  In order to achieve the above object, a first invention provides a far ground line monitoring device for monitoring a far ground line connected to a ground potential increasing security device installed in a premises of an electric station, and the far ground line monitoring device. The remote ground line monitoring device is housed inside the housing of the ground potential rising security device and measures the ground resistance of the far ground wire; A notification signal is generated when the measured value of the ground resistance measured by the connecting unit that automatically connects the remote grounding wire and the measuring unit exceeds the preset value only at the desired timing The management device is provided outside the premises of the electric station, and includes a warning generation unit that generates a warning when the notification signal is received.

In the invention with such a configuration, the ground potential increasing security device is installed to protect workers, communication cables, and communication equipment when the ground potential of the electric station increases due to a ground fault in the transmission line. . In addition, the far ground line is installed in such a manner that one end thereof is connected to the ground potential increasing security device and the other end is in contact with the ground so as not to cause a potential difference between the communication device or the like and the ground.
Further, for example, when the far ground line becomes poorly grounded, the measured value of the ground resistance tends to increase. On the other hand, when the far ground line is completely disconnected, this measured value is infinite. Therefore, the case where the measured value of the grounding resistance exceeds a preset value indicates that the far grounding wire is poorly grounded or disconnected.
Further, the communication means may be either a wireless communication means or a wired communication means. Moreover, a switch and a switching relay are used for a connection part according to the number of distant ground lines.

In the invention with the above configuration, when the notification signal is received, the management device is provided with an alarm generation unit that generates an alarm, so that the disconnection or the like of the far ground line is reliably notified.
Further, since the connection unit automatically connects the far ground line and the measurement unit only at a desired timing, the far ground line and the measurement unit are not always connected, and are connected only when necessary. Therefore, even when a sudden ground fault or the like occurs, it is possible to prevent the remote ground line monitoring device itself from being damaged. The automatic connection described above is realized, for example, by setting a timer with a timer or a timer with a timer as a connection unit, and commands the connection unit to make such a connection. The control unit may be realized by being provided independently of the connection unit.

Next, a second invention is characterized in that, in the first invention, a plurality of far ground wires are installed, and the connecting portion connects any of the plurality of far ground wires to the measuring portion.
In the invention having such a configuration, the plurality of far ground wires and the measurement unit are not always connected, and only one of the far ground wires is measured for ground resistance when necessary. Therefore, even if the number of far ground lines increases, a failure of the far ground line monitoring device due to a ground fault is prevented.

Furthermore, a third invention is characterized in that, in the first or second invention, a connection control unit that transmits a connection signal instructing the connection unit to connect the far ground line and the measurement unit is provided.
In the invention with such a configuration, in addition to the operation of the first or second invention, the ground resistance of the far ground line is measured regularly or temporarily according to the connection signal of the control unit.
The control unit is provided in either the far ground line monitoring device or the management device, or both.

A fourth invention is characterized in that, in any one of the first to third inventions, the timing is the same time every day.
In the invention having such a configuration, in addition to the operation of any one of the first to third inventions, the ground resistance of the far ground line is automatically measured at the same time every day.
Therefore, it takes no time to measure the grounding resistance and never forgets to perform the measurement, so that the disconnection of the far grounding line can be grasped stably.

According to the first invention, it is possible to reliably detect disconnection or the like of the far ground wire outside the electric station. Moreover, the disconnection can be detected even when the far grounding line is blocked by trees and the far grounding line cannot be seen. Therefore, it is possible to prevent a failure of a communication device or the like installed on the premises of the electric station.
In addition, the remote grounding wire and the measuring unit are connected to each other only when necessary, and the remote grounding wire monitoring device itself is prevented from malfunctioning due to a ground fault or the like, thus improving the operation accuracy of the ground potential rising safety device. be able to.

  According to the second invention, in addition to the effects of the first invention, even when the number of far ground wires increases, it is possible to reliably prevent a failure of a communication device or the like installed in the premises of the electric station. be able to.

According to the third invention, in addition to the effects of the first or second invention, since the ground resistance of the far ground line is measured regularly or temporarily, particularly in the latter, the ground resistance can be measured in real time. it can.
In addition, when the control unit is installed in the management device, it is possible to measure the ground resistance by commanding from this management device, so that the operator can easily measure the ground resistance without moving to the remote ground line monitoring device. Can be started.

  According to the fourth invention, in addition to the effects of any one of the first to third inventions, since the ground resistance of the far ground wire is automatically and stably measured, the maintenance of the ground potential rising safety device is maintained. Suitable for management.

It is a block diagram of the distant ground line monitoring system which concerns on an Example. It is a block diagram which shows the flow of a signal of the distant ground line monitoring system which concerns on an Example. It is a block diagram of the far ground line monitoring system which concerns on the 1st modification of an Example. It is a block diagram which shows the flow of a signal of the far ground line monitoring system which concerns on the 1st modification of an Example. It is a block diagram of the far ground line monitoring system which concerns on the 2nd modification of an Example. It is a block diagram of the far ground line monitoring system which concerns on the 3rd modification of an Example.

The remote ground line monitoring system of the Example which concerns on embodiment of this invention is demonstrated in detail using FIG.1 and FIG.2. FIG. 1 is a configuration diagram of a remote ground line monitoring system according to an embodiment.
As shown in FIG. 1, the far ground line monitoring system 1 according to the present embodiment monitors far ground lines 52 a and 52 b connected to a ground potential increasing security device 51 installed in the premises 50 a of the electric station 50. The remote ground line monitoring device 2 and the management device 3 capable of communicating with the remote ground line monitoring device 2 via the communication means 4a and 4b.
In addition, the earth potential raising safety device 51 has an indoor protector 53 already installed, and a fault current generated by a ground fault or a lightning strike is caused by connecting the existing communication device 54a and the communication cable 54b connected thereto. Protect from. More specifically, the indoor protector 53 is a magnet circuit breaker, and operates when a potential difference between the communication device 54a or the communication cable 54b and the far ground wires 52a and 52b occurs due to a ground fault or the like. As a result, the failure current is prevented from flowing back to the communication device 54a and the like, and the damage is avoided. The difference between the far ground lines 52a and 52b is the location of the tip extending from the ground potential increasing security device 51.

  However, when the far ground wires 52a and 52b are disconnected, the indoor protector 53 does not operate, so that it is not possible to prevent the return of the fault current. Therefore, in the present application, by introducing the far grounding line monitoring system 1 to the ground potential increasing safety device 51, the disconnection of the far grounding lines 52a and 52b is reliably detected, and the operation of the indoor protector 53 is avoided. Thus, the communication device 54a and the like are prevented from being damaged.

The far ground line monitoring device 2 is housed inside the housing 51a of the ground potential rising security device 51, and measures the grounding resistance of the plurality of far ground wires 52a and 52b, respectively, and only at a desired timing. When the measured value of the ground resistance measured by the measuring unit 5 exceeds the preset value, the notification signal S is automatically connected to the remote ground lines 52a and 52b and the measuring unit 5 respectively. ₇ (see FIG. 2) is provided.
Among these, for example, a switching relay with a timer is used as the connection unit 6, and the measurement unit 5 is connected to one of the far ground lines 52 a and 52 b. In addition, the timer of the connection unit 6 is set so that the connection timing is the same time every day. That is, at the same time every day, after the remote ground wire 52a and the measuring unit 5 are connected and the ground resistance of the remote ground wire 52a is measured, the switching relay is activated to connect the remote ground wire 52b and the measuring unit 5; The ground resistance of the far ground line 52b is measured. The notification signal generator 7 is a discriminator that discriminates only input signals having a certain strength or more when, for example, an input signal is input.
The far ground line monitoring device 2 controls the storage unit 8 that stores the two types of measurement values measured by the measurement unit 5, the communication unit 4 a, the measurement unit 5, the notification signal generation unit 7, and the storage unit 8. And a communication means 4a.

The management device 3 is installed in off-premise 50b of the substation 50, when receiving the notification signal S _7, provided with a warning generator 10 for generating an alarm, the communication unit 4a capable of wireless communication with the communication unit 4b Is built-in.

Next, the signal flow of the remote ground line monitoring system according to the embodiment will be described in more detail with reference to FIG. FIG. 2 is a configuration diagram illustrating a signal flow of the remote ground line monitoring system according to the embodiment. In addition, about the component shown in FIG. 1, the same code | symbol is attached | subjected also in FIG. 2, and the description is abbreviate | omitted.
As shown in FIG. 2, one of the far ground wires 52 a and 52 b and the measurement unit 5 are alternately connected by the operation of the connection unit 6, and the measurement value of the ground resistance is measured by the measurement unit 5. The measurement value is output from the measurement unit 5 as a measurement value signal S ₅ and input to the control unit 9.
Measurement signal S ₅ inputted to the control unit 9 is associated with the date and time by the control unit 9. The measurement value signal S ₅ ′ associated with the date and time is stored in the storage unit 8 and is output to the notification signal generation unit 7. Then, when the measured value signal S ₅ ′ exceeds the preset set value in the notification signal generation unit 7 and becomes larger than this set value, that is, the far ground lines 52a and 52b become poor grounding. In the case of failure or disconnection, the notification signal S ₇ is output to the communication unit 4 a and stored in the storage unit 8. Incidentally, the intensity of the notification signal S _7, in addition to being set to a constant intensity may be set so as to strength and proportional measurement signal S _5.

Next, the communication unit 4a in accordance with a notification signal S ₇ known wireless communication standards, wirelessly transmits to the communication unit 4b. Communication means 4b outputs a notification signal S ₇ received the alarm unit 10.
Alarm unit 10, for example lighting fixture and speakers are used, notifies the signal S ₇ is input, generates an alarm such as light or sound.
In addition, the measurement value signal S ₅ ′ and the notification signal S ₇ stored in the storage unit 8 may be output to a storage medium (not shown) such as a USB memory.

In the far ground line monitoring system 1 having the above-described configuration, when the far ground lines 52a and 52b are poorly grounded or disconnected, an alarm is generated by the alarm generation unit 10, so that the far ground lines 52a and 52b Disconnection and grounding failure will be reported reliably.
Further, since the connection unit 6 automatically connects the far ground lines 52a and 52b and the measurement unit 5 only at the same time every day, the far ground lines 52a and 52b and the measurement unit 5 are not always connected. Absent. Therefore, even when a sudden ground fault or the like occurs, it is possible to prevent the distant ground line monitoring device 2 itself from failing. In addition, since the above automatic connection is performed by a switching relay, even when a plurality of far ground lines 52a and 52b are connected, switching and measurement of the ground resistance are accurately performed for these. .
Furthermore, since the grounding resistance of the far ground wires 52a and 52b is automatically and sequentially measured at the same time every day by the switching relay with a timer that is the connection unit 6, the labor of manual measurement by the operator can be saved, Since it does not take time to measure the grounding resistance and never forgets to measure it, the disconnection of the far grounding wires 52a and 52b can be grasped stably.

As described above, according to the remote ground line monitoring system 1 according to the embodiment, since the alarm is generated by the alarm generation unit 10, the disconnection of the remote ground lines 52 a and 52 b and the like at the off-site 50 b of the electric station 50 is performed. It can be detected reliably. In addition, the disconnection can be detected even when the far ground lines 52a and 52b cannot be visually observed because the far ground lines 52a and 52b are blocked by trees or accommodated in the pits.
In addition, the far ground lines 52a and 52b and the measuring unit 5 are not always connected, and even when a sudden ground fault or the like occurs, it is possible to prevent the far ground line monitoring device 2 itself from failing. It is possible to improve the operation accuracy of the security device 51, and to improve the reliability thereof.

  Furthermore, since the switching of the far ground lines 52a and 52b and the measurement of the ground resistance are accurately performed by the connection unit 6, even if a new far ground line 52a is added to the far ground lines 52a and 52b. In addition, it is possible to reliably prevent a failure of the communication device 54a and the like installed in the premises 50a of the electric station 50. Moreover, since the connection part 6 is a relay with a timer, the timing which connects the far ground lines 52a and 52b and the measurement part 5 can be changed freely by changing the setting of the timer.

Next, a far ground line monitoring system according to a first modification of the embodiment will be described in detail. FIG. 3 is a configuration diagram of a far ground line monitoring system according to a first modification of the embodiment.
As shown in FIG. 3, the far ground line monitoring system 1a according to the first modification of the embodiment includes a far ground line monitoring device 2a and a management device 3a.
The far ground line monitoring device 2 a includes a connection control unit 9 a that transmits a connection signal S _{9 a} (see FIG. 4) that instructs the connection unit 6 to connect the far ground lines 52 a and 52 b and the measurement unit 5. The connection control unit 9a constitutes a part of the control unit 9, and transmits a connection signal _S9a according to the timer function of the control unit 9. In this case, the connection unit 6 may be a switching relay that does not have a timer function.
Management apparatus 3a, when the communication unit 4b receives the notification signal S _{7 (see} FIG. 2), a display unit 11 to immediately display it.
The configurations of the far ground line monitoring system 1a, the far ground line monitoring device 2a, and the management device 3a other than those described above are the same as those of the far ground line monitoring system 1, the far ground line monitoring device 2 and the management device 3, respectively.

Subsequently, the signal flow of the far ground line monitoring system according to the first modification of the embodiment will be described in more detail with reference to FIG. FIG. 4 is a configuration diagram illustrating a signal flow of the remote ground line monitoring system according to the modification of the embodiment. The constituent elements shown in FIGS. 1 to 3 are denoted by the same reference numerals in FIG. 4 and the description thereof is omitted.
As shown in FIG. 4, the connection signal _{S 9a} of the connection control unit 9a, distant ground line 52a, the measurement section 5 and any of 52b are connected. Thereafter, the flow of the same signal as far ground line monitoring system 1, the communication unit 4b receives the notification signal S _7. Communication means 4b transmits a notification signal S ₇ received to the alarm generating section 10 and the display unit 11.
Display unit 11 is, for example, a monitor screen, the characters and symbols notification signal S _7, the blinking of light, notifying to the surroundings. In addition, when the strength of the notification signal S ₇ is proportional to the strength of the measurement value signal S ₅ , a numerical value display or a graph display is performed on the display unit 11 so that the strength of the notification signal S ₇ can be understood. May be.
The signal flow in the far ground line monitoring system 1a other than the above is the same as the signal flow in the far ground line monitoring system 1.

As described above, according to the first distant ground line monitoring system 1a according to a modification of the embodiment, in addition to the effect of a distant ground line monitoring system 1, the notification signal S ₇ letters and symbols to the management apparatus 3a In addition, since the display unit 11 that can be displayed as a graph or the like is provided, the amount of information to be notified is larger than in the case where an alarm such as light is generated, and the situation of the remote grounding line monitoring device 2 is grasped in detail. be able to.

Further, a far ground line monitoring system according to a second modification of the embodiment will be described in detail with reference to FIG. FIG. 5 is a configuration diagram of a far ground line monitoring system according to a second modification of the embodiment. 1 to 4 are denoted by the same reference numerals in FIG. 5 and description thereof is omitted.
As shown in FIG. 5, the far ground line monitoring system 1b according to the second modification of the embodiment includes a far ground line monitoring device 2 and a management device 3b that constitute the embodiment. The management device 3b includes a connection control unit 9a and a control unit 12 that is partly configured by the connection control unit 9a. Among these, the connection control unit 9 a outputs the connection signal S _{9 a} according to the timer function of the control unit 12.
Other configurations of the far ground line monitoring system 1b and the management device 3b are the same as those of the far ground line monitoring system 1 and the management device 3, respectively.
Therefore, the signal flow in the far ground line monitoring system 1b is as follows. The connection signal S _9a generated from the connection control unit 9a is transmitted to the connection unit 6 via the communication means 4b and 4a and the control unit 9 to operate it. The subsequent signal flow is the same as that of the far ground line monitoring system 1.

  As described above, according to the far ground line monitoring system 1b according to the second modification of the embodiment, in addition to the effects of the far ground line monitoring system 1, the connection control unit 9a is installed in the management device 3b. Therefore, it is possible to measure the ground resistance of the far ground lines 52a and 52b in real time by commanding from the management device 3b. Therefore, the measurement of the ground resistance can be easily started without the operator moving to the far ground line monitoring device 2.

A far ground line monitoring system according to a third modification of the embodiment will be described in detail with reference to FIG. FIG. 6 is a configuration diagram of a far ground line monitoring system according to a third modification of the embodiment. The components shown in FIGS. 1 to 5 are denoted by the same reference numerals in FIG. 6 and the description thereof is omitted.
As shown in FIG. 6, a far ground line monitoring system 1c according to a third modification of the embodiment includes a far ground line monitoring device 2a and a management device 3c. The management device 3c is input to the management device 3 of the embodiment from the connection control unit 9a, the display unit 11, the input unit 13 for inputting a signal for generating the connection signal _S9a , and the input unit 13. A control unit 12 is provided to instruct the connection control unit 9a to generate a connection signal _S9a by a signal. That is, the connection control unit 9a is provided in both the far ground line monitoring device 2a and the management device 3c.
The configuration of the far ground line monitoring system 1c other than the above is the same as that of the far ground line monitoring system 1.

Therefore, the signal flow in the far ground line monitoring system 1c is as follows. The connection signal S _9a generated from the connection control unit 9a provided in the far ground line monitoring device 2a is transmitted to the connection unit 6 through the control unit 9 to activate it. Further, the connection signal S _9a generated from the connection control unit 9a provided in the management device 3c is transmitted to the connection unit 6 via the communication means 4b and 4a and the control unit 9 to operate it. The subsequent signal flow is the same as that of the far ground line monitoring system 1.

  As described above, according to the far ground line monitoring system 1c according to the third modification of the embodiment, in addition to the effects of the far ground line monitoring system 1, the connection control unit 9a includes the far ground line monitoring device 2a. And the management device 3c, the measurement of the ground resistance of the far ground wires 52a and 52b can be started in any of these devices.

  The structure of the far ground line monitoring system 1, 1a to 1c of the present invention is not limited to that shown in the embodiments. For example, in the connection between the far ground lines 52a and 52b and the measurement unit 5, the far ground lines 52a and 52b are continuously switched without time, and the far ground line 52a and the far ground line 52b are measured. It may be performed after a certain period of time. Further, the far ground line 52b of the far ground lines 52a and 52b may not be provided. In this case, the connection unit 6 uses a switch with a timer instead of the switching relay with a timer. Further, the communication means 4a and 4b may be wired communication means such as a LAN cable. In addition, the setting value in the notification signal generation unit 7 may be set to the notification signal generation unit 7 by the control unit 9 or the control unit 12 as a value input from the input unit 13.

  INDUSTRIAL APPLICABILITY The present invention can be used as a far ground line monitoring system that can prevent a failure of the far ground line monitoring device due to a ground fault or the like.

  DESCRIPTION OF SYMBOLS 1,1a-1c ... Distant ground line monitoring system 2, 2a ... Distant ground line monitoring apparatus 3, 3a-3c ... Management apparatus 4a, 4b ... Communication means 5 ... Measuring part 6 ... Connection part 7 ... Notification signal generation part 8 ... Storage unit 9 ... Control unit 9a ... Connection control unit 10 ... Alarm generating unit 11 ... Display unit 12 ... Control unit 13 ... Input unit 50 ... Electrical station 50a ... Inside 50b ... Outside 51 ... Safety device 51a for increasing ground potential 51a ... Case 52a, 52b ... Distant ground wire 53 ... Indoor protector 54a ... Communication equipment 54b ... Communication cable

Claims (4)

A remote ground line monitoring device for monitoring a remote ground line connected to a ground potential rising security device installed in the premises of the electric station, a management device capable of communicating via the remote ground line monitoring device and communication means, Consists of
The far ground line monitoring device is housed in a housing of the ground potential increasing security device,
A measurement unit for measuring the ground resistance of the far ground wire;
Only at a desired timing, a connection part that automatically connects the far ground line and the measurement part,
A notification signal generating unit that generates a notification signal when the measured value of the ground resistance measured by the measuring unit exceeds a preset setting value,
The far ground line monitoring system, wherein the management device includes an alarm generation unit that is installed outside the premises of the electric station and generates an alarm when the notification signal is received. A plurality of the far ground wires are installed,
The far ground line monitoring system according to claim 1, wherein the connection unit connects any of the plurality of far ground lines to the measurement unit.   The far ground line monitoring system according to claim 1, further comprising a connection control unit that transmits a connection signal instructing the connection unit to connect the far ground line and the measurement unit.   The far ground line monitoring system according to any one of claims 1 to 3, wherein the timing is the same time every day.

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