JP2003284236A - Leakage diagnoser - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a leakage diagnoser which can easily and quickly specify the load having caused leakage on the occurrence of leakage, even in a power supply system where the number of pieces of load connected to a power distributing facility becomes massive. <P>SOLUTION: In this system which supplies power to each load via a power distributing means constituting a hierarchical structure from a transformer 1 for power distribution, a leakage measuring annunciator 11, which informs a terminal device 1 of occurrence of a leakage current at a certain value or over, distributing cable specifiers 12a and 12b, which are provided in the distributing means 2 and 3 in each layer excluding the uppermost layer and specify and indicate the distributing cable concerned with occurrence of each leakage, and a load specifier 13, which specifies and indicates the load with occurrence of leakage from among the load 5a connected to each distributing cable 4a of the distributing means 4 in the lowermost layer, are provided. Even if there are many power distributing means in many layers, this leakage diagnoser can specify the load with leakage occurrence, tracing the shortest power distributing means. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric power supply system for supplying electric power from a substation to respective loads via a distribution transformer and a plurality of hierarchical distribution / distribution means. The present invention relates to an electric leakage diagnostic device that identifies an electric leakage point that is a cause of the leakage measurement.

[0002]

2. Description of the Related Art In a power supply system for supplying electric power to various facilities and equipment used inside and outside buildings such as factories and research laboratories, due to deterioration of facilities and equipment, changes in operating environment, erroneous operation, etc. Electric leakage often occurs.
When an electric leakage occurs, there is a risk of causing a fire or an electric shock accident, and there is also a risk of hindering normal operation of equipment and devices. Therefore, it is extremely important to promptly detect such leakage and specify the leakage location (load of equipment, equipment, etc.) for leakage prevention and restoration to a normal state.

Therefore, conventionally, a main circuit breaker inserted in the main line and a branch breaker inserted in each of the branch circuits branched from the main line are provided with an earth leakage detection circuit, and the branch breaker is provided with an indicator of the occurrence of electric leakage, and the main breaker is provided. There has been considered a leakage warning system in which the output of the leakage detection circuit is used as an alarm output to enable the occurrence of leakage and the location of the leakage occurrence (see Japanese Patent Application Laid-Open No. 4-161020).

[0004]

However, the above-mentioned prior art has the following problems. In other words, the demand for electric power in factories in recent years has become large-scale and complicated, and the power supply system used there is also a plurality of power supply systems after the power (voltage) from the substation has been stepped down by the distribution transformer. It is becoming large-scale and complicated as it is supplied to the load of equipments, devices, etc. via the distribution / distribution equipment having the hierarchical structure of.

Therefore, it is not rare that the number of branch circuits based on one trunk line (main circuit) eventually becomes several tens of circuits, and the total number of branch circuits based on all trunk lines is several times the above several tens of circuits. There will be a branch circuit that goes up to. For this reason, there has been a problem that it takes a lot of time and effort to find the leakage point by looking at the display provided on each branch breaker.

Further, in the prior art, it is possible to know which of the branch circuits out of a plurality of branch circuits actually has the leakage, and which load connected to the branch circuit the leakage has occurred. There wasn't. For this reason, after knowing which branch circuit the leakage has occurred, the load connected to the branch circuit is examined.

However, in the situation where the power supply system is large-scaled and complicated as described above, the total number of loads connected to the distribution / distribution equipment of the lowest layer reaches hundreds or thousands. . Therefore, even within a limited range of one branch circuit among a plurality of branch circuits, it is extremely difficult to quickly identify which load in the branch circuit is causing the leakage. There was a problem.

Further, in the prior art, when there are a plurality of loads causing leakage or a plurality of loads suspected of occurrence of leakage, it is inevitable to artificially determine which of the loads is dangerous. However, there was also a problem that the result of the judgment was different depending on the observer. In addition, the urgency of measures such as leakage prevention often differs according to the risk of leakage that can be determined from the waveform of leakage current, but the prior art did not consider these points at all. .

The present invention has been made in order to solve the above-mentioned problems of the prior art. Even in a power supply system in which the total number of loads connected to distribution / distribution equipment becomes enormous, when a leakage occurs. An object of the present invention is to provide an earth leakage diagnostic device that can easily and quickly identify the load (leakage occurring load) that is the cause.

Further, according to the present invention, in the case where there are a plurality of loads that generate a leakage current or a load that is suspected to generate a leakage current, the leakage diagnosis can appropriately perform the subsequent treatment by eliminating the variation in the judgment result by the monitor. The purpose is to provide a device.

Further, according to the present invention, an existing LAN (local area network) can be used also as a communication path between an earth leakage measuring / notifying device and a terminal device, and a general-purpose personal computer or workstation as a terminal device can be used. It is an object to provide a leakage diagnosis device that can be used.

[0012]

In order to achieve the above object, the invention according to claim 1 distributes electric power from a substation through a distribution transformer in a plurality of hierarchical structures. In the leakage diagnostic device in the power supply system for supplying to each load via the means, one or more of the desired occurrence of leakage when the leakage current of a predetermined value or more is measured by the distribution transformer. An earth leakage measuring / informing device for informing the terminal device installed at a location, and the distribution / distribution means of each layer except the lowest layer of the hierarchical structure are provided corresponding to each distribution line of the distribution / distribution means. Identify the distribution line related to the leakage occurrence by comparing the waveform of the current flowing and the waveform of the leakage current,
A distribution line identifying device that displays the result on a display device, compares the waveform of the current flowing through each distribution line in the distribution / distribution means of the lowest layer of the hierarchical structure with the waveform of the leakage current, and distributes each distribution line. A load that has leaked is specified from the connected loads, or is connected to the distribution line in the distribution / distribution means of the lowest layer, and a plurality of loads are turned on at preset timings.
A load identifying device that identifies a load in which a leakage has occurred by comparing the control timing of each load by the load group control device that performs ON / OFF control with the waveform of the leakage current, and displays the result on a display device. Characterize.

According to a second aspect of the present invention, in the leakage diagnosis apparatus according to the first aspect, a leakage recording database for recording past leakage occurrences for each load is attached, and the load identifying device is used for the leakage recording. The feature is to identify the load that has caused the leakage by also referring to the data recorded in the database.

The invention according to claim 3 is the invention according to claim 1 or 2.
In the electric leakage diagnostic device described in (1), when there are a plurality of loads that can be specified, a high-risk load determined from the waveform of the current flowing through each of the loads is specified as the load that has generated the electric leakage.

The invention according to claim 4 is the leakage diagnostic apparatus according to claim 1, 2 or 3, characterized in that the notification to the terminal device by the leakage measuring / notifying device is performed by electronic mail.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a leakage diagnostic device according to the present invention. As shown in the figure, the device of the present invention distributes electric power from a substation through a distribution transformer 1 to form a plurality of hierarchical structures, here three hierarchical structures.
The present invention is applied to a power distribution unit, that is, a power supply system that supplies each load 5a through a low-voltage large-capacity power distribution device (load center) 2, a power distribution board 3, and a branch circuit 4.

In this case, the distribution transformer 1 receives high-voltage power from a substation in a business office, steps it down to 400 V, 200 V or 100 V, and supplies it to a low-voltage large-capacity distribution device (hereinafter abbreviated as a distribution device) 2. It is something to send. Power distribution device 2
Is a device that distributes the stepped-down power supply to a plurality of low-voltage trunk lines (distribution lines) 2a, and a breaker 2b is inserted in each low-voltage trunk line 2a.

The distribution board 3 is a distribution board for branching the low-voltage main line 2a into a plurality of distribution lines 3a, and breakers 3b are inserted in each distribution line 3a. In the illustrated example, the distribution board 3 is connected to only one low-voltage main line 2a, but in reality, the distribution board 3 is connected to each low-voltage main line 2a.

The branch circuit 4 further branches the distribution line 3a into a plurality of distribution lines 4a, and supplies power from the distribution line 3a to each load 5
a or a circuit for supplying to the load group 5. In the illustrated example, the branch circuit 4 is connected to only one distribution line 3a, but actually, the branch circuit 4 is connected to each distribution line 4a. Further, in the illustrated branch circuit 4, one load 5a is provided on the leftmost distribution line 4a and a load group 5 is provided on the rightmost distribution line 4a.
Although an example in which (a plurality of loads 5a ...) Is connected is shown, the load 5a or the load group 5 is actually connected to each distribution line 4a.
Are connected. Further, in the illustrated example, the plurality of loads 5a ... Which constitute the load group 5 are turned on at preset timings.
The case where the above-mentioned distribution line 4a is connected to the load driving power supply terminal of the load group control device (sequencer) 6 for performing ON / OFF control is shown. The load 5a includes a heater, a solenoid valve, a motor, a lighting device, or the like.

According to the present invention, in such a power supply system, a leakage measuring / informing device 11 and a distribution line identifying device 12 are provided.
And a load identifying device 13. Here, the earth leakage measuring / informing device 11 is a desired department such as a manufacturing department or a construction department when the leakage current of the distribution transformer 1 is more than a predetermined allowable value and a leakage current is measured. And a device for notifying the terminal devices 21 respectively installed in the production engineering department. The earth leakage measurement / informing device 11 is installed, for example, at the installation location of the distribution transformer 1.

Notification that the leakage current measuring / informing device 11 has measured the leakage current exceeding the allowable value (notification of leakage current)
Measures the ground wire current of the distribution transformer 1 by the leakage measuring unit 11a equipped with a current detector, and monitors / informs the monitoring unit 11b.
When it is determined that the measured value exceeds the set value, the measurement is performed toward the terminal device 21 installed in each department.

Monitoring / informing section 11b and each terminal device 21
Is a general-purpose personal computer (hereinafter, referred to as a personal computer), a workstation, or the like, and is composed of a personal computer, and they are connected to each other via a LAN 22, and the leakage current is notified by electronic mail via the LAN 22. Is configured.

A LAN 22 is often constructed on the premises of a large-scale factory or the like, but in the illustrated example, the LAN 22 is constructed.
Is also used as a communication path between the leakage measuring / informing device 11 (monitoring / informing unit 11b) and each terminal device 22, and by using a general-purpose personal computer for the monitoring / informing unit 11b and each terminal device 21, the equipment cost is reduced. Is being pursued. The monitor / notification unit 11b is also used as a personal computer having a server function for monitoring and managing various energy sources other than electricity, such as gas and air.

The distribution line identifying device 12 is provided corresponding to the distribution / distribution means of each layer other than the lowermost layer of the distribution / distribution means having a hierarchical structure, here, the distribution device 2 and the distribution board 3. In the illustrated example, the distribution line identifying device 12 provided corresponding to the power distribution device 2 is shown with a subscript a, and the distribution line identifying device 12 provided corresponding to the distribution board 3 is shown with a subscript b. The distribution line identifying devices 12a and 12b are each composed of a general-purpose personal computer, a workstation, or the like, here, a personal computer.

The distribution line identifying device 12a provided corresponding to the distribution device 2 compares the waveform of the current flowing through each distribution line (low-voltage trunk line) 2a in the distribution device 2 with the waveform of the leakage current and detects a leakage. This is a device for identifying the distribution line 2a and displaying the result on a display device (not shown). Distribution line 2
The waveform of the energizing current of a is given from the clamp meter 32, and the waveform of the leakage current is given from the clamp meter 31.

The distribution line identifying device 12b provided corresponding to the distribution board 3 compares the waveform of the current flowing through each distribution line 3a in the distribution board 3 with the waveform of the leakage current to distribute the leakage current. This is a device for identifying the electric wire 3a and displaying the result on a display device (not shown). The waveform of the current flowing through the distribution line 3a is given from the clamp meter 33, and the waveform of the leakage current is given from the clamp meter 31.

The load identifying device 13 has a hierarchical structure.
The distribution / distribution means in the lowest layer of the distribution means, in the illustrated example, the waveform of the current flowing through the distribution line 4a in the branch circuit 4 (current flowing through the load 5a) and the waveform of the leakage current are compared to each other to cause a load that has leaked. This is a device for identifying 5a. Further, the load identifying device 13 turns on / off the load group 5 at a preset timing.
O of each load 5a by the load group control device 6 for OFF control
Load 5a in which leakage occurred by comparing N / OFF timing and leakage current waveform (rising / falling timing)
Is specified and the result is displayed on a display device (not shown). The load identifying device 13 is a general-purpose personal computer or workstation, such as a personal computer in this case.

The waveform of the current flowing through the distribution line 4a is given from the clamp meter 34, and the waveform of the leakage current is given from the clamp meter 31. In addition, each load 5 by the load group control device 6
The ON / OFF timing of a is obtained by the load identifying device 13 reading from a load group control program (not shown) stored in the load group controller 6.

It should be noted that between the clamp meter 31 and the distribution line specifying devices 12a and 12b and the load specifying device 13, between each clamp meter 32 and the distribution line specifying device 12a, each clamp meter 33 and the distribution line specifying device 12b. Communication between the clamp meter 34 and the load identifying device 13,
It is performed wirelessly here.

Next, the operation of the above-mentioned device of the present invention will be described. Now, when the ground wire current of the distribution transformer 1, that is, the leakage current I1 exceeds an allowable value while the power supply system shown in FIG. 1 is in operation, the leakage measurement / informing device 11 detects it and the An electronic mail describing that an electric leakage has occurred is sent to the terminal device 21 via the LAN 22. As a result, the supervisor of each department knows the occurrence of the electric leakage (the occurrence of the electric leakage current I1 exceeding the allowable value).

At this time, the leakage current waveform is the clamp meter 3
1 to the distribution line identifying device 12a. The distribution line identifying device 12a sequentially compares the waveform of the current flowing through each low voltage main line (distribution line) 2a of the distribution device 2 detected by the clamp meter 32 in synchronization with the above leakage current waveform, and the waveforms match. The distribution line 2a through which the current is flowing is specified, and the result is displayed on the display device. Here, the second distribution line 2a from the left in the figure is specified, and that fact is displayed on the display device of the distribution line specifying device 12a. Therefore, the observer looks at the display device of the distribution line identifying device 12a and immediately identifies the specified distribution line, that is, the illustrated distribution line without stopping at each distribution line identifying device 12b (not shown) unrelated to the occurrence of leakage. It is possible to go straight to the installation location of the wire identification device 12b.

During this time, the leakage current waveform from the clamp meter 31 is also given to the illustrated distribution line identifying device 12b. The distribution line identifying device 12b sequentially compares the waveforms of the currents flowing through the distribution lines 3a of the distribution device 3 detected by the clamp meter 33 in synchronization with the leakage current waveforms, and finds that the currents having the same waveforms are matched. Distribution line 3 flowing
a is specified, and the comparison result is displayed on the display device.

The distribution line identifying device 12b and the clamp meter 33 for each distribution line 3a are similarly provided for the other distribution lines 2a in the distribution device 2, and the display devices of those distribution line identifying devices 12b are the same. Illustrated distribution line identification device 1
Similar to the case of 2b, the comparison result of the conduction current waveform and the leakage current waveform of each distribution line is displayed. Here, since the power distribution device 3 related to the illustrated distribution line identifying device 12b is involved in the occurrence of leakage, it corresponds to a display device of the distribution line identifying device 12b (not shown) other than the illustrated distribution line identifying device 12b. It says that there is no distribution line.

In the illustrated distribution line identifying device 12b, the fourth distribution line 3a from the left in the figure is identified, and the fact is displayed on the display device of the distribution line identifying device 12b. Therefore, the observer looks at the display device of the distribution line identifying device 12b and sees each load identifying device 13 unrelated to the occurrence of leakage.
It is possible to immediately go directly to a specific installation location of the load identifying device 13, that is, the illustrated installation location, without stopping by (not shown).

During this time, the leakage current waveform from the clamp meter 31 is also given to the illustrated load identifying device 13. The load identifying device 13 sequentially compares the waveforms of the currents flowing through the respective distribution lines 4a of the branch circuit 4 detected by the clamp meters 34 in synchronization with the leakage current waveforms, and the currents having the same waveforms flow. The distribution line 4a that is in use is specified, and the comparison result is displayed on the display device.

The load identifying device 13 and the clamp meter 34 for each distribution line 4a are connected to other distribution lines 3 in the distribution device 3.
a is similarly provided, and the display device of the load identifying device 13 displays the comparison result of the conduction current waveform and the leakage current waveform of each distribution line 3a as in the case of the illustrated load identifying device 13. It Here, since the branch circuit 4 relating to the illustrated load identifying device 13 is involved in the occurrence of electric leakage, the display devices of the load identifying devices 13 other than the illustrated branch circuit 4 indicate that there is no corresponding distribution line. There is.

In the illustrated load identifying device 13, the distribution line 4a at the right end in the figure is identified, and that fact is displayed on the display device of the load identifying device 13. Therefore,
The observer looks at the display device of the load identifying device 13 and immediately identifies the distribution line 4a unrelated to the occurrence of the leakage, that is, identifies the connection line 4a at the right end in the figure. Can handle the load 5a.

The specification of the load 5a in the load specifying device 13 will be described in detail below. Distribution line 4 at the left end in the figure
When only one load 5a is connected to one distribution line 4a as in a, the load identifying device 13 detects the left side distribution line 4a in the figure detected by the clamp meter 34.
The waveform of the current flowing through is compared with the leakage current waveform. If the two waveforms match, the load identifying device 13
Specifies that the load 5a connected to the leftmost distribution line 4a is the load 5a in which the leakage has occurred.

Further, when the right-side distribution line 4a in the figure is specified by the comparison of the current waveforms by the load specifying device 13, the load specifying device 13 loads the load group control program stored in the load group control device 6. ON / OFF of each load 5a controlled by the load group control device 6 (not shown).
Read the OFF timing. Then, the load identification device 13
Compares the ON / OFF timings of the loads 5a with the waveform of the leakage current (rising / falling timing), and the timings of all the loads 5a controlled by the load group control device 6 match. The load 5a is identified as the load 5a that has leaked.

FIG. 2 is a time chart showing an example of ON / OFF timing of each load 5a controlled by the load group control device 6 and rising / falling timing of the leakage current. In this example, among the eight loads, namely, the first and second heaters, the first and second electromagnetic valves, the first and second motors, and the first and second lamps, the O of the second heater is selected.
It is determined that the N / OFF timing coincides with the rising / falling timing of the leakage current, and the second heater is identified as the load 5a having the leakage. The identification result is displayed on the display device of the load identification device 13.

In the load identifying device 13, the current waveform of the distribution line 4a detected by the clamp meter 34 and the leakage current waveform are compared, and the ON / OFF timing of the load 5a and the rising / falling timing of the leakage current are compared. In some cases, it may be difficult to identify the load 5a that has leaked. In such a case, for each load 5a connected to the distribution line 4a, the leakage record database (not shown) that records the past leakage occurrence is referred to, and the leakage has occurred with the highest probability in the past. The load 5a is identified as the load 5a that has leaked. The leakage record database is attached to the load identifying device 13 here.

There may be a plurality of loads 5a that can be specified, that is, there may be a plurality of candidates for the load 5a that has leaked due to the above-mentioned waveform comparison. In such a case, the waveforms of the currents flowing in the respective loads 5a are compared with the pre-ranked waveforms, and as a result, the load 5a determined to have the highest risk is specified as the load 5a having the leakage. . For example, regarding a continuous leakage current waveform (see FIG. 3) that is seen when a leakage occurs in a lighting device or the like, as the inclination (angle θ) of the illustrated waveform portion at the time of rising increases, the area (S = ∫) It can be said that the wider f (t) dt), the higher the risk. The load 5a exhibiting such a high-risk current waveform is identified as the load 5a having the leakage.

When the number of loads 5a constituting the load group 5 is extremely large, the load identifying device 13 narrows down and identifies the leaked load 5a as shown in FIG.
In advance, the waveform pattern of the leakage current is classified into a predetermined number, for example, four as shown in FIG. In the illustrated example, a continuous leakage (square wave) pattern [see FIG. 5 (a)] seen in a lighting device, an intermittent leakage (regular wave) pattern seen in a motor etc. [see (b)], a cylinder valve Intermittent leakage (non-regular wave) pattern [see the same (c)] seen in driving solenoids and transient leakage (instantaneous wave) pattern [see the same (d)] seen in outlet plugging equipment for construction ]
Classify into. Then, for each load 5a constituting the load group 5, which of the above four types the waveform pattern of the leakage current of the load 5a belongs to is registered in the waveform pattern database 41. Waveform pattern database 41
Is attached to the load identifying device 13 here.

When a leakage occurs, the load identifying device 13 searches the waveform pattern database 41 for a load 5a having a waveform pattern that matches the leakage current waveform from the clamp meter 31 (step 401). Here, the leakage current waveform from the clamp meter 31 is an intermittent leakage (regular wave) pattern. Therefore, the load 5a in which the waveform pattern of the leakage current is classified into the pattern B shown in FIG. 5B is the waveform pattern database. 41 is searched.

Next, the load identifying device 13 uses the load group control program (not shown) stored in the load group controller 6 to load each load 5 controlled by the load group controller 6.
Read the ON / OFF timing of a. Here, the load 5a classified into the waveform pattern of pattern B is turned ON /
Only the OFF timing is read.

The load identifying device 13 reads the read ON / O
The FF timing and the waveform (rise / fall timing) of the leakage current from the clamp meter 31 are compared with each other. Then, each load 5 having the waveform pattern of pattern B
The load 5a whose ON / OFF timing is the same as the rising / falling timing of the leakage current from among a.
The load 5a is found, and it is identified as the load 5a having the leakage, and the fact is displayed on the display device of the load identifying device 13 (step 402).

In the illustrated example, the load identifying device 13 also determines the degree of risk of leakage (the degree or scale of leakage), and if the degree of risk is high, the fact is indicated together with the result of identifying the load 5a in which leakage has occurred. A terminal device (not shown) installed in the desired department is notified by e-mail or the like (step 40).
3).

In the above embodiment, the leakage current (waveform)
Although the clamp meter is used for the detection of, the detection may be performed by other means. In addition, the measurement of the leakage current (ground wire current) of the distribution transformer and the detection of the leakage current (waveform) applied to the distribution line identifying device or the load identifying device were performed using separate current detecting means, Alternatively, the current detection means may be used.

Further, in the above-mentioned embodiment, various data such as the current value obtained in the leakage measuring / informing device, the distribution line identifying device and the load identifying device, the distribution line and load identifying result, etc. are recorded together with the date and time. According to this, according to the generated leakage, especially infrequent leakage,
After the fact, it becomes easy to add various examinations and to devise appropriate measures against leakage.

In the above-described embodiment, the monitoring / informing section of the leakage measuring / informing device, the distribution line identifying device, and the load identifying device are each composed of a personal computer, but such a personal computer usually has a comfortable posture for the operator. Place it on your desk for use at. In this way, the monitoring / informing unit of the leakage measuring / informing device,
If the distribution line identifying device and the load identifying device are configured by a personal computer and placed on a desk, monitoring work can be performed in a safe place and posture. Further, since the result of specifying the distribution line and the load related to the occurrence of electric leakage is also displayed on the display device (display) of the personal computer, even a person who does not have electrical knowledge or knowledge of production equipment can easily carry out monitoring and confirmation work.

[0051]

According to the invention described in claim 1, the power supply for supplying the electric power from the substation to each load through the distribution transformer and the distribution / distribution means having a plurality of hierarchical structures. In the system, the observer who was informed that the leakage current was measured by the distribution transformer was the shortest power distribution / distribution from the many distribution / distribution means to the number of layers of the distribution / distribution means. It is possible to trace the means to reach the distribution / distribution means at the lowermost layer and specify the load in which the leakage has occurred. Therefore, even in a power supply system in which the total number of loads connected to the distribution / distribution equipment is enormous, it is possible to easily and quickly specify the load (leakage generation load) that is the cause of the leakage when the leakage occurs.

According to the second aspect of the present invention, it is possible to identify the load in which the leakage has occurred only by comparing the current waveform of the distribution line with the leakage current waveform or by comparing the load control timing with the leakage current waveform. Even if it is difficult, it is possible to identify an appropriate load.

Further, according to the invention described in claim 3, in the invention described in claims 1 and 2, even when there are a plurality of loads that can be specified as those that have caused an electric leakage, the judgment result is appropriate without variation. Can be specified.

Further, according to the invention described in claim 4, the existing LAN can be used also as the communication path between the leakage measuring / informing device and the terminal device, and the terminal device is a general-purpose personal computer or work. It becomes possible to use stations, etc., and equipment costs can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a device of the present invention.

FIG. 2 is a time chart showing an example of a control timing and a leakage current waveform of each load controlled by a load group control device in the same device.

FIG. 3 is a current waveform diagram of a load for explaining the risk of leakage.

FIG. 4 is an explanatory diagram of a procedure for narrowing down and specifying a leaked load when the number of loads is extremely large.

FIG. 5 is a diagram showing examples of waveform patterns of four types of leakage currents.

[Explanation of symbols]

1 Distribution transformer 2 Low-voltage large-capacity distribution device (distribution / distribution means) 2a Low voltage main line (distribution line) 3 distribution board (distribution and distribution means) 3a, 4a distribution line 4 branch circuits (distribution and distribution means) 5 load groups 5a load 6 load group controller 11 Leakage measurement / informing device 12 (12a, 12b) Distribution line identification device 13 Load identification device 21 Terminal

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Harumi Suzumura             1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto             Car Co., Ltd. (72) Inventor Ken Aoyama             1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto             Car Co., Ltd. (72) Inventor Takehiko Oda             1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto             Car Co., Ltd. F-term (reference) 2G014 AA16 AB01 AB10                 5C086 AA31 BA13 CA03 DA08 DA40                       EA04 FA18                 5G042 DD03 DD15                 5G058 BB02 BC16 BD10 BD12 BD14

Claims (4)

[Claims] 1. A leakage diagnostic device in a power supply system for supplying electric power from a substation to each load via a distribution transformer and a plurality of hierarchical distribution / distribution means, wherein the distribution transformer is used. When a leakage current of a predetermined value or more is measured by a container, a leakage measuring / informing device that informs a terminal device installed at a desired one or a plurality of locations that leakage has occurred; Distribution lines provided corresponding to the distribution / distribution means of each layer except the bottom layer, and comparing the waveform of the current flowing through each distribution line in the distribution / distribution means with the waveform of the leakage current to cause a leakage. And a distribution line identifying device that displays the result on a display device, comparing the waveform of the current flowing through each distribution line in the distribution / distribution means of the lowest layer of the hierarchical structure with the waveform of the leakage current. Leakage from the load connected to each distribution line The generated load is specified, or the load is connected to the distribution line in the distribution / distribution means of the lowest layer, and a plurality of loads are turned on at a preset timing.
A load identifying device for identifying a load in which a leakage has occurred by comparing the control timing of each load by the load group control device for N / OFF control with the waveform of the leakage current, and displaying the result on a display device. Leakage diagnosis device. 2. A leakage recording database for recording past leakage occurrences for each load is additionally provided, and the load identifying device identifies the load that has caused the leakage by also referring to the data recorded in the leakage recording database. The leakage diagnostic device according to claim 1, wherein 3. When there are a plurality of loads that can be specified, the high-risk load that is determined from the waveform of the current flowing through each of the loads is specified as the load that has leaked. Leakage diagnosis device described in. 4. The leakage diagnosing device according to claim 1, wherein the notification to the terminal device by the leakage measuring / notifying device is made by electronic mail.