JPH11133094A - Leak monitoring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently specify a leak location and seek for the cause of leak generation. SOLUTION: Provided are a leak current detector 1A detecting leak current, a leak judgment part 2 judging to be significant leak when the leak current outputted from the leak current detector exceeds a predetermined first set value and continued time of exceeding the set value exceeds a predetermined second set value, a leak information history memory 7 storing the leak information after the leak current exceeds the first set value at every judgment of leak by the leak judgment part 2, and a leak information history indication part 30 indicating the latest leak information and that stored in the leak information history memory 7 on the same screen at every judgment of leak.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth leakage monitoring device for displaying earth leakage information such as the earth leakage current maximum value, earth leakage continuation time, earth leakage occurrence date and time, and the like.

[0002]

2. Description of the Related Art Conventionally, leakage information such as the maximum value of leakage current and the date and time of occurrence of leakage has been displayed to monitor the leakage.

[0003] By the way, the electric leakage may occur continuously, intermittently or instantaneously, may occur during the operation of a specific load, and furthermore, the relation of the operation timing between the specific loads, the load demand rate and the like. May occur in the relationship. It may also occur due to external conditions such as weather.

[0004]

However, as described above, since a leakage occurs due to various situations and causes as described above, a conventional leakage monitoring device that displays only leakage information at the time of a leakage detects a leakage point immediately. There was a problem that you can not.

[0005] It is an object of the present invention to provide a leakage monitoring device capable of efficiently specifying a leakage location.

[0006]

SUMMARY OF THE INVENTION The present invention relates to an earth leakage monitoring device for displaying earth leakage information obtained when an earth leakage occurs and monitoring the earth leakage.

According to a first aspect of the present invention, an electric leakage current detecting section for detecting an electric leakage current, an electric leakage current outputted by the electric leakage current detecting section exceeds a predetermined first set value and the set current value The second time that continues beyond
When the leakage value exceeds the first set value, the leakage determination unit that determines that there is a serious leakage and the leakage information after the leakage current exceeds the first set value are determined to be leakage by the leakage determination unit. Leakage information history storage unit that stores the latest leakage information and the leakage information that is stored in the leakage information history storage unit on the same screen each time it is determined that a leakage has occurred. Section.

According to the first aspect of the present invention, by displaying the leak information during the leak and the past leak information in a cascade sequence, it can be understood that the leak occurs continuously, intermittently or instantaneously. It can be seen that the error occurs during the operation of the specific load, and that the error occurs in the relationship between the operation timing of the specific loads and the load demand rate. In addition, since it is known that the fault occurs due to an external condition such as weather, it is easy to specify a leak location.

According to a second aspect of the present invention, the leakage information includes at least trunk line information provided with a leakage current detecting unit, the date and time of occurrence of leakage, the duration of leakage when the leakage current exceeds a first set value, and the leakage. Is the maximum value of the leakage current after the determination is made.

In the second aspect of the present invention, by displaying a large amount of leakage information, it is easy to find the cause of the leakage.

According to a third aspect of the present invention, there is provided an external data processing device for externally storing the leakage information and performing data processing.

According to the third aspect of the present invention, by providing the external data processing device, a database of leakage information can be created.

[0013]

FIG. 1 is a schematic block diagram of a ground fault monitoring device according to an embodiment of the present invention, and FIG. 2 is a detailed block diagram of FIG. 1 and 2, 1A, 1
B, 1C,..., 1N are installed, for example, for each main line of the power receiving facility, and are configured to include a zero-phase current transformer.
A, 20B, 20C,..., And 20N store the history of the leakage information and output the leakage information history output unit that outputs the history, and 30 indicates the leakage information history display unit that displays the history of the leakage information. The leakage information history output units 20A to 20N and the leakage information history display unit 30 constitute a leakage monitoring device body.

2 is a first comparator 2a, a first setting unit 2
b, an earth leakage determination and duration generation unit including an earth leakage duration calculation circuit 2c, a second comparator 2d, and a second setting unit 2e. The first setting unit 2b sets the leakage current as the first set value, and the leakage duration calculation circuit 2c calculates the time during which the leakage current continues beyond the first set value, and the second The setter 2e sets a mask time for cutting off the leakage current so as not to cause a problem as the second set value.

Reference numeral 3 denotes a current date and time generation unit including a calendar / clock 3a and a current date and time storage circuit 3b. Reference numeral 4 denotes a leakage current maximum value generation unit constituted by a peak hold circuit. Reference numeral 5 denotes a main line information setting unit that sets, for example, a main line number where the leakage current detecting unit 1A is installed.

Reference numeral 6 denotes first to fourth switch circuits 6a to 6a
d is a leakage information output unit. The first switch circuit 6a outputs the date and time when the leakage occurred, and the second switch circuit 6b
Outputs the leakage time, the third switch circuit 6c outputs the maximum value of the leakage current, and the fourth switch circuit 6d outputs the trunk line number. Reference numeral 7 denotes a leakage information history storage unit that stores leakage information such as the date and time of leakage, the duration of leakage, the maximum value of leakage current, and the trunk line number.

Reference numeral 30 denotes a leakage information history display unit having a control function of displaying leakage information during leakage and past leakage information on a predetermined screen form. Reference numeral 40 denotes an external data processing device.

The above-described leakage determination / continuous time generation unit 2, current date and time generation unit 3, leakage current maximum value generation unit 4, trunk line number setting unit 5, leakage information output unit 6, and leakage information history storage unit 7 provide a leakage information history. An output unit 20A is configured, and the leakage information history output units 20B to 20N are configured in the same manner as the leakage information history output unit 20A.

In the leakage monitoring device configured as described above, it is assumed that a leakage current is first detected by, for example, a leakage current detection unit (hereinafter, referred to as a detection unit) 1A. Leakage current (hereinafter referred to as current) output by the detection unit 1A.
Is input to the earth leakage determination and duration generation unit 2 constituting the earth leakage information history output unit 20A. The first comparator 2a receives the current I
Is compared with the set value Is set in the first setter 2b, and outputs an "H" level signal when I> Is.
The earth leakage duration calculating circuit 2c calculates the duration T of the "H" level signal, and the second comparator 2d calculates the duration T
Is compared with the set value Ts set in the second setter 2e. When T> Ts, an "H" level signal is output, and it is determined that there is a serious leakage.

When the current I and the first set value Is satisfy I> Is, the "H" level signal output by the first comparator 2a is also input to the current date and time generation unit 3.
The current date and time storage circuit 3b detects the rise of the "H" level signal, stops the advance of the date and time sent from the calendar / clock 3a at that time, and stores the date and time at that time.

"H" output from the second comparator 2d
The level signal is input to the leakage information output unit 6. The first switch circuit 6a outputs the current date and time stored in the current date and time storage circuit 3b as the earth leakage occurrence date and time, and the second switch circuit 6b calculates the duration calculated by the earth leakage duration calculation circuit 2c as the earth leakage duration. When the current I and the first set value Is satisfy I> Is, the third switch circuit 6c outputs the leakage current maximum value held in the leakage current maximum value generation unit 4, The fourth switch circuit 6d outputs the trunk number set in the trunk information setting unit 5.

The earth leakage information including the earth leakage occurrence date and time, the earth leakage continuation time, the maximum current value, and the trunk number output by the earth leakage information output unit 6 are input to the earth leakage information history display unit 30. This display unit displays the leakage information at the top of the format screen as shown in FIG. 3, for example, and sequentially displays the latest leakage information after the duration T and the second set value Ts become T> Ts. Display.

The leak information output by the leak information output unit 6 is also input to the leak information history storage unit 7, and the history storage unit 7 stores the information when the current I and the set value Is satisfy I <Is. , The output of the first comparator 2 detects the falling of the "L" level signal, and the leakage information at that time is stored.

When the leakage information is stored in the leakage information history storage unit 7, the leakage duration calculation circuit 2c and the current date and time storage circuit 3b are slightly delayed from the time when I <Is.
Then, the contents of the leakage current maximum value generation unit 4 are reset.

Next, similarly, when the current is detected by the detecting unit 1A and it is determined that there is a serious leakage, the latest time after the time T and the set value Ts become T> Ts as described above. The leak information is displayed on the first row of the format screen as shown in FIG. 4, and the previously stored leak information is displayed on the second row.

Subsequently, for example, when a current is detected by the detecting unit 1C and it is determined that a leakage has occurred, the latest leakage information after T> Ts as described above is displayed on a format screen as shown in FIG. In the first row, the previously stored leakage information is displayed in time series on the first and second rows.

As described above, the latest leakage information and the previously stored leakage information are displayed in chronological order on the leakage information history display section 30 each time it is determined that a leakage has occurred.
The relationship between these pieces of leakage information can be understood, and the location of the leakage can be easily specified. Also, since a large amount of leakage information is displayed, it is easy to find out the cause of the leakage.

By the way, the leakage information stored in the leakage information history storage unit 7 is stored in a computer, for example, as an external data processing device 40 provided outside, and subjected to data processing, whereby a database of leakage information can be created. .

In the above embodiment, the leakage information is displayed from the point of time when it is determined that the leakage has occurred. However, the leakage information may be displayed when the current I and the set value Is satisfy I <Is. In addition, the current date and time generation unit 3, the trunk line information set unit 5, and the leakage information history storage unit 7 are provided in correspondence with the number of installed leakage current detection units. it can. Further, the leakage information history output unit 20
The operations of A to 20N can be processed by a sequencer or a computer. Further, the maximum value of the leakage current may be displayed as the leakage information.

[0030]

As described above, according to the present invention, the leakage information during the leakage and the past leakage information are displayed in a series, so that the relevance between these leakage information can be known, and It is possible to easily find a leakage point.

According to the second aspect of the present invention, since a large amount of leakage information is displayed, it is possible to determine the cause of the occurrence of leakage.

Further, according to the third aspect of the present invention, since the external data processing device for storing the leakage information and performing data processing is provided outside, a database of the leakage information can be created.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a leakage monitoring device according to an embodiment of the present invention.

FIG. 2 is a detailed block diagram of FIG.

FIG. 3 is a diagram illustrating a screen display on a display unit when there is one leakage information;

FIG. 4 is a diagram showing a screen display of a display unit when there are two pieces of leakage information.

FIG. 5 is a diagram showing a screen display of a display unit when there are three pieces of leakage information.

[Explanation of symbols]

 1A to 1N Leakage current detection unit 2 Leakage determination / duration generation unit 3 Current date and time generation unit 4 Leakage current maximum value generation unit 5 Main line information set unit 6 Leakage information output unit 7 Leakage information history storage unit 30 Leakage information history display unit 40 External data processing device

Claims (3)

[Claims] 1. A leakage monitoring device that displays leakage information obtained when a leakage occurs and monitors the leakage, wherein: a leakage current detection unit that detects a leakage current; and a leakage current that is output by the leakage current detection unit. A leakage determining unit that determines that the leakage is a serious leakage when the time that exceeds the predetermined first set value and continues for more than the set value exceeds a predetermined second set value; A leakage information history storage unit that stores leakage information after the leakage current exceeds a first set value each time the leakage determination unit determines that there is a leakage; a latest leakage information and the leakage information An electric leakage monitoring device comprising: an electric leakage information history display unit that displays electric leakage information stored in a history storage unit on the same screen each time it is determined that electric leakage is occurring. 2. The leakage information includes at least main line information provided with the leakage current detection unit, a leakage occurrence date and time, a leakage continuation time when the leakage current exceeds a first set value, and a leakage. The leakage monitoring device according to claim 1, wherein the leakage monitoring device is a leakage current maximum value after the determination. 3. An external data processing device for externally storing the leakage information and performing data processing.
Or the earth leakage monitoring device according to claim 2.