JP2008305596A - Ground-fault circuit interrupter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ground-fault circuit interrupter which can prevent an unnecessary operation and can comprehend visually a ground fault current occurring at present by operating with the ground current flowing in the ground due to insulation failure of an AC current path and equipment etc. as a reference, even if the leakage current component is increased out of the leakage current flowing in the AC current path and equipment, and even after the operation, can recognize the leaking state in the current path immediately before operation, and which can prevent exactly an electric shock accident and a leakage fire accompanying the insulation failure of the AC current path and the equipment etc. <P>SOLUTION: The ground-fault circuit interrupter includes a display means to display the size of ground fault current detected by a ground fault current detection means and a tripping means which, when the ground fault current of a prescribed size is detected, acts on a contact switching mechanism of the circuit breaker by receiving an operation signal from the ground fault current detection means, and opens a contact by the ground fault current. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention detects an earth leakage current component in an earth leakage current and an earth leakage current component of the earth leakage current in an AC circuit or equipment, and when the earth leakage current or the earth fault current becomes a predetermined magnitude, it is predetermined. The present invention relates to an earth leakage circuit breaker having a function of performing an operation.

Generally, in places where electricity is used, circuit breakers and earth leakage breakers are installed for the purpose of protecting electric wiring and preventing electric shock accidents due to electric leakage.

The earth leakage breaker is a circuit breaker that operates when a predetermined earth leakage current is detected in the electric circuit for electric shock protection, and detects the earth leakage current as shown in Non-Patent Document 1 to Non-Patent Document 3. , The measured value (leakage current value) and the set value (sensitivity current value) are compared, and when the measured value exceeds the set value, the circuit is cut off and protected.

Japanese Industrial Standards JIS C8201-2-2 Low Voltage Switchgear and Control Unit-Part 202: Earth Leakage Breaker December 20, 2004 Published by the Japanese Standards Association Japanese Industrial Standards JIS C8221 Earth Leakage Breaker for Residential and Similar Facilities-No Overcurrent Protection Device (RCCBs) December 20, 2004 Published by the Japanese Standards Association Japanese Industrial Standards JIS C8222 Earth Leakage Circuit Breakers for Residential and Similar Facilities with Overcurrent Protection Devices (RCBOs) December 20, 2004 Published by Japanese Standards Association Magazine Electrical Equipment Issuer OHM Co., Ltd. March 2007 Volume 36, Volume 3, Volume 431 Front 42P-Front 48P Photo 2

In recent years, there are an increasing number of circuits that require continuous power supply, such as factory power distribution equipment and power supplies for various machine tools. However, there are increasing situations in which it is desirable to continue feeding.

By the way, the leakage current includes the ground fault current component (resistance leakage current) that flows to the ground due to insulation faults in the AC circuit and equipment, and the leakage current that flows from the live parts of the AC circuit and equipment to the ground when there is no insulation failure. It is expressed as a vector sum of components (capacity leakage current). For this reason, when the leakage current is calculated by calculating the vector sum, the contribution of the leakage current component (capacitance leakage current) increases due to an increase in ground capacitance depending on the construction conditions of the circuit. However, as a result of the vector sum calculation, the leakage current may reach the sensitivity current value.

That is, in practice, there is no insulation failure in the AC circuit and equipment, and the insulation resistance is maintained, and there is no possibility of an electric shock or a leakage accident, but the leakage current is apparently increased. In some cases, the magnitude of the earth leakage current reaches the sensitivity current value set in the earth leakage breaker and the breaking operation is performed.

Now, when the earth leakage breaker is installed in the electric circuit and the earth leakage circuit breaker is operated by the electric leakage current, the power supply to the electric circuit is stopped, and the power distribution equipment and various machine tools in the factory are stopped. When the earth leakage circuit breaker is operated, the user has inspected the insulation failure in the electric circuit and measured the insulation resistance value in the electric circuit in order to improve the insulation failure appropriately.

However, as described above, in reality, there is no insulation failure in the AC circuit and equipment, and the insulation resistance is maintained, and there is no possibility of an electric shock or a leakage accident, but the leakage current apparently increases. As a result, the magnitude of the leakage current may reach the sensitivity current value set in the leakage breaker and the circuit breaker may be operated. Even if the insulation resistance measurement work in the circuit is performed, Insulation resistance values may be maintained, and the work of measuring the insulation resistance may be difficult.

As described above, due to the earth leakage breaker operation of the earth leakage breaker, power supply to the electric circuit is stopped, and it is necessary to check for insulation failure and measure the insulation resistance value in order to identify the cause of the breaking operation. If this is an unnecessary operation due to leakage current components, the factory power distribution equipment and various machine tools could stop operating, resulting in significant production losses.

As a device for detecting the ground fault current as described above in the electric circuit, a method of detecting an insulation monitoring device as shown in Non-Patent Document 2 by installing it in the electric circuit is common. In this case, it is necessary to newly install and operate a monitoring device separately from the circuit breaker, and there is a concern that work costs and equipment costs for installing the monitoring device will increase.

In addition, when the earth leakage breaker operates, the power supply to the electric circuit is cut off, so that the supply of power to the electrical equipment and facilities installed in the electric circuit is stopped, thereby confirming that the circuit breaker has been activated. Can be recognized. However, until the leakage breaker is installed and the breaker is checked, it cannot be recognized whether the cause of the breakage is due to leakage or overcurrent. This makes it difficult to make decisions on pitching, prolongs the power outage time, and increases the loss due to the stop of power supply to the electrical equipment and facilities.

Therefore, the present invention operates with reference to the ground fault current that flows to the ground due to poor insulation of the AC circuit or equipment, even if the leakage current component of the leakage current that flows to the AC circuit or equipment increases. Unnecessary operation can be prevented and the current ground fault current can be grasped visually. Even after the operation, the leakage status in the circuit immediately before the operation can be recognized. The purpose is to provide an earth leakage circuit breaker that can accurately prevent electric shock accidents and leakage fires due to poor insulation in AC circuits and equipment, with reduced manufacturing costs and development time. It is another object of the present invention to provide an earth leakage breaker that can be used in the conventional manner according to the usage situation of the user by detecting the earth leakage current and performing the operation.

In the present invention, the earth leakage breaker is
Current that flows to the ground due to poor insulation in AC circuits and facilities, and current that flows to ground due to poor insulation in the AC circuits and facilities, etc. A ground fault current detecting means for detecting the ground fault current,
When the ground fault current of a predetermined magnitude is detected by the ground fault current detecting means, it acts on the contact opening / closing mechanism section that turns on and off the electric circuit of the circuit breaker interposed in the electric circuit, and the contact is opened. A tripping means,
Sensitivity current setting means for variably setting the magnitude of the ground fault current detected by the ground fault current detection means;
Display means for displaying a ratio of the magnitude of the currently occurring ground fault current to the ground fault current of the predetermined magnitude set by the sensitivity current setting means,
And a first trip means that, when a predetermined current flows through the contact opening / closing mechanism and the electric circuit, performs a tripping action so that the contact opening / closing mechanism is opened. And a second trip means comprising a trip coil that operates in response to a predetermined operation signal and performs a tripping operation so that the contact switching mechanism performs an opening operation,
A circuit breaker block comprising a leakage current detecting means for detecting a leakage current in the electric circuit;
A ground fault current detecting means for detecting a ground fault current in the electric circuit, the sensitivity current setting means, the display means,
And a ground fault current detection block equipped with a connecting means,
In the circuit breaker block, a zero-phase current transformer provided so as to penetrate the electric circuit,
The ground-fault current detection means block includes at least a power acquisition unit connected to the primary side of the contact in the circuit breaker block for acquiring power, and acquisition of an output signal obtained from the zero-phase current transformer. When a ground fault current of a predetermined magnitude is detected by the zero-phase current transformer output signal acquisition unit to be performed and the ground fault current detection means, a ground operation signal is output to the leakage current detection means. And a fault current detection signal transmitter.
Through the power acquisition unit, the zero-phase current transformer output signal acquisition unit, and the ground fault current detection signal transmission unit, power and signals are transmitted and received between the circuit breaker block and the ground fault current detection block. A ground fault circuit breaker is provided.

As a result, when a normal overcurrent or short-circuit current occurs, the circuit is blocked by the first tripping device and the wiring can be protected, and the earth that flows to the ground due to poor insulation of the AC circuit or equipment. The ground fault current detection block that detects the fault current component can be configured and manufactured separately. By connecting each with the connecting means, the conventional circuit breaker is used as much as possible and is generated at present. It is possible to visually grasp the ground fault current, and even after the operation, it is possible to recognize the leakage state in the electric circuit immediately before the operation, and only the information necessary for detecting the ground fault current is obtained from the circuit breaker side. An earth leakage circuit breaker that can be acquired and can be manufactured with improved development efficiency can be provided.

The ground fault current detection means block includes an operation mode that the earth leakage breaker takes when a ground fault current of a predetermined magnitude is detected by the ground fault current detection means from among the predetermined operation modes. The earth leakage circuit breaker is characterized in that selection means for selecting is provided, and the operation mode includes at least an alarm signal output unit provided in the earth leakage breaker and an alarm mode for outputting an alarm signal from the notification unit. Is provided.

As a result, the operation of the earth leakage breaker when the ground fault current of the predetermined magnitude is detected by the ground fault current detecting means is suitable from the predetermined operation mode according to the condition of the circuit and the user's desire. In the vicinity of the earth leakage breaker, an alarm from the notification unit can recognize that the ground fault current has been detected by the ground fault current detecting means. In a place away from the earth leakage breaker, it can be recognized by receiving an alarm signal from the alarm signal output unit, and an alarm can be recognized effectively.

In addition, the current to be detected, which is the operating factor of the circuit breaker that operates in the circuit or the operation that issues an alarm,
Current that flows to the ground due to poor insulation of AC circuits and facilities, and leakage current that includes current that flows from the charging section of the AC circuits and facilities to the ground, or current that flows to ground due to insulation defects of the AC circuits and facilities Selection means for selecting from among the ground fault currents,
Detection target current detection means for detecting the detection target current selected by the selection means;
When the current to be detected is detected by the current detection means to be detected, it acts on the contact opening / closing mechanism for turning on and off the electric circuit of the earth leakage breaker, and the contact is opened. A tripping means,
Sensitivity current setting means for variably setting the magnitude of the detection target current detected by the detection target current detection means;
Display means for displaying the ratio of the magnitude of the ground fault current currently generated with respect to the current of the detection target of the predetermined magnitude set by the sensitivity current setting means,
And a first trip means that, when a predetermined current flows through the contact opening / closing mechanism and the electric circuit, performs a tripping action so that the contact opening / closing mechanism is opened. And a second trip means comprising a trip coil that operates in response to a predetermined operation signal and performs a tripping operation so that the contact switching mechanism performs an opening operation,
A circuit breaker block comprising a leakage current detecting means for detecting a leakage current in the electric circuit;
A detection target current detection block comprising: a detection target current detection means for detecting a detection target current in the electric circuit; the sensitivity current setting means; and the display means;
The circuit breaker block is provided with a zero-phase current transformer provided so as to penetrate the electric circuit, and the current detection means block to be detected includes at least the circuit breaker block. A power acquisition unit connected to the primary side of the contact for acquiring a power source, a zero phase current transformer output signal acquisition unit for acquiring an output signal obtained from the zero phase current transformer, and a current detection of the detection target A ground fault current detection signal transmission unit that outputs a predetermined operation signal toward the leakage current detection means when a current of a predetermined magnitude is detected by the means;
Through the power acquisition unit, the zero-phase current transformer output signal acquisition unit, and the ground fault current detection signal transmission unit, transmission and reception of power and signals between the circuit breaker block and the current detection block to be detected are performed. An earth leakage breaker may be provided which is characterized in that it is performed.

As a result, depending on the condition of the electric circuit and the desire of the user, the current to be detected is changed to a current that flows to the ground due to poor insulation of the AC circuit and equipment, and a current that flows from the charging part of the AC circuit and equipment to the ground. Can be selected and operated as appropriate from the earth leakage current that contains the earth current and the ground fault current that flows to the ground due to faulty insulation of the AC circuit and equipment. When a normal overcurrent or short-circuit current occurs, the first It is possible to separate and configure the circuit breaker block that can cut off the electric circuit by the disconnecting device and protect the wiring, and the current detection block that detects the current to be detected. By connecting with the connecting means, it is possible to visually grasp the current ground fault current while using the conventional circuit breaker as much as possible, and the information necessary for detecting the current to be detected. To provide a leakage breaker that can be acquired from the circuit breaker side, can recognize the leakage state in the circuit immediately before operation even after operation, and can be manufactured with improved development efficiency Therefore, it is possible to provide a highly convenient earth leakage breaker.

The current detection means block to be detected has an operation mode that the earth leakage breaker takes when a current of the detection target of a predetermined magnitude is detected by the current detection means to be detected. The operation mode is configured to include at least an alarm signal output unit provided in the earth leakage breaker and an alarm mode for outputting an alarm signal from the notification unit. An earth leakage breaker may be provided.

As a result, the operation of the earth leakage breaker when the current detection means having a predetermined magnitude is detected by the current detection means to be detected can be changed in a predetermined operation mode according to the condition of the electric circuit and the user's desire. In the vicinity of the earth leakage breaker, an alarm from the notification unit recognizes that a current to be detected having a predetermined magnitude has been detected by the current detection means to be detected. In a place away from the earth leakage breaker, it can be recognized by receiving an alarm signal from the alarm signal output unit, and an alarm can be recognized effectively.

The current detection means block to be detected has an operation mode that the earth leakage breaker takes when a current of the detection target of a predetermined magnitude is detected by the current detection means to be detected. The operation mode is configured to include at least an alarm signal output unit provided in the earth leakage breaker and an alarm mode for outputting an alarm signal from the notification unit. An earth leakage breaker may be configured.

As a result, the operation of the earth leakage breaker when the ground fault current of the predetermined magnitude is detected by the ground fault current detecting means is suitable from the predetermined operation mode according to the condition of the circuit and the user's desire. In the vicinity of the earth leakage breaker, an alarm from the notification unit can recognize that the ground fault current has been detected by the ground fault current detecting means. In a place away from the earth leakage breaker, it can be recognized by receiving an alarm signal from the alarm signal output unit, and an alarm can be recognized effectively.

According to the earth leakage breaker of the present invention, even if the leakage current component increases in the earth leakage current flowing through the AC circuit or equipment, the circuit breaker operates based on the ground fault current flowing to the ground due to insulation failure of the AC circuit or equipment. By doing so, unnecessary operation can be prevented and the current ground fault current can be grasped visually, and even after the operation, the leakage status in the circuit immediately before the operation can be recognized. The purpose is to provide an earth leakage circuit breaker capable of accurately preventing electric shock accidents and leakage fires due to poor insulation in AC circuits and equipment, etc., with reduced manufacturing costs and development time during development. . Furthermore, it is possible to provide an earth leakage circuit breaker that can be used in the conventional manner according to the use situation of the user by detecting the earth leakage current and performing the operation.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, substantially the same parts are denoted by the same reference numerals.

(First embodiment)
<Appearance of earth leakage breaker>
As a first embodiment, an example of an earth leakage breaker generally used in a three-wire electric circuit is shown, and external views thereof are shown in FIGS.

FIG. 1 shows an external view of the earth leakage circuit breaker during operation.
The earth leakage circuit breaker 1 is composed of a circuit breaker block 10 that is normally connected to an electric circuit and a ground fault current detection block 20 that detects a ground fault current. The circuit breaker block 10 and the ground fault current detection block 20 have a hook-like projection 21 provided on the ground fault current detection block 20 side as shown in FIG. It is connected by fitting with a concave portion corresponding to the hook-shaped convex portion.

Outside the housing of the circuit breaker block 10, a power supply side terminal 102 and a load side terminal 103 connected to an electric circuit are provided,
Inside the casing of the circuit breaker block 10, there are a contact opening / closing mechanism section for turning on and off the electric circuit, an operation handle 101 for partially driving the contact opening / closing mechanism section by exposing it to the outside of the casing, When a predetermined current such as an overcurrent flows in the electric circuit, a thermal element or an electromagnetic trip element that acts on the contact opening / closing mechanism and performs a tripping operation so that the contact opening / closing mechanism performs an opening operation is included. First trip means comprising: a second trip means comprising a trip coil that operates in response to a predetermined operation signal and performs a trip operation so that the contact opening / closing mechanism portion performs an open operation;
A leakage current detecting means for detecting a leakage current in the electric circuit is provided.

The leakage current detecting means is connected to a zero-phase current transformer 107 provided so as to pass through the electric circuit in the circuit breaker block 10 and a signal output unit of the zero-phase current transformer 107 to detect a leakage to be detected. A sensitivity changeover switch 108, which is a resistance changeover switch that determines the magnitude of the current, is connected to the sensitivity changeover switch 108, and an output signal from the zero-phase current transformer 107 is input to generate a leakage current. It is configured using a generally used leakage IC 109 that outputs a cut-off signal when it is determined whether or not a leakage current is generated.

The ground fault current detection block 20 includes
A ground-fault current detecting means for detecting a ground-fault current component in the electric circuit, and a predetermined operation toward the ground-fault current detecting means when a ground-fault current of a predetermined magnitude is detected by the ground-fault current detecting means. And a ground fault current detection signal transmission unit 303 that outputs a signal.

The ground fault current detection block 20 includes an alarm display signal when a ground fault current of a predetermined magnitude is detected by the information display operation unit 201 that can be operated or visually recognized from the outside of the housing and the ground fault current detection means. Is output to the outside.

The information display operation unit 201 is provided with a display unit 202 for displaying various types of information, an operation unit 205 for setting operating conditions of the earth leakage breaker, and a reset unit 204 for stopping the alarm. The information display operation unit 201, the alarm signal output unit 203, and the ground fault current detection means are connected to an arithmetic processing circuit to be described later, and the arithmetic processing circuit detects and determines the ground fault current and leakage current in the electric circuit. Or the operation of the earth leakage breaker when the ground fault current is detected.

The circuit breaker block 10 and the ground fault current detection block 20 include a power source acquisition unit, a zero-phase current transformer output signal acquisition unit, a ground fault current detection signal, which will be described later, in order to transmit and receive power and signals. And a power source acquiring unit, a zero-phase current transformer output signal acquiring unit, and a hole for drawing out or drawing in the ground fault current detection signal transmitting unit. Provided in the fault current detection block 20.

<Operation unit>
An enlarged view of the operation unit 205 is shown in FIG.
The operation unit 205 is a push button type operation unit,
A setting item selection unit 205a for setting the operation mode of the earth leakage breaker 1,
A setting value determination unit 205b for performing a determination operation on the setting item selected by the setting item selection unit 205a;
A set value increasing unit 205c, a set value decreasing unit 205d for performing an increase / decrease selection operation for setting items such as the sensitivity current value,
A set value confirmation unit 205e for confirming the set value.

<Display section>
The display unit 202 is composed of a liquid crystal display, and the display unit 202 visually displays various setting values for operating the earth leakage circuit breaker and the ratio of the current to be detected to the setting value. The operation processing circuit is operated in conjunction with the operation unit 205, and items operated on the operation unit 205 are stored in the operation processing circuit unit and appropriately displayed on the display unit 202. Has been.

<Display during operation>
The display unit in FIG. 1 shows various display states when the earth leakage breaker 1 is in operation. In the display unit 202, a detection method in which the earth leakage breaker 1 displays a current to be detected as an operation factor of an operation for interrupting or issuing an alarm,
Sensitivity current that displays the sensitivity current that is the operation threshold for the current to be detected;
A current level indicating a ratio of a current to be detected with respect to the sensitivity current;
The operation mode indicating the operation mode when the current to be detected reaches a predetermined magnitude (sensitivity current) is displayed, and information necessary for operation is displayed so that the user can visually recognize it.

<Display when checking the set value>
Next, the display unit in FIG. 2 shows various display states when the set value of the earth leakage breaker 1 is confirmed. In this state, when the set value confirmation unit 205e in the operation unit 205 is pressed, the set value stored in the arithmetic processing circuit is read, and various set values currently set on the display unit 202, that is, The detection method, the sensitivity current, the operation mode, and the operation time until the operation is performed based on the operation mode when the current to be detected reaches the sensitivity current are displayed. Thereby, the user can visually recognize the set value of the earth leakage breaker 1 by checking the display unit.

<Display at the time of setting>
Next, the display part in FIG. 3 thru | or FIG. 6 shows the state of the display in the case of making various settings of the earth leakage breaker 1.
In this embodiment, there are three main items as the setting items: the “detection method”, the “sensitivity” for setting the sensitivity current, and the “operation” for setting the operation mode and the operation time. The large items are accompanied by detailed setting items (small items), and will be described step by step.

<Basic selection / decision flow>
First, the basic selection / determination flow will be described.
When making various settings for the earth leakage breaker 1, the setting item selection unit 205a is pressed. Then, a signal is input to the arithmetic processing circuit, and the earth leakage breaker 1 is switched to the large item selection acceptance standby mode.

In the large item acceptance standby mode, a large item is displayed as a list on the display unit 202, and the setting item to be set is displayed in reverse from other setting items within a predetermined area (inverted cursor overlay). It is easy to see which setting item is selected. The small items are displayed simultaneously with the display of the large items. In this state, when the set value determination unit 205b is pressed, the selected large item is selected and determined, and the mode is switched to the reception standby mode for the small item attached to the large item. At this time, the sub-items are displayed as a list, and the setting item to be set is highlighted with respect to other setting items in a predetermined area, so that it is easy to visually recognize which setting item is selected. It is possible.

Note that the reverse display portion may be configured to blink so that the reverse display and the normal display are repeated so that the selection items become more conspicuous.

The setting item is switched by pressing the setting item selection unit 205a again. Each time the setting item selection unit 205a is pressed between the large items when the large item is selected and between the small items when the small item is selected, another setting item is selected. It is possible to visually recognize which setting item is selected by moving the cursor.

In addition, when determining the setting of the selected setting item, by pressing the set value determining unit 205b, the set processing value is stored in the arithmetic processing unit at the same time.
When the small item is selected, it switches to the selected state of the large item,
When the large item is selected, the operation state is switched.

When the setting item selection unit 205a or the setting value determination unit 205b is pressed and no operation is continued for a predetermined time, the timer processing means that no signal is input to the arithmetic processing circuit. As a result, the operation status display is switched.

Before switching to the operation status display, the arithmetic processing circuit unit may process the user so that the user is in the middle of selecting the setting item by voice, buzzer, or blinking screen. .

<Actual selection / determination operation>
Next, a case where the setting item is selected / determined will be described with reference to FIGS. 3 to 6 based on the basic selection / determination flow described above.

First, in the display at the time of operation shown in FIG. 1 or the display state at the time of confirmation shown in FIG. 2, when the setting item selection unit 205a is pressed, the display unit displays the detection method, the sensitivity, The display switches to the selection display for selecting the major action items.

<Selection detection method>
FIG. 3 shows an initial display state when the display is switched to the selection display. In the initial display state, the cursor is displayed in a reverse overlay at the detection method, and the mode for selecting “detection method” is set. In this state, when the set value determination unit 205b is pressed, the active cursor changes to the current item (Io / Ior / off) to be detected, which is a small item of the detection method, and the set item selection unit 205a is pressed. By doing so, it becomes possible to sequentially select the current items to be detected.

When the set value determination unit 205b is pressed after the desired current item to be detected is selected, the arithmetic processing unit stores the current item to be detected, and the active cursor is again a large item “detection” Transition to "Method".

In addition, when Io is selected in the small item, as will be described later, a signal for breaking the breaker block 10 is not transmitted from the ground fault current detection block 20 side toward the breaker block 10 side. . When off is selected in the small item, the ground fault current detection block 20 stops its function, and no current detection processing is performed on the electric circuit.

When the detection method is set to Io, it is preferable that a sensitivity current described later is combined with a sensitivity current determined by a sensitivity changeover switch 108 provided on the circuit breaker block 10 side.

<Selection action>
Next, when the setting item selection unit 205a is pressed in this state, a mode for selecting the “operation” shown in FIG. 4 is entered. Subsequently, when the set value determination unit 205b is pressed, a mode for selecting “mode” and “time” which are small items is set. In FIG. 4, the mode is selected as alarm and the operation time is selected to be 0.3 seconds.

When the set value determination unit 205b is pressed, the active cursor changes to the “mode” (alarm / blocking / both) to be detected, which is a small item of the detection method, and the set item selection unit 205a is pressed. , Mode items can be selected sequentially.

When the set value determination unit 205b is pressed after the desired mode is selected, the arithmetic processing unit stores the mode item, and the active cursor changes to the “mode” which is a small item again. When the setting item selection unit 205a is pressed again in this state, the active cursor changes to the small item “time” (0.3 seconds / 3 seconds / custom), and the setting item selection unit 205a is pressed. By doing so, time items can be selected sequentially.

When the set value determination unit 205b is pressed after the desired time is selected, the arithmetic processing unit stores the time item, and the active cursor transitions to “mode” and “time”, which are small items again. . Subsequently, when the set value determination unit 205b is pressed, the arithmetic processing unit stores the operation item, and the active cursor is changed to the “operation” which is a large item again.

When “Custom” is selected in the “Time” item of the “Action” item, the time is displayed on the right side of the “Custom” display in the figure as shown in FIG. Using the set value increase unit 205c or the set value decrease unit 205d in 205, the time until the earth leakage breaker 1 operates can be freely set.

In this setting, the increase / decrease in time is set using the set value increasing unit 205c or the set value decreasing unit 205d of the operation unit 205. FIG. 5 shows a case where the time until operation is set to 5 minutes. After the setting, when the set value determination unit 205b is pressed, the arithmetic processing unit stores the operation item, and the active cursor changes to a “time” item as a small item. Further, when the set value determining unit 205b is pressed again, the active cursor is changed to the “action” item which is a large item.

<Selection sensitivity>
Next, in this state, when the setting item selection unit 205a is pressed, a mode for selecting "sensitivity" shown in FIG. 6 is entered. Subsequently, when the set value determination unit 205b is pressed, a mode for selecting the sensitivity for each detection target current (Io / Ior), which is a small item, is set.

As in the case of the “operation” item described above, the set item selection unit 205a and the set value determination unit 205b are used to select the desired sensitivity for each detection target current to be set, and then the set value. When the determination unit 205b is pressed, the arithmetic processing unit stores the sensitivity item for each current to be detected, and the active cursor again changes to “sensitivity”, which is a large item.

When “Custom” is selected in the “Io” and “Ior” items of the “sensitivity” item, the sensitivity current is displayed on the right side of the “custom” display, and the setting in the operation unit 205 is performed. By using the value increasing unit 205c or the set value decreasing unit 205d, the “sensitivity” can be freely set for each current to be detected of the leakage breaker 1.

In addition, with regard to the custom setting of sensitivity, priority is given to the current (Io or Ior) to be detected by the detection method selected in the detection method. When Io is selected as the detection method, it is preferable to match with the magnitude of the sensitivity current determined by the sensitivity changeover switch 108 on the circuit breaker block 10 side.

This is because, when Io is selected as the detection method, the ground fault current detection block 20 side does not send a signal for operating the circuit breaker block 10 toward the circuit breaker block 10, and the display unit 202 Since only the level display is performed at, if there is a difference between the sensitivity current setting value on the breaker block 10 side and the sensitivity current setting value on the ground fault current detection block 20 side, the actual breaking operation and level display This is because a difference occurs.

Then, after setting the three major items of the “detection method”, “sensitivity” of the current to be detected, and “operation” for setting the operation mode and the operation time to desired values, the set value When the determination unit 205b is pressed, the operation state is entered, and the display unit displays the detection target current as an operation factor of the above-described shut-off operation or operation for issuing an alarm,
Sensitivity current that displays the sensitivity current that is the operation threshold for the current to be detected;
A current level indicating a ratio of a current to be detected with respect to the sensitivity current;
The operation mode indicating the operation mode when the current to be detected reaches a predetermined magnitude (sensitivity current) is displayed, and information necessary for operation is displayed so that the user can visually recognize it.

Next, the internal processing procedure of the earth leakage circuit breaker 1 according to the present invention will be described with reference to FIGS. 7 and 8 are block diagrams showing the internal configuration of the earth leakage breaker 1 when the electric circuit is a single-phase three-wire system and a three-phase three-wire system, respectively. For reference, an internal processing algorithm in the earth leakage breaker 1 is also indicated by an arrow.

<Ground fault current detection means circuit>
<Single-phase three-wire system>
The internal block diagram shown in FIG. 7 is an earth leakage circuit breaker 1 when applied to a single-phase three-wire electric circuit. Between the circuit breaker block 10 and the ground fault current detection block 20, a power acquisition unit 301 and a zero are shown. The state where power and signals are transmitted and received via the phase current transformer output signal acquisition unit 302 and the ground fault current detection signal transmission unit 303 is shown.

The voltage phase of the electric circuit is L1 phase and L2 phase, and the neutral phase is N phase. 102 is a power supply side terminal of the earth leakage breaker 1, and 103 is a load side terminal of the earth leakage breaker 1. Reference numeral 104 denotes a contact opening / closing mechanism for turning on and off the electric circuit, which is provided inside the casing of the earth leakage breaker 1. Reference numeral 105 denotes second tripping means including a trip coil that acts on the contact opening / closing mechanism unit so as to perform an opening operation so that the contact opening / closing mechanism unit 104 performs an opening operation. In addition, when a predetermined current flows through the electric circuit, it includes a thermal element or an electromagnetic trip element that acts on the contact switching mechanism and performs a tripping operation so that the contact switching mechanism opens. The description of the first trip means is omitted.

The trip coil drives the plunger in a predetermined direction by electromagnetic induction by applying electric power. The second tripping means 105 is provided when a cutoff signal output from the cutoff signal output unit (SCRT) of the earth leakage IC 109 is input to the second tripping means driving means 106 configured using SCR. It is configured to drive.

The earth leakage IC 109 includes a zero-phase current transformer output signal input unit (ILK1) to which an output signal from the zero-phase current transformer 107 is input via the sensitivity changeover switch 108, and a ground fault current detection block 20 side. And a ground fault current detection signal input unit (IBL1) to which a ground fault current detection signal output via the ground fault current detection signal transmission unit 303 is input when a ground fault current is detected is provided. .

When the ground fault current detection signal is input to the ground fault current detection signal input unit (IBL1) of the ground leakage IC 109, the ground leakage IC 109 outputs a cutoff signal from the cutoff signal output unit (SCRT). Yes.

As a result, when the leakage current is detected on the circuit breaker block 10 side or when the ground fault current is detected on the ground fault current detection block 20 side, the interrupt signal output unit ( SCRT) outputs a cutoff signal.

One end (secondary side) of the second tripping means 105 (trip coil) is connected to the second tripping means driving means 106, and the other end (primary side) is connected to the electric circuit and the power source. Among the wirings connecting to the part 301, the power is supplied by being connected to the L1 phase in the figure.

The second tripping means 105 (trip coil) may be connected to the L2 phase instead of the L1 phase, or the L1 phase or the secondary side electric circuit of the contact switching mechanism 104 It may be configured by connecting to the L2 phase.

In the present embodiment, the second tripping means driving means 106 is constituted by the SCR (thyristor) as described above, from the interruption signal output section (SCRT) of the leakage IC 109 toward the gate of the SCR. , Conduction between the anode and the cathode is obtained by inputting a pulse signal of a predetermined high level. That is, electric power is supplied to the second tripping means 105, and the plunger is driven in a predetermined direction by electromagnetic induction.

In order to prevent the second tripping means 105 from continuing to operate due to the continued application of electric power to the second tripping means 105, the leakage current is inputted from the interruption signal input unit 710 of the microcomputer 2007. After a predetermined high level pulse signal is input to the IC 109, the low level is maintained. This is because if the second tripping means 105 continues to operate, the temperature of the winding of the trip coil rises and there is a risk of burning.

In order to determine whether the contact opening / closing mechanism 104 has been opened by the second tripping means 105, it is determined whether or not power is supplied to the secondary electric circuit of the contact opening / closing mechanism. Voltage detecting means for detecting is provided, and when the voltage detecting means no longer detects the voltage of the electric circuit, it is determined that the contact opening / closing mechanism section 104 has been opened, and the microcomputer 2007 has an interruption signal. You may comprise so that the output of the pulse signal of the predetermined high level from the input part 710 may be stopped.

Reference numeral 2008 denotes a power supply circuit that performs AC / DC conversion including a rectifier circuit for supplying power to various circuits such as the arithmetic processing circuit unit 2007. The power supply circuit 2008 obtains power from the electric circuit in the circuit breaker block 10 via the power acquisition unit 301, and in the electric circuit, on the secondary side of the contact switching mechanism unit 104 of the circuit breaker block 10, Connected to the L1 phase and the L2 phase to supply power. The connection to the electric circuit may be configured to perform rectification by connecting the N phase and the L1 phase, or the N phase and the L2 phase.

The aforementioned 107 is provided so as to penetrate the electric circuit in the circuit breaker block 10, and when a leakage current is generated in the circuit, an output signal (output current) having a magnitude corresponding to the leakage current is generated by electromagnetic induction. ) Is a zero-phase current transformer.

The output signal of the zero phase current transformer 107 is input from the circuit breaker block 10 to the ground fault current detection block 20 via the zero phase current transformer output signal acquisition unit 302. The zero-phase current transformer output signal acquisition unit 302 is constituted by a lead wire.

Reference numeral 2005 denotes a leakage current detection circuit, which includes a voltage signal converter that converts the output signal of the zero-phase current transformer 107 into a voltage signal, a differential amplifier that differentially amplifies the voltage signal, and an appropriate size. The level adjustment unit for level adjustment and the low-pass filter unit for removing high-frequency components are input to the arithmetic processing circuit unit 2007.

Reference numeral 2004 denotes a voltage phase detection circuit that is connected to the L1 phase and the L2 phase, which are voltage phases, and detects the voltage phase. The voltage phase detection circuit 2004 includes a differential amplifying unit that differentially amplifies the voltage signals in the L1 phase and the L2 phase, a low pass filter unit that removes a high frequency component of a voltage waveform obtained from the differential amplifying unit, The output obtained from the low-pass filter unit includes a rectangular wave generating unit that generates a rectangular wave whose high level / low level are inverted at the zero cross point of the voltage, and is input to the arithmetic processing circuit unit 2007.

<Determination of phase wire type>
Reference numeral 2006 denotes a phase wire type discrimination circuit for discriminating the phase wire type of the electric circuit, and it is determined whether the electric circuit on which the leakage breaker 1 is installed is a single-phase three-wire type or a three-phase three-wire type. It is a circuit for discriminating.

The phase line type discrimination circuit 2006 is connected to a phase that is not the voltage phase in the electric circuit (the N phase that is the ground phase in FIG. 7 and the V phase that is the ground phase in FIG. 8), and an input unit on the electric circuit side. Therefore, the voltage protection unit composed of a resistor and a diode for preventing circuit destruction due to reverse voltage, the output signal reversal prevention unit composed of a diode for preventing reverse rotation of the output signal, and a signal for phase and wire type discrimination A capacitor charging / discharging circuit composed of a capacitor for storing electricity and a resistor, and an output unit for outputting the output of the capacitor charging / discharging circuit (FIG. 13).

The output from the output unit is input to the arithmetic processing circuit. When the voltage on the voltage phase in the circuit is full-wave rectified and the negative voltage is the ground voltage, the voltage that is not the voltage phase, that is, the ground phase voltage, does not become negative in the case of a single phase. The output from the output unit is always positive (High level), and in the case of three phases, the output from the output unit is always zero (Low level). Can be determined to be a single-phase three-wire circuit when the output is at a high level, and when the output from the output unit is at a low level, it is a three-phase three-wire circuit.

2007 includes an input of an output signal output from the leakage detection circuit 2005, a voltage phase detection circuit 2004, a phase line type discrimination circuit 2006, an arithmetic processing based on an input of a setting signal output from the operation unit 205,
An arithmetic processing circuit unit that performs display control on the display unit 202 and notification control from the alarm signal output unit 203, and is configured using a microcomputer in this embodiment.

The arithmetic processing circuit unit 2007 includes a signal input / output unit, an input signal A / D conversion unit, a storage unit for storing data such as a program, an arithmetic processing unit, and the like.

Reference numeral 2008 denotes a power supply circuit that performs AC / DC conversion including a rectifier circuit for supplying power to various circuits such as the arithmetic processing circuit unit 2007. On the next side, it is connected to the L1 phase and the L2 phase at both ends of the electric circuit to supply power. The connection to the electric circuit may be configured to perform rectification by connecting the N phase and the L1 phase, or the N phase and the L2 phase.

<Three-phase three-wire type>
The internal block diagram shown in FIG. 8 is an earth leakage circuit breaker 1 when applied to a three-phase three-wire electric circuit. Between the circuit breaker block 10 and the ground fault current detection block 20, a power acquisition unit 301 and a zero are shown. A state in which power and signals are transmitted and received through the phase current transformer output signal acquisition unit 302 and the second trip means driving signal transmission unit 303 is shown.

The configuration of the circuit breaker block 10 is the same as that of FIG. 7 described above, and the connection to the electric circuit is such that the terminals at both ends of the power supply terminal 102 of the earth leakage circuit breaker 1 shown in FIG. The center terminal is connected to the V phase. In addition, when a predetermined current flows through the electric circuit, it includes a thermal element or an electromagnetic trip element that acts on the contact switching mechanism and performs a tripping operation so that the contact switching mechanism opens. The description of the first trip means is omitted.

The power acquisition unit 301 is connected to the primary side of the contacts that are opened and closed by the contact switching mechanism 104 in the figure, and each of the U phase, V phase, and W phase of each phase is connected.

The trip coil drives the plunger in a predetermined direction by electromagnetic induction by applying electric power. The second tripping means 105 is provided when a cutoff signal output from the cutoff signal output unit (SCRT) of the earth leakage IC 109 is input to the second tripping means driving means 106 configured using SCR. It is configured to drive.

The earth leakage IC 109 includes a zero-phase current transformer output signal input unit (ILK1) to which an output signal from the zero-phase current transformer 107 is input via the sensitivity changeover switch 108, and a ground fault current detection block 20 side. And a ground fault current detection signal input unit (IBL1) to which a ground fault current detection signal output via the ground fault current detection signal transmission unit 303 is input when a ground fault current is detected is provided. .

When the ground fault current detection signal is input to the ground fault current detection signal input unit (IBL1) of the ground leakage IC 109, the ground leakage IC 109 outputs a cutoff signal from the cutoff signal output unit (SCRT). Yes.

As a result, when the leakage current is detected on the circuit breaker block 10 side or when the ground fault current is detected on the ground fault current detection block 20 side, the interrupt signal output unit ( SCRT) outputs a cutoff signal.

One end (secondary side) of the second tripping means 105 (trip coil) is connected to the second tripping means driving means 106, and the other end (primary side) is connected to the electric circuit and the power source. Among the wirings connecting to the part 301, the power is supplied by being connected to the L1 phase in the figure.

The second tripping means 105 (trip coil) may be connected to the L2 phase instead of the L1 phase, or the L1 phase or the secondary side electric circuit of the contact switching mechanism 104 It may be configured by connecting to the L2 phase.

In the present embodiment, the second tripping means driving means 106 is constituted by the SCR (thyristor) as described above, from the interruption signal output section (SCRT) of the leakage IC 109 toward the gate of the SCR. , Conduction between the anode and the cathode is obtained by inputting a pulse signal of a predetermined high level. That is, electric power is supplied to the second tripping means 105, and the plunger is driven in a predetermined direction by electromagnetic induction.

In order to prevent the second tripping means 105 from continuing to operate due to the continued application of electric power to the second tripping means 105, the leakage current is inputted from the interruption signal input unit 710 of the microcomputer 2007. After a predetermined high level pulse signal is input to the IC 109, the low level is maintained. This is because if the second tripping means 105 continues to operate, the temperature of the winding of the trip coil rises and there is a risk of burning.

In order to determine whether the contact opening / closing mechanism 104 has been opened by the second tripping means 105, it is determined whether or not power is supplied to the secondary electric circuit of the contact opening / closing mechanism. Voltage detecting means for detecting is provided, and when the voltage detecting means no longer detects the voltage of the electric circuit, it is determined that the contact opening / closing mechanism section 104 has been opened, and the microcomputer 2007 has an interruption signal. You may comprise so that the output of the pulse signal of the predetermined high level from the input part 710 may be stopped.

Reference numeral 2008 denotes a power supply circuit that performs AC / DC conversion including a rectifier circuit for supplying power to various circuits such as the arithmetic processing circuit unit 2007. On the next side, it is connected to the U-phase and W-phase at both ends of the electric circuit to supply power. The connection to the electric circuit may be configured to perform rectification by connecting to the V phase and the U phase, or the V phase and the U phase.

<Ground fault current detection means Detection method>
Next, a method for detecting a ground fault current when the detection method is Ior will be described step by step.

In this example, as an element used for obtaining the ground fault current,
As external elements, voltage phase data in the electric circuit, leakage current data detected by the zero-phase current transformer 107, and phase line type discrimination data of the electric circuit are used.
Further, in the earth leakage circuit breaker 1 as an internal element, when performing synchronous calculation using the external element, individual circuit characteristics such as the voltage phase detection circuit 2004, the earth leakage current detection circuit 2005, and the arithmetic processing circuit unit 2007, respectively. Using the phase correction value for correcting the phase shift from the reference value and the sine wave data whose effective value is 1
The ground fault current is obtained by calculation processing.

<Single-phase three-wire detection method>
First, the case where the electric circuit is a single-phase three-wire system will be described with reference to FIG.

In the arithmetic processing circuit unit 2007, as information from the electric circuit,
Voltage conversion signal data of a leakage current input from a leakage current detection circuit 2005 for converting a leakage current obtained from the zero-phase current transformer 107 into a voltage signal;
Phase wire type discrimination data input from the phase wire type discrimination circuit 2006;
The rectangular wave signal data of the circuit voltage input from the voltage phase detection circuit 2004 is input.

In the arithmetic processing circuit unit 2007, the following steps are executed.
A / D conversion of the voltage conversion signal data of the leakage current input from the leakage current detection circuit 2005 by A / D conversion unit 701 into digital data at predetermined time (step S001),

In addition, using the rectangular wave input from the voltage phase detection circuit 2004, a step of setting the zero cross point of the rising edge of the rectangular wave to the basic start timing (θ) of calculation (step S002),

Further, the phase correction value (δ) is read from the phase correction value storage unit 704, and the phase correction value (δ) is read.
Shifting the minute from the basic start timing of the calculation (θ + δ) step (step S003),

When the electric circuit is a single-phase three-wire system, that is, when the signal input from the phase-wire system discrimination circuit 2006 is at a high level, the delay data in the time delay setting unit 703 in the figure is set to 0 (zero degree). The delay data (0) is added to the timing shifted by the phase correction value (δ) from the basic start timing (θ) of the calculation (θ + δ + 0) to obtain the calculation start timing (step S004),

A step of reading the sine wave data having the effective value of 1 from the sine wave data storage unit 702 (step S005);

A step of multiplying the voltage conversion signal data of the leakage current A / D converted by the A / D conversion unit 701 by the multiplication unit 705 with the sine wave data (step S006),

A step of averaging one period of the waveform obtained as a result of the multiplication in the average value calculation unit 706 (step S007),

In the level determination unit 709, the sensitivity current data is read from the set value data from the set value storage unit 708, and the average value of one cycle obtained in step S007 is compared with the set sensitivity current data. A level determination step (step S008) for determining that a ground fault current has occurred when the sensitivity current data has been reached;

When the time determination unit 709 determines that a ground fault current has occurred in the level determination unit 709, it reads out time data and operation data from the set value data from the set value storage unit 708. If the ground fault current is generated continuously for the data and the cutoff operation is set in the operation mode, the leakage current IC 109 is supplied from the cutoff signal output unit 710 via the ground fault current detection signal transmission unit 303. The step of outputting a cut-off signal to the ground fault current detection signal input unit (IBL1) (step S009).

The second tripping means driving means 106 is driven when a cutoff signal is input from the cutoff signal output unit (SCRT), whereby a voltage is applied to the second tripping means 105. The contact opening / closing mechanism 104 is tripped to open the contact (step S010).

When the contact opening / closing mechanism 104 is tripped and the contact is opened, a step of stopping the output signal from the interruption signal output unit 710 (step S011)

If the alarm mode is set in the operation mode, a step (step S012) of outputting an alarm signal output unit 203 notification signal is executed.

As described above, the sine wave data stored in the arithmetic processing circuit unit 2007 is converted into a sine wave data having an effective value of 1 in advance at predetermined time intervals and stored in the sine wave data storage unit 702. Yes. In the case of this embodiment, in order to detect a ground fault current more accurately, one cycle of sine wave data is divided into 256 points and converted into data, and the amplitude value of the sine wave corresponding to the division point is stored. I am letting. The number of division points is, for example, 128 divisions for simpler detection, depending on the capability of the arithmetic processing circuit unit and the storage capacity, and depending on the desired accuracy, and for more precise detection. It may be determined appropriately such as 512 divisions.

In addition, the alarm signal output unit 203 described above is configured such that the terminals in the figure are closed when a ground fault current is detected.

These notified alarm signals can be stopped by pressing a reset button 2004, and a stop signal is input to the arithmetic processing circuit unit 2007.

<Detection of leakage current>
In the earth leakage breaker 1, when the detection method is set to Io, the earth leakage current is detected by both the earth leakage IC 109 of the circuit breaker block 10 and the arithmetic processing circuit unit 2007 of the ground fault current detection block 20. However, the leakage operation is determined by the earth leakage IC 109, and the ground fault current detection block 20 only displays the level of the leakage current with respect to the sensitivity current value and performs an alarm operation according to the alarm mode. No cut-off signal is sent to

In this case, the arithmetic processing circuit unit 2007 does not execute the step (step S006) of multiplying the voltage conversion signal data of the leakage current by the sine wave data, and obtains an average value of one cycle as it is, By comparing with the sensitivity current data set in advance, level display and appropriate alarm action are performed.

<Level display on display>
Note that the arithmetic processing circuit unit 2007 performs display control on the display unit 202, and a sensitivity set in advance for the value of the ground fault current or the leakage current obtained by the average value calculation unit 712 described above. Calculate the ratio of the current value to the data, and display the level step by step.

In this embodiment, as shown in FIG. 1, four levels are displayed, and each level is less than 25%, 25% to 50%, 50% to 75%, 75 % Or more. For example, when the magnitude of the detected ground fault current is about 30% of the sensitivity current, two level displays are lit from the left in the figure.

Further, when the voltage detection means provided in the secondary side electric circuit of the contact switching mechanism 104 described above no longer detects the voltage of the electric circuit, or the interruption signal is output from the interruption signal output unit 710 of the microcomputer 2007. In this case, the microcomputer 2007 internally stores information on the ground fault current or leakage current generated in the electric circuit immediately before that, and the display control unit 711 generates the information in the electric circuit immediately before the display unit 1002. The information on the ground fault current or earth leakage current is displayed.

As a result, even when the electric circuit is interrupted, the information on the ground fault current or the leakage current generated in the electric circuit immediately before the interruption can be recognized by the display unit 1002, and the circuit breaker is turned on unnecessarily. It is possible to prevent the risk of undue damage.

In addition, even when the power supply is cut off, it is possible to recognize whether the grounding current or leakage current is in the circuit without having to provide a separate power supply. The risk of throwing in can be reduced.

In this embodiment, the liquid crystal drive control of the display unit 202 is performed by the display control unit 711 of the arithmetic processing circuit unit 2007. However, the circuit may be configured using a separate liquid crystal drive circuit.

<Three-phase three-wire detection method>
Next, the case where the electric circuit is a three-phase three-wire system will be described with reference to FIG.
In the case of the three-phase three-wire system, the data input from the phase-wire type discrimination circuit 2006 to the arithmetic processing circuit unit 2007 is different from that in the case of the single-phase three-wire system.

As described above, in the case of the three-phase three-wire system, a low-level signal is output from the phase-wire type discrimination circuit 2006 to the arithmetic processing circuit unit 2007.

In the case of a three-phase three-wire system, when the arithmetic processing circuit unit 2007 receives a low level signal from the phase / wire type discriminating circuit 2006, the delay data in the time delay setting unit 703 is converted to π / 2 (90 The delay data is further shifted (θ + δ + π / 2) to a timing (θ + δ) shifted by the phase correction value (δ) from the calculation start timing (θ) (θ + δ + π / 2), and the calculation is started as the calculation start timing ( Step S004 ').

Other detection steps are the same as in the case of the single-phase three-wire system described above.

As described above, regardless of whether the circuit is the single-phase three-wire system shown in FIG. 7 or the delta-connected three-phase three-wire system shown in FIG. It is possible to detect a leakage current or a leakage current.

However, when the earth leakage circuit breaker 1 of the present invention is installed in a star-connected three-phase three-wire circuit, when the ground fault current is obtained, the reference first phase is determined. Since it is difficult to obtain the detection accuracy of the ground fault current in the other two phases, the ground fault current Ior is not detected even when the detection method is set to Ior.

(Second Embodiment)
<Appearance of earth leakage breaker>
FIG. 9 shows an external configuration of the earth leakage circuit breaker according to the second embodiment. Compared to the earth leakage breaker shown in Fig. 1, this earth leakage breaker 1 uses an LED display instead of a liquid crystal display and push button type operation unit for the configuration of the information display operation section, and a mechanical type selection. It differs in that it is configured using a switch of the formula.

In the connection between the circuit breaker block 10 and the ground fault current detection block 20, the connection of the above-described zero-phase current transformer output signal acquisition unit 302 is the circuit breaker block 10 side in the case of the first embodiment. However, in the present embodiment, as shown in FIG. 19, it is connected to the subsequent stage of the sensitivity changeover switch 109 on the circuit breaker block 10 side. ing.

Thus, the sensitivity current setting value determined on the circuit breaker block 10 side can be used as it is on the ground fault current detection block 20 side, and the sensitivity current setting on the circuit breaker block 10 side and the ground fault current detection block 20 side can be used. Convenience is enhanced because it is not necessary to match the values.

In this case, on the ground fault current detection block 20 side, the magnitude of the leakage current and the ratio of the magnitude of the ground fault current to the sensitivity current set value are obtained by appropriate calculation.

In the ground fault current detection block 20 side in the earth leakage circuit breaker 1 shown in FIG.
As an operation part,
A dial type operation unit (detection method operation unit) 205a for selectively selecting a detection method;
A slide-type operation unit (operation time operation unit) 205b that selectively switches the operation time.
Moreover, as a display part,
A level display unit 202a is provided for level-displaying the ratio of the magnitude of the ground fault current or leakage current in the electric circuit determined by the detection method with respect to the sensitivity current in a stepwise manner.

These operation unit and display unit are connected to an input / output port provided in the arithmetic processing circuit unit 2007, and the setting in the operation unit results in a difference in voltage value at the input port of the arithmetic processing circuit unit 2007. Is input. Further, in the level display unit 202a, the LED indicating the level is turned on / off in a stepwise manner in accordance with the ratio of the detection target current obtained by the arithmetic processing circuit unit 2007 by the calculation.

The dial type operation unit 205a for selectively switching the detection method is:
Two states of Ior for detecting a ground fault current and Io for detecting a leakage current can be alternatively selected.

The slide type operation unit 205b that selectively switches the operation time is as follows.
An item of 0.3 seconds can be selected alternatively for immediate operation, or 3 seconds for time delay operation.

Further, on the circuit breaker block 10 side, a slide type operation unit (sensitivity setting operation unit) 105 for selectively switching the sensitivity current is provided.

The slide type operation unit 205c that selectively switches the sensitivity current is as follows.
The detection sensitivity for the detection target current selected in the selection method selection operation unit 105 is set.
When the detection method is Io, the items of 100 mA with high sensitivity, 200 mA with medium sensitivity, and 500 mA with low sensitivity can be selected alternatively.
Further, when the detection method is Ior, it is possible to alternatively select an item of 30 mA having a high sensitivity, a medium 60 mA, and a 150 mA having a low sensitivity.

Based on the various setting values set in this way, the arithmetic processing circuit unit 2007 performs arithmetic processing for each step described above, and obtains the detection target current set by the detection method.

The level display unit 202a is configured to display four levels, and each level is divided into less than 25%, 25% to 50%, 50% to 75%, 75% or more. ing. For example, when the magnitude of the detected current is about 30% of the sensitivity current, two level displays are lit from the bottom in the figure.

The detection method display unit 202b is composed of LEDs so as to turn on and display the detection method set by the detection method operation unit 205a, and it is possible to visually determine which detection current the level display is for. It is easy to catch.

When the detected current reaches the sensitivity current set by the sensitivity setting operation unit 105 and the operation time set by the operation time operation unit 205b has elapsed, a predetermined alarm notification and alarm signal are output. Is output.

In the second embodiment shown in FIG. 9, means for switching the operation mode in the earth leakage breaker 1 is not provided. For this reason, the alarm mode, which is an operation mode, is configured to perform stepwise control from the arithmetic processing circuit unit 2007, and in conjunction with the level display unit 202a, if it exceeds 50%, the voice is output. “Ior's current level is now 50%. Please be careful.”, If it exceeds 75%, “Ior's current level is now 75%. If it exceeds%, an alarm will be issued to alert the surroundings that the current level of Ior will soon become a sensitivity current. At the same time, an alarm signal is output from the alarm signal output unit.

<Third Embodiment>
An external configuration of the circuit breaker 1 according to the third embodiment is shown in FIG. In the present embodiment, the circuit breaker block 10 is configured using a circuit breaker having a cassette attachment device insertion portion 12 into which a cassette attachment device as shown in FIG. 17 can be inserted.

A power supply side terminal 102 and a load side terminal 103 connected to the electric circuit are provided outside the casing of the circuit breaker block 10, and the electric circuit is turned on and off inside the casing of the circuit breaker block 10. A contact opening / closing mechanism portion, an operation handle 101 for driving a portion of the contact opening / closing mechanism portion that is exposed to the outside of the housing, and when a predetermined current such as an overcurrent flows through the electric circuit, the contact point A first trip means comprising a thermal element or an electromagnetic trip element acting on the opening / closing mechanism and performing a tripping operation so that the contact opening / closing mechanism performs an opening operation; and receiving a predetermined operation signal. A second tripping means comprising a trip coil that performs a tripping operation so that the contact opening / closing mechanism performs an opening operation, a leakage current detection means that detects a leakage current in the circuit,
Is provided.

Further, a cover covering the ground fault current detection block 20 provided in the shape of the cassette accessory device is partially formed on a transparent panel so that the display part of the ground fault current detection block 20 can be visually recognized from the outside. It is composed.

Further, the ground fault current detection block 20 is configured to be inserted into the cassette attachment device insertion portion, and has an external appearance. By inserting into the cassette attachment device insertion portion, the ground fault current detection block 20 is connected to the breaker block 10. Therefore, it is possible to detect the ground fault current in the electric circuit.

The ground fault current detection block 20 in this embodiment includes
A ground fault current detection means for detecting a ground fault current component in the electric circuit, and when a ground fault current of a predetermined magnitude is detected by the ground fault current detection means, toward the leakage IC 109 of the leakage current detection means A ground fault current detection signal transmission unit for outputting a predetermined operation signal,
As in the previous embodiment, a power source acquisition unit 301, a zero-phase current transformer output signal acquisition unit 302, and a ground fault current detection signal transmission unit 303 are provided. These power source acquisition unit, zero-phase current transformer, A hole for drawing out or drawing in the output signal acquisition unit and the ground fault current detection signal transmission unit is provided in the cassette attachment device insertion unit and the ground fault current detection block 20 of the circuit breaker block 10.

The ground fault current detection block 20 includes an alarm display signal when a ground fault current of a predetermined magnitude is detected by the information display operation unit 201 that can be operated or visually recognized from the outside of the housing and the ground fault current detection means. Is output to the outside.

The information display operation unit 201 is provided with a display unit 202 for displaying various information, an operation unit 205 for setting operation conditions of the circuit breaker, and a reset unit 204 for stopping an alarm. The same operation as in the first embodiment is performed.

It should be noted that the present invention is not limited to the disclosed embodiments, and can be freely improved and changed in design as necessary, without departing from the spirit of the invention.
<Indication of leakage warning>
For example, in order to prevent the leakage current in the circuit from reaching the sensitivity current, and to notify the user that the leakage current has increased in the circuit in order to prevent an unnecessary operation of the circuit breaker and an unnecessary alarm from being notified. In addition, a leakage current caution display means may be provided in the display unit 202.

For example, when the leakage current calculated by the arithmetic processing circuit unit 2007 reaches 50% of the sensitivity current determined by the sensitivity setting operation unit 205c, the leakage current caution display means It is good to operate.

As a result, the user can recognize that the leakage current is generated at least 50% of the sensitivity current in the electric circuit, and the unnecessary operation of the circuit breaker and the unnecessary alarm due to the leakage are notified in advance. Can be prevented. In addition, it is also useful to provide time to take appropriate measures and alert attention before an accident associated with electric leakage occurs.

It is to be noted that the operation of the leakage current caution display means is configured so that the calculation processing circuit unit 2007 always obtains the calculation regardless of whether the detection target current of the detection method is Io or Ior. Good.

<Parallelization of arithmetic processing circuit>
For example, as the arithmetic processing circuit unit 2007, using a microcomputer provided with a plurality of A / D conversion units, an arithmetic process for obtaining Ior and Io in parallel is performed,
It is preferable to perform time division in the course of the arithmetic processing and perform arithmetic processing so as to alternately obtain Ior and Io at each time division point.

FIG. 10 shows a leakage current caution display when the display unit is composed of liquid crystal, and FIG. 11 shows an example of a leakage current caution display when the display unit is composed of LEDs.
In FIG. 10, the arithmetic processing circuit unit 2007 causes the “Io attention” display to be black and white inverted and blinking.
Further, in FIG. 11, the arithmetic processing circuit unit 2007 displays an LED clearly indicating Io attention. It may be displayed blinking.

Further, as shown in FIG. 14 and FIG. 15, as a warning signal, a speaker unit 2008 is provided in the ground fault current detection block 20 to reproduce audio data stored in advance in the arithmetic processing circuit unit 2007. You may comprise so that an audio | voice warning may be alert | reported. In addition to the voice processing, it may be configured to simply notify the buzzer sound.

Further, as shown in FIG. 14 and FIG. 15, as a warning signal, a speaker unit 2008 is provided in the ground fault current detection block 20 to reproduce audio data stored in advance in the arithmetic processing circuit unit 2007. You may comprise so that an audio | voice warning may be alert | reported. In addition to the voice processing, it may be configured to simply notify the buzzer sound.

In the second embodiment shown in FIG. 9, means for switching the operation mode in the circuit breaker block 10 is not provided. For this reason, the alarm mode, which is the operation mode, is configured to perform stepwise control from the arithmetic processing circuit unit 2007, and in conjunction with the level display unit 202a, if it exceeds 50%, it is sounded. "The current level of Ior has reached 50%. Please be careful.", If it exceeds 75%, the current level of Ior has become 75%. It may be configured so that an alarm such as “Ior's current level will soon become a sensitivity current. Cut off. Be careful.” To alert the surroundings.

Further, the connecting means shown in FIG. 18 may be configured to be connected using a double-sided tape or the like by using an adhesive means or an adhesive means as a simpler one.

The connection position when the ground fault current detection block 20 is connected to the circuit breaker block 10 is not only the left side as shown in the previous embodiment, but also the connection on the right side, You may comprise so that it may connect on the power supply side terminal side or the load side terminal side. In addition, when connecting on the power supply side terminal side or the load side terminal side, the ground fault current detection block 20 can be fixed by connecting so as to connect to the terminal screw portion.

The present invention can be used as an earth leakage circuit breaker used in a residential distribution board or the like interposed in the electric circuit instead of the earth leakage circuit breaker that has been widely used conventionally. It prevents unnecessary operations due to leakage current components and protects against fires and electric shocks caused by ground fault currents.

The figure which shows the external appearance structure at the time of operation | movement of the earth-leakage circuit breaker by 1st Embodiment. The figure which shows the external appearance structure at the time of the confirmation of the earth-leakage circuit breaker by 1st Embodiment The figure which shows the external appearance structure at the time of the setting of the earth-leakage circuit breaker by 1st Embodiment The figure which shows the external appearance structure at the time of the setting of the earth-leakage circuit breaker by 1st Embodiment The figure which shows the external appearance structure at the time of the setting of the earth-leakage circuit breaker by 1st Embodiment The figure which shows the external appearance structure at the time of the setting of the earth-leakage circuit breaker by 1st Embodiment The figure which shows the block block diagram of the earth-leakage circuit breaker by 1st Embodiment. The figure which shows the block block diagram of the earth-leakage circuit breaker by 1st Embodiment. The figure which shows the external appearance structure at the time of operation of the earth-leakage circuit breaker by 2nd Embodiment. Example of electric leakage warning display Example of electric leakage warning display Illustration of the operation unit Example of phase wire discrimination circuit Other applications Other applications The figure which shows the external appearance structure of the earth-leakage circuit breaker by 3rd Embodiment. The figure which shows the external appearance structure of the earth-leakage circuit breaker by 3rd Embodiment. The figure which shows the connection means of a ground-fault current detection block and a circuit breaker block The figure which shows the block block diagram of the earth-leakage circuit breaker by 2nd Embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground fault circuit breaker 101 Handle 102 Power supply side terminal part 103 Load side terminal part 104 Contact switching mechanism part 105 Trip coil 106 Second trip means drive means 107 Zero phase current transformer 701 A / D conversion part 702 Sine wave data storage Unit 703 time delay setting unit 704 phase correction value setting unit storage unit 705 multiplication unit 706 average value calculation unit 707 level determination unit 708 setting value storage unit 709 time determination unit 710 second trip means driving means 711 display control unit 201 information Display operation unit 202 Display unit 203 Alarm signal output unit 204 Reset unit 205 Operation unit 206 Speaker unit 2004 Voltage phase detection circuit 2005 Leakage current detection circuit 2006 Phase wire type discrimination circuit 2007 Arithmetic processing circuit unit

Claims (4)

Current that flows to the ground due to poor insulation in AC circuits and facilities, and current that flows to ground due to poor insulation in the AC circuits and facilities, etc. A ground fault current detecting means for detecting the ground fault current,
When the ground fault current of a predetermined magnitude is detected by the ground fault current detecting means, it acts on the contact opening / closing mechanism section that turns on and off the electric circuit of the circuit breaker interposed in the electric circuit, and the contact is opened. A tripping means,
Sensitivity current setting means for variably setting the magnitude of the ground fault current detected by the ground fault current detection means;
Display means for displaying a ratio of the magnitude of the currently occurring ground fault current to the ground fault current of the predetermined magnitude set by the sensitivity current setting means,
And a first trip means that, when a predetermined current flows through the contact opening / closing mechanism and the electric circuit, performs a tripping action so that the contact opening / closing mechanism is opened. And a second trip means comprising a trip coil that operates in response to a predetermined operation signal and performs a tripping operation so that the contact switching mechanism performs an opening operation,
A circuit breaker block comprising a leakage current detecting means for detecting a leakage current in the electric circuit;
A ground fault current detecting means for detecting a ground fault current in the electric circuit, the sensitivity current setting means, the display means,
And a ground fault current detection block equipped with a connecting means,
In the circuit breaker block, a zero-phase current transformer provided so as to penetrate the electric circuit,
The ground-fault current detection means block includes at least a power acquisition unit connected to the primary side of the contact in the circuit breaker block for acquiring power, and acquisition of an output signal obtained from the zero-phase current transformer. When a ground fault current of a predetermined magnitude is detected by the zero-phase current transformer output signal acquisition unit to be performed and the ground fault current detection means, a ground operation signal is output to the leakage current detection means. And a fault current detection signal transmitter.
Through the power acquisition unit, the zero-phase current transformer output signal acquisition unit, and the ground fault current detection signal transmission unit, power and signals are transmitted and received between the circuit breaker block and the ground fault current detection block. An earth leakage circuit breaker characterized by that. In the ground fault current detection means block, an operation mode to be taken by the earth leakage breaker when a ground fault current having a predetermined magnitude is detected by the ground fault current detection means is selected from the predetermined operation modes. 2. A selection means is provided, and the operation mode includes at least an alarm mode for outputting an alarm signal from an alarm signal output unit and a notification unit provided in the earth leakage circuit breaker. Earth leakage circuit breaker. The current to be detected as the operating factor of the circuit breaker in the circuit or the operation of issuing an alarm
Current that flows to the ground due to poor insulation of AC circuits and facilities, and leakage current that includes current that flows from the charging section of the AC circuits and facilities to the ground, or current that flows to ground due to insulation defects of the AC circuits and facilities Selection means for selecting from among the ground fault currents,
Detection target current detection means for detecting the detection target current selected by the selection means;
When the current to be detected is detected by the current detection means to be detected, it acts on the contact opening / closing mechanism for turning on and off the electric circuit of the earth leakage breaker, and the contact is opened. A tripping means,
Sensitivity current setting means for variably setting the magnitude of the detection target current detected by the detection target current detection means;
Display means for displaying the ratio of the magnitude of the ground fault current currently generated with respect to the current of the detection target of the predetermined magnitude set by the sensitivity current setting means,
And a first trip means that, when a predetermined current flows through the contact opening / closing mechanism and the electric circuit, performs a tripping action so that the contact opening / closing mechanism is opened. And a second trip means comprising a trip coil that operates in response to a predetermined operation signal and performs a tripping operation so that the contact switching mechanism performs an opening operation,
A circuit breaker block comprising a leakage current detecting means for detecting a leakage current in the electric circuit;
A detection target current detection block comprising: a detection target current detection means for detecting a detection target current in the electric circuit; the sensitivity current setting means; and the display means;
The circuit breaker block is provided with a zero-phase current transformer provided so as to penetrate the electric circuit, and the current detection means block to be detected includes at least the circuit breaker block. A power acquisition unit connected to the primary side of the contact for acquiring a power source, a zero phase current transformer output signal acquisition unit for acquiring an output signal obtained from the zero phase current transformer, and a current detection of the detection target A ground fault current detection signal transmission unit that outputs a predetermined operation signal toward the leakage current detection means when a current of a predetermined magnitude is detected by the means;
Through the power acquisition unit, the zero-phase current transformer output signal acquisition unit, and the ground fault current detection signal transmission unit, transmission and reception of power and signals between the circuit breaker block and the current detection block to be detected are performed. An earth leakage circuit breaker characterized by performing. The current detection means block to be detected includes an operation mode to be taken by the earth leakage breaker when the current detection means having a predetermined magnitude is detected by the current detection means to be detected. The operation mode is configured to include at least an alarm mode for outputting an alarm signal from an alarm signal output unit and a notification unit provided in the earth leakage circuit breaker. Item 3. The earth leakage circuit breaker according to item 3.

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