JP5354620B2 - Circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circuit breaker which can prioritize set values determined by an operation reference current value setting section to perform setting of operation reference current values with flexibility in the cases where a work is carried out in the presence of a resident in an inspection of a distribution board, where a worker does not have a current value setting controller, and the like. <P>SOLUTION: A circuit breaker 1 for performing a predetermined time limit characteristic control when a magnitude of load current in multiple-phase electric lines 10 is detected by current transformers 105 and 106 and when a vector synthesis of load current in the electric lines 10 is larger than a predetermined operation reference current value, comprises a first operation reference current value setting section having a radio signal transmitting/receiving section 301 for performing radio communication of operation reference current value data with a current value setting controller 302, and a second operation reference current value setting section for selectively switching and setting the operation reference current values. The determined operation reference current values are prioritized. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

The present invention relates to a circuit breaker in which an operation reference current value is variably set, and in particular, detects a magnitude of a load current in a multi-phase electric circuit with a current transformer, and a predetermined operation reference current value and In comparison, when the vector combined sum of the load currents flowing through the electric circuit is large, the present invention relates to a circuit breaker having a function of performing predetermined time limit characteristic control.

In recent years, electrical appliances such as air conditioners, washing / drying machines, and hot-water washing toilet seats have become popular in general households, and it is necessary to install dedicated circuits as wiring circuits for supplying electricity to these appliances. The number of branch circuits provided in the board tends to increase.

When the number of branch circuit increases, the direction of the magnitude of parallel branch circuit breaker is increased in the distribution board for accommodating the branch circuit breaker, to come out constrained to secure installation space in a residential Is concerned. In view of such a point, for example, as disclosed in Patent Document 1, development has been made to make the body of the branch circuit breaker compact.

Further, the distribution board, in addition to the branch circuit breaker described above, the main circuit breaker for distributing power to the branch circuit breaker, and, in the cases specified power company in accordance with the contract current with the user Generally, a current limiter having a predetermined breaking current is provided (Patent Document 2).

Now, the distribution board, in addition to the branch circuit breaker described above, the main circuit breaker for distributing power to the branch circuit breaker, and the current limiter breaking current is determined according to the contract current provided thing is common to be, in the distribution board, when providing both of the main circuit breaker and current limiter, the size of the arrangement direction of the circuit breaker of the distribution board becomes larger As the number of branch circuit breakers increases, there is a problem that the installation space in the house is limited, and for the distributor of the distribution board, the current limiter and providing the installation unit distribution board, the current limiter installed unit distribution board of two types of distribution board development, it is necessary to produce not provided the distribution board corresponding to various branch circuits number When assorting products, simply double the number depending on the presence / absence of the current limiter Because there are various types of distribution boards, there are problems such as development costs, manufacturing costs, and various costs such as inventory management of many peripheral parts such as connecting wire connection terminals and packing materials. In view of this, the applicant can unify the size of the distribution board regardless of whether or not the current limiter is necessary, and for the user, the size of the circuit board breaker in the juxtaposed direction can be increased. The compactness can reduce the installation space constraints, and for the supplier side, it is possible to halve the types of distribution boards, which can reduce costs such as development costs, manufacturing costs, inventory management, etc. A circuit breaker that can protect the wiring from overcurrent associated with the use of load equipment and control the load current according to the contract current defined between the power company and the user It is doing the invention.

Japanese Patent Laid-Open No. 2001-15007 FIG. JP 2006-81296 A FIG.

By the way, when the electric power company defines the current limiter, it is agreed to install a current limiter in the distribution board installed in the user's residence, which shuts off with an amperage corresponding to a predetermined contract current. . The current limiter performs a breaking operation based on a contract current as compared with a main switch provided to protect the wiring in the first place, and generally the distribution board with respect to a load current in an electric circuit than the main switch provided within, in order to perform an operation quickly, by the user, it said current limiter is in some cases added to a tampering not to perform cutoff operations.

For example, there is a risk that the current limiter will not operate even when a predetermined load current is used by bypassing the same-polarity power terminals on the primary side and secondary side of the current limiter with wires. It was. Such bypass wire, the like if the inspector in an electric equipment inspection to inspect the distribution board, by previously removed beforehand, difficult to grasp is tampering, also small current capacity accidentally wire In the case of being bypassed using a wire, there is a problem that the electric wire generates abnormal heat and may cause an electric fire.

Also, the current limiter has a single cut-off current according to the contract current. When the user changes the contract current, the current limiter already installed in the distribution board It was necessary to replace the device with a current limiter corresponding to the contracted current capacity, and there was a problem that the labor involved in the replacement work was great. In other words, when replacing the current limiter in accordance with the change in the contract current, it is replaced after opening the panel of the distribution board, or the current setting unit provided in the circuit breaker (the circuit breaker operates) When operating the operation reference current value setting unit), it is necessary to perform the operation after opening the panel of the distribution board. Therefore, and if resident is absent, such as when the attendance of convenience can not be taken, the work schedule due to a change of the contract current necessary to adjust the cause, there is a problem that working efficiency relating to the work is significantly deteriorated It was.

Accordingly, the object of the present invention has been made in view of the above-described problems, and it is possible to set the operation reference current value without using a tool such as a driver, and to determine whether the occupant is present or absent. While it is not necessary to adjust the schedule, it can be easily performed with good workability, and it can be easily confirmed whether the contract current value negotiated between the power company and the user is set correctly. When the work is performed in the presence of a resident, such as when checking the distribution board, or when the current value setting controller is not carried by the worker, the setting value determined by the operation reference current value setting unit is set. It is an object of the present invention to provide a circuit breaker that can set an operation reference current value with priority and more flexibility.

In order to achieve the above-mentioned object, according to claim 1 of the present invention, the first and the second detecting the magnitude of the load current provided respectively through the first phase and the second phase in the multi-phase electric circuit. second current transformer and (CT), a switching mechanism for turning on and off the interposed the path to the path, manually operating the switching mechanism so as to be operated from the vessel outside in conjunction with the opening and closing mechanism When a predetermined current flows through the operation handle, a tripping means including a thermal element and an electromagnetic trip element that act on the opening / closing mechanism section to perform a tripping action, and an action on the opening / closing mechanism section A trip coil (TC) that operates in response to a predetermined operation signal, and a load current value flowing in the electric circuit are detected by the first and second current transformers (CT), and the current transformer (CT) The computing means connected to the first Storage unit for receiving the output signal from the second current transformer (CT) and calculating the vector sum of the output signals to obtain the combined load current value of the entire electric circuit in the first phase and the second phase When the load current value is larger than the operation reference current value, predetermined time-limit characteristic control is performed and the trip coil (TC) is operated. An operation control unit including the storage unit for outputting a signal and detaching the opening / closing mechanism unit, and a composite load current value of the entire electric circuit for operating the trip coil (TC) as a current setting unit for determining a threshold value of the operation reference current value variable, is connected to the operation control unit, and the operation reference current value information input unit for inputting the operation reference current value, including the operation reference current value information Data arrangement An information transmitter for wirelessly transmitting operation reference current value reading start data for reading operation reference current value information set in the circuit breaker, and the circuit breaker side in response to transmission of the operation reference current value reading start data A first wireless signal transmission / reception unit that wirelessly communicates with a current value setting controller including an information receiving unit that receives data including operation reference current value information to be returned and wirelessly transmits and receives operation reference current value data. A circuit breaker comprising: an operation reference current value setting unit; and a second operation reference current value setting unit that is connected to the operation control unit and selectively switches and sets the operation reference current value, The operation reference current value determined by the first operation reference current value setting unit and the second operation reference current value setting unit is stored in the storage unit of the operation control unit, while the determined operation reference current value is A circuit breaker is provided in which a priority is provided.

According to the present invention, when the work is performed in the presence of a resident such as when checking the distribution board, or when the operator does not have the current value setting controller, the operation reference current value setting unit There is an effect that it is possible to provide a circuit breaker that can set the priority of the set values to be determined and can set the operation reference current value with more flexibility.

It is a schematic block diagram of the circuit breaker of the 1st example. It is a schematic block diagram of the circuit breaker of an Example. It is the figure which showed the internal structure of the general distribution board.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic block diagram showing a first example of the present invention.

Reference numeral 1 denotes a circuit breaker according to the present invention, which is disposed in a distribution board so as to be interposed in the electric circuit 10. Here, the electric circuit 10 assumes a multi-phase electric circuit, 11 is a first voltage phase (referred to as L1 phase), 12 is a second voltage phase (referred to as L2 phase), and 13 is a neutral phase (N phase). Said). Further, the circuit breaker of the present embodiment is a leakage breaker.

101 is a vessel body constituting the circuit breaker 1 is constituted by a case and a cover for housing the contents, to one end of the device body 101 is a power supply terminal 110 provided on the other end load A terminal 120 is provided. The power supply side terminal 110 and the load side terminal 120 are connected to electric wires or conductors constituting an electric circuit.

Between the power source side terminal 110 and the load side terminal 120 includes a contact device 102 comprising a movable contact which is disposed opposite to the fixed contact and the fixed contact, a switching mechanism 103 for opening and closing the contact device 102 , in conjunction with the opening and closing mechanism portion 103, a handle operating member 130 for manually operating the closing mechanism from outside the device body 101, when the abnormal current such as overcurrent or short circuit current in the path occurs the A tripping device 104 acting on the opening / closing mechanism 103 and performing a tripping operation;
A first current transformer (referred to as a first CT) 105 that detects the magnitude of a load current and outputs an output signal provided through the L1 phase 11 and the L2 phase 12 in the electric circuit 10 and a second A current transformer (referred to as second CT) 106;
The L1 phase in paths 10 11, L2 phase 12, N phase 13 zero-phase current transformer and outputs the detected output signal leakage current flowing through the path provided are collectively through inserts (referred ZCT) 107 is Provided.

The tripping device 104 is configured by a thermoelectromagnetic method using a thermodynamic element 1041 configured using bimetal or the like and an electromagnetic tripping element 1042 driven by electromagnetic induction of a current flowing through an electric path. In addition, you may comprise by the complete electromagnetic type which does not use thermodynamic elements, such as a bimetal, as another form.

108, the first current transformer 105 receives the output signal from the second current transformer 106, out determined by arithmetically processing the magnitude of the load current flowing through the path, the operation reference current value set in advance by performing a comparison operation, when the magnitude of the load current than the operation reference current value is large, it performs predetermined time characteristics control, so as to output a trip signal to the trip coil to be described later, the microcomputer It is the operation control part comprised using. In this embodiment, the microcomputer is configured using a storage area for storing the operation reference current value. The storage area may be configured by providing a storage area separately from the microcomputer.

Further, the arithmetic processing based on the output signals from the first CT 105 and the second CT 106 performed by the operation control unit 108 obtains a vector combined sum of the currents of the entire electric circuit detected by the two CTs. It is configured as follows.

As a result, when the electric circuit is interrupted, the electric circuit interrupting operation for protecting the wiring in accordance with the magnitude of the current for each phase is performed by the tripping device 104 configured by the thermal element 1041 and the electromagnetic tripping element 1042. When the current value of the entire electric circuit exceeds a predetermined operation reference current value by acting on the opening / closing mechanism unit 103, a trip operation signal is sent from the operation control unit 108 to the TC 109. As a result, the electric circuit is cut off by the opening / closing mechanism 103.

109 is a trip coil that operates by receiving a predetermined operation signal (called TC), if the TC is activated acts on the switching mechanism 103, the opening and closing mechanism portion performs a tripping operation. The TC 109 operates based on an operation signal output from the operation control unit 108.

In the present embodiment, when detecting leakage by the ZCT107, the leakage current is as leakage tripping control unit for performing an operation tripping actuates the TC109 when a predetermined size The function is given to the operation control unit 108. As another form, the earth leakage trip control unit may be configured to be performed separately by providing a processing circuit separately from the calculation processing of the output signals from the first CT 105 and the second CT 106 described above. Good.

Reference numeral 301 denotes a wireless signal transmission / reception unit for performing wireless communication with a current value setting controller described later. The wireless signal transmission / reception unit 301 includes an antenna that propagates a wireless signal and a wireless signal controller. Further, the wireless signal transmitting and receiving section 301 is connected to the operation control unit 108, data such as operation reference current value information transmitted from the current value setting controller which will be described later, via the wireless signal transmitting and receiving section 301 Input to the operation control unit 108.

Reference numeral 302 denotes a current value setting controller that has a function of inputting an operation reference current value and transmitting it to the circuit breaker 1 or reading an already set operation reference current value.

The current value setting controller 302, the operation reference current value information input unit 3021 having an input key for inputting the operation reference current value, using a liquid crystal panel for displaying an operation reference current value the input an information display unit 3022 that is configured, data including the operation reference current value information, as well as an operation reference current value read start data reading operation reference current value information of setting the circuit breaker wirelessly transmits, also, Information transmission / reception configured using an antenna and a radio transmission / reception circuit for receiving data including operation reference current value information returned from the circuit breaker in response to transmission of the operation reference current value reading start data Part 3023.

Instead of the input key, the information display screen may be configured by using a touch panel for inputting information by pressing the information display screen with an input pen or the like, and inputting the operation reference current value. The information display unit may be configured using another panel such as an EL (Electro-Luminescence) panel instead of the liquid crystal panel.

Next, a case where an operation reference current value is set in the circuit breaker 1 will be described.

For example, the case where the rated current of the circuit breaker 1 is 60 A and the predetermined operation reference current value is set to 50 A will be described.

There are two methods for setting, the first is a method of simply setting the operation reference current value determined by the current value setting controller 302 to the circuit breaker 1, and the second is a predetermined value for the circuit breaker 1 in advance. This is a method of setting a new operation reference current value in the circuit breaker 1 after reading and confirming the existing operation reference current value.

First, the first setting method will be described.

First inputs the operation reference current value information to the operation reference current value information input unit 3021 of the current value setting controller 302 (step S001). The input is performed by inputting “50” using the input key provided in the operation reference current value information input 3021 and confirming with the confirmation key. The input information is displayed on the operation reference current value information display unit 3022.

Then, if correct operating reference current value input, data including the operation reference current value information is wirelessly transmitted from the information transmitting and receiving unit by determining the confirmation key (step S002).

Next, in the circuit breaker 1, data including the operation reference current value information is received by the wireless signal transmitting / receiving unit 301 provided in the circuit breaker 1 (step S101).

Wherein the data including the operation reference current value is received by the radio signal transceiver 301, the operation control unit 108 stores the operation reference current value in a predetermined storage area acquired the operation reference current value information (Step S102).

As a result, the input operation reference current value is set in the circuit breaker 1 in the current value setting controller 302. As described above , the circuit breaker 1 detects the load current value flowing in the electric circuit based on the set operation reference current value, and performs a comparison operation to obtain the determined operation reference current value as the load current value. When the time exceeds, the operation is performed so as to perform predetermined time-limit characteristic control. The predetermined time limit characteristic control will be described later.

Subsequently, the second setting method will be described.

First, in the current value setting controller 302, the information input unit 3021 is operated to confirm that the operation reference current value reading start is performed, and the operation reference current value reading start data is transmitted (step S201).

Next, in the circuit breaker 1, the wireless signal transmission / reception unit 301 provided in the circuit breaker 1 receives the operation reference current value reading start data (step S301).

Next, when the operation reference current value reading start data is received, the operation control unit 108 reads and processes the operation reference current value stored in advance in the storage area, and sets the already set operation reference current value. Is transmitted (step S302).

Next, when the current value setting controller receives the data including the already set operation reference current value (step S202), the calculation processing is performed internally, and the information display unit 3022 displays the already set data. The operation reference current value information is displayed (step S203).

When setting operation of the operation reference current value, with reference to the operation reference current value information the is displayed, it is possible to operate the reference current value of the contract current as expected to verify whether it is set, incorrect You can check if the service is not being used.

Then, enter the operation reference current value information to the operation reference current value information input unit 3021 of the current value setting controller 302 (step S204). The input is performed by inputting “50” using the input key provided in the operation reference current value information input 3021 and confirming with the confirmation key. The input information is displayed on the operation reference current value information display unit 3022.

Then, if correct operating reference current value input, data including the operation reference current value information is wirelessly transmitted from the information transmitting and receiving unit by determining the confirmation key (step S205).

Next, in the circuit breaker 1, data including the operation reference current value information is received by the wireless signal transmitting / receiving unit 301 provided in the circuit breaker 1 (step S303).

Wherein the data including the operation reference current value is received by the radio signal transceiver 301, the operation control unit 108 stores the operation reference current value in a predetermined storage area acquired the operation reference current value information (Step S304).

As a result, the input operation reference current value is set in the circuit breaker 1 in the current value setting controller 302. As described above , the circuit breaker 1 detects the load current value flowing in the electric circuit based on the set operation reference current value, and performs a comparison operation to obtain the determined operation reference current value as the load current value. When the time exceeds, the operation is performed so as to perform predetermined time-limit characteristic control. The predetermined time limit characteristic control will be described later.

The wireless method for transmitting and receiving data such as the operation reference current value may be configured using various wireless methods such as a specific low power wireless and a weak wireless. For the antenna and controller, it may be changed appropriately by performing a suitable circuit design in response to the wireless system.

In the present embodiment, in particular, a suitable setting is made by using radio wave system recognition (referred to as RFID) so that the circuit breaker 1 for setting the operation reference current value can be identified. It is something that can be done.

For example, the radio signal transmitting / receiving unit 301 is configured to include an antenna provided so as to be able to receive a predetermined radio wave and an RFID tag provided so that predetermined data can be rewritten, and the current value setting controller 302 is configured. In the current value setting controller 302, the operation reference current value is input and confirmed by configuring the RFID tag reader / writer function configured to perform wireless communication with the RFID in the information transmitting / receiving unit. by pressing a key, to initiate communication with the ID tag, if the communication is successful, can be information of the set current value to set to be written in the ID tag.

Wherein the data storage area is provided on the RFID tag, the operating reference current value determined by the current setting controller 302 is stored in the data storage area.

The RFID tag is provided connected to the operation control unit 108. The operation control unit 108 reads out the operation reference current value information written in the RFID tag and, as described above, the first tag By receiving output signals from the current transformer 105 and the second current transformer 106, calculating the magnitude of the load current flowing through the electric circuit by arithmetic processing, and performing a comparison operation with a predetermined set current value , wherein when setting than the current value larger magnitude of the load current, performs predetermined time characteristics control, operates to output a trip signal to the trip coil to be described later.

An advantage of performing the operation reference current value by using the RFID method is that the circuit breaker 1 to be set can be individually identified. For example, when the operation reference current value is changed according to the contract current determined individually. When a large amount of data is processed by combining the person information and the operation reference current value information, the possibility of processing the data by mistake can be reduced.

In addition, it is possible to make it difficult to tamper with the operation reference current value, and an effect that unauthorized use can be suppressed in advance can be expected.

Next, the time limit characteristic control will be described.

The time limit characteristic control in the operation control unit 108 is changed according to the load factor (%) with respect to a predetermined set current value as follows.

When the load factor I (%) is 120 <I ≦ 132, a trip signal is output to the TC 109 in about 180 seconds, and when the load factor I (%) is 132 <I ≦ 144, about 10 seconds. The trip signal is output toward the TC 109, and when the load factor I (%) is 144 <I, the trip signal is output toward the TC 109 in about 5 seconds.

Thereby, even when the magnitude | size of the electric current of the whole electric circuit exceeds the said setting electric current value, the circuit breaker 1 can be rapidly cut off. It should be noted that the threshold value of the load factor I (%) may be determined as appropriate regardless of the written value.

The circuit board breaker's time-delaying characteristics (reference to the time-delaying characteristics described in JIS C8370) is 6 minutes when the rated current is 60A and the current is 200% of the rated current (120A). It is stipulated that it operates within 120 minutes at a current of 125% (75 A) of the rated current.

Here, in the time limit characteristic control of the operation control unit 108 described above, when the rated current is 60 A,
When the load factor I (%) is 120 <I ≦ 132, that is, when the load factor I (%) is 132 <I ≦ 144 when the current from 72 A to 79.2 A is about 3 minutes, that is, It operates in about 10 seconds at a current of 79.2A to 86.4A, and operates in about 5 seconds when the load factor I (%) is 144 <I, that is, at a current larger than 86.4A. When the magnitude of the current flowing through the electric circuit exceeds the set current value within the current range in which the wiring can be protected, the time delay release characteristic defined by JIS C8370 is satisfied. In this case, the electric circuit can be cut off earlier.

The value of the set current may be configured to determine a value based on a contract current determined by an electric power company depending on a user's residence area. For example, if the contract current and power company is 50A is, by setting in advance a set current value to 50A, the in the case exceeds the contract current such as using current blocking promptly path Can do.

Here, according to the operational characteristics of “Ministerial Ordinance Attached Table 5 2 Amperage Current Limiter for Establishing Technical Standards for Electrical Appliances” in “Electrical Appliance and Material Safety Law Interpretation Examples”, the rated current is 20A The maximum non-operation current is 22 A (110%), the 30-second non-operation current is 28 A (140%), and the one-second non-operation current is 70 (350%).

When the rated current is 30A, the maximum non-operating current is 33A (110%), the non-operating current for 30 seconds is 39A (130%), and the non-operating current for 1 second is 100 (333%). ).

For a rated current of 40A, the maximum non-operating current is 44A (110%), the non-operating current for 30 seconds is 52A (130%), and the non-operating current for 1 second is 120 (300%). ).

When the rated current is 50 A, the maximum non-operating current is 54 A (108%), the non-operating current for 30 seconds is 64 A (128%), and the non-operating current for 1 second is 150 (300%). ).

In addition, when the rated current is 60 A, the maximum non-operating current is 64 A (107%), the non-operating current for 30 seconds is 76 A (127%), and the non-operating current for 1 second is 180 (300%). ).

In addition, when passing through 30 seconds of inactive current, it does not operate automatically within 30 seconds and within 60 minutes, and when passing through 1 second of inactive current, it is within 1 second. If the rated current is 30 A or less, it will operate within 10 lines, and if the rated current is 40 A or less, it will operate within 20 seconds. When the rated current is 50 A or less, it operates within 20 seconds, and when the rated current is 60 A or less, it operates within 30 seconds.

The time limit characteristic control of the operation control unit 108 is performed within the range of wiring protection and satisfies the operation characteristics of these amperage control current limiters by configuring the time limit characteristic control in consideration of these definitions. Done.

As an embodiment, an example in which a circuit breaker 1 is provided with a first operation reference current setting unit and a second operation reference current setting unit will be described.

Reference numeral 401 denotes an operation reference current value setting unit. The operation reference current value setting unit 401 is configured to variably determine the threshold value of the load current flowing in the electric circuit for operating the trip coil (TC) using a rotary switch. The operation reference current value setting unit 401 is connected to the operation control unit 108, the operation control unit 108 receives an operation reference current value information set in the operation control section setting unit 401, the operation reference current Calculation is performed using the value information as the operation reference current value.

The operation control unit setting unit 401 is configured so that the operation reference current value to be set can be selectively switched and set. There are four types of currents that can be set: 30A, 40A, 50A, and 60A. ing. For example, when the operation reference current value is set to 50A, the rotary switch is rotated and a current value of 50A is selected.

Both the operation reference current value set by the operation reference current value setting unit 401 and the operation reference current value set wirelessly are stored in the operation control unit 108. have set up priorities, such as when the distribution board inspection, or if the work under the witness resident is performed, the current value setting controller 302, for example, when the operator is not ready, the operation reference current If priority is given to the setting value determined by the value setting unit 402, the operation reference current value can be set with more flexibility.

Further, the arithmetic processing based on the output signals from the first CT 105 and the second CT 106 performed by the operation control unit 108 obtains a vector combined sum of the currents of the entire electric circuit detected by the two CTs. It is configured as follows.

As a result, when the electric circuit is interrupted, the electric circuit interrupting operation for protecting the wiring according to the magnitude of the current for each phase is performed by the tripping device 104 configured by the thermal element 1041 and the electromagnetic trip element 1042. When the current value of the entire electric circuit exceeds the predetermined set current value by acting on the opening / closing mechanism unit 103, a trip operation signal is sent from the operation control unit 108 to the TC 109. As a result, the electric circuit is cut off by the opening / closing mechanism 103.

It should be noted that the present invention is not limited to the disclosed embodiments, and can be freely improved and modified as necessary without departing from the spirit of the invention. The configuration may be configured using a completely electromagnetic trip device (a device for detecting an overcurrent using an electromagnetic force generated by a load current flowing in a current coil) without using a thermal element.

The operation reference current value setting unit 401 may be configured using a slide switch or a button-type switch configured to electronically switch the set current value instead of the rotary switch.

In addition, in the wireless communication between the wireless transmission / reception unit 301 and the current value setting controller 302, a communication method may be appropriately determined according to the usage environment such as an infrared communication method. Especially in the case of infrared communication method, since the infrared communication function in a general mobile phone is provided, while reducing the cost of new developing current value setting controller, it is possible to perform excellent current set to seal property it can. In addition, with the mobile phone, in between the data center, such as power companies, to communicate in the dial-up connection or over the Internet, to get the contract current value data that has been negotiated between the user and the power company Or send the operation reference current value information set in the circuit breaker or newly set operation reference current value information so that information processing can be performed in real time so that the work can be performed more efficiently. You may comprise.

In actual use, for the time being, while the main switch and the current limiter are disposed in the distribution board, the circuit breaker 1 is provided in the ZCT 107 and the N phase for the purpose of reducing the cost. The tripping device may be removed and configured as a circuit breaker dedicated to current limiting, and may be configured to be shared with the main switch.

The setting method of the operation reference current value in the present invention can be applied to a circuit breaker used in place of a current limiter and a main circuit breaker installed in a general single-phase three-wire residential distribution board. .

DESCRIPTION OF SYMBOLS 1 Circuit breaker 10 Electric circuit 11 1st phase 12 2nd phase 13 3rd phase 101 Body 130 Handle operation member 102 Contact apparatus 103 Opening-and-closing mechanism part 104 Tripping device 1041 Thermal element 1042 Electromagnetic tripping element 105 1st One current transformer 106 Second current transformer 107 Zero phase current transformer 108 Operation control unit 109 Trip coil 110 Power supply side terminal 120 Load side terminal 130 Handle operation member 301 Radio signal transmission / reception unit 302 Current value setting controller 3021 Operation standard Current value information input unit 3022 Information display unit 3023 Information transmission / reception unit 401 Operation reference current value setting unit

Claims (1)

First and second current transformers (CT) that are respectively provided so as to penetrate the first phase and the second phase in the multi-phase electric circuit and detect the magnitude of the load current;
A switching mechanism for turning on and off the said electrical path and interposed between the electric path,
An operating handle for manually operating the said switching mechanism operable as the interlocked the instrument outside the body to the opening and closing mechanism unit,
A tripping means comprising a thermal element and an electromagnetic tripping element that act on the opening / closing mechanism and performs a tripping operation when a predetermined current flows through the electric circuit;
A trip coil (TC) that operates on the opening / closing mechanism and receives a predetermined operation signal;
The load current value flowing in the electric circuit is detected by the first and second current transformers (CT), and
The calculation means connected to the current transformer (CT) receives the output signals from the first and second current transformers (CT), calculates the vector synthesis sum of the output signals, and finds the first When the combined load current value of the entire electric circuit in the phase and the second phase is compared with the operation reference current value stored in the storage unit in advance, and the load current value is larger than the operation reference current value Performs a predetermined time-limit characteristic control, outputs an operation signal to the trip coil (TC), operates the trip coil (TC) with an operation control unit including the storage unit for detaching the opening / closing mechanism unit As a current setting unit that variably sets a threshold value of the operation reference current value for performing a comparison operation with the combined load current value of the entire electric circuit for
Connected to the operation control unit,
And operating the reference current value information input unit for inputting the operation reference current value, operating the reference current value read start data reading data as well as operation reference current value information of setting end in the circuit breaker including the said operating reference current value information An information transmission unit that wirelessly transmits a current and an information reception unit that receives data including operation reference current value information returned from the circuit breaker in response to transmission of the operation reference current value reading start data Wireless communication with the value setting controller
A first operation reference current value setting unit including a wireless signal transmission / reception unit for wirelessly transmitting and receiving operation reference current value data;
Connected to the operation control unit,
A circuit breaker comprising a second operation reference current value setting unit that selectively sets an operation reference current value;
While storing the operation reference current value determined by the first operation reference current value setting unit and the second operation reference current value setting unit in the storage unit of the operation control unit,
A circuit breaker characterized in that a priority is provided to these determined operation reference current values.

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