JP4494836B2 - 2-pole circuit breaker - Google Patents

Description

In the present invention, the width of the side-by-side circuit breaker is reduced by about half compared to the conventional two-pole circuit breaker, which is constructed by arranging the outer shell of the container to face the cover divided in the longitudinal direction. More particularly, the present invention relates to a thin two-pole circuit breaker provided with a function of detecting an energization current.

2. Description of the Related Art Conventionally, a bipolar circuit breaker that has been widely used as a branch breaker for a distribution board as a safety breaker has been described in Patent Document 1 as having a current transformer for detecting current. FIG. 7 shows a schematic block diagram of a circuit breaker that has been used as a safety breaker equipped with this current transformer.

The basic circuit breaker structure includes power-side terminals 71a and 71b and load-side terminals 72a and 72b, and these terminals are electrically opened and closed by a breaker 73. Further, an overcurrent detection element 74 configured by an electromagnetic trip device having a thermal element represented by bimetal or an oil dashpot is provided between the power supply side terminal 71b and the load side terminal 72b. When the detection element 74 detects that an overcurrent, a short-circuit current, or the like flows in the branch circuit, and the energized current enters the operable region of the branch breaker 7, the blocking unit 73 performs a blocking operation in conjunction with both poles. there were.

As for the current transformer for detecting current, a branch current transformer 75 for detecting current flowing through the branch circuit is provided between the power supply side terminal 71b and the load side terminal 72b. It was configured to be drawn out of the breaker through the external outlet 76 and led to a lead wire 77 and a harness 78 provided at the tip thereof. In Patent Document 1, since all the branch breakers have built-in current transformers, the detection signal of the branch current transformer 75 led to the harness 78 in the signal detection is further a common line (common line). ) And is input to the first measurement unit printed board 8a via the connectors 82 and 83.

Japanese Patent Laid-Open No. 2001-103621 (Nos. 0021, 0022, and 6)

However, the branch breaker described in Patent Document 1 is a safety breaker type two-pole circuit breaker that has been widely used in the past, and the side-by-side direction of the breaker compared to the conventional two-pole circuit breaker developed in recent years. Even in a two-pole circuit breaker whose width is reduced to about half, a circuit breaker having a current transformer for detecting an energization current has been desired.
Usually, a plurality of branch breakers are provided on the distribution board. As described in Patent Document 1, all branch breakers are provided with branch current transformers for detecting the current flowing through the branch circuit. In some cases, the lead wires run through the distribution board, occupying a lot of wiring space, and wiring work becomes difficult.
In addition, since the lead wire is drawn out from the side surface of the circuit breaker, there is a problem that an excessive force is applied to the lead wire when the circuit breaker is installed, and there is a risk of disconnection due to the biting of the wire. .
In addition, since the lead wire is physically drawn out from the circuit breaker, the circuit breaker body in the event of an overcurrent or short circuit between the lead wire and the receiving device that receives the signal via the lead wire. There is a problem that there is a risk that a signal may not be accurately received due to a factor caused by heat generation or misdetection due to insulation breakdown of the signal line due to biting of the lead wire.

Therefore, in order to solve the above-described problems, the present invention
To provide a two-pole circuit breaker that is equipped with a current transformer for detecting an energization current of a branch circuit in a thin branch switch developed in recent years and that can take out a signal corresponding to the energization current to the outside. It is aimed.
Further, when taking out a signal corresponding to the energization current to the outside, an output unit for taking out the signal corresponding to the energization current to the outside and being output from the output unit, which hardly affects the wiring workability in the distribution board. An object of the present invention is to provide a two-pole circuit breaker that can reliably ensure insulation from a signal receiving device that receives a signal.

In order to solve the above problems, in the invention of claim 1,
A contact device comprising a movable contact provided with a movable contact and a fixed contact provided with a fixed contact opposite to the movable contact is provided in an energizing path from the power supply terminal to the load terminal. And an opening / closing mechanism that opens and closes the movable contact in the event of an overcurrent, and a cover divided in the longitudinal direction is provided so as to face each other. In a two-pole circuit breaker that configures the outer shell, the energizing current is detected so that a part of the conducting path extending from the load terminal of one of the poles to the contact device is inserted inside the two-pole circuit breaker. a current transformer for the vicinity of the current transformer at the load terminal side of the said 2-pole circuit breaker, and a connecting portion for the signal lead lines of the displacement current transformer is connected, depending on the energizing current for amplifying an output signal output from the current transformer An amplifier unit, an A / D conversion unit for A / D converting the output signal, an AC / DC converter unit for supplying power to drive the amplifier unit and the A / D conversion unit, An output means including a wireless IC tag having an individual ID number for transmitting an output signal to the outside of the circuit breaker, and a wireless IC tag reader or a wireless IC tag reader / When the radio IC tag receives a radio wave from a receiving device including a writer and responds, an output signal corresponding to the energized current and the individual ID number are output from the radio IC tag. A two-pole circuit breaker is provided.

In the first problem solving means,
A contact device comprising a movable contact provided with a movable contact and a fixed contact provided with a fixed contact opposite to the movable contact is provided in an energizing path from the power supply terminal to the load terminal. And an opening / closing mechanism that opens and closes the movable contact in the event of an overcurrent, and a cover divided in the longitudinal direction is provided so as to face each other. In a two-pole circuit breaker that configures the outer shell, the energizing current is detected so that a part of the conducting path extending from the load terminal of one of the poles to the contact device is inserted inside the two-pole circuit breaker. a current transformer for the vicinity of the current transformer at the load terminal side of the said 2-pole circuit breaker, and a connecting portion for the signal lead lines of the displacement current transformer is connected, depending on the energizing current for amplifying an output signal output from the current transformer An amplifier unit, an A / D conversion unit for A / D converting the output signal, an AC / DC converter unit for supplying power to drive the amplifier unit and the A / D conversion unit, An output means including a wireless IC tag having an individual ID number for transmitting an output signal to the outside of the circuit breaker, and a wireless IC tag reader or a wireless IC tag reader / When the radio IC tag receives a radio wave from a receiving device including a writer and responds, an output signal corresponding to the energized current and the individual ID number are output from the radio IC tag. As a 2-pole circuit breaker has been provided,
Even in a 2-pole circuit breaker that has been developed in recent years, the width of the circuit breaker is reduced to about half that of a conventional 2-pole circuit breaker, there is a current transformer that detects the energization current of the branch circuit. An output unit which can take out a signal according to the energizing current to the outside, and which hardly affects the wiring workability in the distribution board, and which takes out the signal according to the energizing current, and the output unit There is an effect that it is possible to provide a two-pole circuit breaker that can reliably ensure insulation with a signal receiving device that receives a signal output from the terminal.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is an internal block diagram of a two-pole circuit breaker showing a first example of the present invention.

The two-pole circuit breaker 1 is provided so that the cover a100a and the cover b100b divided in the longitudinal direction face each other when the direction connecting the power supply side and the load side is the longitudinal direction. Is configured. Each component constituting the circuit breaker 1 is accommodated so as to be inserted into the divided cover a100a and cover b100b.

Reference numerals 101a and 101b denote power supply side terminals to which current is supplied from a bus or a branch line that supplies current to each branch switch provided in the distribution board.

Reference numerals 102a and 102b denote load-side terminals that are connected to the load-side electric circuit and supply current to the load device.

Reference numeral 103 denotes a contact device that includes a movable contact 1032 having a movable contact and a fixed contact 1031 having a fixed contact that is opposed to the movable contact and opens and closes an electric circuit.

Reference numeral 104 denotes an opening / closing mechanism that opens and closes the contact device 103. The opening / closing mechanism 104 includes a link member that opens and closes the contact device by an operation handle that is disposed on the body of the circuit breaker.

105 is a tripping means that acts on the switching mechanism 104 to open the movable contact when an overcurrent occurs, and is constituted by a bimetal that is an overcurrent element or an electromagnetic trip device.

Reference numeral 106 denotes a current transformer that detects an energization current in the electric circuit, and generates an output signal corresponding to the energization current. The output signal is output from a lead line provided in the current transformer 106.

Reference numeral 107 denotes output means for taking out the output signal of the current transformer 106 to the outside of the circuit breaker, and a signal take-out section is provided in a cover that constitutes the breaker body.

Reference numeral 108 denotes an insulating wall for insulating the poles from each other. The insulating wall is arranged to be inserted into the cover and is exposed as part of the body of the circuit breaker.

The circuit breaker shown in this example is a two-pole one-element circuit breaker, where the power supply terminal 101b side is the power supply pole side and the power supply terminal 101a is the neutral pole side. The power supply terminals 101a and 101b are each connected to the contact device 103 via a conductor, and are connected to the load terminals 102a and 102b via the tripping means 105 on the power supply electrode side from the contact device.

The current transformer 106 is disposed so as to be inserted through a part of the conductive path on the neutral electrode side. An output signal generated by the current transformer 106 according to the energization current is guided to a signal output means 107 provided in the container body by a lead wire provided in the current transformer. The output means 107 is provided on the load terminal side of the container facing the handle operating portion that opens and closes the movable contact that constitutes the contact device 103, and here, the hole is provided in the container so that a lead wire can be drawn out. It is composed. A connector terminal for relaying the lead wire is attached to the leading end of the lead wire outside the body.

When attention is paid to the configuration of the contact device 103, in this embodiment, the contact devices are arranged in the order of the fixed contact 1031 and the movable contact 1032 as seen from the power supply terminals 101a and 101b, as shown in FIG. In addition, the present invention can be applied even if the contact device is a circuit breaker configured in the order of the movable contact 1032 and the fixed contact 1031 when viewed from the power supply terminals 101a and 101b side in view of the configuration of the contact device. is there. Further, as shown in FIG. 3, a tripping means 105 is provided between the power supply terminal 101b and the contact device 103 so that the arrangement of the contact device 103 is movable from the power supply terminal 101b side on the power supply electrode side. Even if the circuit breaker is arranged in the order of the child 1032 and the fixed contact 1031 and arranged on the neutral pole side in the order of the fixed contact 1031 and the movable contact 1032 from the power supply terminal 101a side, The invention is applicable. In addition, the present invention can be applied to the order of various arrangements of the contact device of the circuit breaker and the tripping means at each pole without departing from the normal.

Further, as the output means 107, a hole is provided in the body of the circuit breaker 1 so as to pull out the lead wire, but a connector is provided as an output means in the body, and the connector is used to relay signals to the outside. You may comprise so that it may be performed.

Next, it will be described with reference to FIG. 4 for details of the circuit breaker. Figure 4 shows a structure diagram of the circuit breaker. In addition, the same code | symbol was attached | subjected to the component with the same meaning as the above-mentioned component.

The outline of the circuit breaker, that is, the container body, is composed of a cover 100a and a cover 100b divided in the longitudinal direction and an insulating wall 108 when the direction connecting the power supply side and the load side is the longitudinal direction. Each component constituting the circuit breaker is housed so as to be inserted into the divided cover a100a and cover b100b. 109 is a handle operating unit, 103 is a contact device, 110 is a movable contact holding member, 104 is an opening / closing mechanism unit, 105 is a tripping means, 106 is a current transformer, 102a is a load terminal a, 102b is a load terminal b, and 101a is The power supply terminals a and 101b indicate the power supply terminal b. Further, the description will be made assuming that the A side is the power supply side and the B side is the load side.

FIG. 5 shows an enlarged and substantially exploded view in order to explain the periphery of the current transformer 106 in detail.

A movable contact 1032a on the neutral electrode side and a movable contact 1032b on the power supply electrode side are mounted and held on the movable contact holding member 110, and a movable contact is mounted on each end. In addition, fixed contacts 1031a and 1031b provided with fixed contacts at the ends so as to make a pair and face these movable contacts are arranged to constitute a contact device 103.
The movable contact holding member 110 rotates about a substantially central axis portion of the movable contact holding member 110 supported by the cover a100a and the cover b100b. The movable contacts 1032a and 1032b extend alternately from the center of rotation of the movable contact holding member 110.

The contact device 103 is connected to a handle operation unit 109 via an opening / closing mechanism unit 104 composed of a link member, and the contact device can be manually opened and closed by operating the handle operation unit 109.

When an overcurrent is generated, a tripping means 105 configured to include a bimetal as an overcurrent tripping element acts on the switching mechanism unit 104, breaks the equilibrium state of the link unit, operates the switching mechanism unit, and a contact device 103 movable contacts 1032a and 1032b are opened. In addition, an electromagnetic element may be used as the overcurrent tripping element.

The movable contact 1032a is connected to the load terminal 102a by the through conductor 111a. The movable contact 1032b is connected to the power supply terminal 101b by a conductor 111b. The fixed contact 1031b is provided by extending a part of the load terminal 102b, and the fixed contact 1031a is connected to the power supply terminal 101b by a conductor 111b.

The current transformer 106 is disposed so as to pass through a through conductor 111a interposed between the movable contact 1032a and the load terminal 102a. As a result, the energization current flowing through the neutral pole side, that is, the energization current flowing through the two-pole circuit switch can be detected. An output corresponding to the detected current, that is, an energization current, can be taken out from the current transformer 106 by a lead wire 1061 provided in the current transformer 106.

An output means 107 for extracting the output from the current transformer 106 outside the circuit breaker faces the handle operation section 109 on the load terminal side, and a handle operation section that is desired when the circuit breaker is disposed on the distribution board. A hole is provided in a portion that is one step down from the surface on which is provided. A lead wire 1061 is pulled out from the hole, and the output signal of the current transformer 106 is guided to the outside of the circuit breaker. For this reason, even when a circuit breaker is provided in the distribution board, it is possible to easily draw the lead wire outside without hindering the work. In addition, since the lead-out is easy, an excessive force is not applied to the lead-out line and there is no possibility of disconnection.

Since the two-pole circuit breaker is configured in this way, it is equipped with a current transformer that detects the energization current of the branch circuit, and a signal corresponding to the energization current can be taken out to the outside. It is possible to provide a two-pole circuit breaker that can easily take out signals even when installed in the electrical panel and that does not affect the wiring workability, and that can improve the insulation from the power source. is there.

Next, an example in which the output means according to the first embodiment is configured including a wireless IC tag will be shown. FIG. 6 shows a block diagram of a circuit breaker according to the second embodiment.

As in FIG. 4, the outline of the circuit breaker, that is, the container body, is formed from the cover 100 a and the cover 100 b and the insulating wall 108 divided in the longitudinal direction when the direction connecting the power source side and the load side is the longitudinal direction. It is configured. Each component constituting the circuit breaker is housed so as to be inserted into the divided cover a100a and cover b100b. 109 is a handle operating unit, 103 is a contact device, 110 is a movable contact holding member, 104 is an opening / closing mechanism unit, 105 is a tripping means, 106 is a current transformer, 102a is a load terminal a, 102b is a load terminal b, and 101a is The power supply terminals a and 101b indicate the power supply terminal b. Reference numeral 600 denotes output means for taking out the output signal of the current transformer 106 to the outside of the circuit breaker. The output means 600 is provided in the body of the circuit breaker and has a wireless IC tag (Radio Frequency tag).
Identification Tug) (hereinafter referred to as RFID tag). Further, the description will be made assuming that the A side is the power supply side and the B side is the load side.

In the previous example , the lead wire from the CT is pulled out to the outside of the circuit breaker, and the output signal of the current transformer that is output according to the energizing current is received by the receiving device provided outside. On the other hand, in the present embodiment, the lead wire provided in the current transformer is connected to the output means, and output from the receiver provided with the RFID reader or the RFID reader / writer provided outside the circuit breaker when necessary. By irradiating the RFID tag provided in the means with radio waves in the 2.45 GHz band, a response signal responding from the RFID tag is received, and an output signal corresponding to the energized current is obtained from the received signal.

The RFID tag provided in the output means 600 has an individual ID number, and the signal data is transmitted including the ID number, and the transmission source can be specified. For this reason, it is possible to reliably grasp which branch circuit breaker has sent the signal from the plurality of branch circuit breakers in the distribution board. On the receiving device side, the output signal of each branch circuit is processed and processed into the desired data, so that the data can be statistically handled for each branch circuit, time-series data accumulation, and the output value at that time Data can be handled such as extracting.

The output means 600 includes a connection portion for connecting a lead wire from the current transformer, an amplifier portion for amplifying the output signal generated from the current transformer, and an A portion for A / D converting the output signal. An / D conversion unit and an AC / DC converter unit for supplying power for driving the amplifier unit and the A / D conversion unit are provided.

The communication distance of the radio wave output from the output means is currently about several tens of centimeters for the 13.56 MHz band generally used for RFID tags and about 1 m for the 2.45 GHz band based on regulations of the Radio Law. The frequency to be used may be changed according to the number of branch circuits of the distribution board. At present, it is expected that a frequency of around 950 MHz (UHF band), which allows a communication distance of several meters due to deregulation, can be used.

In the embodiment, the signal amplifying unit such as the amplifier unit and the A / D conversion unit and the conversion unit are provided separately from the RFID tag, but the signal amplifying unit such as the amplifier unit and the A / D conversion unit will be provided in the RFID tag in the future. When the conversion unit is mounted, the configuration of the output unit 600 can be further simplified, and the output unit may be configured by the power supply unit and the RFID tag.

Therefore, according to the specification of the RFID tag, an amplifier unit for amplifying the output signal generated from the current transformer, an A / D conversion unit for A / D converting the output signal, these amplifier units, A The output unit may be configured with an AC / DC converter unit for driving the / D conversion unit as necessary.

As described above, since the output unit 600 includes the RFID tag, the wiring work is not required as compared with the case where the lead wire is used in the first embodiment, and the signal generated from the current transformer is more easily connected to the outside. It can be taken out. In addition, since a lead wire to the outside of the circuit breaker is not used, reliable insulation can be maintained with the receiving device.

Next, a modified embodiment of the first embodiment will be shown. In the first embodiment, a response signal is obtained by radiating radio waves from a receiving apparatus equipped with an RFID reader or an RFID reader / writer when necessary, and the response signal is obtained continuously. A response signal may be obtained.

As described above, since the two-pole circuit breaker is configured, it is equipped with a current transformer that detects the energization current of the branch circuit, and it is possible to take out a signal corresponding to the energization current to the outside, and in the distribution board Bipolar circuit that can reliably ensure the insulation between the output unit for taking out a signal corresponding to the energization current and the signal receiving device for receiving the signal output from the output unit, which does not easily affect the wiring workability Breaker can be provided.

In the case where the output means 600 in the present embodiment is a two-pole circuit breaker equipped with an RFID tag and a distribution board is configured as a branch switch, current information and insulation are provided for each branch switch. It can be taken out to an external device while being kept. Prevents unnecessary signals from being input to external devices due to failure of output means, surge current, etc., enables accurate information data collection, and eliminates the need for lead wires from each branch switch to external devices. This eliminates the need for wiring space due to the wiring in the distribution board and facilitates the wiring work to the load circuit connected to the branch switch.

In a two-pole circuit breaker, a current transformer for detecting the energization current is provided in the body, and the output signal from the current transformer can be taken out of the circuit breaker. It can be applied to monitoring current and monitoring current flow for each branch switch.

The block block diagram of the circuit breaker which showed the 1st example of this invention. The block block diagram of the circuit breaker which showed the 1st example of this invention. The block block diagram of the circuit breaker which showed the 1st example of this invention. The internal structure figure of the circuit breaker which showed the 1st example of this invention. The internal enlarged view of the circuit breaker which showed the 1st example of this invention. The internal structure figure of the circuit breaker which showed the 1st Example of this invention. The figure which showed patent document 1 of the prior art example.

Explanation of symbols

1 2-pole circuit breaker 100a Cover a
100b Cover b
101a Power supply terminal a
101b Power supply terminal b
102a Load terminal a
102b Load terminal b
103 Contact device 1031a Fixed contact a
1031b Fixed contact b
1032a Movable contact a
1032b Movable contact b
104 Opening / closing mechanism 105 Tripping means 106 Current transformer 107 Output means 108 Insulating wall 109 Handle operating part 110 Movable contact holding part 111a Through conductor a
111b Conductor b
600 Output means

Claims (1)

In the current path from the power supply terminal to the load terminal,
A contact device comprising a movable contact provided with a movable contact and a fixed contact provided with a fixed contact opposite to the movable contact;
An opening and closing mechanism for opening and closing the contact device;
A tripping means that acts on the switching mechanism to open the movable contact when an overcurrent occurs,
In a two-pole circuit breaker in which a cover divided in the longitudinal direction is provided so as to face each other and the outer shell of the container is configured,
Inside the two-pole circuit breaker,
A current transformer for a part of the current path leading to the contact unit for detecting the electric current to pass through insert from the load terminal of one of the poles,
Near the current transformer near the load terminal of the two-pole circuit breaker,
A connection part to which the signal lead-out line of the current transformer is connected, an amplifier part for amplifying an output signal output from the current transformer in accordance with the energization current, and A / D conversion of the output signal A / D conversion unit for power supply, an amplifier unit, an AC / DC converter unit for supplying power for driving the A / D conversion unit, and an individual ID for transmitting the output signal to the outside of the circuit breaker An output means including a wireless IC tag having a number;
Upon receiving radio waves from a receiver equipped with a wireless IC tag reader or wireless IC tag reader / writer provided outside the two-pole circuit breaker,
A bipolar circuit breaker characterized in that an output signal corresponding to the energized current and the individual ID number are output from the wireless IC tag when the wireless IC tag responds .