JP2008288101A - Molded-case circuit-breaker with built-in ct - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molded-case circuit-breaker with a built-in CT, capable of measuring and outputting a current for a branch circuit even when the inside space of a distribution board has no sufficient room. <P>SOLUTION: This molded-case circuit-breaker is a type in which a body case 1 is longitudinally divided in its width direction, and components are assembled from its lateral direction. A CT 12 for measuring the current is disposed in the inside of the body case 1 so that the direction of its through hole 13 becomes perpendicular to the longitudinal direction of the body case 1. The CT 12 is disposed by displacing it from the center plane in the width direction of the body case 1, and an electric path on the side to which the CT 12 and the side plate of the body case 1 are close is preferably passed through the through hole 13 of the CT 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a CT built-in wiring circuit breaker in which CT is accommodated in a vertically divided main body case.

  The distribution board has a large number of branch breakers connected to the secondary side of the main breaker. When a current exceeding the rating flows through the main breaker or the branch breaker, the circuit breaks to protect the load. However, if a load is connected that causes serious damage when the power is suddenly turned off, such as a server, a current alarm is issued before the current exceeds the rating, and the circuit may be interrupted if it is left as it is. It is desirable to have a function for warning in advance.

  Therefore, as shown in Patent Document 1, a distribution board is proposed in which a CT is built in the main breaker and the CT output is input to the monitoring device to warn that the main circuit current is close to the rating. Has been. Since the main breaker is larger than the branch circuit breaker and has a sufficient internal space, it is possible to incorporate a CT.

However, the distribution board of Patent Document 1 can provide a current alarm for the main circuit, but does not have a current alarm function for the branch circuit. For this reason, when it is desired that the branch circuit also has a current alarm function, as shown in Patent Document 2, it is necessary to connect an additional function unit having a built-in CT to the load-side terminal of the branch breaker. However, if the configuration of Patent Document 2 is adopted, a large amount of extra space is required for the additional function unit and the output wiring from the additional function unit, leading to an increase in the size of the distribution board.
JP 2001-218313 A JP 2001-126607 A

  The present invention solves the above-mentioned conventional problems, and provides a CT built-in circuit breaker that enables CT output for current measurement in a branch circuit even when there is not enough room in the internal space of the distribution board. It is intended to provide.

  A circuit breaker for CT built-in wiring according to the present invention made to solve the above problems is a circuit breaker of a type in which a main body case is vertically divided in the width direction and parts are assembled from the horizontal direction. The CT is arranged inside, and the direction of the through hole is arranged perpendicular to the longitudinal direction of the main body case.

  Note that, as in claim 2, the circuit breaker is a two-pole type having a two-pole electric circuit inside the main body case, and the CT is arranged so as to be biased from the center plane in the width direction of the main body case. In this case, it is preferable that the electrical path on the side where the CT and the side plate of the main body case are close is passed through the through hole of the CT.

  Since the CT built-in circuit breaker according to the present invention is arranged with the direction of the CT through-hole being perpendicular to the longitudinal direction of the main body case, it is not necessary to make the diameter of the CT smaller than the width of the main body case. For this reason, there is no restriction on the size of CT, and the degree of freedom of selection increases. In addition, since the electric circuit inside the circuit breaker for wiring is formed in the longitudinal direction, the CT that needs to penetrate this electric circuit also has the direction of the through-hole in the longitudinal direction of the main body case as seen in Patent Document 2. It is a common-sense arrangement to set the direction. However, adopting such an arrangement is not preferable because it restricts the size of the CT and reduces the thickness of the case. Thus, the CT built-in circuit breaker of the present invention has a built-in CT for current measurement, so that even if there is not enough room in the internal space of the distribution board, CT output is possible even for the branch circuit. Become.

  Further, if the CT is arranged so as to be deviated from the center plane in the width direction of the main body case as in claim 2, the electric circuit can be easily incorporated, and the CT and the side plate of the main body case can be used as in claim 3. If the electric circuit on the side closer to is penetrated through the through hole of the CT, the insulation between the CT and the different polarity can be improved.

Preferred embodiments of the present invention are shown below.
1 is a perspective view showing the internal structure of a CT built-in circuit breaker according to the present invention, FIG. 2 is a top view, FIG. 3 is a front view, FIG. 4 is a rear view, and FIG. It is a front view of the distribution board which incorporated. In addition, the circuit breaker for wiring of this embodiment is a two-pole type.

  As shown in FIGS. 1 and 2, the circuit breaker of the present invention is a central case 2, a right case 3, and a left case 4, in which a body type case 1 having a lateral width of 25 mm is vertically divided in the width direction. Is. When assembling the internal device, the central case 2 is supported horizontally, the right side portion is assembled from above, and the right case 3 is closed. After that, the front and back are turned over, the left part is assembled in the central case 2, and the left case 4 is closed. That is, it is a type of circuit breaker for assembling parts from the lateral direction with respect to the vertically divided main body case 1.

  In this way, the power supply side terminal 5 is incorporated at one end in the longitudinal direction of the main body case 1 and the load side terminal 6 is incorporated at the other end. A mechanism portion 8 having a handle 7 is incorporated in the central portion of the main body case 1. The mechanism unit 8 includes a movable contact 9 and turns the circuit on and off with the fixed contact 10. A tripping part 11 having a bimetal is provided on the load side of the mechanism part 8, and when the current flowing through the circuit exceeds the rating, the mechanism part 8 is operated to interrupt the circuit.

  Although these structures are the same as those of the prior art, in the present invention, a CT 12 for current measurement is arranged inside the main body case 1. Moreover, the CT 12 is arranged such that the direction of the through hole 13 is perpendicular to the longitudinal direction of the main body case 1, that is, in the width direction. With such an arrangement, it is not necessary to make the diameter dimension of the CT 12 smaller than the width dimension of the main body case 1, the size of the CT 12 is not restricted, and the degree of freedom of selection increases.

  In this embodiment, the position of the CT 12 is between the power supply side terminal 5 and the fixed contact 10. And the wire | line 14 is penetrated by the coating | cover which connects the power supply side terminal 5 and the stationary contact 10. FIG. In the case of ZCT for leakage detection, it is necessary to penetrate all the lead wires into the inside thereof. However, in the case of CT12 for current measurement of the present invention, it is sufficient to penetrate only one pole. As shown, the stranded wire 15 of the other pole passes through the side of the CT 12.

  As shown in FIG. 2, the CT 12 is arranged so as to be biased to one side from the center surface in the width direction of the main body case 1. And the covered strand 14 which is the electric circuit of the side where CT12 and the side plate of the main body case 1 are close is made to penetrate the through hole 13 of the CT12. Such an arrangement is effective in ensuring insulation between the other wires such as the stranded wire 15.

  In this embodiment, the central case 2 has a shape in which the corresponding position of the CT 12 is biased. However, the central case 2 is cut out only in a portion where the CT 12 is accommodated, and is sandwiched between the right case 3 and the left case 4. It is also possible to configure the main body case 1 from the right case 3 and the left case 4 without using the central case 2 at all.

  The output of the CT 12 is guided to the connector 20 near the load side terminal 6.

  The CT built-in circuit breaker of the present invention configured as described above is used as a branch breaker of a distribution board as shown in FIG. In FIG. 5, 30 is a main breaker, and 31 is a main CT provided on the power supply line 32. The output of the CT 31 is input to the monitoring device 34 through the signal line 33, and a current alarm is issued when the current of the main circuit exceeds 90% of the rating.

  Moreover, the circuit breaker 36 with a current alarm having a built-in CT and a current alarm output board is provided with an LED for current alarm display at the top of the main body case, and the current detected by the CT is 80% of the rating. When the current exceeds the value, a current alarm is output to the connector, and at the same time, the LED is turned on.

  As shown in FIG. 5, the connectors 20 are sequentially connected in series by a crossover wiring 35, and the end portions are input to the monitoring device 34. Such a crossover wiring 35 is simpler and requires less space than connecting the connectors of the current alarm wiring breaker 36 to the monitoring device 34 individually. However, the monitoring device 34 cannot determine which branch circuit has output the current alarm. However, if the monitoring device 34 issues a current alarm, the current alarm of the breaker that has output the current alarm can be determined by looking at the distribution board. Since the display LED is lit, it can be easily discriminated.

  In the CT built-in circuit breaker of the present invention, the signal line 37 is directly connected to the monitoring device 34 by the connector 20. The above-described circuit breaker 36 with current alarm is collectively monitored by the crossover wiring 35, but the CT built-in circuit breaker of the present invention is provided with a plurality of circuits instead of one circuit as in this embodiment. In some cases, each can be directly connected to the monitoring device and monitored.

  As described above, the CT built-in circuit breaker according to the present invention does not require the diameter of the CT to be smaller than the width of the main body case, and the degree of freedom of CT selection is increased. Further, since the current measurement CT is built in the main body case, there is an advantage that a current alarm can be output even for the branch circuit even when the internal space of the distribution board does not have a sufficient margin.

It is a perspective view which shows the internal structure of the circuit breaker for CT built-in wiring of this invention. It is a top view of the circuit breaker for CT built-in wiring of this invention. It is a front view of the circuit breaker for CT built-in wiring of the present invention. It is a rear view of the circuit breaker for CT built-in wiring of this invention. It is a front view of the distribution board incorporating the circuit breaker for CT built-in wiring of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body case 2 Center case 3 Right side case 4 Left side case 5 Power supply side terminal 6 Load side terminal 7 Handle 8 Mechanism part 9 Movable contact 10 Fixed contact 11 Tripping part 12 CT
13 CT through hole 14 Covered strand 15 Covered strand 20 of other pole 20 Connector 30 Master breaker 31 CT for master
32 Power supply line 33 Signal line 34 Monitoring device 35 Crossover wiring 36 Circuit breaker 37 for wiring with current alarm Signal line

Claims (3)

  A circuit breaker of the type that divides the main body case vertically in the width direction and assembles parts from the horizontal direction, with CT inside the main body case and the direction of the through hole perpendicular to the longitudinal direction of the main body case A circuit breaker for wiring with built-in CT, characterized by being arranged.   2. The circuit breaker according to claim 1, wherein the circuit breaker for wiring is a two-pole type having an electric circuit for two poles inside the main body case, and the CT is arranged so as to be deviated from the center plane in the width direction of the main body case. The circuit breaker for CT built-in according to 1.   3. The CT built-in circuit breaker according to claim 2, wherein an electric circuit on the side close to the side plate of the main body case is passed through the CT through hole.

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