JPH0237652B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides four
This invention relates to a four-pole type circuit breaker that opens and closes phases.

[Technical background of the invention]

1 and 2 are a longitudinal sectional view and a plan view of a four-pole type circuit breaker, in which 1 is a cover made of an insulating material, and 2 is a case made of an insulating material. Further, reference numeral 3 in the figure is a power supply side fixed terminal provided for each of the R phase, S phase, T phase, and N phase, and this fixed terminal 3 has a fixed side contact 4 at one end. Reference numeral 5 in the figure indicates a movable arm provided for each phase, and this movable arm 5 has a movable contact 6 at one end.
The other end is rotatably connected to the arm holder 7 via a pin 5a. The arm holder 7 is attached to a cross bar 8 common to the four phases, and the cross bar 8 is rotatably supported by the case 2. A spring 9 is interposed between the arm holder 7 and the movable arm 5 to obtain contact pressure between the contacts 4 and 6. Further, a lower link 10 is rotatably connected to the pin 5a, and an upper link 1 is connected to the rotary end of the lower link 10.
1 are rotatably connected via a pin 12.

On the other hand, a frame 13 is fixed to the case 2, and one end of a catch 14 is pivotally connected to the frame 13 via a pin 14a.
The other end of the upper link 11 is connected to the center of the catch 14 via a pin 15, and the other end of the catch 14 is engaged with a catch receiver 16. Reference numeral 17 in the figure is a stopper pin that protrudes from the center of the upper link 11, and when it comes into contact with a part of the catch 14, the upper link 11 moves to the pin 15.
This is to prevent rotation in the counterclockwise direction using the fulcrum as the fulcrum.

Reference numeral 18 in the figure is a handle, and the handle 18 is attached to a handle support 19 rotatably pivoted to the frame 13. The handle 18 is rotated to close or open the circuit or disconnector. Further, between the handle support 19 and the pin 12, a tension coil spring 21, which together with the links 10 and 11 constitutes a toggle mechanism, is stretched. The catch receiver 16 has one end engaged with the catch 14 and the other end engaged with the trip rod 22. Note that 22a in the figure is a rotation axis of the trip rod 22.
The movable arm 5 is connected to a heater 24 via a flexible conductor 23. In addition, the heater 24 has
A bimetal 25 is attached that bends due to the heat generated by the heater 24, and an adjustment screw 26 is screwed onto the tip of the bimetal 25. Furthermore, 27 in the figure is a magnet, and this magnet 27
The armature 27a is opposed to the armature 27a. Further, 28 in the figure is a load-side fixed terminal connected to the heater 24 at one end.

As shown in Fig. 2, this circuit breaker has the R phase, S phase, T phase, and N phase sequentially from the left.The N phase has a heater 24 as a tripping element, a bimetal 25, The magnet 27 and armature 27a are not attached.

Also, when this circuit or disconnector is in an open state,
The positions of the crossbar 8, arm holder 7, movable arm 5, and movable contact 6 are different between the three phases, R phase, S phase, and T phase, and the N phase, as shown in FIG. Here, l indicates the difference in opening distance between the movable arm 5 in the three phases of R phase, S phase, and T phase and the movable arm 5 in N phase.

Therefore, when operating the handle 18 to switch the circuit breaker which is in the open state to the closed state, the handle support 19 also rotates together with the handle 18 by operating the handle 18. The spring 21 engaged with the support 19 is stretched. When the handle 18 exceeds a certain position (the dead center of the spring 21), the spring 21 starts to contract, causing the upper link 11 to rotate counterclockwise about the pin 15 as a fulcrum. So both links 1
The opening angles of 0 and 11 become large, and the arm holder 7 rotates clockwise around the crossbar 8.
Along with this, the movable arm 5 also rotates together with the arm holder 7, and the circuit and disconnector are brought into the closed state. Here, the movable arm 5 of the N phase and the movable arm 5 of the other three phases (R phase, S phase, T phase) operate in accordance with the rotation of the crossbar 8 and arm holder 7. There is. However, as shown in FIG. 3, the distance to the stationary contact 4 of the N-phase movable arm 5 is shorter than that of the other phase movable arms 5 by l. Therefore, the temporal relationship when the movable arm 5 performs the closing operation based on a certain time is that the N phase is completed earlier by the time corresponding to the opening distance difference l than the other three phases. Become. Note that after the N-phase movable contact 6 contacts the fixed contact 4,
By elastically deforming the spring 9, the crossbar 8
This will allow for rotation.

Conversely, when switching a circuit or disconnector from the closed state to the open state, the N-phase movable arm 5 is slower than the other three phase movable arms 5 by the time equivalent to the open distance difference l. Open the pole. That is, R phase, S
Even though the arm holder 7 is attached to the common crossbar 8 for phase, T phase, and N phase,
The N phase is turned on earlier and opened later than the other three phases.

[Problems with background technology]

In the conventional 4-pole type circuit breaker, the N phase and the other 3
The mounting position and rotational center position of the arm holder 7 are the same for the phases, and the time difference between early entry and late switching in the N phase when closing and opening is mainly due to the opening distance difference l of the movable arm 5. It had been adjusted. Therefore, the only way to increase the time difference is to increase the opening distance difference l between the movable arm 5 of the N phase and the movable arm 5 of the other three phases. However, there was a problem in that the cutting performance deteriorated, and a time difference of only a few milliseconds could be obtained at most. However, when adjusting the load current in a 3-phase 4-wire circuit, the arcing time of each phase varies, so
With a time difference on the order of seconds, there is a risk that the N phase will arc or break before the other phases. Therefore, considering the variation in arc time, at least 10 msec
A certain degree of time difference is desirable, and when an electronic device is connected to a conventional four-pole type disconnector as a load, there is a risk that the electronic device will burn out due to overvoltage generated due to unbalanced load voltage.

[Purpose of the invention]

The present invention was made based on the above circumstances, and its purpose is to be able to simultaneously operate four phases by operating a common handle, and to operate the N phase, which is a neutral pole, with a simple configuration. To provide a four-pole type circuit and disconnector capable of maintaining a sufficient time difference between early on and late on and off with respect to other three phases.

[Summary of the invention]

The 4-pole type circuit breaker of the present invention includes a common crossbar for 4 phases that rotates in response to closing or opening operations, and an R-phase, S-phase, and T-phase that rotates together with this crossbar. an arm holder, and an R phase connected to the arm holder and causing a movable contact to move toward and away from a fixed contact as the arm holder rotates;
S-phase and T-phase movable side arms, a support that rotates together with the crossbar, and a support that is rotatably supported by the crossbar and rotates with the rotation of the crossbar in the closing direction. The N-phase arm holder rotates together with this, and this N-phase arm holder rotates together with this.
an N-phase movable arm that is connected to a phase arm holder and moves a movable contact toward and away from a fixed contact as the arm holder rotates; and an N-phase movable arm that is attached to the N-phase arm holder in the opening direction. The spring that presses,
The rotation of the crossbar in the closing direction holds the N-phase arm holder in the closing position, and the rotation of the crossbar in the opening direction holds the N-phase arm holder in the closing position.
and a catch that releases the hold on the N-phase arm holder and enables the N-phase opening operation when the crossbar further rotates in the opening direction after the phase and T-phase opening operations have started. This feature allows simultaneous operation of four phases using a common handle operation, and with a simple configuration, it is possible to maintain a sufficient time difference between the early on and late off of the N phase with respect to the other three phases. You can get effects such as:

[Embodiments of the invention]

The present invention will be described below based on an embodiment shown in the drawings.

FIGS. 4 and 5 are front views showing the N-phase open state and closed state of the four-pole circuit breaker, respectively. Further, FIG. 6 is a plan view showing a part of FIG. 5, FIG. 7 is a diagram showing the difference in opening distance between the N phase and the other three phases, and FIGS. 8 and 9 are FIG. 3 is an exploded perspective view of an N-phase mechanical section. In addition, the other three phases (R phase,
(S phase, T phase) are similar to the conventional ones shown in FIGS. 1 and 2. Components similar to those in FIGS. 1 and 2 are designated by the same reference numerals.

In the figure, reference numeral 29 is an N-phase arm holder, which has an engaging pin 29a at one end, and whose center portion is rotatably attached to a circular section 8a formed in a part of the cross bar 8 common to the four phases. Supported. An N-phase movable arm 30 is rotatably connected to one end of this arm holder 29 via a pin 30a. This movable arm 30 has a movable contact 3.
1 is provided. Further, a support 32 is attached to the cross bar 8 and rotates together with the cross bar 8. As shown in FIG. 8, the support 32 has a bent holder position regulating piece 33 and a release piece 34, and the holder position regulating piece 33 prohibits the arm holder 29 from rotating counterclockwise. That's what I do. In the figure, 35 is a frame fixed to the case 2, and a tension coil spring 37 is stretched between a spring receiving pin 36 protruding from the frame 35 and the pin 30a. A compression coil spring 38 is inserted between the arm holder 29 and the movable arm 30 to press the movable contact 31 against the fixed contact 4, and the elasticity of the spring 38 causes one end of the movable arm 30 to is pressed against the holder position regulating piece 33 of the support 32. Furthermore, the frame 35 has a catch 39.
are rotatably connected via a pin 39a. A torsion spring 40 is attached to the pin 39a, and both ends of the spring 40 are engaged with the frame 35 and the catch 39.
is always biased counterclockwise. The rotating end of the catch 39 is provided with an inclined edge 41 on which the engagement pin 29a slides, and this inclined edge 41
An engagement stepped portion 42 is provided continuously to engage the engagement pin 29a. Also catch 39
A pressure receiving pin 43 that is pressed by the release piece 34 of the support 32 is protruded from the center of the support 32 .

Next, the operation of this embodiment will be explained.

First, the closing operation of the circuit or disconnector, that is, switching from the open state shown in Fig. 4 to the closed state shown in Fig. 5, is as follows:
It is done as follows. When the handle 18 is rotated in the closing direction, the movement is transmitted to each phase via the crossbar 8. At this time, the N phase supports 32
rotates clockwise together with the crossbar 8, and presses the arm holder 29 with the holder position regulating piece 33. Therefore, the arm holder 29 also rotates together with the crossbar 8 together with the movable arm 30, bringing the movable contact 31 into contact with the fixed contact 4 of the power supply fixed terminal 3, and further rotating the crossbar 8. As progresses, the compression coil spring 38 is compressed in the N phase, and the fixed contact 4 and the movable contact 3
1, contact pressure is applied by the elasticity of the compression coil spring 38. Also, as the closing operation progresses, N
In the phase, the engagement pin 29a of the arm holder 29 slides on the inclined edge 41 of the catch 39, but when the engagement pin 29a comes off the inclined edge 41, it engages with the engagement step 42 of the catch 39. Further, in the other three phases, the same closing operation as in the case of FIGS. 1 and 2 is performed, and with this, the closing operation of the breaker and disconnector is completed. Here, the time difference between the N phase and the other three phases is determined by the opening distance l' shown in FIG.

Next, the opening operation, that is, switching from the closed state shown in FIG. 5 to the opened state shown in FIG. 4, is performed as follows. When the handle 18 is rotated in the opening direction,
The crossbar 8 also rotates in the same direction. As a result, in the R, S, and T phases, the movable arm holder 7 rotates integrally with the crossbar 8 as in the case of FIG. 1, but in the N phase, the support 32 rotates integrally with the crossbar 8. do. Therefore, in the three phases R, S, and T, the opening operation of the arm holder 7 starts immediately, whereas in the N phase, even if the support 32 starts rotating counterclockwise, the opening operation of the arm holder 7 does not occur. Since the engagement pin 29a of the arm holder 29 is engaged with the engagement step 42, the arm holder 29 and the movable arm 3
The position of 0 does not change and the closed state is maintained. Then, the cross bar 8 further rotates counterclockwise, and when it reaches a certain position, the release piece 34 of the support 32 comes to push the pressure receiving pin 43 of the catch 39. Therefore, the catch 39 rotates clockwise against the torsion spring 40, and the engagement stepped portion 42 moves against the engagement pin 2.
When the arm holder 29 is removed from the position 9a, the arm holder 29 is pulled by the tension coil spring 37 and rapidly rotates counterclockwise. As the arm holder 29 rotates, the movable arm 30 also rotates counterclockwise about the pin 30a, and then the arm holder 29 rotates counterclockwise about the pin 30a.
9 and the crossbar 8, the N phase is opened, and the opening operation of the breaker is completed.

In this way, the N-phase opening operation is not started at the same time as the rotation operation of the crossbar 8, but when the crossbar 8 reaches a predetermined position, a part of the support 32 presses the catch 39, and the arm holder 29 and catch 3
When the engagement state with 9 is released, the electrode opening operation is started. On the other hand, in the other three phases, the arm holder 7 rotates at the same time as the crossbar 8, so the opening operation starts from the time when the crossbar 8 starts rotating.

Therefore, the delay time difference can be set sufficiently larger than that of the N-phase of the conventional 4-pole type circuit and disconnector, and the time difference setting of the delay time difference is the difference l between the opening distances of the movable arms 5 and 30. ′, the difference in opening distance can be easily adjusted.
Differences caused by repeated operations on setting time differences are also reduced.

〔Effect of the invention〕

As described in detail above, according to the present invention, the time difference between quick turn-on and slow turn-off of the N phase can be set without depending on the difference in opening distance between the arms of the N phase, R phase, S phase, and T phase.
The N-phase arm holder and catch, which are rotatably supported on the crossbar and rotate together with the support during the closing operation, enable operations to be carried out at a predetermined time difference, thereby preventing early ON/late termination of the N-phase. The time difference can be set sufficiently large, and even if there are variations in arc time, it can be set so that the N phase is reliably cut off after the other three phases. Therefore, overvoltage damage due to load imbalance can be reliably prevented even for loads such as electronic equipment.

In addition, in the N phase, when the crossbar rotates to a predetermined position, the engagement between the catch and the arm holder is released and the opening operation is started, resulting in a simple configuration. .

[Brief explanation of drawings]

Figures 1 to 3 show conventional examples. Figure 1 is a longitudinal sectional view of a four-pole type circuit breaker, Figure 2 is a partially cutaway plan view, and Figure 3 is a partially cutaway plan view. Comparison diagrams of the movable arm positions of the N phase and the other three phases, Figures 4 to 9 show an embodiment of the present invention, and Figure 4 shows the N phase in a four-pole circuit breaker. Fig. 5 is a front view showing the N-phase closed state, Fig. 6 is a partial plan view, and Fig. 7 shows the N-phase and other three
Comparison diagram of movable arm position with phase, Figures 8 and 9
The figure is an exploded perspective view showing the N-phase mechanical part. 3...Power supply side fixed terminal, 4...Fixed side contact,
5, 30...Movable side arm, 6,31...Movable side contact, 7,29...Arm holder, 8...Cross bar, 18...Handle, 37...Tension coil spring, 38...Compression coil spring, 39 ...Catch, 40...Torsion spring.

Claims (1)

[Scope of Claims] 1. A common crossbar for four phases that rotates in response to closing or opening operations, and R-phase, S-phase, and T-phase arm holders that rotate together with this crossbar;
R-phase, S-phase, and T-phase movable arms that are connected to this arm holder and move the movable contacts toward and away from the fixed contacts as the arm holder rotates, and rotate together with the crossbar. an N-phase arm holder that is rotatably supported by the crossbar and rotates together with the crossbar when the support rotates in the closing direction; and the N-phase arm. an N-phase movable arm that is connected to the holder and causes the movable contact to move toward and away from the fixed contact as the arm holder rotates; and a spring that biases the N-phase arm holder in the opening direction. The N-phase arm holder is held in the closing position by the rotation of the crossbar in the closing direction, and the opening operations of the R, S, and T phases are started by the rotation of the crossbar in the opening direction. The four-pole circuit is further equipped with a catch that releases the hold of the N-phase from the arm holder and enables the N-phase to open when the crossbar further rotates in the opening direction. Disconnector. 2. The 4-pole circuit breaker according to claim 1, wherein the crossbar and the support have a common rotation axis.