KR920010234B1 - Control box for electricity - Google Patents

Abstract

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Description

Collective switchgear

1 is a cross-sectional view showing an embodiment of the present invention.

2 is a partially broken front view with the door removed.

3 is a right side view of FIG. 2 partially broken with the side cover removed.

4 and 5 are cross-sectional views of the unit withdrawn.

6 is a contact state of the power bus and the power contactor.

7 is a main structural view showing an example of a unit position regulating means.

8 is a state diagram of the unit position and the position control means.

9 is a contact state of a power bus and a power contactor, and a clip and a load blade.

10 is a contact state in another example of a power bus and a power contactor.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a collective switchgear for stacking and storing a plurality of unit units in a single stage, and more particularly, to a collective switchgear for simplifying inspection of a unit unit.

In the case of intensive control of a large number of electric motors, a collective switchgear comprising a control unit that is bundled for each unit, which is formed by stacking unit units in a plurality of stages and storing them collectively is used. The collective switchgear forms a plurality of chambers by means of partition plates in the outer frame, and can be housed so that unit units can be inserted into and removed from each room. In recent years, the collective type switchgear that has been practically used is electrically connected to a power bus and a load side terminal when a unit unit is inserted and stored. The connection with the load side terminal is performed by means described in, for example, Japanese Patent Laid-Open No. 53-68836.

By the way, the unit unit houses a circuit breaker for receiving power from an AC power source, an electromagnetic contactor for controlling the operation and stopping of the motor, and a thermal relay for protection from overcurrent. In order to improve the reliability of the collective switchgear, it is necessary to check whether the unit unit, especially the magnetic contactor, is operating normally. And when checking the operation state, the operation of the motor must be avoided in view of unnecessary power consumption and safety.

Conventionally, to inspect a unit unit, the unit is taken out to the inspection position, and the electrical connection between the power bus and the load terminal is in a disconnected state. On the other hand, the operation circuit power supply of the magnetic contactor is obtained from the load side of the circuit breaker. If the unit unit is taken out to the inspection position, the operation circuit power of the magnetic contactor is lost. Therefore, for example, as described in Japanese Patent Application Laid-Open No. 58-189709, a power supply for inspection is prepared, and a power supply unit is supplied to the unit unit using a floc. Since the inspection is carried out for each unit unit, the flocks must be replaced every time one unit unit is inspected, which significantly reduces the inspection work efficiency. In addition, an inspection plug must be attached to each unit, which is one of the factors that complicates the unit configuration.

An object of the present invention is to provide a collective switchgear that can simplify the inspection of the unit unit, and can improve the inspection work efficiency.

The present invention is characterized in that when the unit unit is drawn out to the operation test position, the power contactor and the power bus are in an electrically connected state, and the load side contactor and the load side terminal are electrically disconnected.

Next, one Example of this invention is shown to FIG. 1 thru | or FIG.

1 is a cross sectional view of a state in which a unit unit is inserted into a normal position. 1 omits equipment such as a circuit breaker.

FIG. 2 is a front view partially broken in the state of removing the door, and FIG. 3 is a right side view of FIG. 1 partially broken in the state of removing the side cover.

1 to 3, the back plates 4 of the side frames 1A and 1B of the collective switchgear are attached with screws (not shown). The inside of the switchboard is divided into a unit storage chamber 11 and a power distribution processing chamber 13 by the frame 5 arranged in the vertical direction of the switchboard. A front door 2 for the unit storage chamber 11 and a front door 3 for the power distribution processing chamber 12 are provided on the front of the switchboard. In the power distribution processing chamber 12, a control circuit wire (not shown) or a main circuit cable 19 to an electric motor is stored. The unit storage chamber 11 is formed as a partition by the partition board 7 fixed between the side frame 1A and the frame 5 of the box 1. The partition plate 7 is fixed in plural sheets in the vertical direction of the switchboard according to the longitudinal size of the unit unit 9U, and forms a plurality of unit storage chambers 11. The unit 9U is stored in each unit storage chamber 11. The partition plate 7 is formed in a U-shaped cross section with a shallow bottom in the front-rear direction. The unit bracket 9 of the unit 9U is formed in a lateral L-shape, as is apparent from FIG. 3, and has a protrusion standing upright over the entire edge. On the front side of the vertical surface 9a of the unit bracket 9, a circuit breaker 30, an electromagnetic contactor 31, and a thermoelectric relay 32 are attached. Further, a contactor support 35 made of an insulating material for supporting the power contactor 37 is also attached to the vertical surface 9a. Rails 8A and 8B extending in the lengthwise direction of the switchboard are fixed on the partition plates 7 at both lower corners of the unit storage chamber 11. The unit bracket 9 (unit 9U) slides on the rails 8A and 8B and is removed from the unit storage chamber 11.

On the bottom of the partition board 7, a blade support 15 made of an insulating material extending from the center of the switchboard to the power distribution processing chamber 12 is fixed. Inside the blade support 15 is a blade 17 formed of three conductive materials of different lengths. One end of the blade 17 is bent in the vertical direction, respectively, to form a contact portion 17a to which a clip (load side contactor) 34 to be described later comes into contact with. The other end of the blade 17 is bent downward along the end of the blade support 15 on the wiring processing chamber 12 side to form a terminal portion (loading terminal) 17b. The load cable 19 is fastened by the bolt 20 to the terminal part 17b. A rectangular cutout 13 is formed in the horizontal surface (bottom surface) 9b of the unit bracket 9. The clip supporting member 33 mounted with the insulating material is screwed to the fixing sheets 14A and 14B across the cutout portion 13. The fixing sheets 14A and 14B are fixed to the bottom surface 9b of the unit bracket 9.

Three grooved clips 34 are attached to the clip support member 33. Details of the clip support member 33, the clip 34, and the like are described in, for example, Japanese Patent Laid-Open No. 53-68836. In the state where the unit 9U is completely stored in the unit storage chamber 11, as shown in FIG. 1, the clip 34 clamps the contact part 17a of the blade 17, and comes into contact.

On the other hand, at the rear of the unit storage chamber 11, three vertical bus lines 21 are supported by the insulation case 23 in the vertical direction of the switchboard. The insulating case 23 is made of a transparent insulating material. In addition, in FIG. 1, in order to simplify the illustration, only the vertical bus bar 21 of one phase is shown as surrounded by the insulating case 23. As shown in FIG. The vertical busbar 21 is formed in a groove shape with a conductive material as shown in FIG. 6, and is bent in a U-shape so that the tip is directed outward at both ends of the opening side to form flanges 21a and 21b. have. Further, a plurality of accommodating holes (not shown) for accommodating the power contactor 37 are formed in the abdomen 21c of the trough-shaped vertical bus line 21 as shown in FIG. The vertical buses 21 (including the insulation case 23) are sandwiched by the bus bar support 29 so that the phases are kept in parallel. The busbar support 29 is screwed with a bolt 27 to the support trough 25 extending in the switchboard width direction.

Three power contactors 37 are attached to the support 35. As shown in FIG. 6, the power contact 37 has two contact pieces 37a and 37b which are elastically deformable, and is comprised in the arrow direction. When the power contact 37 is inserted into the vertical bus 21, both contact pieces 37a and 37b are press-contacted between the U-shaped flanges 21a and 21b of the vertical bus 21. 6A and 6B show a state in which the contact pieces 37a and 37b are press-contacted between the U-shaped flanges 21a and 21b of the vertical bus line 21, and this figure (a) shows the contactor 37. The tip of is shown in the state of being inserted into the receiving hole 22 of the vertical bus bar 21.

One end of the power contactor 37 passes through the support 35 and is attached to the support 35. One end of the power contact 37 projecting in the unit 9U constitutes a terminal. The power supply side terminal of the wiring breaker 30 is connected to the terminal which constitutes one end of the power contactor 37 by the cable 50. The load side terminal of the wiring breaker 30 is connected to the power supply side terminal of the magnetic contactor 31 by a cable 51. The operation circuit power supply of the magnetic contactor 31 is obtained from two of three phases of the load shaft terminal of the circuit breaker 30 or the power supply terminal of the magnetic contactor 31. The copper plate 52 is electrically connected between the load side terminal of the magnetic contactor 31 and the power terminal of the thermal relay. The load side terminal of the thermal relay 32 is connected by a cable 53 to a clip 34 fixed to the clip support member 33.

On the bottom face 9b of the unit bracket 9, three locking holes 40, 41, 42 for restricting the unit insertion position are formed at predetermined intervals in a direction toward the inside of the unit. In addition, as shown in FIGS. 7 and 8A, the lock button switch 6 is fixed to the partition plate 7 by screws 38, and the movable button 6A of the button switch 6 has a locking hole. Protruding from (40) to (42) restricts the insertion of the unit bracket (9). The lock button switch 6 is mechanically held in the state of FIG. 8B by pressing the operation button 6A once. When in this holding state, pressing with the unit bracket 9 as shown in Fig. 8C releases the mechanical holding and rises by the spring force (not shown). When the unit bracket 9 is completely housed in the unit storage chamber 11, the movable button 6A of the lock button switch 6 protrudes from the locking hole 40 as shown in Figs. 1 and 8a. .

In this configuration, when the unit bracket 9 is completely housed in the unit storage chamber 11, the power contactor 37 is inserted into the vertical bus bar 21 as shown in FIG. Both contact pieces 37a and 37b are press-contacted between U-shaped flanges 21a and 21b through 22. The power contact 37 is inserted into the vertical bus 21 as shown in FIG. 6A and is in contact with the vertical bus 21. In this state, the clip 34 is in contact with the contact portion 17a of the blade 17. When the contact state between the vertical bus line 21, the power contactor 37, the clip 34, and the blade 17 is equal to that of Fig. 9a, the enable button 6A of the lock button switch 6 is in a normal position as shown in Fig. 8a. It protrudes from the locking hole 40 which shows P1.

When checking the unit 9U when the lock button switch 6 is located in the locking hole 40 indicating the normal position P1, the wiring breaker 30 by an operation means (not shown) attached to the door 2 first. Trip) When the circuit breaker 30 is tripped, the door 2 can be opened and closed. When the inspector presses the movable button 6A of the lock button switch 6 while the door 2 is opened, the state becomes as shown in FIG. 8B. Next, when the unit bracket 9 is pulled out to the front, the bottom face 9b of the unit bracket 9 is in contact with the inclined surface of the movable button 6A. When the unit bracket 9 is pulled out to the front, the operation button 6A is pulled out. ) Is pressed further down from the position of FIG. 8b to become like FIG. 8c. When the unit bracket 9 is pulled out to the front again from the state of FIG. 8C, the movable button 6A protrudes from the locking hole 40 in the operation test position P2.

The movement of the unit bracket 9 is prevented because the movable button 6 protrudes from the locking hole 41. Then, when the movable button 6 protrudes from the locking hole 41, it is as shown in FIG. 4 when the unit bracket 9 is pulled out to the operation test position P2. That is, while the vertical bus 21 and the power contact 37 are in contact, the clip 34 and the blade 17 are in the open state. The state of the blade 17 of the vertical bus line 21, the power contactor 37, and the clip 34 is as shown in FIG. 9B. When the unit 9U is taken out to the operation test position P2, the vertical bus 21 and the power contactor 37 are in contact with each other, as shown in FIG. 9 (b), to secure the operation circuit power of the magnetic contactor 21. can do. In this state, the operation test of the magnetic contactor 31 is performed. The operation test of the magnetic contactor 31 is also performed including a conditional circuit which gives the magnetic contactor 31 an opening and closing condition.

When the operation test of the magnetic contactor 31 is completed with the unit 9U in the operation test position P2, the operation button 6A of the lock button switch 6 is pressed, and then the unit bracket 9 is pulled out, and the operation button ( 6A) protrudes from the locking hole 40 to become the state of FIG. At this time, the state of the vertical bus 21, the power contact 37, the clip 34 and the blade 17 is as shown in Figure 9c. Stop the unit (9U) at the check position P3. With the unit (9U) in the inspection position P3, perform a mechanical inspection such as the contact state of the contact. If there is no abnormality in the mechanical inspection, press the operation button 6A of the lock button switch 6, and then insert the unit bracket 9 into the unit storage compartment 11 to close the door 2 with the normal position P1. To exit.

The unit is inspected as described above, but the vertical bus (power bus) 21 and the power contactor 37 are in contact with each other, and the clip 34 and the blade 17 on the load side are in the open state (operation). Test state), and the operation of the magnetic contactor in this operation test state. The inspection of the unit can be performed simply by pulling out the unit to the front, thereby improving the inspection work efficiency.

Next, the above-described embodiment can be similarly performed even if the vertical busbar has a groove-shaped cross section.

FIG. 10 shows the contact state with the power contact 46 in the case where the vertical bus line 45 is flat. FIG. 10A shows the state when the unit 9U is in the normal position, and the figures (b) and (c) are in the operation test position and the inspection position.

As described above, according to the present invention, since the operation of the magnetic contactor can be checked by simply pulling out the unit to the operation test position, the inspection can be easily performed and the point RJA work efficiency can be remarkably improved.

In the above-described embodiment, the load side terminal is provided in the wiring processing chamber, but the present invention can of course be employed even if the load side terminal is provided on the unit back side. The provision of the load side terminal on the back side of the unit is carried out by applying the load side terminal to the busbar supporting member for fixing the position of the vertical bus, as the present applicant previously proposed in Japanese Patent Application No. 58-179751 (Japanese Patent Application No. 60-74906). This can be done by providing.

Claims (7)

A collective switchgear in which a power unit and a load-side contactor fixed to the unit unit are electrically connected to a power bus or a load-side terminal, respectively, by storing the insertable unit unit in the unit storage room. And said power contactor and said power busbar are in an electrically connected state when drawn out to the operation test position, and said load-side contactor is configured such that said load-side terminal is electrically disconnected. 2. The collective switchgear according to claim 1, wherein the collective switchgear comprises a blocking means for preventing the insertion of the unit unit when the unit unit is pulled out to the operation test position. The collective switchgear according to claim 1, wherein a wiring processing chamber is provided on a side surface of the unit storage chamber, and one end of a load side blade constituting the load side terminal protrudes from the wiring processing chamber. 2. The power supply busbar according to claim 1, wherein the power busbar has a pair of flanges bent in a U-shape so as to have a cross section in the shape of a groove, and a tip thereof is outwardly at both ends of the opening side, and the pair of flanges sandwich the power contactor. Collective switchgear characterized in that to be. 5. The collective switchgear according to claim 4, wherein the power bus is surrounded by an insulation cover, and the insulation cover has a receiving hole for accommodating the power contactor. 2. The collective switchgear according to claim 1, wherein the power bus is flat, and the flat is sandwiched between the power bus and the power contact. 2. The collective switchgear according to claim 1, wherein a pair of rails for guiding the unit unit in a slide is provided at both lower corners of the unit storage chamber.

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