CN203800401U - Bypass device, drawable chassis and power distribution system - Google Patents

Abstract

Embodiments of the present disclosure relate to a power distribution system, comprising: a circuit breaker (1), electrically connectable to a busbar (M), and electrically connectable to a client circuit; The customer terminal (21) of the customer circuit, and the bus terminal (22) that can be electrically connected to the bus (M), and the customer terminal (21) is electrically connected to the bus terminal (22) ; wherein the bypass (2) is movable between a first position electrically connected to the busbar (M) and the client circuit and a second position disconnected therefrom. The power distribution system can disconnect the circuit breaker from between the busbar and the customer circuit without interrupting the power supply to the customer, so as to inspect or maintain the circuit breaker. A bypass and chassis for the power distribution system are also disclosed.

Description

Bypass, cradle and power distribution system

technical field

Various embodiments of the present disclosure relate to a bypass, a chassis, and a power distribution system composed thereof.

Background technique

Low-voltage circuit breakers are components used in low-voltage power distribution circuits to carry current, distribute electric energy, and cut off power to protect equipment and circuits in the event of overload or short circuit. Drawer type air circuit breaker (also known as universal circuit breaker or frame type circuit breaker) is very popular among users because of its convenience in use and maintenance. It does not need to disassemble the busbar during maintenance, as long as the circuit breaker body is removed from the drawer Just shake out. However, in some occasions, such as blast furnaces in iron and steel plants, reaction pools in chemical plants, etc., because the power cannot be cut off, this convenient maintenance becomes useless, resulting in hidden dangers caused by the lack of regular maintenance of circuit breakers. How to repair the circuit breaker or replace the damaged circuit breaker under the condition of uninterrupted power supply is the problem solved by this technology.

Utility model content

In view of the above reasons, one object of the present disclosure is to provide a power distribution system, which is used to solve at least part of the problems existing in the above-mentioned existing power distribution systems.

According to one aspect of the present disclosure, there is provided a power distribution system comprising: a circuit breaker electrically connectable to a bus bar and electrically connectable to a customer circuit; a bypass having a customer connection electrically connectable to the customer circuit terminal, and a bus bar terminal electrically connectable to the bus bar, and the client connection terminal is in electrical communication with the bus bar terminal; wherein the shunt is movable between a first position and a second position, in the first position, The bypass is electrically connected to the bus and the customer circuit, thereby bypassing the circuit breaker, and in the second position, the bypass is electrically disconnected from the bus and the customer circuit. The bypass device provides a bypass current path between the customer circuit and the busbar, and the circuit breaker can be disconnected from the busbar and the customer circuit without interrupting the power supply to the customer, so that the circuit breaker can be repaired or repaired. maintain.

According to an embodiment of the present disclosure, an interlock mechanism is provided between the circuit breaker and the bypass, so that when the circuit breaker is in the disconnected state, the bypass cannot move from the first position to the second position. two positions, or move from the second position to the first position. Through the interlock mechanism, it can prevent the operator from connecting the bypass between the busbar and the client circuit or disconnecting it when the circuit breaker is in the disconnected state, so as to avoid the generation of arc and electric force and thus hinder the operation. injury to personnel. Thus, the interlock mechanism provides assurance of safe operation of the bypass.

According to an embodiment of the present disclosure, the power distribution system further includes a cradle, the bypass device is movably installed in the cradle, a handle hole is provided on the cradle, and a handle can be inserted into the handle hole Shake to move the bypass relative to the cradle between the first position and the second position.

According to an embodiment of the present disclosure, the interlock mechanism includes an interlock provided on the cradle, an interlock lever capable of driving the interlock to expand and contract, a linkage connected to the interlock lever, and a linkage connected to the linkage. Main shaft position identification part; when the main shaft of the circuit breaker rotates to the closing position, the main shaft position identification part is driven to rotate by the driving rod on the main shaft of the circuit breaker, thereby driving the interlocking rod through the linkage to press the Interlocking to the retracted position, so that the interlock does not block the crank hole, so that the crank can be inserted into it to move the bypass; and when the main shaft of the circuit breaker rotates to the opening position, the main shaft position identification The component is driven by the driving rod on the main shaft of the circuit breaker to rotate in the opposite direction, so that the interlock lever is driven by the linkage and no longer presses the interlock, so that the interlock resets to the position of blocking the rocker hole , so that the crank cannot be inserted into it to move the bypass.

According to an embodiment of the present disclosure, there is also a spring on the chassis, which is configured to cooperate with the stepped surface on the interlocking lever, so that when the main shaft of the circuit breaker rotates to the opening position, the spring pushes the The interlock lever no longer depresses the interlock to reset the interlock from the retracted position so that the interlock blocks the crank hole so that the crank cannot be inserted therein to move the bypass.

According to an embodiment of the present disclosure, the linkage member is a sleeve cable, and two ends of the sleeve of the sleeve cable are respectively fixed on the chassis.

According to one embodiment of the present disclosure, the linkage is a link or a tensioned cable.

According to another aspect of the present disclosure, there is also provided a bypass that is applicable to the above-mentioned power distribution system, including a customer terminal that can be electrically connected to a customer circuit and a bus terminal that can be electrically connected to a bus bar, wherein the customer A terminal terminal is in electrical communication with the bus bar terminal.

According to another aspect of the present disclosure, there is also provided a cradle applicable to the above power distribution system, including a movable support configured to support a bypass or a circuit breaker; the cradle also includes a handle hole, a The rocker can be inserted into the rocker hole to shake to move the bypass device relative to the chassis; the chassis is also provided with a retractable interlock and an interlock lever that can drive the interlock to retract , a linkage piece connected to the interlock lever and a spindle position identification piece connected to the linkage piece, in the retracted position of the interlock, the interlock does not block the handle hole so that the crank handle can be inserted therein; In the non-retracted position of the interlock, the interlock blocks the rocker hole so that the rocker cannot be inserted therein.

According to an embodiment of the present disclosure, a spring is also provided on the drawer, which is configured to cooperate with the stepped surface on the interlocking lever to push the interlocking lever not to press the interlock so that the interlock is released from the The retracted position resets to the unretracted position so that the interlock blocks the crank hole.

Description of drawings

These and other objects, features and advantages will become apparent from the following detailed description of exemplary embodiments when read in conjunction with the accompanying drawings, in which:

FIG. 1 is a perspective view of a power distribution system according to an embodiment of the present disclosure;

Figure 2 is a perspective view of a bypass according to an embodiment of the present disclosure;

Fig. 3 is the right side view of the shunt in Fig. 2;

Fig. 4 shows the customer terminal and the bus terminal of the bypass device in Fig. 2;

Figure 5 shows a bypass mounted on a cradle according to an embodiment of the present disclosure;

Figure 6 is a partially enlarged view of the cradle in Figure 5 with the interlock in a protruding position;

Fig. 7 is a partially enlarged view of the cradle in Fig. 5, wherein the interlock is in the retracted position;

Figure 8 shows the interlock mechanism between the circuit breaker and the bypass;

Figure 9 shows the connection between the main shaft of the circuit breaker and the interlock mechanism.

Detailed ways

Reference will now be made to embodiments of the disclosure, one or more examples of which are illustrated in the accompanying drawings. The examples are provided by way of illustration of the disclosure and are not intended as limitations of the disclosure. For example, features illustrated or described as part of one embodiment may be used in another embodiment to yield still a further embodiment. This disclosure is intended to embrace these and other modifications and variations that are within the scope and spirit of this disclosure.

FIG. 1 is a perspective view of a power distribution system according to an embodiment of the present disclosure. The power distribution system includes a circuit breaker 1, which can be electrically connected to a bus M through a terminal, and can be electrically connected to a customer circuit through a terminal. The circuit breaker 1 controls the electrical connection or disconnection between the terminal connected to the busbar M and the terminal connected to the customer circuit through the closing and opening of the movable contact driven by the main shaft, so as to electrically connect the connected customer circuit To or from bus M. The circuit breaker 1 can be various known or future circuit breakers, and the movement of the main shaft of the circuit breaker can be controlled by various methods such as manual and program control to close or open the circuit breaker. According to needs, the circuit breaker 1 may have one or more sets of terminals (three sets of terminals are shown in FIG. 1 for connecting to the three-phase bus M).

The power distribution system also includes a bypass 2, which has a client connection terminal 21 electrically connected to the client circuit, and a bus terminal 22 electrically connected to the bus M, as shown in FIGS. 2-3 . The client connection terminal 21 and the bus terminal 22 are permanently electrically connected through a conductive connector 23 (see FIG. 4 ), and the electrically connected client connection terminal 21 and the bus terminal 22 can be integrally formed by a conductor. The bypass 2 may also have one or more than one set of connection terminals. In FIG. 2 a shunt 2 with three sets of terminals is shown.

According to an embodiment of the present disclosure, the bypass device 2 can move between a first position and a second position. In the first position, the bus bar terminal 22 of the bypass device 2 contacts the terminal of the bus bar M, and the bus bar terminal 22 of the bypass device 2 The customer terminal 21 is in contact with the terminal of the customer circuit, which is simultaneously connected to the customer terminal on the circuit breaker. Therefore, when the bypass 2 is connected between the bus M and the customer circuit at the first position, the bypass 2 and the circuit breaker 1 are connected in parallel between the bus M and the customer circuit, so that the bypass 2 provides Bypass circuit path from customer circuit to bus M not via circuit breaker 1. At this time, the user can disconnect the circuit breaker 1 from the bus M and the customer circuit to maintain the circuit breaker 1, and at the same time, the customer circuit is still electrically connected to the bus M through the bypass 2, so that the work of the customer circuit There will be no interruption. And when the bypass device 2 moves to the second position, the bypass device 2 is electrically disconnected from the bus M and the client circuit to remove the bypass current path, so that the circuit breaker 1 connected between the bus M and the client circuit It can function to control the on-off between the bus M and the client circuit.

Preferably, the bypass 2 and the circuit breaker 1 are respectively movably placed in the chassis 3 . A supporting member that can move in and out relative to the cradle 3 is provided inside the cradle 3 , such as a sliding guide rail or a pallet, to support the bypass 2 and the circuit breaker 1 . There is a handle hole 31 on the cradle 3 , and a handle can be inserted into the cradle hole 31 to shake to swing the bypass 2 or the circuit breaker 1 in or out relative to the cradle 3 . Therefore, the bypass 2 inside the chassis 3 can be moved to a first position in contact with the busbar M and the client circuit terminals and a second position out of contact with the busbar M and the client circuit terminals. Likewise, the circuit breaker 1 can also be moved to a first position in contact with the bus bar M and the customer circuit terminals and a second position out of contact with the bus bar M and the customer circuit terminals.

Since the busbar M usually carries extremely high voltage or current, directly disconnecting or connecting the electrical connection with the busbar M without passing through a circuit breaker with protective measures will generate an arc, which may ablate the electrical contacts and nearby parts, thereby damaging electrical equipment and possibly endangering the safety of operators. Moreover, due to the drastic change in the intensity of the induced magnetic field caused by the instantaneous switching on or off of a large current, a large electromotive force will be caused on the electrical equipment near the bus M (such as on the contacts of the bypass device 2), which may also endanger the safety of the operator. Therefore, it is not allowed to directly use the bypass 2 to disconnect or connect the bus M without passing through the circuit breaker 1 . That is to say, only when the circuit breaker connects the bus M and the customer circuit (that is, the circuit breaker is closed), it is allowed to connect the bypass 2 to the bus M or disconnect it from the bus M, because at this time the bypass The connection or disconnection of the switch 2 will not affect the connection state between the client circuit and the bus M, and thus will not cause arc or electromotive force.

In order to ensure that the bypass 2 cannot be connected to the bus M or disconnected from the bus M when the circuit breaker 1 is not closed, preferably, an interlock mechanism is provided between the circuit breaker 1 and the bypass 2 to So that when the circuit breaker 1 is in the disconnected (opening) state, the bypass device 2 cannot be moved from the first position to the second position, or from the second position to the first position, that is, the bypass device 2 cannot be moved .

Referring to accompanying drawings 5-9, in one embodiment, the interlock mechanism includes an interlock 32 arranged on the chassis 3, an interlock rod 33 that can drive the interlock 32 to expand and contract, and a linkage member connected to the interlock rod 33. 34 and the main shaft position identification part 35 connected to the linkage part 34. The interlock 32 protrudes forward from the bottom side of the cradle 3 to abut against the interlock lever 33, which can be retracted into the hole on the bottom side of the cradle 3 under the pressure of the interlock lever 33, and can be locked when the interlock lever 33 is not locked. When it is pressed again, it is reset by the spring arranged in the hole. The interlock 32 also has a blocking portion (not shown) integrated or interlocked with the interlock 32 in the handle hole 31 . When the interlock 32 was retracted, the blocking portion moved to a position that would not hinder the insertion of the crank handle into the handle hole 31, and when the interlock 31 was reset to protrude from the side of the drawer 3, the blocking portion would be on the crank handle. The hole 31 prevents the rocker from being inserted into the handle hole 31 . The interlocking rod 33 is L-shaped, one end of which is connected to the linkage 34 from the side of the cradle 3 , and the other end turns to the front of the cradle 3 so that the plane faces the protruding part of the interlock 32 .

According to an embodiment of the present disclosure, the main shaft position identification member 35 is rotatably mounted on the side wall of the chassis 3 on which the circuit breaker 1 is installed, one end of which is connected to the linkage member 34, and the other end has a protrusion to form a cam mechanism. The driving rod 11 installed on the main shaft of the driving contact of the circuit breaker 1 can revolve around the rotation center of the main shaft, thereby cooperating with the protrusion on the main shaft position identification part 35 to drive the main shaft position identification part 35 to rotate clockwise or counterclockwise .

When the circuit breaker 1 is in the closed state, the main shaft rotates to drive the driving rod 11 to revolve, thereby driving the end of the main shaft position identifying member 35 connected to the linkage 34 to rotate to the far end of the tension linkage 34 . In the embodiment of FIG. 8 , the linkage 34 is a casing cable (similar to a bicycle brake cable), and the two ends of the casing of the casing cable are respectively fixed on the cradle 3 and the mounting bracket 3 of the circuit breaker 1 . On the cradle 3 of the bypass device 2, one end of the cable in the bushing is connected to the main shaft position identification part 35, while the other end is connected to the interlock lever 33, and the cables can be pulled by the main shaft position identification part 35 relative to each other. in casing movement. Therefore, the tightening cable of the main shaft position identification part 35 will drive the interlock lever 33 to move to the rear of the chassis, so that the plane of the interlock lever 33 facing the protruding part of the interlock 32 will press the protruding part of the interlock 32 to shrink it. into (see Figure 7). The blocking portion of the interlock 32 in the crank hole 31 will thus be retracted (either deeper into the crank hole 31 or from a side hole wall of the crank hole 31 ) so that the crank hole 31 unobstructed. At this time, the operator can insert the handle into the handle hole 31 and shake the handle, thereby driving the bypass device 2 in the chassis 3 to move outward relative to the chassis 3, so that the customer at the rear of the bypass device 2 The terminal terminal 21 and the bus terminal 22 are out of contact with the client circuit terminal and the bus M terminal (reaching the second position) respectively, so as to disconnect the client circuit and the bus M electrically. At this time, the circuit breaker 1 is in the closing position, so the electrical connection between the client circuit and the bus M is still maintained, so that dangerous conditions such as arcing or electromotive force will not occur due to the disconnection of the bypass device 2 .

In the case that the linkage 34 is a cable, a spring 36 is also provided on the chassis 3 , which is configured to cooperate with the stepped surface 37 on the interlocking rod 33 . When the main shaft of the circuit breaker 1 rotates to the opening position, the main shaft position identification part 35 is driven by the drive rod 11 on the main shaft of the circuit breaker 1 to rotate in the opposite direction without tensioning the cable. At this time, the compressed spring 36 against the step surface 37 to push the interlock lever 33 to move forward of the chassis 3 without pressing the interlock 32 any more. The interlock 32 resets from the retracted position under the restoring force of the internal spring, so that the indented blocking part of the interlock 32 protrudes into the channel of the handle hole 31 to block the handle hole 31, so that the handle 4 cannot be inserted therein And move the bypass 2. In this way, in the open state of the circuit breaker 1, the operator cannot move the bypass device 2, so that it cannot be connected to or disconnected from the bus M, thereby preventing occurrence of arc and electromotive force. After the operator finds that the crank handle cannot be inserted into the handle hole 31, he will realize that the circuit breaker 1 has not been closed yet. Then, the operator can close the circuit breaker 1 , and the main shaft of the circuit breaker 1 drives the main shaft position identification part 35 to rotate and pull the linkage part 34 , so that the handle hole 31 is no longer blocked by the interlock 32 . At this point, the operator can insert the rocker into the rocker hole 31 and shake to safely move the bypass device 2 .

The linkage 34 can also be a link or a tensioned cable. Using a rigid connecting rod can drive the connecting rod and the interlocking rod 33 to move in the front and rear directions respectively to lock or open the crank hole 31 through the rotation of the main shaft position identification part 35 in two opposite directions, so the spring 36 can be omitted. However, if a tensioned cable is used, the spring 36 is necessary for the reset of the locking lever 33, because the spindle position identification part 35 can only pull the cable and the locking lever 33 in one direction. The direction of the tensioned cable can be changed by a mechanism such as a pulley to connect the cable from the circuit breaker 1 to the chassis 3 of the bypass 2, so that it can be adjusted for different relative orientations between the circuit breaker 1 and the bypass 2 The cables in between are tensioned.

The description of the present disclosure has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will occur to those skilled in the art. Those skilled in the art should understand that the methods and devices in the embodiments of the present disclosure may be implemented in software, hardware, firmware or a combination thereof.

Therefore, the embodiments are selected and described in order to better explain the principles and practical applications of the present disclosure and to enable others skilled in the art to understand the following content, that is, without departing from the spirit of the present disclosure, do All modifications and substitutions will fall within the protection scope of the present disclosure as defined by the appended claims.

Claims (10)

1. a distribution system, is characterized in that, comprising:

Circuit breaker (1), can be electrically connected to bus (M), and can be electrically connected to client circuit;

Bypass apparatus (2), there is the client binding post (21) that can be electrically connected to described client circuit, with the bus terminal (22) that can be electrically connected to described bus (M), and described client binding post (21) and described bus terminal (22) electric connection;

Wherein, described bypass apparatus (2) can move between primary importance and the second place, in described primary importance, bus (M) and described client circuit described in described bypass apparatus (2) electric connection, thereby circuit breaker described in bypass (1), and in the described second place, described bypass apparatus (2) disconnects and being electrically connected to described client circuit from described bus (M).

2. distribution system according to claim 1, it is characterized in that, between described circuit breaker (1) and bypass apparatus (2), be provided with interlocking device, so that when described circuit breaker (1) is during in off-state, described bypass apparatus (2) can not move to the described second place from described primary importance, or moves to described primary importance from the described second place.

3. distribution system according to claim 2, it is characterized in that, also comprise and take out frame (3), described in being installed on movably, takes out described bypass apparatus (2) in frame (3), described taking out on frame (3), have rocking handle hole (31), a rocking handle can insert in described rocking handle hole (31) and shake that described bypass apparatus (2) is moved between described primary importance and the described second place with respect to the described frame (3) of taking out.

4. distribution system according to claim 3, it is characterized in that, described interlocking device comprises takes out the interlocking (32) on frame (3), the main spindle's identification part (35) that can drive the flexible blocking lever (33) of described interlocking (32), be connected to the STATEMENT OF FEDERALLY SPONSORED (34) of described blocking lever (33) and be connected to described STATEMENT OF FEDERALLY SPONSORED (34) described in being arranged on;

Wherein, when the main shaft of described circuit breaker (1) rotates to closing position, described main spindle's identification part (35) is driven by the drive rod (11) on the described main shaft of described circuit breaker (1) and rotates, thereby drive described blocking lever (33) to press described interlocking (32) to punctured position by described STATEMENT OF FEDERALLY SPONSORED (34), make described interlocking (32) not block described rocking handle hole (31), the mobile described bypass apparatus (2) thereby described rocking handle (4) can insert wherein;

And when the main shaft of described circuit breaker (1) rotates to open position, described main spindle's identification part (35) is driven and in the opposite direction rotation by the drive rod (11) on the described main shaft of described circuit breaker (1), thereby drive described blocking lever (33) no longer to press described interlocking (32) by described STATEMENT OF FEDERALLY SPONSORED (34), make described interlocking (32) reset to the position of blocking described rocking handle hole (31), the mobile described bypass apparatus (2) thereby described rocking handle (4) can not insert wherein.

5. distribution system according to claim 4, it is characterized in that, described taking out, on frame (3), be also provided with spring (36), it is configured to coordinate with the step surface (37) on described blocking lever (33), while rotating to open position with the main shaft when described circuit breaker (1), described spring (36) promotes that described blocking lever (33) is no longer pressed described interlocking (32) so that described interlocking (32) resets from described punctured position, thereby described interlocking (32) is blocked described rocking handle hole (31), described rocking handle (4) can not be inserted wherein and mobile described bypass apparatus (2).

6. according to the distribution system described in claim 4 or 5, it is characterized in that, described STATEMENT OF FEDERALLY SPONSORED (34) is sleeve pipe cable, takes out on frame (3) described in the two ends of the sleeve pipe of described sleeve pipe cable are separately fixed at.

7. according to the distribution system described in claim 4 or 5, it is characterized in that, described STATEMENT OF FEDERALLY SPONSORED (34) is the hawser of connecting rod or tensioning.

8. applicable to the bypass apparatus of the distribution system of any one in claim 1-7,

It is characterized in that, comprise the client binding post (21) that can be electrically connected to client circuit and the bus terminal (22) that can be electrically connected to bus (M), wherein said client binding post (21) and described bus terminal (22) electric connection.

9. applicable to the frame of taking out of the distribution system of any one in claim 1-7, it is characterized in that, comprise movable support member, it is configured to support bypass apparatus (2) or circuit breaker (1);

The described frame of taking out also comprises rocking handle hole (31), and a rocking handle (4) can insert in described rocking handle hole (31) and shake that described bypass apparatus (2) is moved with respect to the described frame (3) of taking out;

At the described blocking lever (33) that is also provided with retractable interlocking (32) on frame (3), can drives described interlocking (32) indentation, the main spindle's identification part (35) that is connected to the STATEMENT OF FEDERALLY SPONSORED (34) of described blocking lever (33) and is connected to described STATEMENT OF FEDERALLY SPONSORED (34) taken out, retracted position in described interlocking (32), described interlocking (32) is not blocked described rocking handle hole (31) described rocking handle (4) can be inserted wherein; At the not retracted position of described interlocking (32), described interlocking (32) is blocked described rocking handle hole (31) can not insert wherein described rocking handle (4).

10. the frame of taking out according to claim 9, it is characterized in that, described taking out, on frame (3), be also provided with spring (36), it is configured to coordinate with the step surface (37) on described blocking lever (33), to promote, described blocking lever (33) is not pressed described interlocking (32) so that described interlocking (32) resets to not retracted position from described retracted position, thereby described interlocking (32) is blocked described rocking handle hole (31).