Feed line circuit breaker with vacuum switching chamber

IPC classes for russian patent Feed line circuit breaker with vacuum switching chamber (RU 2518193):

H01H33/66 - Vacuum switches

Another patents in same IPC classes:

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Vacuum dead-tank circuit breaker / 2498439

Vacuum dead-tank circuit-breaker contains at least one gas-filled tank with a hollow insulator inside thus forming a sealed chamber and vacuum arc-quenching chamber (VAQC) consisting of insulator with two flanges, at that one flange is connected hermetically to the first flange of the hollow insulator. Inside VAQC insulator there are moving and fixed contacts and bellows connected hermetically to the flange of VAQC insulator; insulation traction is connected to the moving contact; it passes through VAQC bellows and moving unit of the hollow insulator. At that the second flange of the hollow insulator is connected hermetically to gas-filled tank of the circuit-breaker.

Check method of vacuum circuit breaker of traction current rectifier functioning / 2496176

Invention relates to check method of functioning of vacuum circuit breaker (12) of traction rectifier with at least one four-quadrant actuator (2) of network side and pulsed rectifier (4) of load side, which are electrically connected in parallel via capacitor (C_ZK) of intermediate loop on the side of steady voltage; and with traction transformer (10) with at least one secondary winding (8), which outlets are connected to outlets (16, 18) of alternating voltage side of actuator (2), and which primary winding has possibility of connection to circuit alternating voltage (u _N) via vacuum circuit breaker (12). When circuit breaker (12) is opened, actuator (2) is controlled exactly when circuit alternating voltage (u _N) is located in time relative to input voltage (u _St) of actuator, so that differential voltage (Δu), determined between circuit alternating voltage (u _N) and input voltage (u _St) of actuator, complies with predetermined test voltage by amplitude. Then it is checked whether current flows from supply mains to actuator (2).

/ 2246776

/ 2247439

/ 2249873

/ 2249874

/ 2251172

/ 2260868

/ 2265254

/ 2273072

/ 2275708

/ 2276424

FIELD: electricity.

SUBSTANCE: circuit-breaker includes a parallel branch (4) with coupled vacuum chamber (6) for current switching. The branch does not function in normal conditions, at that current passes through it only when the circuit-breaker (2) starts its breaking action due to increase of current transfer from the main power line (1) to the branch (4). Thus the vacuum switching chamber (6) remains at rest in normal operating conditions.

EFFECT: less demanding requirements to selection of the vacuum chamber dimensions in order to meet strict electric and dielectric requirements for normal operation.

7 cl, 14 dwg

The technical FIELD

The present invention relates to a circuit breaker on the power lines (or power cable)with the vacuum chamber of the switch.

PRIOR art

Breakers and circuit breakers in the power lines or power cables for medium or high voltage often include buildings in which are located the switch contacts for relative movement between a position in contact with each other, corresponding to the circuit supply line, and a position with the division of their distance from each other corresponding to the opening line. This housing is filled with a dielectric fluid medium in which is immersed the switch contacts and which contributes to the interruption of the current through the arc extinction, which may remain after separation of the contacts of the switch from each other. In the past there have been proposed many different fluids (such as air, oil, nitrogen, and so on), but at present, as a rule, uses sulfur hexafluoride (SF₆), which has good dielectric properties and is therefore well suited for this purpose. But the use of this gas should be limited, because it has such disadvantages that the products of decomposition are toxic and corrosive and contribute to the greenhouse effect. In accordance with the laws the AI with this, it can be a stimulus to the use of vacuum chambers of the switch, which are also used in some circuit breakers, the contacts of the switch are inside these chambers, which are also the most effective in extinguishing currents of the arc discharge, but their use in modern breakers impossible without additional modifications for cost reasons, since the vacuum chamber of the switch that you want to use these breakers would be too cumbersome in terms of materials and dimensions that must be coordinated to meet the various electrical and dielectric requirements, such as the ability to withstand lightning strikes.

A BRIEF STATEMENT of the substance of the INVENTION

The present invention is to provide use of vacuum chambers switch economically available to the breakers. According to the main aspect of the invention is proposed circuit breaker line (or power cable) power supply, comprising a vacuum chamber of a circuit breaker having two switch contact arranged to move relative to each other and are able to take a closed position and open position, the circuit breaker is characterized in that it contains:

- movable switch connected to the power line and vypolnennym the possibility of the progress of the movement, during which he can take the position of the circuit line and the position of the opening line; and

- the branch of which is connected to the power line at one end of the branch, while the vacuum chamber of the switch included in the branch and is driven using the movable part located between the vacuum chamber switch and the second end of the branch;

- when this switch and the movable part is located so that the disconnector is in contact with the second end during part of the stroke, the intermediate position between the circuit lines and the position of the opening line, so that the movable part is located with the opportunity to take a first position in which it mechanically separated from the vacuum chamber of the switch, and a second position in which it actuates one of the contacts of the vacuum switch camera switch to create a position opening the switch contacts.

Essential features of the invention can be summarized as follows: the vacuum chamber of the switch is not located in the main supply line (in series with the circuit breaker), which switches and in parallel branch; this branch is energized, but the current flows through it only in moments of time immediately prior to the opening of the current, leaving the camera n the selector at rest during normal operation, that allows you to present a less stringent requirements to the camera switch, so that the camera switch is no longer needed so many structural elements; and the movement of the switch causes the current flowing through the branch during its operation for opening the supply lines.

BRIEF DESCRIPTION of DRAWINGS

The invention is further explained in the description of the preferred variants of the embodiment with reference to the accompanying drawings, in which:

1, 2, 3, 4, 5 and 6 schematically depict several successive States of the device during operation of open-circuit and its subsequent circuit according to the invention;

7 and 8 depict a variant embodiment of the device (the General view and side view); and

figures 9, 10, 11, 12, 13 and 14 depict several successive States of the device according to other variant embodiments of the invention.

DESCRIPTION of the PREFERRED VARIANT EMBODIMENT of the INVENTION

Figure 1 shows line 1, which is the main line of the transmission power, which is disconnector 2, and this switch is arranged to short-circuiting or disconnection when rotating around a rotary axis 3. The device also includes a parallel branch 4, which consists of a fixed part 5, which includes the vacuum chamber 6 of the switch, and vignay part 7. The stationary part 5 includes the first end 8 of the branch 4, which is connected to the line 1 power; the movable part 7 includes a second end 9 (opposite end 8) branch 4, the second end 9 in the position shown in figure 1, is located near line 1 power supply and switch 2, but separated from them. The stationary part 5 and the movable part 7 are in electrical connection with each other and pivotally connected together by the coupling 10. The movable part 7 is installed with the possibility of rotation around a fixed axis 11. The vacuum chamber 6 of the switch contains a pair of contacts 12 and 13 of the switch, of which the first contact 12 is fixed on the rod 14, which passes to the first end 8 of the branch, while the second contact 13 is located on a movable rod 15 which passes to the joint 10. Springs 16 are from a point fixed on the movable part 7, to offset part 7 in the direction indicated position, and the pressure difference causes the rod 15 holds the vacuum chamber 6 switch closed (by bringing the contact 13 of the switch in its closed position). In this state, the device in which the switch closes the line 1 power supply, current flows freely through the line, but not through the branch 4, despite the fact that the vacuum chamber 6 of the switch for the whip.

Trip line 1 power supply is controlled by turning the switch 2. Then the device is in the condition shown in figure 2, in which the disconnector is in contact with the second end 9 of the branches 4 and closes it, thereby providing a current flow in the branch 4. However, the main line 1 power remains closed, so that the transfer current in the branch 4 continues. The rotary movement of the disconnector 2 ends with the opening of line 1 power supply, as shown in figure 3. This rotary movement also causes movement of the movable part 7 branches around the turning axis 11 (this can be done, from the condition shown in figure 2). The vacuum chamber 6 of the switch remains closed, so that current then switches to the branch 4, resulting in an arc when the switch disconnects the line 1 power does not occur.

The vacuum chamber 6 of the switch opens when the distance traveled during movement of the disconnector 2, becomes so long that the movable part 7 of branch causes movement of the rod 15 for opening the contacts 12 and 13 of the switch, as shown in figure 4. Since the vacuum chamber 6 of the switch is open, the current no longer flows or in branch 4, nor in the main line 1 power supply, so the interruption of the current is full. Cherezvychaynoy chamber 6 switch short time current flows in the States, shown in figure 2 and 3, but not in a stable operating condition, shown in figure 1.

With continued pivoting movement of the disconnector 2 device reaches the state shown in figure 5, in which the disconnector out of contact with the second end 9 of the movable part 7, which is becoming so free again. Return spring 16 then returns the movable portion 7 in its initial position, and the vacuum chamber 6 of the switch closes again under the action of pressure difference. Thus, the branch 4 is driven to the same potential as the line 1 power on the side of the first end 8. Disconnector 2 is far enough away from junction 4 to prevent the occurrence of the arc. It may be in contact with the ground contact 18 to provide the ground voltage on line 1 power supply.

Repeat circuit 1 power is achieved using the rotary movement of the disconnector 2 in the opposite direction in accordance with the subsequent procedure is shown in Fig.6. The movable part 7 remains in the condition shown in figures 1 and 5, due to contact with a fixed stop 19 and by means of a spring 16, while the second end 9 is connected with the remaining part of the movable part 7 of the branch through the rotary axis 20. This rotary shaft 20 provided with a thrust element which OST is newlive its movement in the direction of the opening, together with the spring which displaces it in the direction of stop positions. Therefore, it is unidirectional: the second end 9 moves with the residual part of the movable part 7 so long as the switch is moved in the direction for opening the line 1 power supply, as shown in figure 1-5 (i.e. counterclockwise), with fixed focus, but it can be moved without moving the residual portion of the movable part 7, when the switch 2 connects line 1 power in the opposite (clockwise) direction, as shown in Fig.6. Then disconnector 2 can return to the initial position shown in figure 1, by moving only the second end 9 without moving the residual portion of the movable part 7 and therefore without affecting the vacuum chamber 6 of the switch or the occurrence of any contact between the line 1 and the branch 4, which is achieved as follows. Figure 6 shows the insulating layer 21 deposited on the second surface 23 of the second end 9, as opposed to the first surface 22, which has a conductive coating and directed to the line 1 power supply, while the disconnector 2 bonded friction way with isolated second surface 23 during the opening of line 1.

7 and 8 shows the structure of one possible variant embodiment of the invention Here you can see some of the above components, which do not require repeated description. The movable part 7 itself is not conductive. It is equipped with a cord or braid 24, which runs from rolling rod 15 to the second end 9, bypassing the rotary axis 20. The cord or braid 24 is flexible and conductive. The insulating layer 21 may be made in the form of a single element, sandwiched around the second end 9 and covers on the sides of the bending portion 7. In addition to that provided by the connecting link 25, pivotally connected with the movable part 7 and the rolling of the rolling rod 15, so that the movable part 7 can move the rod 15, while the connecting link 25 as in the initial position shown in figure 1 and in the position shown in Fig, separated from the flange 37 on the end of the rod 15 by a gap, which delays the transition from the state shown in figure 2, to the state shown in figure 4. Movement of the rod 15 starts after the removal of the gap by means of a connecting link 25, resting on the flange 37.

Below is a description of the second variant embodiment with reference to figures 9 to 14, which shows some of the stages. Shown here, the circuit breaker differs from that described above so that the movable part (denoted by position 27) branches (which is indicated by the position 26) is located with the possibility of sliding movement, and turning parts, all specifications is its movement, however, other elements of the circuit breaker remain unchanged and are denoted by the same positions. In accordance with this branch 27 has a slider 28, parallel to the axis of the vacuum chamber 6 of the switch, while the slider is designed for linear motion in a stationary guide 29 slip. The second end 9 of the branch 26 is again shown near the disconnector 2 in the initial position, this end is covered with a conductive layer on its first surface 22 facing the switch, and has an insulator on its opposite surface 23. The second end 9 is connected to the slider 28 using the rotary axis 20.

Shown in Fig.9 state line 1 power closed by a switch 2. The vacuum chamber 6 of the switch is closed, it contacts 12 and 13 are connected together, but no current flows through the branch 26.

The state shown in figure 10, corresponds to figure 2: the disconnector is in contact with the second end 9 without leaving contact with the bus 30 lines 1 power supply. The current flows through the branch 26. Vacuum switching chamber 6 remains closed through the device to delay the opening, such as described above, the device having a rotatable connecting link 25 (which is not depicted here).

The state shown in 11, corresponds to the state shown is as figure 3: the disconnector 2 is no longer in contact with the bus 30 and holds the line current 1 supply branch 26, although it remains in contact with the second end 9, which he pushes so that the movable part 27 slides in the guide 29 of the slip. The contacts 12 and 13 are separated, which also disconnects the branch 26. The vacuum chamber 6 of the switch extinguishes the arc.

On Fig shows the state in which the second end 9 of the disconnector behind that ensures the return of the movable part 27 and re-closure of the vacuum chamber of the switch. This is achieved using the pressure difference acting as a return spring.

On Fig shown that the same as figure 5, the switch 2 may be located on the ground terminal 18, while the lower part of line 1 is set in this case, the ground potential, while all the branch 26 is at the same voltage, the upper line 1 power supply, since the vacuum chamber 6 of the switch is closed.

Fig is similar to 6 and showing the circuit breaker: the disconnector 2 passes by the second end 9 due to its rotation around the rotary axis 20. As it glides over the surface 23 having an insulating cover, the switch does not create the path of current flow through the branch 26 from line 1 power supply, but again closes the line 1 in contact with the bus 30. This results again in the state shown in Fig.9. The second end 9 of the liberation what is and returns to its initial equilibrium position.

1. The circuit breaker current supply line or power cable, comprising a vacuum chamber (6) switch having two contacts (12, 13) switch located so that they can move relative to each other and are able to take a closed position and open position, characterized in that it contains:
the movable switch (2)connected to a power line and performed during the motion to accept the position of the circuit line and the position of the opening line; and
the branch (4)which is connected to the power line with a first end (8) branches, while the vacuum chamber of the switch are connected in that branch, and the branch contains a movable part (7)located between the vacuum chamber switch and the second end (9) branch, opposite the first end;
this disconnector (2) and the movable part is located so that the disconnector is in contact with the second end (9) during part of the stroke, the intermediate position between the circuit lines and the position of the opening line, so that the movable part is located with the opportunity of being in the first state, in which it is released from the vacuum chamber of the switch, and in the second state, in which it actuates one of the contacts (13) of the switch of the vacuum chamber of the switch POPs the project for a position opening the switch contacts.

2. The circuit breaker according to claim 1, characterized in that it includes a return spring (16) to return the movable parts in the position in which the second end (9) is located near the line (1) power supply.

3. The circuit breaker according to any one of claim 1 or 2, characterized in that the second end is electrically conductive first surface (22), which is converted to a line (1) power supply, and the second insulating surface, and the disconnector (2) has the ability to move in opposite directions.

4. The circuit breaker according to claim 1, characterized in that the second end is connected with another part of the movable part with a rotary axis (20) to move in one direction, the rotary shaft has an end stop and a return spring and is arranged to move and return when the disconnector (2) is moved during the course of the provision of open supply lines to the position closing the supply line.

5. The circuit breaker according to claim 1, characterized in that the separator (2) is rotatable.

6. The circuit breaker according to claim 1, characterized in that thethe movable part (7) is rotatable.

7. The circuit breaker according to claim 1, characterized in that the rotary part is made with the possibility of sliding movement.