JPH0250574B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a puffer type gas shield disconnector, and in particular, it is equipped with a shield resistor and a closing resistor, and is capable of suppressing shield surges and closing when the shield is disconnected. The present invention relates to a puffer-based gas insulator and disconnector configured to reduce input surges during operation.

[Prior art]

In a power supply type gas shield disconnector, in order to suppress the power-on surge that occurs when an unloaded power transmission line is turned on by the shield or disconnector, the main contactor is installed in parallel with the main contactor device prior to the power-on of the main contactor. In Japan, the introduction of a closed-in resistor device has been put into practical use in 500kV systems. On the other hand, in a 1100kV class system, in addition to the input surge, a circuit is installed in parallel with the main contactor device, which handles the output surge at the time of output surge and the output surge at the time of output. Plans are underway to reduce insulation levels and economically design power transmission lines and transmission and substation equipment using disconnect resistance devices. Analytical examples have shown that it is preferable for the value of the closing resistance to be approximately 500Ω or less, and for the breaking resistance to be approximately 1000Ω or less from the standpoint of surge suppression.

Figure 1 is an electrical circuit diagram of a puffer-type gas shield disconnector equipped with such a disconnection resistance device and closing resistance device, and Figures 2 and 3 are time charts of its disconnection and closing operations. be.

In Fig. 1, one shear break point of the shingle break section is shown, and the shear break resistance device is electrically connected in parallel with the main contact 1 and consists of a shear break resistance 2 and a shear break resistance contact 3. and a closing resistor device consisting of a closing resistor 4 and a closing resistor contact 5 are connected to each other.

During _the shearing operation, as shown in _FIG . The closed state is maintained until the maximum time T _nax or more of the time from when the main contact 1 opens at time t ₂ until the arc disappears, that is, (T _nax + α) time has elapsed. 2 is inserted into the circuit, and the terminal is opened for the first time at time t ₃ when the above-mentioned (T _nax +α) time has elapsed, and the resistance current is interrupted.

In addition, during the closing operation, as shown in FIG. 3, the closing resistor contact ₅
is turned on at time _t4 , and the break resistance contact ₃ is turned on at time _t6 after the main contact 1 is turned on at time t3.

By the way, when these shield breaking resistance devices and closing resistance devices are applied to a puffer type gas shield disconnector having a structure as shown in FIG. 4, the following problems arise.

The puffer type gas shield disconnector moves the insulating operation rod 6 downward by an operating device (not shown) in response to a disconnection command, and links 7, lever 8, and link 9.
to drive the puffer cylinder 10 to the right.
As a result, the movable main contact 12, which is integrally formed with the puffer cylinder 10, separates from the fixed main contact 11, and an arc is generated. This arc causes the gas pressure (hereinafter referred to as puffer pressure) P in the puffer chamber 14, which is composed of the puffer cylinder 10 and the fixed piston 13, to rise in accordance with the stroke S _M of the puffer cylinder 10, as shown in FIG. The arc is extinguished by spraying the arc extinguishing gas in the arc through the insulating nozzle 15.

In the above-mentioned patchwork type gas shield disconnector, the second
Since the time (T _nax +α) shown in the figure takes almost to the end of the stroke of the shear breakage operation, if a shear break resistance device is added to this, the start of operation of the shear break resistance contact 3 will be as shown in Figure 5. Shrink resistance contact 3 shown in
It must be at the point when the puffer type main contactor 1 has almost completed its operation, as shown in the stroke S _R of . This means that the main contact 1 and the shear resistance contact 3 can be connected in the same operating device.
making it extremely difficult to drive. For this reason, it is conceivable to add a new operating device only for driving the shingle breaker contact, but this is not preferred because it poses problems in terms of reliability, miniaturization, and economic efficiency of the shingle breaker.

As a solution to this problem, systems shown in FIGS. 6 to 8 have been proposed. FIG. 6 shows the closing state, FIG. 7 shows the state in which the cutting resistance contact is in the middle of breaking operation, and FIG. 8 shows the state in the making operation.

In these figures, a puffer-shaped main contact 1
includes a shear break resistance 2 and a fixed shear break resistance contact 1.
6. Sheet breaking resistance contacts 3 consisting of movable sheath breaking resistance contacts 17 are provided in parallel. A puffer cylinder 18 is integrally formed with the movable sheath breaking resistance contact 17, and a drive rod 19 is directly connected to the drive rod 19.
1 is integrally formed, and a roller 22 is provided. 23 is a fixed piston, 24 is a puffer chamber, and 25 is an insulating nozzle. Reference numeral 26 denotes a substantially T-shaped lever, which is biased to rotate counterclockwise by a tension spring 27 provided at one end.
The other end has an engagement step 28 that engages the roller 22.
is formed, and a roller 29 is provided at the other end. 30 is a spring case, and a spring seat 21 formed on the drive rod 19 is slidably inserted into the case 30. A compression spring 31 is interposed between the case 30 and the spring seat 21. is now moving to the right. Further, a substantially triangular tear resistance contact lever 33 is mechanically connected to the link 7 via a link 32, and this lever 33 is engaged with the engagement protrusion 20 and is connected to the drive rod 1.
9 to the left, and the roller 2
A circular arc portion 35 and a straight portion 36 that engage with the portion 9 are respectively formed.

When performing the shedding operation from the closed state shown in FIG. 6, by moving the insulating operating rod 6 downward, the movable main contact 12 mechanically connected to it via a link mechanism moves to the right. When driven, the main contact 1 performs a cutting operation. At this time, the shrivel resistance contact lever 33 is rotated clockwise, but since the roller 29 is initially on the circular arc portion 35, the lever 26 is not rotated, and its engagement stepped portion 28
remains engaged with roller 22. Therefore, rightward movement of the drive rod 19 is prevented, the shear resistance contact 3 remains closed, and the shear resistance 2 remains inserted in parallel with the main contact 1. When the lever 33 is further rotated clockwise and its straight portion 36 reaches the roller 29 (at this time, the main contact 1 is just before the completion of the cutting operation), the roller 29 is moved by the straight portion 36. When pressed, the lever 26 is rotated clockwise against the force of the tension spring 27, so that the roller 22 and the engagement step 2
8 will be disengaged. Therefore, as shown in FIG. 7, the drive rod 19 is moved to the right by the force of the compression spring 31, and the movable shearing resistance contact 17 and the puffer cylinder 18 are driven to the right to reduce the shearing resistance. As the contact 3 performs the breaking operation, the resistance current arc generated in the breaking resistance contact 3 is extinguished by the arc-extinguishing gas blown out from the puffer chamber 24 through the insulating nozzle 25.

Also, during the closing operation, as shown in Figure 8,
By moving the insulation operating rod 6 upward,
The movable main contactor 12 is moved to the left and the main contactor 1
At this time, the breaking resistance contact lever 33 is rotated counterclockwise, and its pressing portion 34 engages with the engagement protrusion 20 of the drive rod 19 to compress the drive rod 19. It moves to the left against the force of the spring 31. Therefore, the compression spring 31 is loaded via the spring seat 21, the tear resistance contact 3 is closed, and the engagement step 28 of the lever 26 engages with the roller 22, causing the lever 26 to move forward. The state shown in FIG. 6 is reached, and the closing operation is completed.

Although this system is satisfactory in terms of operation and structure as a puffer-type gas sheath breaker equipped with a shear breaker, new problems arise when a closing resistor is further added.

In other words, when adding a closing resistance device to the above-mentioned method, as shown in FIG. It is generally considered to adopt

FIG. 9 shows the charging state. The main contactor 1 is provided with a closing resistor 4, a closing resistance contact 5 consisting of a fixed closing resistance contact 37, and a movable closing resistance contact 38 in parallel, in addition to the shearing resistance device. A drive rod 39 is directly connected to the movable closing resistance contact 38, and an engagement protrusion 40 and a spring seat 41 are integrally formed on the drive rod 39. Reference numeral 42 denotes a substantially V-shaped closing resistance contact lever, which is mechanically connected to the link 7 via a link 43 and has a pressing portion 44 that engages with the engagement protrusion 40 . 45 is a spring case, into which a spring seat 41 formed on the drive rod 39 is slidably inserted;
A compression spring 46 is interposed between the spring seat 41 and the spring seat 41 to move the drive rod 39 to the right. 47 is a shield.

When performing the sheath breaking operation from the closed state shown in Fig. 9, by moving the insulation operation rod 6 downward, the shear breaking operation of the main contact 1 and the sheath breaking resistance contact 3 is performed using the method according to the above proposal. The process is carried out in the same manner, but as the insulating operation rod 6 moves downward, the closing resistance contact lever 42 is rotated clockwise via the links 7 and 43, and the pressing portion 44 and the drive rod 39 are engaged with each other. Since the protrusion 40 is disengaged, the movable closing resistance contact 38 is driven to the right together with the drive rod 39 by the force of the compression spring 46, and the closing resistance contact 5 is opened and closed. Furthermore, during the closing operation, by moving the insulating operation rod 6 upward, the closing operation of the main contact 1 and the shear break resistance contact 3 is performed in the same manner as in the method according to the above proposal, but in addition, the insulating operation rod 6 is moved upward. As it moves upward, the closing resistance contact lever 42 is rotated counterclockwise, and its pressing portion 44 engages with the engagement protrusion 40 to move the drive rod 39 to the left against the force of the compression spring 46. move towards Therefore, the compression spring 46 is loaded with energy through the spring seat 41, and the closing resistance contact 5 is closed, resulting in the state shown in FIG. 9, and the closing operation is completed. Note that shifting the operating timings of the main contactor 1 and the closing resistance contact 5, as shown in FIGS. 2 and 3, can be easily achieved by, for example, adopting a wire structure as the contact structure of these contacts. be able to.

The system shown in FIG. 9 is satisfactory in terms of operation as a puffer type gas sheath breaker equipped with a sheath breaking resistance device and a closing resistance device. However, in the case where the levers 33 and 42 that drive the shear break resistance contact 3 and the make resistance contact 5 are mechanically connected to the main contact drive lever 8, the operation is ensured and reliability is ensured. Main contact 1 and contact 3,
5 is placed on a plane parallel to the operating plane of the insulated operating rod 6, and the link mechanisms of the contacts 3 and 5 are arranged at corresponding positions above and below the link mechanism of the main contact 1. The usual way of thinking is to consider it as a structure. On the other hand, in a patchwork type gas shield disconnector, as shown in Fig. 10, a grounded tank 4
A cylindrical portion 49 is formed in the cylindrical portion 4.
The movable part of the main contactor 1 is supported by the other end of the insulating tube 50, one end of which is fixed by the insulating tube 9, and this movable part is mechanically connected to the operating device 51 via the link mechanism and the insulated operating rod 6. connected. In addition, 52 is an inspection window, 53 is a shield, and 1', 3', and 5' are other main contacts corresponding to the above-mentioned main contact 1 and each contact 3, 5 in the case where there are multiple branches or breaks. and each contact point is shown respectively.
Therefore, when arranging the link mechanisms of the main contact 1 and each contact 3, 5 as described above, the main contact 1 (1, 1') and each contact 3 (3, 3'),
5 (5, 5') is arranged as shown in the figure.

As mentioned above, in the method shown in Figure 9, the disconnection resistance device and the closing resistance device are placed at corresponding positions above and below the main contactor device, respectively, so the installation space for these devices is large, and this requires a large amount of space. Accordingly, the shield 53 also becomes larger, and the ground tank 48 also becomes larger. In addition, since a link mechanism and a compression spring device are provided to drive the shear breaking resistance device and the closing resistance device, the structure is not only complicated, but also the closing resistance device is behind the shear breaking resistance device. Since it is located far from the inspection window 52 and its structure is complicated, it is difficult to inspect and adjust it from the inspection window 52.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art as described above, and to provide a puffer type gas insulator and disconnector which has a simple structure, can be made compact, and has excellent reliability.

[Summary of the invention]

In order to achieve this object, the present invention makes it possible to drive a movable shear break resistance contact by a link mechanism for a shear break resistance contact that is mechanically connected to a link mechanism for a main contact, and also makes it possible to drive a movable break resistance contact. is arranged on a plane parallel to the operating plane of the insulated operating rod, and the movable closing resistance contact is mechanically connected directly to the movable main contact without a link mechanism.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 11 to 13. Figure 11 is the input state, Figure 12
The diagram shows the state of the breaker contact during the breaker operation, 1st
Figure 3 shows the states during the closing operation. In these figures, the same reference numerals as in FIGS. 6 to 9 indicate the same or equivalent parts.

The difference between this embodiment and the method shown in FIG.
The drive mechanism parts 39 to 46 for driving the movable closing resistance contact 38 in the figure are omitted, and instead, the movable closing resistance contact 38 is directly connected to the puffer cylinder 10 of the main contact 1 by the connecting portion 54. The other structure is the same as that shown in FIG.

Therefore, the closing and closing operations of the main contact 1 and the closing resistance contact 3 are the same as in the case of FIG. 9 described above, but the closing and closing operations of the closing resistance contact 5 are It will look like this: That is, since the movable closing resistance contact 38 is directly connected to the puffer cylinder 10 of the main contact 1, that is, the movable main contact 12, the main contact 1
In connection with the closing operation, the movable closing resistance contact 38 moves to the right and opens from the fixed closing resistance contact 37, thereby performing the closing operation of the closing resistance contact 5. Also, during the closing operation, the main contact In connection with the closing operation of the child 1, the movable closing resistance contact 38 moves to the left and comes into contact with the fixed closing resistance contact 37, so that the closing operation of the closing resistance contact 5 is performed. Note that shifting the operating timings of the main contactor 1 and the closing resistance contact 5, as shown in FIGS. 2 and 3, can be easily achieved by, for example, adopting a wire structure as the contact structure of these contacts. be able to.

According to this embodiment, the movable closing resistance contact 38 is simply directly connected to the puffer cylinder 10 of the main contact 1 to drive it, so that a link mechanism and a compression spring device for driving the movable closing resistance contact 38 are used. etc. are not required, the structure becomes simple, the closing operation force is small, and the closing resistance contact 5 (5, 5') can be installed at the main contact 1 (1, 1'). It can be selected at any position within the range shown by hatching in FIG. 14, rather than at the position corresponding to the vertical bending resistance contact 3 (3, 3') centered at . Therefore, there are fewer restrictions on the installation of the making resistance contact 5 (5, 5'), and for example, the making resistance contact 5 (5, 5') can be
As shown in FIG.
(3, 3'), the shield 53a can be made smaller than the conventional shield 53 shown by the dashed line, and along with this, the ground tank 48a
It can also be made smaller. Furthermore, if the closing resistance contact 5 (, 5, 5') is arranged in this way, the closing resistance contact will be close to the inspection window 52, and its structure will also be similar to the main contact 1 (1, 1') as described above. )
Since it is a simple one close to the main contact 1
(1, 1'), not only the breaking resistance contact 3 (3, 3') but also the closing resistance contact 5 (5, 5') through the inspection window 5.
It becomes possible to easily inspect from 2.

〔Effect of the invention〕

As explained above, according to the present invention, the link mechanism for the shear break resistance contact for driving the movable shear break resistance contact is mechanically connected to the link mechanism for the main contact, and these link mechanisms is placed on a plane parallel to the operating plane of the insulated operating rod, and the movable closing resistance contact is mechanically directly connected to the movable main contact, ensuring reliable operation and improving reliability. Since a link mechanism, a compression spring device, etc. for driving the closing resistor are not required, the structure can be simplified. In addition, the structure of the closing resistor device becomes simpler, and there are fewer restrictions on its placement, increasing its degree of freedom.By placing it in any position, the installation space of the sheath section can be reduced. As a result, the entire shear breaker can be downsized.

[Brief explanation of drawings]

Figure 1 is an electric circuit diagram of a puffer type gas shield disconnector equipped with a shield breaking resistance device and a closing resistance device; Figures 2 and 3 are time charts of its shield breaking and closing operations; The figure is a longitudinal side view of a puffer-type gas shield breaker, Figure 5 is a characteristic diagram showing the relationship between the puffer pressure and the stroke of the puffer cylinder and shield resistance contact of the puffer-type gas shield breaker, and Figures 6 to 6 are Figure 8 is a vertical cross-sectional side view showing the closing state, the state in the process of cutting the shield, and the state in the closing operation of a puffer-type gas shield disconnector equipped with a shield breaking resistance device, and Figures 9 and 10 are FIGS. 11 to 13 are longitudinal sectional side views and vertical sectional front views showing the expected structure of a puffer-type gas sheath breaker equipped with a sheath resistance device and a closing resistance device, according to an embodiment of the present invention. Figures 14 and 15 are longitudinal cross-sectional side views showing the closed, closed, and closed states of the puffer-type gas shield and breaker, respectively. It is a front view. 1... Main contact, 2... Folding resistance, 3... Folding resistance contact, 4... Closing resistance, 5... Closing resistance contact, 6... Insulated operation rod, 7... Link, 8
...Lever for main contact, 9...Link, 10...
Puff cylinder, 12...Movable main contact, 13
...Fixed piston, 17... Movable shear breaking resistance contact, 32... Link, 33... Lever for shear breaking resistance contact, 38... Movable closing resistance contact, 54... Connection portion.

Claims (1)

[Claims] 1. A pair of movable main contacts and fixed main contacts that can be connected to and separated from each other during closing and cutting operations, in a grounded tank filled with arc-extinguishing gas and sealed, and A main contact device comprising a gas blowing means for compressing and blowing an arc-extinguishing gas between the movable main contact and the fixed main contact by movement of the movable main contact in the cross-section direction; , a pair of movable shingle-breaking resistance contacts and a fixed shingle-breaking resistance contact, which are provided electrically in parallel with this main contactor device and can open after the opening of the main contactor device; A shear breaking resistance device consisting of a resistor, a pair of movable closing resistance contacts and a fixed closing resistance that are electrically connected in parallel with the main contact device and can be connected and separated to close the circuit prior to opening of the main contact device. A closing resistance device consisting of a contact and a closing resistor is housed, and the movable main contact is connected to an insulated operating rod,
In a puffer-type gas shield breaker equipped with an operating device that is operated via a main contact link mechanism that mechanically connects the insulated operating rod and the movable main contact, the above main contact link mechanism is provided. The movable shingle break resistance contact link mechanism mechanically connected to the shingle break resistance contact allows the movable shingle break resistance contact to be driven, and the main contact link mechanism and the shingle break resistance contact link mechanism are operated in the insulation operation. A puffer-type gas shield and disconnector, characterized in that the movable closing resistance contact is arranged on a plane parallel to the operating plane of the rod, and the movable closing resistance contact is mechanically directly connected to the movable main contact. 2. In claim 1, the movable closing resistance contact and the fixed closing resistance contact are located below the movable and fixed closing resistance contacts, and the movable main contact and the fixed main contact are located below the movable and fixed closing resistance contacts. Placed in a position close to the movable main contact and the fixed main contact above the position corresponding to the movable shingle breaking resistance contact and the fixed shingle breaking resistance contact position in the vertical direction with the contact as the center position. Patshua-shaped gas disconnector featuring