JPS5960922A - Auxiliary switch for switching device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an auxiliary switch of a switching device, and more particularly to a connection structure between an operating device of the switching device and a stroke device of the auxiliary switch.

[Technical background of the invention and its problems]

The switchgear is provided with an auxiliary switch that detects the opening/closing operation of the switchgear and provides a control signal to its control circuit. Generally, this auxiliary switch mechanically captures the operation of the operating mechanism of the switching device and operates the auxiliary switch in accordance with the operation of the operating mechanism.

An example of a conventional auxiliary switch will be explained based on FIGS. 1 and 2. FIG. 1 shows the switchgear in the closed state, and FIG. 2 shows the switchgear in the cutoff state. The opening/closing command is then given to the control mechanism 1, which charges and exhausts the inside of the cylinder 2 and applies a driving force to the piston 3.

This screwton 3 is connected to the rod 5 via the insulating operation port and the door 4.
The movable electrode 5a provided at the tip of the rod 5 and the fixed type 4If6 are in the closed state (the state shown in FIG. 1) and in the open state (the state shown in FIG. 2). Obtained by the movement of pisetone 3. The auxiliary switch 7 is connected to the drive shaft 3 & of the piston 3 via a wire 8. With the movement of the piston 3, the rotation 1llI9 of the auxiliary switch 7 is changed to 1i-i, l by 9-8.
The contact tip 10 installed on the front rotating shaft 9 is rotated, thereby causing the contact tip 10 installed on the front rotating shaft 9 to touch the contact 1 of the auxiliary switch 7.
By short-circuiting between 1a and llb as shown in FIG. 1 and opening as shown in FIG. In response to this, the circuit is closed and opened almost simultaneously.

Although the auxiliary switch 7 shown in FIGS. 1 and 2 has been described using an example of an a contact, it is also possible to configure a b contact by changing the installation position of the contact chip 10.

Next, the case where this auxiliary switch is applied to a gas breaker type will be described using FIG. In addition, the first
Components that are the same as those in the figure and FIG. 2 are given the same reference numerals.

In general, a Yaffer type gas breaker has a fixed electrode 6 fixed in a gas atmosphere and a movable electrode 5B, as shown in FIG.
It consists of 'FiJ' t, 'j13 part 13 with f. The movable part 13 includes an absolute α nozzle 15 in which a circular i+T1 path 14 is entirely formed around the movable electrode 5a, a cylinder 16 to which the movable electrode 5a, the pole 5a, and the insulating nozzle 15 are integrally fixed. Protruding inside 16,
It consists of a rod 5 that reciprocates the movable electrode 5a together with the cylinder 16, and an annular piston 18 is inserted into an annular compression chamber 17 formed by the cylinder 16 and the rod 5. This piston 18 is fixed, and by moving the movable part 13 in the axial direction with respect to this piston 18, gas is sucked into the compression skewer 17 through the passage 14 and the opening 19 at the time of closing. When the electrode is closed, gas is sucked into the compression chamber 17, and when the electrode is opened, the gas in the compression chamber 17 is compressed and blown out through the opening 19 and the passage 14 to the sheath, and is generated between the electrodes. Extinguish the arc.

The arc extinguishing performance of such a Yaffa type gas breaker is determined by the pressure rise characteristics of the compressed gas within the gas compression chamber 17.

On the other hand, the gas in the compression chamber 17 expands because the body 1;
As il+1/external pressure decreases. At this time, if sufficient time is allowed until the next shutoff operation, the gas in the passage 14 will be absorbed into the interior 17, so that the pressure in the compression chamber 17 will become equal to the gas LF in the outside H4B.

By the way, in Figure 4, the control circuit for the
1.) is also a basic part! Ha)! , is a conceptual diagram.

1h, 20 in figure 1 is the input signal, input terminal 2 is the cutoff (g
The tan input terminal 22 is connected to the negative potential side flf control power supply I block, 23
it , +<r input coil 241 is a cutoff coil.

Now, when the closing signal No. 1 is applied to the aforementioned closing signal input terminal 2o, the official coil 23 is energized, and its attraction force attracts the armature on the closing side of the breaker, although it is not shown in the diagram. Then, the operation mechanism section is operated and the breaker performs the closing operation. Further, upon detecting the operation of the sweeping mechanism, the a contact 7a of the auxiliary switch is closed. Next, when a cutoff signal is applied to the cutoff signal input terminal 21, the cutoff coil 24 is energized, the cutter performs a cutoff operation, and the a contact 7a of the auxiliary switch starts.

Here, when the interrupter performs the cutoff operation at the time of input tkj + operation and termination, the state of each part at the time of operation of Tsume 9CO is
As shown in the figure. 1. An input signal is given at time a,
At the time, the sweeping mechanism of the circuit breaker is turned on (QC)+
When the operation starts, the pressure inside the through-compression chamber described in FIG. 3 becomes lower than the external gas pressure. As a result of the closing operation of the side part of the operating machine, at time c, the electric current (pero) and the fixed electrode 5a are in the closing state, the breaker is closed, the a contact of the Kamisuke switch is also closed, and the compression chamber is closed. The pressure gradually increases with the passage of time and approaches the pressure outside the pressure 411 chamber.However, when a shutoff signal is given after the breaker has performed the closing operation, the operating mechanism of recent high-performance circuit breakers Since the unit is capable of responding at high speed, the operation mechanism unit starts the shutoff operation at time d, and opens without the pressure in the compression chamber being sufficiently recovered (the continuous operation progresses. As a result, The gas inside the compression chamber starts to be compressed at a pressure lower than the gas pressure outside the compression chamber, and the pressure change process 3 is lower than the normal pressure change process 29 shown in FIG.
0, making it impossible to obtain sufficient gas pressure at the time of shutoff. As a result, there was a risk that the arc extinguishing ability would be reduced and a serious accident could occur due to failure of breaker.

Therefore, in the past, in order to reduce this risk, a part of the fluid driving the operating mechanism of the breaker was taken out and this was
A method is used in which the A contact of the auxiliary switch is closed using the D extension. By doing so, the a contact of the auxiliary switch will not close until the pressure in the compression chamber is sufficiently restored, and therefore the cutoff coil 24 will not be energized. By using this method, it is possible to reduce the risk of accidents due to failure of the breaker. However, since this method does not directly detect the movement of the breaker 7 or the breaker (jτ structure), it is possible that a malfunction may occur and the a contact of the auxiliary switch may close regardless of the breaker's closing operation. However, since the delay is performed by fluid control, it has the disadvantage that it is not possible to obtain a certain delay time (r-) due to the physical properties of the flow (ill) over a wide temperature range.

[Purpose of the invention]

In view of the above-mentioned points, the present invention has been developed to operate the switchgear (by directly mechanically detecting the movement of the tangent part and to detect the Q
It is an object of the present invention to provide an auxiliary switch for a switchgear that closes a circuit with a fixed delay time of i. An example will be described. Note that parts that are the same as those in Figures 1 to 3 are given the same numerals.

In FIG. 6, this lever 32 rotates counterclockwise in FIG. 6 with respect to one end 32b of a lever 32 having a rotation shaft, 92 a f, with one end 38 fixed as a tensioning member. It applies tensile force as if

Therefore, the connecting lever 33 connected to the lever 32 at the movable rotating shaft 93a is
Always move upward in FIG. 6 with respect to the connecting end 34a of the auxiliary switch drive lever 34, which has the fixed rotating shaft 9 pressed to the connecting lever 33 via the movable rotating shaft 33b'f installed at the other end. This creates a problem with the neutral axis being at position 11 in Figure 6. -・Drive piston lll1l+, ? A flange 3b for connecting the structural part to L7 and ribs is housed in a, and it comes into contact with this flange 3b near the end of the opening and closing operations of the opening/closing device. First and second contact bins 35 and 36 are installed on the fixed plate 37 and pass through the openings ITX1 to 38 and 39. Stops 42 and 43 are provided to stop the upward movement of the first and second contact bottles in FIG. Also, this fixed plate 37)
Concave cases 44 and 45 are provided to prevent the Z-neck from falling off.

When the opening/closing device performs the closing operation, the drive shaft 3a of the piston 3 moves to the left in FIG. The flange 3b provided on the drive shaft 3a of this piston is brought into contact with the fixed electrode to turn the opening/closing device into a closed state.
m and push this first contact bottle ss@@6 figure downward. As a result, the leg portion 35b of the first contact bottle 35 pushes the arm 46 installed on the auxiliary switch drive lever 34 downward in FIG. The connection end 94A of the catch switch drive lever 34 rotates counterclockwise, and the fixed rotation q(1
9 to the right side of 11 lower 1i in Figure 6
fL, %+. This state +F, i1 is shown in FIG.

For this reason, the force F of the spring 71 applied to the rili aid 1'M closing device and the drive lever 34 via the connection lever 33
As a result, the auxiliary switch drive lever 34 further rotates in the counterclockwise direction in FIGS. 6 and 7. This rotational movement of the auxiliary switch drive lever 34 causes the piston's! IKft!
The second arc 47 installed in the IJ lever 34 is connected to the leg 36 of the contact bin 36 of N4J2.
The second contact bottle, 96, is in contact with FIGS. 6 and 7.
Fig. 7 is pushed in three directions (7) and is burned into the AA contact bottle 36.
The installed stop/943 contacts the fixed plate 37 and the second
1ii11 of the bin 36 is stopped by K being obstructed.

After that, the auxiliary switch drive lever 34 is moved by the spring 31.
This state is maintained by the power of This situation7. i,
! i is shown in FIG. Therefore, the contact tip 10 is installed on the fixed rotating shaft of the auxiliary opening/closing left circular four-motion lever 34, and the auxiliary switch drive lever 34 is rotated by the driving force of the spring 31 after the piston drive shaft 3a completes its movement. By providing the terminal 12 as a female i contact having contacts 11a and llb that are pressed cheek-to-cheek by the contact tip 1o due to the movement, the time between the terminals of the female i contact 12 is shorter than the closing operation of the switch. It is possible to construct an auxiliary switch that is extended and closed automatically.

On the other hand, when the switchgear performs a shutoff operation, the piston 3
The drive shaft 3a moves to the right in FIG. 8, and although not shown in FIG. 8, the oJ moving small rod installed on the left side of the drive shaft 3a and the fixed electrode are opened to open the switchgear. The drive of this piston 3 is +1i1J, 11113 m.
(7) Push the second contact bottle 36 downward in FIG. In this case, the catch switch drive lever 340''J rotates once around the clock in Fig. 8,
The contact M of the auxiliary switch is opened between terminals 11m and 11b°. Further, the auxiliary switch drive lever 34 is connected to one of the pistons 3.
The drive shaft 3a is driven by the Franz 3b from the neutral position shown in FIG. 6 to a position rotated clockwise in FIG. Therefore, the drive Q'ltl 3 of the piston 3
Even after A has completed the 11th operation, the auxiliary switch drive lever 34 and 3 springs are not activated! The force continues the rotation in the clockwise direction in FIG.
The stock holder 42 installed in the contact bin 35 is attached to the fixing plate 3.
7 and the movement of the first contact bottle 35 is prevented and stopped.

Thereafter, the auxiliary button closing drive lever 34 is held in this state by the force applied by the spring 3, and stands by in preparation for the other closing operation of the opening/closing device. This state is shown in Figure 9.

Here, the first and second contact bins 35 (and 36) t, i-th in FIGS. 6 to 9.

It is configured as shown in the figure. i.e. first and head ft
1l 3511 (and 36m)/4' 42
(and 43) and the decoy J portion 35b (and 36b), and by connecting them through the threaded portion 48, the bottle 35 (and 76)
The length of is variable. By doing this, the position where the flange 3b of the piston drive shaft 3a contacts the contact bottle (and 36) and the auxiliary switch SRli! When the + lever 34 is driven by the flange 3bK, the ratio of the time during which it is driven by the force F of the spring 3 can be varied.

The fixed end 31 of the spring 31 in FIGS. 6 to 9
In contrast to a, 11 is firmly fixed to the fixed wall 5θ with bolts 49 as shown in Fig. The spring 31 is fixed by attaching a nut 54 to the cylindrical spring case 5.9, and providing a cap mechanism for fixing the nut 54 with a bottle 55 for identifying the spring fixation member 71a.
The initial tension of can be changed. By doing so, the rotation speed at which the auxiliary switch drive lever 34 rotates by the force F of the spring 31 in FIGS. 6 to 9 can be changed.

By providing the above-mentioned mechanism illustrated in FIGS. 10 and 11, the time from when the switching device completes the closing operation to when the terminals 12 of the auxiliary switch 7 are closed is variable and adjustable. It becomes possible. Similarly, the time from when the switchgear completes the cutoff operation to when the terminals 12 of the auxiliary switch 7 are opened can also be monitored and adjusted.

Note that the present invention is not limited to the above embodiment,
It may be configured as shown in FIGS. 12 and 13. The same parts as in FIGS. 6 to 11 are given the same reference numerals.

In FIG. 12, the auxiliary switch drive lever 34 and the bins 35 and 36 are connected via levers 56 and 57. With this structure, the rotation angle of the auxiliary switch drive lever 340 can be set to a very large value using the button. As a result, it becomes possible to set a large distance between the contacts 11a and llb of the terminal 12 of the auxiliary switch, which improves the insulation reliability when the auxiliary switch is opened. Of course, it becomes easier to control the rotation angle of the switch drive, that is, adjust the time.

In FIG. 13, reference numeral 58 denotes a normal push-button switch, and a projection 94 is provided on the auxiliary switch drive lever 34 when the auxiliary switch 1 (4-switch lever 1) rotates 340 degrees.
Is b the pusher? Press button switch 58 yN button 5B
Terminal 58 of the push button switch by pressing m
A circuit between b is closed. It goes without saying that the same effect can be obtained even if a mechanism in which the jjiA dynamic lever is integrated into the main body is used instead of the rotating shaft 9 of the auxiliary switch drive lever 34 for opening and closing the contacts.

In this way, in the present invention, since the contacts are configured to be opened and closed via the panel, it is possible to always provide a certain delay time when the contacts are opened and closed. It's a trench.
It is also easy to increase or decrease the total delay time. at the same time,
Because the shape of the solid parts is simple, it has excellent workability, and because it has the ability to adjust the actual position of the flange and bottle, it has the advantage that strict 4H degrees are not required during carini and assembly. In addition, since the collision between the flange portion and the bottle is transmitted via the spring, it also has the advantage of alleviating the impact caused by a cylinder collision. By using the contact according to the present invention as an auxiliary switch of a switching device and configuring a control circuit such that this contact is placed in series with a breaker coil, a breaker command is not issued until a predetermined time elapses after the breaker is turned on. thwarted. Therefore, it is possible to prevent the pressure in the compression chamber of the breaker from being sufficiently restored and the interruption operation to be performed.
This has the effect of significantly improving the reliability of the circuit breaker. In addition, during a cutoff operation, it is possible to extend the duration of the cutoff command, allowing sufficient time for the operation of the cutoff status display relay, etc., and preventing malfunctions in the sequence. becomes.

〔Effect of the invention〕

As described above, if the auxiliary switch according to the present invention is applied to a large-capacity, single-pressure gas circuit breaker, it is possible to guarantee the breaking performance during high-speed circuit closing, so there is no change in performance due to ambient temperature, and the power system Stable operation becomes possible.

[Brief explanation of drawings]

Figures 1 and 2 are partially sectional plan views showing the operation of a conventional auxiliary switch in the closed and shut off states of the switchgear, and Figure 3 is a cross-sectional view of a F-type gas breaker. Fig. 4 is a basic breaker control circuit diagram, Fig. 5 is a time chart showing the shape of each part of the breaker when the breaker shuts off 10 minutes after turning on, and Figs. 6 to 9.
6 shows an embodiment of the present invention, FIG. 6 is a plan view showing the neutral state of the auxiliary switch, FIG. 7 is a plan view showing its closing operation, and FIG. 8 is a plan view showing its closing state. A plan view, FIG. 9 is a plan view showing the open state, and FIGS. 1O and 11 are # in which the operation delay time of the auxiliary switch of the present invention is variable;
+=jM structure, FIG. 12 is a plan view of a first alternative embodiment of the present invention, and FIG. 13 is a plan view of a second alternative embodiment of the present invention. 3b...7 run section of the drive shaft of the V stone, 10...
Contact, f, 11 & 111b...Auxiliary switch contactor, 31...Biasing member (spring), 32...Lever, 33...Connection lever, 34...Auxiliary switch drive lever, 35.36...first and second pin, 53
...No4 case. Applicant's agent Patent attorney Hikoji Suzue Takeshi, r l
r≧1 Figure 5 Figure 6 b Figure 7 b ';j'SR diagram 1) Figure 21'τHr''4

Claims (3)

[Claims] (1) Contact 11! with the nJ moving part near the end of the closing and cutting operations performed by the moving part of the switchgear. A contact bottle that operates as the contact bottle moves, a rotating lever that rotates with the movement of the contact bottle, and a biasing force that applies a holding force to the rotating lever at the midpoint of the rotation and continues the rotation for a predetermined period of time. An auxiliary switch for a switchgear, characterized in that the auxiliary switch for a switchgear is equipped with: and a vertical contact that performs an opening/closing operation by rotation of the rotary lever. (2) The insulating auxiliary switch of the switchgear according to item 1 of the patent application, characterized in that the length of the contact bin is adjustable. (3) An auxiliary switch for a switchgear according to item 1 of the scope of the patent application, characterized in that the position of the fixing point of the guard member is movable.