JPS6233224Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is used to open the contacts of an air switch installed in a distribution line (for example, an automatic air switch for a fault section detection device). This relates to an open power storage mechanism that can store power independently even if it has two springs for power storage, and even if the power circuit for the magnet for power storage is of small capacity. To provide an opening force storage mechanism for an air switch, which allows both springs to work together when returning them to obtain a large operating force for opening the switch. This is what I am trying to do.

The drawings showing the embodiments of the present application will be described below. In the operating mechanism shown in FIG. 1, Mg ₁ is a magnet for storing opening force (only the plunger of the magnet is shown in the drawing), and is configured to pull the link 1 downward in the drawing when energized. A switch _m1 is operated by an operation piece 1' that moves together with the link 1 when the magnet _Mg1 is operated, and a micro switch is used. 2 and 3 are links for interlocking,
Reference numerals 4 and 5 denote levers, which are fixed to a connecting shaft 8 that is pivotally supported by a base frame (not shown). _S1 is a spring for opening the contact portion, and is stretched between the lever 5 and a base frame (not shown). Reference numeral 9 indicates a lever fixed to the connecting shaft 8, and reference numeral 10 indicates a link pivotally attached to the lever 9.

Next, Mg ₂ is the charging magnet (magnet Mg ₁
(Similarly, only the plunger is shown), and is configured to pull the link 11 downward in the figure when energized. m ₂ is a switch, an operating piece 11' that moves together with the link 11 when the operation of the magnet Mg ₂ is completed;
It is operated by a micro switch. 12 and 13 are levers connected via a shaft 12', and _S2 is a spring for opening the entire area, which is stretched between the lever 13 and a base frame (not shown). Reference numeral 14 denotes a link pivotally attached to the lever 13, and reference numeral 15 denotes an opening/closing lever, which is fixed to an output shaft 16 pivotally supported by a base frame (not shown). Further, this lever 15 is pivotally connected to the link 14 via a connecting pin 15'. Furthermore, this pin 15' constitutes the first moving member in the linking mechanism 27 between the link 10 and the lever 15, and is placed in the elongated hole 10a provided in the link 10, and serves as the second moving member in the linking mechanism 27. It is configured to be connected to the end edge 10a' of the member as described below. Note that this linking mechanism 27 is connected to the lever 15 as shown in FIG. 1B.
A long hole 15a is provided in a part of the lower edge 15.
Alternatively, a' may be the first moving member, and the pin 10' fixed to the link 10 may be the second moving member, and these may be placed in the elongated hole 15a. Reference numeral 17 denotes an output lever fixed to the output shaft 16, which is connected in a well-known manner to a movable shaft of a switch (not shown).

Next, reference numeral 18 denotes a manual operation handle, which is fixed to an end 22a of a manual operation shaft 22 pivotally supported on the base frame. 19 is a lever fixed to the end 22a, 20 is a link, 21 is a lever pivoted to a base frame (not shown), and _S3 is a handle spring interposed between the lever 21 and the base frame, which is a compression spring. is used. S ₄
is a handle spring stretched between the lever 19 and the base frame. Reference numeral 23 denotes a manual power storage shaft pivotally supported on the base frame, and the manual operation shaft 22 is a transmission piece 2 integrated with the shaft 22.
2b and transmission pieces 23a, 23c integrated with the shaft 23
(shown in FIG. 4), and the output shaft 16 is connected to the transmission piece 23.
b, 16a are configured to be able to interlock with each other via a transmission portion 26 constituted by 16a. 24 is a manual power storage lever fixed to the shaft 23, 28 is a transmission mechanism, and the first transmission member 7 is pivotally attached to the lever 24.
and a second transmission member 6 pivotally attached to the lever 5. Further, these transmission members 6 and 7 are configured to be removable as shown in FIG. 3, so that operations such as those described below can be performed.

Next, in the control circuit shown in FIG.
B is a power terminal, which is connected to a power supply side (substation side) distribution line among the distribution lines connected to the switch via a power transformer (for example, 6900/110). SA is a surge absorber, R is a relay, and _r1 is a protective resistor, which protects the coil by limiting the current flowing through the coil of relay R, and the following capacitor _C1
In addition, a delay release time is set. Capacitor _C1 is a capacitor for setting delay time, and _D5 is a diode for rectification. next
D ₁ and D ₂ are diodes, and SCR ₁ and SCR ₂ are silicon-controlled rectifying elements, which constitute a full-wave rectifying bridge for the magnet Mg ₁ . _R1 is a changeover switch, and the contact of the above-mentioned relay R is used. It also consists of a neutral contact c, a normally open a contact that connects with the neutral contact c when the relay R is activated, and a normally closed b contact that connects with the neutral contact c when the relay R is restored. Next, D ₃ and D ₄ are diodes,
SCR ₃ and SCR ₄ are silicon-controlled rectifying elements, and these constitute a full-wave rectifying bridge for the magnet Mg ₂ . _R2 is a changeover switch, and has the same configuration as the changeover switch _R1 described above. Next, the gate signal circuits of the silicon-controlled rectifying elements SCR ₁ to SCR ₄ will be explained. D ₈ to D ₁₁ are diodes for turning on the SCR, which are turned on by applying a gate signal (gate current) to each connected silicon-controlled rectifier SCR. They are also used to prevent the silicon-controlled rectifying element from being destroyed due to reverse gate current (current flowing from the cathode to the gate). r ₃ and r ₄ are gate protection resistors that control the magnitude of the gate signal.
It is designed to protect the silicon controlled rectifier element. D ₁₂ and D ₁₃ are gate signal diodes. Diode D ₁₂ conducts when a positive half wave is applied to the power supply terminal, turning on SCR ₂ and SCR ₃ , and diode D ₁₃ provides a negative signal to the power supply terminal. It is configured to conduct when a half-wave of SCR ₁ and SCR 4 are applied, thereby turning on SCR 1 and SCR ₄ . These are connected to face each other as shown in the figure to prevent the starting current circuit of the magnets Mg ₁ and Mg ₂ from being short-circuited. Also, the switches m ₁ a, m ₁ b, m ₂ b interposed in this gate signal circuit are the same as the switches m ₁ , m ₂
shows the contact points. Also, the subscript a indicates that each switch is always open (closed when the switch operates).
b indicates a normally closed contact (opens when the switch is operated).
Furthermore, among these switches, switch m ₁ a acts as a normally open first switch together with elements _{SCR 3} and SCR ₄ , and switch m ₂ b acts as a normally closed second switch together with elements SCR 3 _and SCR 4. without switch
m ₁ b functions as a normally closed third switch together with elements SCR ₁ and SCR ₂ .

Next, SCR ₅ is a silicon controlled rectifier used as an intermittent switch. Code r ₂ , D ₆ , D ₁₄ ,
The members indicated by C ₂ constitute the phase control circuit of this element SCR ₅ , r ₂ is a resistor, D ₆ and D ₁₄ are diodes, and C ₂ is a capacitor. then C ₃
is a reverse excitation capacitor, and _D7 is a charging diode, which charges capacitor _C3 to the polarity shown.

Next, the operation of the above configuration will be explained. (From now on, in order to simplify the explanation, we will mainly use symbols.) (A) Apply voltage to power supply terminals A and B (for example, AC80
(1) Preparation operation: In this case, current flows as follows and relay R operates.

C ₁ charging +A→D ₅ →C ₁ →−B R coil current +C ₁ →r ₁ →R→−C ₁ C ₃ charging +A→D ₁ →D ₇ →C ₃ →Mg ₂ →
R ₂ a→D ₄ →−B This closes the switches R ₁ a and R ₂ a, and R ₁ b and R ₂ b
becomes open.

(2) Open power storage operation: Magnet Mg ₁ operates following the preparation operation. The starting current of the magnet Mg ₁ is set to about 22A, for example.

When the power supply is a positive half wave (when terminal A becomes +) SCR ₂ gate current +A→D ₁ →Mg ₁ →R ₁ a→D ₁₂ →
m ₁ b→r ₃ →D ₉ →SCR ₂ →−B Mg ₁ starting current +A→D ₁ →Mg ₁ →R ₁ a→SCR ₂
→−B When the power supply is a negative half wave (when terminal B becomes +) SCR ₁ gate current +B→D ₃ →Mg ₂ →R ₂ a→D ₁₃ →
m ₁ b→r ₃ →D ₈ →SCR ₁ →Mg ₁ →R ₁ a→D ₂ →−A Mg ₁ starting current +B→SCR ₁ →Mg ₁ →R ₁ a→D ₂
→-A When the operation of magnet Mg ₁ is completed, switch m ₁ b
is open and m ₁ a is closed.

(3) Closing operation: Mg ₂ operates after the operation of Mg ₁ is completed.

When the power supply is a positive half wave, SCR ₃ gate current +A→D ₁ →Mg ₁ →R ₁ a→D ₁₂ →
m ₁ a→m ₂ b→r ₄ →D ₁₀ →SCR ₃ →Mg ₂ →R ₂ a→D ₄ →
-B Mg ₂ starting current +A→SCR ₃ →Mg ₂ →R ₂ a→D ₄
→−B When the power supply is negative half wave, SCR ₄ gate current +B→D ₃ →Mg ₂ →R ₂ a→D ₁₃ →
m ₁ a→m ₂ b→r ₄ →D ₁₁ →SCR ₄ →−A Mg ₂ starting current +B→D ₃ →Mg ₂ →R ₂ a→SCR ₄
→-A When the operation of Mg ₂ is completed, the switch m ₂ b is opened.

(4) Holding: After both Mg ₁ and Mg ₂ complete their operations, current flows through them as follows to maintain their operating state.

A voltage as shown in FIG. 5a is applied to the power supply terminal. In this case, when the power supply is in the negative half wave, the current flows as follows, and the capacitor C ₂
is charged up to 1/2 of a half wave (point A).

+B _→ C ₂ →D ₆ →−A When _the capacitor C ₂ is charged beyond point A, it is discharged in the next circuit, and the discharge is completed at point B. Note that the time for this discharge is set based on the mutual relationship of r ₂ and C ₂ . When this discharge is completed, the power supply is in a positive half wave, so C ₂ is then charged with the opposite polarity. When the charging voltage of _C2 reaches a value sufficient as a trigger signal for SCR ₅ (point C), SCR ₅ turns on (point 2 in Fig. 5c).

SCR ₅ gate current +A→r ₂ →D ₁₄ →SCR ₅ →Mg ₂ →
R ₂ a → D ₄ → −B When SCR ₅ is turned on, current flows from the power supply to Mg ₁ and Mg ₂ .

Holding current (power supply) +A→D ₁ →Mg ₁ →R ₁ a→
SCR ₅ →Mg ₂ →R ₂ a →D ₄ →−B This current flows intermittently every cycle of the power supply, as shown in FIG. 5d.

On the other hand, while such current does not flow, current flows in each magnet as follows due to the respective back electromotive force. (Mg ₁ →R ₁ a→D ₂ →D ₁ →Mg ₁
and Mg ₂ → R ₂ a → D ₄ → D ₃ → Mg ₂ holding current (Mg ₁ ) Mg ₁ → R ₁ a → D ₂ → D ₁ → Mg ₁ holding current (Mg ₂ ) Mg ₂ → R ₂ a → D ₄ → D ₃ → Mg ₂ Therefore, as shown in Figure 5e, current flows through Mg ₁ and Mg ₂ (e.g., about 2 A), and the operating state is maintained. .

(A') The operation of the operating mechanism when the above operation is performed in the control circuit is as follows. In Fig. 1, when link 1 is pulled by the action of Mg ₁ , link 2 and levers 4 and 5 operate in the directions of the arrows, and spring S ₁ is expanded to store its force (opening force storage operation). ). When this operation is completed, the switch _m1 is actuated by the operating piece 1'. In this case, the lever 9 and the link 10 also operate in the directions of the arrows, but since the pin 15' remains in the elongated hole 10a of the link 10, the operating force is not applied to anything else.

Next, when Mg ₂ operates and link 11 is pulled, levers 12 and 13 operate in the directions of the arrows, and spring S ₂
is extended and its power is stored. At the same time, the lever 15 is actuated in the direction of the arrow via the link 14, the output shaft 16 and the output lever 17 are rotated in the direction of the arrow (toward the closing side), and a switch connected to the output lever 17 is closed. (Loading operation). When this operation is completed, switch m ₂ is turned on by operation piece 11'.
is activated.

As a result of the above operations, the operating mechanism enters the closing state as shown in FIG. 3, and both magnets Mg ₁ and Mg ₂ are held in this state. In this state, the edge 10a' of the elongated hole 10a and the pin 1
A gap d is maintained between 5' and 5'. Furthermore, the above operations are naturally performed instantaneously at a high speed.

(B) In case of opening operation due to stoppage of voltage application to power supply terminals A and B (for example, when a circuit breaker at a substation is cut off due to a fault in a distribution line) (1) Delay: There is no voltage between terminals A and B. Even if the power is removed, both the relay R and the magnets Mg ₁ and Mg ₂ continue to be held for a while (for example, set to 2 to 3 seconds).

R coil current +C ₁ →r ₁ →R→−C ₁ Mg ₁ residual current Mg ₁ →R ₁ a→D ₂ →D ₁ →Mg ₁ Mg ₂ 〃 Mg ₂ →R ₂ a→D ₄ →D ₃ →Mg ₂ (2) Open: When the voltage of _C1 decreases, R returns,
The charge of C ₃ is discharged in the circuit of R ₁ b, Mg ₁ , R ₂ b, and Mg ₂ , and a current flows in Mg ₁ and Mg ₂ in the opposite direction to that during holding, canceling the residual magnetism, and Mg ₁ and Mg ₂ instantly loses its power and opens up.

Reverse excitation current +C ₃ →R ₁ b→Mg ₁ →R ₂ b→Mg ₂ →−
The operation of the operating mechanism when the above operation is performed in the C ₃ (B') control circuit is as follows. In FIG. 3, when the magnets Mg ₁ and Mg ₂ are released and lose their force, the lever 5 moves in the direction of the arrow due to the energy stored in the spring S ₁ Link 10 moves in the direction of the arrow. And the edge 10 of the long hole 10a
When a' collides with pin 15', lever 15 moves in the direction of the arrow. As a result, the output shaft 16 and the output lever 17 are rotated in the direction of the arrow (opening side), and opening of the switch is started. At the same time, the energy stored in the spring S ₂ moves the lever 13 in the direction of the arrow, so this spring S ₂ cooperates with the spring S ₁ to move the output shaft 16 and the output lever 17 as described above.
make the rotation. The above-mentioned opening by the spring _S1 is carried out until the lever 4 hits the stopper 30, during which time the contacts of the switch are opened. Thereafter, the output shaft 16 and the output lever 17 continue to rotate via the lever 13, link 14, and lever 15 due to the spring _S2 , and the switch is completely opened. In the above case, due to the gap d previously formed between the edge 10a' and the pin 15', the link ₁ by the spring S1
The operating force in the direction of the arrow 0 impacts the pin 15' as if hitting it. Therefore, even if the contacts of the switch become welded,
The impact force ensures that the contacts are opened.

Through the above operations, the operating mechanism returns to the open state as shown in FIG.

(C') When closing the switch manually (1) Rotate the manual operation handle 18 in the direction of the arrow in Fig. 1. Then, the manual operation shaft 22 is rotated in the direction of the arrow (towards the closing side), the manual energy storage shaft 23 is also rotated in the direction of the arrow via the transmission part 25, and the spring S is rotated via the lever 24, the transmission mechanism 28, and the lever 5. ₁ power storage starts. When the transmission piece 23b hits the transmission piece 16a in the transmission part 26, the output shaft 16 and the output lever 17 are rotated in the direction of the arrow to start closing the switch, and the spring is activated via the lever 15, link 14, and lever 13.
Start accumulating power for S ₂ .

(2) At the same time, lever 19, link 20,
The toggle mechanism by the lever 21 also moves in the direction of the arrow to begin compressing the spring _S3 . Eventually, when the lever 19 and the link 20 cross the dead point and become bent, the biasing force of the spring _S3 is reduced to the biasing force of the spring _S4.
The spring acts in the direction of rotating the shaft 22 in the direction of the arrow (the direction of closing) together with the
Supports the storage power of S ₁ and S ₂ and moves towards automatic input.

(3) The lever 24 closes when the switch is inserted into the contact point.
As the transmission member 7 also bends from the dead point, the biasing force of the spring _S1 changes in the closing direction. After this, the switch hits the stopper of the switch and stops, and the closing is completed, resulting in the state shown in FIG. 4.

(D') When manually opening the switch (1) In Fig. 4, when the handle 18 is rotated in the direction of the arrow and the manual operation shaft 22 is rotated in the direction of the arrow (to the opening side), the lever 19 Spring S ₄
is pulled, and the spring is released by the link 20 and lever 21.
S ₃ is compressed and each force is stored. When the toggle mechanism of the lever 19 and the link 20 exceeds the dead point, the force of the spring _S3 changes to the direction of opening (in the direction of the arrow) with respect to the shaft 22.

(2) Eventually, when the transmission piece 22b hits the transmission piece 23c, the shaft 23 also begins to rotate in the direction of the arrow, and the lever 24
When the transmission member 7 exceeds the dead point, the lever 5 moves in the direction of the arrow due to the force of the spring _S1 . Thereafter, the same operation as in the case of automatic opening is performed, and the opening of the switch is completed and the state shown in FIG. 1 is reached. In the above case, since the transmission piece 22b of the transmission part 25 rotates in the direction of the arrow before the transmission piece 23a, there is no problem with the rapid rotation of the shaft 23 due to the sudden operation of the spring _S1 .

Furthermore, each spring S ₁ shown in the above embodiments
~ S ₄ may replace the tension spring with a compression spring, and the compression spring with a tension spring, respectively. In that case, it goes without saying that the fixing position of each spring with respect to the base frame can be changed using a general method so that biasing forces in the same direction are applied to the levers to which each spring is connected.

As mentioned above, this idea uses two springs.
Even if S ₁ and S ₂ are used to store force in these springs, even if the first spring S ₁ stores force first, the operating force will not reach the second spring S ₂ . Therefore, first magnet Mg ₁ is operated to store force in spring S ₁ , and then second magnet Mg ₂ is operated to store force in spring S ₂ . This has the effect that even if the power circuit for the magnets Mg ₁ and Mg ₂ has a small capacity, it can be used. Moreover, even if the first and second springs S ₁ and S ₂ are configured to store force individually, when returning these springs, both springs S ₁ and S ₂ must be operated together. Since the output shaft 16 can be rotated, a large operating force can be obtained on the output shaft 16, which has the great effect of reliably opening the switch connected to the output shaft.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, in which Fig. 1 is a perspective view of the operating mechanism showing the open state, Fig. 2 is a circuit diagram of the control circuit, and Figs. 3 and 4 show the automatic closing state and manual closing state, respectively. FIG. 5 is a perspective view of the operating mechanism showing the state, and FIG. 5 is a diagram showing the state of voltage and current of each part in the holding state. Mg ₁ , Mg ₂ ... magnet, S ₁ , S ₂ ... spring,
16...Output shaft, 15...Opening/closing lever, 27...
Interlocking mechanism.

Claims (1)

[Scope of utility model registration request] It is equipped with an output shaft 16 that can freely rotate back and forth between a closed state position and an open state position, and has an opening/closing lever 15 protruding radially from the output shaft 16, and an opening/closing lever 15. The movable end of 15 is provided with a second spring S 2 for biasing the output shaft 16 in the opening direction, and a second spring S ₂ for operating the second spring S ₂ in the direction of accumulating force. ₂ , and on the other hand, the opening/closing lever 15
It is provided with one end of a link 10 that can move forward and backward in close proximity to the movable end of the link 10, and a long hole 10a that is long in the forward and backward direction of the link 10 is provided at either one end of the link 10 or the movable end of the opening/closing lever 15, The other of the movable end of the opening/closing lever 15 or one end of the link 10 is provided with a linking mechanism 27 comprising a pin 15' located in the elongated hole 10a and engaged with the edge of the elongated hole. Furthermore, at the other end of the link 10 in the linking mechanism 27, a first spring S ₁ is provided for biasing the output shaft in the opening direction.
and a first magnet Mg ₁ for operating the first spring S ₁ in the direction of accumulating force, and the positional relationship between the elongated hole 10a and the pin 15' is similar to that of the output shaft. When the first and second springs S 1 and S 2 are in the open position or closed position and the force of the first and second springs S ₁ and S ₂ are the same, both elongated holes 10 a
A pin 15' is located near one edge of the
Even when the output shaft is in the open position, link 1 is activated by the operation of the first magnet Mg ₁ .
0 is moved and the force is stored only in the first spring _S1 , the pin 15' is in a related position located in the elongated hole 10a and far from the one edge mentioned above. An open power storage mechanism in an air switch, characterized in that: