JPH0777155B2 - Lightning arrester disconnecting device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightning arrester disconnecting device that disconnects a lightning arrester from an electric line when a lightning arrester fails.

[Prior Art] FIGS. 6 and 8 show a conventional lightning arrester disconnecting device disclosed in, for example, Japanese Patent Laid-Open No. 55-95284. In the figure,
The lightning arrester (1), the gap part (4) composed of the reactor (2) and the gap (3), and the separation part (7) composed of the fusible wire (5) and the disconnecting part (6) are connected to the metal fitting ( It is connected to the power transmission line (9) via 8). The power transmission line (9) is separately supported by the suspension insulator (10).
In FIG. 8, the lightning arrester (1) and the suspension insulator (10) are shown as equivalent circuits as electrostatic capacitance.

Next, the operation of the conventional lightning arrester disconnecting device having the above configuration will be described. When the lightning arrester (1) operates with a lightning impulse, the impedance of the reactor (2) increases due to the high frequency, and the lightning current does not flow to the fusible wire (5), but a voltage is applied to the gap (3). . Therefore, the lightning impulse current flows through the gap (3) and the shunt (11) to the connecting fitting (8). On the other hand, when the lightning arrester (1) is in an abnormal state, a commercial frequency ground fault current flows, but the impedance of the reactor (2) is sufficiently low because the frequency is low, and therefore the ground fault current passes through the reactor (2). , To the fusible line (5). When the fusible wire (5) is broken by the ground fault current, an arc is generated in this part, and the disconnection part (7)
The pressure in the space inside the insulating cylinder (12) increases. By increasing the internal pressure in this space, the lightning arrester (1) can be quickly separated from the power transmission line (9) by destroying the insulating cylinder (12).

[Problems to be Solved by the Invention] A conventional lightning arrester disconnection device is one in which a part of the device is destroyed due to an increase in pressure in the insulating cylinder (12) due to an arc after the fusible wire (5) is broken. Therefore, there is a problem that it is dangerous because a part of the device scatters during the disconnecting operation.

The present invention has been made in order to solve the above problems, and for lightning surge current and switching surge current,
It is an object of the present invention to obtain a lightning arrester disconnection device which is inoperative and operates against an alternating current when a lightning arrestor fails and can be separated from an electric line.

[Means for Solving the Problems] A lightning arrester disconnecting device according to the present invention includes a movable electrode disposed through a gap with a fixed electrode, a trigger disposed so as to face the movable electrode, and an intermediate portion. Is rotatably supported by a latch support, one end of which locks the movable electrode and the other end of which is locked by the trigger, and the latch when the fault current flows to the arrester. And unlocking means for unlocking the movable electrode,
And a spring that separates the movable electrode from the fixed electrode when the latch and the movable electrode are unlocked.

[Operation] In the present invention, when a fault current flows through the lightning arrester, the locking between the latch and the movable electrode is released by the operation of the unlocking means, and at the same time, the movable electrode is fixed by the elastic force of the spring. Isolated from and supported by lightning arresters.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. First
The figure is an overall front view showing the state in which the lightning arrester disconnection device is attached. The transmission line tower (14) has an arm (13) that projects horizontally, and one end is fixed to this arm (13). The power transmission line (9) is hung at the lower end of the suspension pendant (10) for the power transmission line. Also same arm (13)
, One end of the lightning arrester (1) is fixed to the suspension insulator (10) for the power transmission line with a predetermined insulation distance.
One end of the movable conductor (17) is rotatably supported by the support mechanism (15) at the lower end of the. The other end of the movable conductor (17) is connected to the disconnecting mechanism (16) mounted in electrical connection with the power transmission line (9) at the lower end of the suspension insulator (10). That is, when there is a lightning strike on the power transmission line (9), the lightning current passes from the disconnecting mechanism (16) through the movable conductor (17), further through the support mechanism (15) through the arrester (1), and through the arm (13). An electric circuit is constructed so as to reach the earth via the steel tower (14).

On the other hand, when the arrester (1) fails and the ground fault current starts to flow, the disconnecting mechanism (16) operates to disconnect the connecting portion of the movable conductor (17) and rotate it to the position indicated by the chain double-dashed line.

The component structure will be described below with reference to the detailed view shown in FIG. FIG. 2 is a sectional view of the support mechanism (15) for the movable conductor (17) on the left side and the separation mechanism (16) on the right side of the drawing.
One end of the mounting plate (24) is fixed to the lower part of the suspension insulator (10) for power transmission lines, and the other end has a cylindrical case (25) attached thereto in a state where rainwater and the like are prevented from entering. In the inner cylinder of the case (25), a reactor (2) wound in a toroidal shape on a cylindrical core (2c) made of a non-magnetic material is installed in the cylinder (27).
It is fixed by the outer circumference and the O-ring (55).

The lead wire (2a) of the reactor (2) is connected to the case (25), and the other lead wire (2b) is connected to the terminal block (30) attached to the trigger (20) molded of an insulating material. ing. Further, one end of the fusible wire (5), which is a component of the unlocking means, is firmly attached to the terminal block (30), and the other end of the fusible wire (5) is firmly attached to the movable electrode (19). Has been. This fusible wire (5) is released from the first spring (21) which tries to release the lock between the trigger (20) and the roller (31) attached to the end of the latch (22) by the pin (32). Stopping power. That is, tensile force always acts on the fusible wire (5), and in order to prevent the creep phenomenon, a stainless steel wire for spring is used for the material of the fusible wire (5) in the embodiment.

A cylinder (27) formed of an insulating material is fixed to a case (25), and a latch support base (rotatably supporting a central portion of a latch (22) by a hinge pin (33) at its end ( 28) is installed. In addition, a second spring (23) for giving a separating energy is provided on the inner cylinder portion of the cylinder (27).
A piston (29) movable by is slidably mounted. The ring-shaped piston (29) has a Z-shaped cross section and moves a certain distance when the second spring (23) is released, and then locks with the stepped portion of the cylinder (27). So that it doesn't jump out. At this time, the moving speed of the piston (29) is adjusted by the size and position of the air vent hole (29a) provided on the side surface of the piston (29). The end of the piston (29) contacts the movable electrode (19), and the inner circumference of the end of the movable electrode (19) is fitted to the convex root of the latch locking portion provided on the movable electrode (19). The movable electrode (19) is positioned. Due to this positioned state, a predetermined discharge gap (3) is maintained between the outer circumference of the discharge part and the inner discharge part of the fixed electrode (18) attached to the case (25). In addition,
A hole (19a) for discharging the accumulated water generated by dew condensation is provided in the lower part of the recessed portion that engages with the latch (22) provided in the movable electrode (19), and the water flowing out from it is made of an insulating material. It is discharged to the outside through a drain hole (34a) provided in the movable lid (34).

The disk-shaped movable lid (34) is connected to the movable electrode (19) and the connection fitting (3
It is attached so as to be sandwiched by 6), and the disk-shaped inner circumference is movable along the shaft portion (19b) provided on the movable electrode (19). Further, the outer peripheral portion is fitted with the stepped hole of the cover (26) attached to the case (25), and the concave portion (34b) is provided in the outer peripheral portion at several places along the circumference. ing. The compression spring (35) is provided to bring the movable lid (34) into close contact with the cover (26) to close the lid.
The connection fitting (36) attached to the movable electrode (19) by the bolt (40) has a hole and a movable conductor (17) having a large clearance for inserting one end side of the round bar-shaped movable conductor (17). An insertion hole for the bush (38) is provided to prevent it from coming off, and one end of the flexible cable (37) is attached. The other end of the flexible cable (37) is attached to the movable conductor (17) by a bolt (39) via a bush (38) so that it can be energized.

The other end of the movable conductor (17) is inserted into a loose hole provided in the ratchet wheel (44) and is retained by the bush (38).
The bush (38) is attached to the movable conductor (17) with a bolt (39) together with one end of the flexible cable (53), and the other end of the flexible cable (53) is connected to the mounting plate (42).
The ratchet wheel (44) is a case (43) fixed to the mounting plate (42).
Rotatably attached to the shaft (45) by the shaft (45)
Are supported by electrically insulated bearings (46).

The mounting base (47) is fixed to the mounting plate (42), and the claw (48) is rotatably supported by the pin (49) and the insulating bearing (50), and the lower end of the mounting base (47) shown in the figure. A damper (51) is attached to the.

The spring (52) is for constantly pressing the pawl (48) against the outer periphery of the ratchet wheel (44). The mounting plate (42) is attached to the lower portion of the lightning arrester (1) so that it can be energized. (54) shows a frozen state, and this phenomenon increases especially when this device is installed in a transmission line tower in a mountainous area. For this reason, an anti-icing agent is coated or painted on the portions of the apparatus where the fixed portion and the movable portion, which are exposed to the outside air, are close to each other.

In this embodiment, the movable conductor (17) is covered with a colored Teflon-based heat-shrinkable tube on the outer periphery thereof.
A safety pin (41) is a safety pin, and when the device is attached to the steel tower arm (13), a folding that operates due to an unexpected failure of the disconnecting device may harm the worker. The operation of the device is blocked, and it is removed at the end when the installation of the device is completed.

Next, the operation of the above embodiment will be described. 1 to 3, when the lightning arrester (1) operates by a lightning impulse, the lightning that flows from the power transmission line (9) through the mounting plate (24) and the case (25) due to the high frequency. The current is
The impedance of the reactor (2) connected to the case (25) increases, and it does not flow into the fusible wire (5) connected in series with the reactor (2), so that voltage is applied to the gap (3). Become. Therefore, the lightning impulse current flashes from the fixed electrode (18) connected to the case (25) to the movable electrode (19) between the gap (3) and flows from the connection fitting (36) to the cable (37) → It flows to the lightning arrester (1) via the movable conductor (17) → cable (53) → mounting plate (42). At this time, when flashing in the gap (3), the surrounding space pressure rises. At this time, the instantaneous rising pressure inside is
The movable lid (34) overcomes the pressure of the compression spring (35) and is pushed up, and a gap is created at the contact portion between the movable lid (34) and the cover (26). Since this gap and the outer peripheral recess (34b) provided in the movable lid (34) communicate with the outside, the internal pressure is lowered.

On the other hand, when the lightning arrester (1) is in an abnormal state, the ground fault current at the commercial frequency has a low frequency, so that the impedance of the reactor (2) is sufficiently low, and therefore the ground fault current can be passed through the reactor (2). It flows to the melting line (5). Soluble line (5)
Is blown when a predetermined current, in the embodiment, a ground fault current of about 50 A flows. When the fusible wire (5) melts, the trigger (20) moves upward by the first spring (21). Then, the engagement between the roller (31) attached to the end of the latch (22) and the trigger (20) is released, and the pair of latches (22) is free. At this time, a force acts on the engaging portion between the lower end of the latch (22) and the movable electrode (19) by the second spring (23) via the piston (29) to the outside of the rotation center of the latch (22). Therefore, the lower ends of the pair of latches (22) rotate toward the fusible wire (5) shown in the figure, and the latches (2
The locking relationship between the movable electrode (19) and the movable electrode (19) is released and the movable electrode (1
9) jumps downward. The state at this time is shown in FIG.

The projecting movable electrode (19) is united with the movable conductor (17) connected to the ratchet wheel (44) to rotate about a rotating shaft (45) provided on the case (43), and the claw is moved. The contact portion (44b) provided on the vehicle (44) collides with the damper (51) and the rotation stops. Then, the reaction force of the collision and the self-weight cause reverse rotation, but the stop portion (48a) of the pawl (48) engages with the engaging portion (44a) provided on the ratchet wheel (44), and as shown in FIG. It is held in the state of the dashed line, and the electric line between the transmission line side and the arrester side is completely disconnected. In addition, the movable conductor (17) does not sway due to wind and rain force, vibration of the steel tower arm (13), etc. to approach the power transmission line, and the insulation distance is not shortened.

FIG. 4 is a cross-sectional view showing another embodiment of the present invention, in which the same or corresponding parts as in FIGS. 1 to 3 are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, the lead wire (60) of the reactor (2) is connected to the case (25), and the other lead wire (61) is connected to a trigger (62) formed of a conductive material. First
The spring (21) blocks the force that tries to release the lock between the trigger (62) and the roller (31) attached to the end of the latch (22) by the pin (32). A latch support base (28) that rotatably supports the central portion of the latch (22) with a hinge pin (33) is attached to the case (25) via an insulating plate (63). Further, one end of a second spring (23) for giving a separating energy is attached to the insulating plate (63).
A magnetic body (64), which is a component of the unlocking means, is attached to the upper part of the trigger (62).

Next, the operation of another embodiment of the present invention will be described.
When the lightning arrester (1) operates with a lightning impulse, the lightning current that tries to flow from the power transmission line (9) through the mounting plate (24) case (25) is connected to the case (25) due to the high frequency. The impedance of the generated reactor (2) increases, does not flow into the reactor (2), and a voltage is applied to the gap (3). Therefore, the lightning impulse current is fixed to the fixed electrode (18) connected to the case (25).
Flow through the gap (3) to the movable electrode (19) and then to the lightning arrester (1) via the movable conductor (17) → cable (53) → mounting plate (42).

On the other hand, when the arrester (1) is in an abnormal state, the ground fault current of the commercial frequency has a low frequency, so that the impedance of the reactor (2) is sufficiently low, so that the ground fault current flows to the reactor (2). When current flows through the reactor (2), the reactor (2) operates as an electromagnet, and the trigger (62)
The magnetic body (64) attached to is sucked. When this suction force overcomes the pressing force of the first spring (21), the trigger (6
2) moves upward. Then, the engagement between the roller (31) attached to the end of the latch (22) and the trigger (62) is released, and the pair of latches (22) becomes free. At this time, a force acts on the locking portion between the lower end of the latch (22) and the movable electrode (19) by the second spring (23) to the outside of the rotation center of the latch (22). (twenty two)
The lower end of the movable electrode (19) pivots toward the center and the latching relationship between the latch (22) and the movable electrode (19) is released, and the movable electrode (19) jumps downward. The state at this time is shown in FIG.

Although the movable conductor (17) is swung downward in the first and second embodiments, it may be swung horizontally. Further, in both of the embodiments, the disconnection device for the transmission line arrester has been described, but it can be applied to any place where the arrester is used. Further, in another embodiment of the present invention, the magnetic substance is attached to the upper part of the trigger (62), but the trigger (62) itself may be the magnetic substance.

[Effects of the Invention] As described above, in the lightning arrester disconnecting device of the present invention, when a fault current flows through the lightning arrester, the locking between the latch and the movable electrode is released by the operation of the unlocking means, and at the same time. Since the movable electrode is separated from the fixed electrode by the elastic force of the spring, there is an effect that the disconnection operation can be performed without destroying the device against the failure of the lightning arrester.

[Brief description of drawings]

FIG. 1 is an overall front view showing a state in which a lightning arrester separating device of one embodiment of the present invention is attached, FIG. 2 is a sectional view showing one embodiment of the present invention, and FIG. 3 is the use of FIG. FIG. 4 is a sectional view showing an embodiment, FIG. 4 is a sectional view showing another embodiment of the present invention,
FIG. 5 is a cross-sectional view showing the usage mode of FIG. 4, FIG. 6 is a cross-sectional view showing an example of a conventional lightning arrester separating device, FIG. 7 is an overall view of FIG. 6, and FIG. It is a circuit diagram of an apparatus. In the figure, (1) is a lightning arrester, (2) is a reactor,
(3) is a gap, (5) is a fusible wire, (9) is a transmission line,
(18) is a fixed electrode, (19) is a movable electrode, (20), (62)
Is the trigger, (21) is the first spring, (22) is the latch,
(23) is a second spring, and (64) is a magnetic body. In each drawing, the same reference numerals indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yusaku Horinouchi 8-1-1 Tsukaguchihonmachi, Amagasaki City, Hyogo Prefecture Sanryo Electric Co., Ltd. Itami Works (56) Reference JP-A-55-95284 (JP, A) JP 59-173985 (JP, A) JP 60-32269 (JP, A) JP 57-1573 (JP, Y1)

Claims (1)

[Claims] 1. A lightning arrester disconnection device for disconnecting the lightning arrester from an electric path when a fault current flows through a lightning arrester connected in series to the parallel circuit by connecting a reactor and a gap in parallel. A movable electrode disposed via a gap with the fixed electrode, a trigger disposed so as to face the movable electrode, an intermediate portion rotatably supported by a latch support, and one end portion movable electrode. A latch whose other end is locked to the trigger, a lock releasing means for releasing the lock between the latch and the movable electrode when the fault current flows through the lightning arrester, and the latch And a spring that separates the movable electrode from the fixed electrode when the engagement with the movable electrode is released, and the movable electrode separated from the fixed electrode is supported by the lightning arrester. Lightning arrester disconnecting device.