JP3101340B2 - Arrester separation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arrestor disconnecting device, and more particularly to an arrestor disconnecting device that disconnects a ground circuit and displays a signal when a ground fault current flows due to a decrease in insulation of characteristic elements of the arrester.

[0002]

2. Description of the Related Art An arrester having a characteristic element for absorbing a lightning surge caused by an induced lightning or the like is provided in a distribution line and distribution equipment. The characteristic element is composed of a metal oxide such as ZnO, and is normally turned off by a valve mechanism, but when a lightning impulse voltage is applied, it is turned on and discharged to the ground through a ground circuit. This prevents the distribution line and distribution equipment from lightning damage. When the lightning impulse voltage decreases, the characteristic element is turned off again, and the subsequent current is cut off.

A conventional arrester has a disconnecting device for disconnecting a characteristic element from a ground circuit. When the insulation characteristic of the characteristic element is reduced and a ground fault current flows, it is detected to activate a plunger. The separation mechanism is operated to separate the characteristic element from the ground circuit.

[0004]

However, according to the conventional arrestor separating device, the plunger mechanism and the separating mechanism are provided independently of the grounding circuit, so that the mechanism becomes complicated and the size is reduced. Have difficulty.

Accordingly, an object of the present invention is to simplify the structure,
Further, an object of the present invention is to provide an arrestor separating device capable of reducing the size.

[0006]

According to the present invention, a plunger is used as a first member of a grounding circuit, and a second member constituting the grounding circuit is used as a plunger in order to simplify the structure and reduce the size. An arrester disconnecting device is provided in which a second member is disengaged from a plunger to disconnect a ground circuit when a solenoid is actuated and a plunger is moved by a ground fault current.

[0007]

When the insulation resistance of the characteristic element decreases, a ground fault current flows through the ground circuit. The solenoid is energized by this ground fault current, and the plunger, which is the first member forming the ground circuit, is attracted against the spring force. The second that was caught on the plunger by the movement of this plunger
Is removed. As a result, the ground circuit is cut off, and the characteristic element of the arrester is separated from the ground circuit.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The arrestor separating device of the present invention will be described below in detail.

FIGS. 1 and 2 show an embodiment of the present invention, in which an arrester element 1 (series gap if necessary) such as ZnO is housed in a watertight porcelain insulator (not shown). The lower end of the porcelain insulator is sealed to the upper end of the housing 11. The arrester element 1 is pressed against the lower electrode 2 on the electrode base 3 by an elastic mechanism (not shown), and the electrode base 3 is pressed against a spring 4 fixed to an insulating substrate 5. The outer periphery of the insulating substrate 5 is sealed on the inner peripheral surface of the housing 11, and the solenoids 7A and 7B are fixed to the lower surface thereof. The solenoids 7A and 7B are supported by the yoke 6, and the plunger 8 is located inside the yoke. A small gap (not shown) is provided in parallel with the solenoids 7A and 7B. As shown in FIG. 3, the plunger 8 has a hooking projection 8A, an end 8B of which is fixed to the yoke 6 by a spring 10, and is urged leftward in the drawing. Also,
The other end of the plunger 8 faces a plunger receiver 8C fixed to the yoke 6. As shown in FIG. 3, the hook projection 8A of the plunger 8 has a hook hole 9A for the electrode rod 9.
Is hooked on. A winding spring 15 for urging the electrode rod 9 downward is provided at a lower end of the electrode rod 9, and is engaged with an engagement hole 13 </ b> B of an engagement plate 13 </ b> A of the red cylindrical display body 13 at a predetermined position. ing. The display 13 is located on the outer periphery of the cylindrical display guide 14, and the engagement plate 13A is located inside the display guide 14 through the cutout portion 14B of the display guide 14. In the above configuration, FIG. 1 shows a state where the ground circuit including the plunger 8 and the electrode rod 9 is not disconnected, and FIG. 2 shows a state where the ground circuit is disconnected. FIG.
Indicates the relationship between the display 13 and the display guide 14, and further,
5A and 5B show a circuit configuration related to the operation described below. FIG. 5A corresponds to FIG. 1, and FIG. 5B corresponds to FIG. Although not shown in FIGS. 1 and 2, the spring 4 is electrically connected to the input end of the solenoid 7A, and the output end of the solenoid 7B is electrically connected to the plunger 8. 5 (a) and 5 (b) show solenoids 7A and 7B as 7
As shown.

The operation will be described below. When the arrester element 1 is healthy, a ground fault current does not flow due to its high resistance even if a ground voltage of the distribution line 100 is applied. When a lightning impulse is applied in this state, the lightning impulse is discharged due to the varistor characteristics of the arrester element 1, and the lightning surge voltage is absorbed. Since the steepness (di / dt) of the lightning impulse current is very large, the impedance (Ldi / dt) of the solenoid 7 (7A, 7B) becomes very large. Therefore, the small gap 5 provided in parallel with the solenoid 7
0 is discharged and discharged to the ground via the plunger 8 and the electrode rod 9. As a result, the solenoid 7 is not energized, and the plunger 8 does not move. Therefore, the plunger 8 and the electrode rod 9 are maintained in a hooked state.

On the other hand, when the arrester element 1 is deteriorated and the insulation resistance is lowered, a leakage ground current flows even at the ground voltage of the distribution line 100. Since the ground fault current is mainly a commercial frequency current, di / dt becomes small. Therefore, a current flows to the solenoid 7, the plunger 8 is magnetized and moves, the hooks 8A and 8B are disengaged, the ground circuit is opened, and the ground fault current is cut off. In the state where the grounding circuit is disconnected, even if a ground voltage (4 KV) is applied, no flashover occurs. Therefore, even if the arrester element 1 fails, the grounding circuit is temporarily disconnected. It can be resent to the distribution line 100 without being removed immediately. For this reason,
Power outage time can be reduced. Further, by setting the ground fault current operation value to be equal to or less than the operation value of the relay in the substation, the defective arrester element 1 can be separated and displayed without power failure.

In the display state, the red display body 13 falls below the state of FIG. 1 as shown in FIG. This drop is based on the downward biasing force of the spring 15 when the electrode rod 9 comes off the plunger 8. When the display body 13 falls downward, a display window (not shown) provided at that position.
The red display can be visually recognized from. Display body guide 1
Since 4 is applied in white, the color changes from white to red.

[0013]

As described above, according to the arrester disconnecting device of the present invention, the plunger is used as the first member of the ground circuit, the second member constituting the ground circuit is hooked on the plunger, and the solenoid is operated by the ground fault current. When the plunger is moved by the operation of the second member, the second member is disengaged from the plunger to cut off the ground circuit, so that it is not necessary to provide a plunger mechanism and a separation mechanism independent of the ground circuit, and as a result, the configuration is simplified In addition, the size can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a closed state of a ground circuit according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a cutoff state of a ground circuit according to one embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a relationship between a plunger and an electrode rod according to one embodiment of the present invention.

FIG. 4 is an explanatory view and an exploded view showing a relationship between a display body and a display body guide according to one embodiment of the present invention.

FIG. 5 is an explanatory diagram showing an electric circuit configuration corresponding to FIGS. 1 and 2;

[Explanation of symbols]

1 Arrester element 2
Electrode 3 Electrode table 4
Spring 5 Insulating substrate 6
Yoke 7 (7A, 7B) Solenoid 8
Plunger 9 electrode rod 10
Spring 11 Housing 13
Display body 14 Display body guide 15
spring

──────────────────────────────────────────────────続 き Continued on front page (72) Inventor Yoshimo Kamiya 5-2-1, Ebara, Shinagawa-ku, Tokyo Inside Saneisha Manufacturing Co., Ltd. (72) Inventor Kiyoshi Idogawa 5-2-1 Ebara, Shinagawa-ku, Tokyo (56) References JP-A-2-158076 (JP, A) JP-A 52-127232 (JP, U) JP-A 1-174890 (JP, U) -15361 (JP, B2) Jikken 58-38768 (JP, Y2) Jikken 43-17010 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01T 1/12 H01T 1/14 H01T 4/02 H01T 15/00 H01C 7/12

Claims (2)

(57) [Claims] 1. A solenoid provided in series with the arrester element on the ground side of the arrester element, and a protruding and attracting movement is forcibly performed by energizing and de-energizing the solenoid, and the solenoid is electrically connected to the arrestor element. Takes a first state mechanically hooked on the plunger, and a second state unhooked by the movement of the plunger, in the first state, An electrode rod electrically connected in series with the solenoid, an urging means for urging the electrode rod downward, and a display body for displaying the second state, wherein a ground fault is caused by deterioration of the arrester element. When a current flows, the solenoid is energized, the plunger moves, and the electrode rod is detached from the plunger to take a second state, and the energizing means is brought into the second state. An arrestor separating device, wherein a certain electrode bar is moved downward and the display body displays the second state. 2. The arrester disconnecting device according to claim 1, wherein said solenoid has a discharge gap in parallel.