Integrated lightning arrester with fuse for switch handcart

Abstract

The utility model provides an integrated lightning arrester with a fuse for a switch handcart, which is mainly used for solving the problems that the installation distance between the lightning arrester and the fuse in the existing switch handcart is too close, the potential safety hazard of discharging exists between the high-voltage end of the lightning arrester and a lower contact arm after the fuse is disconnected, and the fuse and the lightning arrester are respectively installed in the switch handcart, so that the potential safety hazard of discharging exists between the high-voltage end of the lightning arrester and the lower contact arm. And the installation, the disassembly and the replacement are not convenient enough. The device comprises a fuse and a lightning arrester which are arranged in a shell, a gap is kept between the fuse and the lightning arrester in space, and first isolation is carried out; the shell is internally filled with the insulating material, the fuse and the lightning arrester are subjected to double isolation by the insulating material, and when the fuse is fused, the insulating material plays a good insulating role, so that the voltage cannot be transmitted to the lower wiring terminal from the lightning arrester, and the hidden danger of discharge is reduced.

Description

Technical Field

[0001] The utility model relates to a lightning arrester, in particular to an integrated lightning arrester for a switch trolley with a fuse. Background Art

[0002] A lightning arrester is a device for limiting overvoltage in a power system, and a fuse is a device for limiting overcurrent. Both are widely used in switch trolleys. A switch trolley is a movable electrical equipment component, commonly used in high-voltage switch cabinets. When the switch trolley is disconnected, it can be manually pulled out of the switch cabinet after laying the guide rails for maintenance or replacement.

[0003] As Figure 1 shown, it is a common connection method of a lightning arrester and a fuse in an existing switch trolley. The high-voltage end of the lightning arrester 04 is near the lower contact arm 02 of the switch trolley and is connected to the upper contact arm 01 of the switch trolley. The fuse 03 is connected between the upper contact arm 01 and the lower contact arm 02 of the switch trolley. It has the following two deficiencies: First, when the circuit current of the switch trolley is overloaded, the fuse 03 is disconnected. Since the safety distance between the high-voltage end of the lightning arrester 04 and the lower contact arm 02 is too small and they are almost in contact at this time, it is easy to cause discharge between the high-voltage end of the lightning arrester 04 and the lower contact arm 02, affecting the normal operation of the switch cabinet; Second, the fuse 03 and the lightning arrester 04 are installed in the switch trolley separately, resulting in inconvenient installation, disassembly and replacement. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the technical problems that the installation distance between the lightning arrester and the fuse in the existing switch trolley is too close, there is a discharge safety hazard between the high-voltage end of the lightning arrester and the lower contact arm after the fuse is disconnected, and the fuse and the lightning arrester are installed in the switch trolley separately, resulting in inconvenient installation, disassembly and replacement, and to propose an integrated lightning arrester for a switch trolley with a fuse.

[0005] To solve the above technical problems, the technical solution provided by the utility model is as follows:

[0006] An integrated lightning arrester for a switch trolley with a fuse, characterized in that it includes a housing, an upper terminal, a lower terminal installed on the housing, and a lightning arrester and a fuse arranged inside the housing;

[0007] The lightning arrester is installed near one inner wall of the housing and includes an upper electrode, a lower electrode, and a voltage-limiting element located between the upper electrode and the lower electrode;

[0008] One end of the upper terminal is arranged outside the housing for electrically connecting with the equipment on the switch trolley, and the other end is arranged inside the housing and is connected to the upper electrode and one end of the fuse;

[0009] One end of the lower terminal is arranged outside the housing and is used for electrically connecting with the equipment on the switch trolley, and the other end is arranged inside the housing and is connected with the other end of the fuse;

[0010] The fuse is installed near the inner wall on the other side of the housing, and there is a gap between it and the arrester, and the gap is filled with insulating material;

[0011] One end of the upper electrode and the fuse is located at the upper end inside the housing; the other end of the fuse is located in the middle or at the lower end inside the housing; the lower electrode is installed at the lower end inside the housing, and a grounding interface is arranged at its lower end.

[0012] Further, the voltage-limiting element is a plurality of series-connected resistor chips. The resistor chip at the upper end is connected with the upper electrode, and the resistor chip at the lower end is connected with the lower electrode.

[0013] Further, the housing includes an upper housing and a lower housing, and the width of the upper housing is greater than the width of the lower housing;

[0014] The fuse is installed near the inner wall on one side of the upper housing; the upper part of the voltage-limiting element is installed near the inner wall on the other side of the upper housing and there is a gap between it and the fuse, and the lower part is located inside the lower housing; the insulating material is located inside the upper housing and fills the gap between the arrester and the fuse.

[0015] Further, the upper terminal is arranged at the upper end of the upper housing, and the lower terminal is arranged at the lower end of the upper housing; the length of the fuse is adapted to the upper housing.

[0016] Further, the upper electrode is installed at the upper end of the upper housing, and the lower electrode is located at the bottom end of the lower housing.

[0017] Further, the width of the lower housing is adapted to the width of the voltage-limiting element.

[0018] The present utility model also provides another integrated arrester with a fuse for a switch trolley, which is characterized in that: it includes a housing, an upper terminal, a lower terminal installed on the housing, and a fuse, an arrester, an upper electrode and a conductive rod arranged inside the housing;

[0019] The housing includes an upper housing and a lower housing, and the width of the upper housing is greater than the width of the lower housing;

[0020] The upper terminal is installed at the upper end of the upper housing. One end of the upper terminal is arranged outside the upper housing and is used for electrically connecting with the equipment on the switch trolley, and the other end is arranged inside the upper housing and is connected with one end of the upper electrode and the fuse;

[0021] The lower terminal is installed at the lower end of the upper housing. One end of the lower terminal is disposed outside the upper housing for electrically connecting to the equipment on the switch trolley, and the other end is disposed inside the upper housing and connected to the other end of the fuse.

[0022] The length of the fuse is adapted to the upper housing and is installed close to one inner wall of the upper housing.

[0023] The lightning arrester includes an eccentric electrode, a lower electrode, and a voltage-limiting element connected between the eccentric electrode and the lower electrode; the eccentric electrode is installed at the upper end of the lower housing, the lower electrode is installed at the bottom end of the lower housing, and a grounding interface is provided at its lower end.

[0024] One end of the conductive rod is connected to the upper electrode, and the other end is connected to the eccentric electrode; the conductive rod is installed close to the other inner wall of the upper housing, and there is a gap between the conductive rod and the fuse, and the gap is filled with an insulating material.

[0025] Further, the voltage-limiting element is a plurality of series-connected resistor plates. The resistor plate at the upper end is connected to the eccentric electrode, and the resistor plate at the lower end is connected to the lower electrode.

[0026] Further, the width of the lower housing is adapted to the voltage-limiting element.

[0027] Advantages of the present utility model:

[0028] 1. The present utility model includes a fuse and a lightning arrester disposed in the housing, keeping a gap between the two spatially for the first isolation; an insulating material is filled inside the housing, and the insulating material isolates the fuse and the lightning arrester for the second isolation. When the fuse melts, the insulating material plays a good insulating role, preventing the voltage from being transmitted to the lower terminal and reducing the discharge hazard.

[0029] 2. In the present utility model, the high-voltage end of the lightning arrester, i.e., the upper electrode, is located at the upper end of the upper housing, and the lower terminal is located at the lower end of the upper housing; or an eccentric electrode is used to isolate the upper end of the lightning arrester from the lower terminal, avoiding discharge between the high-voltage end of the lightning arrester and the lower terminal.

[0030] 3. The lightning arrester and the fuse in the present utility model are of an integrated structure and are integrally installed inside the housing. The installation process when installing the lightning arrester and the fuse on the switch trolley is simplified, the operation difficulty is reduced, and convenient installation and use can be achieved. Description of the Drawings

[0031] Figure 1 It is a schematic connection structure diagram of a common fuse and a lightning arrester in an existing switch trolley.

[0032] Figure 1Description of the reference numerals in the drawings: 01, upper contact arm; 02, lower contact arm; 03, fuse; 04, lightning arrester;

[0033] Figure 2 FIG. 4 is a schematic structural diagram of the first embodiment of the integrated lightning arrester with a fuse for a switch trolley of the present invention;

[0034] Figure 3 FIG. 8 is a schematic structural diagram of the second embodiment of the integrated lightning arrester with a fuse for a switch trolley of the present invention.

[0035] Description of the reference numerals:

[0036] 1, housing; 2, upper terminal; 3, lower terminal; 4, fuse; 5, voltage-limiting element; 6, upper electrode; 7, lower electrode; 8, insulating material; 9, conductive rod; 10, eccentric electrode. Detailed implementation manners

[0037] The present invention will be further described below in conjunction with the drawings and embodiments.

[0038] Embodiment 1. The present invention provides an integrated lightning arrester with a fuse for a switch trolley. As Figure 2 shown, it includes a housing 1, an upper terminal 2 and a lower terminal 3 installed on the housing 1, and a fuse 4 and a lightning arrester disposed inside the housing 1. The inside of the housing 1 is filled with an insulating material 8.

[0039] The housing 1 has a structure that is wider at the top and narrower at the bottom, including a wider upper housing and a narrower lower housing.

[0040] The lightning arrester includes an upper electrode 6, a lower electrode 7, and a voltage-limiting element 5 connected between the upper electrode 6 and the lower electrode 7. The upper electrode 6 is located at the upper end inside the upper housing, and the lower electrode 7 is installed at the lower end inside the lower housing, and a grounding interface is provided at its lower end. The voltage-limiting element 5 includes a plurality of series-connected resistor chips. The resistor chips at both ends are respectively connected to the upper electrode 6 and the lower electrode 7. The upper part of the voltage-limiting element 5 is installed close to the inner wall of one side of the upper housing, and the lower part is installed in the lower housing, and the lower part of the voltage-limiting element 5 is adapted to the width of the lower housing. The upper part of the voltage-limiting element 5 is disposed opposite to the fuse 4, and there is a gap between the two, playing a first-layer isolation role. The opposite setting makes the gap between the fuse 4 and the lightning arrester the largest, optimizing the isolation effect.

[0041] Under normal working voltage, the lightning arrester is in a high-resistance state and hardly conducts current. When overvoltage or switching overvoltage occurs, the resistance values of the plurality of resistor chips of the voltage-limiting element rapidly decrease, and the current input through the upper terminal 2 flows through the upper electrode 6 and the plurality of series-connected resistor chips respectively, and finally is output by the lower electrode 7, thereby introducing the overvoltage into the ground and achieving the protection effect.

[0042] The upper terminal 2 is installed at the upper end of the upper housing. One end of the upper terminal 2 is disposed outside the upper housing for electrically connecting with the equipment on the switch trolley; the other end is disposed inside the upper housing and is connected to one end of the upper electrode 6 and the fuse 4; the external current is input through the upper terminal 2 and transmitted to the fuse 4.

[0043] The lower terminal 3 is installed at the lower end of the upper housing. One end of the lower terminal 3 is disposed outside the upper housing for electrically connecting with the equipment on the switch trolley; the other end is disposed inside the upper housing and is connected to the other end of the fuse 4.

[0044] One end of the fuse 4 is located at the upper end inside the upper housing; the other end of the fuse 4 is located at the lower end inside the upper housing; the fuse 4 is installed close to the inner wall on the other side of the upper housing, and the current on the fuse 4 is output through the lower terminal 3. When the current passing through the fuse 4 exceeds its rated value to a certain extent and lasts for a period of time, the fuse element in the fuse 4 melts due to heat, thereby disconnecting the circuit through which the current flows and playing a protective role.

[0045] The upper housing is filled with an insulating material 8. The insulating material 8 provides a double isolation for the fuse 4 and the lightning arrester. When the fuse 4 melts, the insulating material 8 plays a good insulating role, preventing the voltage from being transmitted to the lower terminal 3 and reducing the risk of discharge.

[0046] Embodiment 2. The present invention provides another integrated lightning arrester with a fuse for a switch trolley, as Figure 3 shown, including a housing 1, an upper terminal 2, a lower terminal 3 installed on the housing 1, and a fuse 4, a lightning arrester, an upper electrode 6 and a conductive rod 9 disposed inside the housing 1;

[0047] The housing 1 includes an upper housing and a lower housing, and the width of the upper housing is greater than the width of the lower housing;

[0048] The lightning arrester includes an eccentric electrode 10, a lower electrode 7, and a voltage-limiting element connected between the eccentric electrode 10 and the lower electrode 7.

[0049] The upper terminal 2 is installed at the upper end of the upper housing. One end of the upper terminal 2 is disposed outside the upper housing for electrically connecting with the equipment on the switch trolley, and the other end is disposed inside the upper housing and is connected to one end of the upper electrode 6 and the fuse 4; the lower terminal 3 is installed at the lower end of the upper housing. One end of the lower terminal 3 is disposed outside the upper housing for electrically connecting with the equipment on the switch trolley, and the other end is disposed inside the upper housing and is connected to the other end of the fuse 4;

[0050] The length of the fuse 4 is adapted to the upper housing and is installed close to the inner wall on one side of the upper housing;

[0051] The upper electrode 6 is located at the upper end inside the upper housing. One end of the conductive rod 9 is connected to the upper electrode 6, and the other end is connected to the eccentric electrode 10. The conductive rod 9 is installed close to the inner wall on the other side of the upper housing. There is a gap between the conductive rod 9 and the fuse 4, and the gap is filled with an insulating material 8.

[0052] The lightning arrester is installed inside the lower housing, and the width of the lower housing is adapted to the lightning arrester. The eccentric electrode 10 is installed at the upper end of the lower housing, and the lower electrode 7 is installed at the bottom end of the lower housing, and a grounding interface is provided at its lower end. The voltage-limiting element 5 includes a plurality of series-connected resistor plates. The resistor plate at the upper end is connected to the eccentric electrode 10, and the resistor plate at the lower end is connected to the lower electrode 7. The eccentric electrode 10 isolates the distance between the resistor plates and the fuse 4, further improving the safety performance.

[0053] The lightning arrester of the present utility model and the fuse 4 are of an integral structure and are installed inside the housing 1. The installation process of the integral lightning arrester when installed on the switch trolley is simplified, the operation difficulty is reduced, and convenient installation and use can be achieved.

Claims

1. An integrated lightning arrester for a switch handcart with a fuse, characterized in that: It includes a housing (1), an upper terminal (2) mounted on the housing (1), a lower terminal (3), and a lightning arrester and a fuse (4) disposed inside the housing (1); The lightning arrester is mounted near one inner wall of the housing (1), and includes an upper electrode (6), a lower electrode (7), and a voltage-limiting element (5) located between the upper electrode (6) and the lower electrode (7); One end of the upper terminal (2) is disposed outside the housing (1) for electrically connecting to the equipment on the switch trolley, and the other end is disposed inside the housing (1) and connected to one end of the upper electrode (6) and the fuse (4); One end of the lower terminal (3) is disposed outside the housing (1) for electrically connecting to the equipment on the switch trolley, and the other end is disposed inside the housing (1) and connected to the other end of the fuse (4); The fuse (4) is mounted near the other inner wall of the housing (1), and there is a gap between it and the lightning arrester, and the gap is filled with an insulating material (8); One end of the upper electrode (6) and the fuse (4) is located at the upper end inside the housing (1); the other end of the fuse (4) is located in the middle or at the lower end inside the housing (1); the lower electrode (7) is mounted at the lower end inside the housing (1), and a grounding interface is provided at its lower end.

2. The integrated lightning arrester with a fuse for a switch trolley according to claim 1, characterized in that: The voltage-limiting element (5) is a plurality of series-connected resistor chips, the resistor chip at the upper end is connected to the upper electrode (6), and the resistor chip at the lower end is connected to the lower electrode (7).

3. The integrated lightning arrester with a fuse for a switch trolley according to claim 1 or 2, characterized in that: The housing (1) includes an upper housing and a lower housing, and the width of the upper housing is greater than the width of the lower housing; The fuse (4) is mounted near one inner wall of the upper housing; the upper part of the voltage-limiting element (5) is mounted near the other inner wall of the upper housing and there is a gap between it and the fuse (4), and the lower part is located inside the lower housing; the insulating material (8) is located inside the upper housing and fills the gap between the lightning arrester and the fuse (4).

4. The integrated lightning arrester with a fuse for a switch trolley according to claim 3, characterized in that: The upper terminal (2) is provided at the upper end of the upper housing, and the lower terminal (3) is provided at the lower end of the upper housing; the length of the fuse (4) is adapted to the upper housing.

5. The integrated lightning arrester with a fuse for a switch trolley according to claim 4, characterized in that: The upper electrode (6) is mounted at the upper end of the upper housing, and the lower electrode (7) is located at the bottom end of the lower housing.

6. The integrated lightning arrester with a fuse for a switch trolley according to claim 5, characterized in that: The width of the lower housing is adapted to the width of the voltage-limiting element (5).

7. An integrated lightning arrester for a switch trolley with a fuse, characterized in that: It includes a housing (1), an upper terminal (2) mounted on the housing (1), a lower terminal (3), and a fuse (4), a lightning arrester, an upper electrode (6) and a conductive rod (9) disposed inside the housing (1); The housing (1) includes an upper housing and a lower housing, and the width of the upper housing is greater than that of the lower housing; The upper terminal (2) is installed at the upper end of the upper housing. One end of the upper terminal (2) is arranged outside the upper housing for electrically connecting with the equipment on the switch trolley, and the other end is arranged inside the upper housing and is connected to one end of the upper electrode (6) and the fuse (4); The lower terminal (3) is installed at the lower end of the upper housing. One end of the lower terminal (3) is arranged outside the upper housing for electrically connecting with the equipment on the switch trolley, and the other end is arranged inside the upper housing and is connected to the other end of the fuse (4); The length of the fuse (4) is adapted to the upper housing and is installed close to one inner wall of the upper housing; The lightning arrester includes an eccentric electrode (10), a lower electrode (7), and a voltage-limiting element (5) connected between the eccentric electrode (10) and the lower electrode (7); the eccentric electrode (10) is installed at the upper end of the lower housing, and the lower electrode (7) is installed at the bottom end of the lower housing, and a grounding interface is arranged at its lower end; One end of the conductive rod (9) is connected to the upper electrode (6), and the other end is connected to the eccentric electrode (10); the conductive rod (9) is installed close to the other inner wall of the upper housing, and there is a gap between the conductive rod (9) and the fuse (4), and the gap is filled with an insulating material (8).

8. The integrated lightning arrester with a fuse for a switch trolley according to claim 7, characterized in that: The voltage-limiting element (5) is a plurality of series-connected resistor plates. The resistor plate at the upper end is connected to the eccentric electrode (10), and the resistor plate at the lower end is connected to the lower electrode (7).

9. The integrated lightning arrester with a fuse for a switch trolley according to claim 8, characterized in that: The width of the lower housing is adapted to the voltage-limiting element (5).

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