Power system protection device

Abstract

The utility model provides an electric power system protection device. A ceramic seat is fixedly arranged at the front part in a shell, a front lead passes through an open hole in the center of the ceramic seat, a front spring is arranged on the outer side of the rear part of the ceramic seat, the rear end of the front lead is fixedly connected with a fixed electrode, a sliding electrode is arranged behind the fixed electrode, and the front end of the sliding electrode is connected with the front spring; the rear portion of the sliding electrode is connected with the front end of a rear spring, the rear end of the rear spring is fixedly connected with a sliding plate, heat-sensitive materials are arranged between the sliding plate and the bottom plate, and the front end of a rear lead is connected with the center of the bottom plate. A triggering rod is arranged on the sliding plate and penetrates through the bottom plate to be inserted into the trigger, a movable electrode plate is arranged at the front end of the triggering rod, a fixed electrode plate is arranged in the trigger, and the movable electrode plate and the fixed electrode plate are in contact to conduct a warning circuit. When a large current passes through the protection device, the heat-sensitive material is melted, the front spring enables the sliding electrode to be separated from the fixed electrode, and the sliding electrode moves backwards to drive the percussion rod to enable the warning circuit to be conducted, so that the fusing of the fuse can be quickly found.

Description

Technical Field

[0001] The utility model relates to the field of power system protection, in particular to a power system protection device. Background Art

[0002] In the power system, the distribution box is an important power distribution unit, which is used to distribute electric energy from the main line to each branch to meet the needs of different electrical equipment. Since various faults such as overload, short circuit, leakage, etc. may occur during the transmission and distribution of current, the distribution box must be equipped with corresponding protection devices to ensure the safe operation of the power system and the safety of personnel.

[0003] Fuses are important components for short-circuit protection. They can quickly cut off high-current short-circuit faults to prevent electrical fires and equipment damage. Existing fuses do not send a blown signal immediately after they blow. During inspection and maintenance, they need to be checked one by one, affecting disposal efficiency. Utility Model Content

[0004] The utility model proposes a power system protection device based on the above technical problems.

[0005] A power system protection device comprises: a shell, a front lead, a rear lead, a sliding electrode, a thermosensitive material, and a trigger, wherein the shell is made of a conductive metal material, a resin cover is provided at the front end of the shell, and a conductive bottom plate is provided at the rear end; a ceramic seat is fixedly provided at the front part of the shell, a hole is opened in the center of the ceramic seat, the front lead passes through the hole in the center of the ceramic seat, the rear part of the ceramic seat is cylindrical, a front spring is provided at the outer side of the rear part of the ceramic seat, a fixed electrode is fixedly connected to the rear end of the front lead, a sliding electrode is provided behind the fixed electrode, the sliding electrode is in sliding contact with the inner wall of the shell, and the front end of the sliding electrode is connected to the front spring; the rear part of the sliding electrode is connected to the front end of the rear spring, the rear end of the rear spring is connected and fixed to a slide plate, the thermosensitive material is provided between the slide plate and the bottom plate, and the front end of the rear lead is connected to the center of the bottom plate; a firing rod is provided on the slide plate, the firing rod passes through the bottom plate and is inserted into the trigger, a movable electrode sheet is provided at the front end of the firing rod, a fixed electrode sheet is provided in the trigger, and the movable electrode sheet and the fixed electrode sheet are in contact to conduct a warning circuit.

[0006] Preferably, the front portion of the sliding electrode is grooved, the front spring is clamped in the front groove of the sliding electrode, and the front spring does not contact the fixed electrode.

[0007] Preferably, the slide plate and the firing rod are both made of high temperature resistant insulating materials.

[0008] Beneficial effect: When a large current passes through the protection device, the heat-sensitive material melts, and the front spring pushes the sliding electrode open to separate the sliding electrode from the fixed electrode, disconnecting the line. The sliding electrode moves backward, which drives the firing rod to move backward to turn on the warning circuit, thereby quickly discovering that the fuse is blown, and locating the blown fuse in time, thereby improving the maintenance efficiency of the power supply line. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 The structure diagram of the utility model is shown;

[0010] Figure 2 Shows a cross-sectional structural diagram of the utility model;

[0011] Figure 3 A partial enlarged view of the utility model is shown. DETAILED DESCRIPTION

[0012] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0013] like Figure 1~Figure 3 The power system protection device shown in the figure includes: a shell 1, a front lead 4, a rear lead 5, a sliding electrode 9, a thermosensitive material 12, and a trigger 14. The shell 1 is made of a conductive metal material. A resin cover 2 is provided at the front end of the shell 1, and a conductive bottom plate 3 is provided at the rear end thereof. A ceramic seat 6 is fixedly provided at the front portion of the shell 1. The ceramic seat 6 has a central opening. The front lead 4 penetrates from the resin cover 2 and passes through the central opening of the ceramic seat 6. A fixed electrode 8 is fixedly provided at the rear end of the front lead 4. The ceramic seat 6 is fixed in the shell 1. The rear part of the ceramic seat 6 is cylindrical, the front spring 7 is sleeved on the cylinder behind the ceramic seat 6, the front spring 7 is in a compressed state, the two ends of the front spring 7 are respectively fixed on the ceramic seat 6 and the sliding electrode 9, the sliding electrode 9 is arranged behind the fixed electrode 8, under normal conditions, the fixed electrode 8 is in contact with the sliding electrode 9, and the side wall of the sliding electrode 9 is in contact with the outer shell 1, the bottom plate 3 at the rear end of the outer shell 1 is connected to the rear lead 5, so under normal conditions, the current is conducted through the front lead 4, the fixed electrode 8, the sliding electrode 9, the outer shell 1 and the rear lead 5.

[0014] The rear part of the sliding electrode 9 is connected to the front end of the rear spring 10, and the rear end of the rear spring 10 is connected and fixed to the slide plate 11. A thermosensitive material 12 is provided between the slide plate 11 and the bottom plate 3. When the current is too large, the thermosensitive material 12 melts, and the support for the slide plate 11 disappears. The front spring 7 and the rear spring 10 extend at the same time, and the front spring 7 can push the sliding electrode 9 to move backward, and the rear spring 10 will also push the slide plate 11 to move backward; a firing rod 13 is provided on the rear side of the slide plate 11, and the rear end of the firing rod 13 passes through the bottom plate 3 and is inserted into the trigger 14. A top plate 16 is provided at the front end of the firing rod 13, and a movable electrode sheet 17 is fixedly provided on the top plate 16. It is non-conductive, and a fixed electrode sheet 15 is provided in the trigger 14. A small spring 18 is provided between the top plate 16 and the bottom of the trigger. The small spring 18 is sleeved on the outside of the movable electrode sheet 17 and the fixed electrode sheet 15. The small spring 18 can play a buffering role, but will not prevent the firing rod 13 from moving backward. The firing rod 13 moves backward, which can make the movable electrode sheet 17 and the fixed electrode sheet 15 contact and turn on the warning circuit 19. A signal transmitter or a warning light can be set on the warning circuit 19. The signal transmitter can send a signal to the control center, indicating that the fuse has blown; the warning light can be set on the distribution box as a marking signal of the fuse.

[0015] The slide plate 11 and the firing rod 13 are both made of high temperature resistant insulating materials.

[0016] In order to ensure the connection between the sliding electrode 9 and the front spring 7 and the contact surface between the sliding electrode 9 and the inner wall of the housing 1, the sliding electrode 9 is grooved in the front, and the front spring 7 is stuck in the front groove of the sliding electrode 9, and the front spring 7 does not contact the fixed electrode 8.

[0017] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A power system protection device, characterized in that: include: A shell, a front lead, a rear lead, a sliding electrode, a thermosensitive material, and a trigger. The shell is made of a conductive metal material, a resin cover is provided at the front end of the shell, and a conductive bottom plate is provided at the rear end. A ceramic seat is fixedly provided at the front part of the shell, a hole is opened in the center of the ceramic seat, the front lead passes through the hole in the center of the ceramic seat, the rear part of the ceramic seat is cylindrical, a front spring is provided at the outer side of the rear end of the ceramic seat, a fixed electrode is fixedly connected to the rear end of the front lead, a sliding electrode is provided behind the fixed electrode, the sliding electrode is in sliding contact with the inner wall of the shell, and the front end of the sliding electrode is connected to the front spring; the rear end of the sliding electrode is connected to the front end of the rear spring, the rear end of the rear spring is connected and fixed to a slide plate, the thermosensitive material is provided between the slide plate and the bottom plate, and the front end of the rear lead is connected to the center of the bottom plate; a firing rod is provided on the slide plate, the firing rod passes through the bottom plate and is inserted into the trigger, a movable electrode sheet is provided at the front end of the firing rod, a fixed electrode sheet is provided in the trigger, and the contact between the movable electrode sheet and the fixed electrode sheet can conduct the warning circuit.

2. The power system protection device according to claim 1, characterized in that: The front portion of the sliding electrode is grooved, the front spring is clamped in the front groove of the sliding electrode, and the front spring does not contact the fixed electrode.

3. The power system protection device according to claim 1, characterized in that: The slide plate and the firing rod are both made of high temperature resistant insulating materials.

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