Relay protection device for transformer substation

Abstract

The relay protection device comprises a box body and an insulating synchronous rod, a U-shaped protection spring cavity is fixed in the box body, one end of the insulating synchronous rod penetrates through the U-shaped protection spring cavity and is connected with a supporting plate, a protection spring is arranged between the supporting plate and the U-shaped protection spring cavity, a clamping protrusion is fixed at the other end of the insulating synchronous rod, and the clamping protrusion is connected with the U-shaped protection spring cavity. The box body is provided with a high-temperature release assembly matched with the clamping protrusions. A plurality of movable conducting strips are fixed on the insulating synchronous rod, a first conducting rod and a second conducting rod which are matched with the movable conducting strips are arranged on the box body, and the other end of the first conducting rod and the other end of the second conducting rod are connected with a first connector lug and a second connector lug respectively. The two metal sheet protrusions of the high temperature release assembly can clamp the clamping protrusions from the two sides, the stress of the clamping protrusions of the insulation synchronous rod is more uniform when the clamping protrusions are clamped, the clamping protrusions cannot be released in advance, and triggering of the protection device is more reliable and sensitive at the high temperature.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of relay protection device, concretely relates to a relay protection device for transformer substation. BACKGROUND

[0002] The relay protection device is an automatic measure and equipment that can automatically, rapidly and selectively send warning signals or remove fault parts when power elements in the power system have faults or abnormal working conditions. The relay protection device is an important measure for detecting faults or abnormal conditions in the power system. Its basic task is to automatically remove the fault equipment from the system or send signals to eliminate the abnormal working condition source by the on-duty personnel in the shortest time and the smallest area when the power system has faults or abnormal working conditions, so as to reduce or avoid damage to the equipment and the impact on power supply to adjacent areas. The relay protection device is an indispensable important part of the power system, and it is of great significance to ensure the safe and stable operation of the power system

[0003] In the patent document CN208656398U, a relay protection device for transformer substation is disclosed. The device is provided with bimetallic strips with different thermal expansion properties. When deformed at high temperature, the locking buckle is pressed down to release the locking hook, thereby achieving power failure. Although this device can achieve power failure at high temperature, the deformation of the bimetallic strip occurs gradually, and the rotation of the locking buckle is a slow action. When the locking buckle is about to separate from the locking hook, the buckle connection will be offset or deformed due to the unilateral buckle connection, which may cause the locking buckle to separate prematurely, thereby causing the protection device to react not timely and sensitively. Therefore, it is necessary to provide a more reliable and sensitive relay protection device for transformer substation. SUMMARY

[0004] In view of the above shortcomings of the prior art, the utility model provides a more reliable and sensitive relay protection device for transformer substation.

[0005] To achieve the above-mentioned invention purposes, the utility model adopts the technical scheme that includes a box body and an insulating synchronous rod, a U-shaped protection spring cavity is fixed in the box body, a support plate is connected to one end of the insulating synchronous rod penetrating through the U-shaped protection spring cavity, a protection spring is arranged between the support plate and the U-shaped protection spring cavity, the protection spring is sleeved outside the insulating synchronous rod, a clamping protrusion is fixed to the other end of the insulating synchronous rod, and a high-temperature release assembly matched with the clamping protrusion is arranged on the box body; a plurality of moving conductive sheets are fixed to the insulating synchronous rod, a first conductive rod and a second conductive rod matched with the moving conductive sheets are arranged on the box body, the first conductive rod and the second conductive rod are connected through the moving conductive sheets, the other ends of the first conductive rod and the second conductive rod are respectively connected with a first connecting terminal and a second connecting terminal, and the first connecting terminal and the second connecting terminal are fixed on the box body.

[0006] Further, the high-temperature release assembly comprises a high-temperature release block in the shape of a square with a mouth, the high-temperature release block is provided with a clamping opening matched with the high-temperature release block, and the clamping opening is provided with a thermal bimetal sheet on each side.

[0007] Further, the metal sheet protrusion is provided with a chamfer on the side facing the clamping protrusion.

[0008] Further, the clamping protrusion is in the shape of a hemisphere or a circular truncated cone.

[0009] Further, the rear side of the high-temperature release block is provided with a rotating hole, the box body is fixed with a swing shaft matched with the rotating hole, and the box body is further fixed with two limiting columns matched with the rear side of the high-temperature release block.

[0010] Further, the box body is provided with a through hole matched with the reset button.

[0011] Further, the box body is fixed with a plurality of guide blocks, and the guide blocks are provided with guide holes matched with the insulating synchronous rod.

[0012] Further, the front side of the box body is provided with an opening, the opening is provided with a detachable box cover, and the box body and the box cover are connected by clamping or screws.

[0013] Further, when the clamping protrusion is clamped with the two metal sheet protrusions, the protection spring is in an energy storage state, and the movable conductive sheet is connected with the first conductive rod and the second conductive rod; after the clamping protrusion is separated from the two metal sheet protrusions, the protection spring is in a normal state, and the movable conductive sheet is disconnected from the first conductive rod and the second conductive rod.

[0014] Further, the movable conductive sheet, the first conductive rod, the second conductive rod, the first connecting terminal and the second connecting terminal are each provided with three.

[0015] The utility model discloses the beneficial effect is:

[0016] The utility model discloses the insulating synchronous rod drives movable conductive sheet to move, makes movable conductive sheet connect first conductive rod and second conductive rod, thereby realizes electric power operation. When the high temperature appears in the box body, the high-temperature release assembly can release the clamping end of the insulating synchronous rod in the first time, and the reset action of cooperation protection spring makes the insulating synchronous rod drive movable conductive sheet to move, makes movable conductive sheet disconnect with first conductive rod and second conductive rod, thereby when the high temperature appears in the box body, carries out power-off to electric power operation, guarantees the safety of electric power operation. When the high temperature in the box body is relieved, through the reset button drive insulating synchronous rod returns to the clamping position, makes clamping protrusion with two metal sheet protrusions clamped and fixed, thereby connects movable conductive sheet with first conductive rod, second conductive rod again, thereby restores electric power operation.

[0017] The utility model discloses the clamping projection of the insulation synchronous pole is fixed with the high temperature release subassembly, and the high temperature release subassembly includes high temperature release clamping block and two heat bimetals, is provided with the metal sheet projection on the heat bimetal, and two metal sheet projections can clamp the projection from both sides, and the stress of the clamping projection of the insulation synchronous pole is more uniform when clamping, so that the clamping projection does not appear in advance release, under high temperature, the triggering of protection device is more reliable and sensitive. In order to further guarantee the clamping force uniformity of the metal sheet projection on the heat bimetal, is provided with the swing axle on the rear side of high temperature release clamping block, so that high temperature release clamping block can swing in small range, so that the two heat bimetals on high temperature release clamping block can self -adaptation adjustment clamping force, so that the uniform clamping of the clamping projection is realized by the metal sheet projection, so that the triggering of protection device is more reliable and sensitive. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the whole structure schematic diagram of the utility model;

[0019] Figure 2 It is the structure schematic diagram of high temperature release clamping block and insulation synchronous pole;

[0020] Figure 3 It is the working principle diagram of high temperature release clamping block and insulation synchronous pole;

[0021] The symbol of each component is as follows:

[0022] 1, box body;2, first conducting rod;3, second conducting rod;4, first terminal;5, second terminal;6, moving conducting piece;7, insulation synchronous pole;71, clamping projection;8, reset button;9, U-shaped protection spring cavity;10, support plate;11, protection spring;12, guide block;13, high temperature release clamping block;14, heat bimetal;15, metal sheet projection;16, swing axle;17, limit post. DETAILED DESCRIPTION

[0023] The specific embodiment of the utility model is described below, so that the person skilled in the art can understand the utility model, but it should be clear that the utility model is not limited to the scope of the specific embodiment, for the ordinary skilled person in the art, as long as various changes are in the spirit and scope of the utility model defined and determined by the attached claims, these changes are obvious, and all the utility model creations using the utility model concept are protected.

[0024] For example, Figure 1As shown, the substation relay protection device includes a housing 1 and an insulated synchronizing rod 7. A U-shaped protective spring cavity 9 is fixed inside the housing 1. One end of the insulated synchronizing rod 7 passes through the U-shaped protective spring cavity 9 and is connected to a support plate 10. A protective spring 11 is installed between the support plate 10 and the U-shaped protective spring cavity 9, and the protective spring 11 is sleeved on the outside of the insulated synchronizing rod 7. A snap-fit ​​protrusion 71 is fixed to the other end of the insulated synchronizing rod 7. A high-temperature release assembly that cooperates with the snap-fit ​​protrusion 71 is installed on the housing 1. Several movable conductive plates 6 are fixed on the insulated synchronizing rod 7. A first conductive rod 2 and a second conductive rod 3 that cooperate with the movable conductive plates 6 are installed on the housing 1. The first conductive rod 2 and the second conductive rod 3 are connected by the movable conductive plates 6. The other ends of the first conductive rod 2 and the second conductive rod 3 are respectively connected to a first terminal 4 and a second terminal 5. The first terminal 4 and the second terminal 5 are fixed to the housing 1. The first terminal 4 and the second terminal 5 can be Kingtai's JT5 series copper busbar terminals or Vinal 01284 universal wire connection terminals. The insulating synchronizing rod 7 can be fitted with a plastic sleeve or an insulating ceramic sleeve for mounting and fixing the movable conductive plate 6. The movable conductive plate 6 has mounting holes for mounting the insulating synchronizing rod 7. In this embodiment, the movable conductive plate 6, the first conductive rod 2, the second conductive rod 3, the first terminal 4, and the second terminal 5 are all provided in three places, which can be used for three conductors and meet most power operation requirements.

[0025] The high-temperature release assembly includes a U-shaped high-temperature release latch 13. The high-temperature release latch 13 has a latching opening that mates with it. A bimetallic strip 14 is provided on both sides of the latching opening. Each bimetallic strip 14 has a metal protrusion 15 on the side facing the latching protrusion 71. A chamfer is provided on the side of the metal protrusion 15 facing the latching protrusion 71 to facilitate the insertion of the latching protrusion 71 between the two metal protrusions 15 to form a latch. The latching protrusion 71 is hemispherical or frustum-shaped, with its small end facing between the two latching protrusions 71. A 90° opening is formed on the left side of the latching protrusion 71 to facilitate latching with the two metal protrusions 71. Due to the different thermal expansion coefficients of the upper and lower layers, the bimetallic strip 14 bends downwards. The bimetallic strip 14 can be made of iron and copper, with the copper metal sheet located on the side facing the latching protrusion 71.

[0026] A rotating hole is provided on the rear side of the high-temperature release block 13. A swing shaft 16 that mates with the rotating hole is fixed on the housing 1. Two limiting posts 17 that mate with the rear side of the high-temperature release block 13 are also fixed on the housing 1. The high-temperature release block 13 can swing within a small range via the swing shaft 16 on the rear side. When the metal plate protrusions 15 on the two bimetallic strips 14 engage with the locking protrusions 71, the two bimetallic strips 14 can swing adaptively with the high-temperature release block 13. This allows the metal plate protrusions 15 on the two bimetallic strips 14 to engage with the locking protrusions 71 in a balanced manner, ensuring that the two metal plate protrusions 15 are sensitively triggered by the locking protrusions 71 during high-temperature release. A reset button 8 is fixed on the support plate 10, and a through hole is provided on the housing 1 to cooperate with the reset button 8. The insulated synchronous rod 7 can be easily moved and reset from the outside through the reset button 8. After high temperature contact inside the housing 1, the moving conductive plate 6 connects the first conductive rod 2 and the second conductive rod 3, thereby realizing the restoration of power operation.

[0027] Several guide blocks 12 are fixed on the housing 1, and each guide block 12 is provided with a guide hole that mates with the insulating synchronizing rod 7. Preferably, two guide blocks 12 are provided, and the two guide blocks 12 can provide support and guidance for the insulating synchronizing rod 7.

[0028] The front of the enclosure 1 has an opening with a removable cover. The enclosure 1 and the cover are connected by snap-fit ​​or screws. The removable design of the enclosure 1 and the cover makes the maintenance of the protective device more convenient.

[0029] When the snap-fit ​​protrusion 71 engages with the two metal protrusions 15, the protective spring 11 is in an energy-storing state, and the movable conductive plate 6 is connected to the first conductive rod 2 and the second conductive rod 3. After the snap-fit ​​protrusion 71 disengages from the two metal protrusions 15, and the protective spring 11 is in its normal state, the movable conductive plate 6 is disconnected from the first conductive rod 2 and the second conductive rod 3.

[0030] Working process and its principle: such as Figure 2 and 3As shown, in use, the first connector 4 and the second connector 5 are connected to the guide. Then, by pressing the reset button 8, the support plate 10 is moved. While the support plate 10 compresses the protective spring 11, it also moves the insulating synchronous rod 7, causing the moving conductive plate 6 to connect the first conductive rod 2 and the second conductive rod 3. The locking protrusion 71 of the insulating synchronous rod 7 is locked inside the high-temperature release assembly. Specifically, the locking protrusion 71 pushes open the two metal sheet protrusions 15, and the two locking protrusions 15 press the hot bimetallic strip 14 outward. After the locking protrusion 71 passes through the two metal sheet protrusions 15, the elasticity of the hot bimetallic strip 14 cooperates with the metal sheet protrusions 15 to lock the locking protrusion 71, thereby locking the position of the insulating synchronous rod 7 and the protective spring 11, so that the moving conductive plate 6 can be normally connected and operated with the first conductive rod 2 and the second conductive rod 3. When high temperatures occur inside the enclosure 1, the bimetallic strip 14 expands and bends outwards upon heating. The two bimetallic strips 14 cause the metal protrusions 15 to move outwards, disengaging them from the locking protrusions 71. After the insulating synchronizing rod 7 loses its locking position on the side of the locking protrusions 71, the protective spring 11 on the other side of the insulating synchronizing rod 7 releases its elasticity, causing the insulating synchronizing rod 7 to move. This disconnects the movable conductive piece 6 from the first conductive rod 2 and the second conductive rod 3, thus protecting the high-temperature circuit. Once the high temperature inside the enclosure 1 dissipates, pressing the reset button 8 again engages the locking protrusions 71 of the insulating synchronizing rod 7 with the metal protrusions 15 on the two bimetallic strips 14, restoring the substation relay protection device to its protective function.

Claims

1. A relay protection device for substations, characterized in that, The device includes a housing (1) and an insulating synchronous rod (7). A U-shaped protective spring cavity (9) is fixed inside the housing (1). One end of the insulating synchronous rod (7) passes through the U-shaped protective spring cavity (9) and is connected to a support plate (10). A protective spring (11) is provided between the support plate (10) and the U-shaped protective spring cavity (9). The protective spring (11) is sleeved on the outside of the insulating synchronous rod (7). A snap-fit ​​protrusion (71) is fixed at the other end of the insulating synchronous rod (7). A high-temperature release component that cooperates with the snap-fit ​​protrusion (71) is provided on the housing (1). A plurality of movable conductive plates (6) are fixed on the insulating synchronous rod (7). A first conductive rod (2) and a second conductive rod (3) that cooperate with the movable conductive plates (6) are provided on the housing (1). The first conductive rod (2) and the second conductive rod (3) are connected by the movable conductive plates (6). The other ends of the first conductive rod (2) and the second conductive rod (3) are respectively connected to a first terminal (4) and a second terminal (5). The first terminal (4) and the second terminal (5) are fixed on the housing (1).

2. The substation relay protection device according to claim 1, characterized in that, The high-temperature release component includes a U-shaped high-temperature release block (13), which has a snap-fit ​​opening that engages with the high-temperature release block (13). Both sides of the snap-fit ​​opening are provided with a thermal bimetallic strip (14), and each thermal bimetallic strip (14) has a metal strip protrusion (15) on the side facing the snap-fit ​​protrusion (71).

3. The substation relay protection device according to claim 2, characterized in that, The metal sheet protrusion (15) has a chamfer on the side facing the snap-fit ​​protrusion (71).

4. The substation relay protection device according to claim 2, characterized in that, The snap-fit ​​protrusion (71) is hemispherical or frustum-shaped.

5. The substation relay protection device according to claim 2, characterized in that, The high-temperature release block (13) has a rotating hole on its rear side, and a swing shaft (16) that cooperates with the rotating hole is fixed on the housing (1). The housing (1) also has two limiting posts (17) that cooperate with the rear side of the high-temperature release block (13).

6. The substation relay protection device according to claim 1, characterized in that, A reset button (8) is fixed on the support plate (10), and a through hole that cooperates with the reset button (8) is provided on the housing (1).

7. The substation relay protection device according to claim 1, characterized in that, A number of guide blocks (12) are fixed on the housing (1), and the guide blocks (12) are provided with guide holes that cooperate with the insulating synchronizing rod (7).

8. The substation relay protection device according to claim 1, characterized in that, The box body (1) has an opening on the front side, and a detachable box cover is provided on the opening. The box body (1) and the box cover are connected by snap-fit ​​or screws.

9. The substation relay protection device according to claim 1, characterized in that, When the snap-fit ​​protrusion (71) snaps into the two metal sheet protrusions (15), the protective spring (11) is in an energy storage state, and the movable conductive sheet (6) is connected to the first conductive rod (2) and the second conductive rod (3); after the snap-fit ​​protrusion (71) disengages from the two metal sheet protrusions (15), when the protective spring (11) is in its normal state, the movable conductive sheet (6) is disconnected from the first conductive rod (2) and the second conductive rod (3).

10. The substation relay protection device according to claim 1, characterized in that, The movable conductive sheet (6), the first conductive rod (2), the second conductive rod (3), the first connector (4), and the second connector (5) are all provided in three places.

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