Residual current monitoring device of low-voltage alternating current system

Abstract

The utility model discloses a residual current monitoring device for a low-voltage AC system, and belongs to the technical field of residual current monitoring. A low-voltage alternating current system residual current monitoring device comprises a monitoring host, a residual current acquisition module and an alternating current mutual inductor, a mounting seat body is arranged at the alternating current mutual inductor, and the mounting seat body comprises a base used for being connected with a mounting plate and a hoop used for being matched with the outer wall of the alternating current mutual inductor; the base is provided with two butt joint blocks arranged in the length direction of the base, and an adjusting area is formed between the two butt joint blocks. According to the mounting seat for the alternating current mutual inductor, the alternating current mutual inductor can be easily fixed on the mounting seat body without using a traditional bolt fastening mode through the matched arrangement of the clamp matched with the outer wall of the alternating current mutual inductor and the butt joint block, so that the mounting and dismounting processes are simplified, and the working efficiency is improved; the problem that the service life is affected due to the fact that the bolts are mounted on the mounting plate, mounting and dismounting are tedious and are frequently dismounted, and the bolts and the mounting plate are prone to slipping is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of residual current monitoring, in particular to a residual current monitoring device for a low-voltage AC system. Background Art

[0002] The substation low-voltage AC system supplies power to the primary and secondary equipment of the substation. It is an indispensable link to ensure reliable power supply of the substation. Abnormal conditions will directly affect the normal use of the running equipment. Therefore, it is very important to monitor the residual current of the station low-voltage AC system.

[0003] At present, the real-time residual current of each AC circuit in the station is monitored to determine whether the system has an insulation fault. The system consists of a monitoring host, a residual current acquisition module, and an AC transformer. The monitoring host obtains information and makes judgments at each line where the AC transformer is installed. The AC transformer is usually directly installed on the mounting plate with bolts. Each time it is inspected and repaired, the AC transformer needs to be removed from the mounting plate, which is rather cumbersome. At the same time, frequent disassembly of the structure fixed with bolts can easily cause thread slippage, affecting its service life. Utility Model Content

[0004] The utility model provides a low-voltage AC system residual current monitoring device, which can overcome certain defects of the prior art.

[0005] According to the utility model, a low-voltage AC system residual current monitoring device includes a monitoring host, a residual current acquisition module and an AC transformer. The AC transformer is provided with a mounting seat body, which includes a base for connecting to a mounting plate and a clamp for cooperating with the outer wall of the AC transformer;

[0006] The base is provided with two docking blocks arranged along the length direction of the base, and an adjustment area is formed between the two docking blocks;

[0007] The clamp has an opening along the axial direction of the AC transformer, and a clamping portion that cooperates with the adjustment area is formed on the inner wall of the opening;

[0008] An inserting hole is formed on the side wall of the clamping portion, and a locking component is slidably provided inside the two docking blocks. The locking component is used to cooperate with the inserting hole to limit the axial and circumferential directions of the clamp.

[0009] Preferably, an installation cavity for installing the locking assembly is formed inside the docking block, a positioning groove is formed at one end of the installation cavity close to the adjustment area, and a baffle is detachably provided at the end of the installation cavity away from the adjustment area, and a circular hole is formed on the baffle that is coaxial with the installation cavity.

[0010] Through the above structure, a removable baffle is set at one end of the installation cavity away from the adjustment area, and a circular hole coaxially arranged with the installation cavity is formed on the baffle, which facilitates the rapid removal of the baffle when needed to install, maintain or replace the locking assembly.

[0011] Preferably, the locking components inside the two docking blocks are symmetrically arranged along the adjustment area. The locking components include an adjustment member slidably arranged in the installation cavity. The adjustment member has a spline portion at one end passing through the positioning groove, and has a handle at one end passing through the circular hole. A spring is provided between the adjustment member and the installation cavity, and the spring is used to provide an elastic force to keep the adjustment member pressed toward the adjustment area.

[0012] Through the above structure, the clamp can be limited more stably, ensuring that the AC transformer in the clamp can be stably installed on the base.

[0013] Preferably, a first spline groove is formed on the inner wall of the plug-in hole, the first spline groove cooperates with the spline portion, and the first spline groove is used to limit the circumference of the locking assembly.

[0014] The above structure prevents the locking assembly from rotating circumferentially, thereby preventing the clamp from loosening due to automatic rotation after installation.

[0015] Preferably, a second spline groove is formed on the inner wall of the positioning groove, the second spline groove cooperates with the spline portion, and the second spline groove is used to cooperate with the first spline groove to form a circumferential limit for the clamp.

[0016] Through the above structure, the clamp, that is, the AC transformer, can be adjusted to different installation angles according to needs to adapt to different line installation requirements, thereby improving the applicability of the device.

[0017] Preferably, the locking components in the two docking blocks respectively have a docking rod and a docking part, and the docking rod and the docking part are respectively located at the end of the spline part corresponding to the adjustment area. The docking rod is formed by the inward depression of the corresponding spline part end, and a plug-in fit is formed between the docking rod and the docking part.

[0018] Through the above structure, the two locking components form a plug-in connection, thereby improving the connection strength between the two locking components and providing stable and reliable support for the clamp. At the same time, the coordinated setting of the docking rod and the docking part also plays a guiding role, thereby improving the docking efficiency of the two locking components.

[0019] Preferably, the side of the docking block away from the base is semicircular.

[0020] With the above structure, the AC transformer can be preferably rotated along the docking block.

[0021] The beneficial effects of the utility model are as follows:

[0022] The present invention discloses a low-voltage AC system residual current monitoring device, which can easily fix the AC transformer on the mounting base body through the cooperation of a clamp that cooperates with the outer wall of the AC transformer and two docking blocks at the base, without using the traditional bolt fastening method, simplifying the installation and disassembly process, improving work efficiency, and avoiding the tedious installation and disassembly of the mounting plate by bolts and frequent disassembly, which easily causes slippage between the bolts and the mounting plate and affects the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The figure is a schematic diagram of the overall structure of a residual current monitoring device for a low-voltage AC system.

[0024] Figure 2 This is a schematic diagram of the explosion structure of a residual current monitoring device for a low-voltage AC system.

[0025] Figure 3 The figure is a schematic diagram of the cross-sectional structure of a docking block of a residual current monitoring device for a low-voltage AC system.

[0026] Figure 4 The figure is a schematic diagram of the locking component structure of a residual current monitoring device for a low-voltage AC system. DETAILED DESCRIPTION

[0027] In order to further understand the content of the present invention, the present invention is described in detail with reference to the embodiments. It should be understood that the embodiments are merely for explanation of the present invention and are not intended to limit the present invention.

[0028] Example 1

[0029] See also Figure 1-4 This embodiment provides a low-voltage AC system residual current monitoring device, which includes a monitoring host, a residual current acquisition module, and an AC transformer 140. The AC transformer 140 is provided with a mounting base body 100. The mounting base body 100 includes a base 110 for connecting to a mounting plate and a clamp 150 for engaging with the outer wall of the AC transformer 140.

[0030] The base 110 is provided with two docking blocks 120 arranged along the length direction of the base 110 , and an adjustment area 130 is formed between the two docking blocks 120 ;

[0031] The clamp 150 has an opening along the axial direction of the AC transformer 140 , and a clamping portion 210 is formed on the inner wall of the opening to cooperate with the adjustment area 130 ;

[0032] An inserting hole 220 is formed on the side wall of the clamping portion 210. Locking components 160 are slidably provided inside the two docking blocks 120. The locking components 160 are used to cooperate with the inserting hole 220 to limit the clamp 150 in the axial and circumferential directions.

[0033] A low-voltage AC system residual current monitoring device disclosed herein can easily fix the AC transformer 140 on the mounting base body 100 through the cooperation of a clamp 150 that cooperates with the outer wall of the AC transformer 140 and two docking blocks 120 at the base 110, without using a traditional bolt fastening method, thereby simplifying the installation and disassembly process, improving work efficiency, and avoiding the cumbersome installation and disassembly of the mounting plate by bolts and frequent disassembly, which easily causes slippage between the bolts and the mounting plate and shortens the service life.

[0034] Seen in Figure 3 In this embodiment, an installation cavity 310 for installing the locking assembly 160 is formed inside the docking block 120, and a positioning groove 370 is formed at one end of the installation cavity 310 close to the adjustment area 130. A baffle is detachably provided at the end of the installation cavity 310 away from the adjustment area 130, and a circular hole is formed on the baffle that is coaxial with the installation cavity 310.

[0035] Through the above structure, a removable baffle is set at one end of the installation cavity 310 away from the adjustment area 130, and a circular hole coaxially arranged with the installation cavity 310 is formed on the baffle, so that the baffle can be quickly removed when needed to install, maintain or replace the locking assembly 160.

[0036] Seen in Figure 3 In this embodiment, the locking assemblies 160 inside the two docking blocks 120 are symmetrically arranged along the adjustment area 130. The locking assembly 160 includes an adjustment member 320 slidably arranged in the installation cavity 310. The adjustment member 320 has a spline portion 330 at one end passing through the positioning groove 370, and a handle 360 at one end passing through the circular hole. A spring 350 is provided between the adjustment member 320 and the installation cavity 310. The spring 350 is used to provide an elastic force to keep the adjustment member 320 pressed toward the adjustment area 130.

[0037] Through the above structure, the clamp 150 can be limited more stably, ensuring that the AC transformer 140 in the clamp 150 can be stably installed on the base 110.

[0038] It is understandable that the spring provides an elastic force for pressing the adjustment member 320 toward the adjustment area 130 , so that the locking assembly 160 can automatically maintain a locked state when not acted upon by external forces, thereby enhancing the reliability and stability of the locking.

[0039] Seen in Figure 3 In this embodiment, a first spline groove is formed on the inner wall of the plug-in hole 220 , and the first spline groove cooperates with the spline portion 330 . The first spline groove is used to limit the locking assembly 160 in the circumferential direction.

[0040] The above structure prevents the locking assembly 160 from rotating circumferentially, thereby preventing the clamp 150 from loosening due to automatic rotation after installation.

[0041] Seen in Figure 3 In this embodiment, a second spline groove is formed on the inner wall of the positioning groove 370, and the second spline groove cooperates with the spline portion 330. The second spline groove is used to cooperate with the first spline groove to form a circumferential limit for the clamp 150.

[0042] Through the above structure, the clamp 150, namely the AC transformer 140, can be adjusted to different installation angles according to needs to adapt to different line installation requirements, thereby improving the applicability of the device.

[0043] Seen in Figure 4 In this embodiment, the locking assembly 160 in the two docking blocks 120 respectively has a docking rod 340 and a docking part 410. The docking rod 340 and the docking part 410 are respectively located at the end of the spline part 330 corresponding to the adjustment area 130. The docking rod 340 is formed by the inward depression of the corresponding end of the spline part 330, and a plug-in fit is formed between the docking rod 340 and the docking part 410.

[0044] Through the above structure, the two locking components 160 form a plug-in connection, thereby improving the connection strength between the two locking components 160 and providing stable and reliable support for the clamp 150. At the same time, the matching setting of the docking rod 340 and the docking part 410 also plays a guiding role, thereby improving the docking efficiency of the two locking components 160.

[0045] Seen in Figure 1 and Figure 2 In this embodiment, the docking block 120 is semicircular on the side away from the base 110 .

[0046] Through the above structure, the AC transformer 140 can preferably rotate along the docking block 120 .

[0047] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application based on one or several embodiments provided in the present application to obtain other embodiments, and these embodiments do not exceed the scope of protection of the present application.

[0048] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The embodiments shown are only part of the embodiments of the present invention, and the actual structure is not limited to them. Therefore, if a person skilled in the art is inspired by the above and designs a structure and embodiment similar to the technical solution without creatively designing it without departing from the inventive purpose of the present invention, it shall fall within the scope of protection of the present invention.

Claims

1. A low-voltage AC system residual current monitoring device, comprising a monitoring host, a residual current acquisition module and an AC transformer (140), characterized in that: A mounting seat body (100) is provided at the AC mutual inductor (140), and the mounting seat body (100) includes a base (110) for connecting with the mounting plate and a clamp (150) for cooperating with the outer wall of the AC mutual inductor (140); The base (110) is provided with two docking blocks (120) arranged along the length direction of the base (110), and an adjustment area (130) is formed between the two docking blocks (120); The clamp (150) has an opening portion along the axial direction of the AC transformer (140), and a clamping portion (210) that cooperates with the adjustment area (130) is formed on the inner wall of the opening portion; A plug hole (220) is formed on the side wall of the clamping portion (210), and a locking assembly (160) is slidably provided inside the two docking blocks (120). The locking assembly (160) is used to cooperate with the plug hole (220) to limit the clamp (150) in the axial and circumferential directions.

2. The low-voltage AC system residual current monitoring device according to claim 1, characterized in that: An installation cavity (310) for installing the locking assembly (160) is formed inside the docking block (120), a positioning groove (370) is formed at one end of the installation cavity (310) close to the adjustment area (130), and a baffle is detachably provided at one end of the installation cavity (310) away from the adjustment area (130), and a circular hole is formed on the baffle and is coaxially arranged with the installation cavity (310).

3. The low-voltage AC system residual current monitoring device according to claim 2, characterized in that: The locking assembly (160) inside the two docking blocks (120) is symmetrically arranged along the adjustment area (130), and the locking assembly (160) includes an adjustment member (320) slidably arranged in the installation cavity (310), and the adjustment member (320) has a spline portion (330) at one end passing through the positioning groove (370), and a handle (360) at one end passing through the circular hole. A spring (350) is provided between the adjustment member (320) and the installation cavity (310), and the spring (350) is used to provide an elastic force to keep the adjustment member (320) pressed toward the adjustment area (130).

4. The low-voltage AC system residual current monitoring device according to claim 3, characterized in that: A first spline groove is formed on the inner wall of the plug-in hole (220), the first spline groove cooperates with the spline portion (330), and the first spline groove is used to limit the locking assembly (160) in the circumferential direction.

5. The low-voltage AC system residual current monitoring device according to claim 4, characterized in that: A second spline groove is formed on the inner wall of the positioning groove (370), the second spline groove cooperates with the spline portion (330), and the second spline groove is used to cooperate with the first spline groove to form a circumferential limit for the clamp (150).

6. The low-voltage AC system residual current monitoring device according to claim 1, characterized in that: The locking components (160) in the two docking blocks (120) respectively have a docking rod (340) and a docking portion (410). The docking rod (340) and the docking portion (410) are respectively located at the end of the spline portion (330) corresponding to the adjustment area (130). The docking rod (340) is formed by the end of the corresponding spline portion (330) being recessed inwardly, and a plug-in fit is formed between the docking rod (340) and the docking portion (410).

7. The low-voltage AC system residual current monitoring device according to claim 1, characterized in that: The side of the docking block (120) away from the base (110) is semicircular.

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