Electrical cabinet capable of avoiding misoperation of 48V circuit breaker

Abstract

The utility model relates to an electrical cabinet capable of avoiding misoperation of a 48V circuit breaker, which comprises two relay groups arranged in a box body, one relay group is arranged in a closing loop, the other relay group is arranged in a tripping loop, each of the two relay groups comprises two relays which are connected in series, and the two relays are connected in parallel. And the two relays in each group are vertically arranged in the box body in the horizontal direction. According to the electrical cabinet, no matter the electrical cabinet is impacted along the front-back direction or the left-right direction of the cabinet body, at most one relay in each group is closed under the impact, a loop where the relays are located is still open, misoperation of a 48V circuit breaker cannot be caused, the closed circuit breaker does not have instantaneous large current, and a closing point is quickly separated, so that the safety of the electrical cabinet is ensured, and the service life of the electrical cabinet is prolonged. The relay is simple in structure and low in cost, keeps an initial state, not only solves the technical problem of misoperation of a 48V circuit breaker, but also has the cost which is only twice that of an original relay, is controllable in cost, and can be installed in a current small-sized gas-filled cabinet.

Description

Technical Field

[0001] The utility model belongs to the technical field of electrical equipment, and particularly relates to an electrical cabinet for avoiding misoperation of a 48V circuit breaker. Background Art

[0002] A circuit breaker is an important device in an electrical system. The closing circuit and tripping circuit of the circuit breaker are both connected to an electromagnetic relay. During use, it is found that for the same electromagnetic relay, the same installation method, and the same installation environment, the circuit breakers with specifications of 110V and 220V do not have misoperation, but the circuit breakers with a specification of 48V sometimes have misoperation.

[0003] After a large amount of research, numerous tests and analyses by technicians, the reason was finally found: in the case of a short-term contact closure in an impact environment, the closing and tripping coil resistances of the 110V and 220V circuit breakers are very large, the current is very small, and they can stably disconnect within 10ms after a short collision and closure. Generally, it takes 20ms for the 110V and 220V circuit breakers to operate. Therefore, there is no misoperation phenomenon for the 110V and 220V circuit breakers on site. For the 48V circuit breaker to ensure the same closing and tripping power as the 110V and 220V circuit breakers, it requires a very small resistance and a very large current. This means that even if the contact closes briefly for 1us, but the instantaneous current is too large, and the relay does not have enough energy to break. Only when the tripping is completed and the loop loses power can the contact separate. Therefore, the 48V circuit breaker has misoperation.

[0004] To solve the above problems, technicians have made a lot of efforts. For example, looking for electromagnetic relays with higher impact resistance, but the result is that the impact strength of all electromagnetic relays on the market is 10g (10 times the gravitational acceleration of 100m / s²), and no relay with higher specifications can be found. For example, using a relay without actual contacts - a solid-state relay. The solid-state relay can indeed avoid misoperation of the contacts during the impact process, but the solid-state relay also has a series of disadvantages. The price is about 5 times that of the electromagnetic relay; the volume is too large to fit in a small gas-insulated switchgear protection; the contact current is small, and the circuit breaker coil is an inductive load, and the impact current is large, which affects the service life of the relay.

[0005] How to avoid misoperation of the 48V circuit breaker and have good economy to meet the installation of a small gas-insulated switchgear is a technical problem that technicians urgently need to solve at present. Content of the Utility Model

[0006] The purpose of the utility model is to provide an electrical cabinet for avoiding misoperation of a 48V circuit breaker to solve the above technical problems.

[0007] The technical solution adopted by the present utility model is as follows:

[0008] An electrical cabinet for avoiding misoperation of a 48V circuit breaker, comprising two relay groups arranged in a box body. One relay group is arranged in the closing circuit and the other relay group is arranged in the tripping circuit. Both relay groups include two relays connected in series. The two relays in each group are arranged perpendicular to each other in the horizontal direction in the box body.

[0009] Preferably, mounting plates are fixedly provided at the bottoms of the relays. Each relay is mounted on the inner side wall of the box body through the mounting plate. One relay in the same relay group is mounted on the inner side wall of the box body in the left - right direction and the other relay in this group is mounted on the inner side wall of the box body in the front - back direction.

[0010] Preferably, the electromagnetic coils of the two relays in each relay group share one power supply.

[0011] Preferably, each relay group includes two static contacts respectively cooperating with the moving contacts of the corresponding relays. One static contact is wired to one terminal through a wire, and the other static contact is wired to another wiring terminal through a wire. The two moving contacts are connected through a wire to realize the series connection of the two relays in the same relay group.

[0012] Preferably, the relay is an electromagnetic relay.

[0013] In the electrical cabinet of the present utility model, the two relays corresponding to the relay groups in the closing circuit and the tripping circuit are connected in series, and the two relays in each group are arranged perpendicular to each other in the horizontal direction in the box body. In this way, no matter being impacted along the front - back direction of the cabinet body or along the left - right direction of the cabinet body, at most one relay in each group will be attracted under the impact. The circuit where the relay is located is still open, and it will not cause misoperation of the 48V circuit breaker. Moreover, since there is no instantaneous large current in the attracted circuit breaker, the attracted point quickly disengages and maintains the initial state. It not only solves the technical problem of misoperation of the 48V circuit breaker, but also the cost is only twice that of the original relay, the cost is controllable, and it can be installed in the current small gas - filled cabinet. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the electrical cabinet in Embodiment 1 of the present utility model. Detailed Embodiment

[0015] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0016] Embodiment 1

[0017] An electrical cabinet for avoiding misoperation of a 48V circuit breaker, as Figure 1 shown, includes two relay groups provided in a box body 1. One relay group is arranged in the closing circuit and the other relay group is arranged in the tripping circuit. The relay group in the closing circuit includes two relays 3, 3' connected in series. The relay group in the tripping circuit includes two relays 10, 10' connected in series. The two relays in each group are arranged perpendicular to each other in the horizontal direction in the box body. In this embodiment, the relays are electromagnetic relays of the same model.

[0018] Mounting plates are fixedly provided at the bottoms of the respective relays. Each of the relays is mounted on the inner side wall of the box body through the mounting plate. Specifically, mounting seats 4 are provided on the inner side wall 2 of the box body. Each relay is welded or bolted to the fixed seat through the mounting plate. One relay in the same relay group is mounted on the inner side wall of the box body in the left-right direction and the other relay in the group is mounted on the inner side wall of the box body in the front-rear direction. The electromagnetic coils of the two relays in each relay group share a power supply 5, 11.

[0019] The relay group in the closing circuit includes two static contacts 7, 7' respectively cooperating with the moving contacts of the corresponding relays. One static contact 7 is wired to a terminal 6 through a wire, and the other static contact 7' is wired to another terminal 6' through a wire. The two moving contacts 8, 8' are connected by a wire to realize the series connection of the two relays in the same relay group.

[0020] The relay group in the tripping circuit includes two static contacts 13, 13' respectively cooperating with the moving contacts of the corresponding relays. One static contact 13 is wired to a terminal 12 through a wire, and the other static contact 13' is wired to another terminal 12' through a wire. The two moving contacts 14, 14' are connected by a wire to realize the series connection of the two relays in the same relay group.

[0021] In the electrical cabinet of this embodiment, two relays corresponding to the relay group in the closing circuit and the tripping circuit are connected in series, and the two relays in each group are arranged perpendicular to each other in the horizontal direction in the cabinet body. In this way, no matter whether it is impacted along the front-back direction or the left-right direction of the cabinet body, at most one relay in each group will be attracted under the impact, and the circuit where the relay is located is still open, which will not cause misoperation of the 48V circuit breaker. Moreover, since there is no instantaneous large current in the attracted circuit breaker, the attracted point quickly disengages and maintains the initial state. This not only solves the technical problem of misoperation of the 48V circuit breaker, but also the cost is only twice that of the original relay, the cost is controllable, and it can be installed in the current small gas-insulated switchgear.

[0022] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electrical cabinet for avoiding misoperation of a 48V circuit breaker, characterized in that: It includes two relay groups arranged in a box body. One relay group is arranged in a closing circuit and the other relay group is arranged in a tripping circuit. Both relay groups include two relays connected in series. The two relays in each group are arranged perpendicular to each other in the horizontal direction in the box body.

2. The electrical cabinet for avoiding misoperation of the 48V circuit breaker according to claim 1, wherein: Mounting plates are fixedly provided at the bottoms of the respective relays. Each relay is mounted on the inner side wall of the box body through the mounting plate. One relay in the same relay group is mounted on the inner side wall of the box body in the left-right direction and the other relay in the group is mounted on the inner side wall of the box body in the front-back direction.

3. An electrical cabinet for avoiding misoperation of a 48V circuit breaker according to claim 2, characterized in that: The electromagnetic coils of the two relays in each relay group share one power supply.

4. An electrical cabinet for avoiding misoperation of a 48V circuit breaker according to claim 3, characterized in that: Each relay group includes two static contacts respectively cooperating with the moving contacts of the corresponding relays. One static contact is wired to one terminal through a wire, and the other static contact is wired to another wiring terminal through a wire. The two moving contacts are connected by a wire to realize the series connection of the two relays in the same relay group.

5. An electrical cabinet for avoiding misoperation of a 48V circuit breaker according to any one of claims 1-4, characterized in that: The relay is an electromagnetic relay.

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