CN218275783U - A phase-to-ground isolation structure of a drawer-type circuit breaker - Google Patents

Abstract

A relative isolation structure of a drawer type circuit breaker, which includes a drawer seat (1) and a circuit breaker body (2), the side plate (101) of the drawer seat (1) is equipped with a guide rail group (102), a slide plate ( 103) snapped on the guide rail group (102), the insulating base plate (201) of the circuit breaker body (2) is provided with a conductive part (202) protruding from the insulating base plate (201), characterized in that: Insulators (104) are installed on one or more of the side panels (101), guide rails (102) or slides (103), and the circuit breaker body (2) is connected to the drawer seat (1) position, the insulator (104) is located between the conductive part (202) of the circuit breaker body (2) and the guide rail set (102) or/and the slide plate (103) or/and the side plate (101), so that The electrical isolation between the conductive part (202) and the guide rail group (102) or/and the sliding plate (103) or/and the side plate (101) is realized. By simply improving the existing drawer base, electrical isolation can be achieved between the busbar of the main body and the side conductors of the drawer base, thereby increasing the electrical clearance or creepage distance.

Description

A phase-to-ground isolation structure of a drawer-type circuit breaker

technical field

The utility model belongs to the technical field of circuit breakers, and in particular relates to a relative isolation structure of a drawer type circuit breaker, which can electrically isolate the body busbar from the side conductors of the drawer seat and increase the electrical gap or creepage distance.

Background technique

Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. Low-voltage circuit breaker, also known as automatic switch, commonly known as "air switch", also refers to low-voltage circuit breaker. It is an electrical appliance that not only has the function of manual switch, but also can automatically protect against voltage loss, undervoltage, overload, and short circuit. It can be used to distribute electric energy, start asynchronous motors infrequently, protect power lines and motors, etc., and can automatically cut off the circuit when they have severe overload, short circuit and undervoltage faults. Its function is equivalent to a fuse switch and The combination of overheating and underheating relays, etc., and generally does not need to change parts after breaking the fault current, has been widely used.

Circuit breakers have a variety of structures according to their performance requirements. Among them, the withdrawable frame circuit breaker is a relatively common structure used in the low-voltage electrical industry. It is mainly composed of a circuit breaker body and a drawer seat. As shown in Figure 1, the existing common drawer type circuit breaker is only insulated by air. Due to space constraints, when the body of the drawer type circuit breaker is in the connection position of the drawer base, there is no gap between the busbar of the body and the side conductors of the drawer base. Insulation barrier measures, when there is a large voltage impact or when the short-circuit current is broken, the bus bar exposed outside the bottom plate of the insulating base of the circuit breaker body and the conductor on the side of the drawer seat are easily broken down, causing a grounding short circuit of the circuit breaker.

In order to solve the technical problem that the above-mentioned drawer-type circuit breaker is easily broken down through air insulation, causing a grounding short circuit of the circuit breaker, Chinese patent ZL201010232464.7 discloses a high-insulation circuit breaker, including a body part and a drawer part, wherein: the body The part includes the circuit breaker body and body slotting knife; the drawer part includes the drawer side plate, arc isolation device, bridge contact, drawer base, and bottom plate. The drawer side plate is located on both sides of the circuit breaker body, and the bottom plate is located at the bottom of the circuit breaker body; The arc device is set between the bridge contact and the body blade, which plays an insulating role when the circuit breaker is in the separated position; the body blade and the bridge contact are respectively installed in the corresponding mutually insulated circuit breaker body and drawer base ;When the circuit breaker is in the connection position, the body blade is connected to the bridge contact; it is characterized in that: at least one insulating member is provided between the conductive part of the circuit breaker body exposed outside the insulating part and the inside of the drawer ; each of the insulators is located on the circuit breaker body; at least one of the insulators is a pair of insulating plates, the pair of insulating plates are installed on both sides of the circuit breaker body, and the front end of each of the insulating plates protrudes For the circuit breaker body, when the body blade is connected to the bridge contact, the front end of each insulating plate is located between the drawer side plate and the drawer base; A set of bosses and a set of grooves, each of the bosses is located in each of the corresponding grooves, together forming a labyrinth structure. However, the technical solution has a complicated structure, and the requirements for matching the dimensions of the boss and the groove are high. The closed structure will reduce the heat dissipation performance and increase the temperature rise of the product.

Utility model content

The purpose of this utility model is to provide a relative isolation structure of a drawer circuit breaker for the above-mentioned existing drawer type circuit breaker with complex insulation and isolation structure, which easily leads to excessive temperature rise of the product. Simple improvement can achieve electrical isolation between the main body busbar and the side conductors of the drawer seat, increasing the electrical clearance or creepage distance.

Technical solutions

In order to achieve the above technical purpose, the utility model provides a relative isolation structure of a drawer type circuit breaker, which includes a drawer seat and a circuit breaker body. On the guide rail set, the insulating base plate of the circuit breaker body is provided with a conductive part protruding from the insulating base plate, and it is characterized in that: the side plate, one or several of the guide rail set or the slide plate are equipped with insulating parts, and the When the circuit breaker body and the drawer seat are in the connected position, the insulating member is located between the conductive part of the circuit breaker body and the guide rail group or/and the slide plate or/and the side plate, thereby realizing the connection between the conductive part and the guide rail. Electrical isolation between groups or/and slides or/and side panels.

Further, the guide rail set includes guide rail 1 and guide rail 2, and the guide rail 1 and guide rail 2 are installed side by side up and down on the inner side of the side plate.

Further, the side plates, guide rail sets and slide plates are all conductors.

Beneficial effect

The utility model provides a relatively isolated structure of a drawer type circuit breaker, which has a simple structure and low requirements on dimensional accuracy. When the circuit breaker body is rocked into the connection position, the insulator is blocked between the body conductor and the guide rail or slide plate or side plate, which is a dislocation structure and has little effect on the heat dissipation performance. By simply improving the existing drawer base, electrical isolation can be achieved between the main body busbar and the side conductors of the drawer base, and the electrical clearance or creepage distance can be increased.

Description of drawings

Accompanying drawing 1 is the schematic diagram of the relative ground isolation structure of the existing drawer type circuit breaker.

Accompanying drawing 2 is the structural diagram of the drawer base in the first embodiment of the utility model.

Figure 3 is a schematic diagram of the installation structure of the drawer seat and the circuit breaker body in the first embodiment of the utility model.

Accompanying drawing 4 is the structural diagram of the drawer seat in the first embodiment of the utility model.

Figure 5 is a schematic diagram of the installation structure of the drawer seat and the circuit breaker body in the first embodiment of the present invention.

detailed description

The technical solutions of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the utility model, but not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "inner", "outer" and the like are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the Describes, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that unless otherwise specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or Integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

The utility model will be described in further detail below through specific embodiments in conjunction with the accompanying drawings.

Example 1

As shown in Figures 2 and 3, a relatively isolated structure of a drawer type circuit breaker includes a drawer base 1 and a circuit breaker body 2, the side plate 101 of the drawer base 1 is equipped with a guide rail group 102, and the slide plate 103 is locked. Installed on the guide rail set 102, in this embodiment, the guide rail set 102 includes a guide rail 102a and a guide rail 2 102b, and the guide rail 1 102a and the guide rail 2 102b are installed side by side on the inner side of the side plate 101 up and down. The side plate 101, the guide rail group 102 and the slide plate 103 are all conductors. As shown in Figure 2, the insulating bottom plate 201 of the circuit breaker body 2 is provided with a conductive part 202 protruding from the insulating bottom plate 201, an insulating part 104' is installed on the side plate 101, and an insulating part 104' is installed on the sliding plate 103. There is insulating part 2 104", when the circuit breaker body 2 is rocked into the drawer seat 1 and is in the connection position, as shown in Figure 3, when the circuit breaker body 2 is rocked into the drawer seat 1, the circuit breaker When the main body 2 and the drawer seat 1 are in the connected position, the first insulating part 104' is located between the conductive part 202 of the circuit breaker body 2, the first guide rail 102a and the side plate 101, and the second insulating part 104" is located between the Between the conductive part 202 of the circuit breaker body 2 and the second guide rail 102b, the sliding plate 103, and the side plate 101, the electrical isolation between the conductive part 202 and the guide rail group 102, the sliding plate 103, and the side plate 101 is realized. It should be noted that the insulator 104 composed of the first insulator 104' and the second insulator 104" can also be adjusted in an appropriate position so as to realize only the electrical connection between the conductive part 202 and the guide rail set 102 or the slide plate 103 or the side plate 101. isolation.

Example 2

As shown in Figure 4, an insulator 3 104"' is installed on the side plate 101 and the guide rail set 102 of the drawer base 1. As shown in Figure 5, when the circuit breaker body 2 is rocked to the connection position, the insulator 3 104"' is located between the conductive part 202 on the upper part of the circuit breaker body 2 and the first guide rail 102a and the side plate 101, and is also located between the conductive part 202 on the lower part of the circuit breaker body 2 and the second guide rail 102b, the slide plate 103, and the side plate Between 101. In this way, electrical isolation between the conductive portion 202 and the guide rail set 102 , the sliding plate 103 and the side plate 101 is realized.

The utility model provides a relatively isolated structure of a drawer type circuit breaker, which has a simple structure and low requirements on dimensional accuracy. When the circuit breaker body is rocked into the connection position, the insulator is blocked between the body conductor and the guide rail or slide plate or side plate, which is a dislocation structure and has little effect on the heat dissipation performance. By simply improving the existing drawer base, electrical isolation can be achieved between the main body busbar and the side conductors of the drawer base, and the electrical clearance or creepage distance can be increased.

Claims (3)

1. The utility model provides a withdrawable circuit-breaker's isolation structure relatively, it includes drawer seat (1) and circuit breaker body (2), be equipped with guide rail group (102) on curb plate (101) of drawer seat (1), slide (103) clamp is in on guide rail group (102), be provided with on insulating bottom plate (201) of circuit breaker body (2) conductive part (202) of protrusion insulating bottom plate (201), its characterized in that: one or more of the side plate (101), the guide rail group (102) or the sliding plate (103) is/are provided with an insulating piece (104), when the circuit breaker body (2) is in a connection position with the drawer base (1), the insulating piece (104) is positioned between a conductive part (202) of the circuit breaker body (2) and the guide rail group (102) or/and the sliding plate (103) or/and the side plate (101), so that the conductive part (202) is electrically isolated from the guide rail group (102) or/and the sliding plate (103) or/and the side plate (101).

2. The relative earth isolation structure of a withdrawable circuit-breaker according to claim 1, wherein: the guide rail group (102) comprises a first guide rail (102 a) and a second guide rail (102 b), and the first guide rail (102 a) and the second guide rail (102 b) are arranged on the inner side of the side plate (101) in a vertical side-by-side mode.

3. The relative earth isolation structure of a withdrawable circuit-breaker according to claim 1, wherein: the side plates (101), the guide rail group (102) and the sliding plate (103) are all conductive bodies.

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