An insulation guard for a generator outlet breaker

Abstract

This utility model discloses an insulation protection device for a generator outlet circuit breaker, comprising a grounding flat steel embedded outside the insulation distance around the generator outlet circuit breaker. Several vertical ribs are vertically arranged on the top of the grounding flat steel, and several horizontal ribs are horizontally connected to the vertical ribs. The vertical and horizontal ribs are hollow metal tubes with an insulating layer on their outer surface. The vertical ribs, together with the grounding flat steel and the horizontal ribs, form an insulating fence. A dustproof baffle is installed on the top of the insulating fence, and several temperature sensors are installed on the insulating fence. This technical solution utilizes the strength of stainless steel to achieve the structural strength of the insulating protective net; it uses an epoxy resin coating and a bolt structure with an insulating sheath to avoid structural component heating caused by induced current on the busbar; and it utilizes the reliable connection between the vertical ribs and the grounding grid to achieve zero potential of the external protective structure, ensuring personnel safety and reliability.

Description

Technical Field

[0001] This utility model relates to the field of motor outlet circuit breakers, and in particular to an insulation protection device for generator outlet circuit breakers. Background Technology

[0002] In hydropower projects, generators and main transformers are connected via high-current busbars. Power plants commissioned before the 1990s generally used bare busbars for their 100MW and above units due to limitations in installed capacity and technology at the time. This necessitated modifications to the generator outlets. Consequently, many operating power plants using bare busbars underwent insulation upgrades. However, these upgrades still had insulation blind spots, primarily because: bare busbars typically did not have insulated enclosures for their generator circuit breakers. For example, the currently used HECI 3 type generator circuit breaker would have its original ventilation and heat dissipation design compromised if a metal enclosure were directly installed, leading to complex three-phase induced current conditions. Therefore, the metal enclosure installation solution required original equipment manufacturer (OEM) certification. However, early generator circuit breakers were typically supplied with technical services by foreign manufacturers such as ABB, Mitsubishi, and ALSTOM. The generator circuit breakers compatible with the bare busbars mentioned above have long been discontinued, and related production lines have been stagnant for many years, making it extremely unlikely to obtain OEM approval for a metal enclosure solution.

[0003] Therefore, it is necessary to propose an insulation protection method that does not change the existing ventilation and heat dissipation structure of the generator circuit breaker, does not cause induced electromagnetic heating, and also has a certain structural strength. Utility Model Content

[0004] This utility model patent aims to address the shortcomings of the prior art by providing an insulation protection device for a generator circuit breaker. This device solves the problem that generator circuit breakers in the prior art lack enclosure protection, and also addresses the technical issues of low structural strength, poor electromagnetic heating resistance, and insufficient insulation protection of a single metal enclosure.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: an insulation protection device for a generator outlet circuit breaker, comprising a grounding flat steel embedded outside the insulation distance around the generator outlet circuit breaker, wherein a number of vertical ribs are vertically arranged on the top of the grounding flat steel, and a number of horizontal ribs are horizontally connected to the vertical ribs, wherein the vertical ribs and horizontal ribs comprise hollow metal tubes, wherein an insulating layer is provided on the outer surface of the hollow metal tubes, wherein the vertical ribs cooperate with the grounding flat steel and the horizontal ribs to form an insulating fence, wherein a dustproof baffle is installed on the top of the insulating fence, and a number of temperature sensors are installed on the insulating fence.

[0006] Preferably, each of the vertical ribs has a plurality of through holes, and each of the horizontal ribs has a plurality of through holes. The plurality of through holes correspond to the through holes on the vertical ribs. The vertical ribs and the horizontal ribs are detachably connected by bolt groups. Insulating sleeves are provided in the through holes and through holes.

[0007] Preferably, the top of the plurality of vertical ribs is detachably connected to a connecting plate via a bolt assembly, and the top of the connecting plate is detachably connected to a dustproof baffle.

[0008] Preferably, the dustproof baffle is arc-shaped and made of polycarbonate material.

[0009] Preferably, an insulating layer is provided on the side of the dustproof baffle closest to the exposed busbar.

[0010] Preferably, the hollow metal tube is made of stainless steel, and the insulating layer is coated with epoxy resin.

[0011] Preferably, a gate is provided on the side of the insulating fence away from the exposed busbar of the generator outlet circuit breaker.

[0012] Preferably, the bolt assembly includes an insulated bolt and an insulated nut.

[0013] The beneficial effects of this utility model are:

[0014] This technical solution utilizes the strength of stainless steel to achieve the structural strength of the insulating protective net; it uses an epoxy resin coating and a bolt structure with an insulating sheath to avoid structural component heating caused by induced current on the busbar; and it uses the reliable connection between the vertical ribs and the grounding grid to achieve zero potential of the external protective structure, ensuring personnel safety and reliability. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the HEC13 generator circuit breaker in the prior art;

[0017] Figure 2 This is a schematic diagram of the insulating protective fence and the pre-embedded grounding flat steel of this utility model;

[0018] Figure 3 This is a schematic diagram of the insulating protective fence of this utility model;

[0019] Figure 4 This is a schematic diagram of the vertical and horizontal reinforcing bars of this utility model;

[0020] Figure 5 This is a schematic diagram showing the connection relationship between the vertical and horizontal reinforcing bars of this utility model;

[0021] Figure 6This is a front view of the present utility model;

[0022] Attached reference numerals: 1. Grounding flat steel; 2. Vertical rib; 3. Horizontal rib; 4. Hollow metal tube; 5. Insulation layer; 6. Dustproof baffle; 7. Temperature sensor; 8. Connecting plate; 9. Insulation sleeve. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1-4 As shown, an insulation protection device for a generator outlet circuit breaker includes a grounding flat steel 1 embedded outside the insulation distance around the generator outlet circuit breaker. Several vertical ribs 2 are vertically arranged on the top of the grounding flat steel 1, and several horizontal ribs 3 are horizontally connected to the vertical ribs 2. The vertical ribs 2 and horizontal ribs 3 include hollow metal tubes 4, and the outer surface of the hollow metal tubes 4 is provided with an insulation layer 5. The vertical ribs 2, together with the grounding flat steel 1 and the horizontal ribs 3, form an insulation fence. A dustproof baffle 6 is installed on the top of the insulation fence, and several temperature sensors 7 are installed on the insulation fence. In this embodiment, due to safety hazards caused by the exposed busbars of older 100MW generator units, several vertical ribs 2 are installed outside the safety insulation range around the generator unit. Several horizontal ribs 3 are horizontally connected to the vertical ribs 2, and the vertical ribs 2 and horizontal ribs 3 form an insulation fence. The insulation fence is installed outside the generator's safety insulation range (at least 30cm from the top of the generator circuit breaker's outer contour and at least 60cm from the control cabinet surface). (cm, with side phases greater than or equal to 60cm, and terminal blocks on the main transformer side and generator side greater than or equal to 30cm). To address the induced electricity generated around the generator, grounding flat steel is connected to the bottom of several vertical ribs 2. The grounding flat steel is pre-embedded around the generator and can be fixed to the vertical ribs 2 by means of threads or welding. Both the vertical ribs 2 and the horizontal ribs 3 are made of hollow metal tubes 4 with an outer layer of insulation 5 to prevent personnel from touching them and causing safety hazards. At the same time, the metal part of each fence vertical rib is fixedly connected to the grounding flat steel. The grounding flat steel is arranged in a U-shape around the metal fence and two grounding flat steels are led out to connect to the grounding grid. Specifically, the hollow metal tube is rectangular and placed in the inner layer, and the insulation layer is placed in the outer layer. The thickness of both materials is greater than 2mm. Before spraying epoxy resin material on the steel pipe, it needs to be washed with water and acid to ensure the adhesion of epoxy resin material. In this embodiment, the temperature sensor 7 is used to monitor the temperature of the generator nut wire during use. The temperature sensor 7 can be a fiber optic temperature sensor from the prior art.

[0025] Preferably, each of the vertical ribs 2 has through holes, and each of the horizontal ribs 3 has through holes. The through holes correspond to the through holes on the vertical ribs 2. The vertical ribs 2 and the horizontal ribs 3 are detachably connected by bolt sets. Insulating sleeves 9 are provided in the through holes and through holes. In this embodiment, the vertical ribs 2 and the horizontal ribs 3 are detachably connected by bolt sets through holes. Compared with integrated welding production methods, this method is more convenient to install and easier to replace. Specifically, several through holes are opened on the vertical ribs 2, and several through holes are opened on the horizontal ribs 3. During installation, the through holes on the horizontal ribs 3 are connected to the through holes on the vertical ribs 2 by bolt sets.

[0026] Preferably, a connecting plate 8 is detachably connected to the top of the plurality of vertical ribs 2 via bolt assemblies, and a dustproof baffle 6 is detachably connected to the top of the connecting plate 8. In this embodiment, in order to prevent dust from interfering with the exposed busbar, a dustproof baffle needs to be installed outside the safe insulation position on the top of the exposed busbar. This application uses a connecting plate 8 on the top of the plurality of vertical ribs 2 and a dustproof baffle 6 on the top of the connecting plate 8 to prevent dust from falling into the exposed busbar. The connecting plate 8 can be an insulating structure.

[0027] Preferably, the dustproof baffle 6 is arc-shaped and made of polycarbonate. Both the connecting plate 8 and the dustproof baffle 6 can be made of insulating structure, including polycarbonate material.

[0028] Preferably, an insulating layer 5 is provided on the side of the dustproof baffle 6 near the exposed busbar. In order to further ensure the insulation of the dustproof baffle during use, an insulating layer 5 can be provided on the side of the dustproof baffle 6 near the exposed busbar to further increase the insulation effect.

[0029] Preferably, the hollow metal tube 4 is made of stainless steel, and the insulation layer 5 is made of epoxy resin coating. The strength of stainless steel is used to achieve the structural strength of the insulation protection net. The epoxy resin coating and the bolt structure with insulating sleeve are used to avoid the structural components from heating up due to the large induced current on the busbar. The reliable connection between the vertical ribs and the grounding grid is used to achieve zero potential of the external protection structure, ensuring the safety and reliability of personnel.

[0030] Preferably, a gate is provided on the side of the insulating fence away from the exposed busbar of the generator outlet circuit breaker. The insulating fence is arranged in a U-shape, with a gate on the side away from the exposed busbar of the generator outlet circuit breaker, allowing construction personnel to enter for maintenance.

[0031] Preferably, the bolt assembly includes an insulating bolt and an insulating nut. In this embodiment, the bolt assembly may be an insulating nut, an insulating bolt, or other bolt assembly supported by insulating material.

[0032] The specific working method of this application is as follows: In this embodiment, grounding flat steel 1 is first pre-embedded around the generator, and several vertical ribs 2 are fixedly installed along the grounding flat steel. Horizontal ribs 3 are then connected to the vertical ribs 2 to form a U-shaped insulating fence structure. A dustproof baffle 6 is then installed on the top of the generator through a connecting plate 8. The strength of the stainless steel material is used to achieve the structural strength of the insulating protective net. The epoxy resin coating and bolt structure with insulating sleeves are used to avoid the structural components from overheating caused by the induced large current on the busbar. The vertical ribs are reliably connected to the grounding grid.

[0033] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. An insulation protection device for a generator outlet circuit breaker, characterized in that, The device includes a grounding flat steel (1) pre-embedded outside the insulation distance around the generator outlet circuit breaker. The grounding flat steel (1) has several vertical ribs (2) vertically arranged on its top. Several horizontal ribs (3) are connected horizontally on the vertical ribs (2). The vertical ribs (2) and horizontal ribs (3) include hollow metal tubes (4). The outer surface of the hollow metal tubes (4) is provided with an insulation layer (5). The vertical ribs (2) and the horizontal ribs (3) cooperate to form an insulation fence. A dustproof baffle (6) is installed on the top of the insulation fence. Several temperature sensors (7) are installed on the insulation fence.

2. The insulation protection device for a generator outlet circuit breaker according to claim 1, characterized in that: The vertical ribs (2) are provided with several through holes, and the horizontal ribs (3) are provided with several through holes. The several through holes correspond to the through holes on the vertical ribs (2). The vertical ribs (2) and the horizontal ribs (3) are detachably connected by bolt groups. Insulating sleeves (9) are provided in the through holes and through holes.

3. The insulation protection device for a generator outlet circuit breaker according to claim 1, characterized in that: The top of the plurality of vertical ribs (2) is detachably connected to a connecting plate (8) by bolt assembly, and the top of the connecting plate (8) is detachably connected to a dustproof baffle (6).

4. The insulation protection device for a generator outlet circuit breaker according to claim 3, characterized in that: The dustproof baffle (6) is arc-shaped and made of polycarbonate.

5. The insulation protection device for a generator outlet circuit breaker according to claim 4, characterized in that: An insulating layer (5) is provided on the side of the dustproof baffle (6) near the exposed busbar.

6. The insulation protection device for a generator outlet circuit breaker according to claim 5, characterized in that: The hollow metal tube (4) is made of stainless steel, and the insulating layer (5) is made of epoxy resin coating.

7. The insulation protection device for a generator outlet circuit breaker according to claim 1, characterized in that: A gate is provided on the side of the insulated fence away from the exposed busbar of the generator outlet circuit breaker.

8. The insulation protection device for a generator outlet circuit breaker according to claim 1, characterized in that: The bolt assembly includes an insulated bolt and an insulated nut.

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