CN210404478U - Neutral point grounding resistance cabinet of medium-voltage power grid - Google Patents

Abstract

The utility model discloses a neutral point grounding resistor cabinet of a medium-voltage power grid, which comprises a cabinet body and a resistor, wherein the cabinet body is of a box structure provided with a switch door, a wall bushing is arranged at the top of the cabinet body in a penetrating way, the resistor is three groups of resistors which are parallel to each other and horizontally arranged on a support, the three groups of resistors are connected through a first insulating stand column, the support comprises an upper support and a lower support, a second insulating stand column is arranged between the resistor and the upper support as well as between the resistor and the lower support, the side wall of the cabinet body is provided with a vent, the inner side of the vent is provided with a bar-shaped limiting; the utility model discloses a change the mode that sets up of current resistance, optimize cabinet internal structure to be provided with in current vent department and dismantle the filter screen, when guaranteeing to ventilate, place the entering of debris, the stability of the inside electrical components operation of improvement.

Description

Neutral point grounding resistance cabinet of medium-voltage power grid

The technical field is as follows:

the utility model relates to a power transmission and transformation field especially relates to a neutral point grounding resistance cabinet of medium voltage electric wire netting.

Background art:

the grounding mode of the neutral point of the power distribution system usually has the neutral point which is not grounded, the neutral point which is grounded through a resistor and the neutral point which is grounded through an arc suppression coil. The various grounding modes are different, and the using mode is also different. With the development of national economy, many urban power distribution networks have changed the situation that overhead lines are the main situation in the past, but cable lines are the main situation, and meanwhile, some novel devices, such as closed SF6 switch cabinets with compact structures, crosslinked polyethylene cables, zinc oxide lightning arresters and the like, are more and more widely applied, so that some of the originally-used non-effective grounding modes are not applicable. At present, China has a plurality of power distribution network neutral points which adopt an operation mode of grounding through a resistor. After the neutral point grounding resistance cabinet is installed, when non-metallic grounding occurs, the current flowing through the grounding point and the neutral point is obviously reduced under the influence of the grounding point resistance compared with the current flowing through metallic grounding, meanwhile, the rise of sound phase voltage is also obviously reduced, and the zero sequence voltage value is about half of single-phase metallic grounding.

But the cabinet body all is installed in the open air, because the operation of inside electrical components need to guarantee that the internal portion of cabinet has suitable humiture, consequently, all be provided with the vent on the current cabinet body, however, the existence of vent can inevitably cause the entering of some debris, influences inside electrical components's normal work, and simultaneously, the internal portion's of current cabinet resistance all is vertical setting, and this kind of setting mode needs the cabinet body to have certain height, and is inconvenient in transportation and the installation.

The utility model has the following contents:

the utility model discloses the technical problem that will solve is: overcome prior art's not enough, through the mode that sets up that changes current resistance, optimize cabinet body inner structure to be provided with in current vent department and dismantle the filter screen, when guaranteeing to ventilate, place the medium voltage electric wire netting neutral point grounding resistance cabinet that debris got into.

The technical scheme of the utility model is that: the utility model provides a neutral point grounding resistance cabinet of medium voltage electric network, includes the cabinet body and resistance, the cabinet body is the box structure who is provided with the switch door, the top of the cabinet body is run through and is set up the wall bushing, resistance is for being parallel to each other and the level sets up three group's resistances on the support, and connects through first insulating stand between three group's resistances, the support includes upper bracket and lower carriage, and is provided with the insulating stand of second between resistance and upper bracket and the lower carriage, and cabinet side wall sets up the vent, just the vent inboard is provided with the spacing draw-in groove of bar, the inside filter screen that is provided with of spacing draw-in groove.

Furthermore, the filter screen is provided with all around slide and spacing plastics frame in the spacing draw-in groove of bar, and plastics frame and filter screen structure as an organic whole, it is the dacron filter screen to be the filter screen.

Further, the bar-shaped limiting clamping groove is embedded into the wall of the cabinet body at the position of the vent, the top of the bar-shaped limiting clamping groove is provided with a slope, and the bottom of the bar-shaped limiting clamping groove is provided with a flow guide hole communicated with the air outside the cabinet body.

Further, the first insulating column is a 60 insulating column, and the second insulating column is a 130 insulating column.

Further, cabinet body top is provided with rack brow and rings, cabinet body bottom is provided with the base.

The utility model has the advantages that:

1. the utility model discloses a change the mode that sets up of current resistance, optimize cabinet internal structure to be provided with in current vent department and dismantle the filter screen, when guaranteeing to ventilate, place the entering of debris, the stability of the inside electrical components operation of improvement.

2. The utility model discloses change the vertical mode that sets up of original resistance into the level mode that sets up, reduced the height of the cabinet body to a certain extent, make things convenient for people to transport box installation operation, reach simultaneously between the resistance and the cabinet body between be provided with insulating stand, guarantee the safety of operation.

3. The utility model discloses resistance passes through the support setting on the cabinet body, changes the emergence of the fixed not firm scheduling problem that current resistance directly caused on the cabinet body through insulating stand setting, and resistance sets up the multiunit simultaneously, can carry out the alternative use according to the condition, is convenient for operate.

4. The utility model discloses set up the detachable filter screen in vent department, because the spacing draw-in groove of bar is embedded in the cabinet body wall, guaranteed the level and smooth of internal wall of cabinet, simultaneously, the spacing draw-in groove top of bar is provided with the slope, can conveniently place and dismantle the installation to the filter screen.

5. The utility model discloses the inside bottom of the spacing draw-in groove of bar is provided with the water conservancy diversion hole that communicates with the external atmosphere of cabinet, and some rainwater gets into the internal portion back of cabinet through the ventilation hole, can assemble in the spacing draw-in groove bottom of bar under the effect of gravity under the stopping of filter screen to effect through the water conservancy diversion hole is discharged the rainwater.

6. The utility model discloses being provided with the plastics frame around the filter screen, can playing the supporting role to the filter screen, simultaneously, the spacing draw-in groove of the bar of being convenient for is fixed spacingly to the filter screen, and the filter screen of also being convenient for moves in spacing kerve.

Description of the drawings:

fig. 1 is a front view of a neutral point grounding resistor cabinet of a medium-voltage power grid.

Fig. 2 is a top view of a neutral point grounding resistor cabinet of a medium voltage network.

Fig. 3 is a sectional view of a neutral point grounding resistor cabinet of a medium voltage network.

Fig. 4 is a schematic structural diagram of a in fig. 3.

Fig. 5 is a schematic structural view of a filter screen during taking and placing.

Fig. 6 is a schematic structural view of the filter screen.

The specific implementation mode is as follows:

example (b): referring to fig. 1, 2, 3, 4, 5 and 6, in the drawings, 1-a cabinet body, 2-a resistor, 3-a switch door, 4-a wall bushing, 5-a first insulating upright post, 6-an upper bracket, 7-a lower bracket, 8-a second insulating upright post, 9-a ventilation opening, 10-a strip-shaped limiting clamping groove, 11-a filter screen, 12-a plastic frame, 13-a diversion hole, 14-a cabinet brow, 15-a hanging ring and 16-a base.

Resistance cabinet in neutral point ground connection of medium voltage electric wire netting, including the cabinet body 1 and resistance 2, the cabinet body 1 is for being provided with the box structure of switch door 3, the top of the cabinet body 1 is run through and is set up wall bushing 4, resistance 2 is for being parallel to each other and the three group's resistances of level setting on the support, and connect through first insulating stand 5 between the three group's resistance, the support includes upper bracket 6 and lower carriage 7, and be provided with the insulating stand 8 of second between resistance 2 and upper bracket 6 and the lower carriage 7, the cabinet body 1 lateral wall sets up vent 9, and vent 9 inboard is provided with the spacing draw-in groove 10 of bar, the inside filter screen 11 that is provided with of spacing draw.

Further, the filter screen 11 is provided with a plastic frame 12 which slides in the bar-shaped limit slot 10 and is limited around, and the plastic frame 12 and the filter screen 11 are of an integral structure, i.e. the filter screen 11 is a terylene filter screen.

Further, the bar-shaped limiting clamping groove 10 is embedded into the cabinet body wall at the vent 9, the top of the bar-shaped limiting clamping groove is provided with a slope 17, and the bottom of the bar-shaped limiting clamping groove is provided with a flow guide hole 13 communicated with the air outside the cabinet body 1.

Further, the first insulating column 5 is a 60 insulating column, and the second insulating column 8 is a 130 insulating column.

Further, a cabinet brow 14 and a hanging ring 15 are arranged at the top of the cabinet body 1, and a base 16 is arranged at the bottom of the cabinet body 1.

When the multifunctional electric appliance is used, in the actual working and using process, people can select a plurality of groups of resistors 2 to use according to the actual condition and the condition of the resistors 2 (when the resistors 2 have a proper amount of problems and need to be changed, other resistors 2 can be temporarily selected and connected, so that subsequent uniform replacement is convenient, when a plurality of groups of resistors 2 with different resistance values need to be connected at a neutral point, a plurality of resistor groups can be connected through connecting wires), so that the multifunctional electric appliance is convenient to operate, meanwhile, people can check the blocking condition of the filter screen 11 (the dust adsorbs to the filter screen 11) when regularly checking the electric appliance, the filter screen 11 is taken out to be cleaned or replaced when the dust is accumulated thickly, and the filter screen 11 is embedded into the inner wall of the cabinet body through the strip-shaped limiting clamping groove 10 after the.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments still fall within the scope of the technical solution of the present invention.

Claims (5)

1. The utility model provides a neutral point grounding resistance cabinet of medium voltage electric network, includes the cabinet body and resistance, the box structure of the cabinet body for being provided with the switch door, the top of the cabinet body is run through and is set up wall bushing, characterized by: the resistance is for being parallel to each other and the three group's of level setting on the support, and connects through first insulating stand between three group's resistances, the support includes upper bracket and lower carriage, and is provided with the insulating stand of second between resistance and upper bracket and the lower carriage, and cabinet side wall sets up the vent, just the vent inboard is provided with the spacing draw-in groove of bar, spacing draw-in groove inside is provided with the filter screen.

2. The medium voltage power grid neutral grounding resistor cabinet according to claim 1, characterized in that: the filter screen is provided with all around slide and spacing plastics frame in the spacing draw-in groove of bar, and plastics frame and filter screen structure as an organic whole, the filter screen is the dacron filter screen.

3. The medium voltage power grid neutral grounding resistor cabinet according to claim 1, characterized in that: the bar-shaped limiting clamping groove is embedded into the wall of the cabinet body at the position of the vent, the top of the bar-shaped limiting clamping groove is provided with a slope, and the bottom of the bar-shaped limiting clamping groove is provided with a flow guide hole communicated with the air outside the cabinet body.

4. The medium voltage power grid neutral grounding resistor cabinet according to claim 1, characterized in that: the first insulating upright post is a 60 insulating upright post, and the second insulating upright post is a 130 insulating upright post.

5. The medium voltage power grid neutral grounding resistor cabinet according to claim 1, characterized in that: the cabinet body top is provided with rack brow and rings, cabinet body bottom is provided with the base.

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