CN201075334Y - Three-phase zero sequence mutual inductor - Google Patents

Abstract

The utility model discloses a three phase zero sequence transformer with high precision and the shape and size being in accordance with the assembly mode of demarcation load switch. The three phase zero sequence transformer comprises a base (1), a mounting panel (2), an iron core (3), a winding (4), a casting epoxy body (5), A, B, C three phase copper bar and connecting plates (6, 7, 8). The iron core 3 is a square shape or an 'O' shape and is made of high magnetic dense silicon steel sheet by stacking or winding; the winding (4) is wound on the iron core (3); the A, B, C three phase copper bar and the connecting plates (6, 7, 8) are inserted into the window of the iron core (3), the connecting plates (6, 7, 8) are arranged at the two sides of the iron core (3) and the base (1), the mounting panel (2), the iron core (3), the winding (4), the (A, B, C) three phase copper bar and the connecting plates (6, 7, 8) are all cast into a whole by epoxy resin in mould according to technology. The utility model is applied to customer demarcation load switch to ensure the power supply reliability of distribution network.

Description

The three-phase zero-sequence transformer

Technical field

The utility model relates to a kind of three-phase zero-sequence transformer.

Background technology

In China; along with deepening constantly of city net, the upgrading of rural power grids; reliability and fail safe in the power supply in service of power distribution network improve constantly; backbone breaks down and the possibility of accident reduces greatly; at this time the branch line accident causes the ratio of backbone power failure constantly to raise; the branch line fault more and more becomes the principal element that influences the distribution safe operation, happens occasionally because of sole user's fault and protection mismate involve the accident that the whole piece feeder line has a power failure, thereby causes bigger social influence.At present, each user's branch line porch, 10kV overhead distribution place is being used outdoor on-pole switch and isolating switch in a large number, they generally are manual operation, be mainly used in normal branch, the effect of zygonema road load current and insulating power supply, the function that does not have automatic user-isolated side accident, for this reason, the research and development and the production of user demarcation load switch have been drawn, vital parts are three-phase zero-sequence transformer in the demarcation load switch, the precision of the three-phase zero-sequence transformer that tradition is continued to use is lower, insensitive or error is big to little electric current, can not reach the requirement of demarcation load switch technical indicator, the simultaneously body of the three-phase zero-sequence transformer continued to use of tradition and the assembling form that size does not meet demarcation load switch yet are so three-phase zero-sequence transformer of the prior art exists the low and overall dimension of precision not meet the defective of demarcation load switch assembling form.

The utility model content

Technical problem to be solved in the utility model is to overcome the deficiencies in the prior art, provides a kind of precision height and overall dimension to meet the three-phase zero-sequence transformer of demarcation load switch assembling form.

The technical scheme that the utility model adopted is: the utility model is applied on the user demarcation load switch, described user demarcation load switch includes Switch main body, measurement and control unit, connect plug connector, described connection plug connector comprises plug, socket and cable, described Switch main body is electrically connected by the described plug connector that is connected with described measurement and control unit, described Switch main body comprises isolating switch, vacuum load switch, the three-phase zero-sequence transformer, the observing and controlling voltage transformer, the observing and controlling current transformer, described three-phase zero-sequence transformer comprises base, mounting panel, iron core, winding, casting epoxy body, A phase copper bar and connecting plate, B phase copper bar and connecting plate, C phase copper bar and connecting plate, described iron core is " mouth " font or " O " font, form by high-magnetodensity silicon steel plate packing or coiling, described winding technique is on described iron core, described A phase copper bar and connecting plate, B phase copper bar and connecting plate, the copper bar of C phase copper bar and connecting plate interts in the window of described iron core, described A phase copper bar and connecting plate, B phase copper bar and connecting plate, the connecting plate device of C phase copper bar and connecting plate is in described iron core both sides, described base, mounting panel, iron core, winding, A phase copper bar and connecting plate, B phase copper bar and connecting plate, C phase copper bar and connecting plate are cast into one by epoxy resin by technological requirement, described iron core, winding, A phase copper bar and connecting plate, B phase copper bar and connecting plate, C phase copper bar and connecting plate be mutually insulated each other.

The beneficial effects of the utility model are: because the utility model comprises base, mounting panel, iron core, winding, casting epoxy body, A phase copper bar and connecting plate, B phase copper bar and connecting plate, C phase copper bar and connecting plate, described iron core is " mouth " font or " O " font, form by high-magnetodensity silicon steel plate packing or coiling, described winding technique is on described iron core, described A phase copper bar and connecting plate, B phase copper bar and connecting plate, the copper bar of C phase copper bar and connecting plate interts in the window of described iron core, described A phase copper bar and connecting plate, B phase copper bar and connecting plate, the connecting plate device of C phase copper bar and connecting plate is in described iron core both sides, described base, mounting panel, iron core, winding, A phase copper bar and connecting plate, B phase copper bar and connecting plate, C phase copper bar and connecting plate are cast into one by epoxy resin by technological requirement, described iron core, winding, A phase copper bar and connecting plate, B phase copper bar and connecting plate, C phase copper bar and connecting plate be mutually insulated each other, so have the precision height, overall dimension can satisfy the advantage of demarcation load switch assembling form requirement.

Description of drawings

Fig. 1 is a circuit structure block diagram of using user demarcation load switch of the present utility model;

Fig. 2 is the utility model structural representation.

Embodiment

As Fig. 1, shown in Figure 2, the utility model is applied on the user demarcation load switch, described user demarcation load switch includes Switch main body 10, measurement and control unit 11, connect plug connector 12, described connection plug connector 12 comprises plug, socket and cable, described Switch main body 10 is electrically connected by the described plug connector 12 that is connected with described measurement and control unit 11, described Switch main body 10 comprises described three-phase zero-sequence transformer 103 and isolating switch 101, vacuum load switch 102, observing and controlling voltage transformer 104, observing and controlling current transformer 105,106, the input of described isolating switch 101 is connected with the service-wire mains side, the output of described isolating switch 101 connects the input of described zero-sequence transformer 103, the output of described zero-sequence transformer 103 connects the input of described vacuum load switch 102, the output of described vacuum load switch 102 is connected with the input of customer charge side supply and distribution network, described observing and controlling voltage transformer 104 is connected in parallel between the two-phase of service-wire power supply, described observing and controlling current transformer 105, the 106th, punching instrument transformer, described observing and controlling current transformer 105,106 devices are gone up mutually on the both sides of described vacuum load switch 102 outputs.Described measurement and control unit 11 comprises AC sampling module 111, control output module 112, guidance panel 113, communication interface 114 and CPU 115, and described CPU115 is electrically connected with described AC sampling module 111, control output module 112, guidance panel 113, communication interface 114.

Three-phase zero-sequence transformer 103 described in the utility model comprises base 1, mounting panel 2, iron core 3, winding 4, casting epoxy body 5, A phase copper bar and connecting plate 6, B phase copper bar and connecting plate 7, C phase copper bar and connecting plate 8, described iron core 3 is " mouth " font or " O " font, form by high-magnetodensity silicon steel plate packing or coiling, described winding 4 is wound on the described iron core 3, described A phase copper bar and connecting plate 6, B phase copper bar and connecting plate 7, the copper bar of C phase copper bar and connecting plate 8 interts in the window of described iron core 3, described A phase copper bar and connecting plate 6, B phase copper bar and connecting plate 7, the connecting plate device of C phase copper bar and connecting plate 8 is in described iron core 3 both sides, described base 1, mounting panel 2, iron core 3, winding 4, A phase copper bar and connecting plate 6, B phase copper bar and connecting plate 7, C phase copper bar and connecting plate 8 are cast into one by technological requirement, described iron core 3 by epoxy resin, winding 4, A phase copper bar and connecting plate 6, B phase copper bar and connecting plate 7, C phase copper bar and connecting plate 8 be mutually insulated each other.Described base 1 and mounting panel 2 can be whole a pressure with the iron plate blunderbuss and form, described winding 4 can be prefabricated into the coil device of surface insulation on described iron core 3, the available moulds of industrial equipment of whole assembling are fixed above-mentioned each parts by the designing requirement relative position, be placed in the outer casing mold then and cast.Profile of the present utility model and size design for described user demarcation load switch specially, have the advantage that precision height, overall dimension can satisfy the requirement of demarcation load switch assembling form.

The utility model user demarcation load switch is the brand-new outdoor primary line way switch equipment of a kind of function.Load switch body adopts vacuum load switch, SF ₆Gas-insulated.Vacuum tube series connection interlock isolation switch, disconnecting link closes a floodgate prior to vacuum tube, and the back is in the vacuum tube separating brake.The common CT of the built-in two-phase of Switch main body (A, C phase), 1 zero sequence CT, 1 alternate PT.The controller outward appearance adopts the form of present RTU, hardware mainly is provided with panel and is formed by CPU board, power supply and switch control board, parameter, it is mainly used between the responsibility separation of 10kV overhead distribution and user's branch line, prevent that the user side accident from feeding through to the power distribution circuit, cause the accident of large-area power-cuts in the electric power networks, thereby guarantee the power supply reliability of distribution network.

Claims (1)

1. three-phase zero-sequence transformer that is used on the user demarcation load switch, described user demarcation load switch includes Switch main body (10), measurement and control unit (11), connect plug connector (12), described connection plug connector (12) comprises plug, socket and cable, described Switch main body (10) is electrically connected by the described plug connector (12) that is connected with described measurement and control unit (11), described Switch main body (10) comprises isolating switch (101), vacuum load switch (102), described three-phase zero-sequence transformer (103), observing and controlling voltage transformer (104), observing and controlling current transformer (105,106), it is characterized in that: described three-phase zero-sequence transformer (103) comprises base (1), mounting panel (2), iron core (3), winding (4), casting epoxy body (5), A phase copper bar and connecting plate (6), B phase copper bar and connecting plate (7), C phase copper bar and connecting plate (8), described iron core (3) is " mouth " font or " O " font, form by high-magnetodensity silicon steel plate packing or coiling, described winding (4) is wound on the described iron core (3), described A phase copper bar and connecting plate (6), B phase copper bar and connecting plate (7), the copper bar of C phase copper bar and connecting plate (8) interts in the window of described iron core (3), described A phase copper bar and connecting plate (6), B phase copper bar and connecting plate (7), the connecting plate device of C phase copper bar and connecting plate (8) is in described iron core (3) both sides, described base (1), mounting panel (2), iron core (3), winding (4), A phase copper bar and connecting plate (6), B phase copper bar and connecting plate (7), C phase copper bar and connecting plate (8) are integral according to die casting by technology by epoxy resin, described iron core (3), winding (4), A phase copper bar and connecting plate (6), B phase copper bar and connecting plate (7), C phase copper bar and connecting plate (8) be mutually insulated each other.

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