CN207068638U - A kind of column support type bus-type current transformer - Google Patents

Abstract

The current measurement in power system and relay protection use device are the utility model is related to, specifically a kind of column support type bus-type current transformer.It is wound on the iron core of circular ring type including the insulator and iron core being packaged in insulator, secondary winding and coil brace wherein secondary winding and is supported by coil brace, insulator is cylindrical structure and is provided with bus hole along axis, and the secondary wiring terminals of secondary winding are drawn by the outer surface of insulator.The utility model is formed using epoxide resin vacuum cast, with the advantages of compact-sized, easy for installation, creep age distance is big, insulation grade anti-corrosion is high, electric fields uniform, transient characterisitics are good, measuring accuracy is high, its every technical performance fully meets domestic big-and-middle-sized power-plant engineering and uses needs.

Description

A kind of column support type bus-type current transformer

Technical field

The current measurement in power system and relay protection use device are the utility model is related to, specifically a kind of branch Pillar bus-type current transformer.

Background technology

Power plant enclosed busbar is generator lead-out wire loop current transmission equipment, supporting with it as big power supply lead wire Bus-type current transformer used primarily as current measurement, differential, transient protection, according to power plant design and generating set Watt level is distinguished, and the structure design form of bus generally includes isolated-phase enclosed bus, altogether case enclosed busbar, split-phase closing mother Line, open wide bus.For relatively, the working condition of unlimited bus structure is more harsh, and supporting high-tension apparatus must have Have the moisture adapted under operation environment, dust effect and product itself that there is good shielding measure, reduce contaminant flashover and Earth fault, prevent personal Danger Electric shock risk etc., improve the application safety of equipment, meet that domestic various big-and-middle-sized power plant use need Ask.

Utility model content

In view of the above-mentioned problems, the purpose of this utility model is to provide a kind of column support type bus-type current transformer, with solution The easy moisture absorption of certainly existing bus open-type current transformer used in power plant, creep age distance are less than normal, pollution flashover, earth fault etc. easily occurs Problem.

To achieve these goals, the utility model uses following technical scheme：

A kind of column support type bus-type current transformer, including insulator and the iron core, secondary that is packaged in the insulator Winding and coil brace, wherein secondary winding are wound on the iron core of circular ring type and supported by coil brace, the insulation Body is cylindrical structure and is provided with bus hole along axis, and the secondary wiring terminals of the secondary winding are by the outer of the insulator Draw on surface.

The insulator is the integral structure using poured with epoxy resin.

The coil brace is loop configuration, circumferentially arranged with multiple embedded nuts on the excircle of the coil brace, The embedded nut is embedded in the insulator.

The secondary winding is two groups and is located at the both sides of the coil brace respectively, and two groups of secondary windings twine respectively It is around on two iron cores.

The outer surface center of the insulator is provided with secondary connection platform, and the secondary wiring terminals are located at secondary connection On platform.

The secondary connection platform is rectangular parallelepiped structure and is integral type structure with the insulator.

Multiple concentric circular full skirts are provided with the both ends end face of the insulator from inside to outside.

Bus hole inwall is provided with semi-conductive layer.

Helical spring is arranged with the inwall in the bus hole.

The insulator is in the horizontal direction on the base of arcuate structure.

The utility model has the following advantages that and beneficial effect：

1. the utility model is compact-sized, easy for installation：Cylinder insulator structure is formed using poured with epoxy resin, it is overall On aluminum base, structure is compacter, easy for installation, and epoxy resin external insulation ensures in moisture, condensation environment not Insulation degradation occurs, this product also it is female directly can be installed on closing without mounting seat, i.e. product using four embedded nuts Inside line, used as enclosed busbar formula transformer.

2. the utility model creep age distance is big, insulation grade anti-corrosion is high：Cylinder insulator both sides end face is outwards equal from center The even full skirt provided with several concentric circles, effectively increase the insulation distance of product high-voltage busbar baffle over the ground；And inner wire Loop material all using F class F insulating material Fs, makes the insulation grade anti-corrosion of product higher.

3. the utility model electric fields uniform, transient characterisitics are good, measuring accuracy is high：Circular busbar hole periphery is painted with semiconductive Layer is used as high pressure equipotential layer, and electric fields uniform has been effectively ensured；Internal secondary winding employs the transient protection measure of aerating gap And shield winding measure, product has good transient characterisitics and accurate measurement under application, overall to ensure electric power factory equipment peace Row for the national games.

Brief description of the drawings

Fig. 1 is structural representation of the present utility model；

Fig. 2 is Fig. 1 side view；

Fig. 3 is internal structure schematic diagram of the present utility model.

In figure：1 is iron core, and 2 be secondary winding, and 3 be coil brace, and 4 be secondary connection platform, and 5 be insulator, and 6 be base, 7 be embedded nut, and 8 be full skirt, and 9 be bus hole, and 10 be semi-conductive layer, and 11 be helical spring.

Embodiment

In order that the purpose of this utility model, technical scheme and advantage are clearer, below in conjunction with the accompanying drawings and it is embodied The utility model is described in detail example.

As Figure 1-3, a kind of column support type bus-type current transformer provided by the utility model, including insulator 5 and Iron core 1, secondary winding 2 and the coil brace 3 being packaged in insulator 5, wherein secondary winding 2 are wound in the iron core 1 of circular ring type Above and by coil brace 3 support, insulator 5 is cylindrical structure and is provided with bus hole 9 along axis, secondary winding 2 Secondary wiring terminals are drawn by the outer surface of insulator 5.

Insulator 5 is the integral structure using poured with epoxy resin, has the anti-condensation performance of anti-moisture.Coil brace 3 For loop configuration, insulator 5 is embedded at circumferentially arranged with multiple embedded nuts 7, embedded nut 7 on the excircle of coil brace 3 It is interior.

Secondary winding 2 is two groups and is located at the both sides of coil brace 3 respectively, and two groups of secondary windings 2 are wound in two respectively On individual iron core 1.

The outer surface center of insulator 5 is provided with secondary connection platform 4, and secondary wiring terminals are located on secondary connection platform 4. Secondary connection platform 4 is rectangular parallelepiped structure and is integral type structure with insulator 5.It is secondary when secondary connection platform 4 is conveniently installed The connection and extraction of cable.

Multiple concentric circular full skirts 8 are provided with the both ends end face of insulator 5 from inside to outside.

The inwall of bus hole 9 is painted with semi-conductive layer 10.

Helical spring 11 is arranged with the inwall in bus hole 9.

(axis is in horizontal layout) is arranged on the base 6 of arcuate structure insulator 5 in the horizontal direction, and base 6 uses aluminium Material.

In an embodiment of the present utility model, insulator 5 it is cylindrical on be along the circumferential direction laid with four embedded nuts 7, embedded nut 7 and coil brace 3 are integral type structure.On insulator 5 underlying two embedded nuts 7 by bolt with Base 6 connects.

The utility model also it is female directly can be installed on closing without mounting seat, i.e. insulator 5 using four embedded nuts 7 Inside line, i.e., used but also as enclosed busbar formula transformer.

The circular busbar hole 9 of the inner chamber of insulator 5 is for high-voltage busbar baffle by the way that periphery is painted with the conduct of semi-conductive layer 10 High pressure equipotential layer, its central upper and bottom are respectively provided with helical spring 11, i.e., as with high-voltage busbar baffle tie point, Ensure to contact reliable, electric fields uniform.

Manufacture craft process of the present utility model is：

The iron core 1 of annular handled by dipping lacquer is cut into two semicircles through special equipment, adjusts between its opening Gap simultaneously bundlees the iron core 1 that the enamel-covered wire of secondary winding 2 integrally, is equably wound on to circular ring type respectively using special coil winding machine On, and aid in wrapping up insulating materials, the insulating materials such as the materials such as the insulated paint of H levels, outsourcing polyimides gluing film is impregnated, from And form an electric current device body for carrying secondary wiring terminals.Same electric current device body two, respectively and polyester is without latitude splicing tape It is bundled in after buffering is wrapped up on coil brace 3；The excircle uniform welding of making toroidal coil support 3 has four embedded nuts 7；After related drying and processing, coil device body is transferred to pouring hall and carries out die-filling process, first by the die-filling tool of coil device body Between, adjust that the distance on periphery is uniform, be fixed on the positioning, connected secondary with mould using four embedded nuts 7 of coil brace 3 Lead matched moulds；Poured into a mould using epoxide resin vacuum and be solidified into the insulator 5 of cylindrical structure, the insulator 5 of cylindrical structure is axle Line integral installation in horizontal direction is designed with mounting hole thereon on aluminum base 6, is used for in-site installation；Four setting-in spiral shells Two in mother 7 positioned at bottom are fixed with aluminum base 6 using bolt, and this product also can be directly sharp without mounting seat, product It is installed on inside enclosed busbar, i.e., is used but also as enclosed busbar formula transformer with four embedded nuts 7；The both ends of insulator 5 End face is outwards uniformly provided with the full skirt 8 of several concentric circles from center, effectively increases product high-voltage busbar baffle over the ground exhausted Edge distance, will not because of dust, moisture and occur pollution flashover electric discharge etc. Insulation Problems；The inner chamber of cylinder insulator 5 is circular busbar hole 9 For high-voltage busbar baffle by the way that periphery is painted with semi-conductive layer 10 and is used as high pressure equipotential layer, its central upper and lower part Not Zhuan You helical spring 11, i.e., as with high-voltage busbar baffle tie point, ensure that contact is reliable, electric fields uniform；Secondary connection Platform 4 is rectangular parallelepiped form, connection and extraction positioned at the middle part center of insulator 5, conveniently secondary cable during installation.

Installation site of the present utility model is in the unlimited bus device in power plant, during in-site installation, first with aluminum bottom Seat 6 is directly anchored to installation site, then enters high-voltage busbar baffle after adjusting uniformly with shielding spring by bus hole 9 Row current potential connects, and finally carries out the electrical connection of secondary lead wires, that is, completes installation.

Bus open-type current transformer used in power plant provided by the utility model is designed fully according to national standard A kind of new product, using iron core is rolled, using electromagnetic conversion and transient characterisitics principle, enable secondary current reflected measurement exactly Situations such as insulation of primary current and high voltage bus, secondary measurement and control device are transferred to, are protected as current measurement and relay Shield uses.

In summary, the utility model using epoxide resin vacuum cast form, have it is compact-sized, easy for installation, climb The advantages of electrical distance is big, insulation grade anti-corrosion is high, electric fields uniform, transient characterisitics are good, measuring accuracy is high, its every technical performance are complete The full up domestic big-and-middle-sized power-plant engineering of foot, can complete import substitutes using needs.

Embodiment of the present utility model is the foregoing is only, is not intended to limit the scope of protection of the utility model.It is all Made within spirit of the present utility model and principle any modification, equivalent substitution and improvements, extension etc., are all contained in this reality With in new protection domain.

Claims (10)

1. a kind of column support type bus-type current transformer, it is characterised in that including insulator (5) and be packaged in the insulator (5) iron core (1), secondary winding (2) and coil brace (3) in, wherein secondary winding (2) are wound in the iron core (1) of circular ring type Above and by coil brace (3) support, the insulator (5) is cylindrical structure and is provided with bus hole (9) along axis, institute The secondary wiring terminals for stating secondary winding (2) are drawn by the outer surface of the insulator (5).

2. column support type bus-type current transformer according to claim 1, it is characterised in that the insulator (5) is to adopt With the integral structure of poured with epoxy resin.

3. column support type bus-type current transformer according to claim 2, it is characterised in that the coil brace (3) is Loop configuration, it is embedding circumferentially arranged with multiple embedded nuts (7), the embedded nut (7) on the excircle of the coil brace (3) In the insulator (5).

4. column support type bus-type current transformer according to claim 3, it is characterised in that the secondary winding (2) is Two groups and it is located at the both sides of the coil brace (3) respectively, two groups of secondary windings (2) are wound in two iron cores (1) respectively On.

5. column support type bus-type current transformer according to claim 2, it is characterised in that outside the insulator (5) Centre of surface position is provided with secondary connection platform (4), and the secondary wiring terminals are located on secondary connection platform (4).

6. column support type bus-type current transformer according to claim 5, it is characterised in that the secondary connection platform (4) It is integral type structure for rectangular parallelepiped structure and with the insulator (5).

7. column support type bus-type current transformer according to claim 2, it is characterised in that the two of the insulator (5) Hold and be provided with multiple concentric circular full skirts (8) on end face from inside to outside.

8. column support type bus-type current transformer according to claim 2, it is characterised in that bus hole (9) inwall Provided with semi-conductive layer (10).

9. column support type bus-type current transformer according to claim 2, it is characterised in that the bus hole (9) it is interior Helical spring (11) is arranged with wall.

10. according to the column support type bus-type current transformer described in claim any one of 1-9, it is characterised in that the insulation Body (5) is in the horizontal direction on the base (6) of arcuate structure.