The voltage sampling device
Technical field
The application relates to the power technology field, particularly relates to a kind of voltage sampling device.
Background technology
Along with the accuracy of electronic electric energy meter, mutual inductor improves constantly, the voltage drop that produces on the voltage transformer secondary loop has become the principal element that influences electric energy metering error.
Require according to DL/T448-2000 " electric power meter technical management rules " third part interpretation of section 7.3 field tests: operating voltage transformer secondary loop voltage is fallen and should regularly be tested.35kV and above voltage transformer secondary loop voltage are fallen, and check at least every two years once.Should in time ascertain the reason when overproof when secondary circuit load surpasses the specified secondary load of mutual inductor or secondary circuit voltage drop, and in one month, handle.The electric power meter voltage transformer secondary loop voltage that I, II class are used for trade settlement is fallen and should be not more than 0.2% of its rated secondary voltage; The voltage transformer secondary loop voltage is fallen and should be not more than 0.5% of its rated secondary voltage in other electric power meters.
Existing traditional secondary pressure fall-off test, voltage transformer (VT) side secondary voltage need terminal row from the PT terminal box with crocodile clip sampling voltage signal.The crocodile clip utmost point is not easy with the voltage terminal folder steady, and this voltage sampling mode might cause voltage circuit short circuit or ground connection, even can cause personal injury accidents, if under extreme case, also possibly cause power grid accident.Simultaneously, through measuring crocodile clip top and voltage terminal metal contact area≤2mm
2, promptly when test, crocodile clip and voltage terminal surface of contact are little, and it is unreliable to contact, and possibly introduce the test additive error.
Summary of the invention
In view of this, the application embodiment provides a kind of voltage sampling device, and is existing when secondary voltage drop is tested to solve, and voltage transformer (VT) side secondary voltage needs terminal row from the PT terminal box with the existing problem of crocodile clip sampling voltage signal.
To achieve these goals, the technical scheme that provides of the application embodiment is following:
A kind of voltage sampling device comprises: base and bolt-type contactor, wherein:
Said base is provided with the jack of a plurality of spaces and insulation, and in base, is provided with position and the corresponding one by one matrix metal spring of a plurality of jack positions sheet;
Each said matrix metal spring sheet and the relative end of said jack are provided with elastic opening, and the end away from said jack of each said matrix metal spring sheet is provided with voltage and inserts terminal;
Said bolt-type contactor is provided with the Metal Contact sheet that a plurality of and said jack is complementary, and insulate between adjacent two Metal Contact sheets;
One end of each said Metal Contact sheet is positioned at the outside of said bolt-type contactor, and the other end is fixed on the inside of said bolt-type contactor, and the other end of each said Metal Contact sheet is provided with voltage output end.
Preferably, the matrix flexure strip comprises described in this voltage sampling device: two U matrix, wherein:
The length of the U type both sides of two said U matrix is different;
Two long sides of said U matrix length are fixed together, and two short sides of said U matrix length are positioned at the inboard, and two short sides of U matrix length contact.
Preferably, two said U matrix length all are connected with an arc in the end of a long side in this voltage sampling device;
Two the said U matrix length said arc of a long side is fixed together, and makes the short side of two said U matrix length parallel and contact.
Preferably, it is stud terminal that voltage described in this voltage sampling device inserts terminal, and each stud terminal respectively with a said matrix metal spring sheet in the end that fixes of two said U types be connected.
Preferably, described in this voltage sampling device on the base a plurality of jacks separately be positioned on the side of said base, and the interval between adjacent two said jacks equates.
Preferably, the xsect of a plurality of said jacks is rectangle in this voltage sampling device, and the end face of the major axis of a plurality of said jack rectangular cross sections and said base parallels, and is located on the same line.
Preferably, state in this voltage sampling device on the bottom surface of base and be provided with draw-in groove with said jack place lateral ends, said draw-in groove is used for said base is fixed.
Preferably, the material of matrix metal spring sheet is a beryllium copper described in this voltage sampling device.
Preferably, base and bolt-type contactor are the insulating material injection mo(u)lding described in this voltage sampling device.
Preferably, insulating material is the polyphosphazene polymer carbonic ester described in this voltage sampling device.
Visible by above technical scheme; This voltage sampling device that the application embodiment provides is when obtaining PT side secondary voltage signal; Only need Metal Contact sheet with the bolt-type contactor be inserted in the jack of base and get final product, when testing, simple to operation; Thereby can place problems such as false wiring, voltage short circuit, realize the safe voltage sampling.
And; Base in this voltage sampling device is with after the bolt-type contactor is connected, and the contact area between Metal Contact sheet and the matrix metal spring sheet is bigger, has increased contact area; Also just mean and to reduce contact resistance; Reduced the increase of test impedance, and and then can improve measuring accuracy, avoid introducing the test additive error.
Description of drawings
In order to be illustrated more clearly in the application embodiment or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiment that put down in writing among the application, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The base of the voltage sampling device that Fig. 1 provides for the application embodiment and the structural representation that the bolt-type contactor is separated;
Structural representation when the base of the voltage sampling device that Fig. 2 provides for the application embodiment and bolt-type contactor insert;
Structural representation after the base of the voltage sampling device that Fig. 3 provides for the application embodiment and bolt-type contactor insert;
The base of the voltage sampling device that Fig. 4 provides for the application embodiment and the sectional structure synoptic diagram that the bolt-type contactor is separated;
Sectional structure synoptic diagram when the base of the voltage sampling device that Fig. 5 provides for the application embodiment and bolt-type contactor insert;
Sectional structure synoptic diagram after the base of the voltage sampling device that Fig. 6 provides for the application embodiment and bolt-type contactor insert.
Embodiment
In order to make those skilled in the art person understand the technical scheme among the application better; To combine the accompanying drawing among the application embodiment below; Technical scheme among the application embodiment is carried out clear, intactly description; Obviously, described embodiment only is the application's part embodiment, rather than whole embodiment.Based on the embodiment among the application, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all should belong to the scope of the application's protection.
The base of the voltage sampling device that Fig. 1 provides for the application embodiment and the structural representation that the bolt-type contactor is separated.
As shown in Figure 1; This voltage sampling device comprises: base 1 and bolt-type contactor 6; Wherein: base 1 is provided with a plurality of jacks 3, and bolt-type contactor 6 is provided with and a plurality of one to one Metal Contact sheets 4 of a plurality of jacks 3, in use; Metal Contact sheet 4 can be inserted in the jack; As shown in Figures 2 and 3, the base of the voltage sampling device that the structural representation the when base of the voltage sampling device that Fig. 2 provides for the application embodiment and bolt-type contactor insert, Fig. 3 provide for the application embodiment and the structural representation after the insertion of bolt-type contactor.
In the application embodiment, a plurality of jacks 3 are positioned on the side of base 1, and are provided with between a plurality of jack 3 at interval, and insulation mutually between adjacent two jacks 3, preferably, manufacture for ease, and the interval between adjacent two jacks 3 can equate.
In addition, for ease Metal Contact sheet 4 is inserted in the base 1, the xsect of a plurality of jacks 3 is rectangle, and promptly jack 3 is a slot.The major axis of a plurality of jack 3 rectangular cross sections and the end face of base 1 parallel, and the major axis of a plurality of jack 3 rectangular cross sections is positioned on same the straight line, and promptly a plurality of jacks 3 laterally arrange on the side of base 1.In like manner; On the side that also is arranged on bolt-type contactor 6 of a plurality of Metal Contact sheets 4 that are provided with on the bolt-type contactor 6; A plurality of Metal Contact sheet 4 one ends are positioned at the outside of bolt-type with regard to contactor 6, and the other end is fixed on the inside of bolt-type contactor 6, and are connected with voltage output end 8.In addition, a plurality of Metal Contact sheets 4 are complementary with the position of jack 3.When needs are connected bolt-type contactor 6 with base 1, can conveniently Metal Contact sheet 4 be inserted in the jack 3 like this, thereby can place problems such as false wiring, voltage short circuit, realize the safe voltage sampling.
Above-mentioned position distribution about jack 3; And the distribution that is as the criterion of Metal Contact sheet 4 all is preferred embodiments of the application; Those skilled in the art will be appreciated that; Jack 3 can also distribute with the form of similar three hole plugs, Three-hole socket with the Metal Contact sheet, and these all should belong to the application's protection domain.
The base of the voltage sampling device that Fig. 4 provides for the application embodiment and the sectional structure synoptic diagram that the bolt-type contactor is separated.
As shown in Figure 4; The matrix metal spring sheet 7 one to one in the position of a plurality of positions of the set inside of base 1 and a plurality of jack 3; Each said matrix metal spring sheet 7 is provided with elastic opening 71 with jack 3 relative ends; End away from said jack of each said matrix metal spring sheet is provided with voltage and inserts terminal 72, and voltage inserts terminal 72 can be stud terminal, as shown in Figure 1; This voltage sampling device can be connected voltage terminal 72 when work with PT voltage terminal (A, B, C, N).When base 1 was connected with bolt-type contactor 6, Metal Contact sheet 4 was inserted in the jack 3 like this, and Metal Contact sheet 4 contacts with the elastic opening 71 of matrix metal spring sheet 7 and is connected.
As shown in Figure 4; Matrix metal spring sheet 7 comprises: a U type metal spring sheet 73 and the 2nd U type metal spring sheet 74; Wherein: a U type metal spring sheet 73 is different with the length of the U type both sides of the 2nd U type metal spring sheet 74; And the side that length is long in a U type metal spring sheet 73 and the 2nd U type metal spring sheet 74 is fixed together; And the short side of length is positioned at the inboard in a U type metal spring sheet 73 and the 2nd U type metal spring sheet 74, and the short side of length contacts in a U type metal spring sheet 73 and the 2nd U type metal spring sheet 74.So just make that the short side of length presses together mutually in win U type metal spring sheet 73 and the 2nd U type metal spring sheet 74; Form elastic opening; In the time of promptly in Metal Contact sheet 4 is inserted into jack 3, can be grasped by the elastic opening of U type metal spring sheet 7.
In the application embodiment; The material selection beryllium copper of matrix metal spring sheet 7 is because beryllium copper has the high strength limit suitable with special steel, limit of elasticity; Yield limit and fatigue limit; Possess again simultaneously high conductivity is arranged, high rigidity and wearing quality are so can guarantee the serviceable life of this voltage sampling device.
In addition; In the application embodiment; For win U type metal spring sheet 73 and the 2nd U type metal spring sheet 74 can be pressed together, as shown in Figure 4, be provided with arc 75 at a U type metal spring sheet 73 and the long side end of the 2nd U type metal spring sheet 74 length; Like this when a fixing U type metal spring sheet 73 and the 2nd U type metal spring sheet 74; Can the arc 75 on a U type metal spring sheet 73 and the 2nd U type metal spring sheet 74 be fixed together, and fixing back makes, in a U type metal spring sheet 73 and the 2nd U type metal spring sheet 74 length a side of weak point parallel and contact.Like Fig. 5 and shown in Figure 6, in the time of like this in Metal Contact sheet 4 is inserted into jack 3, Metal Contact sheet 4 can also contact on the plane of a short side with length in a U type metal spring sheet 73, the 2nd U type metal spring sheet 74.
Can know from foregoing description; The voltage sampling device that the application embodiment provides only needs the Metal Contact sheet 4 of bolt-type contactor 6 is inserted in the jack 3 of base 1 when obtaining PT side secondary voltage signal, and contacts with matrix metal spring sheet 7 and to get final product; When test, simple to operation.And the contact area between Metal Contact sheet 4 and the matrix metal spring sheet 7 is bigger, and the contact area in this voltage sampling device that process measurement the application embodiment provides between Metal Contact sheet 4 and the matrix metal spring sheet 7 is more than or equal to 150mm
2, this is 75 times of contact cotton knot that adopt traditional crocodile clip sampling mode, has increased contact area, also just means to reduce contact resistance, has reduced the increase of test impedance, and and then can improve measuring accuracy, avoid introducing the test additive error.
In addition, among the application embodiment base 1 and bolt-type contactor 6 can be injection molded for insulating material, for example can be injection molded for the polyphosphazene polymer carbonate material.In addition; Like Fig. 4-shown in Figure 5, also be provided with draw-in groove 5 in the bottom of base 1, because the material of base 1 is the polyphosphazene polymer carbonate material; So draw-in groove 5 has certain elasticity; When obtaining PT side secondary voltage signal, can utilize draw-in groove 5 that base is fixed on other devices, for example: the PT terminal box like this.
The above only is the application's a preferred implementation, makes those skilled in the art can understand or realize the application.Multiple modification to these embodiment will be conspicuous to one skilled in the art, and defined General Principle can realize under the situation of spirit that does not break away from the application or scope in other embodiments among this paper.Therefore, the application will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.