CN87216457U - Adjustable load box of a current mutual inductor - Google Patents

Abstract

The utility model relates to an adjustable load box of a current mutual inductor, comprising a case, a laminated brush switch, an adjustable reactance and an adjustable resistance. The adjustable reactance is composed of four coil groups which are respectively wound on an iron-core and connected in series. The unit values of the coil groups are 1 ohm, 0.1 ohm, 0.01 ohm and 0.001 ohm. The adjustable resistance is composed of 4 resistances which are connected in series. The unit values of the resistances are respectively 1 ohm, 0.1 ohm, 0.01 ohm and 0.001 ohm. Different reactance values and resistance values can be obtained by the rotation of the laminated brush switch. The utility model has the advantages of high precision, little error, wide load range and adjustable power factor. The load can be adjusted according to practical situation. The error can be internally compensated.

Description

Adjustable load box of a current mutual inductor

The utility model belongs to a kind of current transformer load box.The current transformer load box is the requisite instrument of instrument transformer industry.

The current transformer load box of producing has two kinds of versions at present, a kind of is the direct impedance formula, as Fy49 type current transformer load box, a kind of is mutual-inductor type, Fy66 type current transformer load box as the production of mutual inductance device factory, Shanxi, but the impedance component that they adopt is all fixed, and basic structure as shown in Figure 1.The impedance magnitude of each retaining and power factor are all fixed like this.Therefore, just to have only power factor be 1 or 0.8 to the current transformer load box of producing at present.This load box is once because element occurs overproof, can't adjust voluntarily and be compensated, during actual the use, because every retaining load is fixed, can only choose the normal impedance value close with actual value, therefore regardless of different kinds of the impedance of reality still power factor all can not guarantee consistent, thereby cause current transformer calibration accuracy and service precision inconsistent.In light of this situation, increase according to instrument in recent years again simultaneously, power factor is on the low side and during according to the actual use of power department, the power factor of the actual loading of current transformer is neither 1, therefore non-again 0.8 situation, is badly in need of a kind of adjustable current transformer load box.

The purpose of this utility model just provides a kind of impedance and power factor all is adjustable adjustable current transformer load box.

This adjustable current transformer load box is made up of casing, laminated brush switch, regulative reactance and adjustable resistance.Regulative reactance is to be in series by 4 coiling groups on the iron core respectively as shown in Figure 2, and the unit value of every coiling group is respectively 1 Ω, 0.1 Ω, 0.01 Ω, 0.001 Ω, adjustable resistance is in series by 4 dish resistance, and the unit value of every dish is respectively 1 Ω, 0.1 Ω, 0.01 Ω, 0.001 Ω.The regulative reactance winding by multiple conducting wires and around, the first coiling component on the iron core is 5 sections, and 6 taps are arranged, second dish to the winding of the 4th dish all is divided into 10 sections, and 11 taps are respectively arranged, connection of each dish connects by laminated brush switch.Concrete method of attachment: first section lead termination is connected with laminated brush switch movable head on the first coiling group in the second coiling group, first section lead termination is connected with laminated brush switch movable head on the 3rd coiling group in the 3rd coiling group, and first section lead termination is connected with laminated brush switch movable head on the 3rd coiling group in the 4th coiling group.Adjustable resistance forms with the coiling of even number root enamel-cover manganese-copper filament, half head and all the other half tail alter-parallel of lead, and it is zero so just to make inductance approach.First dish is in series by 5 resistance, and each resistance value is all 1 Ω, and 6 taps are arranged.The 2nd dish resistance has 10 resistance to be in series, and each resistance value is all 0.1 Ω, and 11 taps are arranged.The 3rd dish resistance is in series by the resistance that 10 resistance values are all 0.01 Ω, and 11 taps are arranged, and the 4th dish resistance is in series by the resistance that 10 resistance values are all 0.001 Ω, and 11 taps are arranged, and the connection of each dish connects by laminated brush switch.As shown in Figure 3.The iron core of regulative reactance adopts the iron core of band air gap, cause reactance value to change for preventing that air gap from changing, iron core is added with copper sheathing and irritates wax, the reactance winding adopt multiple conducting wires and around, can set up reactance value by the number of turn of adjusting one or a few lead like this, thereby make the error minimum of reactance value.For guaranteed capacity is enough, laminated brush switch is selected four-layer switch for use, when the turn laminated brush switch to diverse location, will connect different taps so, so just can obtain different resistance and reactance value.

According to formula:

Z＝ $\sqrt{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="87216457\_DRIMG1.png"\; state="\{\{state\}\}">R</figure-callout>}{}^2\mathrm{+<figure-callout\; id="2"\; label="X"\; filenames="87216457\_DRIMG1.png"\; state="\{\{state\}\}">X</figure-callout>}{}^2}$ COSφ＝R／Z

Wherein Z is that impedance, R are that resistance, X are that reactance, COS φ are power factor.So just obtain different impedances and power factor, thereby reach impedance and power factor is adjustable purpose.

The utlity model has following advantage:

The accuracy height; Loading range is big; Power factor is adjustable; Be convenient to adjust load (comprising size and power factor) by actual conditions; Error can internal compensation.Because resistance and reactance on the make, will inevitably have fabrication error, but the error of high value dish can compensate by adjusting the low value dish, and error is just mainly come definitely by last two dishes like this, thereby the error of load box will reduce greatly.

Below with reference to accompanying drawing the utility model is described in further detail.

Fig. 1 is a Fy66 type current transformer load box schematic diagram.

Fig. 2 is a structure chart of the present utility model.

---casing 2---laminated brush switch wherein: 1

3---regulative reactance 4---adjustable resistance

Fig. 3 is a schematic diagram of the present utility model.

Embodiment of the present utility model:

8 laminated brush switches are installed on the cabinet panel, and 4 laminated brush switches are connected with regulative reactance, and 4 laminated brush switches are connected with adjustable resistance, and regulative reactance is in series by 4 coiling groups on the iron core respectively.First dish is X ₁, core material is a cold-reduced silicon sheet, and specification is φ 80/ φ 145 * 40, and saw kerf 4mm adds the copper sheathing insulation.

Winding a ₁a ₂The lead that is 2 φ 2 is around 109 circles,

Winding a ₂a ₃The lead that is 2 φ 2 is around 45 circles,

Winding a ₃a ₄The lead that is 2 φ 2 is around 34 circles,

Winding a ₄a ₅The lead that is 2 φ 2 is around 29 circles,

Winding a ₅a ₆The lead that is 2 φ 2 is around 26 circles,

The 2nd dish is X ₂, core material is a cold-reduced silicon sheet, and specification is φ 80/ φ 105 * 30, and saw kerf 4mm adds the copper sheathing insulation.

Winding a ₁a ₂The lead that is 2 φ 2 is around 51 circles,

Winding a ₂a ₃The lead that is 2 φ 2 is around 21 circles,

Winding a ₃a ₄The lead that is 2 φ 2 is around 17 circles,

Winding a ₄a ₅The lead that is 2 φ 2 is around 14 circles,

Winding a ₅a ₆The lead that is 2 φ 2 is around 12 circles,

Winding a ₆a ₇The lead that is 2 φ 2 is around 11 circles,

Winding a ₇a ₈The lead that is 2 φ 2 is around 10 circles,

Winding a ₈a ₉The lead that is 2 φ 2 is around 9 circles,

Winding a ₉a ₁₀The lead that is 2 φ 2 is around 9 circles,

Winding a ₁₀a ₁₁The lead that is 2 φ 2 is around 8 circles,

The 3rd dish is X ₃, core material is a cold-reduced silicon sheet, specification is φ 60/ φ 75 * 20 saw kerf 2mm, adds the copper sheathing insulation.

Winding a ₁a ₂The lead that is 2 φ 2 is around 26 circles,

Winding a ₂a ₃The lead that is 2 φ 2 is around 10 circles,

Winding a ₃a ₄The lead that is 2 φ 2 is around 8 circles,

Winding a ₄a ₅The lead that is 2 φ 2 is around 7 circles,

Winding a ₅a ₆The lead that is 2 φ 2 is around 6 circles,

Winding a ₆a ₇The lead that is 2 φ 2 is around 6 circles,

Winding a ₇a ₈The lead that is 2 φ 2 is around 5 circles,

Winding a ₈a ₉The lead that is 2 φ 2 is around 4 circles,

Winding a ₉a ₁₀The lead that is 2 φ 2 is around 5 circles,

Winding a ₁₀a ₁₁The lead that is 2 φ 2 is around 4 circles,

The 4th dish is X ₄, core material is a cold-reduced silicon sheet, and specification is φ 50/ φ 56 * 20, and saw kerf 5mm adds the copper sheathing insulation.

Winding a ₁a ₂The lead that is 6 φ 1.45 is around 7 circles,

Winding a ₂a ₃The lead that is 6 φ 1.45 is around 3 circles,

Winding a ₃a ₄The lead that is 6 φ 1.45 is around 3 circles,

Winding a ₄a ₅The lead that is 6 φ 1.45 is around 3 circles,

Winding a ₅a ₆The lead that is 6 φ 1.45 is around 2 circles,

Winding a ₆a ₇The lead that is 6 φ 1.45 is around 2 circles,

Winding a ₇a ₈The lead that is 6 φ 1.45 is around 2 circles,

Winding a ₈a ₉The lead that is 6 φ 1.45 is around 1 1/2 circles,

Winding a ₉a ₁₀The lead that is 6 φ 1.45 is around 1 1/2 circles,

Winding a ₁₀a ₁₁The lead that is 6 φ 1.45 is around 1 1/3 circles,

Adjustable resistance is in series by 4 dish resistance, and the 1st dish is R ₁, with 2 of the manganese-copper filaments of φ 2 and on the gummed paper pipe of φ 10 * 200, lift one's head and intersect and connect, line length 13.7m, quantity is five.The 2nd dish is R ₂,, lift one's head and intersect and meet line length 1.37m, totally ten with the manganese-copper filament of 2 φ 2 and on the gummed paper pipe of φ 10 * 60.

The 3rd dish is R ₃,, lift one's head and intersect and meet line length 0.137m, totally ten with the manganese-copper filament of 2 φ 2 and on bakelite plate.

The 4th dish is R ₄,, lift one's head and intersect and meet line length 0.0137m, totally ten with the manganese-copper filament of 2 φ 2 and on bakelite plate.

Resistance, reactance are all set up by corresponding 1,0.1,0.01,0.001 Ω, and error is less than 2%.In fact the current transformer load box global error of Zhi Zuoing does not surpass 1% like this.

Claims (3)

1, a kind of a kind of adjustable current transformer load box of forming by casing (1), laminated brush switch (2), regulative reactance (3) and adjustable resistance (4), it is characterized in that regulative reactance is to be in series by four coiling groups on the iron core respectively, and the unit value of every coiling group is respectively 1 Ω, 0.1 Ω, 0.01 Ω, 0.001 Ω, adjustable resistance is in series by four dish resistance, and the unit value of every dish is respectively 1 Ω, 0.1 Ω, 0.01 Ω, 0.001 Ω.

2, adjustable current transformer load box according to claim 1, it is characterized in that the regulative reactance winding by multiple conducting wires and around, the first coiling component is 5 sections, 6 taps are arranged, second dish to the 4th coiling group all is that each dish is divided into 10 sections, 11 taps are respectively arranged, and the connection of each dish connects by laminated brush switch.

3, adjustable current transformer load box according to claim 1, it is characterized in that adjustable resistance forms with the coiling of even number root enamel-cover manganese-copper filament, lead half head end and all the other half tail end alter-parallel, first dish is in series by 5 resistance, have 6 taps, second dish to the 4th dish resistance all is to be in series by 10 resistance, 11 taps are respectively arranged, the connection of each dish connects by laminated brush switch, and the ohmically laminated brush switch of the 4th dish is connected with the laminated brush switch that reactance winding the 4th coils.

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