CN103325556A - Novel high voltage standard integrated voltage transformer - Google Patents

Abstract

The invention discloses a novel high voltage standard integrated voltage transformer. The novel high voltage standard integrated voltage transformer comprises a coil which is formed by a primary winding group and a secondary winding group which wrap an R type iron core; the secondary winding group is a secondary winding group with a tap; the number of windings of the primary winding group and the number of windings of the secondary winding group are determined according to a 220 KV standard voltage transformer; the number of windings of the secondary winding group of a 110 KV standard voltage transformer is determined according to the number of windings of the secondary winding group; the number of windings of the secondary winding group of the 110 KV standard voltage transformer is twice of the number of windings of the secondary winding group of the 220 KV standard voltage transformer. According to the novel high voltage standard integrated voltage transformer, the two grades of 110 KV and 220 KV voltage transformers can be simultaneously measured, so that measuring devices are reduced and devices do not need to be frequently replaced during testing; the R type iron core which is made of high flux density and low loss materials is utilized, so that a magnetic circuit is good and the stability is high; insulation and the distribution uniformity of an electric field are considered in the design of the coil, magnetic flux leakage is small, and accuracy grades achieve 0.01.

Description

Novel all-in-one high voltage standard voltage transformer

Technical field

The present invention is a kind of Special high-voltage standard potential transformer, is the part of electric-power metering checkout gear, belongs to high voltage T ﹠ D Technology field.

Background technology

Voltage transformer is the important component part of electric energy metrical, and its accuracy has played important function for the trade settlement that sends electricity and power supply department, therefore must detect it.

Standard potential transformer as the check voltage transformer is related to measurement accuracy, so its accuracy requirement is high, and linear the requirement, zero load and load error are little, and it is high that stability is wanted.

The standard potential transformer electric pressure is corresponding with electric power system primary equipment electric pressure, be divided into 6kV, 10kV, 35kV, 110kV, 220kV, 500kV, 750kV, 1000kV etc., the accuracy of standard potential transformer is high, and 0.05 grade, 0.02 grade, 0.01 grade, 0.005 grade and 0.002 grade etc. are generally arranged; 110kV and 220kV are present common electric pressures, and the probability of instrument transformer that needs simultaneously to measure these two grades is very big, we generally can use respectively the standard potential transformer of 110kV and 220kV to detect, the equipment of measuring like this is many, and more the process of exchange device is complicated during test, and workload is large, also there is the standard potential transformer of some 220kV grades can take into account the voltage transformer of measuring the 110kV grade, but the accuracy of measuring is not high, and volume is large, and weight is not light yet.

Summary of the invention

The purpose of this invention is to provide a kind of novel integrated high-pressure standard potential transformer, it is lightweight, and its accuracy is high.

In order to achieve the above object, the technical solution adopted for the present invention to solve the technical problems:

The present invention is in the same place the design of 110kV0.01 grade standard voltage transformer and 220kV0.01 grade standard voltage transformer, totally one winding once, secondary tap design.Determine the number of turn of a winding by the needs of 220kV standard potential transformer, this number of turn is the number of turn of a common winding of 220kV, 110kV standard potential transformer, the number of turn of the secondary winding of 110kV is two times of the 220kV secondary winding number of turn, by special stable compensation way 110kV standard potential transformer secondary is compensated again, make its error can reach requirement.The compensation way here is generally resistance R, capacitor C or inductance L, capacitor C, specifically determine as required, inductance L can adopt homemade linear inductance, its voltage linear degree can reach in 1%, capacitor C can adopt electrodeless low-loss ac capacitor, and resistance R adopts the noninductive coiling of alloy material to form.

The beneficial effect that the present invention reaches:

Novel all-in-one high voltage standard voltage transformer of the present invention can be measured the voltage transformer of 110kV, two grades of 220kV simultaneously, has reduced the equipment of measuring, and does not need frequent equipment during test.What adopt is the R shaped iron core of high-magnetodensity, low-loss material, and magnetic circuit is good, and stability is high, and the design of line bag is not only considered insulation but also considered the distributing homogeneity of electric field, and the mode leakage field of line bag design is little, integrated These two main no-load voltage ratios, and two accuracy class has all reached 0.01 grade.

Description of drawings

Fig. 1 novel all-in-one high voltage standard voltage transformer overall schematic;

Fig. 2 is high-voltage line bag schematic diagram of the present invention;

Fig. 3 is the essential portion of FIG. 2 vertical view;

Fig. 4 is sleeve structure schematic diagram of the present invention;

Implication mark in the accompanying drawing is as follows:

Fig. 1: ladle bowl 1, sleeve pipe 2, voltage equalizing ball 3, line bag 4, high pressure guide rod 5, iron core 6, iron core folder 7, handle 8;

Fig. 2: R shaped iron core 6, winding 9, secondary winding 10, radome 11;

Fig. 3: line bag 4, iron core 6, iron core folder 7, ladle bowl flange 12, sealing ring 13;

Fig. 4: the profile of sleeve pipe, structural shape.

Embodiment

Below in conjunction with Figure of description, the present invention is further illustrated.

Shown in Fig. 1,2,3,4, voltage transformer of the present invention is to use day steel R shaped iron core 6 coilings of special-purpose Japan, its good linearity, and sudden change can not appear in the ratio of the voltage transformer 20%～120% of design and angular difference good linearity.On this basis, adopt segmentation R, C compensation or L, C compensation technique, make its linearity of 10% to 20% a rated voltage be better than 0.005%, thereby guarantee that the overall accuracy grade can both reach 0.01 grade.

The winding 9 and the secondary winding 10 that are around on the R shaped iron core 6 form line bags 4, winding 9 coiled are successively reduction multistage trapezoidal from inside to outside, this multistage trapezium structure can farthest reduce resistance and the leakage reactance of a winding under the condition that guarantees insulation distance, reduce the error of standard potential transformer.Secondary winding 10 is around in the surface of a described winding 9, forms the trapezoidal top layer of afterbody.The design of line bag 4 is not only considered insulation but also is considered the distributing homogeneity of electric field, and the mode leakage field of line bag design is little, has guaranteed fully

The error characteristics of these two electric pressures can both satisfy 0.01 grade.

The present invention is from the selection of iron core, just consider to miniaturization, lightweight, on structure, make every effort to especially minimum, to adopt concentric circles axle construction and parallel electrode plate structure to make every effort to Electric Field Distribution even more, it is tight that minimizing iron circuit length and line bag thickness are made every effort to electromagnetic coupled, from line bag design, just taken into full account the voltage of compatible 220kV and two grades of 110kV, and the accuracy that has guaranteed two line bags is all at 0.01 grade.

Claims (4)

1. a novel all-in-one high voltage standard voltage transformer is characterized in that, comprises the line bag that winding being around on the R shaped iron core and secondary winding form, and secondary winding is the secondary winding with tap; Determine the number of turn of a winding and the number of turn of secondary winding according to the 220kV standard potential transformer, the number of turn of this winding is the number of turn of a common winding of 220kV, 110kV standard potential transformer; And according to the number of turn of this secondary winding, determine the secondary winding number of turn of 110kV standard potential transformer, the number of turn of 110kV standard potential transformer secondary winding is two times of the 220kV standard potential transformer secondary winding number of turn.

2. novel all-in-one high voltage standard voltage transformer according to claim 1 is characterized in that, it is multistage trapezoidal that a described winding coiled successively reduces from inside to outside.

3. novel all-in-one high voltage standard voltage transformer according to claim 1 is characterized in that, described secondary winding is around in the surface of a described winding, forms the trapezoidal top layer of afterbody.

4. novel all-in-one high voltage standard voltage transformer according to claim 1 is characterized in that, the line bag has two no-load voltage ratios,

The accuracy class of two no-load voltage ratios is 0.01 grade.

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