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

New integrated high voltage standard voltage transformer

technical field

The invention is a special high-voltage standard voltage transformer, which is a part of a power measurement and detection device, and belongs to the technical field of high-voltage power transmission and transformation.

Background technique

Potential transformer is an important part of electric energy measurement, and its accuracy plays an important role in the trade settlement of the sending and power supply department, so it must be tested.

As a standard voltage transformer for testing voltage transformers, it is related to the accuracy of measurement, so it requires high accuracy, good linearity, small no-load and load errors, and high stability.

The voltage level of the standard voltage transformer corresponds to the voltage level of the primary equipment of the power system, which is divided into 6kV, 10kV, 35kV, 110kV, 220kV, 500kV, 750kV, 1000kV, etc. The accuracy of the standard voltage transformer is high, generally 0.05, 0.02 level, 0.01 level, 0.005 level and 0.002 level, etc.; 110kV and 220kV are the common voltage levels now, and the probability of measuring transformers of these two levels at the same time is very high, we generally use the standards of 110kV and 220kV respectively The voltage transformer is tested, so there are many measuring equipments, the process of replacing equipment during the test is complicated, and the workload is heavy. There are also some 220kV standard voltage transformers that can take into account the measurement of 110kV voltage transformers, but the measurement accuracy is not high. , bulky, and not light in weight.

Contents of the invention

The object of the present invention is to provide a new type of integrated high voltage standard voltage transformer which is light in weight and high in accuracy.

In order to achieve the above object, the present invention solves the technical scheme that its technical problem adopts:

In the present invention, the 110kV0.01 standard voltage transformer and the 220kV0.01 standard voltage transformer are designed together, with one winding at a time and a secondary tap design. The number of turns of the primary winding is determined according to the needs of the 220kV standard voltage transformer. The number of turns of the primary winding is the number of turns of the common primary winding of the 220kV and 110kV standard voltage transformers. The number of turns of the 110kV secondary winding is the number of turns of the 220kV secondary winding. Twice of that, and then compensate the 110kV standard voltage transformer twice through a special stable compensation method, so that the error can meet the requirements. The compensation method here is generally resistance R, capacitance C or inductance L, capacitance C, which can be determined according to the needs. The inductance L can be a self-made linear inductance, and its voltage linearity can reach within 1%, and the capacitance C can be a non-polar low loss. The AC capacitance, and the resistor R is made of alloy material without induction.

The beneficial effect that the present invention reaches:

The novel integrated high-voltage standard voltage transformer of the present invention can simultaneously measure voltage transformers of two grades of 110kV and 220kV, which reduces the number of measuring equipment and does not require frequent replacement of equipment during testing. The R-shaped iron core with high magnetic density and low loss material is used, which has a good magnetic circuit and high stability. The design of the wire wrap not only considers insulation but also the distribution uniformity of the electric field, and the design of the wire wrap has small magnetic flux leakage. ,Integrated The two main transformation ratios, and the two accuracy levels have reached 0.01 level.

Description of drawings

Figure 1 The overall schematic diagram of the new integrated high-voltage standard voltage transformer;

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

Fig. 3 is a top view of the main part of Fig. 2;

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

The meaning marks in the accompanying drawings are as follows:

Figure 1: Barrel shell 1, casing 2, pressure equalizing ball 3, wire package 4, high-voltage guide rod 5, iron core 6, iron core clamp 7, handle 8;

Figure 2: R-type iron core 6, primary winding 9, secondary winding 10, shielding cover 11;

Figure 3: wire package 4, iron core 6, iron core clip 7, barrel shell flange 12, sealing ring 13;

Figure 4: Sectional view of the bushing, structure type.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1, 2, 3, and 4, the voltage transformer of the present invention is wound with a special Japanese Nippon Steel R-type iron core 6, and its linearity is good, and the ratio difference of the designed voltage transformer is 20% to 120%. The linearity of the sum angle difference is good, and there will be no sudden change. On this basis, the segmental R, C compensation or L, C compensation technology is adopted to make the linearity of 10% to 20% of the primary rated voltage better than 0.005%, so as to ensure that the overall accuracy level can reach 0.01 .

这两个电压等级的误差特性都能满足0.01级。The primary winding 9 and the secondary winding 10 wound on the R-shaped iron core 6 form a wire package 4, and the primary winding 9 is wound into a multi-level trapezoid that decreases layer by layer from the inside to the outside. This multi-level trapezoidal structure can ensure the insulation distance. Under the conditions, the resistance and leakage reactance of the primary winding can be reduced to the greatest extent, and the error of the standard voltage transformer can be reduced. The secondary winding 10 is wound on the surface of the primary winding 9 to form the last trapezoidal surface layer. The design of the wire package 4 not only considers the insulation but also the distribution uniformity of the electric field, and the magnetic flux leakage is small in the design of the wire package, which fully guarantees

The error characteristics of these two voltage levels can meet the 0.01 level.

The present invention starts from the material selection of the iron core, and considers miniaturization and light weight, and strives for the smallest structure, adopts concentric circular shaft structure and parallel pole plate structure to ensure uniform electric field distribution, and reduces the length of the iron core magnetic circuit and wires. The package thickness strives for tight electromagnetic coupling. From the design of the package, full consideration is given to compatibility with voltages of 220kV and 110kV, and the accuracy of the two packages is guaranteed to be 0.01.

Claims (4)

1. A novel integrated high-voltage standard voltage transformer is characterized in that it comprises a wire wrap formed by a primary winding and a secondary winding wound on the R-type iron core, and the secondary winding is a secondary winding with taps; according to 220kV The standard voltage transformer determines the number of turns of the primary winding and the number of turns of the secondary winding. The number of turns of the primary winding is the number of turns of the common primary winding of the 220kV and 110kV standard voltage transformers; and according to the number of turns of the secondary winding, Determine the number of turns of the secondary winding of the 110kV standard voltage transformer, and the number of turns of the secondary winding of the 110kV standard voltage transformer is twice the number of turns of the secondary winding of the 220kV standard voltage transformer. 2. The novel integrated high-voltage standard voltage transformer according to claim 1, characterized in that, the primary winding is wound into a multi-stage trapezoid that decreases layer by layer from inside to outside. 3. The novel integrated high-voltage standard voltage transformer according to claim 1, characterized in that, the secondary winding is wound on the surface of the primary winding to form the last trapezoidal surface layer. 4. The novel integrated high voltage standard voltage transformer according to claim 1, characterized in that the wire wrap has two transformation ratios,

The accuracy level of the two ratios is 0.01.

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