CN205609343U - Hierarchical formula current -voltage combined mutual inductor - Google Patents

Abstract

The utility model relates to a graded current-voltage combination transformer, which comprises an inner insulating medium layer and an outer insulating medium layer arranged on a coaxial line, the inner surface of the inner insulating medium layer is pasted with a first metal layer, and the outer surface of the inner insulating medium layer is A second metal layer is attached, a third metal layer located outside the second metal layer is attached to the inner surface of the outer insulating dielectric layer, a fourth metal layer is attached to the outer surface of the outer insulating dielectric layer, and the second metal layer includes At least one inner low-voltage electrode, the third metal layer includes outer low-voltage electrodes corresponding to the number of inner low-voltage electrodes one by one, and the inner low-voltage electrodes are short-circuited with the corresponding outer low-voltage electrodes. The utility model solves the problem in the prior art that the continuously arranged structure of the metal layer, the insulating medium layer, the metal layer, the insulating medium layer and the metal layer has higher requirements on the processing technology.

Description

A Classified Current-Voltage Combination Transformer

technical field

The utility model relates to a graded current-voltage combined transformer.

Background technique

With the development of the power system in the direction of large capacity, ultra-high voltage and ultra-high voltage, the requirements for miniaturization, intelligence and high reliability of power equipment are getting higher and higher. The principle of protection, in order to meet the requirements of the current smart grid, there is an urgent need for a miniaturized, high-reliability, and high-precision multi-output current-voltage combined transformer. Existing voltage transformers such as the "multi-output electronic voltage transformer for GIS" disclosed in Chinese patent CN203772925U, the voltage transformer includes a pressure vessel, and the pressure vessel is provided with a primary conductor, a suspension cylinder, a first The metal layer, the second metal layer and the third metal layer, the first metal layer is attached on the suspension electrode, the second metal layer includes two low-voltage electrodes with a tile structure, and each low-voltage electrode is arranged at intervals along the circumference of the primary conductor, Inner and outer insulating dielectric layers are respectively arranged between the first metal layer and the second metal layer and between the second metal layer and the third metal layer. The voltage transformer adopts a capacitive voltage divider structure, uses a primary conductor and a suspended cylinder as a high-voltage capacitor, and uses a coaxial metal layer structure separated by insulation as a low-voltage capacitor. After the conversion of double A/C, it is converted into an optical signal by the photoelectric conversion device, and then it is synchronously processed by the optical fiber access merging unit and then measured on the protection equipment. The existing problem of this graded voltage transformer is that it is easier to implement the process of arranging metal layers on the inner and outer surfaces of an insulating medium layer, but the metal layer, insulating medium layer, metal layer, insulating medium layer, metal layer, etc. The continuous close-fitting setting process is difficult to realize, and the processing technology requires high processing technology, which is not easy to realize, and the cost is relatively high.

Contents of the invention

The purpose of the utility model is to provide a graded current-voltage combination transformer to solve the problem of the prior art in which the continuous arrangement of the metal layer, insulating medium layer, metal layer, insulating medium layer, and metal layer requires a higher processing technology. The problem.

In order to solve the above problems, the technical solution of the utility model is:

A graded current-voltage combination transformer, including a pressure vessel and an inner insulating layer and an outer insulating layer arranged on a coaxial line, the inner surface of the inner insulating layer is pasted with a first metal layer, and the outer surface of the inner insulating layer is pasted A second metal layer is provided, the inner surface of the outer insulating medium layer is attached with a third metal layer spaced outside the second metal layer, the outer surface of the outer insulating medium layer is attached with a fourth metal layer, and the second metal layer includes At least one inner low-voltage electrode, the third metal layer includes outer low-voltage electrodes corresponding to the number of inner low-voltage electrodes one by one, the inner low-voltage electrodes are short-circuited with the corresponding outer low-voltage electrodes, a metal shielding cylinder is arranged in the pressure vessel, and a metal shielding cylinder is arranged in the metal shielding cylinder. There are Rogowski coils.

The gap between the second metal layer and the third metal layer is filled with insulating glue.

The inner coaxial line of the first metal layer is attached with a floating potential tube, and the inner coaxial line of the floating potential tube is provided with a primary conductor.

The first, second, third and fourth metal layers are copper foil layers.

There are at least two inner low-voltage electrodes, the inner low-voltage electrode is a tile structure arranged coaxially with the inner insulating medium layer, the outer low-voltage electrode is a tile structure arranged coaxially with the outer insulating medium layer, each inner low-voltage electrode is arranged along the inner The insulating medium layer is arranged at intervals in the circumferential direction, and the gap between the adjacent inner low-voltage electrodes corresponds to the gap between the corresponding adjacent outer low-voltage electrodes along the radial direction of the inner insulating medium layer.

The beneficial effects of the utility model are: in the utility model, the first metal layer and the second metal layer are respectively attached to the inner and outer surfaces of the inner insulating medium layer, and the third metal layer and the fourth metal layer are respectively attached to the outer surface. On the inner and outer surfaces of the insulating dielectric layer, the second metal layer and the third metal layer are arranged at intervals, so that the first metal layer, the inner insulating dielectric layer and the second metal layer form a unit, and the third metal layer, the outer insulating dielectric layer and the fourth metal layer also form a unit, and each unit is easy to process, which simplifies the product processing technology and reduces the production cost of the product.

Description of drawings

Fig. 1 is the structural representation of an embodiment of the utility model;

Fig. 2 is a cross-sectional schematic diagram of cooperation between each insulating dielectric layer and the corresponding metal layer in Fig. 1;

Fig. 3 is a longitudinal sectional schematic diagram of cooperation between each insulating dielectric layer and the corresponding metal layer in Fig. 1;

Fig. 4 is the electrical schematic diagram of the utility model.

detailed description

The implementation of the graded current-voltage combination transformer is shown in Figures 1 to 4: it includes a pressure vessel 10, a primary conductor 1 is arranged inside the pressure vessel 10, a floating potential cylinder 2 and an inner insulating medium layer are arranged on the outer coaxial line of the primary conductor 4 and the outer insulating medium layer 8, the suspension potential cylinder provides mechanical support for each metal layer, the inner surface of the inner insulation medium layer 4 is attached with the first metal layer 3, and the inner surface of the first metal layer 3 is attached to the suspension potential cylinder 2, a second metal layer 5 is attached to the outer surface of the inner insulating dielectric layer 4. The inner surface of the outer insulating medium layer 8 is attached with the third metal layer 7 outside the second metal layer, and the outer surface of the outer insulating medium layer is attached with the fourth metal layer 9 , and the fourth metal layer 9 is grounded. The second metal layer includes two inner low-voltage electrodes. The inner low-voltage electrode is a tile structure arranged coaxially with the inner insulating medium layer. The third metal layer includes outer low-voltage electrodes corresponding to the number of inner low-voltage electrodes one by one. The electrodes are tile structures arranged coaxially with the outer insulating medium layer. Each inner low-voltage electrode is short-circuited with the corresponding outer low-voltage electrode through a conductor 11, and the gap 12 between adjacent inner low-voltage electrodes is along the diameter of the inner insulating medium layer. The direction corresponds to the gap 13 between adjacent outer low-voltage electrodes. The insulating glue 6 is filled between the second metal layer and the third metal layer. The insulating glue can not only insulate the adjacent inner low-voltage electrodes and the adjacent outer low-voltage electrodes, but also ensure the overall strength of the product. . In this embodiment, each metal layer is a copper foil layer. A metal shielding cylinder 11 is also arranged in the pressure vessel, and a Rogowski coil 12 is arranged in the metal shielding cylinder.

An insulating gas (such as sulfur hexafluoride) is used to insulate the primary conductor and the floating potential cylinder, and a high-voltage capacitor is formed between the two, which bears the main part of the potential voltage drop from the primary conductor to the pressure vessel. Two-stage capacitors are respectively formed between the first metal layer and the second metal layer and between the third metal layer and the fourth metal layer, and the two-stage capacitors are bonded together by insulating glue. The two-stage capacitors are independent in structure, and the processing technology is the same. The inner and outer insulating dielectric layers are of high toughness and high insulating performance. When in use, a matching resistor is connected in parallel between the outer low-voltage electrode and the fourth metal layer, and the voltage acquisition unit is connected through a shielded cable. The output of the Rogowski coil is connected to the current acquisition unit through a shielded cable. The current acquisition unit and the voltage acquisition unit are installed on the outside of the pressure vessel. Inside the metal shell, it can avoid the interference of external electromagnetic field.

As shown in Figure 4: the capacitance parameter C ₁ of the outer surface of the primary conductor and the surface of the floating potential cylinder near the side of the primary conductor, the capacitance parameter C 2a between the inner low-voltage electrodes of the first metal layer 3 and the second metal layer 5, and the capacitance parameter C _2a of the fourth metal layer 9 The capacitance parameter C _2b between the third metal layer and each outer low-voltage electrode 7 can be obtained according to the coaxial capacitance calculation formula, and will not be repeated here. The matching resistance R _p calculation formula is as follows:

$\frac{{\stackrel{<span\; class="notranslate">\; ~</span>}{\stackrel{<span\; class="notranslate">\; \&Center\; Dot;</span>}{\mathrm{<span\; class="notranslate">\; u</span>}}}}_{\mathrm{<span\; class="notranslate">\; i</span>}}}{{\stackrel{<span\; class="notranslate">\; ~</span>}{\stackrel{<span\; class="notranslate">\; \&Center\; Dot;</span>}{\mathrm{<span\; class="notranslate">\; u</span>}}}}_{\mathrm{<span\; class="notranslate">\; o</span>}}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&alpha;C</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; b</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; j</span>}\frac{\mathrm{<span\; class="notranslate">\; \&alpha;</span>}}{{\mathrm{<span\; class="notranslate">\; wxya</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

In the formula: n is the number of inner low-voltage electrodes.

According to formula (1), the known output value is The matching resistance R _p can be obtained.

In other embodiments of the present invention: the number of inner low-voltage electrodes can also be one, three or other numbers; the second metal layer and the third metal layer can also be insulated by filling insulating gas; the inner low-voltage electrodes . The outer low-voltage electrodes may also be cylindrical structures arranged coaxially with the corresponding insulating medium layer, and at this time, the low-voltage electrodes are arranged at intervals along the axial direction.

Claims (5)

1. stagewise current/voltage combination transformer, the interior insulating medium layer including pressure vessel and being coaxially set and external insulation dielectric layer, it is characterized in that: the inner surface of interior insulating medium layer has been sticked the first metal layer, the outer surface of interior insulating medium layer has been sticked the second metal level, the inner surface of external insulation dielectric layer is sticked the 3rd metal level being located at interval at outside the second metal level, the outer surface of external insulation dielectric layer has been sticked the 4th metal level, second metal level includes low-field electrode inside at least one, 3rd metal level includes and inner side low-field electrode number outside low pressure electrode one to one, inner side low-field electrode and corresponding outside low pressure electrode short circuit, metallic shield cylinder it is provided with in pressure vessel, it is provided with Luo-coil in metallic shield cylinder.

Stagewise current/voltage combination transformer the most according to claim 1, it is characterised in that: the gap between the second metal level and the 3rd metal level is filled with insulating cement.

Stagewise current/voltage combination transformer the most according to claim 1, it is characterised in that: the inner coaxial line of the first metal layer has been sticked floating potential cylinder, and the inner coaxial line of floating potential cylinder is provided with Primary Conductor.

Stagewise current/voltage combination transformer the most according to claim 1, it is characterised in that: first, second, third and fourth metal level is copper foil layer.

5. according to the stagewise current/voltage combination transformer described in claim 1 ~ 4 any one, it is characterized in that: inner side low-field electrode has at least two, inner side low-field electrode is the tile structure being coaxially set with interior insulating medium layer, outside low pressure electrode is the tile structure being coaxially set with external insulation dielectric layer, each inner side low-field electrode being provided at circumferentially spaced along interior insulating medium layer, the gap between adjacent inboard low-field electrode is the most corresponding along the gap between the radial direction and corresponding adjacent outer low-field electrode of interior insulating medium layer.