SU1026173A1 - Method of manufacturing high-voltage bulk resistor - Google Patents

Abstract

1. THE METHOD OF MAKING A HIGH-VOLTAGE VOLUME RESISTOR, including the preparation of a dry homogeneous resistive mixture by mixing particles of the current-conducting component. on the basis of graphite and dielectric filler, attachment to the dielectric case of the electrode / insertion of a resist (a mixture into the dielectric case followed by a second; dyneniem second electrode to the resistive mixture, so that expanding the field of application and increasing the reliability of the resistor, inserting the resistive mixture into the dielectric case is carried out in layers, followed by layer-wound compaction with a pressure of 10; 200 kPa, and the connection of the second electrode is carried out at seals the resistive mixture, and to prepare a resistive mixture, particles of the conductive component and the dielectric filler are used with a specific surface area of 6000 - 150000 and Ij9 - 30,000, respectively. 2, The method according to claim 1, tl and h (L and in order to increase the uniformity of the distribution of the re: 3 mixture over the length of the resistor, the introduction of the resistive mixture into the dielectric case is carried out in layers Q; 40-60 mm high.

Description

The invention relates to electrical industry and can be used in the manufacture of high-power volumetric high-voltage resistors designed for short-term work in the switching equipment of power plants and power lines, for example, in discharge circuits of shunt capacitor banks. Of the known powerful high-voltage resistors, the largest use in electrical power engineering has been found in bulk composite resistors made of electrically conductive concrete (betel). A known method of manufacturing powerful high-voltage bulk resistors, including the preparation of a resistive mixture consisting of a dielectric filler containing cement and a conductive additive, wetting the mixture / manufacturing of resistive elements in molds, heat treatment of elements in molds, metallization of contact surfaces of resistive elements, assembly; resistive elements in a pole, installation of spring-loaded electrodes 1. Resistors of a similar design are widely used in electric power ike, such as resistors shun tiruyuschih air switches 110-330 kV, i.e. with the value of the resistivity of the active part up to 10 ohm cm. However, the disadvantage of these resistors is the low specific energy of accumulation (up to. 60 J / cm and low service life (10-30 impulse inclusions) with the sign of the resistivity of the materials of the active part greater than 10 Ohmsm. Low joule-second characteristics of high-resistance electrically conductive concrete removed a low content of conductive additives in the pressed betel, the amount of which is not enough to form stable conductive connections in a fixed (solidified) structure. weak loads are destroyed in fixed structures that are restored, which leads to the aging of betel. The closest in essence to the technical essence is the method of manufacturing high-voltage volume resis- ture, the preparation of a dry redistributive mixture of over-current and current conductive particles on the basis of graphite and dielectric filler, joining to the dielectric body of the electrode, the introduction of a resistive mixture into the dielectric body, followed by the second electrode to the resistive mixture 2.: However, this method has the following disadvantages: fabricated resistors of the stationary type; the resistance value varies during the operation due to the deposit of the material of the active part; The sizes of the particles of the components on which the parameters of the bulk resistor depend are not indicated: the limiting energy of accumulation and the magnitude of the voltage gradient. The purpose of the invention is the expansion of ob-. areas of application and increase the reliability of the resistor. The goal is achieved by the fact that in the method of manufacturing a high-voltage bulk resistor, including (preparation: dry homogeneous resistive mixture by mixing particles of a current-conducting component based on graphite and a dielectric filler, inserting the resistive mixture into a dielectric case and then attaching the second the electrode to the resistive mixture, the introduction of the resistive mixture in the dielectric case is carried out in layers, followed by layers sealing it with a pressure of 10–200 kPa, and attaching the second electrode is carried out under pressure of layer-by-layer compaction of a resistive mixture; moreover, particles of a conductive component and a dielectric filler with specific magnitude of Yosti 6000 - 150000 and 1.9 - 30000 CM / are used to prepare the resistive mixture. t, respectively, in order to increase the uniformity of the distribution of the resistive mixture along the length of the resistor -. The introduction of the resistive mixture into the dielectric case is carried out in layers with a height of 40-60 mm. op, general view. , The resistor is manufactured as follows. A resistive mixture 3 is layered into layers in a dielectric case 1 with a lower electrode 2 installed. A movable aluminum electrode 4 with a canal 5 for an o-ring (not shown) is installed on the top layer of the active part of the resistor thus prepared. A spring-contact device 6 is placed above the movable electrode 4, which is compressed when installing the cover 7, ensuring that the active part is constantly pressed with a force of not 1 kgf / cm. In order to determine the degree of compaction of the resistive mixture and the effect of pressing pressure on the change in resistivity and precipitation of the mixture in the process of compaction experiments have been carried out to evaluate these phenomena .. h

In tab. Figures 1 and 2 present the values of resistivity values and from

change of linear dimensions of samples of high-voltage volume resistors, made on the basis of dry mixtures with different initial resistivity.

Table 1.

Analysis of the data in the tables shows / that an increase in pressure} of the density of the mixture above .2.0 kg / cm does not lead to changes in the specific values, resistances and draft of the resistive material. For high impedance resistors, a minimum mix filling is required. . Based on the experimental data, in order to ensure equal daeing control of the resistive mixture along the i-th level, it is necessary to ocerate the layer-by-layer cooling of the dry mixture into the dielectric case of the resistor c. compaction of the caextrous layer with a pressure of limiting 0.1–2.0 kg / cm. The biacoxa layer is within a range of 40 -: 60 mm.

Table 2 t To determine the specific energy of the accumulator and the service life of a 1c unit of a resistor, voltage and current tests were carried out in the SMiTopa gene circuits of impulse currents and a shock generator of industrial frequency. For this purpose, the resistors of the proposed construction with a specific resistance of 12500 Ohmsm to .150000 Omusm, the diameter of the active part is 100 mm, height 800 mm, are manufactured. At the same time, resistors were manufactured, the active part of which was assembled according to technology 1.: In Table 3, the admissible values of the specific energy accumulated for high (m resistors with a specific resistance of 12500. and 150000 Characteristics The permissible value of the specific energy of accumulation at 1 V / cm (voltage of industrial frequency) J / cm, ", p, in" - Table 4 shows the resistivity of volt-spacers for dynamic effects Resistance Initial, kOm After the 1st pulse, com After the 10th pulse, com After 20 pulse, kΩ after the 30th pulse, kΩ

Resistors made according to the proposed method allow significantly

reduce operating costs by kjai and the number of failed resistors.

I Resistivity, Ohm "cm proposed resistor resistor manufactured 12500 .150000 12500 t50000 155 9090 50 T. -.-, Data from the IZMEnstva with an amplitude of 80 kV and a length of high impulse of 0.8 s. The magnitude of the tori With chic, the specific anergy of accumulation in a pulsed pulse of 10 Dk / cm,. . , -. ,,,;. , Tbl and tsa .: 4 ;. The Specific Resistance of the Proposed Resistor Resistor, manufactured by 12500 150000 12500 150000 12 715312.8 153 11.8 13011.6 139 11.6 12813.7 223 11.712315.1 600 11.7 123-. Table T .... i on technology 1 "v. on technology 1.

Claims (2)

1. METHOD FOR PRODUCING A HIGH VOLTAGE VOLUME RESISTOR, including preparing a dry homogeneous resistive mixture by mixing particles of a conductive component based on graphite and a dielectric filler, attaching an electrode to a dielectric body, introducing a resistive mixture into a dielectric body, followed by attaching a second electrode to the resistive mixture, from And I want to say that in order to expand the scope and increase the reliability of the resistor, the introduction of the resistive mixture into the dielectric The case is carried out in layers, followed by layer-by-layer sealing with its pressure of 10 [200 KPa, and the second / electrode is connected at the pressure of layer-by-layer sealing of the resistive mixture, and particles of a conductive component and dielectric filler with a specific surface area of 6000 - 150,000 _d and 1 are used to prepare the resistive mixture , 9 - 30000 cm ^ / g, respectively. & 2. The method according to π. 1, it is important that, in order to increase the uniformity of the distribution of the resistive mixture along the length of the resistor, the introduction of the resistive mixture into the dielectric casing is carried out in layers 2. 40-60 mm high. > 1026173