SU972604A1 - Overvoltage protection device - Google Patents

Description

(54) DEVICE FOR BOOT FROM

Reloading

The invention relates to electrical engineering and is intended to protect the insulation of equipment of stations and substations and AC and DC power lines from atmospheric and switching overvoltages.

Valve arresters are known, including spark gaps and serially connected nonlinear resistors assembled in a column and included in a G1 porcelain package.

The disadvantages of these dischargers are the complexity of the design and its low reliability.

The closest technical solution to the invention is an overvoltage protection device containing a nonlinear resistor installed in a hollow insulating case, made in the form of several parallel columns located around a polostyd gas outlet and tightly covered by a heat-conducting electrically insulating dbole in contact with the case. The gas outlet cavity is formed of a specially insulated double-11M insulating cylinder that is coaxially installed inside the case of bit 2.

A disadvantage of this device is the need to use complex fasteners and transitional parts to form the columns of a non-linear resistor and use a special cylinder. In addition, the device does not provide sufficiently effective heat removal from the resistor, which reduces its reliability.

ten

The purpose of the invention is to simplify the design, assembly technology of the device and increase its reliability by more efficient heat removal from the non-linear resistor columns.

15 by making the more developed surface of the housing in contact with the thermally conductive material of the resistor shell and the columns approaching the outer surface of the housing.

20

This goal is achieved by the fact that in an overvoltage surge suction device containing a nonlinear resistor installed in a hollow insulating body, made of several parallel columns arranged around the cavity for gas outlet and tightly covered by a heat-conducting electrically insulating sheath in contact with the body,

Claims (2)

30, the body is made with longitudinal channels in the wall, the columns of the nonlinear resistor are placed in the slurry lx, and the cavity for the gas exit is an image of the inner side surface of the body. In order to increase the explosion-proof safety, the casing is made with longitudinal slits that connect these channels with a cavity for the gas to escape. Figure 1 shows the proposed overvoltage protection device with channels displaced to the gas outlet cavity, a cross section; Figures 2 to 4 show a device with 15 various embodiments of the slots connecting the channels with a cavity for gas outlet, the cross section. . The device consists of an insulating body 1 with channels 2 in which the columns of a nonlinear resistor 3 are located. The space between the columns and the wall of the body is filled with heat-conducting electrically insulating material of the sheath 4. Channels 2 are placed around cavity 5 for the gases to exit. To increase the explosion-proof safety of the device, the channels 2 can be displaced closer to the cavity 5 for the gas to exit (Figure 1) so that the wall between the cavity 5 and the channels 2 is thinner than the wall between the channels and the outer surface of the housing 1. For the same purpose the channels can be connected to the Cavity for the exit of gas by longitudinal slots 6, ensuring the release of gas during the formation of the discharge arc in the channel, without destroying the device casing. Placing the non-linear resistor columns in separate channels simplifies the assembly technology of the device, since it does not require the use of additional fasteners, and the exclusion of a special cylinder that forms a cavity for the gas output simplifies its design. In the proposed device, the heat-conducting material of the shell is in contact with a larger surface of the housing than in the known, and the columns of the non-linear resistor are located closer to the outer cooled surface of the housing while maintaining the mechanical strength of the housing due to bridges between the channels. All this provides a more efficient heat removal from the non-linear resistor columns and, as a result, increases the reliability of the device. Claims 1. An overvoltage protection device comprising a non-linear resistor installed in a hollow insulating case, made in the form of several parallel columns arranged around a cavity for a gas outlet and tightly covered by a heat-conducting electrically insulating sheath in contact with the case that differs that, in order to simplify the construction, assembly technology and increase reliability, the body is made with longitudinal channels in the wall in which the indicated columns of the nonlinear resistor are placed, and a gas outlet cavity is formed by the inner surface of the housing. 2, The apparatus according to any one of claims 1, 1, and 1, in order to improve explosion safety, the housing is made with longitudinal slots connecting said channels with a cavity for the gas to exit. Sources of information taken into account in the examination 1.Shishman D.V. et al. High Pressure Valve Dischargers. L., i Energie, 1971, p. 149-165. 2. USSR author's certificate according to the application f 2572b60 / 21, CL-01-C 1/028, 1978. P "/