SU955279A1 - Protection relay - Google Patents

Description

The invention relates to electrical engineering, more specifically, to relay protection devices for low voltage high voltage lines during overvoltage, and can be used in physiotherapy rooms to turn off the AF-3 apparatus (aeroionization apparatus) when the voltage on the head electrode exceeds the allowable value and occurs danger to the patient.

For relay protection, resistors, frequency relays, and differential relays are used, the main element of which is the induction system C13.

However, in lines with voltages above 10 kV, their use is difficult, since for an induction system, such a voltage requires reliable high-voltage insulation, which significantly increases the size of the relay.

The closest to the proposed technical entity is a protection relay, mainly for low voltage high voltage lines, containing a dielectric case in which the input and output terminals, the sensing element and the contacts 2 are fixed.

; The disadvantage of this device is that when protecting lines with a voltage exceeding 10 kV, enhanced isolation of the sensitive element is necessary /, which significantly complicates the design of the protection relay.

The purpose of the invention is to simplify the design.

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The goal is achieved due to the fact that the protection relay is equipped with a metal axis and a pointed electrode, the sensitive element is made in the form of a metal rocker arm with a thread and an adjusting

15 by a nut, the metal axis is connected by an electrical wire to the input terminal and the metal arm is fixed on it, a pointed electrode is fixed at the ends of this 20 metal arm, and a pointed electrode is fixed to the back of one of the contacts, the thread with the adjusting nut being located between the pointed electrode and the metal electrode axis.

Claims (2)

1 schematically shows a protection relay, front view; figure 2 - time, cut aa in figure 1; fig and 3 - protection relay when triggered. The protection relay has a box-shaped case 1, made of a dielectric material, closed by a cover 2, made of a transparent dielectric, for example, plexiglass. On the side walls of housing 1, fixed contacts 3 and 4 are fixed, as well as input terminal 5. In the center of housing 1, mounted on a metal axis 6, connected by an electric wire 7 to an input terminal 5. On axis 6 there is a beam 8, made of light metal, For example, alugini, consisting of a sleeve 9 and two rods 10 and 11, which are the arms of the rocker arm P. At the ends of the rods 10 and 11, pins 12 and 13 are fixed, Pin 12 is normally closed with a fixed contact 3. On the back side of pin 13 there is a pointed electrode 14, directional pen Ie the rod 11. Between the pointed electrode 14 and the sleeve 9 on the rod 11 there is a thread 15 and an adjusting nut 16. The adjusting nut 16 is necessary to adjust the protection relay to a specific voltage cf, which is set by the corresponding imbalance of the arm 8 arms. The proposed relay works in the following way. Input terminal 5 of the relay is connected to a high voltage source, for example, the negative pole of an apparatus for the fragmentation and aeroionization of AF-3 (not shown), and the fixed contact 3 to the head electrode of this apparatus. Another fixed contact 4 is connected to an automation unit (not shown) designed to turn off the AF-3 apparatus. During the procedure, the patient sits in a chair, touching the metal sheet connected to the positive pole with a high voltage source (an AF-3 apparatus). The metal sheet with the chair is placed on an insulated stand. Above the patient's head at a distance of 12–15 cm there is a head electrode, having hemispherical lobes, equipped with points. The head electrode is connected via contacts 3 and i2 of the relay to the negative pole of the AF-3 apparatus. A voltage of up to 50 kV is applied between the head and foot electrodes. The proposed protection relay operates on the electrodynamic effect of a flowing charge, at which an acute end electrode 14 in air, under the action of electrons and air ions, is under pressure, which can turn the beam 8 around the axis 6. In the process of setting the relay, an adjusting nut 16 produces t imbalance of the rocker arm 8 and ensure that during an outburst on the rocker arm to 50 kV, contacts 3 and 12 are closed, and at higher voltages, so that these contacts are broken under the action of electrodynamic forces unfolding the yoke 8. If, as a result of an overvoltage in the network or as a result of a malfunction of the AF-3 apparatus, the voltage at the output of the high-voltage source increases significantly, then the number of flowing electrons and negative ions 17 which sharply repel electrode 14, and the number of positive ions 18, bombarding electrode 14. As a result, the pressure will increase sharply at the end. rocker arm) 5, where the electrode 14 is located, which causes the rotation of the rocker arm 8 around the axis 6 (FIG. 3). The arm 8 rotates before the contacts 13 and 4 are closed (Fig. 4), and the automation system is triggered. and the high voltage source is turned off. The proposed relay is distinguished by its simplicity and low cost, which allows it to be widely used for relay protection in high-voltage technology. The invention The protection relay, mainly for low-voltage high-voltage lines, contains a dielectric case in which input and output terminals are fixed, a sensitive element and contacts, characterized in that, in order to simplify the design, it is equipped with a metal axis and a pointed electrode, sensitive Zlemeng is made in the form of a metal rocker with a thread and an adjusting nut, the metal axis is connected by an electrical wire to the input terminal and the specified metal box is fixed on it Soap, at the ends of this metal beam, the contacts are fixed, the back side of one of the contacts is a pointed electrode, with the thread with an adjusting nut located between the pointed electrode and the metal axis. Sources of information taken into account in the examination, 1. Automation of production and industrial electronics. - Encyclopedias of modern technology. M., 1964, Vol. 3, pp. 250-251. 2. US patent No. 2111540, cl. 317-.123, 1938. / 2 71 } 7 r f f // 2 FIG.