SU799044A1 - Maximum current disconnector - Google Patents

Description

around its axis, the angle of rotation of which is limited to the specified stop, and the axis on which the rotor is mounted, in the zone of interaction with the dog, is made in the form of a semi-roll, on the cylindrical surface of which rests YUDIN from the ends of the said dog.

FIG. Figure 1 shows the design of the overcurrent release; in fig. 2 is a section A-A Hfi of FIG. 1 in FIG. 3 is a section b-B in FIG. one.

The direction of torque P and current are indicated by arrows.

The release contains an actuator, made in the form of a current coil 1, inside which a fixed cylindrical electrode 2 is mounted coaxially, connected to the internal output of a current coil 1. Inside the ends of the cylindrical electrode 2 by means of insulating flanges 3 and 4 cylindrical current leads 5 and 6 having through coaxial holes. The flange 3 is connected to the cylindrical electrode 2 one-piece, and the flange 4 is removable and has a threaded hole closed with a screw 7. Inside the cavity formed by the cylindrical electrode 2, insulating flanges 3 and 4 and cylindrical current leads 5 and b, a rotor 8 is placed, rigidly connected with axis 9, which can attack. The rotor 8 can be made conductive or of insulating material. The remaining free space between the electrode 2, the flanges 3 and 4, the current leads 5 and b and the rotor 8 is filled with an electrically conductive liquid 10 (Fig. 2), for example, liquid gallium, a eutectoid mixture of gallium-indium-tin, and others. Thus, by means of an electrically conductive liquid The IB is in contact between the cylindrical electrode 2 and the current leads 5 and 6. Axis 9 (FIG. 3) is made in the form of a half-shaft 11 and has a lever 12 and a calibration element 13, which creates a counter moment. In the locking mechanism of axis 9, the dog 14 can rotate about the axis 15 under the action of the spring 16 and is set so that it engages with the cylindrical part of the half-roller 11. The dog 14 is mechanically connected to the return electromagnet 17. The stop 18 limits the angle of rotation of the dog 14, and the limit switch 19 is turned on in such a way that it is affected by the dog 14 when rotated about the axis 15 counterclockwise.

The device works as follows.

With the passage of the rated current, the torque M acting on the rotor 8 is insignificant and is balanced by the opposing torque of the calibration element 13. The electric current passes through the current coil 1, the cylindrical electrode 2, the electrically conductive fluid 10 and cylindrical current leads 5 and b.

At occurrence of current short circuit The pre / first switching capacity of the torque M acting on the rotor 8 increases significantly and rotates the rotor 8 and the axis 9 at a certain angle, sufficient to actuate the free trip mechanism of the switch (not shown),

 with which the release is connected via axis 9.

At the same time, the pawl 14 does not slide off the cylindrical surface of the roller 11. After removing the short circuit, the device automatically returns to its original position.

With the occurrence of a current short circuit one-time switching capacity 0 device action is similar to the action at the current limit switching capacity, only the torque M is much higher. The roller 11 is rotated by the angle at which the dog 14 comes off the cylindrical surface of the floor of the alik 11 and falls into the slot, the income until it stops 18 under the influence of the spring 16.c in this position the dog 14 locks the release tool in the off position after

0 switch action. In this case, the switch can not be turned on again without unlocking. When unblocking manually or remotely from, 1 bag 14 and half roller 11 are returned.

5 to its original position.

The proposed device is most appropriate to use when creating powerful power switches for high currents short-circuit. as well as in electrical installations with large currents, as a separate maximum current sensor installed in the rassechka busbar, during operation of these objects, their reliability is increased.

Claims (2)

Invention Formula 50 1. Maximum overcurrent release containing a power actuator, a calibrating element and an actuating element acting on the free trip mechanism, about l and  for the purpose of  extending the range of operation, reducing the size and increasing the reliability of operation, the power drive is released as a current coil, cylindrical electrode, cylindrical 60 current leads and a rotor, a cylindrical electrode is installed inside the current coil and connected to one of its terminals, cylindrical current leads are made with through 45, the poles, in which the axis for rigidly fixing the rotor, and are installed with the help of insulating flanges coaxially and symmetrically with each other from the ends of the cylindrical electrode, and the cylindrical electrode, insulating flanges and cylindrical current leads are installed so as to form a cavity that is filled with an electrically conductive liquid. 2. The release according to claim 1, characterized in that, in order to select short-circuit currents in magnitude and block the switch from re-activation at currents of a one-time switching capacity, it is provided with a locking mechanism made in the form of a spring-loaded dog and stop, the dog is installed rotatably around its axis, the angle of rotation of which is limited to the indicated stop, and the axis on which the rotor is mounted, in the zone of interaction with the dog, is made in the form of a semi-roll, on the cylindrical surface of which rests one of the condas of the said dog. Sources of information included in the examination 1.Taev Y.S. Electric control devices. M., Higher School, 1969, m. 286. 2. Volkov A.V. Technologists 5 of the production of electrical apparatus control and protection. L., Energie, 1977, p. 268-270. 7 " 73 Fi.Z