SU1148004A1 - Device for testing electric strength of multi-layer winding insulation - Google Patents

Abstract

A DEVICE FOR INSPECTION OF ELECTRICAL STRENGTH OF INSULATION OF MULTILAYER WINDOWS, containing a switchboard and a test unit, the first output of which is connected to a common bus, and the second one is connected to one of the two objects to be connected to the control object, which is different in that it is entered a source of compressed gas, connected by a pipe with a switch, and the switch is designed as an expansion vessel consisting of insulating and conductive layers, the last of which is connected to a common bus. (About c:

Description

The invention relates to electrical measuring equipment and can be used to test multilayer windings with ferromagnetic plates between layers, for example, for baseless electric machines. A device for testing the electrical strength of isolating multiple layer windings is known, which contains a test transformer with protection blocks in the primary winding and current-limiting resistors in the secondary windings, controlled windings without ferromagnetic plates between the layers, a switching switch, electrical equipment case contact l . A disadvantage of this device is the low productivity and limited functionality due to the impossibility of carrying out a test of the electrical strength of multilayer windings with ferromagnetic plates between the layers. The closest in technical essence is a device for testing the electrical strength of insulation of multilayer windings, containing a test transformer with protection blocks in the primary winding circuit, one output of the transformer secondary winding is connected to the ground contact, and the other output through a current-limiting device with a controlled winding switch, the contact knife of which contains a carrier and two sliders, made in the form of contact rollers mounted on springs in the carrier's slots with the possibility of closing erromagnitnyh control winding plates and their movement along the surfaces of z. The disadvantage of the device is low productivity due to the impossibility of accelerating the testing of the insulation of the multilayer winding with the simultaneous formation of contacts across all ferromagnetic plates. The purpose of the invention is to accelerate the process of control testing of multilayer windings. The goal is achieved by the fact that a device for testing the electrical strength of the insulation of multilayer windings, containing a switch and a test unit, the first output of which is connected to a common bus, and the second to one of the two terminals for connecting the test object, a source of compressed gas, connected by a pipe with a switch, and the switch is made in the form of an expansion vessel consisting of insulating and conductive layers, the last of which is connected to a common bus. FIG. 1 shows a schematic diagram of a device for checking the electrical strength of the insulation of multilayer windings; in fig. 2 is a switch used in testing a multi-layered stator winding of an electric machine; in fig. 3 switch used in testing the multilayer winding of the rotor of an electric machine. A device for testing the electrical strength of the insulation of multilayer windings contains a test unit t, for example, if the insulation resistance is monitored, the megohmmeter is monitored, and when testing the electrical strength, a high-voltage installation, switch 2 and a source of compressed gas 3 connected to it . The test unit 1 is connected to a controlled multilayer winding 4, between which turns are ferromagnetic plates 5 connected via a switch to a common bus 6. Switch 2 is made in the form of an expansion vessel connected by nozzle 7 with a source of 3 compressed gas. The switch 2 vessel is made, for example, of two layers (Figs. 2 and 3) from the base — the insulating layer 8, for example, from rubber and the conductive layer 9 (the vessel can be single-layer, only from the conducting layer 9). The multilayer winding 4 and the PMO 10 of the magnetic core are separated both in the stator (Fig. 2) and in the rotor (Fig. 3) of the insulating gap 11 from the adhesive composition, which mechanically fastens the PMO 10 with the multilayer winding 4. Device for testing the electrical strength of the insulation This multilayer winding works as follows.

31

in the case of testing the electrical strength of the insulation of the myogolayed stator winding of the electric machine (Fig. 2), switch 2 is inserted into its bore, which is grounded in advance to the common bus 6. The vessel of switch 2, the pear-shaped one, communicates with source 3 of compressed gas, which The nozzle 7 fills the cavity 12, with the layers 8 and 9 taking the shape optimal for testing, the shape of the stator bore. At this time, the conductive layer 9 comes into contact with all the ferromagnetic plates 5 of the multilayer winding 4. The action of the compressed gas inside the cavity 12 of the switch 2 is not removed, the multilayer winding 4 is connected to the test unit 1, for example, a megohm meter first after its switching to the high-voltage installation, the electrical strength of the winding insulation is tested. After disconnecting from the ce: test unit 1, cavity 12 is disconnected from source 3 of compressed gas. From boring multilayer ob480044

. the coils 4 of the stator remove switch 2..

In the case of testing the electrical strength of the insulation of a multilayer 5 rotor windings of an electric machine (Fig. 3), a vessel of switch 2, for example, of an annular form, which is connected to a source of compressed gas, is put on its surface, and a cavity 12 is filled at nozzle 7. 9 of the switch 2 takes the form optimal for testing, - the form of full circumference of the rotor winding.

15 Further, the device works in the same way as described.

The application of the invention expands the technological capabilities of such devices, at the same time

0 quality characteristics and also allows to increase labor productivity (a test operation using the proposed device takes 5 seconds, which

5 six times increases productivity, operations and measures of resistance in 9 seconds, which increases labor productivity by about 400 times).

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Claims (1)

DEVICE FOR CHECKING THE ELECTRICAL STRENGTH OF INSULATION OF MULTILAYER WINDINGS, containing a switch and a test unit, the first 'output of which is connected to a common bus, and the second - with one of two terminals for connecting the test object, characterized in that, in order to accelerate the process of control tests , a source of compressed gas is introduced into it, connected by a pipe to the switch, and the switch is made in the form of an expansion vessel, consisting of insulating and conductive layers, the last of which is connected to a common bus.