SU112099A1 - The method of controlling the windings of korea machines direct current on the inter-turn circuit and open circuit - Google Patents

Description

The methods of monitoring the windings of Korea of DC machines on the inter-turn short circuit and open circuit are well known. They have several drawbacks. Thus, for example, the control method by inducing voltage is not suitable for testing koreas with equalizing compounds. The method using a millivoltmeter does not give good results in case of fundamental jets with a low ohmic resistance value, due to the influence of transient resistances of co-tacts. The impulse test method does not provide the control of Koreas with equalizing compounds and requires sophisticated equipment.

The proposed method is more perfect in comparison with the known ones, since it provides an increase in the reliability and consistency of control of the winding of the core of DC machines with equalizing connections and with low ohmic resistance.

This is achieved because the control is carried out not by the magnitude of the ohmic, but by the magnitude of the impedance, as a result of which the sensitivity of the device is increased. The defect section is determined by the reading of the galvanometer included in the diagonal of the AC bridge. The two arms of the bridge constitute the reference resistances, and in the other two, adjacent sections of the inspected core are connected through collector plates.

The drawing shows a schematic diagram of the proposed device.

Adjacent sections 1 and 2 of the core windings are connected through collector plates 5, 4 and 5 into the two arms of the AC bridge. The other two arms of the bridge constitute the reference resistances 6 and 7. The bridge receives power from the transformer 5, and a vibration galvanometer 9 is included in its measuring diagonal.

 - 2 -

When sections 2 if / are in good condition, they are the same complex resistances. And the reading of the galvanometer P is zero or an insignificant magnitude. When .; in the section, equal-complex-resistances of the section / and 2 are broken and the arrow of the galvanometer deviates from-zero knowledge by a significant amount. The same happens with the break of sections / and 2.

Due to the fact that the verification of the winding of the core is performed by comparing the complex resistances of the sections, their inductance reduces the effect of active protection on the result of testing the connections of the winding and transient resistances. At the same time, the influence of contacts is reduced, as a result of which the control results are more reliable.

PREFACE

The method of controlling the windings of Korea DC machines on the inter-loop-short circuit and open circuit, from the laser. in that, in order to increase the reliability of the control of the winding of the core, in particular, the windings with equalizing connections, the inspected sections of the core are switched on through the collector; the two shoulders plates of the bridge of change: -, of whom are the current, and the other two: the shoulders of the bridge are the composition of the south reference: resistance, and in the diagonal - it includes a galvanometer :, tso: reproduction: m: which is determined by the defective section,. .

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