SU1613977A1 - Method of checking deformation of windings of power transformers - Google Patents

Abstract

The invention relates to instrumentation technology and can be used to continuously monitor the state of the windings of power transformers. The purpose of the invention is to simplify the implementation. With the help of current transformers 6, the current complexes of the split windings 4 of all phases of the control object 1 are measured. Information about the modules of these currents goes to the inputs of control unit 7, where it is processed. When a current is detected, the phase of which coincides with the phase of the sum of currents of all windings, the magnetic circuit 2 is fixed on which there is a deformed winding 9. The current of this winding is fixed, the ratio of the amplitude of the fixed current to the amplitude of the sum of currents is determined and the resulting ratio is determined by the degree of deformation winding 9. 1 Il.

Description

one

(21) 4217204 / 24-21

(22) 03/27/87

(46) December 15, 90 Bup. No. 46

(71) Novocherkassk Polytechnic Institute. Sergo Ordzhonikidze

(72) A “C. Zasshkin, V.A. Garmash and V.V. Ilyinichin

(53) 621.317 (088.8)

(56) USSR Author's Certificate No. 1221620, cl. G 01 R 31/02, 1986.

USSR author's certificate - b. 1377778, class C 01 R 31/02, 1.87 „.

(54) METHOD FOR MONITORING DEFORM 11M1 WINDOWS OF POWER TRANSFORMERS

(57) The invention relates to an instrumentation technique and can be used to continuously monitor the state of the windings of power

transformers. The purpose of the invention is to simplify the implementation. Using current transformers 6, the current complexes of the split windings 4 of all phases of the control object 1 are measured. Information about the modules of these currents is fed to the inputs of the control block 7, where it is processed. When a current is detected, the phase of which coincides with the phase of the sum of the currents of all the windings, the magnetic circuit 2 is fixed on which there is a deformed winding 9. The current of this winding is fixed, the ratio of the amplitude of the fixed current to the amplitude of the sum of the currents is determined and the resulting ratio is determined by the degree of deformation winding 9. 1 Il.

with

The invention relates to instrumentation technology and can be used to continuously monitor the state of the windings of power transformers.

The purpose of the invention is to simplify the implementation of the method;

The drawing shows a scheme implementing this method.

The diagram shows control objects 1, magnetic cores 2, phase outputs 3, high voltage windings 4 consisting of two sections, conclusions 5 sections, current transformers 6, control block 7, operating voltage source 8, low voltage windings 9, source pins 8 are connected to phase pins 3, transformers 6 are installed on the corresponding pins 1, their pins 5, and inputs of control unit 7 are connected to the outputs of the corresponding transformers 6.

The method is implemented in the following manner.

From transformers 6, the currents of the winding sections 4 of all phases of the control objects 1 and the sum of the differences of currents of the sections of the objects arrive at the inputs of block 7. In block 7, the phases of the currents of the sections are compared with the phase of the sum of the differences of the currents of the sections. When detecting a section current, the phase of which coincides or is opposite to the phase of the specified sum of currents, the magnetic circuit 2 is fixed, on which there is a deformed winding 9. The oTHOinemie is determined.

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the value of the sum of the differences in the currents of the sections of the objects to the current of the winding section and on the fixed magnetic circuit 2 and the resulting ratio is judged by the degree of deformation of the winding 9.

Claims (1)

Invention Formula The method of controlling the deformation of the windings of power transformers, which consists in measuring the currents in the windings, determines in an uninterrupted mode the deviation of the short-circuit resistance of the controlled transformer from the initial value, according to which the degree of deformation of the windings of the object l, characterized in that, in order to simplify the implementation, the differences in the currents of the sections of the unsplit, windings in each phase are summed, the determined differences in three phases are compared, the phases of the obtained sum are compared alternately with the phases of the currents of the sections of all discontinuous windings, in the absence of phase shift in (aim the magnetic core with the deformed winding, fix the current value in the winding of this magnetic core and determine the deviation of the short-circuit resistance from the initial value as the ratio of the modulus of the sum of the differences of current currents Ktsy to the module of a current of the damaged winding.