SU1506397A1 - Method of monitoring the condition of electric insulation - Google Patents

Abstract

The invention relates to the field of instrumentation technology and can be used to diagnose the state of insulation of electrical equipment and electrical networks. The purpose of the invention is to expand the functionality. The signal from the control unit 8 from the stabilized voltage source 1 through the current sensor 2 is applied to the control object 12 to a stabilized voltage. The current magnitude signal is removed from sensor 2, fed through analog-to-digital converter 3 to memory block 4, where it is stored four times with a time delay. The delay is set using delay blocks 5-7 on command from control block 8. The values of the measured currents are compared with each other in unit 10 of the comparison. According to the results of the comparison, the display unit 11 carries out the inclusion of the corresponding indicators characterizing the insulation conditions of the object 12 of the control. 1 il.

Description

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The invention relates to instrumentation engineering and can be used to diagnose the state of insulation of electrical equipment and electrical networks.

The aim of the invention is to expand the functionality.

The drawing shows the block diagram of the device that implements the method.

In the diagram, source voltage stabilizer 1, current sensor 2, analog-digital converter 3, memory block A, first 5, second 6 and third 7 delay blocks, time control unit 8 of time counter 9, comparison unit 10, unit 11 display, control object 12, terminal 13; connection to the control object and grounding 14, to which the first output of source 1 is connected, the second output of which is connected to the input of sensor 2, the first output of which is connected to terminal 13, and the second to the input of converter 3 whose output is connected to the first input block and 4 memory, the second, third and fourth inputs of which are connected to the outputs of the first 5, second 6 and 1 third 7 delay blocks, respectively, whose inputs are connected to the first output of the control unit 8, the second output of which is connected to the control input - (point 1, the third with the fifth input | of the memory block 4, and the fourth and fifth:; with the first inputs, respectively;: the counter 9 and the comparison block 10,; the second inputs of which are connected respectively with the first and second outputs of the block 4 memory, and the outputs - respectively with the first and second inputs of the block 11 indications.

The method is carried out as follows.

The signal from unit 8 from source 1 through the sensor 2 to the control object 12 is supplied with a stabilized voltage. The current magnitude is sensed by sensor 2 and through conversion 10

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The inclusion of relevant indicators: the presence and type of defect of the object 12 of the control.

If the value of the measured current rises from the first measurement moment to the fourth, then the presence of unacceptable insulation moisture is indicated.

If the currents measured at the first and second time points are equal to each other, but less than the currents measured at the third and fourth time points, equal to each other, mechanical insulation damage is indicated.

If the current measured at the first point in time is less than the equal currents measured at the second, third and fourth points in time, the presence of an invalid erasure of the insulation is indicated.

If the value of the measured current rises from the first measurement time to the third, after which the rise of the measured current stops until the fourth measurement time, a good insulation condition is indicated.

Claims (1)

Invention Formula The method of controlling the state of electrical insulation, in the closed state: that a stabilized voltage is applied to the test object, the current flowing through the test object, characterized in that, for the purpose of extending the functionality, of the HSNiepenne current flowing through the control, is measured produced four times: at the moment of applying to the object of control a stabilized voltage and at intervals of time determined by the maturity of the processes of charging the capacity of the object of control, the polarization of the insulation of the object of control and electroosmosis in control object, compare: Tel 3 in the form of a digital code gives- Measured values and results From the memory block 4, where it is stored four times with a delay on the commands of the control block 8, the passage w 1m through the blocks 5-7 to the memory block 4. The values of measured currents, discontinued: resistance-based, are recorded by a counter 9i are compared to each other in the block. 10 compared. According to the results of the comparison, in block 11 of the demonstration, the comparison establishes the presence and cause of the deterioration of the insulation condition according to the following ratios: when I (t,) I (t) I (L,) iCtJ there is a mechanical isolation; when I (t,) irt.) (tp I (t), there is an error of 1us gilch; with aging 51506397 Isol 1d1i; at I (t,) I (t)) of the control object; I (t) is a current over I (t) there is an unacceptable uv-through control object through the interval lazneiii isolation, where I (t) - current, equal to the duration of the process through the object of control at the time of the polarization of the insulation of the object of control to the object of control stabilized; I (t) is the current through the object of the pin voltage; iCtj) - the current through the trolley after a time interval equal to object of control through the interval time of the process of electroosmosis nor equal to the duration of the charge capacious in the control object.