SU1308950A1 - Device for determining insulation wear - Google Patents

Abstract

The invention relates to the field of electrical measuring equipment. The purpose of the invention is to increase the reliability of determining insulation wear. The device contains a power source 1, an insulation temperature meter 3 and an amplifier 4. The introduction of a time counter 2, an equivalent time counter 6 and a power unit 5 including a thermistor divider 7 and an amplifier 8 - it is possible to predict the operating time of the equipment depending on the state of the insulation. 1 hp f-ly, 1 ill. with S (L with about cf sd

Description

The invention relates to electrical measuring equipment and can be used in devices for determining the wear and tear of electrical insulation of electrical equipment, controlling the equipment of equipment under operating conditions, and predicting its operating time.

The purpose of the invention is to increase the reliability of determining the wear of an insulation and expand its functionality by providing the ability to predict equipment operation time depending on the insulation condition.

The drawing shows a diagram of the device.

The device contains a power supply 1, a time counter 2, an insulation temperature meter 3, a first amplifier 4, a power increase unit 5, a time counter 6 equivalent.

The first output of the power supply source 1 is connected to a counter 2 times, and the second output is connected through a series-connected insulation temperature meter 3 and the first amplifier 4 to a power input 5, the outputs of which are connected to the corresponding inputs of the equivalent time counter 6. The exponentiation unit 5 furthermore comprises a series-connected resistor-type rat divider 7 voltage and a second amplifier 8.

Sensor temperature meter 3 (not shown) is placed in the object under study. An equivalent time counter 6 is implemented on the basis of a magneto-electric, electrodynamic, or induction system, contains two windings, and measures the product of the sinal in time, arriving at this winding.

The device works as follows.

Preliminary, depending on the parameters of the insulation under study and its possible temperature range, the parameters of the elements of the resistor-thermistor voltage divider 7 are selected during testing. The exponent may be in the range from 9 to 16. Then, the power source 1 is connected simultaneously to the counter 2 times, the object under study (not specified) and measure

3 temperature- connected to the rest of the circuit. Time counter 2 determines the actual test time, i.e. device operation time. With an increase in, for example, the temperature of the object under study (and its isolation corTBeTCTaefiHO), the output pad of temperature meter 3 increases, since it is a function of the temperature of the object under study. This voltage is amplified by amplifier 4, and then enters block 5, where it is raised to a power whose value is preselected depending on temperature and insulation parameters.

The voltage raised to the appropriate degree from the outputs of the block 5 is supplied to each of the two windings of the counter 6 of equivalent time, as a result of which the disc of the counter 6 rotates faster equivalent to the wear of the equipment insulation, i.e. Insulation is stronger than at nominal temperature (for example + 25 ° C), and the service life of the insulation is correspondingly reduced. With an appropriate selection of the device elements, for example, the ratios of the resistances of the resistors and thermistors of the divider 7 and the parameters of the amplifier, the reading of the counter 6 corresponds to the total wear of the insulation.

The estimated time of work, the equipment is determined by the formula

Tn Takv, ian

prog

where T „

EQ.VISH

(Act

 EI8. II5 T | (JSTP

the nominal service life of the equipment; the time equivalent to the total insulation wear is determined by counter 6; the time actually worked by the equipment is determined by the counter 2.

The invention allows to determine the actual equipment life with high accuracy and reliability (how long it will work under these conditions, how to load it so that it will work for a specified number of years), and to determine the reliability and predict its durability by its wear rate. In addition, the invention makes it possible to quickly use equipment load conditions and to maneuver them accordingly. As a result, the economic effect of using the invention in power plants, power substations and other areas of the national economy is achieved by predicting the duration of operation. power equipment (generators, transformers, t, e,) their rational use, reducing the overall dimensions at the design and design stage.

Claims (2)

1. A device for determining insulation wear, comprising a power source and an insulation temperature meter connected in series and a first amplifier, characterized in that, in order to increase Editor M.Blanar Compiled by E. Berezov Tehred I.Popovich Proofreader A.Obruchar Order 1795/38 Circulation 731 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Design, And neither reliability of determination of insulation deterioration and expansion of functionality, a time counter, an exponential unit and an equivalent time counter are entered into the device, the first power supply output is connected to the time counter input and the second output to the insulation temperature meter input, the first output the amplifier is connected to the input of a power unit, the outputs of which are connected to the corresponding inputs of an equivalent time counter. 2. A device according to claim 1, characterized in that the exponentiation unit contains a resistor-connected voltage divider serially connected and a second amplifier, the outputs of which are connected to the outputs of the exponentiation unit, and the input to the RTD It is connected to the input of the exponential unit.