SU808947A1

SU808947A1 - Resistance meter

Info

Publication number: SU808947A1
Application number: SU792750296A
Authority: SU
Inventors: Людмила Евгеньевна Максимова; Евгений Сергеевич Павленко; Анатолий Миронович Чернов
Original assignee: Maksimova Lyudmila E; Pavlenko Evgenij S; Chernov Anatolij M
Priority date: 1979-04-12
Filing date: 1979-04-12
Publication date: 1981-02-28

Description

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I Изобретение относитс к электроизмерительной технике и предназначено дл измерени электрических сопротивлений высоковольтных объектов.I The invention relates to electrical measuring equipment and is intended to measure the electrical resistances of high voltage objects.

Известны мостовые измерители сопротивлени , содержащие источник питани , усилитель, измерительную схему, нуль-орган.Bridge resistance meters are known, comprising a power source, an amplifier, a measuring circuit, a null organ.

Однако эти мостовые измерители нельз использовать дл измерени сопрой1влени при напр жени х выше 10-100 кВ, так как дл реализации смежного с объектом измерени , но лежащего в противоположной токовой ветви моста плеча требуютс более точные , чём объект исследовани , измерительны высоковольтные резисторы, которые громоздки, не имеют метрологического обеспечени , дороги.However, these bridge meters cannot be used to measure co-current at voltages higher than 10-100 kV, since in order to realize an arm voltage, which is adjacent to the measuring object, but lying in the opposite branch of the bridge, more high-voltage resistors that are bulky do not have metrological assurance, are expensive.

Наиболее близким по технической сущности к предлагаемому вл етс высоковольтный мост посто нного тока дл измерени сопротивлени , плечи которого образуют схему одинарного моста, содержащий источник высокого напр жени , зажимы дл подключени объекта измерени и нуль-индикатор.The closest in technical terms to the present invention is a high voltage DC bridge for measuring resistance, whose shoulders form a single bridge circuit containing a high voltage source, clamps for connecting a measurement object and a null indicator.

Недостатком этого устройства вл ютс ограниченные функциональные возможности.A disadvantage of this device is its limited functionality.

Цель изобретени - расширение функциональных возможностей.The purpose of the invention is to expand the functionality.

Цель достигаетс тем, что в измеритель сопротивлени , содержащий источник напр жени , мост, зажимы дл подключени объекта измерени , образующие ,.плечо объекта измереии - моста, ci«ll)rcHoe с ним первое масштабирующее плечо моста и противолежащее первому The goal is achieved by the fact that the resistance meter containing a voltage source, a bridge, clamps for connecting a measurement object that forms, on the shoulder of the measurement object, a bridge, ci "ll) rcHoe with it, the first scaling arm of the bridge and opposite to the first

O второе масшгабируюцее плечо моста, квантующее плечо-цифратор моста, противолежгикее плечу объекта измерени моста, и иуль - индикатор, соединенный с одной из измерительной 5 диагонали моста одним выводом, введен управл емый резистор и блок запоминани напр жени , соединенный с другим выводом нуль-индикатора и второй вершиной измерительной диагонали 0 моста, втора диагональ которого образована управл емым резистором, а источник напр жени включен последовательно с объектом измерени в плечо объекта измерени .O the second bridge shoulder, the quantizing bridge numerator, the opposite shoulder of the bridge measurement object, and the il indicator connected to one of the bridge diagonal 5 with one terminal, a controlled resistor and voltage storage unit connected to the other zero terminal are inserted the indicator and the second vertex of the measuring diagonal 0 of the bridge, the second diagonal of which is formed by a controlled resistor, and the voltage source is connected in series with the object of measurement to the arm of the object of measurement.

На чертеже представлена принципиальна схема измерител сопротивлени .The drawing shows a circuit diagram of a resistance meter.

Claims

The resistance meter contains clamps 1 and 2 for connecting in series the measurement object 3 with resistance R and voltage source 4, scaling the shoulder 5 -c resistance g, opposite the last scaling beam 6 resistance Rg, quantizing the digitizer 7 s resistance r, zero indicator B connected in series with voltage storage unit 9. The controlled resistor 10. The device operates as follows. At the time of connection to the terminals 1 and 2 of the object 3 measurement with the measurement e-. By the resistance RX and the voltage source 4 with the voltage H the resistance of the resistor 10 is zero. In this case, the voltage is distributed along a chain of series-connected resistances Ry and RQ. The voltage at the input of the null indicator 8, which is equal to memorized by the voltage storage unit 9, is compared with the voltage at the input of the zero indicator 8 at the moment when the resistor 10 is zero. At the same time, the voltage at the indicator zero input is equal to VVV where TQ is the resistance of the first mass of the tabulating arm 5, g Vjue is the resistance of the quantum digitizer arm In the equilibrium position of the bridge we have Sftoti / AG where it follows that Thus the proposed resistance meter unlike solves the problem of measuring the resistance of ultra high voltage objects without using ultra high voltage resistors in the measuring circuit. This makes the resistance meter compact, easy to use and cheap. Claims An impedance meter comprising a voltage source, a bridge, clips for connecting a measurement object, forming a shoulder of a bridge measurement object, adjacent to it a first scaling shoulder of a bridge and opposite to a first second scaling shoulder of a bridge, quantizing a bridgeframe bearing, opposite to the shoulder of a bridge measurement object, a null indicator connected to one of the vertices of the measuring diagonal of the bridge by one terminal, characterized in that, in order to expand its functionality, it is introduced by the controller A new resistor and voltage storage unit connected to another output of the null indicator and the second vertex of the measuring diagonal of the bridge, the second diagonal of which is formed by a controlled resistor, and the voltage source is connected in series with the measurement object in the arm of the measurement object.