RU1798729C - Device for measurement of resistance of small value - Google Patents

Abstract

The invention relates to measuring technique, namely to measuring low resistances, and can be used to control the electrical resistance of the junction of conductors in various current conductors, in particular, for example, in the electrical circuits of distribution substations of electrical substations and on electrified rail transport when used rail lines for passing reverse current. The device contains a recording unit 1 and three push pins mounted at the same distance from each other, a computing unit 2, two amplifier limiters 5, 8, a threshold element 3, and an indication unit 4 connected by its input to the output of the threshold element connected the input to the input of the recording unit and the output of the computing unit, to the first input of which through the first amplifier-ogre - nickel a signal is supplied from the first two push contacts connected to the measured resistance, and to the second input through rer limiter is fed a signal from the second and third terminals connected to the reference current lead length. 1 ill. Hf yo

Description

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The invention relates to a meter - the signals are fed to the inputs of computer technology, namely the measurement of small unit 2, the output voltage of which is resistance, and can be used

to control the electrical resistance .. kC k I Rx Rx. R q of junction points of conductors in different: 5 k L) 0 k R0 Ro Xl active current conductors, in

in particular, for example, in electrical circuits where k 1 / Ro, i.e. this voltage is proportional to the size of the distribution busbars electro-to the value of the measured resistance. And on the electrified one, Rx. Since the resistivity of rail transport when using 10 g of standard conductors and current-carrying lines to pass the return dow is known, at a selected reference long-distance current .. not I of a conductor between electrodes 7 and 9

The aim of the invention is to simplify also the reference resistance of the device and the expansion of the region at R0 r0l, which allows a recording scale to enable the 15 block 1, which is responsive to the kRx signal, to measure small resistances. calibrate directly in units. The goal is achieved in that in the devices of the measured resistance Rx. for measuring the resistance, the outputs of the amplifier — In practical measurements, more often the limiters through the computer do not convert the absolute value of the resistance unit to the input 20 of the input Rx, but its correspondence to certain recording unit and input to threshold standards, for example, does not exceed whether there is a related element, the output of which is connected to the blocking of the connection point of the conductors of the display. . established standard. Therefore, signal c; Fig. 1 is a block diagram of the output of computing unit 2 supplied to the device. 25 also to the input of the threshold element 3. If

The device contains a recording value of this voltage that will exceed the unit 1, the input of which is connected to the output of the unlearned threshold of operation of element 3, of the computing unit 2 and with the input of the threshold at its output, a signal appears, and of the operation element 3 connected to its output - displays an indication block 4, signaling that there is no progress to the input of the indication block 4. The first 30 corresponds to the resistance value R. The input of the computing unit 2 is connected to the established norms, the output of the first amplifier-limiter b, the inputs of the computing unit 2 from in the course of which the first 6 and impulse noise from the current lead 11 are protected by shielding 7 push contacts or clamps, and by amplifiers with amplifiers-amplifiers, the second input of computing unit 2 is connected 35 5 and 8, the output signals of which are limited with the output the second amplifier is limited to an acceptable level for the inputs of the calculator 8. to the input of which a second level block 2 is connected if the level exceeds 7 and the third one; 9 push-buttons or contact-input signals of the amplifiers are limited. The pressure contacts of 6.7 and Etio-regulators of normal limits, determined with the same distance from each other by 40 ranges of resistance measurements Rx, and during the measurements, connect-R0, as well as the current in the conductor 11. s to the measured resistance 10 s The proposed device is advantageous because of Rx and the current-carrying conductor 11 of the reference length differs from the prototype in that it is very pro-Ic with resistance Ro. ; v by means of

The device operates as follows: the possibility of a sufficiently accurate measurement. . nor resistances of small magnitude. input

Claims (1)

In order to take measurements, the device of the device is reliably protected from impulse - it is connected by electrodes 6 and 7 to the measuring interference, which are widespread in the impedance Rx, and by electrodes 7 and back-ends because of the impulse, 9 - to the current path 11 of the reference length I with 50 thyristor control of voltage level - resistance R0. When flowing over and various pickups, which increases the current coproode of magnitude I, the voltage drop is the failure-free device, the measured resistance Rx is , A device for measuring the resistance at the reference resistance R055 of no small value, containing two arms. Do t Ro.Litel - limiter whose inputs These voltages are applied to the inputs and are connected to three contact amplifiers for the first 5 and second 8 amplification of the control object, distributed limiters having the same amplitudes K. The amplification factors K. After amplification 51798729 -6 recording unit, indication unit, small resistance, outputs amplifier element and computational unit, lei limiters via computational characterized in that, for the purpose, the unit is connected to the input of the recording simplification and expansion of the scope of the application block and the input of the threshold element, the output nor due to the possibility of measuring sopro-5 which is connected to the display unit.