SU629510A1 - Quick-action registering device - Google Patents

Description

The invention relates to fixing devices for measuring and fixing the parameters of an emergency mode, the values of which determine the location of the damage on the transmission lines. Known fixing devices such as FIP for fixing values; short-circuit currents, according to the values of which determine the place of damage on the transmission line l. A common drawback of fixing instruments of the FIP type is that they require individual calibration curves for reading measured values. The transfer of measurement results is possible only in the course of measurement. The closest in technical essence to the proposed is a high-speed fixing device containing an input unit connected to the start-up unit, a voltage fixing unit connected via the decoder with the indicator 2j. The disadvantages of this device are 5al speed and a large enough own power consumption. The aim of the invention is to increase the speed by measuring the instantaneous values at a certain moment of the alternating current period. This is achieved by the fact that in the proposed high-speed fixing device containing an input unit connected to the start-up unit, a voltage clamping unit connected via a decoder to the indicator, one input of the fixation unit is connected to the input unit, the other input of the fixation unit is connected to the output of the start-up unit block containing a matching, start-up, and synchronization circuit connected to its input. a matching circuit and a delay circuit connected to its output, with one output of the matching circuit connected to the delay circuit via a serially connected synchronization circuit and a matching circuit, the second output of the matching circuit and one of the outputs of the delay circuit connected to the inputs of the start circuit whose output is connected to the input schemas with overlap. The ha drawing shows a block diagram of a high-speed fixture device. The high-speed fixation device contains the input unit 1, the start-up unit 2, and the fixing unit 3.

the voltage, the decoder 4 and the indicator 5. The input unit 1 includes transformers or transreactors with voltage dividers. The start-up unit consists of a matching circuit 6, a start circuit 7, a timing circuit 8, a matching circuit 9, and a delay circuit 10. The matching circuit of a 6-amplifier-limiter on three semiconductor triodes increases the input resistance and sensitivity of the start-up block 2. The start circuit 7 consists of an amplitude discriminator, a waiting meltivibrator, a coincidence circuit, and a trigger. The synchronization circuit 8 is assembled on the basis of the amplitudes of the 1st discriminator and the trigger. Delay circuit 10 - pending multivibrator. The voltage clamping unit 3 is built according to the semiconductor analog-digital converter circuit with intermediate conversion of the measured parameter to the time interval. The decoder 4 and the indicator 5 provide a visual reading of the instrument readings according to the decimal number system.

Voltage or short circuit current. (or both at the same time) is transformed by a transformer (transreactor) and via a voltage divider enters the start-up unit 2 and the voltage clamping unit 3. The triggering value, amplified by the matching circuit b, triggers the synchronization circuit 8 and, in the case of an increase in the start setting value , circuit 7, after a predetermined period of time, ensuring the elimination of the influence of the aperiodic component of the voltage or current, a potential appears at the output of the starting circuit, allowing the passage of a synchronizing pulse from the synchronization circuit 8 through the coincidence circuit 9 to the delay circuit 10. The delay circuit 10 ensures that the trigger circuit 7 is triggered once and the voltage clamping unit 3 is started by simultaneous occurrence of a synchronizing pulse or at a predetermined time interval. The time delay allows you to measure

g

instantaneous values of voltage or current at a specific point in a period. In the case of measuring the instantaneous values of the alternating voltage or short-circuit current, the measured value is simultaneously used as the triggering value. When determining the projections of the measured vector on the normal. or in the direction of the base vector, the device is started by the base current or voltage when the instantaneous value of the latter is zero

or as much as possible.

The use of a voltage clamp unit allows you to measure currents or voltages

short circuits without first storing them on a capacitor.

Claims (2)

1. USSR Author's Certificate No. 230981, cl. Q01 K 19/01, 1965. 2. USSR author's certificate number 316999, cl. G01 and 19/28, 1968.