SU409145A1 - FREQUENCY DEFAULT INDICATOR - Google Patents

Description

The invention relates to the field of electrical power engineering and can be used to create devices for re, oscillating, stabilizing and measuring the frequency of generators.

The known frequency deviation indicators, which contain triggers, coincidence circuits, Pierce elements, and pulse shapers, do not provide measurements in a wide frequency range. As a result, they cannot be used to automatically track changes in frequency.

The purpose of the invention is to expand the working frequency range and create opportunities to compare multiple frequencies.

This is achieved by the fact that in the: Frequency Frequency Channel, to obtain the AND: pulses that are delayed relative to each other, three-digit 1CH1 ratios are used (on triggers and coincidence circuits.

The drawing shows a block diagram of the proposed indicator.

The indicator contains triggers 1, 2 and 3 with counting inputs., Schemes 4 and 5 match, schemes "OR-NOT 6 and 7, forming a beat with potential inputs, the second pair of schemes 8 to 9, matches". OR-NOT 10 and //, which form the trigger of the sign of the frequency deviation, the pulse shaper 12 and the output circuits 13 and 14 of coincidence.

The indicator works as follows.

A three-bit counter on the triggers /, 2 "3 becomes dumber in eight states. Each state is stored for a time, ipaBHoe repetition period 5 LIA reference pulses and can be allocated in the form of eight pulses, the duration of which is equal to the repetition period oinopHbix immp. For proper operation of the device / it is necessary to distinguish three arrows: the first, the third and the fifth (the zero point is from the zero state of all three triggers). The states of the triggers that correspond to these imouls. M can be written down as follows: Tz That TI L - the first impu; Tsz-T2-T | B - the third Impulse; Тз Т2 Т С - fifth and .pulse;

where t | , T2, Tz - single states of trigger 2 and 3 and, respectively, the presence of sigr 1, cash on the outlets;

T |, Ta, Tz - zero states of the triggers and, accordingly, the presence of sipnal on the bullet output;

A, B, C - the letter designation of events corresponding simultaneously to the appearance of the sitals at the outputs of the triggers.

When applying pulses of the reference frequency / compared frequency / o, three different situations can occur at the device input. If a