SU83474A1 - Method of synchronization of telegraph distributors with dedicated correction signals - Google Patents

Description

Existing systems of synchronous telegraph devices are usually corrected with either non-conventional or code pulses.

In both cases, the telegraph signals are distorted in the transmission channel and, when the correction device is operated, a more or less sharp change in the speed of the receiving distributor occurs, which causes swinging and reduces the stability of the communication.

When applying the proposed method of synchronization of telegraph distributors with dedicated correction signals, the above-noted drawbacks do not occur.

The frequency of the correction signals in the proposed method is obtained by dividing the frequency of the generator controlling the synchronous mask of the transmitting distributor. To obtain at the receiving point the same frequency as the frequency of the master oscillator at the transmitting point, the frequency of the correction signals at the receiving point is multiplied with the help of devices generating at a frequency very close to the controlling one. The frequency thus obtained is used to control the synchronous driver 11 and the distributor.

The drawing shows a diagram explaining the process of synchronization of telegraph distributors according to the proposed method.

A high-voltage generator, G, supplies voltage to a power amplifier, U, which feeds a synchronous CM power. The latter is connected by a single shaft with an electric motor ZD, which in turn is connected by a gear to a distributor shaft. Thus, the stability of the speed of the distributor P is determined by the frequency stability of the generator G.

There is a contact on the distributor P, from which correction pulses are sent to the line. The frequency of the supply to the line of correction pulses is related to the frequency of the generator by the ratio:

№83474-2

JzeH Corr

where: f ff-frequency generator;

2p is the number of pairs of poles of a machine synchrony; 2 - gear ratio; fк рр-frequency of correction pulses or / „„ L: /, „;, р, where:.

At the receiving point, the correction pulses are received through a special contact of the distributor P on two frequency multipliers U and Y connected in series. At the receiving point, the synchronous machine CM is also connected by a single shaft with the electric motor ED. This shaft in turn is connected to the shaft of the distributor P by means of the gearbox Red.

The product of the multiplication factors of the first multiplier / Ci and the second multiplier K is equal to the coefficient relating the frequencies / gene / correl 3 Transmission, i.e. K ,. The frequency of the current feeding the synchronous receiving machine will be equal to:

J reception A 1 A 2 U Corr 1gen

Thus, the frequency of the current feeding the synchronous machine to the receive distributor if is equal to the frequency of the current feeding the synchronous machine to the transfer distributor, and the speeds of the transmit and receive distributors exactly match. The phases of the receive and transmit allocators are tightly coupled and there is no corrective sway.

The stability of the system under consideration with respect to any interruptions in the flow of correction pulses to the receiving distributor is determined by the frequency stability of the generator of the first multiplier. The closer the frequency of the generator of the first multiplier / i to the harmonic with the sequence number K of the correction frequency, the longer the time allowed for the absence of correction pulses at the reception (L).

In the absence of correctional pulses at the reception, the frequency of the generator of the first multiplier / i will differ from K f corr

by the value of / reception K2 f The number of revolutions of the synchronous machine will be changed by the value of Dn G1raemp 2a time - synchronous machine receiving

2P Pt fnpUfMU

will rotate relative to the synchronous transmission machine one turn. In order to avoid linear synchronization during the absence of correction pulses at the reception (A /), the phase of the reception distributor relative to the transmission distributor must be changed by an amount less than turnover, where a is the value determining the design of the distributor.

Turning the phase of the distributor on - turn will correspond to turning the phase of the synchronous machine on - turn. Then A /, but DG --- - Hi / i reception /.

1 a / i, where 8 is stable