SU1220955A1 - Arrangement for automatic control of voltage in contact-wire network - Google Patents

Description

2. The device according to claim 1, characterized in that the voltage measuring unit in the contact network is made in the form of a telemetry unit of voltage consisting of sensors: apr, the outputs of which are connected to the inputs of transmitting telemetric units connected to the outputs of the receiving telemetry units whose outputs are connected to one

f.

The invention relates to electrical engineering, in particular, voltage regulating devices used in electrified railway transport.

The purpose of the invention is to increase reliability.

Figure 1 is a functional scheme of the device; figure 2 - block diagram of the device.

The device consists of a telemetry unit 1 of voltage in a contact network, the inputs of which receive information about the voltage level of the cells (. And Bksg of inter-station zones. The output of block 1 is connected to block 2 for calculating voltage deviations in the contact network from a given value and block 3 limit values of the voltage. The outputs of blocks 2 and 3 are fed to the inputs of the determination unit 4 (LEVELS of voltage on the transformer of the substation. The output of block 4 is connected to the unit 5 forming voltage control commands on the transformer of the substation. Cig al exit from block 5 is passed to block controlled w - conductive voltage transformer substation (not shown).

The telemetry unit 1 of the voltage in the contact network consists (Fig. 2) of voltage sensors 6 and 7 to which telemetry units 8 and 9 are connected, the outputs of which are connected to the inputs of the receive units 0 and 11 of the telemetry connected to the inputs of logic elements OR-NOT 12 and 13, and counters 14.15, inputs T of which are connected to the outputs of the logs 1220955

they are from the inputs of logical inputs OR NOT, to the outputs of which one of the inputs of the meters are connected, the other inputs of which are interconnected with one of the outputs of the meters connected to other inputs of the logical OR elements NOT and the other outputs are the outputs of the telemetry unit in the contact network.

 OR elements are NOT-12 and 13. Block 2 (Fig. 1) for calculating voltage deviations in the contact network from a predetermined value consists (Fig. 2) of

generator 16 exemplary frequency, the output of which is connected to one of the inputs of logic elements AND NOT 17 and 18, the other inputs of which are connected to the outputs 1 of counters 14 and 15, and the outputs to the T inputs of counters 19 and 20, the outputs 1 of which are connected to R-inputs of the flip-flops 21 and 22, the S-inputs of which are connected to the outputs 1 of the counters 14

and 15. Block 3 (Fig. 1) of the selection of the limiting voltage values consists of flip-flops 23 and 24, the R-inputs of which are connected to the outputs 2 of the counters 19 and 20, the S-inputs to the outputs 1 of the counters 14 and 15, and the outputs - from the entrance

logical element AND-NOT 25. Block 4

(4 "rl) determining the voltage level on the transformer of the substation consists of a reference generator 26, the output of which is connected to one of the inputs of the logic element AND-NOT 27, the output of which is connected to the input of the 4-bit shift register 28, and the other inputs the outputs 4 of the counters 14 and 15, and the computation node, including the logical elements OR-NOT and NAND 29-32, the outputs of the elements 31 and 32 are connected to the inputs S and R of the trigger 33.

Block 5 (FIG. 1) of forming the voltage control commands of the transformer of the substation consists (FIG. 2) of a reversible counter 34, the inputs of which are connected to the outputs of the trigger 33 and output 2 of the register 28, and the outputs to the inputs of the digital-analog converter 35. The outputs 1 and 3 registers 28 are connected respectively to the inputs of the elements 31, and 32, and the R inputs of the counters 14, 15, 19 and 20.

The system works as follows.

The voltage level in the contact network is transformed into a frequency proportional to it using voltage sensors 6 and 7. Information in the form of a frequency-modulated signal about the voltage level in the contact network via communication channels consisting of blocks 8 and 9 of the receiving line blocks 10 and 11 enters the division of one period.

The pulses from element 12, 13 enter the inputs T of the counters 14 and 15. When the first pulse arrives, the counter 14 (15) switches to the first position, and a positive potential appears at output 1. With the arrival of the second pulse, the counter 14 (15) switches to the second position, and a positive potential appears at the output 2 of the counter, closing the element 12 (13) and at the output 1 a positive pulse is formed, the duration of which is equal to the duration of the input signal period.

 -h, ..

The pulse from the output 1 of the counter 14 (15) is fed to the inputs of the Trigger 21 (22), setting it to a single position, and the logic element 17 (18). The pulses from the generator of the reference frequency 16 begin to flow to the input T of the counter 19 (20). The pulse at the output 1 of the counter 19 (2O) is in the case when the counter counts the number of pulses of the generator of the reference frequency corresponding to a given voltage. If the period of the input signal is longer than the duration of the time interval corresponding to the specified voltage Vj, then the counter 19 (20) will have time to count the required number of pulses and a positive pulse is output at its output 1 which will trigger the trigger 21 (22) to the zero position. If the pulse duration at the output 1 of the counter 15 (14), corresponding to the duration of the period of the input signal, is insufficient, then the pulse at the output 1 of the counter 19 (20) fails and the trigger 21 (22) remains in the single position.

2209554

Thus, after comparing the duration of the period (the input signal with a given single position of the trigger 21 (22) will indicate

5 that the duration of the input signal period is less than the specified one and, accordingly, the voltage in the contact network is greater than the specified one. If trigger 21 (22) switches to zero voltage, then this corresponds to the fact that the voltage in the contact network is less than the specified one.

The signals from the outputs 1 of the flip-flops 21 and 22 are fed to the inputs of the logic

15 of the element 29, the node of the calculation of block 4 functions in accordance with the algorithm presented in the table.

.-R

To increase the voltage, the signal from the output O of the element 29 opens element 31 and impulses the trigger 33 from the block 4 to the single position. To reduce the voltage on the transformer of the substation, the signal from element 30 opens element 32 and the pulse from block 4 triggers 33 to the zero position.

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Unit 4 serves to generate 50 three control pulses and operates in the following manner.

After setting the counters 14 and 15 to the second position, the positive pulses from the outputs 4 arrive at 55 element 27, while the pulses from the generator 26 through the element 27 arrive at the input T of the shift register 28. As a result, the outputs 1,

2, A register is formed in sequence of three pulses. The impulse from output 1 triggers the trigger 33 in accordance with the operation of the computation node, the impulse from output 2 goes to the input T of the counter 34. The impulse from output 4 sets to the initial position the counters 14, 15, 19 and 20.

When a pulse arrives at the input T of the counter 34, its state changes in accordance with the position of the trigger 33. If the trigger 33 is in the single position, the state of the counter increases by one step. Each state of the counter 34 corresponds to a certain voltage level at the substation transformer. A digital-analog converter 35 is connected to the outputs of the counter 34, which directly controls external devices that change the voltage level of the transformer of the substation.

Triggers 23 and 24 work similarly to triggers 21 and 22. When the voltage level in the contact network is increased above the limit U ,. the period of the input pulses decreases and the pulses at the output 2 of the counter disappear

19 and 20, while trigger 23 and 24 remain in the excited position. As a result, a positive signal appears at the output of element 25, which is fed to the input of element

29. The calculation node in accordance with the table will give a signal for lowering the voltage level at the transformer of the substation regardless of the signals coming from the flip-flops 21

and 22. Lowering the voltage level on the transformer of the substation will occur until the voltage on the contact network falls below the limit value.

FIG. 2

Compiled by J.Gavrilov Editor M.Tovtin Tehred L.Oleinik Proofreader M.Samborska

Order 1531/20 Circulation 647 Subscription

VNIIPI USSR State Committee for Inventions and Discoveries 4/5, Moscow, Zh-35, Raushsk nab. 113035

Branch PSh1 Patent, Uzhgorod, st. Project, 4

Claims (2)

1. DEVICE FOR AUTOMATIC / VOLTAGE VOLTAGE CONTROL IN CONTACT NETWORK, containing blocks for measuring, extracting limit values and calculating deviations of voltage in the contact network from the set value and series-connected blocks for determining the voltage level and generating voltage control commands on the substation transformer, characterized in that, in order to increase reliability, the outputs of the voltage measuring unit in the contact network are connected respectively to the inputs of the limit value allocation unit and the input of the unit for calculating voltage deviations in the contact network from the rear values, connected by the outputs to the corresponding inputs of the unit for determining the voltage level on the transformer of the substation. > FIG. 1 2. The device according to claim 1, characterized in that the voltage measuring unit in the contact network is made in the form of a voltage telemetry unit, consisting of voltage sensors, the outputs of which are connected to the inputs of the transmitting telemetry units, connected by the outputs to the ί inputs of the receiving telemetry units, the outputs of which connected to 1.220955. them from the inputs of OR-HE logic elements, to the outputs of which one of the inputs of the meters is connected, the other inputs of which are interconnected, some of the outputs of the meters are connected to other inputs of the OR-HE logic elements, and the other outputs are the outputs of the voltage telemetry unit in the contact network.