SU1457063A1 - Automatic operator for controlling the number of parallel-operating power transformer substation - Google Patents

Abstract

The invention relates to the control of the modes of power system elements and is intended for the automatic control of the number of parallel-running power transformers at two transformer substations. The purpose of the invention is to expand the functionality by using transformers with any ratio of their powers. This goal is achieved by introducing four HE elements (13, 14, 15, and 18) and six logical elements AND (10, 11, 12, 16, 17, and 19) into the device, which allows, depending on the load of the substation and to minimize The losses in transformers will automatically maintain in the switched on state either one transformer 23 of lower power, or another transformer 24 of higher power, or both of these transformers - 3 sludge. (L with sd O) with

Description

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The invention relates to the control of the modes of power system elements and is intended to automatically control the number of parallel-running power transformers of two-transformer substations.

The purpose of the invention is to expand the functionality by using transformers with any ratio of their capacities.

FIG. 1 shows the block diagram of an auto operator for transformers of different power} in FIG. 2 10

Tely 29 and 30 transformer 23 and. switches 31 and 32 transformer 24.

The auto operator works as follows.

In the initial state, the first power transformer 23 is turned on, and the second 24 is disconnected. If -with B.to switching of transformers. Will not occur, since there is no signal at the outputs of logic gates And 6.7 and 11 for the following reasons., Element And 16 is closed at the first input.

load diagram of the substation and diagram 15 Logical O from the output of the element 16

we are transformer operation} in FIG. 3- dependence, power losses from the load of the substation for cases when the transformer of lower power is turned on, the transformer of greater power and both.

FIG. 3 designates power - 5d load, at which it is advisable to switch from a transformer of lower power to a transformer of higher power under the condition of minimum loss, power Sg- - load, at which it is advisable to switch to operation of two transformers; LR losses from substation load.

The auto operator contains an energy meter 1 with a pulse sensor, - a pulse counter 2 with a counting input, the first 3 and second 4 triggers, the first logical element NOT 5, the first 6 and the second 7 logical elements: And, the source unit 8, the unit 9 of the cycle, the third 10, fourth 11 and fifth fifth logical elements And, the second. 13, third 14 and fourth 15 logical elements NOT, sixth 16 and seventh 17 logical elements AND, fifth logical element NOT 18, eighth logical element And 19.

20

25

is inverted into 1-HE element 18, which from its output is fed to the second input of the AND 10 element, to the first: the input of which is fed logical 1 from the output of the AND 19 element. Logical 1 from the input of the AND 10 element is fed to the input of the HE element. 13, and the logical O from its output maintains in the closed state the element AND 7 at the fourth input and the element 11 at the first input. At the same time, logical O from the output of trigger 3 is supplied to the third input of the element 6.

If the BTP .SO.TO on the first output of the pulse counter 2 appears a signal that goes to the single input of the trigger 3, and the output of the last appears logical 1. Therefore, the third input of the AND 6 element

35 is supplied 1. At the first input of the element AND 6, there is 1, which is inverted by the element NOT 15 from O from the output of the element 12, closed at the first input connected to the output of the element 11. At the fourth input of the element 6 it receives 1 from the output element is NOT 5, it is inverted from O at the output of trigger 5, until then.

thirty

40

while S; Sf.iC signal appearance

while S; Sf.iC signal appearance

 II and

The inputs of the energy meter 1 connected to the 45 at the second input of the element I 6, lifted to the voltage transformer 20 connected to the output of the second set point connected to the voltage on the cable 9, appear at the output of the substation and to the transformers 21 and 22 currents, the primary windings of which

50

the first 23 and second 24 power trans, formers, are included in the chains, respectively, while the secondary ones are connected for the sum of the currents. The inputs of the execution unit 8 are connected to the first logical element I 6 through diode 25, to the second element I 7 through diode 26. i. the fourth element And 11 through the diodes 27 and 28, and the outputs are connected to the bus off and on,

55

an item; 6, which enters the second and fourth inputs of the executive unit 8. Block 8 generates a direct impact, which from the second output switches on switches 31 and 32 of the second transformer 24 and from the fourth output, and turns off switches 29 and 30 of the first transformer, transfer the load from the first transformer 23 to the second 24 Before the transformer 23 is disconnected from one hundred. elements and 7 and 11 are not me

Tely 29 and 30 transformer 23 and. switches 31 and 32 transformer 24.

The auto operator works as follows.

In the initial state, the first power transformer 23 is turned on, and the second 24 is disconnected. If -with B.to switching of transformers. Will not occur, since there is no signal at the outputs of logic gates And 6.7 and 11 for the following reasons., Element And 16 is closed at the first input.

Boolean O from the output of the element I 16

Boolean O from the output of the element I 16

is inverted into 1-HE element 18, which from its output is fed to the second input of the AND 10 element, to the first: the input of which is fed logical 1 from the output of the AND 19 element. Logical 1 from the input of the AND 10 element is fed to the input of the HE element. 13, and the logical O from its output maintains in the closed state the element AND 7 at the fourth input and the element 11 at the first input. At the same time, logical O from the output of trigger 3 is supplied to the third input of the element 6.

If the BTP .SO.TO on the first output of the pulse counter 2 appears a signal that goes to the single input of the trigger 3, and the output of the last appears logical 1. Therefore, the third input of the AND 6 element

supplied 1. At the first input of the element And 6 there is 1, which is inverted by the element NOT 15 from O from the output of the element 12, closed at the first input connected with the output of the element 11. At the fourth input of the element 6 it receives 1 from the output of the element NOT 5, it is inverted from O at the output of trigger 5, until then.

while S; Sf.iC signal appearance

 II and

At the second input of the element And 6, connected to the output of the second setpoint 9, a signal appears at the output

an item; 6, which is fed to the second and fourth inputs of the execution unit 8. Block 8 generates a control action, which from the second output switches on switches 31 and 32 of the second transformer 24 and from the fourth output, and switches off switches 29 and 30 of the first transformer, transfer the load from the first transformer 23 to the second 24. Before switching off the transformer 23 from one hundred. element elements 7 and 11 do not

ten

to turn on the power transformers 23 and 24.

From the position when both transformers are turned on, with a decrease in load, transition to state B tr is possible and then only transformer 24 remains in operation, and

5 ", then only the transformer 23 remains in operation.

with . After the transformer 23 is disconnected, the output of the element NO 13 appears 1, which is fed to the fourth input of the element 7 and the first input of the element 11. But signals are output. The elements 7 and 11 are missing because the third input of the element ... ..... .. „. Fr.rma

And 11 is fed O from the output of the trigger 4, to the state S, and to the first input of the element I 7 is fed

O from the output of the HE element 14. After turning on the transformer 24 and turning off the transformer, the logical 1 appears at the output of the AND 17 element, which is fed to the first input of the AND 12 element, and the logical O, which is fed to the third input of the element AND 16 and its output remains the logical O. Logic 1 from the output of the element NOT 18 is fed to the second input of the element AND 12, which opens, closing the element AND 6 on the first input, and does not let

15

20

In the first case, Sg.S, n S switching occurs in the following way. The signal at the second output of the counter 2 pulses disappears. After resetting from the first output of the setting device 9, a logical O is set at the output of the trigger 4 and the output of the element HE 5 appears 1, which is fed to the fourth input of the element AND 6. At the first output of the counter 2, the signal does not disappear and from the output of the trigger 3 1 the third input of the element is And 6. At the same time, a trap appears. .., i s i-jtnrnj nolvlyets LO-

c oZZLG inclusion of grass-25 gichesk 1 at the output of the element And 16,

The Formator 24.

which is inverted by the element HE 18 into a logical one supplied to. the second input element is And 12. At the output of element And 12 a logical

With a further increase in the load, when 5tp Sg., A signal appears at the second output of the pulse counter 2, which is fed to the single input of trigger 4, At the output of trigger 4, logical 1 appears, which is fed to the third input of the element 11. At the first the input of the element 11 is fed 1 from the output-element NOT 13, since the transformer 23 is disconnected, and the fourth input is fed 1 from the trigger 3, such as Vn,. Therefore, when a pulse 11 is applied to the second input of the element 11 from the second output of the setting device 9, the signal from the output of the element 11 11 sends a signal to the first and second inputs

35

40

which is inverted by the element HE 18 into a logical one supplied to. the second input element is And 12. At the output of element And 12 a logical

O, which is inverted by the element NOT 15 in 1. From the output of the element NOT 15, logical 1 is fed to the first input of the element AND b-. When a signal arrives from the second output of the setting device 9 to the second input of the element I 6, its output resembles the signal to the fourth input of the execution unit 8 for d., Disconnecting the transformer 23 and to the second input of the unit 8 for confirming. The inclusion of the transformer 24. Elements 7 and M. their state is not changed, since at the first input of the element And 7 remains O, and

the third input of the element 11 of the preferred block 8. Herewith, from the first output 45, after the transformer 23 is disconnected, logical o from the output of the element 19 is fed to the third input of the element 16 and closes it. On: the second input of the element And 12 is fed logical 1, it opens and the element And 6 closes at the first

the stroke of the block 8 receives a signal. the inclusion of the transformer 23, ac., the second output is a signal confirming the inclusion of the transformer 24, C. of this moment, both transformers 23 and 24 are in operation. The state .. of the elements 6 and 7 does not change, since the fourth input of the element 6 and the third input of the element 7 gives logical O from the element NOT 5. After switching on the transformer 23 At the output of the element HE, 13 appears O and the element AND 11 closes at the first input, excluding repeated pulses.

50

input, excluding the repetition of the signal to turn off the transformer 23.

55 In the second case, when the load from the value of S Sg- changes immediately to SST 5d, the switching takes place as follows. On both outputs of the counter 2 pulses signals

 ..

0

to turn on the power transformers 23 and 24.

From the position when both transformers are turned on, with a decrease in load, transition to state B tr is possible and then only transformer 24 remains in operation, and

5 ", then only the transformer 23 remains in operation.

.. ...... .. „. F.rma

same to the state s,

In the first case, Sg.S, n S switching occurs in the following way. The signal at the second output of the counter 2 pulses disappears. After resetting from the first output of the setting device 9, a logical O is set at the output of the trigger 4 and the output of the element HE 5 appears 1, which is fed to the fourth input of the element AND 6. At the first output of the counter 2, the signal does not disappear and from the output of the trigger 3 1 the third input of the element is And 6. At the same time, a - - appears. .., i s i-jtnrnj nolvlyets LO-

physical 1 at the output of the element And 16,

25 guic 1 at the output of the element And 16

thirty

35

40

which is inverted by the element HE 18 into a logical one supplied to. the second input element is And 12. At the output of element And 12 a logical

O, which is inverted by the element NOT 15 in 1. From the output of the element NOT 15, logical 1 is fed to the first input of the element AND b-. When a signal arrives from the second output of the setting device 9 to the second input of the element I 6, its output resembles the signal to the fourth input of the execution unit 8 for d., Disconnecting the transformer 23 and to the second input of the unit 8 for confirming. The inclusion of the transformer 24. Elements 7 and M. their state is not changed, since at the first input of the element And 7 remains O, and

input, excluding the repetition of the signal to turn off the transformer 23.

55 In the second case, when the load from the value of S Sg- changes immediately to SST 5d, the switching takes place as follows. On both outputs of the counter 2 pulses signals

no, and at the outputs of the flip-flops 3 and 4 a logical O is set. From the output of the element HE 5 1 is fed to the third input of the element 7 and on. the second input of the element AND 16, the output of which appears logical 1. Therefore, a logical O is fed to the second input of the element AND 10 from the output of the element NOT 18, the output of the element 10 comes in a logical O O, and from the output of the element HE 13 the fourth input of the element And 7 is supplied 1. When the signal from the second output of the setting device 9 is sent to the second input of the element And 7, the signal from the output of the last goes to the third input of the execution unit-8 for switching off, the transformer 24 and the first

The element is NOT connected to the first inputs of the first and second I logic elements, the outputs of which are connected to the first and second inputs of the executive unit, respectively, while the zero inputs of the pulse counters and triggers, as well as the second inputs of the AND logic elements

0 are connected to the outputs of a cycle cycle, characterized in that, in order to extend the functionality by using tsformatorov with any ratio

5 power capacities, it is equipped with the Four logical elements NOT, six logical elements I. and four dyads, and the output of the third element I is connected through the second logical

the input of block 8 for confirmation on- 2o; the element is NOT with the second input of the second

Transformer 23, Elements 6 and 11 do not change their state due to the fact that the third input element I 6 and on. the fourth input of the element 11 is a logical O from the output of the trigger 3, after the transformer 2A is disconnected, the output of the element 17 becomes 0, which is applied to the first input of the element 16. The signal at the output of the element 16 disappears and 1 appears the second input by the elements 10, which opens. Since the output element NO 13 appears O, the element And 7 is closed at the fourth input, eliminating repetitive signals to turn off the transformer 24.

Thus, the proposed auto operator ensures that the substation is kept at a minimum. Loss due to any change in load. In this case, an auto operator is able to maintain this mode at a transformer substation with any ratio of transformer powers.

Claims (1)

Formula iso.bret An auto operator to control the number of parallel-working power transformers of a two-transformer substation with switches that contains an energy meter with outputs for connecting to the current and voltage of the substation connected to the counter of the pulses with counting and zero outputs, two outputs of which are connected to single inputs triggers, the outputs of the first trigger directly, and the second through the first log30 35 AND logic gate and the first input of the fourth logic block AND, the output of which is connected via diodes to the third and fourth inputs 25 of the execution unit, the first output of which is connected to the bus, disconnects the switches of the first transformer, second output - to the disconnecting bus of the second transformer switches, third output - with The switch-on switch width of the second transformer is the fourth output - with the switch-on bus of the switches of the first transformer, and the third and fourth inputs of the executive unit are connected via diodes to the outputs Actually, the second and first logical elements are AND, the input of the second logical element AND is connected via the third logical element NOT with the output of the first trigger, and the fourth input is connected with the first input of the fourth logical element AND, the second input of which is connected to the second output of the setpoint of the loop, mp the third input is to the output of the first trigger and the fourth input of the fourth logical element I is connected to the input of the first logical element NOT, with the single output from the third input of the first logic element I, whose fourth input is connected to the fourth logical element NOT with the output of the fifth logical element AND, the first input of which is connected to the second input of the third logical element AND through the fifth logical element NOT with the output of the logical logical element AND, and the second input of the fifth element I with the output of the seventh 40 45 50 55 570636 The comic element is NOT connected to the first inputs of the first and second I logic elements, the outputs of which are connected respectively to the first and second inputs of the execution unit, while the zero inputs of the pulse counter and triggers and the second inputs of the logic elements AND 0 are connected to the outputs of the cycle reference frame, characterized in that, in order to expand the functional ones. capabilities by using transformers with any ratio 5 power, it is supplied with Four logical elements NOT, six logical elements I. and four diodes, and the output of the third element I is connected through the second logical about; element is NOT with the second input of the second 0 five the logical element And the first input of the fourth logical element And, the output of which is connected via diodes to the third and fourth inputs 5 of the execution unit, the first output of which is connected to the tripping bus of the first transformer breakers, the second output to the tripping bus of the switches of the second transformer, third output with the switch-on switch length of the second transformer, the fourth output with the switch-on bus of the switches of the first transformer, and the third and fourth inputs of the execution unit are connected via diodes to the outputs of the second and first logical elements And, the third input of the second logical element And is connected via the third logical element NOT to the output of the first trigger, and the fourth input to the first input of the fourth logical element And, the second input of which is connected to the second output of the setpoint controller, the third input - to the output of the first trigger, and the fourth input of the fourth logical element I connected to the input of the first logical element NOT connected to the third input of the first logical element AND, quarters whose input is connected “through the fourth logical element NOT to the output of the fifth AND logical element, the first input of which is connected to the second input of the third logical AND element and through the fifth logical element NOT to, the output of the logical logical element AND, and the second input p of that element And - with the release of seven five 0 five the first logical element I. and the first input of the sixth logical element And, the second input of which is connected to the output of the first logical element NOT, and the third input - to the second input of the third logical element And and the output of the eighth logical element And connected to the inputs of the closing contacts of switches the first transformer, and the closing block contacts of the switches of the second transformer are connected to the inputs of the seventh logic element I. Srn ff $ a .-Tl iT O 2T ABOUT M m Fie.2 1ДЯ 25 and 24  tp