SU1010696A1 - Device for automatic connection of standby ac voltage source - Google Patents

Abstract

DEVICE FOR AUTOMATIC INPUT OF THE RESERVE VOLTAGE SOURCE, containing two square pulse shapers and an accident analysis unit, characterized in that, in order to increase its speed and reliability, it is equipped with a functional operation unit, a stable frequency generator, a comparator unit and a measurement unit, with a frequency measurement unit, a measurer, a unit, and a measurer. sensors, monitored voltage sensors are connected to the first inputs of rectangular pulse shapers, and stable frequency generator outputs are connected to their second inputs , block, functional operations consists of two elements NOT, three elements AND, element OR, and element OR NOT, and the first element AND, the first inputs of the second and third elements AND and the first input of the element are NOT connected to the first input of the functional operations block OR-HEj to the second input of the functional operation block are connected via the second element NOT the second input of the second element AND, the second inputs of the first and third elements AND the second input of the element OR-NOT, the third input of the third element AND connected to the third input in the functional operation block, the first OR element is connected to the outputs of the first and second elements, whose output is the first output of the functional operations block, and the outputs of the elements OR NOT. and the third element And are respectively the second and third outputs of the functional operation block; the comparison block consists of the trigger distributor, whose inputs are the first and second inputs of the comparison block, respectively, and the first input of the counter-matching element, the outputs which are the first and second outputs of the comparison unit, respectively, the second input of the comparison unit is connected to the second input of the counting / comparing element, the third input of which is the third input of the comparison / n unit none; The unit for measuring the rate of change of the angle consists of a RAM element whose input 05. is the input of the unit for measuring the rate of change of the angle to which O) one input of the decoder is connected, the second input of which is connected to the output of the RAM element, and the output is the output of the unit measuring the rate of change of the angle; alarm block analysis consists of OR logical elements, OR-NOT and two chains of consecutively connected AND logic elements, memory element and NAND logical element, whose outputs are the first and second outputs of the accident analysis unit, the first and second

Description

the inputs of which are the inputs of the OR element, the third and fourth inputs of the first and second elements AND, respectively, the fifth and sixth inputs are the inputs of the OR NOT element, and the output of the OR element is connected to the second inputs of the AND elements, to the second inputs of the memory elements, the output of the element OR is NOT connected to the third inputs of the memory elements, the fourth inputs of which are connected to the outputs of the memory elements of the parallel chain; The first and second inputs of the functional operation unit are connected respectively to the outputs of the first and second rectangular pulse shapers, the third input of the functional operation unit is connected to the output of the stable frequency generator, and the outputs of the functional operation unit are connected respectively to the three inputs of the comparison unit, the first output of which is connected through the measuring unit the rate of change of the angle with the first input of the accident analysis unit, to the second input of which the second output of the comparison unit is connected, to the third and fourth To the inputs, respectively, the outputs of the first and second rectangular pulse drivers, the fifth and sixth inputs are intended to be connected to the protection outputs of the first and second bus sections, and the outputs of the accident analysis unit are intended to be connected to the disconnecting circuits of the first and second power switches tire sections.

The invention relates to emergency control of power supply and can be used as a fast-acting unit for automatic input of a reserve iABP) of various consumers that do not allow interruptions in power supply, especially at substations with synchronous load.

A device for automatically switching on a backup power source, which implements a known method for automatically switching on a power supply to consumers, consisting of a phase-receiving unit connected via voltage transformers to a backup and main power sources, a frequency unit connected via a voltage transformer to the main unit, compare the phase-sensitive and frequency blocks are connected to the inputs, and the output is connected to the automatic switching-on unit O

The known device has a low speed, since the failure of the main source is determined by the angle between the voltage vectors of the main and backup power sources reaching 120-150 °.

The closest to the proposed technical entity is a device for automatic input of a backup source of alternating voltage, having an analyzer of magnitudes of monitored voltages, two of the voltage analysis block and the frequency of sources C-

Known device as

Power source performance evaluation parameters use voltage and frequency, which change slowly when the source is damaged, which reduces its speed.

In addition, the reliability of the device is reduced due to the use of a stand-alone block generator in the frequency analyzer in the frequency analyzer, which, as a result of an input voltage jump, temperature change, and other parameters, can be switched to autogeneration.

The purpose of the invention is to increase the speed and reliability of the device.

The goal is achieved by the fact that a device for automatically inputting a backup source of alternating voltage containing two square pulse shapers

and an accident analysis unit, equipped with a functional operation unit, a stable frequency generator, a comparison unit 310, and an angle measurement rate measuring unit, sensors are controlled by voltages connected to the first input of the rectangular pulse drivers, and a stable frequency generator unit is connected to their second inputs functional operations consists of two elements NOT, three elements AND, element OR, and element OR-NOT, and the first element AND, first is NOT connected to the first input of the functional operation block The second inputs of the second and third components AND, and the first input of the element OR NOT, the second input NOT the second input of the second element AND, the second inputs of the first and third elements AND and the second input of the element OR NOT, the third input are connected to the second input of the functional operation block. the third element AND is connected to the third input of the functional operations block, to the outputs of the first and second elements AND the first OR element is connected, the output of which is the first output of the functional operations block, and the outputs of the OR-NOT elements and the third AND element The second and third outputs of the functional operation block, respectively, the comparison block consists of the trigger distributor, whose inputs are the first and second inputs of the comparison block, respectively, and the first input of the counter-matching element, the outputs of which are the first and second outputs, is connected to the output a comparison unit, respectively, a second input of the counting element is connected to the second input of the comparison unit, the third input of which is the third input of the comparison unit; The unit for measuring the rate of change of the unit consists of a RAM element whose input is the input of a unit for measuring the rate of change of the angle to which one input of the decoder is connected, the second input of which is connected to the output of the RAM element, and the output is output the unit for measuring the rate of change of the angle; the unit for analyzing accidents consists of logical elements OR, OR NONE and two chains of series-connected logical elements AND, a memory element and a logical element NAND, the outputs of which are the first and the second outputs of the accident analysis unit, the first and second inputs are 64. The third and fourth inputs are the inputs of the first and second AND elements, respectively, the fifth and sixth inputs are the inputs of the OR-NOT element, and the output of the OR element is connected to the second inputs of the AND elements, to the second inputs of the memory elements, output the element OR is NOT connected to the third inputs of the memory elements, the fourth inputs of which are connected to the outputs of the memory elements of the parallel circuit, the first and second inputs of the functional operation block are connected respectively to the outputs of the first and second formers of the rectangle x pulses, the third input of the functional operation unit is connected to the output of the stable frequency generator, and the outputs of the functional operation unit are respectively connected to the three inputs of the comparison unit, the first output of which is connected through the measurement unit of the rate of change of the angle with the first input of the accident analysis unit, to the second input of which the second one is connected the output of the comparison unit, to the third and fourth inputs, respectively, the outputs of the first and second formers of the rectangular pulses, the fifth and sixth inputs are intended to be connected to you odes protections first and second bus sections, and outputs alarm analysis unit intended for connection to the chains disconnecting power switches of the first and second bus sections. Figure 1 shows the structural diagram of the proposed device; figure 2 - diagram of the block analysis of accidents; FIG. 3 is a block diagram of functional operations; in Fig. | - comparison block diagram; Fig. 5 is a block diagram of measuring the rate of change of the angle; Fig. 6 are diagrams for explaining the operation of the block of functional operations: a — three-phase voltage of the backup source; b - three-phase voltage of the main source; (c) a sequence of pulses at the output of the first former of rectangular pulses (, X); g - pulse sequence at the output of the second pulse driver; d - pulse sequence of a logic function; () e - pulse sequence of a logic function X, where V pulse sequence with a frequency of 3S kHz is generated. ,:;,. (block of functional operations from the voltage of the reference frequency generator and synchronized by the leading edge of the pulses of the logic function X ,, X, - ,;, Ж - the pulse sequence of the logic function X 2 (Pierce arrow); 3 - the pulse sequence of the logic function X.-g X (inequality) .S

The device contains two formers 1 and 2 rectangular pulses intended for the formation of rectangular pulses with a duration of 30 eh grades. at the moment of passing through each phase of the first and second phases of the first and second sections through zero. The outputs of the formers 1 and 2 rectangular pulses are connected to the block 3 functional operations. The device also has a 20 kHz stable frequency generator of 100 kHz, the first output of which is connected to the outputs of the formers 1 and 2 rectangular pulses, and the second to the block 3 functional operations. 2S The device is also a unit of 5 comparison, with the three inputs of which is connected a block of 3 functional operations, a block b is measured / the rate of change of block 1 7 analysis: alarms / to the first input of which is under the corner of the block S speed measurement of the angle change, to the second one - to bls. - 5 comparisons, and to the third and fourth quarters - formers 1 and 2 "of rectangular pulses.

The accident analysis unit 7 consists of logical elements OR 8, OR-NOT 9 and two chains of consecutively connected logical elements, jj each of which contains an AND element to 1,11, an element 12 1131g, amti and a logical element I-NOT 1 ( 15) whose outputs are the first /, second outputs of the accident analysis block 7,; j whose first and second inputs are the inputs of the element OR 8, the third and fourth are the inputs of the first and second elements AND 10, 11, respectively; the fifth and sixth inputs are the element inputs, those. OR — NOT 9, with the output of the element OR

8 connected to the second inputs of the elements AND 10, 11, to the second inputs of the elements 12 and 13 of the memory, the output of the element OR NOT

9 is connected to the third inputs of the 12th and 13th memories, the fourth inputs of which are connected to the outputs of 12th and 13th memories of the parallel chain.

B.p:) to 3 functional operations. Consists of two elements NOT 16 and 17; the three elements AND 18, 19 and 20, the element OR 21 and the element OR-NOT 22 and the first input of the second and third elements AND 19, 20 and the first input of the element OR NOT 22, to the second input of the functional operation block 3 is connected via the second element NOT 17, the second input of the second element AND 19, the second passages of the first and third elements And 18, 20 and the second input of the element OR-HP 22, the third input The third element And 20 is connected to the third input of the functional operations block 3, to The outputs of the first and second elements 18,19 and connected element OR 21 whose output is the first output of the block 3 functional operations, and the outputs of the elements OR 22 and the third element AND 20 are respectively the second and third outputs of the block 3 functional operations.

Comparison unit 3 consists of an epHcro trigger distributor 23, the inputs to the circuit; The first and third inputs of the comparison 5 block J are connected to the output of the first ac-d counting element / h, the outputs of which are the first and second inputs of the block 5 compared; -, according to: TE .no, to the second input of the block; j:; the second input of the secondary level; the ticking element of which the trip output is the third Eq. of the comparison unit 5 is connected;

The speed measurement block 6 of change. Hi .ys Ugpa consists of a memory element 25, the input of which is the input of the angle change speed measuring unit 6 to which one input of the decoder 26 is connected, the second input of which is connected to the output of the memory element 25, and the output is the output of block 6 for measuring the rate of change of angle.

The device works in the following way.

In the event of an emergency, for example, in the event of an erroneous disconnection or interruption in the supply input, a remote short circuit, the motor starts running out free of charge Gs7. Lei at the substation. The frequency and magnitude of the voltage of the main power source and the angle between the voltage vectors of the main and backup sources change. The phase voltage of the main and backup power sources is supplied to the corresponding shaper 1 and 2 square pulses, which produce a rectangular pulse with output 30. Formed direct coal pulses go to block 3 of functional operations, which transforms them into the following functions of logic algebra: Conjunction Х Х2 V (fig.be) - third exit - (fig.З); The function of the Pierce arrow X- + X .bzh) - the second exit (Fig. The inequality function X-j + X2 fig.bz) - the first exit (fig.Z). The pulse packet of the sequence X-J X2 V from the third output of the block 3 of functional operations enters the comparison block 5, made in the form of a trigger distributor 23, where each pulse of the packet switches one regular trigger. The switching of the triggers is stopped with the arrival of the pulse sequence K.2 from the block 3 of the functional operations. The signal from the trigger distributor is permitting D11 of the operation of the counting element 2k. As the angle between the vectors of the main and backup sections increases, the duration of the match coincides; Ne I1 "pulses formed by the shapers 1 and 2 of the rectangular pulses, which means that the number of pulses of the sequence Xx, XV, laid down during their coincidence, as well as the number of pulses switchable in block 5 comparison of triggering. The increase in the angle between the voltage vectors of the main and backup power sources to 27 is critical and indicates a failure of the main source. In block 5, compared to the counting element 2k, this angle corresponds to a certain number of triggered triggers. If the pulse packet is a follower 68 of the X-2 V network that arrives at comparison unit 5, switches the corresponding number of triggers, comparison unit 5 (figd) from the counter-comparison element 2k issues an alarm signal on the second exit in block 7 of the accident analysis. The impulse of the sequence X - + X ", coming from the block of 3 functional operations, sets the counting and comparing element 2 of the block 5 of the comparison to the initial state. The device operates in this way if engines with a constant inertia T are at the substation are more than 2.9 s, which means that the speed of ii3 The angle between the voltage vectors of the main and backup power sources during an accident is less than the critical one. In this case, the analysis unit 7 generates a signal for switching from the main to the backup power source according to the signal from the comparison unit 5 when the angle between the voltage vectors of the main and backup power sources exceeds a critical value. If engines with a constant inertia less than 2.9 s are located at the substation, the angle between the voltage vectors of the main and backup power sources does not exceed the critical value. Comparison unit 5 does not give a signal to switch to the accident analysis unit 7, but forms a signal the first output of FIG.), proportional to the duration of the pulse train of the sequence, and outputs it through the first output to the measurement unit 6, the rate of change of the angle, which stores the duration of the packet in element 25, and then compares it in element 26 with the length again, the previous: .Jego package. If the difference in duration exceeds the setpoint, the unit 6 for measuring the rate of change of the angle from the output of the element 26 outputs an alarm signal to the unit 7 for analyzing the alarms on the output. During normal operation of the power sources, the pulses formed by the formers 1 and 2 of the rectangular pulses coincide, the comparison unit 5 and the angle change measurement unit 6 do not emit signals to the alarm unit 7. The accident analysis block 7 communicates with the relay protection, eliminating

false switching npis ko,; o. The company is responsible for the outgoing lines and also determines the emergency power source.

The pulse generated by the square pulse shaper from the voltage of the emergency source j is supplied to the accident analysis unit 7 second, after the pulse generated from the voltage of the intact power source.

The proposed device allows tu to increase the speed and reliability

However, the MTS quality assurance parameter of the variable voltage source uses the angle between the voltage vectors of the main and backup sources and the rate of its change. Tracking the rate of change of the angle allows you to enter a backup power source before the engines with a constant inertia of less than 2 s leave the zone of successful synchronization. -J SdAb ff .rjjeffm

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Claims (1)

DEVICE FOR AUTOMATIC INPUT OF A RESERVE SOURCE OF AC VARIABLE, containing two rectangular pulse shapers and an accident analysis unit, characterized in that, in order to increase its speed and reliability, it is equipped with a functional operation unit, a stable frequency generator, a comparison unit and a unit for measuring the rate of change of the angle of change of angle , the sensors of controlled voltages are connected to the first inputs of the formers of rectangular pulses, and the outputs of a stable frequency generator, unit, are connected to their second inputs. functional operations consists of two elements NOT, three AND elements, an OR element and an OR-NOT element, and the first AND element, the first inputs of the second and third AND elements and the first input of the OR-NOT element are NOT connected to the first input of the block of functional operations through the first element , to the second input of the block of functional operations are connected via the second element NOT the second input of the second element AND, the second inputs of the first and third elements AND and the second input of the element OR NOT, the third input of the third element And is connected to the third input of the block operations, to the outputs of the first and second AND elements, the first OR element is connected, the output of which is the first output of the block of functional operations, and the outputs of the elements are NOT. and the third element And, respectively, are the second and third outputs of the block of functional operations; the comparison block consists of a trigger distributor, the inputs of which are the first and second inputs of the comparison block, respectively, and to the output of the keys, the first input of the calculating and comparing element, the outputs of which they are the first and second outputs of the comparison unit, respectively; the second input of the calculating and comparing element is connected to the second input of the comparison unit, the third input of which is the third input of the comparison unit; the unit for measuring the rate of change of angle consists of an element of RAM, the input of which is the input of the unit for measuring the rate of change of angle, to which one input of the decoder is connected, the second input of which is connected to the output of the element of RAM, and the output is the output of the unit for measuring the rate of change of angle; The alarm analysis block consists of logic elements 9690101 'DS of the items OR, OR NOT, and two chains of sequentially connected logical elements AND, ~ a memory element and a logical element AND NOT, the outputs of which are the first and second outputs of the alarm analysis unit, the first and second inputs which are the inputs of the OR element, the third and fourth are the inputs of the first and second elements AND, respectively, the fifth and sixth inputs are the inputs of the OR-HE element, and the output of the OR element is connected to the second inputs of the AND elements, to the second inputs of the memory elements, the electronic output ment OR-HE is coupled to the third inputs of the memory elements, which fourth inputs coupled to the outputs of memory elements in a parallel chain; the first and second inputs of the block of functional operations are connected respectively to the outputs of the first and second formers of rectangular pulses, the third input of the block of functional operations is connected to the output of the stable frequency generator, and the outputs of the block of functional operations are connected respectively to the three inputs of the comparison block, the first output of which is connected through the measurement block the rate of change of the angle with the first input of the accident analysis unit, to the second input of which the second output of the comparison unit is connected, to the third and fourth inputs - respectively, the outputs of the first and second rectangular pulse shapers, the fifth and sixth inputs are designed to connect to the outputs of the protections of the first and second sections of the buses, and the outputs of the accident analysis unit are designed to connect to the disconnection circuits. power switches of the first and second sections of the buses.