SU760308A1 - Starting unit for automatics of standby power supply - Google Patents

Description

The invention relates to start-up bodies of emergency control automation of power systems that transfer load from a working source to a backup source when power is lost.

Known devices that perform the function of identifying the loss of power to consumers without a motor load, in the presence of engines, control backup power and the level of residual voltage on the quenched section £ ΐ]. With bilateral AVR, the device contains up to eight independent measuring elements, which significantly complicates its information part. · 15

The closest solution to the technical problem is the automatic start-up unit for bilateral ABP, which is implemented. identifying the loss of power to consumers without motor load and monitoring the backup voltage.

It contains the logic “Inequality”, the input of each channel of which through the pulse shaper is connected to two linear voltages of its power source. The outputs of the ambiguity circuit directly and through an element of time are connected to the inputs of the AND finite logic circuits acting on the blocks.

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disconnecting switches of working inputs £ 2].

The information part of the module contains only two pulse shapers. However, the construction of the actual shaper is difficult because of the need to control both half-waves of several linear voltages. The possibilities of the module are limited, since 10 it does not detect a loss of power to the motors, does not produce in this connection an accelerated separation of the working input and field quenching, does not control the level of residual voltage on the section to eliminate asynchronous power supply.

The aim of the invention is to enhance the functionality.

This goal is achieved by the fact that the start-up automation unit of the “backup power supply”, containing the logic “Inequality”, whose inputs are intended to be connected via voltage formers of redundant power supplies, and the final logic circuits AND, whose outputs are connected to the shutdown units working input switches, one input with 30 time element output, another input

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760308

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with the first input of the element OR, three logical schemes were introduced AND with control of the order of receipt of signals, “Exclusive OR”, AND, “Ban”, elements with a given duration you ..... Signal '"signal, signaling unit

and a switch-on unit of the backup switch, with the inputs of the first circuit And with the control of the signal arrival order connected to the first channel of the Inequality scheme, the inputs of the second circuit And with the monitoring of the signal arrival order - with the second channel of the Neglarity scheme, the outputs of the Inequality circuit through the first elements with a given output signal duration They are connected to the inputs of the third circuit AND with control of the signal arrival order, the second input of the "OR" element, the first input of the "Exclusive OR" circuit, the second input of the end with And it outputs the first and second circuits and to control the order of receipt of signals via the second elements of a predetermined duration of the output signal are connected to second inputs of circuit "exclusive OR", - the output of which is connected to the switching unit reserving switch element vhodom- ^

And the prohibiting input of the "Prohibition" element, the output of which is connected to the alarm unit, the second inputs of the AND element and the "Prohibition" element are connected to the output of the OR element, the outputs of the third circuit And with the control of the signal flow order - with the inputs of the corresponding shutdown units of the operating inputs switch, and pulse shapers with a duration up to half a period were used as pulse formers.

FIG. 1 is a block diagram of the proposed device} in FIG. 2 signals at the control points of the device with different modes of operation of power sources.

The device contains the logic "Inequality", 1, which includes 2.3 inverters and And 4.5 elements. The inputs of the circuit 1 through the pulse shapers with a duration of up to half a period of 6.7 connected to the reserved voltage. First logical

And with the control of the order of receipt of signals 8 includes a trigger 9, the element And 10 and the element And 4, which is part of the first channel of the circuit 1. The second logic circuit And with the control of the order of receipt of signals 11 includes a trigger 12 _} element And 13 and element 5, part of the second channel of scheme 1, the outputs of the elements 10,13 are connected elements with a given duration of the output signal 14,15, delaying the signal, disappear. Elements with a given output signal duration of 16.17 are connected to the output of elements 4.5, which delay the appearance of the signal (0.5-1 ms) and the delay of the disappearance signal. The motor overshoot detection circuit is formed by a logic circuit AND with control of the order of receipt of signals 18, including trigger 19, element 20 and element 21, the inputs of circuit 18 are connected to elements 16.17, and the outputs to blocks 22.23 of the operation switches off . The power loss detection circuit without motors is represented by the element OR 24, the time element 25, the final logic circuitry And 26,27, with the outputs of circuits 26, 27 connected to blocks 22,23, and the inputs to the outputs of elements 16,17 and 25. Blocking circuits composed of a logic circuit ^and Exclusive OR 28 and element 29, and the inputs of circuit 28 are connected to elements 14,15,16,17 and to block 30, which prohibits the ATS when the automatic voltage circuit is disconnected, and element 29 is inserted between the element OR 24 and an element of time 25. The alarm signaling circuits contain an element The "Ban" ent 31 and the signaling unit 32, and the prohibiting input of the element "Ban" is connected to the output of the circuit 28, allowing - to the output of the element OR 24, and the output - to the input of the signaling unit. which is connected to the output of the logic circuit 28, eliminates the non-synchronous switching on of the motors at a significant level of residual EMF in the section.

In the normal mode (figure 2, a) voltage and u2. are close in phase and amplitude, the signals at the output of the formers 6.7 and the inverters 2.3 do not coincide in time. Signals at the output of elements 14-17 are absent, the detuning from the permissible variation of the parameters is performed by a delay to act (0.5-1 ms) of elements 16.17. In case of loss of power of the first section and the absence of engines

= 0 (FIG. 2, b) at the input of the element AND 4 signals' = 1 periodically

coincide, and the appearance of the signal x, = 1 is ahead of the appearance of the signal x $ = 1. Due to this, trigger 9 sends a signal "1" to the third input of element 4, all three signals at the inputs of element And 4 periodically become equal to "1", element 16 converts the periodic output signal of an AND 4 element into a continuous y '= 1. Signals γ ₁ , y ₉ , y ₄ = 0. Next, the OR 24 element allows the inclusion of the And 29 and Ban elements 31. Because there is a signal only at one input of the circuit "Exclusive OR? 28, the latter issues a command to turn on the element 29, prohibits including 760308

element 31 and allows the operation of the section switch (through block 33). For two input signals, element 29 starts time 25, after a predetermined time delay the circuit breaker will turn on and 26 and act on the opening block of the first section 22. Block off the input and the switch from circuit 28 will turn on the section switch. The alarm unit 32 does not work, because The signal from the circuit 28 is present at the prohibiting input of the element 31. Logic circuit 18 does not work, since its inputs have only one signal with _y = 1.

The overshoot of the motor load causes in the initial period the lag of the residual emf in phase (figure 2, a). In this case there is a coincidence of the signals xd, in the circuit 8 and

signals x, x. in scheme 11. Since at the time of coincidence the signal x ^ = 1 is ahead of the signal _xg = 1, then the flip-flop 9 sends a signal "1" to the third input of the AND 4 element, which forms a continuous signal _yj =: 1. Since in the second channel at the time of coincidence-. signal x ₄ = 1 ahead of the signal * _g = 1, then the trigger 12 sends a signal. "1" at the third input of the element And 13, which forms a continuous signal γ _Λ = 1 .. Values, Uz = 0. The number of signals at the inputs of the circuit 28 is not equal to one, so the output of the last signal is missing (equal to zero) ... Turn on block 33 is blocked, the alarm unit 32 is started on the element "Prohibition" 31 there is an enable signal from the element OR'24 and there is no inhibit signal from circuit 28. The inclusion of time element 25 is blocked - there is no permit signal from circuit 28 at one input of the AND element 29. 18 does not work - signal y ^ = 0. If the duration is This mode will exceed the one specified in the alarm unit, this indicates a phase failure of the trg'.formator of the voltage, AVR does not work, a signal is sent to the central alarm system. In the normal run-up mode of the engines, the moment of the antiphase of the stresses and ^ and 11 ^ comes next (figure 2, d). In this case, the moment of coincidence of signals x _n, x1 order of their formation is reversed (x ₌ 1 appears before x 4 = O. The trigger pulse 12 delivers a "1" to the third input of the AND element 5 than the formed continuous signal y = 1 The signal y ^ _ = 1 is held for some time by element 16. Signals y4, _{Y (} , = 0, the number of signals at the inputs of circuit 28 is not equal to one, all nodes of the signaling, switching on and voltage starting circuits retain their previous state. To inputs schemes And with control of the order of receipt of signals 18 now both signals ala γ _α, Y ₃ "1.prichem signal y ₌ 1 has been filed before. Consequently, the flip-flop 19 supplies a signal" 1 "to the third input of AND gate 20, the latter permits the actuation block 22, disconnection of the first input section without delay and damping excitation of the running out engines. As the magnitude of the residual EMF decreases, there comes a moment on the sections corresponding to Fig. 2.6, when regardless of the change in the phase difference of voltages ^{and and} q the value

below the threshold of the pulse shaper b. Since such a residual voltage value allows the power to be applied to the running engines, a sectional switch is enabled (signal y ₅ "1, signals y ₍ , y ₃ , y ₄ = 0) _? Circuit 28 enables the operation of block 33. At the same time, the enabling signal is removed from the alarm unit the command given periodically during the overrun process. In the event of a failure of the second section, a signal appears first, y ^ = "T, then y = 1, the second input is disconnected. The device returns to its original state after the restoration of the normal power supply and, in the absence of both voltages, the trigger body does not work. The device does not respond to system-wide frequency reduction.

In addition to the inherent functions of a well-known module: detecting the absence of an operating voltage, monitoring backup power supply, the proposed AVR start-up unit detects the loss of power to the motor load, accelerates disconnection of the input with the implementation of measures for motor resynchronization, monitors the level of the residual voltage of the voltage transformer despite at a sufficient level of induced emf. No known device has the latest quality. Therefore, the proposed body has more functionality. At the same time, the information part of the body is simpler, since a half-wave rectifier connected to one line voltage is used. Reducing the number of independent measuring elements with a relatively simple logical part and wide possibilities gives an economic effect in comparison with known objects. Execution of the body, in the form of a large integrated circuit (LSI) optoelectronic input and output. With chains gives a significant increase in reliability (minimum of external connections is 760308

lowering) and reducing the size. The constituent elements of the body are known; no additional research work is required for its industrial application. ·

Claims (1)

claim 5 Start-up automatic input backup power supply cell containing the "Equality" logic circuit, the inputs of which are intended to be connected via pulse shapers to 10 voltages of redundant power supplies, and final AND logic circuits whose outputs are connected to the shutdown blocks of the operating inputs breakers ,, one 'input - with the output of the time element, another input - with the first input of the OR element, characterized in that, in order to expand the functionality, three AND 20 logic circuits with order control are introduced into it and the arrival of signals, “Exclusive OR”, AND, “Prohibition” are four elements with a given duration of the output signal, the alarm unit and the switch-on unit of the backup switch, and the inputs of the first * ·> circuit AND with control of the order of receipt of signals are connected to the first channel of the circuit "Equality", the inputs of the second circuit And with the control of the order of receipt of signals · -co '30 second channel of the circuit "-Equilibrium" outputs of the circuit "Equality" through the first elements with a given duration of the output signal connected to the inputs of the third c emy And with control of the order of receipt of signals; the second input of the OR element, the first input of the Exclusive OR circuit, the second input of the AND terminal circuits, the outputs of the first and second circuits ’AND control the signal flow through the second elements with a given output signal duration connected to the second logic inputs. The exclusive OR circuit, the output of which is connected to the reluctance switch on unit, the AND input and the inhibit input of the Ban element, whose output is connected to the alarm unit; the second inputs of the AND element and the Ban element are connected to the output of the OR element, the outputs of the third circuit And with the control of the order of the arrival of signals with the inputs of the corresponding shutdown blocks of the circuit breakers of the working inputs, and as a pulse formers used pulse formers with a duration up to half a period.