SU257584A1 - - Google Patents

Description

DEVICE FOR PROTECTION

The known devices for protection of automatic setups with duplication of channels, containing in each K1A1N1ale power supply sources, logic circuits, an output amplifier and sensors of aiBa-rim siping, are uneconomical, difficult to operate and little reliable.

The proposed CTIBO device differs from that known in that each channel is equipped with a trigger with a delay element in its prohibiting reverse C1B3131. The trigger input through the differentiating chains is connected to the inputs of the logic circuits, and the output through the truncating electrode of a power thyristor to the output amplifier power circuit.

This increases the propriety of protection.

FIG. 1 shows a functional diagram of a logic device for automatic protection; chga of fig. 2 - time diagrams of voltages, currents and amerwits in different circuits of the control unit.

The device operates according to the signals of sensors / a / emergency parameters. It has two (/ and I) identical channels of lobe control and node a; automatic control and 1 signaling; and.

five; the element "delay 6; differentiating / C-nepocheki, where: C - capacitor of the terminal capacity; R is the resistor (: bit voltage); D - semiconductor diode; 7 - controlled thyristor; electric actuator 8 -executive mechanisms.

The control signaling node consists of an element in 5 comparisons; specifying reinepaTora 10; distributors 7 /: and 12; thyristors

/, n 14; la; mp / 5 alarms about failing; block J6 power and thyristor / 7.

FIG. 2, the following oboziachs 1i are introduced: a is the curve of the power pin-block 4 of the power supply; 6 - output current emulsions rasi-distributor //

(the distributor has a similar output / 2); c - curves of the amperages for reading (negative 31 values) and preparation (positive values) of the cores of the elements of comparison 9 in the absence of failures in the channels; d is the voltage curve of the power supply unit 6; e — ampere turns of clock readings of the cores of comparison elements 9; (i) amperages for preparing the cores after reading them with a 1M clock pulse; and in the absence of channel failures; g - the same, but in the presence of failures. AUTOMATIC INSTALLATIONS

A logic device is an electrical device, designed for "by pr and s, and YOU; yes) by dc signals of a direct current with a relay characteristic.

Depending on the state of the protection object, the device is either in idle mode (n) and 1аnvar iy1n; s: x signals (long mode), or in function mode (short-term mode).

The coils of electric drives (Optional MexaiHHSiMOB in standby mode are de-energized.

In fuction mode: the coils of the actuators of the actuators receive signals from the logic unit for a time sufficient to trigger them, after which the actuators turn on (Locking and the coils de-energize).

A logical device diagram. Presented in FIG. 1. A device for the purpose of increasing the reliability of the cpp is reserved by duplicating channels. Each channel contains logical values 2, output amplifiers 3 and power supply unit 4, as well as an auxiliary switch node, designed to increase reliability} Failure failure type of "false positives."

The switching unit 1B consists of differentiating RC circuits according to the number of inputs of the J component of the mi, the element of the 6 t linkage, and the controlled thyristor 7 IB of the electric drive power supply circuit of the 8 actuators. The sequence is represented by direct current loads.

The channels are connected by one-of-a-kind. Inputs and outputs of the same name: in the nerve case - sensor I | mi I, in the second - electrically conduits 8 executive and management systems.

In order to detect equipment failures, the logic device contains a monitoring and signaling unit consisting of 9 elements of the output device for the number of output 101, the master oscillator 10, the I and / - distributors, 13 controllable thyristors, 13 and power supply 16.

Logic circuits are built in accordance with the above algorithm - based on single-ended or multi-tact functional elements (cells) of any type, easily interconnected with yes) signals of signal currents.

So, for example, ferrite-diode, ferrite-transistor and transistor complexes of logic elements, electrolytic relays, etc. can be applied. The choice of whether or iiiHoro complex is determined in K1 each specific case by the logic device.

The type of output amplifier is also chosen in each particular case, depending on the requirements and xapiaiKTepa and load.

The connection and control nodes, which increase the reliability of a logical device, require special discharging.

The Turn-on node is triggered only during periods of the Turnings to the logic device, while at other times it is in standby mode.

The control node carries out continuous automatic control of failures that may occur in the hardware of the logic device during the periods between development.

The operation of the switch-on node was based on the principle of a one-shot vibrator, producing a short signal when the signal from its 5 output changes. The role of a one-shot is performed by differentiating RC-chains connected to the inputs of a logic device. The outputs of the RC chains are combined in an "OR at the input of the memory 5 memory.

0 Last (in tandem with the element "delay 61" are intended to obtain the endurance of a time sufficient for the operation of: actuators. Element 5 pas (the machine acts on a controlled thyristor 7 in the power supply circuit 5 of the electric motor: the actuator).

Differentiating RC chains operate on the principle of capacitor charge. The role of the LHoro resistance is performed in the input fconpo of the trigger.

Diode E Prevents the capacitor from discharging to the input source.

The high-impedance resistor R, the shunt capacitor C, acts as a discharge resistance. In those cases when a direct-current signal is received from the sensor with a negligible coefficient O | M n), there is no need for a DI 1 and a resistor R to disappear.

0 Parameters RC circuit (selected in each specific case at the rate of 1 Reliable start element 5.

Elements 5 and 5 can be applied from a number of the same elements on which the logic circuits of this device are built.

The operation of the power up node is as follows.

In case of normal operation of the protected object, there are no alarm signals in the inputs of the logic device, differential circuit capacitors are discharged, element 5 is in the IB state “O, there is no current at its output and the controlled thyristor in the power supply circuit is closed.

5 When the new emergency signal has an emergency signal (having a relay characteristic), the corresponding capacitor is charged, the current flowing through the input circuit of element 5 during the period of the charge, the condensate: op: a, translates the element

 5 to state “I. The output of element 5, the signal of an oTKipbisiaeT, is an equiprable thyristor 7, which connects the electromagnets of the actuating mechanisms to the power supply unit 4. At the same time, the alarm signal causes the corners to be consistent (a.mpwn itog in fig., /), Since for its duration it is much longer than the duration of its read clock; mplse. Third distributor output power terminal // tkry.vaet thyristor 7 in the second., Nale and tiistar In the input windings of the installation in O cores of ele. Eitov 9. The cores are counted (set in “O) thin, flowing through the thyristors by the same electric drives , as the output amplifiers of the neural to the ai al a. A subsequent reading of the hearts of H1IkI with such an amusement does not cause change: neither. apr aa n aa n a n ate about a serdech (v, ig} 1al is absent in the output windings, tIstors in the alarm circuits are closed. The llamas are quenched. For the same outputs of the channels, and the output amplifiers are not The logic from the logic, the preparation current (an impulse of polarization polarity in Fig. 2, is absent during the subsequent MF, and the output of Element 9), the current at its output (Fig. 2) ore is detected; that is. In both Cases x for chains with both closed and open amplifiers, one by one: the digital outputs are the current in the lamp circuit are signaling or missing or absent It is such that "it illuminates them. Similarly, the circuit works when checking for the absence of spurious signals on the outputs of the second channel and the failures of the type of the lepBoro channel. When the thyristors are opened 7 times, the output amplifiers of the first and then iToporo channels and the coils of the current groove current , but the actuators do not work due to their investment 1: and the short duration of the impulse. Pr; and the emergence of false signals, the load at the output of the first channel or the failures of the “non-acrobat iBo iBo” failures (the second, after Twi third output pulse 11 raspre1elitel thyristor 7 and the second channel 13 iristor serdech nicks elements 9 through podgotavlivayuts false arabotaeshie weekend preamplifier first channel are read out or not through the second channel amplifiers. The cores, which were still prepared during the subsequent reading of them with clock pulses, are again prepared by the current flowing from the black 16 through the corresponding lamps / 5 signaling signals, thyristors in the signal circuits, and output windings of the elements 9 (amper-turns gshd in Fig. 2, g) Signaling lamps 15, corresponding to a spurious output from the first channel, are hot before starting the distributor 7.2, the first output of which is set by all the cores to “O, the lights go out and light up again after starting the distributor //”. An alarm indicates that non-equivalence in one PP channels. The presence of spurious signals from the second canal is determined after the start of the 12 ppt distributor. Its spgnals after the installation of the core cores in "O open the thyristors 7, 13 and 14 in a different sequence: first the tirpstor 7 in the second channel and the thyristor 14 are opened, and then thyristor 7 in the first channel and thyristor 13. Faults in the channels are signaled by blinking, corresponding to the faulty lamp / 5 outputs. Thus, on one ferro-bottom element for each pair of outputs, the state of the same-named outputs of different channels is compared and the signaling is controlled for each OUTPUT. The subject of the invention is a device for the protection of automatic devices: new channels with duplication of channels, containing IB for each channel of the power supply, logical circuits, output cables and alarm sensors, characterized by that. that, in order to increase the reliability of protection, each channel is equipped with a trigger with a delay element in its prohibitive feedback, input: Which through differentiating circuits is connected to the inputs of logic circuits, and the output through the control electrode of the SYLOVOG. About the thyristor - to the power circuit OILIT exit;

which issue sipnals of management 1 to executive mechanisms.

An element of element 5 is an element of element 6, which counts the prescribed time delay sufficient to work out xpolite-mehai-isms, after which the element 5 returns to its outcome. The signal "a-output element 5 disappears, element 6 returns IB initial state, thyristor 7 closes, disconnecting the load from power supply 4. Thus, the logical device is again not in standby mode.

Thus, the 1M, switching-on node works every time the logical device is accessed.

In the case when, during the testing period, several consecutive emergency signals occur at the inputs of the logic device B1a, followed by small intervals of small alarm signals, the period of testing is correspondingly equal to 1-1. For this, the RC chains OUTCOMES are associated with the chain of a trust in “About element 6. Therefore, each emergency signal, 1 return to element 5, simultaneously returns-to zero state element 6, which starts counting the time delay from the beginning 1a. The duration of the element 5 in the state "1" increases with the table, with, how many are required for the operation of all; the operating mechanisms in this emergency situation.

Along with the above described node, the inclusion node solves another problem. Often, in devices that work on mechanical mechanisms with | S1MO | BLOCKING, the control signals are removed from the actuators in time, depending on the output time, are specially timed for this purpose individually for each output of the time relay. In systems with a large number of outputs, a significant number is accumulated in such BpeiMeHii relays. But since the time that the master node performs on the day, the same function of removing control signals from the actuators, the individual time relays can be excluded. The time delay of the element "delay" time of the master node is chosen equal to the maximum shutter speed of the individual dual time relays.

Automatic control 1И1СираБ. logical device is carried out by periodically polling the state of all the outputs simultaneously of one, first, la, then other channels, and the similar outputs iC, giving a fault signal when they are not normal.

The ganerragor 10 in the control node is a paranapachep for the periodic alternate launch of open-loop distributors 1J and} 2. The output signals of the distributors in a certain sequence will act on the thyristors 7 in the power supply circuits of the actuators of the actuators 1 and the thyristors 13, 14 and 17 in the control circuits. Switches of thyristors 7, 13, 14 F 17 1 cause the appearance in the input windings of ferrodiode elements 9, which are intended for comparing the state of like outputs of different channels.

A master geerzgor 10 represents a mains frequency divider on ferrodiode triggered shift registers.

It (Pulses from the master oscillator alternately arrive at the inputs of ferrodiode open distributors // m 12. During the operation of the distributor 11 is carried out; Control the absence of spurious signals at the outputs of the first channel and failures like "failure of the second channel, and vice versa. During operation the distributor 12 is carried out

control of the absence of spurious signals at the outputs of the second channel and the failure of the first channel 1.

Consider the operation of the control node, when 1Pr1C1 verifies the absence of false signals on

the outputs of the first channel and failures of the type “failure of the second channel.

During the period (Between working off for some output amplifiers of the 3 same channel outputs, the signals from the trays arrive, and Hia

the rest do not. In this case, the thyristors 7 of both channels, and that; also, the thyristors 13, 14 and 17 are closed before each start of the operation of the distributors // and 12, the coils of the electric drives 8 are de-energized and the signal

75 bulbs not hot t.

The principle of operation of the control assembly is explained in FIG. 2, where the time diagrams of a-g voltage and current impulses in different chains of the control node are given.

The first output pulse i of the distributor // opens the thyristor 17 and a current pulse passes through the windings of the installation in the "On the cores of the elements 9" (ampwiths iwc, and a | Fig. 2, c) and the cores are installed:

state 1e (in “O).

The pulse of the clock readout (ampeg turns gS in Fig. 2, f) does not cause a change in the magnetic state of the cores of the elements 9.

The second output impulse distribution: ITAL // opens the thyristor 7 IB nepisoM channel and the thyristor 14 in the circuits of the preparation windings (installation in "1) of the cores of the elements 9.

From the power supply unit 4 through the thyristors 7 and 14 along the windings of the preparation, corresponding to the included output amplifiers of the first channel, the current of setting the cores will flow to "1 (preparation ampere turns mg in Fig. 2c).

During the subsequent reading of the cores by the clock pulse (ampere turns iw in FIG.

2, e) in the output windings of the ferro-diode elements 9, previously prepared, appears

3.d. c., by the action of which the corresponding thyristors are switched in the signal circuits

R

 2