SU1742931A1 - Device for control over electric installation with protection against emergency operations - Google Patents

Abstract

Usage: in electrical engineering, specifically in control units of electrical installations and devices for their protection. SUMMARY OF THE INVENTION: The control unit comprises Start and Stop buttons with closing contacts and an actuator. To extend its functionality, it is equipped with Start, Stop, Load On, Alarm, AND, OR, and Key schemes. Output of the Start circuit is connected to the second input of the key circuit and one of the inputs of the first And circuit, and the output of the Stop circuit is connected to the third input of the key circuit, the direct output of which is connected to one of the inputs of the second circuit I. The direct output of the on load circuit is connected to the third the input of the second circuit is And, and the inverse - with the third input of the first circuit I. To the inverted output of the alarm circuit, the inputs of which are connected to the outputs of the protection devices, are connected to the second inputs of the circuits AND, the outputs of which are connected through an OR circuit to the actuator m. 1 il. r to

Description

The invention relates to electrical engineering, namely, to relay protection, and can be used to combine various devices for the protection of electrical installations and their control.

The purpose of the invention is to expand the functionality of the device.

The drawing shows a diagram of the proposed device.

The control device consists of the scheme 1 Start and 2 Stop. Both schemes are executed on the timer КР1006 ВИ1, and the circuit 2 with the cell is NOT at the output. In addition, the device has enabled load 3, alarm 4, key 5 and 6, and 7 and 8, and OR 9, executive authority 10,

indicator 11 APP (automatic interrupt start). Circuits 5-8 have three entrances cooTBeTCTieHHo 12th, 15-17, 18-20 and 21-23. The direct output of circuit 2 is connected to terminal 24 Reset 1, and the inverse is connected to terminal 25 Reset O.

The input 12 of circuit 5 is connected to + Un, and the direct output is connected to the input 21 of circuit 8 and terminal 26 Uj ,. The forward output of circuit 3 is connected via a D1C7 circuit with input 23 of circuit 8 and terminal 27 The load is turned on, and the inverse through the fl2C6 circuit is connected to input 20 of circuit 7. The inputs of circuit 3 are 28 current transducer outputs A, B, C, and circuit inputs 4 - Outputs 29 protection devices I-VIII. The output of circuit 1 is connected

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with inputs 13 and 15 of key circuits 5 and bis input 18 of circuit And 7. The direct output of circuit 2 is connected to inputs And and 16 of key circuits 5 and 6. Direct output of circuit k is connected to input 17 of circuit 6, and the inverse is connected to input 19 of the circuit 7 and the input 22 of the circuit 8. The inverse output (circuit 6 is connected to the input of the circuit 11 of the display of the APP. The outputs of the circuits 7 and 8 through the circuit OR 9 are connected to the executive body Y.

Scheme 1 Start is designed to generate a single pulse with a duration equal to the starting cycle of the object being monitored. This duration can be adjusted in the range from seconds to 2.5 minutes, which covers the duration of starting cycles of almost all electric motors. The same impulse is used for organizing the work of the circuits.

Scheme 2 Stop is designed to generate a single pulse with a duration from fractions of a second to 6 seconds, which is used as a reset pulse for electronic devices. Since the initial state for some electronic devices is a single level and zero for others, the circuit 2 has direct and inverse outputs.

Scheme 3 The switched on load is collected according to the OR scheme and outputs a logical unit, if at least one of the current transducers A, B, C receives a load signal at its input. The direct and inverse signals from the output of circuit 3 are used to organize the operation of the device.

Circuit k Alarms are designed to combine the outputs of devices protected by a common output. The number of inputs to the b circuit is determined by the number of protection devices. The direct and inverse logic signals from the output of circuit b are used to organize the operation of the control unit.

In the initial state, the capacitor C1 is shunted through the timer KR10068I1 of circuit 1, at the second input of which the voltage is close to + ip. When the SB button is pressed, the start to the second input is applied to zero, the timer starts and produces a single pulse, the duration of which is defined by the expression 1 JR2C1 and dim. is within the previously specified limits

R2 resistor. This single impulse must be equal to or slightly longer than the starting cycle.

electric motor at rated load.

At the moment the power is turned on, the second input of the Stop circuit timer is zero due to the integrating

R3C3 chains. The timer starts and generates a single impulse reset, the duration of which is equal to Oua1,. This impulse sets circuits 5 and 6 to the initial state. If in the scheme

5, triggers, counters, or other elements having the initial state reset inputs are used, this pulse is used for them.

0 If the load is turned on., Then when the SB2 button is pressed, the Stop Timer generates a reset pulse, which sets circuits 5 and 6 and the protection devices to the initial state and. the load is turned off.

The control device operates as follows.

When the power is turned on through the integrating chain R3C3, the timer DD2 is started, which generates a pulse Reset of the set duration. This pulse arrives at input 14 of circuit 5 and input 16 of circuit 6, as well as at elements of I-VIII protection devices that require preliminary installation in the initial state. After that, the control unit together with the protection devices is ready for operation.

When you press the SB1 button, the Start of the circuit produces a pulse, which is fed to the input 13 of the circuit 5, the input 15 of the circuit 6 and the input 18 of the circuit 7. At the input 19 of the circuit 7 there is a logical unit from the inverse output of the circuit 4,

5a at input 20 is the logical unit from the inverse output of circuit 3. When the signals at all inputs of circuit 7 coincide, a logical unit appears at its output, which through circuit 9 goes to the actuator 10, which includes the load.

Since, at the input 12 of the circuit 5, the voltage is + Un, then under the action of the start-up pulse-f the circuit overturns on

5, a logical unit appears at its direct output, which is fed to terminal 26 Un and to input 21 of circuit 8. At input 22 of this circuit, there is a logical

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unit is from the inverse output of circuit k, and input 23 is the logical zero from the direct output of circuit 3. The output of circuit 8 is also zero. At the input O 9 of the circuit 7 there is a logical unit from the inverse output of the circuit k, and at the input 20 there is a logical unit from the inverse output of the circuit 3. The circuit 7 opens and the logical unit from its output goes through the circuit 9 to the actuator 10, which includes the load.

As soon as the load is turned on, a signal appears at the outputs of converters A, B, C, or at least one of them, which triggers circuit 3. A logical unit is removed from input 20 of circuit 7 with a delay of 20-30 ms due to capacitor Sat and the input unit 23 of circuit 8 is the logical unit from the direct output of circuit 3 without delay. As a result, circuit 8 opens somewhat earlier than circuit 7 closes and blocks the load in the on state.

If at the moment of the Pulse Start action, an alarm signal is received from the I-VIII protection devices - the circuit k operates and the logical unit from its direct output goes to the input 17 of the circuit 6. The latter operates and through the circuit 11 generates an AFS signal. The logical unit is removed from the inverse output of the circuit k, which is fed to the input 22 of the circuit 8. It closes and removes the logical unit from the executive body. The load is disconnected.

At the end of the pulse action, the control unit goes into standby mode. The impulse is removed from the start of the input 15 of the circuit 6 and the APP signal passage circuit is blocked. The start pulse is removed from input 18 of circuit 7, stopping the start mode. The load is turned on by the signal from circuit 8. The standby mode is maintained until you click the Stop button or until an alarm occurs.

If an alarm is received at the input of the circuit h, then a logical unit is removed from its inverse output, circuit 8 closes, the actuator shuts off, and the load is disconnected.

If the load is switched off by the Relay button, the circuit 5 will turn off;

is rotated to its original state by a pulse Stop, which is fed to input 1. A logical unit is removed from the input 21 of the circuit 8, the circuit 8 is closed and the logical unit is removed from the actuator, which disconnects the load.

A device for controlling an electrical installation with emergency protection can be used to protect both AC and DC circuits, both single phase and multiphase, both single-channel and 15 multi-channel (determined by the number of connected protection devices) both low and high voltage without changing the circuit.

20

formula of invention

A device for controlling an electrical installation with emergency-powered operation, comprising start-up circuits,

Stop, the first key scheme, the first And circuit, the output of which is connected to the first input of the IlN circuit, to the output of which the actuator input is connected, characterized in that, in order to expand its functionality, an additional circuit is included that has inputs for connecting to the corresponding phases of the electrical installation, the alarm signal circuit, whose inputs are intended to be connected to the corresponding protection circuits, the second key circuit, the second AND circuit, the output of which is connected to the second at the input of the OR circuit, wherein the direct output of the first key circuit is connected to the first input of the second circuit AND, the second and third inputs of which are connected respectively to the inverse output of the alarm circuit and the direct output of the load enable circuit, the output of the Start circuit is connected to the corresponding Bxof. jMH first and second key schemes and with the first input of the first

the And circuit, the second and third inputs of which are connected respectively to the second input of the second And circuit and the inverse output of the load switching circuit, the output of the Stop circuit is connected to another

the input of the first key circuit and the second input of the second key circuit, the third input of which is connected to the forward output of the alarm circuit.

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Claims (1)

Usage: in electrical engineering, specifically in the control units of electrical installations and devices for their protection. The inventive control unit contains the button "Start" and "Stop" with closing contacts and the executive body .. For expansion