RU2454697C1 - Device for continuous monitoring of multiposition relay switchboard - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: monitoring device contains control switching contact group in switchboard actuating relays, extender of pulse length, 2 AND-NOT and AND-NOT logic elements, trigger of memorisation of event of switchboard incorrect functioning. Direct and inverted outputs of trigger of memorisation of control command through control switching contact group of relay are connected to AND-NOT logic element, so that, upon correct functioning of relay and amplifier, logical unit was at input of AND-NOT logic element not depending on trigger state. Logic zero at input of AND-NOT logic element induces switch of trigger of memorisation of event of switchboard incorrect functioning.

EFFECT: increasing reliability of multiposition relay switchboard operation.

1 dwg

Description

The invention relates to automatic control and monitoring systems, in particular for continuous monitoring of the operation of a multi-position relay switch during operation.

A device for monitoring an electromagnetic relay according to copyright certificate SU No. 1444716, G05B 23/02, containing a key element, elements NOT, elements AND, delay unit, triggers, indicators, key. The device provides control of the functioning of the relay control amplifier and executive relay. The disadvantage of this device is the large number of elements that provide a control function, which reduces the reliability of the control.

The closest in technical essence is the actuator software control device shown in the copyright certificate SU No. 930274, G05B 23/02, containing the address bus, synchronization bus, “Record 0”, “Record 1”, a decoder, a group of triggers for the output register, a group AND elements, switch, AND, OR, NOT elements, delay element and error trigger.

This device provides only control of the correctness of entering information into the selected triggers.

The purpose of the invention is to create a device that continuously monitors the operation of a multi-position relay switch. The proposed control device of the relay switch uses the difference between the switching times of the executive relay of the switch (units of ms) and the trigger for storing the relay control command (less than one microsecond). To organize continuous monitoring of a multi-position relay switch, a separate switching group of contacts in the executive relays is required.

A continuous monitoring device for a multi-position relay switch containing a group of triggers for storing relay control commands, an information line, an information recording bus, a relay switch installation bus, each bus of the information line is connected to input D of the corresponding trigger for storing a relay control command, an information recording bus is connected to the input C of each trigger for storing the relay control command, the bus for setting the relay switch to its initial state It is connected to the input R of each trigger for storing the relay control command, characterized in that it contains the control switching contact group b in the executive relays of the switch, the pulse width extender, logic element 2I-NOT, the trigger for remembering the case of incorrect operation of the switch, the logic element AND-NOT moreover, the inverse output of the trigger for memorizing the relay control command is connected to the input of the relay amplifier and a normally closed contact of the control group of relay contacts b, direct output is a trigger memorizing the relay control command is connected to a normally open contact of the control group of relay contacts b, the output of the relay control amplifier is connected to the first output of the relay control winding, the second output of the relay control winding is connected to a common bus, each switching output of the control group of relay contacts b is connected to a separate logic input AND-NOT element, and the number of inputs of the AND-NOT logical element must correspond to the number of executive relays of the switch covered by the control, recording bus inform The input is connected to the inputs C of the trigger for memorizing the relay control command and the direct input of the pulse extender, the bus for setting the relay switch to the initial state is connected to the inputs R of each trigger for remembering the relay control command, the trigger for remembering the case of incorrect operation of the switch and the inverse input of the pulse width extender, outputs the AND gate AND the pulse width extender are connected to the inputs of the 2AND gate, the output of which is connected to the input S t iggera memorizing event of incorrect operation of the switch, the signal failure of the multi relay switch is removed from the output of the trigger remembering the case of incorrect operation of the switch.

The figure shows a structural diagram of a device for continuous monitoring of a multi-position relay switch.

The figure shows:

1 - trigger for memorizing relay control commands;

2 - relay control amplifier;

3 - relay, with executive a and control b groups of switching contacts;

4 - information highway;

5 - bus for recording information in the trigger;

6 - bus installation relay switch in the initial state;

7 - a pulse width extender;

8 - logical element 2I-NOT;

9 - trigger for memorizing the case of incorrect functioning of the multi-position relay switch;

10 - the logical element AND NOT.

The control device operates as follows. The information on setting the multi-position relay switch to a new state is received through line 4. According to the write signal in the trigger bus 5, the control commands of relay 1 are stored and the executive relay 3 of the switch is transferred to the state corresponding to the received information. Between changes in the state of the switch, with the correct functioning of the amplifier 2 and relay 3, regardless of the state of the trigger for memorizing command 1, logical units are received at the inputs of the AND-NOT 10 logic element. The logical zero signal from the output of the AND-NOT 10 element prevents the logical unit from being written to the memory trigger for the case of incorrect operation of switch 9. If the state of relay 3 does not correspond to the state of the corresponding trigger 1 caused by a failure of relay 3 or amplifier 2, a logic zero from the switching output of the control group of relay 3b will go to the input of the logical element AND-NOT 10 and translate the output of the latter into the state of the logical unit. High logic levels at the inputs of the 2I-NOT 8 element will record a logical unit in the memory trigger for the case of incorrect operation of the switch 9 and issue a failure signal of the multi-position relay switch.

With the authorized change of state of the multi-position relay switch, the signal received via the write bus 5 will start the pulse expander 7. A low logic level at the output of the pulse expander 7 blocks the passage of the switch failure signal through the logic element 2I-NOT 8 for the time of operation of those relays 3 that change their state by recording signal. Obviously, in order to prevent the passage of a false failure signal during the authorized change of state of the multi-position relay switch, it is necessary that the duration of the pulse generated by the pulse expander 7 exceed the maximum switching time of the relay 3 used in the multi-position relay switch.

Similarly, the operation of the elements of the control device according to the signal installation of the relay switch in the initial state.

Changing the state of the memory trigger of the control command of relay 1 in the absence of a recording signal on bus 5, for example, from interference, will cause the logic 3 to appear at the corresponding input of the AND-NOT 10 logic element at the time of switching relay 3 and will write the logical unit to the memory trigger of the case of incorrect functioning switch 9.

The continuous monitoring device of the multi-position relay switch detects the following types of defects of the switch elements:

improper functioning of the relay control amplifier;

defects of the executive relay;

unauthorized change of state (from interference) of a trigger for storing a relay control command;

exceeding the relay switching time (from a defect in the relay or relay control amplifier) beyond the value stored in the pulse expander.

Claims (1)

A continuous monitoring device for a multi-position relay switch containing a group of triggers for storing relay control commands, an information line, an information recording bus, a relay switch installation bus, each bus of the information line is connected to input D of the corresponding trigger for storing a relay control command, an information recording bus is connected to the input From each trigger for storing the relay control command, the bus for setting the relay switch to its initial state It is connected to the input R of each trigger for memorizing the relay control command, characterized in that a control switching contact group of the relay, an expander of pulse duration, logical elements AND-NOT and 2AND-NOT, a trigger for remembering the case of incorrect operation of the switch are introduced into it, and the inverse output of the trigger for remembering relay control command is connected to the input of the relay control amplifier and a normally closed contact of the control contact group of the relay, direct output of the trigger for memorizing the relay control command e is connected to the normally open contact of the control contact group of the relay, the output of the relay control amplifier is connected to the first output of the relay control winding, the second output of the relay control winding is connected to a common bus, each switching output of the control contact group of the relay is connected to a separate input of the AND gate, moreover, the number of inputs of the AND gate must not correspond to the number of switch relays covered by the control, the information recording bus is connected to the input from each trigger of the relay control command and the direct input of the pulse duration extender, the bus for setting the relay switch to its initial state is connected to the inputs R of each trigger for remembering the relay control command, the trigger for remembering the case of incorrect operation of the switch and the inverse input of the pulse duration extender, the outputs of the AND-NOT logical element the pulse width extender is connected to the inputs of the logic element 2I-NOT, the output of which is connected to the input S of the trigger for memorizing the case of incorrect fu ktsionirovaniya switch signal failure multiposition relay switch is removed from the output of a trigger storing case of incorrect operation of the switch.