KR20040037811A - Safety Relay - Google Patents

Abstract

PURPOSE: A self test type safety relay is provided to further increase the operational reliability of the relay by operating a main relay switch in the relay with synchronization of two micro processor. CONSTITUTION: A self test type safety relay includes an AC/DC converting block(110), a first relay(120), a second relay(130), a detection circuit block(140), a first microprocessor(150), a second microprocessor(160), a display device(170), a first AND gate(180) and a second AND gate(190). The AC/DC converting block(110) supplies the power to the circuits of the relay after an alternative current induced from the coil is converted into a direct current. The first relay(120) is switched by a second magnetic coil and the second relay(130) is connected between the output terminal of the AC/DC converting block(110) and the second magnetic coil. The detection circuit block(140) detects the error of the operation or the circuit design of the relay. The first microprocessor(150) outputs the display corresponding to the operational error and the control signal. The second microprocessor(160) outputs the display corresponding to the checked operational status and the control signal. The display device(170) displays the status of the failure in response to the determination result for the design and the operational states of the first and the second microprocessors(150,160). The first AND gate(180) controls the operation of the second magnet coil. And, the second AND gate(190) controls the switching of the second relay device(120).

Description

Self-diagnostic type safety relay {Safety Relay}

The present invention relates to a relay, and in particular, two microprocessors are synchronized with each other to control the driving of a main relay switch embedded in the relay, and cross-check and control the state and input power of the relay to perform a stable operation. The present invention relates to a self-diagnostic type safety relay.

In general, a lot of safety accidents occur in the power system, such as damage caused by natural disasters such as lightning strikes, short circuit accidents caused by currents such as magpies, low voltage generation due to overload of the system, damage to equipment, and leakage of loads such as electric motors. Many safety accidents are inherent, such as ground faults.

If these accidents are left unattended, the loss of human and material resources becomes very serious. Therefore, by adopting system protection devices such as relays, the accident system can be quickly separated from other normal systems to prevent the spread of accidents to other systems. At the same time, measures are taken to prevent the spread of accidents in the accident system.

FIG. 1 is a diagram illustrating a conventional relay and a monitoring device thereof, as shown in FIG. 1, a circuit breaker 1 for selectively supplying power to a trunk branch branched from a bus and applying power to a load, and the circuit breaker 1. An operation and control unit for receiving the current of the current flowing through the applied voltage and the applied voltage to the secondary side of the instrument transformer, and outputting a control signal after a predetermined operation corresponding to the output of the instrument transformer 2; 3), a circuit breaker driving relay (RLY1) 5 for controlling the driving of the circuit breaker 1 by receiving the amplified output signal of the operation and the controller 3, and a photo operated by an AC power source AC. A coupler (PC1) 6 and an analog-to-digital converter 7 for receiving and converting an output signal according to the operation of the photocoupler 6 and inputting a signal to the operation and control unit 3.

The state monitoring of the cutoff circuit is performed by alternating current (AC) via the breaker trip coil (1a) to allow the current to flow through the photocoupler (6) and to be operated normally as input to the operation and control unit (3). Can be monitored.

At this time, the resistance (R) is set so that the circuit breaker trip coil (1a) is lower than the current value that can operate, so that the circuit breaker trip coil (1a) does not operate, and the circuit and circuit of the operation and control unit (3) When disconnection or short circuit of the circuit breaker trip coil 1a or abnormality of the AC power source AC occurs, the photocoupler 6 is not driven and the operation and control unit 3 does not receive a signal. Therefore, the calculation and control unit 3 can monitor the abnormality of the blocking circuit.

On the other hand, when overpower is applied, the detected signal of the power detector 2 excites the coil of the circuit breaker driving relay RLY1 with the output current controlled and controlled by the calculation and control unit 3.

As a result, the switch (contact A) of the circuit breaker driving relay RLY1 is short-circuited, and the circuit breaker trip coil 4 is operated to prevent the circuit breaker 1 from being opened and the overpower applied to the load.

However, in the prior art operating as described above, since the circuit breaker driving relay operates only in the event of a system accident, the contact (contact point A) of the relay made of a conductor is continuously exposed to air and corrosion occurs when it is old, and several times of interruption are caused. Even in the operation, the relay contact may be burned out by the current flowing in the breaking operation.

In addition, the relay may not operate in case of disconnection or short circuit of the circuit breaker driving relay coil, and the circuit breaker may be driven even if the circuit for driving the circuit breaker driving relay is disconnected or shorted due to an abnormal occurrence of the relay internal circuit. There is no way to monitor for abnormalities until you see them. That is, when electricity is applied to the coil of the circuit breaker driving relay to check the circuit breaker driving relay, there is a problem that the circuit breaker operates at the same time.

In addition, conventional relays have been proposed to implement a driving circuit as a transistor instead of a microprocessor or use a transistor as an output method instead of a relay. When the driving circuit is a transistor, a check for incorrect wiring of the relay is performed. In addition, there was a possibility of malfunction due to a simple circuit, and there was a problem that the output method could be used only at low voltage when using a transistor instead of a relay.

Accordingly, an object of the present invention is to self-diagnose the operation of the main relay switch embedded in the relay by controlling the state of the relay and the input power, etc. while the two microprocessors are synchronized with each other to perform a stable operation To provide a safety relay.

In addition, another object of the present invention is to provide a self-diagnosis relay having a high operation reliability of the relay by enabling the self-diagnosis by adding the function of the mis-wiring of the relay, the cross-check of the input and output and the failure alarm function.

1 is an exemplary view showing a conventional relay and its monitoring device,

2 is a diagram showing a relay and a peripheral circuit applied to the present invention,

3 is an internal block diagram showing a self-diagnosis relay according to an embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

10: Load 30: Breaker

70: self-detection means 100: relay

110: AC / DC converter 120: first relay unit

130: second relay means 140: detection circuit unit

150: first microprocessor 160: second microprocessor

170: display means 180: first end gate

190: second and gate P1 to P4: first port

R1 to R2: second port Y1: third port

Technical means of the present invention for achieving the above object, the breaker is installed in the trunk branch branched from the bus, in the safety relay to open the breaker to prevent the failure of the load in case of power failure: in the bus through the coil An AC / DC converter which receives the induced AC power and converts the power into DC power and supplies power to all circuits of the relay; A first relay unit configured to supply operating power to a first magnet coil to open and close the breaker, and to be opened and closed by a second magnet coil; Second relay means connected between an output terminal of the AC / DC converter and a second magnet coil to open / close a power applied to the magnet coil; A detection circuit unit which is operated by receiving power output from the AC / DC converter, and receives power input from a predetermined magnetic detection means through each input port and detects an error in circuit design or operation of the relay; A first microprocessor which receives a signal output through the detection circuit unit and determines a power failure or an operation error of the relay and outputs a display and control signal corresponding thereto; Receiving a signal output through the detection circuit unit to determine a power supply abnormality or an operation error of the relay, and cross-checking with the first microprocessor to mutually monitor the operation state, and output a corresponding display and control signal Microprocessor; Display means for displaying an abnormality according to a determination result of the design and operation states of the first and second microprocessors; A first AND gate controlling the operation of the second magnet coil by ANDing the output signals of the first and second microprocessors; And a second AND gate for controlling the opening and closing of the second relay means by ANDing the output signals of the first and second microprocessors.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

2 shows a relay applied to the present invention and a peripheral circuit thereof, and includes a load 10, a breaker 30, a coil 50, a magnetic detection means 70, and a relay 100.

A load 10 such as a motor or a power device is connected to one end of the trunk line branched from the bus, and a safety circuit breaker 30 for opening and closing the power supply is provided at the front end of the load 10.

In addition, the coil 50 has a primary coil L1 connected to another trunk line branched from the bus, and an input terminal of the relay 100 is connected to the secondary coil L2.

That is, the relay 100 receives the power induced through the coil 50 through the input terminals IN1 and IN2 to drive the relay 100 and determines whether the power is abnormal, and then opens and closes the breaker 30. Control.

The circuit breaker 30 is determined by an output signal of the first relay unit 120 embedded in the relay 100, and each switch of the first relay unit 120 is opened in a normal state. ) In addition, the R1-R2 ports of the relay 100 connected to the magnetic detection means 70 (SS and RS) are reset input terminals, and the P1-P2 and P3-P4 ports are input / output units connected to the emergency switch (SS) or the safety door. to be.

The emergency switch (SS) is associated with the P1-P2, P3-P4 port as shown, the emergency switch (SS) is in a ready state that is closed in the normal state, the R1-R2 terminal The reset switch RS installed is ready in the normal state.

When the reset switch RS is closed, the first relay unit 120 is operated and maintained, and even if the reset switch RS is closed once, the first relay unit 120 maintains an operating state.

As soon as the emergency switch SS is opened, the first relay unit 120 is stopped and initialized, and the user must manually reactivate the reset switch RS for safety.

3 is an internal block diagram showing a self-diagnosis relay 100 according to an embodiment of the present invention, wherein the AC / DC conversion unit 110, the first relay unit 120, the second relay unit 130, The detection circuit unit 140, the first microprocessor 150, the second microprocessor 160, the display means 170, the first end gate 180 and the second end gate 190 and the like.

In general, the safety relay 100 automatically opens the circuit breaker 30 connected to the load 10 when there is an error in the power supply, thereby preventing the failure of the load 10 and the resulting property loss. .

Relay 100 according to the present invention having such a function, after receiving the AC power induced in the bus through the coil 50 through the input terminals (IN1, IN2) to convert the appropriate DC power relay 100 AC / DC converter 110 for supplying power to the various circuits of the supply circuit and the first magnet coil (MC1, MC2) for opening and closing the circuit breaker 30 to supply the operating power to the second magnet coil (MC11, MC12) A first relay unit 120 including two relay switches opened and closed by a second relay switch, and a second magnet coil MC11 connected between an output terminal of the AC / DC converter 110 and second magnet coils MC11 and MC12. , The second relay means 130 for opening and closing the power applied to the MC12 and the power supplied from the AC / DC converter 110 is operated by a predetermined dry contact (Dry Contact) method Power inputted through the input ports P1 to P4, Y1, R1-R2 of the detection means 70 (SS, RS) The detection circuit unit 140 detects an error in the circuit design or operation of the relay 100, and receives a signal output through the detection circuit unit 140 to determine a power supply abnormality or an operation error of the relay 100. After receiving the first microprocessor 150 for outputting the corresponding display and control signal, and the signal output through the detection circuit unit 140 to determine the power failure or operation error of the relay 100 Cross-check with the first microprocessor 150 to monitor the operation state and then output a display and control signal corresponding to the second microprocessor 150, and the first and second microprocessors 150 and 160 The second magnet coil is formed by logically multiplying the output signals of the first and second microprocessors 150 and 160 by two display means 170 for displaying an abnormality according to a design and operation state. The first AND gate 180 for controlling the operation of the MC11 and MC12 and the output signals of the first and second microprocessors 150 and 160 are ANDed to control the opening and closing of the second relay means 130. And a second end gate 190 or the like.

The first relay unit 120 includes a plurality of two-stage switch groups S1 to S6, and the first-stage switch groups S1 to S3 are output signals of the first and second microprocessors 150 and 160. Is opened and closed by an output signal of the first AND gate 180 which multiplies by, and the two-stage switch groups S4 through S6 are second AND gates which AND the output signals of the first and second microprocessors 150 and 160. It is opened and closed by the output signal of 190.

In addition, the input port of the detection circuit unit 140 checks the wiring of the relay and the first ports P1 to P4 connected to the emergency switch SS for inputting an operation stop command, and automatically opens when an error occurs in the relay. The second port R1-R2 equipped with a reset switch RS which is manually operated after being set, and an input mode for selecting whether the input method of the first port is internal power or external power of the relay. It is composed of a third port (Y1), two magnet coils MC111 for monitoring the operation state of the first relay unit by receiving the output of the first relay unit 120 to the second port (R1-R2) MC112 is connected in series with the reset switch RS.

The display means 170 emits light according to a control signal of the second microprocessor 160 when the first and second microprocessors 150 and 160 cross check and there is an abnormality in the first microprocessor 150. When the first light emitting diode LED1 and the first and second microprocessors 150 and 160 cross check and there is an error in the second microprocessor 160, light is emitted according to the control signal of the first microprocessor 150. The second light emitting diode LED2 and a third light emitting diode LED3 emitting light when there is no abnormality by multiplying the signals output from the first and second microprocessors 150 and 160.

That is, the relay 100 according to the present invention feeds back the output of the first relay unit 120 through the switches MC111 and MC112 of the R1-R2 terminals of the detection circuit unit 140 in the microprocessors 150 and 160. It is configured to monitor the operation state of the first relay unit 120 can be more accurate control.

In addition, all inputs are simultaneously examined by the first microprocessor 150 and the second microprocessor 160 so that they can only be activated if they are recognized as correct and appropriate inputs. In addition, since the output also operates only when both the first microprocessor 150 and the second microprocessor 160 recognize the output, the relay 100 operates only in certain logic.

This makes it possible to check and eliminate the malfunction caused by the unstable operation of the conventional reset switch RS.

The Y1 port is a mode selection port for determining whether to connect the inputs of P2 and P4 to the outputs of P1 and P3 only or to be connected by an external power source. When the internal connection is selected, the Y1 port can detect an error due to incorrect wiring. Since the first microprocessor 150 and the second microprocessor 160 operate in synchronization with each other, if a problem occurs in the first microprocessor 150, the second light emitting diode ( Immediate action is possible by emitting only LED2) or outputting alarm signal.

In addition, the AC / DC converter 110 has a low voltage lock function, and when the input voltage is lower than the rated voltage, it is automatically shut down to prevent an error.

While specific embodiments of the present invention have been described and illustrated above, it will be apparent that the present invention may be embodied in various modifications by those skilled in the art. Such modified embodiments should not be individually understood from the technical spirit or the prospect of the present invention, but should fall within the claims appended to the present invention.

Therefore, in the present invention, the operation of the main relay switch built in the relay is controlled by cross-checking and controlling the state of the relay and the input power, etc. while the two microprocessors are synchronized with each other, so that stable operation can be performed. Self-diagnosis is possible by adding wiring inspection, cross-checking of input and output, and fault alarm function, which increases the operation reliability of the relay.

Claims (4)

In a safety relay that has a breaker installed in the trunk branched from the bus, and opens the breaker to prevent a load failure in case of power failure: An AC / DC conversion unit which receives AC power induced from the bus through a coil, converts the DC power into DC power, and supplies power to the general circuit of the relay; A first relay unit configured to supply operating power to a first magnet coil to open and close the breaker, and to be opened and closed by a second magnet coil; Second relay means connected between an output terminal of the AC / DC converter and a second magnet coil to open / close a power applied to the magnet coil; A detection circuit unit which is operated by receiving power output from the AC / DC converter, and receives power input from a predetermined magnetic detection means through each input port and detects an error in circuit design or operation of the relay; A first microprocessor which receives a signal output through the detection circuit unit and determines a power failure or an operation error of the relay and outputs a display and control signal corresponding thereto; Receiving a signal output through the detection circuit unit to determine a power supply abnormality or an operation error of the relay, and cross-checking with the first microprocessor to mutually monitor the operation state, and output a corresponding display and control signal Microprocessor; Display means for displaying an abnormality according to a determination result of the design and operation states of the first and second microprocessors; A first AND gate controlling the operation of the second magnet coil by ANDing the output signals of the first and second microprocessors; And And a second end gate for controlling the opening and closing of the second relay means by multiplying the output signals of the first and second microprocessors. The method according to claim 1, The input port of the detection circuit portion, A first port to which an emergency switch for inputting a stop command is connected; A second port equipped with a reset switch which is manually operated after being automatically opened in the event of a relay failure; And And a third port for selecting an input mode according to whether the input method of the first port is an internal power source or an external power source of the relay. The method according to claim 2, The second port is a self-diagnostic type safety relay, characterized in that the two magnetic coils for monitoring the operating state of the first relay unit in response to the output of the first relay unit in series with the reset switch. The method according to claim 1, The display means, A first light emitting diode which cross-checks the first and second microprocessors and emits light according to a control signal of the second microprocessor when there is an error in the first microprocessor; A second light emitting diode which cross-checks the first and second microprocessors and emits light according to a control signal of the first microprocessor when there is an error in the second microprocessor; And A self-diagnostic type safety relay comprising: a third light emitting diode which emits light when there is no abnormality by multiplying the signals output from the first and second microprocessors.