CN113640661A - Line fault monitoring system based on safety relay - Google Patents
Line fault monitoring system based on safety relay Download PDFInfo
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- CN113640661A CN113640661A CN202110983985.4A CN202110983985A CN113640661A CN 113640661 A CN113640661 A CN 113640661A CN 202110983985 A CN202110983985 A CN 202110983985A CN 113640661 A CN113640661 A CN 113640661A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 89
- 230000005284 excitation Effects 0.000 claims abstract description 74
- 230000009466 transformation Effects 0.000 claims abstract description 60
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
- G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
Abstract
The embodiment of the invention discloses a line fault monitoring system based on a safety relay. This line fault monitoring system based on safety relay includes: the device comprises an excitation module, a comparison module, an impedance transformation module and a control module; when the circuit of the safety relay and the load to be tested need to be monitored, the first monitoring loop is controlled to be conducted through the control module, after the first monitoring loop is conducted, the voltage of the load to be tested is compared with the preset voltage, a corresponding level signal is output to the impedance transformation module when corresponding preset conditions are met, the output impedance of the impedance transformation module can be adjusted through the corresponding level signal, and finally the control module judges whether the circuit of the safety relay and the load to be tested have faults or not according to the output impedance of the impedance transformation module, so that fault monitoring of the circuit of the safety relay and the load to be tested is achieved, and normal use of the circuit of the safety relay and the load to be tested is guaranteed.
Description
Technical Field
The embodiment of the invention relates to the technical field of safety monitoring, in particular to a line fault monitoring system based on a safety relay.
Background
The electric safety relay is generally adopted in a fire and gas (F & G) safety system, and the main principle is that an electronic control circuit and the relay are combined to ensure that a command sent by a controller of the F & G safety system is reliably executed within a design time so as to control an actuating mechanism to act, so that the safety of the whole system can be improved.
However, the safety relay does not need to operate when no accident occurs, and since the unnecessary operation cycle is long, a fault such as an open circuit or a short circuit may occur in the line of the safety relay due to a line contact failure, a line damage, or the like, thereby affecting the normal execution of the safety function. Therefore, how to monitor the fault of the line of the safety relay is in urgent need.
Disclosure of Invention
The invention provides a line fault monitoring system based on a safety relay, which is used for monitoring faults of a line of the safety relay.
The embodiment of the invention provides a line fault monitoring system based on a safety relay, which comprises: the device comprises an excitation module, a comparison module, an impedance transformation module and a control module; the excitation module and a load to be tested form a first monitoring loop, the excitation module is connected with the control module, and the control module is used for controlling the connection or disconnection of the first monitoring loop;
the comparison module is respectively connected with the load to be tested and the impedance transformation module, and the impedance transformation module is connected with the control module;
the comparison module is used for comparing the voltage of the load to be detected with a preset voltage under the conducting state of the first monitoring loop and outputting a corresponding level signal according to a comparison result to adjust the output impedance of the impedance conversion module; the control module is further used for judging whether the load to be tested has a fault according to the output impedance.
Optionally, the excitation module includes an excitation relay and a first resistor, a normally closed contact of the excitation relay is connected to a first end of the first resistor, a normally open contact of the excitation relay is connected to a second end of the load to be measured, a second end of the first resistor is connected to the first end of the load to be measured, one end of a coil of the excitation relay is connected to an excitation voltage end, the excitation voltage end is connected to the control module, and the other end of the coil of the excitation relay is grounded; when the control module sends an excitation voltage signal to the excitation voltage end, the excitation relay is conducted, and the excitation relay, the first resistor and the load to be detected form the first monitoring loop.
Optionally, the comparison module includes a first comparison unit and a second resistor, the second resistor is connected to the load to be tested and the first comparison unit, and the first comparison unit is connected to the impedance transformation module; the first comparison unit is used for comparing the voltage of the load to be detected with a first preset voltage in the conducting state of the first monitoring loop, and outputting a corresponding level signal according to a comparison result to adjust the output impedance of the impedance conversion module.
Optionally, the first comparing unit includes a first comparator, a third resistor and a fourth resistor, a first input terminal of the first comparator is connected to the second resistor, a second input terminal of the first comparator is connected to a first terminal of the third resistor and a first terminal of the fourth resistor, respectively, and an output terminal of the first comparator is connected to the impedance transforming module; the second end of the third resistor is connected with a power supply end, and the second end of the fourth resistor is grounded.
Optionally, the line fault monitoring system based on the safety relay further comprises an amplifying module;
the comparison module further comprises a second comparison unit, and the amplification module is respectively connected with the second resistor and the second comparison unit; the amplifying module is used for amplifying the voltage of the load to be detected by a preset multiple and outputting the amplified voltage to the second comparing unit in the conducting state of the first monitoring loop; and the second comparison unit is used for comparing the voltage amplified by the preset times with a second preset voltage and outputting a corresponding level signal according to a comparison result to adjust the output impedance of the impedance conversion module.
Optionally, the amplifying module includes an operational amplifier, a fifth resistor and a sixth resistor, a first input end of the operational amplifier is connected to the second resistor, a second input end of the operational amplifier is connected to a first end of the fifth resistor and a first end of the sixth resistor, respectively, an output end of the operational amplifier is connected to a second end of the fifth resistor and the second comparing unit, respectively, and a second end of the sixth resistor is grounded.
Optionally, the second comparing unit includes a second comparator, a seventh resistor, and an eighth resistor, a first input end of the second comparator is connected to the amplifying module, a second input end of the second comparator is connected to a first end of the seventh resistor and a first end of the eighth resistor, respectively, an output end of the second comparator is connected to the impedance transforming module, a second end of the seventh resistor is connected to the power supply terminal, and a second end of the eighth resistor is grounded.
Optionally, the line fault monitoring system based on the safety relay further includes an isolation module, and the isolation module is respectively connected to the comparison module and the impedance transformation module.
Optionally, the isolation module includes an optical coupler and a first transistor, a control end of the first transistor is connected to the comparison module, a first end of the first transistor is connected to a first input end of the optical coupler, and a second end of the first transistor is grounded; the second input end of the optical coupler is connected with a power supply end, the first output end of the optical coupler is connected with the impedance transformation module, and the second output end of the optical coupler is connected with the power supply end.
Optionally, the impedance transformation module includes a second transistor and a ninth resistor, a control end of the second transistor is connected to the comparison module, a first end of the second transistor is connected to a first end of the ninth resistor, a second end of the ninth resistor is connected to the control module, and a second end of the second transistor is grounded.
The invention provides a line fault monitoring system based on a safety relay, which comprises: the device comprises an excitation module, a comparison module, an impedance transformation module and a control module; the excitation module and the load to be detected form a first monitoring loop, the excitation module is connected with the control module, and the control module is used for controlling the connection or disconnection of the first monitoring loop; the comparison module is respectively connected with the load to be tested and the impedance transformation module, and the impedance transformation module is connected with the control module; the comparison module is used for comparing the voltage of the load to be detected with a preset voltage under the conducting state of the first monitoring loop and outputting a corresponding level signal according to the comparison result to adjust the output impedance of the impedance conversion module; the control module is also used for judging whether the load to be detected has a fault according to the output impedance. Therefore, when the circuit of the safety relay and the load to be tested need to be monitored, the first monitoring loop is controlled to be conducted through the control module, after the first monitoring loop is conducted, the voltage of the load to be tested is compared with the preset voltage, a corresponding level signal is output to the impedance transformation module when corresponding preset conditions are met, the output impedance of the impedance transformation module can be adjusted through the corresponding level signal, and finally the control module judges whether the circuit of the safety relay and the load to be tested break down or not according to the output impedance of the impedance transformation module, so that fault monitoring is conducted on the circuit of the safety relay and the load to be tested, and normal use of the circuit of the safety relay and the load to be tested is guaranteed.
Drawings
Fig. 1 is a block diagram of a line fault monitoring system based on a safety relay according to a first embodiment of the present invention;
fig. 2 is a schematic circuit structure diagram of a line fault monitoring system based on a safety relay according to a second embodiment of the present invention;
fig. 3 is a schematic circuit structure diagram of a line fault monitoring system based on a safety relay in a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a block diagram of a line fault monitoring system based on a safety relay according to a first embodiment of the present invention. Referring to fig. 1, the safety relay based line fault monitoring system includes: the device comprises an excitation module 10, a comparison module 20, an impedance transformation module 30 and a control module 40; the excitation module 10 and the load 50 to be tested form a first monitoring loop L0, the excitation module 10 is connected with the control module 40, and the control module 40 is used for controlling the connection or disconnection of the first monitoring loop L0;
the comparison module 20 is respectively connected with the load 50 to be tested and the impedance transformation module 30, and the impedance transformation module 30 is connected with the control module 40;
the comparison module 20 is configured to compare the voltage of the load 50 to be measured with a preset voltage in a conducting state of the first monitoring loop L0, and output a corresponding level signal according to a comparison result to adjust the output impedance of the impedance transformation module 30; the control module 40 is further configured to determine whether the load 50 to be tested has a fault according to the output impedance.
The excitation module 10 is connected to the control module 40, and the control module 40 is configured to control the first monitoring loop L0 to be turned on or off, and includes: the first monitoring loop L0 is turned on or off by controlling the excitation module 10 to be turned on or off. The control module 40 may control the excitation module 10 to be turned on or off by determining whether to output the excitation voltage signal, that is, the excitation module 10 is controlled to be turned on when the excitation voltage signal is output, and is otherwise controlled to be turned off.
The level signal output according to the comparison result may be a high level signal or a low level signal. For example, the voltage of the load 50 to be tested is compared with a preset voltage, if the comparison result is a high level signal, the high level signal may enable the impedance transformation module 30 to output a normal impedance, and the control module 40 may detect the normal impedance, and accordingly, the control module 40 may determine that the line of the safety relay and the load 50 to be tested do not have a fault; if the comparison result is that a low level signal is output, the low level signal makes the output impedance of the impedance transformation module 30 be in a high impedance state, and the control module 40 detects the high impedance state, so that it can be determined that the line of the safety relay and the load 50 to be tested have a fault.
The control module 40 may be a single chip microcomputer.
In the technical scheme of this embodiment, the implementation process of the line fault monitoring system based on the safety relay is as follows: referring to fig. 1, for example, taking a safety relay as an example for a fire extinguishing scene, the load 50 to be tested may be a switch for controlling the fire extinguisher to be turned on or off, the safety relay is used for turning on the switch of the fire extinguisher when fire is to be extinguished, and the switch of the fire extinguisher is turned off when fire is not to be extinguished. In order to ensure that the fire extinguisher switch can be normally turned on to ensure safe operation every time the fire extinguisher switch needs to be turned on, fault monitoring needs to be performed on a control circuit of the safety relay controlling the fire extinguisher switch or the fire extinguisher switch during the period when the fire extinguisher switch is turned off or not in operation. That is, when the safety relay controls the fire extinguisher switch to operate and execute the fire extinguishing task device, the fire extinguishing task device does not need to be monitored, and at the moment, the control module 40 controls the first monitoring loop L0 to be disconnected; when the fire extinguisher switch does not need to act to execute a fire extinguishing device, namely a fault condition needs to be monitored, the control module 40 controls the first monitoring loop L0 to be conducted, and after the first monitoring loop L0 is conducted, the comparison module 20 compares the voltage of the load 50 to be detected with a preset voltage and outputs a corresponding level signal according to a comparison result; if the comparison result is a high level signal, the high level signal may enable the impedance transformation module 30 to output a normal impedance, and the control module 40 may detect the normal impedance, and accordingly the control module 40 may determine that the line of the safety relay and the load 50 to be tested have not failed; if the comparison result is that a low level signal is output, the low level signal makes the output impedance of the impedance transformation module 30 be in a high impedance state, and the control module 40 detects the high impedance state, so that it can be determined that the line of the safety relay and the load 50 to be tested have a fault. Therefore, when the line of the safety relay and the load 50 to be tested need to be monitored, the first monitoring loop L0 is controlled to be switched on through the control module 40, after the first monitoring loop L0 is switched on, the voltage of the load 50 to be tested is compared with the preset voltage, when the corresponding preset condition is met, the corresponding level signal is output to the impedance transformation module 30, the output impedance of the impedance transformation module 30 can be adjusted through the corresponding level signal, and finally, the control module 40 judges whether the line of the safety relay and the load 50 to be tested have faults or not according to the output impedance of the impedance transformation module 30, so that the fault monitoring of the line of the safety relay and the load 50 to be tested is realized, and the normal use of the line of the safety relay and the load 50 to be tested is ensured.
The technical solution of this embodiment is to provide a line fault monitoring system based on a safety relay, and the line fault monitoring system based on the safety relay includes: the device comprises an excitation module, a comparison module, an impedance transformation module and a control module; the excitation module and the load to be detected form a first monitoring loop, the excitation module is connected with the control module, and the control module is used for controlling the connection or disconnection of the first monitoring loop; the comparison module is respectively connected with the load to be tested and the impedance transformation module, and the impedance transformation module is connected with the control module; the comparison module is used for comparing the voltage of the load to be detected with a preset voltage under the conducting state of the first monitoring loop and outputting a corresponding level signal according to the comparison result to adjust the output impedance of the impedance conversion module; the control module is also used for judging whether the load to be detected has a fault according to the output impedance. Therefore, when the circuit of the safety relay and the load to be tested need to be monitored, the first monitoring loop is controlled to be conducted through the control module, after the first monitoring loop is conducted, the voltage of the load to be tested is compared with the preset voltage, a corresponding level signal is output to the impedance transformation module when corresponding preset conditions are met, the output impedance of the impedance transformation module can be adjusted through the corresponding level signal, and finally the control module judges whether the circuit of the safety relay and the load to be tested break down or not according to the output impedance of the impedance transformation module, so that fault monitoring is conducted on the circuit of the safety relay and the load to be tested, and normal use of the circuit of the safety relay and the load to be tested is guaranteed.
Example two
Fig. 2 is a schematic circuit structure diagram of a line fault monitoring system based on a safety relay according to a second embodiment of the present invention. On the basis of the first embodiment, optionally, referring to fig. 2, the excitation module 10 includes an excitation relay K0 and a first resistor R1, a normally closed contact K1 of the excitation relay K0 is connected to a first end of the first resistor R1, a normally open contact K2 of the excitation relay K0 is connected to a second end of the load 50 to be tested, a second end of the first resistor R1 is connected to a first end of the load 50 to be tested, one end of a coil M0 of the excitation relay K0 is connected to an excitation voltage end V0, the excitation voltage end V0 is connected to the control module 40, and the other end of a coil M0 of the excitation relay K0 is grounded; when the control module 40 sends an excitation voltage signal to the excitation voltage end V0, the excitation relay K0 is turned on, and the excitation relay K0, the first resistor R1 and the load 50 to be tested form a first monitoring loop L0.
The excitation relay K0 may be a single-blade switch, a double-blade switch, or the like. Illustratively, taking a double-blade switch as an example, referring to fig. 2, the energizing relay K0 includes a first normally closed contact K1 and a second normally closed contact K2, and a first normally open contact K3 and a second normally open contact K4. The driving voltage signal sent by the control module 40 to the driving voltage terminal V0 may be the power voltage signal VDD.
When the safety relay controls the load 50 to be tested to stop acting, the control module 40 sends an excitation voltage signal to the excitation voltage end V0 to control the excitation relay K0 to be switched on, namely, the excitation voltage end V0 receives the excitation voltage, and then the coil M0 is electrified, and after the coil M0 is electrified, the first normally closed contact K1 and the second normally closed contact K2 are switched off, and the first normally open contact K3 and the second normally open contact K4 are closed, and the first monitoring circuit L0 is switched on after the first normally open contact K3 and the second normally open contact K4 are closed. After the first monitoring loop L0 is turned on, the comparing module 20 detects the voltage of the load 50 to be tested, compares the voltage of the load 50 to be tested with a preset voltage, and outputs a corresponding level signal according to the comparison result to adjust the output impedance of the impedance transformation module 30, and the control module 40 determines whether the load to be tested has a fault according to the output impedance, thereby determining whether the line of the safety relay has a fault.
Optionally, referring to fig. 2, the comparing module 20 includes a first comparing unit 21 and a second resistor R2, the second resistor R2 is connected to the load 50 to be tested and the first comparing unit 21, respectively, and the first comparing unit 21 is connected to the impedance transforming module 30; the first comparing unit 21 is configured to compare the voltage of the load 50 to be measured with a first preset voltage in a conducting state of the first monitoring loop L0, and output a corresponding level signal according to a comparison result to adjust the output impedance of the impedance transforming module 30.
The first preset voltage is a reference voltage of the first comparing unit 21, and the first comparing unit 21 is configured to detect whether an open-circuit fault occurs in a line of the safety relay and/or the load 50 to be tested. Specifically, the voltage of the load 50 to be tested is compared with a first preset voltage, when the voltage of the load 50 to be tested is smaller than the first preset voltage, the first comparing unit 21 outputs a high level signal to the impedance transformation module 30, the high level signal enables the output impedance of the impedance transformation module 30 to be a normal impedance, and the control module 40 can detect the normal impedance, and accordingly the control module 40 can determine that the open circuit fault does not occur in the line of the safety relay and/or the load 50 to be tested; when the voltage of the load 50 to be tested is greater than the first preset voltage, the first comparing unit 21 outputs a low level signal to the impedance transformation module 30, the low level signal makes the output impedance of the impedance transformation module 30 be in a high impedance state, and the control module 40 detects the high impedance state, so that it can be determined that an open circuit fault occurs in the line of the safety relay and/or the load 50 to be tested.
The second resistor R2 is used for limiting current, and prevents the device from being damaged due to excessive current input to the first comparison unit 21.
Optionally, with continued reference to fig. 2, the first comparing unit 21 includes a first comparator U1, a third resistor R3 and a fourth resistor R4, a first input terminal of the first comparator U1 is connected to the second resistor R2, a second input terminal of the first comparator U1 is connected to a first terminal of the third resistor R3 and a first terminal of the fourth resistor R4, respectively, and an output terminal of the first comparator U1 is connected to the impedance transformation module 30; the second terminal of the third resistor R3 is connected to the power supply terminal VDD, and the second terminal of the fourth resistor R4 is connected to ground.
The first comparator U1, the third resistor R3 and the fourth resistor R4 constitute an open-circuit fault diagnosis circuit. The first preset voltage is a voltage divided by the third resistor R3 and the fourth resistor R4, and a specific value thereof may be determined according to actual resistance values of the third resistor R3 and the fourth resistor R4 and a current of the second input terminal of the first comparator U1, which is not limited specifically herein.
Optionally, with continued reference to fig. 2, the safety relay based line fault monitoring system further comprises an isolation module 60, the isolation module 60 being connected to the comparison module 20 and the impedance transformation module 30, respectively.
The isolation module 60 is configured to isolate the level signal output by the comparison module 20 and then transmit the isolated level signal to the impedance transformation module 30, so that fault detection of the load to be detected can be transmitted to the impedance transformation module 30 in a transmission manner, and a fault transmission function is achieved, thereby solving a problem that a fault condition of the load cannot be monitored by a system due to the fact that the load is insulated from a control monitoring loop after the existing safety relay is isolated.
Optionally, with continued reference to fig. 2, the isolation module 60 includes an optocoupler U2 and a first transistor Q1, a control terminal of the first transistor Q1 is connected to the comparison module 20, a first terminal of the first transistor Q1 is connected to a first input terminal of the optocoupler U2, and a second terminal of the first transistor Q1 is grounded; the second input end of the optical coupler U2 is connected with a power supply end VDD, the first output end of the optical coupler U2 is connected with the impedance transformation module 30, and the second output end of the optical coupler U2 is connected with the power supply end VDD.
The first transistor Q1 may be a triode or a MOS transistor. For example, taking the first transistor Q1 as a triode and an NPN-type triode as an example, when the comparison module 20 outputs a high level signal, since the first transistor Q1 is an NPN-type transistor, the high level signal turns on the control terminal of the first transistor Q1, the first transistor Q1 turns on and then controls the input terminal of the optocoupler U2 (i.e., the primary side of the optocoupler) to turn on, and the optocoupler U2 turns on and then transmits the high level signal to the impedance transformation module 30 after performing electrical isolation, the high level signal makes the output impedance of the impedance transformation module 30 be a normal impedance, and the control module 40 can detect the normal impedance, and accordingly, the control module 40 can determine that the line of the safety relay and/or the load 50 to be tested have no fault. When the comparison module 20 outputs a low level signal, since the first transistor Q1 is an NPN transistor, the low level signal turns off the first transistor Q1, the first transistor Q1 controls the input end of the optocoupler U2 (i.e., the primary side of the optocoupler) to be disconnected after being turned off, the optocoupler U2 is turned off so that the low level signal is transmitted to the impedance conversion module 30, the low level signal makes the output impedance of the impedance conversion module 30 be in a high impedance state, and the control module 40 detects the high impedance state, so that it can be determined that the line of the safety relay and/or the load 50 to be tested have a fault.
Optionally, referring to fig. 2, the isolation module 60 further includes an eleventh resistor R11, a twelfth resistor R12, and a thirteenth resistor R13. One end of the eleventh resistor R11 is connected to the control end of the first transistor Q1, the other end is connected to the power supply terminal VDD, and the eleventh resistor R11 serves as a pull-up resistor. The twelfth resistor R12 is connected between the control terminal and the second terminal of the first transistor Q1, and the twelfth resistor R12 is used for pulling down the resistor. The pull-up resistor R11 and the pull-down resistor R12 are used for reliably controlling the control terminal of the first transistor Q1. The thirteenth resistor R13 is connected between the second input end of the optocoupler U2 and the power supply end VDD, and the thirteenth resistor R13 is used for limiting current flowing through the primary side of the optocoupler U2 and preventing overcurrent from damaging the optocoupler U2.
Optionally, referring to fig. 2, the impedance transforming module 30 includes a second transistor Q2 and a ninth resistor R9, a control terminal of the second transistor Q2 is connected to the comparing module 20, a first terminal of the second transistor Q2 is connected to a first terminal of the ninth resistor R9, a second terminal of the ninth resistor R9 is connected to the control module 40, and a second terminal of the second transistor Q2 is grounded.
The ninth resistor R9 is used for simulating impedance, and the ninth resistor R9 is giga-level resistor; the second transistor Q2 acts as a switching transistor. Specifically, the second transistor Q2 may be an NPN transistor or an NPN MOS transistor. The impedance transformation of the ninth resistor R9 is related to the off or on condition of the second transistor Q2. For example, taking the second transistor Q2 as an NPN-type transistor as an example, when the comparison module 20 outputs a high-level signal, the high-level signal turns on the second transistor Q2, turns on the second transistor Q2, connects the ninth resistor R9 between the first end of the second transistor Q2 and the input end of the control module 40, and since the ninth resistor R9 is a resistor of a giga level, the control module 40 may detect the impedance of the ninth resistor R9, and accordingly determine that the line of the safety relay and/or the load 50 to be tested have not failed; when the comparing module 20 outputs a low level signal, the low level signal turns off the second transistor Q2, turns off the second transistor Q2, so that the ninth resistor R9 is disconnected from the input terminal of the control module 40, and the ninth resistor R9 is in a high impedance state, so that the control module 40 detects the high impedance state, and can determine that the line of the safety relay and/or the load 50 to be tested have a fault.
Optionally, referring to fig. 2, the impedance transforming module 30 further includes a tenth resistor R10, a first end of the tenth resistor R10 is connected to the control end of the second transistor Q2, and a second end of the tenth resistor R10 is connected to the comparing module 20 or the isolating module 60. The tenth resistor R10 is used for limiting current and preventing the second transistor Q2 from being damaged by excessive current.
In the technical scheme of this embodiment, the implementation process of the line fault monitoring system based on the safety relay is as follows: referring to fig. 2, the first transistor Q1 and the second transistor Q2 are NPN transistors for example. When the safety relay controls the load 50 to be tested to stop acting, the control module 40 sends an excitation voltage signal to the excitation voltage end V0 to control the excitation relay K0 to be switched on, namely, the coil M0 is powered after the excitation voltage end V0 receives the excitation voltage, and the coil M0 is powered, so that the first normally closed contact K1 and the second normally closed contact K2 are switched off, the first normally open contact K3 and the second normally open contact K4 are closed, and the first monitoring circuit L0 is switched on after the first normally open contact K3 and the second normally open contact K4 are closed. After the first monitoring loop L0 is turned on, the voltage of the load 50 to be tested, which is input at the first input end of the first comparator U1, is compared with the first preset voltage at the second input end of the first comparator U1, when the voltage of the load 50 to be tested is smaller than the first preset voltage, the first comparing unit 21 outputs a high level signal, because the first transistor Q1 is an NPN transistor, the high level signal turns on the control end of the first transistor Q1, the first transistor Q1 turns on the input end of the optocoupler U2 (i.e., the primary side of the optocoupler) and the optocoupler U2 turns on the optocoupler, the high level signal is transmitted to the control end of the second transistor Q2 after being electrically isolated, the high level signal turns on the second transistor Q2 and the second transistor Q2, the ninth resistor R9 is connected between the first end of the second transistor Q2 and the input end of the control module 40, and because the ninth resistor R9 is a gigabit-level resistor, therefore, the control module 40 can detect the impedance of the ninth resistor R9, and accordingly determine that the open-circuit fault does not occur in the line of the safety relay and/or the load 50 to be tested; when the voltage of the load 50 to be tested is greater than the first preset voltage, the first comparing unit 21 outputs a low level signal, because the first transistor Q1 is an NPN transistor, the low level signal turns off the first transistor Q1, the first transistor Q1 turns off the input end of the optocoupler U2 (i.e., the primary side of the optocoupler), the optocoupler U2 turns off the low level signal and transmits the low level signal to the control end of the second transistor Q2, the low level signal turns off the second transistor Q2, the second transistor Q2 turns off the ninth resistor R9 and the input end of the control module 40, the ninth resistor R9 is in a high impedance state, and the control module 40 detects the high impedance state and can determine that an open circuit fault occurs in the line of the safety relay and/or the load 50 to be tested. Therefore, open-circuit fault monitoring can be performed on the circuit of the safety relay and the load 50 to be tested, and normal use of the circuit of the safety relay and the load 50 to be tested is ensured.
EXAMPLE III
Fig. 3 is a schematic circuit structure diagram of a line fault monitoring system based on a safety relay according to a third embodiment of the present invention. On the basis of the above embodiment, optionally, referring to fig. 3, the line fault monitoring system based on the safety relay further includes an amplifying module 70; the comparison module 20 further includes a second comparison unit 22, and the amplification module 70 is respectively connected to the second resistor R2 and the second comparison unit 22; the amplifying module 70 is configured to amplify the voltage of the load 50 to be detected by a preset multiple and output the amplified voltage to the second comparing unit 22 when the first monitoring loop L0 is in a conducting state; the second comparing unit 22 is configured to compare the amplified voltage with a second preset voltage, and output a corresponding level signal according to the comparison result to adjust the output impedance of the impedance transforming module 30.
When the load 50 to be measured is a low load, the output voltage signal is weak, so that the voltage of the load 50 to be measured is amplified by a preset multiple through the amplifying module 70 and then output to the second comparing unit 22, and the amplified voltage is compared with the second preset voltage by the second comparing unit 22. The preset multiple can be set according to actual conditions, and is not specifically limited herein. The second preset voltage is a reference voltage of the second comparing unit 22, and the second comparing unit 22 is configured to detect whether a short-circuit fault occurs in the line of the safety relay and/or the load 50 to be tested.
Specifically, the voltage of the load 50 to be tested is amplified by the amplifying module 70 by a preset multiple and then output to the second comparing unit 22, the second comparing unit 22 compares the voltage amplified by the preset multiple with a second preset voltage, when the voltage amplified by the preset multiple is greater than the second preset voltage, the second comparing unit 22 outputs a high level signal to the impedance transformation module 30, the high level signal makes the output impedance of the impedance transformation module 30 be a normal impedance, and the control module 40 can detect the normal impedance, so that the control module 40 can determine that the line of the safety relay and/or the load 50 to be tested have no short-circuit fault according to the high level signal; when the amplified voltage is smaller than the second preset voltage, the second comparing unit 22 outputs a low level signal to the impedance transformation module 30, the low level signal makes the output impedance of the impedance transformation module 30 in a high impedance state, and the control module 40 detects the high impedance state, so that it can be determined that the short circuit fault occurs in the line of the safety relay and/or the load 50 to be tested.
Optionally, with continued reference to fig. 3, the amplifying module 70 includes an operational amplifier U3, a fifth resistor R5, and a sixth resistor R6, a first input terminal of the operational amplifier U3 is connected to the second resistor R2, a second input terminal of the operational amplifier U3 is connected to a first terminal of the fifth resistor R5 and a first terminal of the sixth resistor R6, respectively, an output terminal of the operational amplifier U3 is connected to a second terminal of the fifth resistor R5 and the second comparing unit 22, respectively, and a second terminal of the sixth resistor R6 is grounded.
The operational amplifier U3, the fifth resistor R5, and the sixth resistor R6 constitute a signal amplifier, which is used to amplify a weak voltage signal output by the load 50 to be tested and output the amplified weak voltage signal to the second comparing unit 22 when the load 50 to be tested is a low load, and the amplified weak voltage signal and the second comparing unit 22 form a short-circuit fault diagnosis circuit, so as to monitor whether a short-circuit fault occurs in the line of the safety relay and/or the load 50 to be tested.
Optionally, with continued reference to fig. 3, the second comparing unit 22 includes a second comparator U4, a seventh resistor R7, and an eighth resistor R8, a first input terminal of the second comparator U4 is connected to the amplifying module 70, a second input terminal of the second comparator U4 is connected to a first terminal of the seventh resistor R7 and a first terminal of the eighth resistor R8, respectively, an output terminal of the second comparator U4 is connected to the impedance transforming module 30, a second terminal of the seventh resistor R7 is connected to the power source terminal VDD, and a second terminal of the eighth resistor R8 is grounded.
The amplifying module 70, the second comparator U4, the seventh resistor R7 and the eighth resistor R8 constitute a short-circuit fault diagnosis circuit. The second preset voltage is a voltage divided by the seventh resistor R7 and the eighth resistor R8, and a specific value thereof may be determined according to actual resistance values of the seventh resistor R7 and the eighth resistor R8 and a current of the second input terminal of the second comparator U4, which is not limited specifically herein.
In the technical scheme of this embodiment, the implementation process of the line fault monitoring system based on the safety relay is as follows: referring to fig. 3, the first transistor Q1 and the second transistor Q2 are NPN transistors for example. When the safety relay controls the load 50 to be tested to stop acting, the control module 40 sends an excitation voltage signal to the excitation voltage end V0 to control the excitation relay K0 to be switched on, namely, the coil M0 is powered after the excitation voltage end V0 receives the excitation voltage, and the coil M0 is powered, so that the first normally closed contact K1 and the second normally closed contact K2 are switched off, the first normally open contact K3 and the second normally open contact K4 are closed, and the first monitoring circuit L0 is switched on after the first normally open contact K3 and the second normally open contact K4 are closed. After the first monitoring loop L0 is turned on, the voltage output by the load 50 to be tested is amplified by a preset multiple through the operational amplifier U3 and then output to the first input end of the second comparator U4, the voltage amplified by the preset multiple and input to the first input end of the second comparator U4 is compared with the second preset voltage input to the second input end of the second comparator U4, when the voltage amplified by the preset multiple is greater than the second preset voltage, the second comparing unit 22 outputs a high level signal, because the first transistor Q1 is an NPN transistor, the high level signal turns on the control end of the first transistor Q1, the first transistor Q1 turns on and then controls the input end of the optocoupler U2 (i.e., the primary side of the optocoupler) to turn on, the optocoupler U2 turns on and then electrically isolates the high level signal and transmits the high level signal to the control end of the second transistor Q2, the high level signal turns on the second transistor Q2, and the second transistor Q2 is turned on, the ninth resistor R9 is connected between the first end of the second transistor Q2 and the input end of the control module 40, and since the ninth resistor R9 is a gigabit-level resistor, the control module 40 can detect the impedance of the ninth resistor R9, and accordingly determine that the line of the safety relay and/or the load 50 to be tested has no short-circuit fault; when the amplified voltage of the preset multiple is smaller than the second preset voltage, the second comparing unit 22 outputs a low level signal, because the first transistor Q1 is an NPN transistor, the low level signal turns off the first transistor Q1, the first transistor Q1 turns off the input end of the optocoupler U2 (i.e., the primary side of the optocoupler), the optocoupler U2 turns off the low level signal and transmits the low level signal to the control end of the second transistor Q2, the low level signal turns off the second transistor Q2, the second transistor Q2 turns off the optocoupler, so that the ninth resistor R9 is disconnected from the input end of the control module 40, and the ninth resistor R9 is in a high impedance state, so that the control module 40 detects the high impedance state, and can determine that a short circuit fault occurs in the line of the safety relay and/or the load 50 to be tested. Therefore, short-circuit fault monitoring can be carried out on the circuit of the safety relay and the load 50 to be tested, and normal use of the circuit of the safety relay and the load 50 to be tested is guaranteed. In addition, for monitoring the open circuit fault of the line of the safety relay and the load 50 to be tested, reference may be made to the second embodiment described above, and details are not described herein again.
Example four
The fourth embodiment of the invention also provides a safety relay, which comprises the safety relay line fault monitoring system in any embodiment of the invention.
Among other things, safety relays may be used to detect fire suppression systems, fire and gas (F & G) safety systems, and the like.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A line fault monitoring system based on a safety relay, comprising: the device comprises an excitation module, a comparison module, an impedance transformation module and a control module; the excitation module and a load to be tested form a first monitoring loop, the excitation module is connected with the control module, and the control module is used for controlling the connection or disconnection of the first monitoring loop;
the comparison module is respectively connected with the load to be tested and the impedance transformation module, and the impedance transformation module is connected with the control module;
the comparison module is used for comparing the voltage of the load to be detected with a preset voltage under the conducting state of the first monitoring loop and outputting a corresponding level signal according to a comparison result to adjust the output impedance of the impedance conversion module; the control module is further used for judging whether the load to be tested has a fault according to the output impedance.
2. The safety relay based line fault monitoring system according to claim 1, wherein the excitation module comprises an excitation relay and a first resistor, a normally closed contact of the excitation relay is connected with a first end of the first resistor, a normally open contact of the excitation relay is connected with a second end of a load to be tested, the second end of the first resistor is connected with the first end of the load to be tested, one end of a coil of the excitation relay is connected with an excitation voltage end, the excitation voltage end is connected with the control module, and the other end of the coil of the excitation relay is grounded; when the control module sends an excitation voltage signal to the excitation voltage end, the excitation relay is conducted, and the excitation relay, the first resistor and the load to be detected form the first monitoring loop.
3. The line fault monitoring system based on the safety relay as claimed in claim 1, wherein the comparison module comprises a first comparison unit and a second resistor, the second resistor is respectively connected with the load to be tested and the first comparison unit, and the first comparison unit is connected with the impedance transformation module; the first comparison unit is used for comparing the voltage of the load to be detected with a first preset voltage in the conducting state of the first monitoring loop, and outputting a corresponding level signal according to a comparison result to adjust the output impedance of the impedance conversion module.
4. The line fault monitoring system based on the safety relay as claimed in claim 3, wherein the first comparing unit comprises a first comparator, a third resistor and a fourth resistor, a first input terminal of the first comparator is connected with the second resistor, a second input terminal of the first comparator is respectively connected with a first terminal of the third resistor and a first terminal of the fourth resistor, and an output terminal of the first comparator is connected with the impedance transformation module; the second end of the third resistor is connected with a power supply end, and the second end of the fourth resistor is grounded.
5. The safety relay based line fault monitoring system of claim 3, further comprising an amplification module;
the comparison module further comprises a second comparison unit, and the amplification module is respectively connected with the second resistor and the second comparison unit; the amplifying module is used for amplifying the voltage of the load to be detected by a preset multiple and outputting the amplified voltage to the second comparing unit in the conducting state of the first monitoring loop; and the second comparison unit is used for comparing the voltage amplified by the preset times with a second preset voltage and outputting a corresponding level signal according to a comparison result to adjust the output impedance of the impedance conversion module.
6. The safety relay based line fault monitoring system according to claim 5, wherein the amplifying module comprises an operational amplifier, a fifth resistor and a sixth resistor, a first input terminal of the operational amplifier is connected with the second resistor, a second input terminal of the operational amplifier is respectively connected with a first terminal of the fifth resistor and a first terminal of the sixth resistor, an output terminal of the operational amplifier is respectively connected with a second terminal of the fifth resistor and the second comparing unit, and a second terminal of the sixth resistor is grounded.
7. The safety relay based line fault monitoring system according to claim 5 or 6, wherein the second comparing unit comprises a second comparator, a seventh resistor and an eighth resistor, a first input terminal of the second comparator is connected to the amplifying module, a second input terminal of the second comparator is respectively connected to a first terminal of the seventh resistor and a first terminal of the eighth resistor, an output terminal of the second comparator is connected to the impedance transformation module, a second terminal of the seventh resistor is connected to a power supply terminal, and a second terminal of the eighth resistor is connected to ground.
8. The safety relay based line fault monitoring system of claim 1, further comprising an isolation module connected to the comparison module and the impedance transformation module, respectively.
9. The safety relay based line fault monitoring system according to claim 8, wherein the isolation module comprises an optical coupler and a first transistor, a control terminal of the first transistor is connected with the comparison module, a first terminal of the first transistor is connected with a first input terminal of the optical coupler, and a second terminal of the first transistor is grounded; the second input end of the optical coupler is connected with a power supply end, the first output end of the optical coupler is connected with the impedance transformation module, and the second output end of the optical coupler is connected with the power supply end.
10. The safety relay based line fault monitoring system of claim 1, wherein the impedance transformation module comprises a second transistor and a ninth resistor, a control terminal of the second transistor is connected to the comparison module, a first terminal of the second transistor is connected to a first terminal of the ninth resistor, a second terminal of the ninth resistor is connected to the control module, and a second terminal of the second transistor is connected to ground.
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| CN117368798A (en) * | 2023-12-04 | 2024-01-09 | 浙江国利信安科技有限公司 | Fault detection circuit and related circuitry |
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