CN114759521A - Residual current operated protector and method for executing self-detection thereof - Google Patents
Residual current operated protector and method for executing self-detection thereof Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 187
- 230000001012 protector Effects 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000012360 testing method Methods 0.000 claims description 34
- 230000006870 function Effects 0.000 description 17
- 238000010586 diagram Methods 0.000 description 5
- 230000033228 biological regulation Effects 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
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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
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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
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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
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
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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
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/128—Manual release or trip mechanisms, e.g. for test purposes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
- H01H83/14—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection
- H01H83/144—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection with differential transformer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/33—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers
- H02H3/334—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers with means to produce an artificial unbalance for other protection or monitoring reasons or remote control
- H02H3/335—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers with means to produce an artificial unbalance for other protection or monitoring reasons or remote control the main function being self testing of the device
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2300/00—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H
- H01H2300/052—Controlling, signalling or testing correct functioning of a switch
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Testing Of Individual Semiconductor Devices (AREA)
- Amplifiers (AREA)
- Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The embodiment of the disclosure provides a residual current operated protector and a method for executing self-detection thereof. The residual current operated protector (100) comprises an automatic detection module (130) configured to, during execution of the detection: sending the simulated leakage current to the residual current detection processing module (110), and detecting a fault related to the residual current detection processing module (110) based on a response of the residual current detection processing module (110) to the simulated leakage current; and sending a drive signal to the trip module (120), and detecting a fault associated with the trip module (120) based on a response of the trip module (120) to the drive signal, wherein the drive signal and the analog leakage signal are independent of each other. According to the residual current operated protection device of the embodiment of the disclosure, automatic detection of the residual current operated protection device can be realized.
Description
Technical Field
Embodiments of the present disclosure relate to a residual current operated protection device, and more particularly, to a residual current operated protection device capable of performing self-detection. Embodiments of the present disclosure also relate to a method for a residual current operated protector to perform self-detection.
Background
The residual current operated protector is a safety product widely used for a power system, is used for protecting personal safety and property safety of users, has very high requirements on the reliability of the product, and can cause serious consequences once being damaged. Traditional residual current operated protective device all is furnished with test button to make things convenient for the user to detect product property ability regularly, thereby the reliable work of guarantee product. However, users often neglect the regular detection of the residual current operated protector, so that the products are not maintained for several years or even for over ten years after being installed, and the users cannot find that the products are damaged, so that the leakage protection function of the power system fails, and huge potential safety hazards are caused.
In order to solve the problems, the residual current operated protector with the self-checking function is produced, manual intervention of a user is not needed, and automatic regular detection can be carried out to ensure normal operation of the leakage protection function. However, the conventional residual current operated protector with the self-checking function can only test part of components of the residual current operated protector, and cannot realize comprehensive detection of the residual current operated protector; in addition, the conventional residual current operated protection device with the self-checking function has limited detection of the leakage type, so that the application field of the conventional residual current operated protection device with the self-checking function is limited.
It is therefore desirable to provide a residual current device which can be retrofitted to conventional residual current devices.
Disclosure of Invention
In view of the above, it is an object of the embodiments of the present disclosure to provide a residual current operated protection device and a method for performing self-detection thereof, which can solve at least one or more of the above technical problems in the prior art.
According to a first aspect of the present disclosure, there is provided a residual current operated protector. The residual current operated protector may include: a residual current detection processing module configured to detect a residual current in a power supply line and generate a drive signal in response to the residual current; a trip module configured to transmit a control signal to a trip mechanism of the trip module to perform tripping in response to the driving signal; and an automatic detection module configured to, during performing the detection: sending a simulated leakage current to the residual current detection processing module and detecting a fault related to the residual current detection processing module based on a response of the residual current detection processing module to the simulated leakage current; and sending a driving signal to the trip module and detecting a fault related to the trip module based on a response of the trip module to the driving signal, wherein the driving signal and the analog leakage signal are independent of each other.
Because the analog leakage current signal for detecting the fault state of the residual current detection processing module and the driving signal for detecting the fault state of the tripping module are independent, the mutual interference between the fault detection process of the residual current detection processing module and the fault detection process of the tripping module is avoided. In particular, the residual current operated protection device according to the embodiment of the disclosure can realize protection against a type leakage.
According to an embodiment of the disclosure, the automatic detection module may be further configured to: detecting a first power supply voltage of the power supply line; and disabling the automatic detection module from performing the detection in response to the first supply voltage being below a first predetermined threshold. Therefore, the automatic detection module is forbidden to execute detection when the first power supply voltage is lower than the first preset threshold value, the leakage protection function can be still effectively executed under low voltage, and the leakage protection function of the residual current operated protector is prevented from being influenced by starting the automatic detection function.
According to an embodiment of the disclosure, the automatic detection module may be further configured to: detecting a second power supply voltage of the residual current detection processing module; and determining a power failure of the residual current detection processing module in response to determining that the second supply voltage is outside a predetermined voltage range. Therefore, the power supply fault of the residual current detection processing module can be conveniently detected.
According to one embodiment of the present disclosure, the residual current operated protector may further include an automatic trip driving module configured to drive the trip mechanism to trip in response to the second supply voltage being less than a second predetermined threshold. Therefore, when the residual current detection processing module has a power supply fault, the driving mechanism is tripped.
According to one embodiment of the present disclosure, the automatic trip driving module may include a watchdog circuit, wherein the watchdog circuit is configured to be powered based on a handle closing signal of the residual current operated protector. Therefore, automatic tripping control can be realized in a hardware mode, and the safety and the reliability of the residual current operated protector are improved. In addition, the power supply of the hardware watchdog comes from a handle closing signal, so that a lower incoming line is realized, and the output terminal can also be used as an incoming line terminal.
According to one embodiment of the present disclosure, the residual current detection processing module may include a current transformer, wherein the automatic detection module is configured to: sending a simulated leakage current to a self-checking primary coil of the current transformer; and determining a fault associated with at least one of: and the current transformer and the residual current detection processing module perform signal processing. According to one embodiment of the present disclosure, the simulated leakage current may be less than a trip threshold current of the trip mechanism. Therefore, the false tripping of the tripping mechanism during the simulation automatic test can be avoided.
According to one embodiment of the present disclosure, the trip module may include a switch driver adapted to drive the trip mechanism; wherein the auto-detection module is further configured to: determining the positive and negative of the power supply voltage of the power supply line; providing a switch control signal to the switch driver in response to the supply voltage of the power supply line being negative; and determining a fault condition of the switch driver based on a response of the switch driver to the switch control signal. Thus, the failure state of the switch driver can be detected conveniently.
According to one embodiment of the present disclosure, the residual current operated protector may further comprise an alarm, wherein the automatic detection module is further configured to: and controlling the alarm to give an alarm in response to determining that the tripping module has a fault. Therefore, the fault state of the user can be conveniently reminded through the alarm.
According to an embodiment of the disclosure, the automatic detection module may be further configured to: detecting the handle state of the residual current operated protector; and sending a signal indicating that the power supply to the tripping mechanism is cut off in response to the handle being in the opening state. Therefore, the handle can stop the power-off of the tripping mechanism when being in an off state, the reliability is improved, and the lower wire inlet function can be realized.
According to an embodiment of the present disclosure, the residual current operated protector may further include a manual detection module including a manual detection loop and a test key disposed on the detection loop, wherein the automatic detection module is configured to: and sending the second simulated leakage current to the residual current detection processing module in response to the test key being pressed to connect the manual test loop, wherein the second simulated leakage current is larger than the tripping threshold current of the tripping mechanism. Therefore, manual detection and automatic detection can be simultaneously realized in the residual current operated protector.
According to a second aspect of the present disclosure, there is provided a method for a residual current operated protector to perform self-detection. The method can comprise the following steps: sending a simulated leakage current to a residual current detection processing module of the residual current operated protector, and detecting a fault related to the residual current detection processing module based on a response of the residual current detection processing module to the simulated leakage current; and sending a drive signal to the trip module independent of the analog leakage signal, and detecting a fault associated with the trip module based on a response of the trip module to the drive signal.
According to an embodiment of the disclosure, the method may further comprise: detecting a first supply voltage of a power supply line of the residual current operated protector, and performing the self-detection in response to the first supply voltage being above a first predetermined threshold.
According to an embodiment of the disclosure, the method may further comprise: detecting a second supply voltage of the residual current detection processing module, and determining a power failure of the residual current detection processing module in response to determining that the second supply voltage is outside a predetermined voltage range.
According to one embodiment of the disclosure, the method may further comprise: and in response to the second power supply voltage being smaller than a second preset threshold value, enabling an automatic tripping driving module to drive a tripping mechanism of the tripping module to execute tripping.
According to one embodiment of the present disclosure, the automatic trip driving module may include a watchdog circuit, wherein the watchdog circuit is configured to be powered based on a handle closing signal of the residual current operated protector.
According to one embodiment of the disclosure, the method may further comprise: sending a simulated leakage current to a self-checking primary coil of a current transformer of the residual current detection processing module, and determining a fault associated with at least one of: and the current transformer and the residual current detection processing module perform signal processing.
According to an embodiment of the disclosure, the simulated leakage current may be less than a trip threshold current of a trip mechanism of the trip module.
According to an embodiment of the disclosure, the method may further comprise: determining the positive and negative of the power supply voltage of the power supply line of the residual current operated protector; providing a switch control signal to a switch driver of the trip module in response to the supply voltage of the power supply line being negative; and determining a fault condition of the switch driver based on a response of the switch driver to the switch control signal.
According to an embodiment of the disclosure, the method may further comprise: causing an alarm to issue an alarm signal in response to determining that the trip module is malfunctioning.
According to one embodiment of the disclosure, the method may further comprise: detecting the handle state of the residual current operated protector; and sending a signal indicating to disconnect power to a trip mechanism of the trip module in response to the handle being in the open state.
According to an embodiment of the present disclosure, the method may further include sending a second simulated leakage current to the residual current detection processing module in response to a test key of a manual detection module of the residual current operated protector being pressed, wherein the second simulated leakage current is greater than a trip threshold current of the trip mechanism and the manual detection module includes a manual detection loop and a test key disposed on the detection loop.
Drawings
Embodiments of the present disclosure will now be described, by way of example only, with reference to the accompanying drawings, in which:
fig. 1 shows a schematic diagram of a residual current operated protector according to an embodiment of the present disclosure;
fig. 2 illustrates a flow chart of a method for a residual current operated protector to perform self-detection according to an embodiment of the disclosure;
fig. 3 illustrates a flow diagram of a method of detecting a fault associated with a residual current detection processing module according to an embodiment of the disclosure; and
fig. 4 illustrates a flow chart of a method of detecting a fault associated with a switch driver according to an embodiment of the disclosure.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it is to be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and the embodiments of the disclosure are for illustration purposes only and are not intended to limit the scope of the disclosure.
In describing embodiments of the present disclosure, the terms "include" and "comprise," and similar language, are to be construed as open-ended, i.e., "including but not limited to. The term "based on" should be understood as "based at least in part on". The term "one embodiment" or "the embodiment" should be understood as "at least one embodiment". The terms "first," "second," and the like may refer to different or the same object. Other explicit and implicit definitions are also possible below.
Fig. 1 shows a schematic diagram of a residual current operated protector 100 according to an embodiment of the present disclosure. As shown in fig. 1, the residual current operated protector 100 may include an input terminal 101, an output terminal 102, a residual current detection processing module 110, a trip module 120, and a power module 140.
The input terminal 101 may be connected to a power supply network and the output terminal 102 may be connected to a consumer. Power from the power supply network may be connected to the consumer via the residual current operated protector 100. One of the input terminals 101 may be connected to phase or thermal power and the other terminal to neutral.
The residual current detection processing module 110 may be configured to detect a residual current in the power supply line and generate a drive signal in response to the residual current. In the illustrated embodiment, the residual current detection processing module 110 may comprise a current transformer 160, the current transformer 160 being adapted to detect a leakage current flowing from the input terminal to the output terminal, e.g. a leakage current flowing in the zero line. When the current transformer 160 senses that a leakage current exists, the current detection processing module 110 may process the detected leakage current to generate a driving signal.
The trip module 120 sends a control signal to a trip mechanism of the trip module 120 to perform a trip in response to the driving signal, thereby turning off a switch on the power supply line. In the illustrated embodiment, the dashed lines connecting the trip module 120 and the switches of the power supply lines are schematic diagrams of the trip mechanism. When the tripping mechanism acts, the contact of the driving switch performs opening or closing so as to open or close the power supply circuit.
The power module 140 may be configured to provide electrical power to the various components of the residual current device 100 to ensure proper operation of the residual current device 100. The power module 140 may provide appropriate voltages according to the voltages required for the various components to operate. In the illustrated embodiment, the power module 140 may provide 5V, 3V dc power to power the residual current detection processing module 110, the trip module 120, the automatic detection module 130, etc., it being understood that this is merely exemplary and any other suitable voltage may be provided as desired.
The residual current operated protector 100 according to the embodiment of the present disclosure may further include an automatic detection module 130. The automatic detection module 130 performs automatic detection on the residual current operated protection device 100 to detect fault conditions of various components of the residual current operated protection device 100. In some embodiments, the auto-detection module 130 may be configured to periodically perform self-detection.
The auto-detection module 130 may be configured to, during performing the detection: sending the simulated leakage current to the residual current detection processing module 110, and detecting a fault related to the residual current detection processing module 110 based on a response of the residual current detection processing module 110 to the simulated leakage current; and sending a driving signal to the trip module 120 and detecting a fault associated with the trip module 120 based on a response of the trip module 120 to the driving signal, wherein the driving signal and the analog leakage signal are independent of each other.
In the residual current operated protector 100 according to the embodiment of the present disclosure, the fault related to the residual current detection processing module 110 and the fault related to the trip module 120 are detected independently of each other, so that the application field of the residual current operated protector 100 can be widened. In particular, since the analog leakage current signal for detecting the fault state of the residual current detection processing module 110 and the driving signal for detecting the fault state of the trip module 120 are independent of each other, interference between the fault detection process of the residual current detection processing module 110 and the fault detection process of the trip module 120 is avoided.
Thus, the residual current operated protector 100 can be used for leakage protection for a-type (i.e., the power supply provides a pulsed direct current or a sinusoidal current) power consumers, and also for leakage protection for AC-type (i.e., the power supply provides a sinusoidal current) power consumers. Common type a electric devices are, for example, notebook computers, desktop computers, microwave ovens, induction cooking devices, and the like; common AC-type consumers are for example lighting, electric heaters, electric water heaters, electric kettles and the like. The residual current operated protector 100 according to the embodiment of the present disclosure can implement leakage protection for various types of electric devices.
In some embodiments, the auto-detection module 130 may be configured to: detecting a first power supply voltage of a power supply line between an input terminal 101 and an output terminal 102; and disabling the automatic detection module 130 from performing the detection in response to the first supply voltage being below a first predetermined threshold. Since the residual current operated protector 100 affects the leakage protection function of the residual current operated protector 100 itself when executing the automatic detection function, by prohibiting the automatic detection module 130 from executing the detection when the first power supply voltage is lower than the first predetermined threshold value, it can be ensured that the leakage protection function is still effective at a low voltage. In some embodiments, the first predetermined threshold may be 50V. It should be understood that this is merely exemplary, and that other suitable voltage values may be used for the first predetermined threshold, depending on the standards and legal regulations for different regions.
In some embodiments, the auto-detection module 130 may be configured to: detecting a second supply voltage of the residual current detection processing module 110; and determining a power failure of the residual current detection processing module 110 in response to determining that the second supply voltage is outside the predetermined voltage range. As mentioned above, the power module 140 supplies power to the residual current detection processing module 110. By determining the second supply voltage of the residual current detection processing module 110, faults related to the supply of power by the residual current detection processing module 110 may be identified, which may include whether the power supply wiring of the residual current detection processing module 110 is open, whether the rectifier of the power supply module is faulty, and so on. The predetermined voltage range may represent a reasonable range within which the residual current detection processing module 110 is normally powered. For example, in some embodiments, as a non-limiting example, 3-7V may be used. In some embodiments, the residual current detection processing module 110 may be implemented as an ASIC, in which case whether the power PIN connection of the ASIC is normal and/or a fault state of a rectifier bridge connected to the power PIN of the ASIC may be detected by detecting whether the voltage of the power PIN of the ASIC is a predetermined voltage (e.g., 5V in the illustrated embodiment).
In some embodiments, the tripping module 120 may be driven to trip in the event that the second supply voltage is determined to be outside of the predetermined voltage range to thereby determine a power failure of the residual current detection processing module 110. In other embodiments, the alarm 170 may be instructed to emit an alarm signal.
In some embodiments, as shown, the residual current detection processing module 110 may include a current transformer 160. The current transformer 160 may include a self-test primary coil. The auto-detection module 130 may be configured to: sending the analog leakage current to the self-checking primary coil of the current transformer 160; and determining a fault associated with at least one of: the current transformer 160 and the residual current detection processing module 110. The current transformer 160 receives the analog leakage current and converts it into a secondary-side current signal through the secondary coil, which is recognized by the residual current detection processing module 110 and generates a corresponding signal. The automatic detection module 130 detects a fault state related to the signal processing circuit of the current transformer and the residual current detection processing module 110 through the response of the residual current detection processing module 110 to the analog leakage current. In some embodiments, the simulated leakage current is less than a trip threshold current of the trip mechanism, thereby preventing the residual current operated protector 100 from actually tripping.
In some embodiments, the auto-detection module 130 may be configured to: before generating the simulated leakage current, the residual current device 100 detects whether the residual current device 100 has actually leaked electricity. If there is actual leakage, disabling the residual current device 100 from performing a self-test; thereby avoiding the leakage protection function of the residual current operated protector 100 from being affected by the execution of the self-checking function and avoiding actual leakage without tripping.
In some embodiments, trip module 120 may include a switch driver (not shown) adapted to drive the trip mechanism. In some embodiments, the switch driver may include a thyristor, which is described as an example in the following description. The fault condition of the switch driver plays an important role in the performance of the trip module 120. The residual current operated protector 100 according to the embodiment of the present disclosure can realize automatic detection of the switch driver.
The auto-detection module 130 may be further configured to: determining the positive and negative of the supply voltage of the power supply line between the input terminal 101 and the output terminal 102; providing a switch control signal to a switch driver in response to a supply voltage of the power supply line being negative; and determining a fault state of the switch driver based on a response of the switch driver to the switch control signal. In some embodiments, the auto-detection module 130 may output a high level to enable the switch driver (e.g., a thyristor) to have a forward voltage drop and simultaneously output a gate control signal to enable the thyristor, and monitor whether the anode voltage of the thyristor is pulled down, so as to determine whether the thyristor fails. It should be understood that this is merely exemplary and that other ways of implementing fault detection of the switch driver may be used.
In some embodiments, the residual current operated protector 100 may further include an automatic trip driving module 150 configured to drive the trip mechanism to trip in response to the second supply voltage being less than a second predetermined threshold. In some embodiments, the second predetermined threshold may be associated with a power down of the automatic trip drive module 150; the second predetermined threshold may be 0 or a value slightly greater than 0. Through the automatic trip driving module 150, the trip mechanism can be driven to trip when the power supply of the residual current detection processing module 110 is detected to be failed, so that the loss of protection of the power supply line due to the failure of the residual current operated protector 100 is prevented.
In some embodiments, the automatic trip drive module 150 may include a watchdog circuit configured to be powered based on a handle close signal of the residual current operated protector 100. Therefore, the tripping driving of the automatic tripping driving module can be realized in a pure hardware mode, and the automatic tripping driving module is safer and more reliable. Furthermore, the watchdog circuit is configured to be powered based on the handle close signal of the residual current operated protector 100, and therefore, even if the residual current operated protector 100 uses the output terminal 102 as an input terminal, the operation of the residual current operated protector 100 is not affected.
In some embodiments, the residual current operated protector 100 may also include an alarm 170. The auto-detection module 130 may be configured to: the alarm 170 is controlled to issue an alarm in response to determining that the trip module 120 has failed. Therefore, the tripping module 120 can be directly tripped under the condition of failure, so that a subsequent loop is disconnected, and the personal safety is protected. In some embodiments, an LED and/or buzzer alert may be used to alert the user. In some embodiments, the alarm 170 may be configured to sound an alarm in the event of detection of a failure of other components of the residual current operated protector 100.
In some embodiments, the residual current operated protector 100 may further include a manual status detection module 180. The auto-detection module 130 may be configured to: detecting the handle state of the residual current operated protector 100; and sending a signal indicating that the power supply to the tripping mechanism is cut off in response to the handle being in the opening state. Thus, the power supply of the trip mechanism can be disconnected even when the handle is in the trip position. In this case, even if the residual current device 100 uses the output terminal 102 as an input terminal, the operation of the residual current device 100 is not affected.
In some embodiments, the residual current operated protector 100 may include a manual detection module, shown in the illustrated embodiment as a test key detection module 190. The manual detection module comprises a manual detection loop and a test key arranged on the detection loop. The auto-detection module 130 is configured to: and sending a second simulated leakage current to the residual current detection processing module 110 in response to the test key being pressed to connect the manual test loop. In some embodiments, the second analog leakage current is greater than a trip threshold current of the trip mechanism. In some embodiments, once the user presses the test key, a signal is sent to the auto-detection module 130. The automatic detection module 130 applies the generated simulated leakage to the current transformer testing primary side coil, thereby implementing a testing function.
In some embodiments, the manual test and the self-test of the test key may share the primary coil of the current transformer. In some embodiments, the magnitude of the second simulated electrical leakage sent by the automatic detection module 130 under manual testing is different from the magnitude of the simulated electrical leakage sent by the automatic detection module 130 under automatic testing. In some embodiments, the magnitude of the simulated leakage sent by the automatic detection module 130 under manual testing can reach a trip threshold of the product, thereby causing the product to trip. The simulated leakage must be less than the product trip threshold value under automatic testing to avoid product tripping.
Fig. 2 illustrates a flow chart of a method 200 for a residual current operated protector to perform self-detection according to an embodiment of the disclosure. The method illustrated in fig. 2 may be implemented in, for example, the auto-detection module 130.
As shown in fig. 2, the method for the residual current operated protector 100 to perform self-detection may include the following steps. At 202, the analog leakage current is sent to the residual current detection processing module 110 of the residual current operated protector 100, and a fault associated with the residual current detection processing module 110 is detected based on a response of the residual current detection processing module 110 to the analog leakage current. At 204, a drive signal independent of the analog leakage signal is sent to the trip module 120, and a fault associated with the trip module 120 is detected based on a response of the trip module 120 to the drive signal.
In some embodiments, the method may further comprise: detecting a first supply voltage of a supply line of the residual current operated protector 100, and performing a self-detection in response to the first supply voltage being higher than a first predetermined threshold.
In some embodiments, the method may further comprise: detecting a second supply voltage of the residual current detection processing module 110, and determining a power failure of the residual current detection processing module 110 in response to determining that the second supply voltage is outside the predetermined voltage range. In some embodiments, the method may further comprise: in response to the second supply voltage being less than the second predetermined threshold, the trip mechanism of the trip module 120 is driven to trip. In some embodiments, the automatic trip drive module 150 includes a watchdog circuit configured to be powered based on a handle close signal of the residual current operated protector 100.
Fig. 3 illustrates a flow diagram of a method 300 of detecting a fault associated with a residual current detection processing module according to an embodiment of the present disclosure. In the method 300, at 302, the analog leakage current is sent to the self-test primary coil of the current transformer 160 of the residual current detection processing module 110. At 304, a fault associated with at least one of the following is determined based on a response of the residual current detection processing module 110 to the simulated leakage current: the current transformer 160 and the residual current detection processing module 110. In some embodiments, the simulated leakage current is less than a trip threshold current of a trip mechanism of the trip module 120.
Fig. 4 illustrates a flow chart of a method 400 of detecting a fault associated with a switch driver in accordance with an embodiment of the disclosure. In method 400, at 402, the positivity or negativity of the supply voltage of the power supply line of the residual current operated protector 100 is determined; at 404, a switch control signal is provided to a switch driver of the trip module in response to the supply voltage of the power supply line being negative. At 406, a fault condition of the switch driver is determined based on the response of the switch driver to the switch control signal.
In some embodiments, the method may further comprise: the alarm is caused to issue an alarm signal in response to determining that the trip module 120 is malfunctioning.
In some embodiments, the method may further comprise: detecting the handle state of the residual current operated protector 100; and in response to the handle being in the tripped state, send a signal indicating to turn off power to the trip mechanism of the trip module 120.
In some embodiments, the method may further comprise: sending a simulated leakage current to the residual current detection processing module 110 in response to the test key of the manual detection module of the residual current operated protector 100 being pressed, where the second simulated leakage current is greater than the trip threshold current of the trip mechanism; the manual detection module comprises a manual detection loop and a test key arranged on the detection loop.
The functions described herein above may be performed, at least in part, by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), an Application Specific Standard Product (ASSP), a system on a chip (SOC), a load programmable logic device (CPLD), and the like.
Program code for implementing the methods of the present disclosure may be written in any combination of one or more programming languages. Further, while operations are depicted in a particular order, this should be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. Under certain circumstances, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are included in the above discussion, these should not be construed as limitations on the scope of the disclosure. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single implementation. Conversely, various features that are described in the context of a single implementation can also be implemented in multiple implementations separately or in any suitable subcombination.
Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.
Claims (22)
1. A residual current operated protector (100) comprising:
a residual current detection processing module (110) configured to detect a residual current in a power supply line and generate a drive signal in response to the residual current;
a trip module (120) configured to transmit a control signal to a trip mechanism of the trip module (120) to perform tripping in response to the driving signal; and
an automatic detection module (130) configured to, during performing the detection:
-sending a simulated leakage current to the residual current detection processing module (110) and detecting a fault related to the residual current detection processing module (110) based on a response of the residual current detection processing module (110) to the simulated leakage current; and
sending a drive signal to the trip module (120), and detecting a fault associated with the trip module (120) based on a response of the trip module (120) to the drive signal, wherein the drive signal and the analog leakage signal are independent of each other.
2. The residual current operated protector (100) according to claim 1, wherein the automatic detection module (130) is further configured to:
detecting a first power supply voltage of the power supply line; and
disabling the automatic detection module (130) from performing the detection in response to the first supply voltage being below a first predetermined threshold.
3. The residual current operated protector (100) according to claim 2, wherein the automatic detection module (130) is further configured to:
detecting a second supply voltage of the residual current detection processing module (110); and
determining a power failure of the residual current detection processing module (110) in response to determining that the second supply voltage is outside a predetermined voltage range.
4. The residual current operated protector (100) of claim 3, further comprising an automatic trip driving module (150) configured to drive the trip mechanism to trip in response to the second supply voltage being less than a second predetermined threshold.
5. The residual current operated protector (100) of claim 4, wherein the automatic trip drive module (150) comprises a watchdog circuit, wherein the watchdog circuit is configured to be powered based on a handle close signal of the residual current operated protector (100).
6. The residual current operated protector (100) according to any one of claims 1-5, wherein the residual current detection processing module (110) comprises a current transformer (160),
wherein the automatic detection module (130) is configured to:
sending a simulated leakage current to a self-test primary coil of the current transformer (160); and
determining a fault associated with at least one of: and signal processing of the current transformer (160) and the residual current detection processing module (110).
7. The residual current operated protector (100) according to claim 6, wherein the simulated leakage current is less than a trip threshold current of the trip mechanism.
8. The residual current operated protector (100) according to any one of claims 1-5 and 7, wherein the trip module (120) comprises a switch driver adapted to drive the trip mechanism;
wherein the automatic detection module (130) is further configured to:
determining the positive and negative of the power supply voltage of the power supply line;
providing a switch control signal to the switch driver in response to the supply voltage of the power supply line being negative; and
Determining a fault condition of the switch driver based on a response of the switch driver to the switch control signal.
9. The residual current operated protector (100) according to any one of claims 1-5 and 7, further comprising an alarm (170),
wherein the automatic detection module (130) is further configured to: controlling the alarm (170) to issue an alarm in response to determining that the trip module (120) is malfunctioning.
10. The residual current operated protector (100) according to any one of claims 1-5 and 7, wherein the automatic detection module (130) is further configured to:
detecting a handle state of the residual current operated protector (100); and
and sending a signal indicating that the power supply to the tripping mechanism is cut off in response to the handle being in the opening state.
11. The residual current operated protector (100) according to any one of claims 1-5 and 7, further comprising a manual detection module comprising a manual detection circuit and a test key provided on said detection circuit,
wherein the automatic detection module (130) is configured to: sending a second simulated leakage current to the residual current detection processing module (110) in response to the test key being pressed to close the manual test loop, wherein the second simulated leakage current is greater than a trip threshold current of the trip mechanism.
12. A method for a residual current operated protector (100) to perform self-detection, comprising:
sending a simulated leakage current to a residual current detection processing module (110) of the residual current operated protector (100) and detecting a fault associated with the residual current detection processing module (110) based on a response of the residual current detection processing module (110) to the simulated leakage current; and
sending a drive signal to the trip module (120) independent of the analog leakage signal, and detecting a fault associated with the trip module (120) based on a response of the trip module (120) to the drive signal.
13. The method of claim 12, further comprising:
detecting a first supply voltage of a supply line of the residual current operated protector (100), an
Performing the self-detection in response to the first supply voltage being above a first predetermined threshold.
14. The method of claim 13, further comprising:
detecting a second supply voltage of the residual current detection processing module (110), an
Determining a power failure of the residual current detection processing module (110) in response to determining that the second supply voltage is outside a predetermined voltage range.
15. The method of claim 14, further comprising:
and in response to the second power supply voltage being smaller than a second preset threshold value, the automatic tripping driving module (150) is enabled to drive the tripping mechanism of the tripping module (120) to execute tripping.
16. The method of claim 15, wherein the automatic trip drive module (150) includes a watchdog circuit, wherein the watchdog circuit is configured to be powered based on a handle close signal of the residual current operated protector (100).
17. The method according to any one of claims 12-16, further including:
sending a simulated leakage current to a self-test primary coil of a current transformer (160) of the residual current detection processing module (110), an
Determining a fault associated with at least one of: and signal processing of the current transformer (160) and the residual current detection processing module (110).
18. The method of claim 17, wherein the simulated leakage current is less than a trip threshold current of a trip mechanism of the trip module (120).
19. The method of any of claims 12-16 and 18, further comprising:
Determining the positive and negative of the power supply voltage of the power supply line of the residual current operated protector (100);
providing a switch control signal to a switch driver of the trip module in response to the supply voltage of the power supply line being negative; and
determining a fault condition of the switch driver based on a response of the switch driver to the switch control signal.
20. The method according to any one of claims 12-16 and 18, further including:
causing an alarm to issue an alarm signal in response to determining that the trip module (120) is malfunctioning.
21. The method of any of claims 12-16 and 18, further comprising:
detecting the handle state of the residual current operated protector (100); and
in response to the handle being in an open state, a signal is issued indicating to disconnect power to a trip mechanism of the trip module (120).
22. The method of any of claims 12-16 and 18, further comprising
Sending a second simulated leakage current to the residual current detection processing module (110) in response to a test key of a manual detection module of the residual current operated protector (100) being pressed, wherein the second simulated leakage current is larger than a tripping threshold current of the tripping mechanism, and the manual detection module comprises a manual detection loop and a test key arranged on the detection loop.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110038029.9A CN114759521A (en) | 2021-01-12 | 2021-01-12 | Residual current operated protector and method for executing self-detection thereof |
| GB2200280.2A GB2603854B (en) | 2021-01-12 | 2022-01-11 | Residual current device and self-testing method for the same |
| AU2022200162A AU2022200162B2 (en) | 2021-01-12 | 2022-01-12 | Residual current device and self-testing method for the same |
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| CN202110038029.9A CN114759521A (en) | 2021-01-12 | 2021-01-12 | Residual current operated protector and method for executing self-detection thereof |
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| CN114759521A true CN114759521A (en) | 2022-07-15 |
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| CN202110038029.9A Pending CN114759521A (en) | 2021-01-12 | 2021-01-12 | Residual current operated protector and method for executing self-detection thereof |
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| CN (1) | CN114759521A (en) |
| AU (1) | AU2022200162B2 (en) |
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| CN117393387B (en) * | 2023-10-20 | 2024-04-19 | 浙江卓瑞微智能制造有限公司 | Household intelligent circuit breaking protection device |
| CN117955046B (en) * | 2024-03-26 | 2024-06-11 | 锦浪科技股份有限公司 | Method for inhibiting tripping of leakage current protector |
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| US7149065B2 (en) * | 2003-06-16 | 2006-12-12 | Hubbell Incorporated | Self testing digital fault interrupter |
| GB2521188A (en) * | 2013-12-12 | 2015-06-17 | Eaton Ind Netherlands Bv | Alternating current circuit breaker with self-test capability |
| CN111192801B (en) * | 2015-11-03 | 2022-12-13 | 豪倍公司 | Ground fault circuit interrupter using frequency identification and measurement |
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| AU2022200162B2 (en) | 2023-05-11 |
| GB2603854A (en) | 2022-08-17 |
| AU2022200162A1 (en) | 2022-07-28 |
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