CN105675966A - Fault arc detection method based on difference calculation and protection device thereof - Google Patents
Fault arc detection method based on difference calculation and protection device thereof Download PDFInfo
- Publication number
- CN105675966A CN105675966A CN201610016192.4A CN201610016192A CN105675966A CN 105675966 A CN105675966 A CN 105675966A CN 201610016192 A CN201610016192 A CN 201610016192A CN 105675966 A CN105675966 A CN 105675966A
- Authority
- CN
- China
- Prior art keywords
- power
- electrical signal
- load
- power end
- detection unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention relates to a fault arc detection method based on difference calculation and a protection device thereof. Compared with the prior art, the method solves the defects of different types of AC power supply systems and DC power supply systems, such as serial connection fault arcs, parallel connection fault arcs, electric shock of human bodies, and abnormal discharge of power loops, while the defects are difficult to detect accurately. The method comprises the following steps: confirming a normal state; monitoring operation and assuming a fault state; and comparing a normal state electronic signal difference value and a fault state electronic signal difference value. If the difference is greater than a preset threshold, the method determines that a fault arc exists. The method can effectively detects serial connection fault arcs, parallel connection fault arcs, electric shock of human bodies, abnormal discharge of power loops and the like of different types of AC power supply systems and DC power supply systems.
Description
Technical field
The present invention relates to the detection of the fault electric arc of AC power supply system and DC power system and human electric shock's detection and resist technology field, specifically a kind of fault arc detection method based on mathematic interpolation and protection device thereof.
Background technology
Fault electric arc be electrical fire act primarily as because of. At present, all kinds of alternating current arc detection techniques are all based on the current waveform of fault electric arc or the feature of voltage waveform, carry out detecting in characteristic frequency section and identify; And all kinds of nonlinear load has extremely complex electric current and voltage fundamental and harmonic wave, it is difficult to the waveform with fault electric arc and distinguishes. Unidirectional current does not have the waveform of zero crossing, fault electric arc and load to be difficult to compartment analysis especially. Fault electric arc based on current waveform or voltage waveform detects analysis, the problem that substantially cannot solve erroneous judgement.
Get an electric shock and be divided into the live wire of electrical network alternating current power supply to pass through human body to ground discharge, or constituted the discharge loop of power supply by human body. When exchange live wire constitutes loop with the earth, can determine whether leak current fault by the current differential of detection live wire with zero line. And between the live wire of alternating current power supply and between live wire and zero line, constitute fault loop, and the both positive and negative polarity of DC source constitutes fault loop, effectively detection and Reasonable Protection are a difficult problem all the time.
How effectively to detect all kinds of series fault arc and parallel arc fault, and human electric shock and electric power loop paradoxical discharge, and protection in time and reporting to the police, be related to the safety and stablization operation of personal safety, equipment and device, communal facility.
Summary of the invention
The invention aims to solve all kinds of AC power supply systems and the series fault arc of DC power system, parallel arc fault, human electric shock and electric power loop paradoxical discharge in prior art and be difficult to the defect of accurately detection, it is provided that a kind of fault arc detection method based on mathematic interpolation and protection device thereof solve the problems referred to above. And the function such as overcurrent protection and exchange live wire earth leakage protection can be increased, it is achieved more complete power-supply system protection and warning function.
To achieve these goals, technical scheme is as follows:
A kind of fault arc detection method based on mathematic interpolation, including power end, load end, for detecting the power end electrical signal detection unit of power end electric power numerical value and for detecting the load end electrical signal detection unit of load end electric power numerical value, described fault arc detection method comprises the following steps:
Confirm normal condition, power end electrical signal detection unit and load end electrical signal detection unit calculate the normal condition value of electrical signals of power end and the normal condition value of electrical signals of load end respectively, and two values are sought difference operation, obtain normal condition signal of telecommunication difference;
Monitoring runs and assumes malfunction, power end electrical signal detection unit and load end electrical signal detection unit calculate the malfunction value of electrical signals of power end and the malfunction value of electrical signals of load end respectively, and two values are sought difference operation, obtain malfunction signal of telecommunication difference;
Normal condition signal of telecommunication difference and malfunction signal of telecommunication difference are compared, if beyond setting threshold value, then judges that fault electric arc exists.
Confirm normal condition, described power end electrical signal detection unit detection normal condition power end magnitude of voltage, described load end electrical signal detection unit detection normal condition load terminal voltage value, and calculate the normal condition voltage difference of power end and load end;
Monitoring runs and assumes malfunction, power end electrical signal detection unit detection malfunction power end magnitude of voltage, load end electrical signal detection unit detection malfunction load terminal voltage value, and calculates the malfunction voltage difference of power end and load end;
Normal of-state voltage difference and malfunction voltage difference are compared, beyond setting threshold value, then judges that fault electric arc exists.
Confirm normal condition, described power end electrical signal detection unit detection normal condition power end current value, described load end electrical signal detection unit detection normal condition load end current value, and calculate the normal condition current differential of power end and load end;
Monitoring runs and assumes malfunction, power end electrical signal detection unit detection malfunction power end current value, load end electrical signal detection unit detection malfunction load end current value, and calculates the malfunction current differential of power end and load end;
Normal state current difference is compared with malfunction current differential, beyond setting threshold value, then judges that fault electric arc exists or human electric shock or electric power loop paradoxical discharge occur.
Confirm normal condition: the power end calculated by power end electrical signal detection unit and load end electrical signal detection unit and the normal condition signal of telecommunication difference of load end, derive normal condition resistance value;
Monitoring runs and assumes malfunction: the power end calculated by power end electrical signal detection unit and load end electrical signal detection unit and the malfunction signal of telecommunication difference of load end, derives malfunction resistance value;
Normal state impedance value is compared with malfunction resistance value, and beyond setting threshold value, then failure judgement electric arc exists or human electric shock or electric power loop paradoxical discharge occurs.
Described power end electrical signal detection unit detection power end magnitude of voltage, described load end electrical signal detection unit detection load terminal voltage value; Power end magnitude of voltage compares in real time with load terminal voltage value, beyond setting threshold value, then judges that fault electric arc exists; Or power end magnitude of voltage repeatedly compares with load terminal voltage value all beyond setting threshold value, then it is judged to malfunction.
Described power end electrical signal detection unit detection power end current value, described load end electrical signal detection unit detection load end current value; Power end current value compares in real time with load end current value, beyond setting threshold value, then judges that fault electric arc exists, or human electric shock and electric power loop paradoxical discharge occur; Or power end current value repeatedly compares beyond setting threshold value with load end current value, then it is judged to malfunction.
Described power end electrical signal detection unit detects power end current value and magnitude of voltage and phase contrast, derives power end resistance value;Described load end electrical signal detection unit detects load end current value and magnitude of voltage and phase contrast, derives load end resistance value; Power end resistance value compares in real time with load end resistance value, beyond setting threshold value, then judges that malfunction exists; Or power end resistance value repeatedly compares with load end resistance value all beyond setting threshold value, then it is judged to malfunction.
When fault electric arc existence or human electric shock, turn off the operation of power end, disconnecting consumers end or deenergization end and load end loop.
Described power end includes some class alternating current power supplys and DC source, electromotor, energy storage device, solar photovoltaic power and supply convertor; Load end includes some class supply convertors, energy storage device and load device.
Power end electrical signal detection unit detection power end magnitude of voltage and current value, or detect magnitude of voltage and the current value at any node place between power end and load end; Load end electrical signal detection unit detection load terminal voltage value and current value, or detect magnitude of voltage and the current value at any node place between load end and power end.
When power end is multiple power sources in series, detects magnitude of voltage and the current value of each power supply respectively, or directly detect magnitude of voltage and the current value of total series-connection power supplies; When load end is multiple load in series, detects magnitude of voltage and the current value of each load respectively, or directly detect magnitude of voltage and the current value of total series load.
Power end electrical signal detection unit and load end electrical signal detection unit are integrated in a device, or are encapsulated in two independent devices, or integrated with power end device or integrated with load end device or integrated with other device.
Power end electrical signal detection unit is inserted directly between power end and load end, or connects the magnitude of voltage of power end and the detection node of current value with cable; Load end electrical signal detection unit is inserted directly between load end and power end, or connects the magnitude of voltage of load end and the detection node of current value with cable.
When power end electrical signal detection unit and load end electrical signal detection unit are independent device, mutual communication mode is that communication cable connects communication, power line carrier communication, radio communication, infrared communication, optic communication, photoelectric coupling communication or undesirable mutual electromagnetic inductance communication.
When fault electric arc existence or human electric shock, the loop of deenergization end or disconnecting consumers end or deenergization end and load end; The protection device disconnected is chopper, relay, catalyst, electrical switch, electrical switch in parallel or mechanical switch.
When power end electrical signal detection unit is integrated with power end device, the device of power end device is utilized to complete detection and the function of protection.
When load end electrical signal detection unit is integrated with load end device, the device of load end device is utilized to complete detection and the function of protection.
Beneficial effect
A kind of fault arc detection method based on mathematic interpolation of the present invention and protection device thereof, compared with prior art realize effectively detecting all kinds of AC power supply system and the series fault arc of DC power system, parallel arc fault, human electric shock and electric power loop paradoxical discharge etc. And the function such as overcurrent protection and exchange live wire earth leakage protection can be increased, it is achieved more complete power-supply system protection and warning function. Can be used for detecting serial arc, parallel arc, human electric shock, the detection of abnormity of power supply electric discharge and the device of protection and technology.
Accompanying drawing explanation
Fig. 1 is the system block diagram of the fault arc detection method in the present invention based on mathematic interpolation;
Fig. 2 is the schematic block circuit diagram of power end electrical signal detection device;
Fig. 3 is the schematic block circuit diagram of load end electrical signal detection device;
Fig. 4 is the schematic block circuit diagram of integrated power end electrical signal detection device and load end electrical signal detection device;
Fig. 5 is the system block diagram of the power end electrical signal detection device of series connection;
Fig. 6 is the system block diagram of the load end electrical signal detection device of series connection;
Wherein, (1) power end, (2) load end; (3) power end electrical signal detection unit, (4) load end electrical signal detection unit, (5) microprocessor; (6) voltage sensor, (7) current sensor, (8) telecommunication circuit; (9) power circuit; (10) communication cable, (11) measures cable, (12) protects device; (13) series fault arc, (14) parallel arc fault.
Detailed description of the invention
For making the architectural feature to the present invention and effect of reaching have a better understanding and awareness, coordinate detailed description in order to preferred embodiment and accompanying drawing, illustrate as follows:
Cathode drop and lonely post pressure drop and anode drop is there is in the present invention based on arc region, parallel arc fault and human electric shock and electric power loop paradoxical discharge can cause that power end current value and load end current value exist the phenomenon of difference, detect series fault arc and parallel arc fault and the fault such as human electric shock and electric power loop paradoxical discharge.
As it is shown in figure 1, the method for mathematic interpolation fault electric arc and human electric shock has following 6 kinds (all can be used alone or combination in any uses):
1, described power end electrical signal detection unit 3 detects power end 1 magnitude of voltage; Described load end electrical signal detection unit 4 detects load end 2 magnitude of voltage. Confirm the normal condition of power-supply system, calculate the normal condition voltage difference of power end 1 and load end 2; The monitoring of power-supply system runs, and calculates the power end 1 voltage difference with load end 2 in real time as monitoring voltage difference. Normal condition voltage difference and monitoring voltage difference comparsion, beyond setting threshold value, then judge that fault electric arc exists. Or normal condition voltage difference repeatedly compares beyond setting threshold value with monitoring voltage difference, then it is judged to fault electric arc state.
2, described power end electrical signal detection unit 3 detects power end 1 current value; Described load end electrical signal detection unit 4 detects load end 2 current value. Confirm the normal condition of power-supply system, calculate the normal condition current differential of power end 1 and load end 2; The monitoring of power-supply system runs, and calculates the power end 1 current differential with load end 2 in real time as monitoring current difference. Normal condition current differential and monitoring current difference comparsion, beyond setting threshold value, then judge that parallel arc fault 14 exists, or human electric shock and electric power loop paradoxical discharge occur. Or normal condition current differential repeatedly compares beyond setting threshold value with monitoring current difference, then it is judged to malfunction.
3, described power end electrical signal detection unit 3 detects power end 1 current value and magnitude of voltage and phase contrast; Described load end electrical signal detection unit 4 detects load end 2 current value and magnitude of voltage and phase contrast. Confirm the normal condition of power-supply system, calculate the normal condition signal of telecommunication difference of power end 1 and load end 2, derive the normal condition resistance value of electric power loop; The monitoring of power-supply system runs, and calculates the signal of telecommunication difference of power end 1 and load end 2 in real time, derives the monitoring resistance value of electric power loop. Normal condition resistance value compares with monitoring resistance value, and beyond setting threshold value, then failure judgement state exists.Or normal condition resistance value repeatedly compares beyond setting threshold value with monitoring resistance value, then it is judged to malfunction.
4, described power end electrical signal detection unit 3 detects power end 1 magnitude of voltage; Described load end electrical signal detection unit 4 detects load end 2 magnitude of voltage. Power end magnitude of voltage compares in real time with load terminal voltage value, beyond setting threshold value, then judges that fault electric arc exists. Or power end magnitude of voltage repeatedly compares beyond setting threshold value with load terminal voltage value, then it is judged to malfunction.
5, described power end electrical signal detection unit 3 detects power end 1 current value; Described load end electrical signal detection unit 4 detects load end 2 current value. Power end current value compares in real time with load end current value, beyond setting threshold value, then judges that fault electric arc exists, or human electric shock and electric power loop paradoxical discharge occur. Or power end current value repeatedly compares beyond setting threshold value with load end current value, then it is judged to malfunction.
6, described power end electrical signal detection unit 3 detects power end 1 current value and magnitude of voltage and phase contrast, derives power end resistance value; Described load end electrical signal detection unit 4 detects load end 2 current value and magnitude of voltage and phase contrast, derives load end resistance value. Power end resistance value compares in real time with load end resistance value, beyond setting threshold value, then judges that malfunction exists. Or power end resistance value repeatedly compares beyond setting threshold value with load end resistance value, then it is judged to malfunction.
Confirm that the normal condition of power-supply system has manual confirmation and automatically confirms that both of which: manual confirmation is to be confirmed by modes such as button or system program softwares. Automatically confirm that it is by judging that whether the power end 1 voltage difference with load end 2 is beyond setting threshold value; Or judge that whether the power end 1 current differential with load end 2 is beyond setting threshold value; Or judge whether the impedance differences of power end 1 and load end 2 confirms beyond the mode setting threshold value. Manual confirmation pattern and the pattern that automatically confirms that can be combined and use or be used alone one way in which.
The in real time electric current of monitoring power end 1 and load end 2 and voltage and impedance, it may be achieved power-supply system is monitored from the overall process starting to closedown and controls. And first confirm the voltage and current of power end 1 and load end 2 normal condition and the difference of impedance and store, calculate power end and the voltage and current of load end and the difference of impedance in real time and compared, accurately can quickly detect fault electric arc and the human electric shock of power-supply system. Two kinds of detection mode combinations use: before confirming normal condition, monitor the difference change of the power end 1 electric current with load end 2 and voltage and impedance in real time, send fault-signal and starting protection during fault; After confirming normal condition, to the detection acknowledging time of malfunction and improve Detection accuracy by accelerating system.
Detection unit and device can set up fault test button.
Detection unit and device can set up failure reset button.
Restarting for system after avoiding malfunction protection, detection unit and device need manually to restart or system software controls is restarted.
Power end 1 includes all kinds of alternating current power supply and DC source, electromotor, energy storage device, solar photovoltaic power, supply convertor etc.; Load end 2 includes all kinds of supply convertor, energy storage device, load device etc.
Power end electrical signal detection unit 3 detects power end 1 magnitude of voltage and current value, or detects magnitude of voltage and the current value at any node place between power end 1 and load end 2;Load end electrical signal detection unit 4 detects load end 2 magnitude of voltage and current value, or detects magnitude of voltage and the current value at any node place between load end 2 and power end 1.
When power end 1 is multiple power sources in series: detected magnitude of voltage and the current value of each power supply, serial communication between power end electrical signal detection unit 3 by multiple power end electrical signal detection unit 3 respectively, then communicate with other devices; Or magnitude of voltage and the current value of total series-connection power supplies is directly detected by power end electrical signal detection unit 3.
When load end 2 is multiple power sources in series: detected magnitude of voltage and the current value of each load, serial communication between load end electrical signal detection unit 4 by multiple load end electrical signal detection unit 4 respectively, then communicate with other devices; Or magnitude of voltage and the current value of total series load is directly detected by load end electrical signal detection unit 4.
Power end electrical signal detection unit 3 and load end electrical signal detection unit 4 can an integrated device or two independent devices or integrated with power end device or integrated with load end device or integrated with other device.
Power end electrical signal detection unit 3 can be integrated with photovoltaic component terminal box or accumulator; Load end electrical signal detection unit 4 can be integrated with inverter or converter.
Power end electrical signal detection unit 3 is inserted directly between power end and load end, or connects the magnitude of voltage of power end and the detection node of current value with cable; Load end electrical signal detection unit 4 is inserted directly between load end and power end, or connects the magnitude of voltage of load end and the detection node of current value with cable.
When power end electrical signal detection unit 3 and load end electrical signal detection unit 4 are independent device, mutual communication mode includes communication cable and connects communication, power line carrier communication, radio communication, infrared communication, optic communication, photoelectric coupling communication, undesirable mutual electromagnetic inductance communication etc.
When fault electric arc existence or human electric shock, the loop of deenergization end 1 or deenergization end 1 and load end 2; The protection device that can disconnect includes chopper, relay, catalyst, electrical switch, electrical switch in parallel and mechanical switch etc.; Concurrently be out of order information.
When power end electrical signal detection unit 3 is integrated with power end device, it is possible to use the device of power end device completes detection and the function of protection.
When load end electrical signal detection unit 4 is integrated with load end device, it is possible to use the device of load end device completes detection and the function of protection.
Power end electrical signal detection unit 3 and load end electrical signal detection unit 4, adopt current sensor 7 and voltage sensor 6, detect the signal of telecommunication such as electric current and voltage. The signal of telecommunication is transmitted by microprocessor 5 and is processed.
Current sensor 7 and voltage sensor 6 may select the bulk resistor etc. of resistance, transformer, Hall element, components and parts.
The case study on implementation of the present invention is as follows:
1, power end electrical signal detection device
Fault electric arc detection technique as shown in Figure 2 and electric shock detection technique and protection, including power end 1, microprocessor 5, voltage sensor 6, current sensor 7, telecommunication circuit 8, power circuit 9. The interface circuit of microprocessor 5 is connected with voltage sensor 6 and current sensor 7, the signal of telecommunication such as voltage and electric current of detecting power end 1, by telecommunication circuit 9, the signal of telecommunication is sent to load end electrical signal detection device. Power circuit 9 provides the working power needed to microprocessor 5 device such as grade.
When power end electrical signal detection device is as being designed with defencive function, its signal of telecommunication with the load end electrical signal detection device received compares, and exists higher than setting threshold value then failure judgement electric arc.During fault, microprocessor 5 controls the loop of protection device open failure electric arc; Or send the shutoff of signal control power supply end device.
Series fault arc 13 detection voltage, when not needing parallel arc fault 14 and human electric shock and electric power loop paradoxical discharge detection function, may select need not current detecting components and parts. Parallel arc fault 14 and human electric shock and electric power loop paradoxical discharge need detection voltage and current.
Connected mode has two kinds: plug-in type has power end interface and load end interface. Cable type connects measurement node by measuring cable 11.
Communication mode: include communication cable and connect the modes such as communication, power line carrier communication, radio communication, infrared communication, optic communication, undesirable mutual electromagnetic inductance communication.
Protected mode: the protection device 12 that can disconnect includes chopper, relay, catalyst, electrical switch, electrical switch in parallel and mechanical switch etc.; And send fault message.
Voltage and current sensor may select: resistance, transformer, Hall element, components and parts bulk resistor etc.
2, load end electrical signal detection device
Fault electric arc detection technique as shown in Figure 3 and electric shock detection technique and protection, including power end 1, microprocessor 5, voltage sensor 6, current sensor 7, telecommunication circuit 8, power circuit 9. The interface circuit of microprocessor 5 is connected with voltage sensor 6 and current sensor 7, the signal of telecommunication such as voltage and electric current of detecting load end 2, by telecommunication circuit 8, the signal of telecommunication is sent to power end electrical signal detection device. Power circuit 9 provides the working power needed to microprocessor 5 device such as grade.
When load end electrical signal detection device is as being designed with defencive function, its signal of telecommunication with the power end electrical signal detection device received compares, and exists higher than setting threshold value then failure judgement electric arc. During fault, microprocessor 5 controls the loop of protection device 12 open failure electric arc; Or send signal control load end device shutoff.
When load is accumulator, load end electrical signal detection device and charger communication, compare signal of telecommunication difference, it is judged that whether fault electric arc exists the loop then controlling protection device open failure electric arc if any fault electric arc; Or send signal control charger shutoff.
Series fault arc 13 detection voltage, when not needing parallel arc fault 14 and human electric shock and electric power loop paradoxical discharge detection function, may select need not current detecting components and parts. Parallel arc fault 14 and human electric shock and electric power loop paradoxical discharge need detection voltage and current.
Connected mode has two kinds: plug-in type has power end interface and load end interface. Cable type connects measurement node by measuring cable.
Communication mode: include communication cable and connect the modes such as communication, power line carrier communication, radio communication, infrared communication, optic communication, undesirable mutual electromagnetic inductance communication.
Protected mode: the protection device 12 that can disconnect includes chopper, relay, catalyst, electrical switch, electrical switch in parallel and mechanical switch etc.; And send fault message.
Voltage and current sensor may select: resistance, transformer, Hall element, components and parts bulk resistor etc.
3, integrated power end electrical signal detection device and load end electrical signal detection device
Fault electric arc detection technique as shown in Figure 4 and electric shock detection technique and protection, including power end 1, microprocessor 5, two-way voltage sensor 6, two-way current sensor 7, power circuit 9.The interface circuit of microprocessor 5 is connected with voltage sensor 6 and current sensor 7, detects the signal of telecommunication such as voltage and current of power end 1 and load end 2 respectively, and power circuit 9 provides the working power needed to microprocessor 5 device such as grade. The load end signal of telecommunication and the power end signal of telecommunication compare, and exist higher than setting threshold value then failure judgement electric arc. There is the loop of microprocessor 5 control protection device 12 open failure electric arc during fault; Or send signal control load end device shutoff; Or send the shutoff of signal control power supply end device.
The device of unprotect function, during fault, microprocessor 5 sends alarm control signal, and sends protection control signal to outside.
Connected mode has two kinds: plug-in type has power end interface and load end interface, and another is measured node and connects by measuring cable. Cable type connects the measurement node of power end 1 and load end 2 respectively by measuring cable.
Series fault arc 13 detection voltage, when not needing parallel arc fault 12 and human electric shock and electric power loop paradoxical discharge detection function, may select need not current detecting components and parts. Parallel arc fault 12 and human electric shock and electric power loop paradoxical discharge need detection voltage and current.
Communication mode: include communication cable and connect the modes such as communication, power line carrier communication, radio communication, infrared communication, optic communication, undesirable mutual electromagnetic inductance communication.
Protected mode: the protection device 14 that can disconnect includes chopper, relay, catalyst, electrical switch, electrical switch in parallel and mechanical switch etc.; And send fault message.
Voltage and current sensor may select: resistance, transformer, Hall element, components and parts bulk resistor etc.
4, the power end electrical signal detection device of series connection
Fault electric arc detection technique as shown in Figure 5 and electric shock detection technique and protection, including the power end 1 of series connection, microprocessor 5, voltage sensor 6, current sensor 7, telecommunication circuit 8, power circuit 9. The interface circuit of microprocessor 5 is connected with voltage sensor 6 and current sensor 7, the signal of telecommunication such as voltage and current detecting corresponding power end 1. By telecommunication circuit 8, the signal of telecommunication is sent to adjacent power end electrical signal detection device; Or it is sent to load end electrical signal detection device. Power circuit provides the working power needed to microprocessor 5 device such as grade.
When power end electrical signal detection device is as being designed with defencive function, it compares with the signal of telecommunication received, and exists higher than setting threshold value then failure judgement electric arc. During fault, microprocessor 5 controls the loop of protection device 12 open failure electric arc; Or send signal control load end device shutoff.
Power end 1 photovoltaic module in this way of series connection, then power end electrical signal detection device may select in the rosette being embedded into photovoltaic module; Load end electrical signal detection device is optional to be embedded in inverter.
The accumulator of power end 1 electric automobile in this way of series connection, then load end electrical signal detection device is optional is embedded in converter.
Series fault arc 13 detection voltage, when not needing parallel arc fault 14 and human electric shock and electric power loop paradoxical discharge detection function, may select need not current detecting components and parts. Parallel arc fault 14 and human electric shock and electric power loop paradoxical discharge need detection voltage and current.
Connected mode has two kinds: plug-in type has power end interface. Cable type connects measurement node by measuring cable.
Communication mode: include communication cable and connect the modes such as communication, power line carrier communication, radio communication, infrared communication, optic communication, undesirable mutual electromagnetic inductance communication.
Protected mode: the protection device 12 that can disconnect includes chopper, relay, catalyst, electrical switch, electrical switch in parallel and mechanical switch etc.; And send fault message.
Voltage and current sensor may select: resistance, transformer, Hall element, components and parts bulk resistor etc.
5, the load end electrical signal detection device of series connection
Fault electric arc detection technique as shown in Figure 6 and electric shock detection technique and protection, including the load end 2 of series connection, microprocessor 5, voltage sensor 6, current sensor 7, telecommunication circuit 8, power circuit 9. The interface circuit of microprocessor 5 is connected with voltage sensor 6 and current sensor 7, detects the signal of telecommunication such as voltage and current of corresponding load end 2; By telecommunication circuit 7, the signal of telecommunication is sent to adjacent load end electrical signal detection device, or is sent to power end electrical signal detection device. Power circuit provides the working power needed to microprocessor 5 device such as grade.
When load end electrical signal detection device is as being designed with defencive function, it compares with the signal of telecommunication received, and exists higher than setting threshold value then failure judgement electric arc. During fault, microprocessor 5 controls the loop of protection device 12 open failure electric arc; Or send the shutoff of signal control power supply end device.
Series fault arc 13 detection voltage, when not needing parallel arc fault 14 and human electric shock and electric power loop paradoxical discharge detection function, may select need not current detecting components and parts. Parallel arc fault 14 and human electric shock and electric power loop paradoxical discharge need detection voltage and current.
Connected mode has two kinds: plug-in type has load end interface. Cable type connects measurement node by measuring cable.
Communication mode: include communication cable and connect the modes such as communication, power line carrier communication, radio communication, infrared communication, optic communication, undesirable mutual electromagnetic inductance communication.
Protected mode: the protection device 12 that can disconnect includes chopper, relay, catalyst, electrical switch, electrical switch in parallel and mechanical switch etc.; And send fault message.
Voltage and current sensor may select: resistance, transformer, Hall element, components and parts bulk resistor etc.
The ultimate principle of the present invention, principal character and advantages of the present invention have more than been shown and described. Skilled person will appreciate that of the industry; the present invention is not restricted to the described embodiments; simply principles of the invention described in above-described embodiment and description; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements both fall within claimed the scope of the present invention. The protection domain of application claims is defined by appending claims and equivalent thereof.
Claims (17)
1. the fault arc detection method based on mathematic interpolation, including power end (1), load end (2), it is used for detecting power end electrical signal detection unit (3) of power end electric power numerical value and for detecting load end electrical signal detection unit (4) of load end electric power numerical value, it is characterized in that, described fault arc detection method comprises the following steps:
11) normal condition is confirmed, power end electrical signal detection unit (3) and load end electrical signal detection unit (4) calculate the normal condition value of electrical signals of power end (1) and the normal condition value of electrical signals of load end (2) respectively, and two values are sought difference operation, obtain normal condition signal of telecommunication difference;
12) monitoring runs and assumes malfunction, power end electrical signal detection unit (3) and load end electrical signal detection unit (4) calculate the malfunction value of electrical signals of power end (1) and the malfunction value of electrical signals of load end (2) respectively, and two values are sought difference operation, obtain malfunction signal of telecommunication difference;
13) normal condition signal of telecommunication difference and malfunction signal of telecommunication difference are compared, if beyond setting threshold value, then judge that fault electric arc exists.
2. a kind of fault arc detection method based on mathematic interpolation according to claim 1, it is characterised in that:
21) normal condition is confirmed, described power end electrical signal detection unit (3) detection normal condition power end magnitude of voltage, described load end electrical signal detection unit (4) detection normal condition load terminal voltage value, and calculate the normal condition voltage difference of power end (1) and load end (2);
22) monitoring runs and assumes malfunction, power end electrical signal detection unit (3) detection malfunction power end magnitude of voltage, load end electrical signal detection unit (4) detection malfunction load terminal voltage value, and calculate the malfunction voltage difference of power end (1) and load end (2);
23) normal of-state voltage difference and malfunction voltage difference are compared, beyond setting threshold value, then judge that fault electric arc exists.
3. a kind of fault arc detection method based on mathematic interpolation according to claim 1, it is characterised in that:
31) normal condition is confirmed, described power end electrical signal detection unit (3) detection normal condition power end current value, described load end electrical signal detection unit (4) detection normal condition load end current value, and calculate the normal condition current differential of power end (1) and load end (2);
32) monitoring runs and assumes malfunction, power end electrical signal detection unit (3) detection malfunction power end current value, load end electrical signal detection unit (4) detection malfunction load end current value, and calculate the malfunction current differential of power end (1) and load end (2);
33) normal state current difference is compared with malfunction current differential, beyond setting threshold value, then judge that fault electric arc exists or human electric shock or electric power loop paradoxical discharge occur.
4. a kind of fault arc detection method based on mathematic interpolation according to claim 1, it is characterised in that:
41) confirmation normal condition, the power end (1) calculated by power end electrical signal detection unit (3) and load end electrical signal detection unit (4) and the normal condition signal of telecommunication difference of load end (2), derive normal condition resistance value;
42) monitoring runs and assumes malfunction, the malfunction signal of telecommunication difference of the power end (1) calculated by power end electrical signal detection unit (3) and load end electrical signal detection unit (4) and load end (2), derivation malfunction resistance value;
43) normal state impedance value being compared with malfunction resistance value, beyond setting threshold value, then failure judgement electric arc exists or human electric shock or electric power loop paradoxical discharge occurs.
5. a kind of fault arc detection method based on mathematic interpolation according to claim 2, it is characterized in that: described power end electrical signal detection unit (3) detection power end magnitude of voltage, described load end electrical signal detection unit (4) detection load terminal voltage value; Power end (1) magnitude of voltage compares in real time with load end (2) magnitude of voltage, beyond setting threshold value, then judges that fault electric arc exists; Or power end (1) magnitude of voltage repeatedly compares with load end (2) magnitude of voltage all beyond setting threshold value, then it is judged to malfunction.
6. a kind of fault arc detection method based on mathematic interpolation according to claim 3, it is characterized in that: described power end electrical signal detection unit (3) detection power end current value, described load end electrical signal detection unit (4) detection load end current value;Power end (1) current value compares in real time with load end (2) current value, beyond setting threshold value, then judges that fault electric arc exists, or human electric shock and electric power loop paradoxical discharge occur; Or power end (1) current value repeatedly compares beyond setting threshold value with load end (2) current value, then it is judged to malfunction.
7. a kind of fault arc detection method based on mathematic interpolation according to claim 4, it is characterised in that: described power end electrical signal detection unit (3) detects power end (1) current value and magnitude of voltage and phase contrast, derives power end resistance value; Described load end electrical signal detection unit (4) detects load end (2) current value and magnitude of voltage and phase contrast, derives load end resistance value; Power end resistance value compares in real time with load end resistance value, beyond setting threshold value, then judges that malfunction exists; Or power end resistance value repeatedly compares with load end resistance value all beyond setting threshold value, then it is judged to malfunction.
8. a kind of fault arc detection method based on mathematic interpolation according to any one in claim 1-7, it is characterized in that: when fault electric arc existence or human electric shock, turn off the operation of power end (1), disconnecting consumers end (2) or deenergization end (1) and load end (2) loop.
9. the protection device of a kind of fault arc detection method based on mathematic interpolation according to any one in claim 1-7, it is characterised in that: described power end (1) includes some class alternating current power supplys and DC source, electromotor, energy storage device, solar photovoltaic power and supply convertor; Load end (2) includes some class supply convertors, energy storage device and load device.
10. the protection device of a kind of fault arc detection method based on mathematic interpolation according to any one in claim 1-7, it is characterized in that: power end electrical signal detection unit (3) detection power end (1) magnitude of voltage and current value, or detect magnitude of voltage and the current value at any node place between power end (1) and load end (2); Load end electrical signal detection unit (4) detection load end (2) magnitude of voltage and current value, or detect magnitude of voltage and the current value at any node place between load end (2) and power end (1).
11. the protection device of a kind of fault arc detection method based on mathematic interpolation according to any one in claim 1-7, it is characterized in that: when power end (1) is for several power sources in series, detect magnitude of voltage and the current value of each power supply respectively, or directly detect magnitude of voltage and the current value of total series-connection power supplies; When load end (2) is for several load in series, detects magnitude of voltage and the current value of each load respectively, or directly detect magnitude of voltage and the current value of total series load.
12. the protection device of a kind of fault arc detection method based on mathematic interpolation according to any one in claim 1-7; it is characterized in that: power end electrical signal detection unit (3) and load end electrical signal detection unit (4) are integrated in a device; or it is encapsulated in two independent devices; or it is integrated with power end (1) device; or it is integrated with load end (2) device or integrated with other device.
13. the protection device of a kind of fault arc detection method based on mathematic interpolation according to any one in claim 1-7, it is characterized in that: power end electrical signal detection unit (3) is inserted directly between power end (1) and load end (2), or connect the magnitude of voltage of power end (1) and the detection node of current value with cable;Load end electrical signal detection unit (4) is inserted directly between load end (2) and power end (1), or connects the magnitude of voltage of load end (2) and the detection node of current value with cable.
14. the protection device of a kind of fault arc detection method based on mathematic interpolation according to any one in claim 1-7; it is characterized in that: when power end electrical signal detection unit (3) and load end electrical signal detection unit (4) are for independent device, mutual communication mode is that communication cable connects communication, power line carrier communication, radio communication, infrared communication, optic communication, photoelectric coupling communication or undesirable mutual electromagnetic inductance communication.
15. the protection device of a kind of fault arc detection method based on mathematic interpolation according to any one in claim 1-7, it is characterized in that: when fault electric arc existence or human electric shock, the loop of deenergization end (1) or disconnecting consumers end (2) or deenergization end (1) and load end (2); The protection device disconnected is chopper, relay, catalyst, electrical switch, electrical switch in parallel or mechanical switch.
16. the protection device of a kind of fault arc detection method based on mathematic interpolation mode according to any one in claim 1-7; it is characterized in that: when power end electrical signal detection unit (3) is integrated with power end (1) device, utilize the device of power end device to complete detection and the function of protection.
17. the protection device of a kind of fault arc detection method based on mathematic interpolation according to any one in claim 1-7; it is characterized in that: when load end electrical signal detection unit (4) is integrated with load end (2) device, utilize the device of load end device to complete detection and the function of protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610016192.4A CN105675966B (en) | 2016-01-08 | 2016-01-08 | A kind of fault arc detection method and its protective device based on difference calculation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610016192.4A CN105675966B (en) | 2016-01-08 | 2016-01-08 | A kind of fault arc detection method and its protective device based on difference calculation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105675966A true CN105675966A (en) | 2016-06-15 |
| CN105675966B CN105675966B (en) | 2019-03-22 |
Family
ID=56299992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610016192.4A Active CN105675966B (en) | 2016-01-08 | 2016-01-08 | A kind of fault arc detection method and its protective device based on difference calculation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105675966B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106054009A (en) * | 2016-08-19 | 2016-10-26 | 广东美的制冷设备有限公司 | Household electrical appliance and fault arc detection device and method used therefor |
| WO2018032652A1 (en) * | 2016-08-19 | 2018-02-22 | 广东美的制冷设备有限公司 | Household appliance, and arc fault detection device and method therefor |
| CN112014701A (en) * | 2020-08-31 | 2020-12-01 | 许昌智普新能源科技有限公司 | Direct current arc detection method of direct current system |
| US10996284B2 (en) | 2016-07-01 | 2021-05-04 | Huawei Technologies Co., Ltd. | Noise generation circuit, self-checking circuit, AFCI, and photovoltaic power generation system |
| CN113240876A (en) * | 2021-04-22 | 2021-08-10 | 姜玥 | Low-voltage power transmission wire and cable fire prevention and monitoring method |
| CN113702739A (en) * | 2021-08-26 | 2021-11-26 | 广东电网有限责任公司 | Electric arc detection method and device based on wavelet decomposition and neural network |
| CN114523850A (en) * | 2021-12-23 | 2022-05-24 | 大连理工江苏研究院有限公司 | Electric spark fault alarm and alarm method for electric vehicle direct current power supply system |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100085206A1 (en) * | 2008-10-08 | 2010-04-08 | Siemens Industry, Inc. | Visual Indication of Fault Status, Storage and Clearance in an Arc Fault Circuit Interrupter (AFCI) |
| US20100103568A1 (en) * | 2008-10-24 | 2010-04-29 | Jun Bae Lee | Afci device |
| CN101925828A (en) * | 2008-01-24 | 2010-12-22 | 西门子工业公司 | Method and apparatus for testing AFCI device for series arc detection |
| CN103913663A (en) * | 2014-04-21 | 2014-07-09 | 南京航空航天大学 | Online detection method and protection device for direct current system arc faults |
| CN104360205A (en) * | 2014-12-01 | 2015-02-18 | 河北工业大学 | Cascaded arc fault detection method and special device for cascaded arc fault detection method |
| CN104515933A (en) * | 2014-12-12 | 2015-04-15 | 国家电网公司 | Leak current fault detecting method and device |
| CN104635133A (en) * | 2015-03-14 | 2015-05-20 | 北京芯同汇科技有限公司 | Novel fault arc detection method and device |
| CN104953546A (en) * | 2015-06-25 | 2015-09-30 | 安徽长远绿色能源有限公司 | Protection detection device for photovoltaic assembly or power system as well as control method of protection detection device |
| CN104979797A (en) * | 2014-04-02 | 2015-10-14 | 海尔集团公司 | Electric leakage protecting device with arc detection function, and electric power consumption equipment |
-
2016
- 2016-01-08 CN CN201610016192.4A patent/CN105675966B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101925828A (en) * | 2008-01-24 | 2010-12-22 | 西门子工业公司 | Method and apparatus for testing AFCI device for series arc detection |
| US20100085206A1 (en) * | 2008-10-08 | 2010-04-08 | Siemens Industry, Inc. | Visual Indication of Fault Status, Storage and Clearance in an Arc Fault Circuit Interrupter (AFCI) |
| US20100103568A1 (en) * | 2008-10-24 | 2010-04-29 | Jun Bae Lee | Afci device |
| CN104979797A (en) * | 2014-04-02 | 2015-10-14 | 海尔集团公司 | Electric leakage protecting device with arc detection function, and electric power consumption equipment |
| CN103913663A (en) * | 2014-04-21 | 2014-07-09 | 南京航空航天大学 | Online detection method and protection device for direct current system arc faults |
| CN104360205A (en) * | 2014-12-01 | 2015-02-18 | 河北工业大学 | Cascaded arc fault detection method and special device for cascaded arc fault detection method |
| CN104515933A (en) * | 2014-12-12 | 2015-04-15 | 国家电网公司 | Leak current fault detecting method and device |
| CN104635133A (en) * | 2015-03-14 | 2015-05-20 | 北京芯同汇科技有限公司 | Novel fault arc detection method and device |
| CN104953546A (en) * | 2015-06-25 | 2015-09-30 | 安徽长远绿色能源有限公司 | Protection detection device for photovoltaic assembly or power system as well as control method of protection detection device |
Non-Patent Citations (2)
| Title |
|---|
| 徐秦乐 等: "高精度故障电弧检测多传感器数据融合算法", 《上海大学学报（自然科学版）》 * |
| 董爱华 等: "低压配电箱故障电弧信号在线检测与报警系统", 《电测与仪表》 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10996284B2 (en) | 2016-07-01 | 2021-05-04 | Huawei Technologies Co., Ltd. | Noise generation circuit, self-checking circuit, AFCI, and photovoltaic power generation system |
| CN106054009A (en) * | 2016-08-19 | 2016-10-26 | 广东美的制冷设备有限公司 | Household electrical appliance and fault arc detection device and method used therefor |
| WO2018032652A1 (en) * | 2016-08-19 | 2018-02-22 | 广东美的制冷设备有限公司 | Household appliance, and arc fault detection device and method therefor |
| CN106054009B (en) * | 2016-08-19 | 2019-01-29 | 广东美的制冷设备有限公司 | Household appliance and fault arc detection device and method for it |
| US11444443B2 (en) | 2016-08-19 | 2022-09-13 | Gd Midea Air-Conditioning Equipment Co., Ltd. | Household appliance and apparatus and method for detecting arc fault in the same |
| CN112014701A (en) * | 2020-08-31 | 2020-12-01 | 许昌智普新能源科技有限公司 | Direct current arc detection method of direct current system |
| CN113240876A (en) * | 2021-04-22 | 2021-08-10 | 姜玥 | Low-voltage power transmission wire and cable fire prevention and monitoring method |
| CN113702739A (en) * | 2021-08-26 | 2021-11-26 | 广东电网有限责任公司 | Electric arc detection method and device based on wavelet decomposition and neural network |
| CN114523850A (en) * | 2021-12-23 | 2022-05-24 | 大连理工江苏研究院有限公司 | Electric spark fault alarm and alarm method for electric vehicle direct current power supply system |
| CN114523850B (en) * | 2021-12-23 | 2024-04-16 | 大连理工江苏研究院有限公司 | Electric spark fault alarm and alarm method for electric vehicle direct-current power supply system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105675966B (en) | 2019-03-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105675966A (en) | Fault arc detection method based on difference calculation and protection device thereof | |
| CN202533545U (en) | Power transmission network fault detection system based on internet of things technology | |
| US20090287430A1 (en) | System and Method for Detecting Leak Current | |
| CN103983857A (en) | Direct current insulation monitoring circuit and method | |
| CN204129120U (en) | A kind of lightning monitoring system | |
| CN206313534U (en) | Bar rack type becomes radio station monitoring device | |
| EP2645512A1 (en) | Faulty protective earth ground circuit detection system and method | |
| CN104459367A (en) | Electrical control and protection device | |
| CN103675705A (en) | Method for redundancy check of currents of power battery | |
| CN201528224U (en) | High-tension line electrified detecting and locking device | |
| CN102944804A (en) | Overhead line fault detection system | |
| CN103018621A (en) | Direct current insulation monitoring module based on 24V power system and achieving method thereof | |
| JP2018506016A (en) | Load side voltage detection for utility meters | |
| CN201242583Y (en) | Electrical leakage detection device | |
| CN210129032U (en) | Device for on-line monitoring fault of current transformer | |
| CN207457417U (en) | A kind of Simple Substation dc bus insulation monitoring device | |
| CN103001282A (en) | Charge variable current protector | |
| CN103595264B (en) | There is the high frequency electric source of site manual operation system | |
| CN109270356B (en) | Intelligent monitoring device for grounding impedance of transformer substation grounding point and instrument control method | |
| CN103123378B (en) | Electric fault spark method of real-time and device | |
| CN105044519B (en) | A kind of transforming plant DC interconnection, mixed on-line identification method | |
| CN204374371U (en) | A kind of D.C. isolation monitoring device detects the failure alarm circuit of electric bridge | |
| CN101345408A (en) | Method for assigning a residual current to one of the three phase currents of a three-phase system and residual current protection switch | |
| CN107807585A (en) | A kind of power equipment monitoring system | |
| CN103116108B (en) | Intelligent detector for direct-current power supply system of transformer substation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201104 Address after: 230000 D10, Swan Lake community, administrative district, Hefei City, Anhui Province Patentee after: Yu Xiaodong Address before: Acacia road 230088 high tech Zone in Hefei City, Anhui province No. 16 days Yue new century business center 5 Building 2 layer Patentee before: ANHUI CHANGYUAN GREEN ENERGY Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230602 Address after: 311400 Room 1213, Floor 12, Building 13, Fuchun Park, Zhigu, China, Yinhu Street, Fuyang District, Hangzhou, Zhejiang Patentee after: Hangzhou Hankeshen Technology Co.,Ltd. Address before: 230000 Tian'ehupan Community, Hefei Administrative District, Anhui Province D10 Patentee before: Yu Xiaodong |