CN107505544B - Microprocessor-based arc alarm without external power supply - Google Patents
Microprocessor-based arc alarm without external power supply Download PDFInfo
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- CN107505544B CN107505544B CN201710692729.3A CN201710692729A CN107505544B CN 107505544 B CN107505544 B CN 107505544B CN 201710692729 A CN201710692729 A CN 201710692729A CN 107505544 B CN107505544 B CN 107505544B
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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Abstract
The invention provides a microprocessor-based arc alarm without external power supply, which comprises: the system comprises a non-power consumption electric arc detection unit, a microprocessor, an alarm and a power supply unit, wherein the non-power consumption electric arc detection unit comprises at least one group of detection loops and at least one switch unit, when each group of detection loops can drive the corresponding switch unit to be conducted and output a pulse signal, the detection of the electric arc signal is judged, and the output pulse signal is sent to the microprocessor; the microprocessor is used for receiving the pulse signals and counting the number of the pulses so as to judge whether the arc fault is detected; the alarm receives an alarm instruction from the microprocessor and sends an arc alarm signal according to the alarm instruction so as to prompt a user. The invention can monitor the arc fault of the AC power supply loop without external power supply and wiring and send out an alarm signal.
Description
Technical Field
The invention relates to the technical field of arc monitoring, in particular to an arc alarm without external power supply based on a microprocessor.
Background
In the Chinese fire cause analysis, the fire caused by electrical causes accounts for more than 30%.
The reasons for the occurrence of electrical fire are many, short circuit, insulation aging, overcurrent, ground fault, poor contact, ignition of combustible materials by household appliances or electric heating equipment, and the like. Essentially, during all electrical fires, an arc occurs.
In the united states, based on the statistics of CPSC (american consumer safety commission) 1998, there are more than 40000 fires annually due to arcs caused by distribution line aging, resulting in a direct economic loss of $ 16.8 billion.
At present, an arc fault circuit breaker exists, and a function of protecting a fault arc is added on the basis of a traditional circuit breaker so as to prevent a fire caused by the fault arc. However, the existing arc fault circuit breakers are prone to malfunction in some application scenarios, and directly trip, which may affect normal production and life, and the existing arc fault protection is generally installed on a local separate load, such as an air conditioner.
In addition, the installation of the existing arc fault circuit breaker needs power failure, belongs to facilities installed in advance, and no facilities exist in a large number of occasions. The occurrence of electric arc does not always cause fire, if the power supply of the whole family or room is tripped just because one socket is loosened, the power failure range is enlarged, and the production and the life are seriously influenced. In most practical applications, only an alarm is needed to remind the user.
At present, arc fault circuit breakers or alarm devices in the market are required to be connected, power failure installation is required, and the limitation is brought to installers. Also, existing arc fault circuit breakers or alarms require power.
Disclosure of Invention
The object of the present invention is to solve at least one of the technical drawbacks mentioned.
To this end, it is an object of the present invention to provide a microprocessor-based arc alarm without external power supply.
To achieve the above object, an embodiment of the present invention provides a microprocessor-based arc alarm without external power supply, including:
the system comprises a non-power consumption electric arc detection unit, a microprocessor, an alarm and a power supply unit, wherein the microprocessor is connected with the non-power consumption electric arc detection unit and the alarm, and the power supply unit is connected with the non-power consumption electric arc detection unit, the microprocessor and the alarm;
the non-power consumption arc detection unit comprises at least one group of detection loops and at least one switch unit, when an arc fault occurs, because the current under the arc fault has a large high-frequency component, the voltage induced by each group of detection loops can drive the corresponding switch unit to be conducted, when a pulse signal is output, the arc signal is judged to be detected, and the output pulse signal is sent to the microprocessor;
the microprocessor is used for receiving the pulse signals and counting the number of pulses to judge whether the arc fault is detected, and the method comprises the following steps: within a preset time, if the number of pulses is between a first threshold value and a second threshold value, judging that an arc fault is detected, and sending an alarm instruction to the alarm; if the number of pulses is less than the first threshold value, judging that no arc fault exists; if the number of the pulses is larger than the second threshold value, the interference signals are judged to be continuous, and the arc faults are avoided;
the alarm receives an alarm instruction from the microprocessor and sends an arc alarm signal according to the alarm instruction so as to prompt a user;
the energy collecting and current detecting unit is used for collecting energy from the current transformer, supplying the collected energy to the power supply unit, the alarm, the non-power consumption arc detecting unit and the microprocessor, and detecting the current value of a user load.
Further, the alarm comprises an alarm unit and a wireless signal transmitting unit,
the wireless signal transmitting unit receives an alarm instruction from the microprocessor and performs alarm processing;
the alarm unit sends an arc alarm signal according to the alarm instruction, wherein the arc alarm signal adopts at least one of the following forms: sound, light, vibration, unmodulated radio signals, modulated radio signals.
Further, the wireless signal transmitter adopts a wireless communication mode of one of the following forms: zigbee, loran, LoRaWAN, NBIOT.
Further, the at least one group of detection loops comprises at least one detection coil, and each detection coil adopts an air-core coil without a magnetic core or a coil with a magnetic core.
Further, the switch unit adopts a low-threshold MOS tube or triode or an ultra-low power consumption integrated circuit.
Further, still include: the environment parameter detecting unit, the environment parameter detecting unit with energy is gathered and current detection unit with microprocessor connects for detect the temperature and humidity data in the environment, when detecting one of following condition, judges the block terminal trouble, the notice the alarm sends alarm signal:
the environment temperature exceeds a set value, the environment humidity exceeds a set value, and the user load current exceeds a set value for a preset duration.
Furthermore, the microprocessor is also used for controlling the starting alarm to send out an alarm signal when the energy collecting and current detecting unit detects that the load current exceeds a set value and lasts for a long time, and meanwhile, the wireless signal transmitting unit of the alarm sends a wireless alarm signal to the central control room;
when the environmental parameter detection unit detects one of the following conditions, the control starts the alarm to send out an alarm signal, and simultaneously, the wireless signal transmitting unit of the alarm sends a wireless alarm signal to the central control room: the environment temperature exceeds a set value, and the duration time exceeds the set value; the ambient humidity exceeds the set value and the duration exceeds the set value.
Further, a wireless signal transmitter in the alarm is also used for sending the detected load current and the temperature and humidity information of the environment where the load current is located in a timing mode.
Further, the alarm and the monitoring loop adopt a buckle installation mode, a fastening body is opened, the alarm is sleeved on the monitoring loop, and then the fastening body is closed, so that the circuit transformer and the detection coil are all sleeved on the detection loop.
Further, the fastening body is a buckle or a screw or a snap spring.
Furthermore, the energy collecting and current detecting unit is connected with a current transformer, a power supply unit, the non-power consumption arc detecting unit, a microprocessor and an alarm,
the energy collecting and current detecting unit is used for collecting energy from the current transformer, supplying the collected energy to the power supply unit, the alarm, the non-power consumption arc detecting unit and the microprocessor, and detecting the current value of a user load.
According to the microprocessor-based arc alarm without external power supply provided by the embodiment of the invention, at least one group of detection loops in the arc detection unit without power consumption are adopted to detect whether an arc fault occurs, and the energy acquisition circuit is adopted to provide the energy acquired from the current transformer to the rechargeable battery or the super capacitor, so that the arc fault of the alternating current power supply loop can be monitored without external power supply and wiring, and sound or other alarm information is sent out. The invention can be widely applied to the occasions of arc fault alarm, distribution box overheating alarm, cable joint overheating alarm, cable trench temperature alarm and the like.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block diagram of a microprocessor-based unpowered arc alarm in accordance with an embodiment of the invention;
FIGS. 2a and 2b are schematic views of the installation of an alarm according to an embodiment of the invention;
FIG. 3 is a circuit diagram of a non-power consuming arc detection unit according to an embodiment of the present invention;
FIG. 4 is a circuit diagram of an energy collection and current detection unit according to an embodiment of the present invention;
FIG. 5 is a circuit diagram of a temperature and humidity monitoring unit according to an embodiment of the present invention;
fig. 6 is a block diagram of a microprocessor-based unpowered arc alarm in accordance with an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 1, a microprocessor-based arc alarm without external power supply according to an embodiment of the present invention includes: the arc detection device comprises a non-power consumption arc detection unit 1 (comprising a detection coil), a microprocessor 2, an alarm 42 and a power supply unit 6. Fig. 1 is a schematic diagram of the detection coil and the current transformer core after being closed.
Specifically, the microprocessor 2 is connected with the non-power consumption arc detecting unit 1 and the alarm 42.
The non-power consumption arc detection unit 1 comprises at least one group of detection loops and at least one switch unit, when an arc fault occurs, because the current under the arc fault has a large high-frequency component, the voltage induced by each group of detection loops can drive the corresponding switch unit to be conducted, when a pulse signal is output, the arc signal is judged to be detected, and the output pulse signal is sent to the microprocessor 2. In one embodiment of the invention, the switching unit adopts a low-threshold MOS tube or triode or an ultra-low power consumption integrated circuit.
In an embodiment of the present invention, at least one set of detection loops includes at least one detection coil or at least one detection coil and an equal number of external capacitors, and specifically includes the following three cases:
(1)1 detection coil
(2)1 detection coil +1 capacitor
The combination of 1 coil and 1 coil +1 capacitor in (1) and (2) above is determined by software count comparison, considering that an arc fault is possible as long as the switching means can be driven.
(3) Two or more detection coils + equal-number capacitors or two or more detection coils + unequal-number capacitors
The combination of two or more detection coils and capacitors with the same quantity or the combination of two or more detection coils and capacitors with unequal quantities considers that the arc fault is possible only by driving all switch units, and the arc fault is judged by counting and comparing through software.
Specifically, in order to better distinguish a normal grid interference signal from a fault arc signal, at least one group of detection loops is adopted and comprises at least two detection coils and an equal number of external capacitors, each detection coil adopts an air core coil without a magnetic core or a coil with the magnetic core, and the magnetic permeability mu of the magnetic core is less than 2000.
The principle of arc detection is described below with reference to three forms of the detection loop:
first, the output voltage of the detection coil of the detection loop, which is fitted over the subscriber line, is proportional to the current and frequency values it detects. Since the power signal is generally a low-frequency sine wave signal, the voltage value that can be output on the detection circuit is very low, which is not enough to drive the switch unit to conduct. However, the fault arc signal contains a large high-frequency signal, the voltage output of the detection coil is in a proportional relation with the frequency of the signal, a large voltage value can be output on the high-frequency signal, and the switching unit can be driven. In one embodiment of the present invention, it has been experimentally found that the voltage that can be output on a high frequency signal may exceed 1V.
If the detection loop is a single coil, the output voltage of the detection coil can drive the switch unit to be conducted, and then the possibility of an arc fault is considered. If the detection loop is a single coil or a detection loop formed by the single coil and the capacitor, only the output voltage of the detection loop can drive the switch unit to be conducted, and then the possibility of arc fault is considered to occur; if two or more detection loops are adopted, only the output voltages of the detection loops can drive the switch unit to be conducted, and the possibility of arc faults is considered.
When no arc signal exists, the standby power consumption is very close to 0 microwatt, and the standby current is the leakage current of a triode or a low-threshold MOS tube. If 2 or more detection loops are adopted, the resonance point frequency of a group of detection loops formed by each detection coil and an externally connected capacitor is not in integral multiple relation, and at least one loop detects the arc signal by adopting the following mode: each group of detection loops can drive the corresponding switch unit to be conducted, when pulse signals are output, arc signals are judged to be detected, and only when each detection loop is output by the pulses, the arc signals are judged to be the arc signals.
As shown in fig. 3, the subscriber line to be detected passes through each detection coil, and the induced voltage of the line fault arc signal on the detection coil directly or indirectly drives a low-threshold MOS transistor or a triode or an ultra-low power consumption integrated circuit, so as to start the power supply of the microprocessor 2 and also monitor the arc signal.
Specifically, the detection coil 1 and the external capacitor 1 form a group of detection loops for driving the connected low-threshold MOS transistor or triode or ultra-low power consumption integrated circuit to be turned on or off. The detection coil 2 and the external capacitor 2 form another group of detection loops for driving the connected low-threshold MOS tube or triode to be switched on and off.
The following working principle for the non-power consuming arc detection unit 1:
when an arc occurs in the subscriber line, a high frequency pulse is generated. Wherein the high frequency signal is at least 10 times higher than the power frequency 50HZ,60HZ or the intermediate frequency 400HZ, 800 HZ.
The induction voltage on each detection coil can directly or indirectly trigger the corresponding low-threshold MOS tube or make the triode circuit be conducted, so that a monostable circuit is started to supply power to the microprocessor 2, and simultaneously, the monostable circuit is also sent to the pulse detection counting circuit of the microprocessor 2 to carry out pulse counting. Taking two detection loops as an example, the two detection loops and the two capacitors form a non-integral multiple of resonance frequency, arc signals with different frequencies can be selected, and only if the two detection loops can trigger the low-threshold MOS tube or make the triode circuit be conducted, the arc signals are considered to be the arc signals needing to be detected. Other conditions are filtered out, and detection and alarm are not carried out, so that the power consumption of the system can be reduced.
The microprocessor 2 is normally in a power-off state, and when the arc detection circuit is triggered, the circuit of the microprocessor 2 works to run an internally programmed program to count the number of pulses of the arc detection circuit. Specifically, the microprocessor 2 receives the pulse signal and counts the number of pulses to determine whether an arc fault is detected, including: within the preset time, if the number of pulses is between the first threshold and the second threshold, it is determined that an arc fault is detected, an alarm instruction is sent to the alarm 42, and meanwhile, a wireless signal transmitter in the alarm 42 sends a wireless alarm signal to a central control room. The microprocessor 2 detects the number of pulses of arc discharge at a given time thereafter until no arc fault is detected, and then stops the emission of the audible alarm signal and the wireless alarm signal and disconnects its own power supply. The alarm 42 is normally in a non-powered state, and gives an alarm signal under the control of the pin of the microprocessor 2 to remind a user of the existence of arc discharge in the circuit, and the user manually inquires where the arc discharge point exists. For example, the alarm 42 may be an audible alarm 42, which sounds an alarm in the form of a buzzer or the like.
Preferably, the preset time period may be 200 milliseconds.
If the number of the pulses is smaller than a first threshold value, judging that no arc fault exists, and judging that the arc fault is a normal arc such as switch closing; if the number of the pulses is larger than the second threshold value, the continuous interference signals and non-arc faults are judged, such as normal arcs of continuous arc loads such as a direct current brush motor. For example, the first threshold is 5, and the second threshold is 1000.
The alarm 42 receives an alarm command from the microprocessor 2 and issues an arc alarm signal according to the alarm command to prompt a user. In one embodiment of the present invention, the alarm 42 includes an alarm unit and a wireless signal transmitting unit 41,
the wireless signal transmitting unit 41 receives the alarm instruction from the microprocessor 2 and performs alarm processing. Wherein, the wireless signal transmitter adopts one of the following wireless communication modes: zigbee, LoRa, LoRaWAN, NBIOT and other wireless communication modes.
The wireless signal transmitter adopts ZIGBEE, LORA, LORAWAN or other wireless communication modes, needs to be configured with a center, receives wireless alarm information and carries out alarm processing. The alarm device is mainly suitable for occasions where no person is on the alarm site.
The alarm unit sends one or more arc alarm signals according to the alarm command, and the arc alarm signals adopt at least one of the following forms: sound, light, vibration, unmodulated radio signals, modulated radio signals.
In one embodiment of the present invention, when the alarm unit is an audible alarm 42, it includes: the peripheral driving circuit, the piezoelectric ceramic alarm 42 and the corresponding resonant cavity are formed, the input and output pins of the microprocessor 2 are used for providing high level, the alarm 42 is electrified, and the alarm 42 sounds. The low level alarm 42 is powered off, the alarm 42 does not sound, and no power is consumed.
As shown in fig. 6, the energy collecting and current detecting unit 3 is connected to the current transformer 7, the power supply unit 6, the non-power consumption arc detecting unit 1 (including the detecting coil 8), the microprocessor 2 and the alarm 42. The energy collecting and current detecting unit 3 is used for collecting energy from the current transformer, supplying the collected energy to the power supply unit 6, the alarm 42, the non-power consumption arc detecting unit 1 and the microprocessor 2, and detecting the current value of the user load.
Specifically, as shown in fig. 4, the energy collecting and current detecting unit 3 collects energy from the current transformer, and induces energy at the secondary side of the current transformer by the load current of the user to charge the power supply unit 6, so that the whole alarm 42 can work normally without external power supply; and a power supply unit 6 monitoring function is provided, and a sound alarm signal is sent out to prompt a user to replace or maintain under the condition that the voltage of the power supply unit 6 is low or the fault condition occurs.
The power supply unit 6 is connected with the non-power consumption arc detection unit 1, the microprocessor 2, the alarm 42, the energy collecting and current detection unit 3, the environmental parameter detection unit 5 and the like so as to supply power to the devices.
In one embodiment of the present invention, the power supply unit 6 may be a non-rechargeable battery, a rechargeable battery, or a super capacitor.
When no user load exists and the energy collecting circuit does not work, the alarm 42 and the microprocessor 2 can be powered by the power supply unit 6, so that the normal work of the alarm and the microprocessor can be ensured.
And the energy collecting/current detecting unit 3 collects energy from the output of the current transformer and supplies power to the power supply unit 6. And detects the subscriber line operating current.
Referring to fig. 4, the output of the current transformer is rectified and filtered by the rectifier bridge and then supplied to the energy collecting circuit, and the power supply unit 6 is supplied with power by the energy collecting circuit. The transformer ratio of CT is very large, such as 2000: 1, the mutual inductor can output higher voltage, and can make the rectifier bridge conduct. Under a load condition of 0.5A, it is possible to output about 1v of about 0.25mA, about 0.25mw of power, which is sufficient to charge the power supply unit 6 considering a level of standby power consumption of less than 10uW, and many energy-collecting integrated circuits are now available. Under the condition of larger load current, the output power is larger. The long-term stable operation of the alarm 42 can be ensured. The circuit is also responsible for the detection of current, measures the voltage at two ends of the detection resistor R2 through the AD input of the microprocessor 2, and obtains the current value of the user load through software calculation.
Further, as shown in fig. 5, the arc alarm 42 without external power supply based on the microprocessor 2 according to the embodiment of the present invention further includes: environmental parameter detecting element 5, environmental parameter detecting element 5 is connected with energy collection and current detection unit 3 and microprocessor 2 for temperature and humidity data in the detection environment, when detecting one of following condition, judge the block terminal trouble, inform alarm 42 and send alarm signal: the environment temperature exceeds a set value, the environment humidity exceeds a set value, and the user load current exceeds a set value for a preset duration.
Namely, when the monitored environmental temperature exceeds a set value, the environmental humidity exceeds a set value or the load current exceeds a set value and lasts for a certain time, the fault of the distribution box is considered to be monitored, and sound or other alarm information is sent out.
In the absence of an arc pulse, the microprocessor 2 sends, at set time intervals, the current value of the power supply circuit and the humidity value of the ambient temperature in which the alarm 42 is located.
In an embodiment of the present invention, the environmental parameter detecting unit 5 may adopt an intelligent sensor with an integrated temperature and humidity sensor, and is directly connected to an I2C interface of the microprocessor 2, and the software directly reads the temperature value and the humidity value through an I2C interface, and obtains the temperature value and the humidity value of the environment through operation.
In addition, the microprocessor 2 is also used for controlling the starting alarm 42 to send out an alarm signal when the energy collecting and current detecting unit 3 detects that the load current exceeds the set value and lasts for a long time, and meanwhile, the wireless signal transmitting unit 41 of the alarm 42 sends a wireless alarm signal to the central control room.
The microprocessor 2 is awakened at regular time, the load current, the environment temperature and the environment humidity are monitored, when the load current exceeds a set value and the duration time exceeds the set value, the sound alarm 42 is started to give an alarm, and meanwhile, the wireless signal transmitter sends a wireless alarm signal to the central control room; when the ambient temperature exceeds a set value and the duration exceeds the set value, starting the sound alarm 42 to give an alarm, and simultaneously sending a wireless alarm signal to the central control room by the wireless signal transmitter; when the ambient humidity exceeds the set value and the duration exceeds the set value, the audible alarm 42 is activated to alarm, and the wireless signal transmitter sends a wireless alarm signal to the central control room.
Accordingly, the wireless transmitter in the alarm 42 may transmit the alarm information of the arc fault when the arc fault occurs, and may also transmit the detected load current and the ambient temperature and humidity information at regular time.
In one embodiment of the present invention, the alarm 42 and the monitoring circuit are mounted by a snap fit, which is simple to mount and requires no wiring. As shown in fig. 2a, the fastening body is opened, the alarm 42 is fitted over the loop to be monitored, and then the fastening body is closed so that both the circuit transformer and the detection coil are fitted over the detection loop. Working as shown in fig. 2 b.
Preferably, the fastening body is a snap or a screw or a snap spring.
According to the microprocessor-based arc alarm without external power supply provided by the embodiment of the invention, at least one group of detection loops in the arc detection unit without power consumption are adopted to detect whether an arc fault occurs, and the energy acquisition circuit is adopted to provide the energy acquired from the current transformer to the rechargeable battery or the super capacitor, so that the arc fault of the alternating current power supply loop can be monitored without external power supply and wiring, and sound or other alarm information is sent out. The invention can be widely applied to the occasions of arc fault alarm, distribution box overheating alarm, cable joint overheating alarm, cable trench temperature alarm and the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A microprocessor-based arc alarm without external power supply, comprising: the system comprises a non-power consumption electric arc detection unit, a microprocessor, an alarm and a power supply unit, wherein the microprocessor is connected with the non-power consumption electric arc detection unit and the alarm, and the power supply unit is connected with the non-power consumption electric arc detection unit, the microprocessor and the alarm;
when an arc fault occurs, because the current under the arc fault has a high-frequency component, the voltage induced by each group of detection loops can drive the corresponding switch unit to be conducted, when a pulse signal is output, the arc signal is judged to be detected, and the output pulse signal is sent to the microprocessor; the detection loop comprises at least one detection coil, and each detection coil adopts an air-core coil without a magnetic core or a coil with a magnetic core;
the microprocessor is used for receiving the pulse signals and counting the number of pulses to judge whether the arc fault is detected, and the method comprises the following steps: within a preset time, if the number of pulses is between a first threshold value and a second threshold value, judging that an arc fault is detected, and sending an alarm instruction to the alarm; if the number of pulses is less than the first threshold value, judging that no arc fault exists; if the number of the pulses is larger than the second threshold value, judging that the signals are continuous interference signals and non-arc faults;
the alarm receives an alarm instruction from the microprocessor and sends an arc alarm signal according to the alarm instruction so as to prompt a user; the alarm adopts the form of buckle installation with the monitoring return circuit, opens the fastener, will the alarm cover is on the monitoring return circuit, then closed fastener to make current transformer and detection coil all overlap on the detection return circuit, wherein, the fastener is buckle or screw or jump ring.
2. The microprocessor-based no external power supply arc alarm of claim 1, wherein the alarm comprises an alarm unit and a wireless signal transmitting unit,
the wireless signal transmitting unit receives an alarm instruction from the microprocessor and performs alarm processing;
the alarm unit sends an arc alarm signal according to the alarm instruction, wherein the arc alarm signal adopts at least one of the following forms: sound, light, vibration, unmodulated radio signals, modulated radio signals.
3. A microprocessor based no external power supply arc alarm according to claim 2 wherein the wireless signal transmitting unit is adapted to wirelessly communicate in one of the following forms: zigbee, loran, LoRaWAN, NBIOT.
4. A microprocessor based no external power supply arc alarm according to claim 1 wherein the switching unit employs a low threshold MOS transistor or triode or an ultra low power integrated circuit.
5. The microprocessor-based no external power arc alarm of claim 1 further comprising: environmental parameter detecting element and energy are collected and current detection unit, environmental parameter detecting element with energy is collected and current detection unit with microprocessor connects for temperature and humidity data in the detection environment, when detecting one of following condition, judges the block terminal trouble, the notice alarm sends alarm signal:
the environment temperature exceeds a set value, the environment humidity exceeds a set value, and the user load current exceeds a set value for a preset duration.
6. The microprocessor-based arc alarm without external power supply according to claim 5, wherein the microprocessor is further configured to control the alarm to be activated to send out an alarm signal when the energy collection and current detection unit detects that the load current exceeds the set value and lasts for a long time, and simultaneously, the wireless signal transmission unit of the alarm sends out a wireless alarm signal to the central control room;
when the environmental parameter detection unit detects one of the following conditions, the control starts the alarm to send out an alarm signal, and simultaneously, the wireless signal transmitting unit of the alarm sends a wireless alarm signal to the central control room: the environment temperature exceeds a set value, and the duration time exceeds the set value; the ambient humidity exceeds the set value and the duration exceeds the set value.
7. A microprocessor based no external power supply arc alarm as claimed in claim 6 wherein the wireless signal transmitting unit in the alarm is also used to send information on the load current it detects and the ambient temperature and humidity it is in at regular intervals.
8. The microprocessor-based no external power supply arc alarm of claim 5, wherein the energy collection and current detection unit is connected to a current transformer, a power supply unit, the no power consumption arc detection unit, a microprocessor and an alarm,
the energy collecting and current detecting unit is used for collecting energy from the current transformer, supplying the collected energy to the power supply unit, the alarm, the non-power consumption arc detecting unit and the microprocessor, and detecting the current value of a user load.
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| CN109166262A (en) * | 2018-09-20 | 2019-01-08 | 上海枫昱能源科技有限公司 | Electric wiring fire alarm Internet of Things perception terminal and system based on Current Mutual Inductance |
| CN109239561A (en) * | 2018-11-29 | 2019-01-18 | 宁波习羽智能科技有限公司 | Slave, host and detector for split type fault electric arc detector |
| CN110275061A (en) * | 2019-07-02 | 2019-09-24 | 京信通信系统（中国）有限公司 | A kind of power detector and its control method, device, equipment, medium |
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| CN101696986B (en) * | 2009-10-26 | 2012-06-13 | 吴为麟 | Fault arc detection method and protection device adopting same |
| CN102375107B (en) * | 2011-09-20 | 2013-07-10 | 上海交通大学 | Method and device for detecting fault electric arc based on time-frequency comprehensive analysis |
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| CN1696723A (en) * | 2004-05-14 | 2005-11-16 | 人间电气技术株式会社 | Electric arc fault detector |
| CN102460188A (en) * | 2009-04-16 | 2012-05-16 | 全景电力有限公司 | Apparatus and methods thereof for power consumption measurement at circuit breaker points |
| CN104049183A (en) * | 2013-03-15 | 2014-09-17 | 森萨塔科技麻省公司 | Home run arc detection at the photovoltaic string level using multiple current sensors |
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