CN109638967A - A kind of Electrical Safety method for early warning of intelligent distribution box - Google Patents
A kind of Electrical Safety method for early warning of intelligent distribution box Download PDFInfo
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- 238000010276 construction Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 description 10
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Classifications
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- H02J13/0006—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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Abstract
The present invention discloses a kind of Electrical Safety method for early warning of intelligent distribution box, Step 1: the real-time current value I on acquisition distribution box inlet wire, and calculate current effective value Ia；Step 2: the real-time voltage value U on acquisition distribution box inlet wire, and calculate voltage effective value Ua；Step 3: the absolute threshold of the absolute threshold of setting real-time current value I, real-time voltage value U, effective threshold value, the effective threshold value of voltage effective value Ua of setting electric current virtual value Ia；Step 4: carrying out overcurrent protection early warning to real-time current value I and current effective value Ia, when real-time current value I or current effective value Ia is more than corresponding threshold value, overcurrent protection is carried out, is cut off the power, issue early warning；Step 5: carrying out two-way transfinite to the electric signal on route protects early warning.The technical issues of present invention solves line fault early warning not in time.
Description
Technical field
The present invention relates to intelligent power monitoring technology fields, and in particular to a kind of pre- police of the Electrical Safety of intelligent distribution box
Method.
Background technique
The development of technology of Internet of things last decade is very rapid.Important component of the Internet of Things as generation information technology,
It is the third time world information industry tide after computer, internet, and has the tendency that gradually substituting conventional internet.Its
Using throughout intelligent transportation, environmental protection, municipal administration, public safety, safety home, intelligent fire, industrial detection, environment inspection
The various fields such as survey, old man's nursing, personal health, flower culture, water system detection, foodstuff traceability, enemy's situation investigation and information search.
For the huge market potential of internet of things service and development speed, it is whole to continue a comprehensively monitoring based on Internet of Things electricity consumption
Hold --- --- intelligent domestic distribution box.
Electricity consumption integrative monitoring terminal based on Internet of Things mainly includes that monitor terminal, carrier network services device and user are whole
End.Monitor terminal i.e. our equipment to be done, mainly the data acquisition and communication of circuit, later monitor terminal and operator's net
Network carries out information exchange, and server is responsible for the analysis of data, summarizes, stores and operation etc..User terminal (mobile phone, computer) can be with
It accesses to server and the publication of control command.
The not long-range failure monitoring of intelligent domestic distribution box and warning function at present, or when overcurrent, overvoltage are sent out
When raw, not in time, then line fault is further serious for alarm and processing, and line facility is lost.
Summary of the invention
It is an object of the invention to solve at least the above problems, and provide the advantages of at least will be described later.
The object of the present invention is to provide a kind of Electrical Safety method for early warning of intelligent distribution box, on software, pass through monitoring
With calculate the value of electrical signals on route, and be compared with setting value, when any one of virtual value or absolute value are more than setting value
Shi Jinhang alarm and protection, meanwhile, led to by the two-way protection of transfiniting of level-one when overcurrent or overvoltage generation on hardware
It crosses two-way transfinite to protect circuit that can issue early warning in time and carry out protection processing, the present invention solves line fault early warning not
Timely technical problem.
In order to realize these purposes according to the present invention and other advantages, a kind of Electrical Safety of intelligent distribution box is provided
Method for early warning, comprising the following steps:
Step 1: the real-time current value I on acquisition distribution box inlet wire, and calculate current effective value Ia；
Step 2: the real-time voltage value U on acquisition distribution box inlet wire, and calculate voltage effective value Ua；
Step 3: the absolute threshold of the absolute threshold of setting real-time current value I, real-time voltage value U, setting electric current virtual value
Effective threshold value, the effective threshold value of voltage effective value Ua of Ia；
Step 4: overcurrent protection early warning is carried out to real-time current value I and current effective value Ia, when real-time current value I or electricity
When flowing virtual value Ia more than corresponding threshold value, overcurrent protection is carried out, is cut off the power, issues early warning；
Alternatively, overvoltage protection early warning is carried out to real-time voltage value U and voltage effective value Ua, when real-time voltage value U and voltage
When virtual value Ua is more than corresponding threshold value, overvoltage protection is carried out, is cut off the power, issues early warning；
Step 5: carrying out two-way transfinite to the electric signal on route protects early warning.
Preferably, one signal acquisition circuit of construction, the signal acquisition circuit include:
Several concatenated divider resistances, first divider resistance connect firewire end of incoming cables, the last one described partial pressure
Resistance connects the non-inverting input terminal of a first comparator, and the output end of the first comparator is connected to voltage acquisition end；
Voltage sample resistance, first end connect the non-inverting input terminal of the first comparator, the voltage acquisition resistance
Second end connect the first power end, first power end connects zero curve end of incoming cables；
First bleeder circuit comprising concatenated two resistance, the first electricity of first end connection of first bleeder circuit
Source, the second end of first bleeder circuit connect the output end of the first comparator, in first bleeder circuit
Between end connect the inverting input terminal of the first comparator；
Current sampling resistor, is connected on the zero curve end of incoming cables, the first end connection 1 of the current sampling resistor the
The output end of the non-inverting input terminal of two comparators, second comparator is connected to current acquisition end；
Second bleeder circuit comprising concatenated two resistance, the first electricity of first end connection of second bleeder circuit
Source, the second end of second bleeder circuit connect the output end of second comparator, in second bleeder circuit
Between end connect the inverting input terminal of second comparator.
Preferably, two-way transfinite of construction one protects circuit, which includes:
Third comparator, inverting input terminal are connect with current signal or voltage signal end, the third comparator it is same
Phase input terminal connects the centre of a third bleeder circuit；
4th comparator, non-inverting input terminal are connect with current signal or voltage signal end, the 4th comparator it is anti-
Phase input terminal connects the centre of one the 4th bleeder circuit；
First triode, is p-type triode, the base stage of first triode respectively with the third comparator and the
The output ends of four comparators connects, and the collector of first triode connects the first end of one the 5th bleeder circuit, and described the
The second end of five bleeder circuits is grounded；And
Second triode, is N-type triode, and the base stage of second triode is connected to the 5th bleeder circuit
Intermediate ends, the emitter ground connection of second triode, the collector of second triode are connected to the two-way guarantor of transfiniting
The output end of protection circuit.
Preferably, the first comparator to the 4th comparator is connected to second source end, the electricity of first power end
Pressure value is the half of second source terminal voltage value, and the emitter of first triode connects the second source end.
Preferably, A/D sampling, the calculation method of the real-time current value I are carried out to the real-time current I are as follows:
I=(IAD/X*VCC-VCC/2)/(1+R3/R2)/Ris；
Wherein, X is A/D full scale numerical value, and the instant A/D data of electric current are IAD, and VCC is second source terminal voltage value,
Ris is current sampling resistor, and R3, R2 are two resistance in the second bleeder circuit.
Preferably, A/D sampling, the calculation method of the real-time voltage value U are carried out to the real-time current U are as follows:
U=(UAD/X*VCC-VCC/2)/(1+R11/R10) * (R5+R6+R7+R8+R9)/R9；
Wherein, the instant A/D data of voltage are UAD, and VCC is second source terminal voltage value, and R9 is voltage sample resistance,
R11, R10 are two resistance in the first bleeder circuit, and R5-R9 is the divider resistance.
Preferably, in step 1, the calculation method of the current effective value Ia are as follows:
The calculation method of the voltage effective value Ua are as follows:
Wherein, In is collected each real-time current value in a cycle, and Un is in a cycle, collected each
A real-time voltage value, the data amount check of a cycle A/D acquisition are N.
Preferably, two-way transfinite protects the input terminal of circuit and the output end of the signal acquisition circuit to connect,
The third comparator carries out negative protection of transfiniting to real-time current value I or real-time voltage value U and compares, and the 4th comparator is to reality
When current value I or real-time voltage value U protection of just being transfinited compare, when it is negative transfinite or just transfinite protect when, trigger the one or three pole
Pipe conducting, and then trigger the second triode output protection driving signal.
Preferably, between the non-inverting input terminal and ground wire of the third comparator, the anti-phase input of the 4th comparator
A capacitor is separately connected between end and ground wire, between second transistor base and ground wire.
Preferably, the base stage of first triode passes through a resistance and the third comparator and the 4th comparator respectively
Output end connection, the inverting input terminal of the third comparator, the non-inverting input terminal of the 4th comparator pass through a resistance respectively
It is connect with the output end of the signal acquisition circuit.
Compared with prior art, the beneficial effect that the present invention includes is:
1, the present invention can remotely monitor the electric signal on distribution box, facilitate terminal monitoring and control；
2, by the improvement of software algorithm, threshold determination is carried out well according to collected signal, when any electric signal
When virtual value or instantaneous value transfinite, early warning and protection processing are carried out；
3, protect circuit timely by two-way transfinite when overcurrent or overvoltage generation by the improvement of hardware
It issues early warning and carries out protection processing, to realize the duplicate protection of software and hardware, improve the safety of route electricity consumption.
Further advantage, target and feature of the invention will be partially reflected by the following instructions, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Detailed description of the invention
Fig. 1 is power circuit diagram；
Fig. 2 is signal acquisition circuit figure；
Fig. 3 is that two-way transfinite protects circuit diagram.
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings, to enable those skilled in the art referring to comment
It can implement accordingly.
The present invention provides a kind of Electrical Safety method for early warning of intelligent distribution box, construct electrical signal collection electricity first
Monitoring result in order to carry out real-time monitoring to the electric signal on route, and is sent to distance terminal, realizes long-range prison by road
Control.
As shown in Figs. 1-2, which includes:
Several concatenated divider resistance R5-R8, first divider resistance R5 connection firewire end of incoming cables, the last one institute
The non-inverting input terminal of one first comparator OP1 of divider resistance R8 connection is stated, the output end of the first comparator OP1 passes through resistance
R12 is connected to voltage acquisition end.
Voltage sample resistance R9, first end connect the non-inverting input terminal of the first comparator OP1, the voltage acquisition
The second end of resistance R9 connects the first power end VCC/2, the first power end VCC/2 connection zero curve end of incoming cables, voltage sample
One capacitor C9 of the both ends resistance R9 parallel connection.
First bleeder circuit comprising the first end of concatenated two resistance R10 and R11, the R10 connect the first power supply
VCC/2 is held, the second end of the R11 connects the output end of the first comparator OP1, and the R10 is connected with the intermediate ends of R11
The inverting input terminal of the first comparator OP1.
Current sampling resistor Ris, is connected on the zero curve end of incoming cables, and the first end of the current sampling resistor Ris is logical
Cross the non-inverting input terminal of one second comparator OP2 of resistance R1 connection, resistance R1 second end and current sampling resistor Ris first end two
One capacitor C7 of parallel connection is held, the output end of the second comparator OP2 is connected to current acquisition end by resistance R4.
Second bleeder circuit comprising the first end of concatenated two resistance R2 and R3, the R2 connect the first power end
VCC/2, the second end of the R3 connect the output end of the second comparator OP2, described in the R2 is connected with the intermediate ends of R3
The inverting input terminal of second comparator OP2.
In above-mentioned technical proposal, the first comparator OP1 to the 4th comparator OP4 is connected to second source end VCC, institute
The voltage value for stating the first power end is the half of second source terminal voltage value.Power circuit is as shown in Figure 1, the first three-terminal voltage-stabilizing mould
Block exports second source end VCC, and the second three-terminal voltage-stabilizing module exports the first power end VCC/2.The hair of the first triode Q1
Emitter-base bandgap grading connects the second source end VCC.
The Electrical Safety method for early warning of intelligent distribution box specifically includes the following steps:
Step 1: the real-time current value I on acquisition distribution box inlet wire, and calculate current effective value Ia；To described real-time
Electric current I carries out A/D sampling, the calculation method of the real-time current value I are as follows:
I=(IAD/X*VCC-VCC/2)/(1+R3/R2)/Ris；
Wherein, X is A/D full scale numerical value, and the instant A/D data of electric current are IAD, and VCC is second source terminal voltage value,
Ris is current sampling resistor, and R3, R2 are two resistance in the second bleeder circuit.
In step 1, the calculation method of the current effective value Ia are as follows:
Step 2: the real-time voltage value U on acquisition distribution box inlet wire, and calculate voltage effective value Ua；To described real-time
Electric current U carries out A/D sampling, the calculation method of the real-time voltage value U are as follows:
U=(UAD/X*VCC-VCC/2)/(1+R11/R10) * (R5+R6+R7+R8+R9)/R9；
Wherein, the instant A/D data of voltage are UAD, and VCC is second source terminal voltage value, and R9 is voltage sample resistance,
R11, R10 are two resistance in the first bleeder circuit, and R5-R9 is the divider resistance.
The calculation method of the voltage effective value Ua are as follows:
Wherein, In is collected each real-time current value in a cycle, and Un is in a cycle, collected each
A real-time voltage value, the data amount check of a cycle A/D acquisition are N.
Step 3: the absolute threshold of the absolute threshold of real-time current value I, real-time voltage value U are set in software algorithm, if
Effective threshold value, the effective threshold value of voltage effective value Ua of constant current virtual value Ia；For example, absolute threshold can be voltage or electric current
1.3 times of peak value, effective threshold value can be 1.2 times of voltage or current effective value, according to route general power and can specifically set
Standby parameter is set；
Step 4: the instantaneous value and virtual value that are calculated according to step 1, in software algorithm to real-time current value I and
Current effective value Ia carries out overcurrent protection early warning, when real-time current value I or current effective value Ia is more than corresponding threshold value, carries out
Overcurrent protection is cut off the power, and early warning is issued；
Alternatively, overvoltage protection early warning is carried out to real-time voltage value U and voltage effective value Ua, when real-time voltage value U and voltage
When virtual value Ua is more than corresponding threshold value, overvoltage protection is carried out, is cut off the power, issues early warning；Thus to telecommunications on software
Number efficient early warning and protection are carried out；
Step 5: carrying out two-way transfinite to the electric signal on route protects early warning.Specifically, the two-way protection of transfiniting of construction one
Circuit, as shown in figure 3, the two-way protection of transfiniting includes:
The inverting input terminal of third comparator OP3 is connect with current signal or voltage signal end, the third comparator OP3
Non-inverting input terminal connect third bleeder circuit a R14 and R15 centre；
The non-inverting input terminal of 4th comparator OP4 is connect with current signal or voltage signal end, the 4th comparator OP4
Inverting input terminal connect one the 4th bleeder circuit R17 and R18 centre；
First triode Q1 be p-type triode, the base stage of the first triode Q1 respectively with the third comparator OP3
It is connected with the output end of the 4th comparator OP4, the collector of the first triode Q1 connects the first of one the 5th bleeder circuit
End, the second end ground connection of the 5th bleeder circuit；And
Second triode Q2 is N-type triode, and the base stage of the second triode Q2 is connected to the 5th bleeder circuit
Intermediate ends, the second triode Q2 emitter ground connection, the collector of the second triode Q2 is connected to described two-way
It transfinites and protects the output end of circuit.
Wherein, capacitor C11 is set between the non-inverting input terminal and ground wire of the third comparator OP3, and the described 4th compares
Capacitor C12 is set between the inverting input terminal and ground wire of device OP4, is separately connected between the second triode Q2 base stage and ground wire
One capacitor C13.
The base stage of the first triode Q1 is connect by a resistance R19 with the output end of the third comparator OP3, institute
The base stage for stating the first triode Q1 is connected by the output end of a resistance R20 and the 4th comparator OP4, the third comparator
The inverting input terminal of OP3 is connect by a resistance R13 with the output end of the signal acquisition circuit.Meanwhile the 4th comparator
The non-inverting input terminal of OP4 passes through a resistance R16 respectively and connect with the output end of the signal acquisition circuit.
Two-way transfinite protects the input terminal of circuit and the output end of the signal acquisition circuit to connect, the third
Comparator OP3 carries out negative protection of transfiniting to real-time current value I or real-time voltage value U and compares, and the 4th comparator OP4 is to real-time
Current value I or real-time voltage value U protection of just being transfinited is compared, when it is negative transfinite or just transfinite protect when, trigger the first triode
Q1 conducting, and then trigger the second triode Q2 output protection driving signal.
From the above mentioned, the present invention carries out on software by monitoring and calculating the value of electrical signals on route, and with setting value
Compare, is alarmed and protected when any one of virtual value or absolute value are more than setting value, meanwhile, pass through level-one on hardware
Two-way protection of transfiniting protects circuit that can issue in time early warning simultaneously when overcurrent or overvoltage generation by two-way transfinite
Carry out protection processing.
For example be that the virtual value of electric current is limited, then it is that the current effective value calculated by software is compared with setting value
Compared with deciding whether to protect.Absolute value threshold values can be calculated according to virtual value threshold values simultaneously, any one data is more than absolute value
Threshold values, starting protection strategy, protection speed are fast at once.It in addition, can be faster on hardware plus after the two-way protection of transfiniting of level-one
Protect the overcurrent of short circuit.
It is understood that overvoltage can also use this two-way protection for protecting circuit to carry out the limit of transfiniting.
To sum up, the present invention can remotely monitor the electric signal on distribution box, facilitate terminal monitoring and control；Meanwhile passing through
The improvement of software algorithm carries out well threshold determination according to collected signal, when the virtual value or instantaneous value of any electric signal
When transfiniting, early warning and protection processing are carried out；Further, passed through by the improvement of hardware when overcurrent or overvoltage generation
Two-way transfinite protects circuit that can issue early warning in time and carries out protection processing, to realize the duplicate protection of software and hardware, mentions
The high safety of route electricity consumption.
Although the embodiments of the present invention have been disclosed as above, but its is not only in the description and the implementation listed
With it can be fully applied to various fields suitable for the present invention, for those skilled in the art, can be easy
Realize other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is simultaneously unlimited
In specific details and legend shown and described herein.
Claims (10)
1. a kind of Electrical Safety method for early warning of intelligent distribution box, which comprises the following steps:
Step 1: the real-time current value I on acquisition distribution box inlet wire, and calculate current effective value Ia；
Step 2: the real-time voltage value U on acquisition distribution box inlet wire, and calculate voltage effective value Ua；
Step 3: the absolute threshold of the absolute threshold of setting real-time current value I, real-time voltage value U, setting electric current virtual value Ia's
Effective threshold value, effective threshold value of voltage effective value Ua；
Step 4: overcurrent protection early warning is carried out to real-time current value I and current effective value Ia, when real-time current value I or electric current have
When valid value Ia is more than corresponding threshold value, overcurrent protection is carried out, is cut off the power, issues early warning；
Alternatively, overvoltage protection early warning is carried out to real-time voltage value U and voltage effective value Ua, when real-time voltage value U and voltage are effective
When value Ua is more than corresponding threshold value, overvoltage protection is carried out, is cut off the power, issues early warning；
Step 5: carrying out two-way transfinite to the electric signal on route protects early warning.
2. the Electrical Safety method for early warning of intelligent distribution box as described in claim 1, which is characterized in that one electric signal of construction is adopted
Collector, the signal acquisition circuit include:
Several concatenated divider resistances, first divider resistance connect firewire end of incoming cables, the last one described divider resistance
The non-inverting input terminal of a first comparator is connected, the output end of the first comparator is connected to voltage acquisition end；
Voltage sample resistance, first end connect the non-inverting input terminal of the first comparator, and the of the voltage acquisition resistance
Two ends connect the first power end, and first power end connects zero curve end of incoming cables；
First bleeder circuit comprising the first end of concatenated two resistance, first bleeder circuit connects the first power end,
The second end of first bleeder circuit connects the output end of the first comparator, and the intermediate ends of first bleeder circuit connect
Connect the inverting input terminal of the first comparator；
Current sampling resistor is connected on the zero curve end of incoming cables, one second ratio of first end connection of the current sampling resistor
Compared with the non-inverting input terminal of device, the output end of second comparator is connected to current acquisition end；
Second bleeder circuit comprising the first end of concatenated two resistance, second bleeder circuit connects the first power end,
The second end of second bleeder circuit connects the output end of second comparator, and the intermediate ends of second bleeder circuit connect
Connect the inverting input terminal of second comparator.
3. the Electrical Safety method for early warning of intelligent distribution box as claimed in claim 2, which is characterized in that construction one is two-way to transfinite
Circuit is protected, which includes:
Third comparator, inverting input terminal are connect with current signal or voltage signal end, the third comparator it is same mutually defeated
Enter the centre of one third bleeder circuit of end connection；
4th comparator, non-inverting input terminal are connect with current signal or voltage signal end, and the reverse phase of the 4th comparator is defeated
Enter the centre of one the 4th bleeder circuit of end connection；
First triode, is p-type triode, and the base stage of first triode compares with the third comparator and the 4th respectively
Output end compared with device connects, the first end of collector one the 5th bleeder circuit of connection of first triode, and described 5th point
The second end of volt circuit is grounded；And
Second triode, is N-type triode, and the base stage of second triode is connected to the centre of the 5th bleeder circuit
End, the emitter ground connection of second triode, the collector of second triode are connected to two-way transfinite and protect electricity
The output end on road.
4. the Electrical Safety method for early warning of intelligent distribution box as claimed in claim 3, which is characterized in that the first comparator
Power end to the 4th comparator is connected to second source end, and the voltage value of first power end is second source terminal voltage value
Half, the emitter of first triode connects the second source end.
5. the Electrical Safety method for early warning of intelligent distribution box as claimed in claim 4, which is characterized in that the real-time current
I carries out A/D sampling, the calculation method of the real-time current value I are as follows:
I=(IAD/X*VCC-VCC/2)/(1+R3/R2)/Ris；
Wherein, X is A/D full scale numerical value, and the instant A/D data of electric current are IAD, and VCC is second source terminal voltage value, and Ris is
Current sampling resistor, R3, R2 are two resistance in the second bleeder circuit.
6. the Electrical Safety method for early warning of intelligent distribution box as claimed in claim 5, which is characterized in that the real-time current
U carries out A/D sampling, the calculation method of the real-time voltage value U are as follows:
U=(UAD/X*VCC-VCC/2)/(1+R11/R10) * (R5+R6+R7+R8+R9)/R9；
Wherein, the instant A/D data of voltage are UAD, and VCC is second source terminal voltage value, and R9 is voltage sample resistance, R11,
R10 is two resistance in the first bleeder circuit, and R5-R9 is the divider resistance.
7. the Electrical Safety method for early warning of intelligent distribution box as claimed in claim 6, which is characterized in that described in step 1
The calculation method of current effective value Ia are as follows:
The calculation method of the voltage effective value Ua are as follows:
Wherein, In is collected each real-time current value in a cycle, and Un is collected each reality in a cycle
When voltage value, a cycle A/D acquisition data amount check be N.
8. the Electrical Safety method for early warning of intelligent distribution box as claimed in claim 7, which is characterized in that the two-way guarantor of transfiniting
The input terminal of protection circuit is connect with the output end of the signal acquisition circuit, the third comparator to real-time current value I or
Real-time voltage value U carries out negative protection of transfiniting and compares, and the 4th comparator carries out just real-time current value I or real-time voltage value U
Protection of transfiniting is compared, when it is negative transfinite or just transfinite protect when, trigger the first triode ON, and then trigger the output of the second triode
Protect driving signal.
9. the Electrical Safety method for early warning of intelligent distribution box as claimed in claim 8, which is characterized in that the third comparator
Non-inverting input terminal and ground wire between, between the inverting input terminal and ground wire of the 4th comparator, the second triode base
A capacitor is separately connected between pole and ground wire.
10. the Electrical Safety method for early warning of intelligent distribution box as claimed in claim 9, which is characterized in that the one or three pole
The base stage of pipe passes through a resistance respectively and connect with the output end of the third comparator and the 4th comparator, the third comparator
Inverting input terminal, the non-inverting input terminal of the 4th comparator pass through the output end of a resistance Yu the signal acquisition circuit respectively
Connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811637556.6A CN109638967B (en) | 2018-12-29 | 2018-12-29 | Power utilization safety early warning method for intelligent distribution box |
Applications Claiming Priority (1)
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