CN109638967B - Power utilization safety early warning method for intelligent distribution box - Google Patents
Power utilization safety early warning method for intelligent distribution box Download PDFInfo
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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 invention discloses an electricity safety early warning method of an intelligent distribution box, which comprises the following steps of collecting a real-time current value I on an inlet wire of the distribution box, and calculating a current effective value Ia; step two, acquiring a real-time voltage value U on an inlet wire of a distribution box, and calculating a voltage effective value Ua; setting an absolute threshold of a real-time current value I and an absolute threshold of a real-time voltage value U, and setting an effective threshold of a current effective value Ia and an effective threshold of a voltage effective value Ua; fourthly, carrying out overcurrent protection early warning on the real-time current value I and the current effective value Ia, carrying out overcurrent protection when the real-time current value I or the current effective value Ia exceeds a corresponding threshold value, cutting off a power supply, and sending out early warning; and fifthly, performing bidirectional overrun protection early warning on the electric signals on the line. The invention solves the technical problem that the line fault early warning is not timely.
Description
Technical Field
The invention relates to the technical field of intelligent power utilization monitoring, in particular to a power utilization safety early warning method of an intelligent distribution box.
Background
The internet of things technology has developed very rapidly in the last decade. The internet of things is an important component of a new generation of information technology, is a third world information industry surge after computers and the internet, and has a tendency of gradually replacing the traditional internet. The intelligent fire-fighting intelligent vehicle is applied to a plurality of fields such as intelligent transportation, environmental protection, municipal management, public safety, safe home, intelligent fire fighting, industrial detection, environmental detection, old people care, personal health, flower cultivation, water system detection, food source tracing, enemy investigation, information search and the like. Aiming at huge market potential and development speed of Internet of things services, a comprehensive monitoring terminal based on Internet of things power utilization is continued, namely an intelligent household distribution box.
The comprehensive power utilization monitoring terminal based on the Internet of things mainly comprises a monitoring terminal, an operator network server and a user terminal. The monitoring terminal is the device which we need to do, mainly including data acquisition and communication of circuits, then the monitoring terminal and an operator network perform information interaction, and the server is responsible for data analysis, summarization, storage, operation and the like. The user terminal (mobile phone, computer) can access the server and issue control commands.
At present, an intelligent household distribution box has no remote fault monitoring and alarming functions, or when overcurrent and overvoltage occur, alarming and processing are not timely, line faults are further serious at the moment, and line equipment is lost.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
The invention aims to provide an electricity safety early warning method for an intelligent distribution box.
To achieve these objects and other advantages in accordance with the present invention, there is provided a power safety warning method for an intelligent distribution box, including the steps of:
step one, acquiring a real-time current value I on an incoming line of a distribution box, and calculating a current effective value Ia;
step two, acquiring a real-time voltage value U on an inlet wire of a distribution box, and calculating a voltage effective value Ua;
setting an absolute threshold of a real-time current value I and an absolute threshold of a real-time voltage value U, and setting an effective threshold of a current effective value Ia and an effective threshold of a voltage effective value Ua;
fourthly, carrying out overcurrent protection early warning on the real-time current value I and the current effective value Ia, carrying out overcurrent protection when the real-time current value I or the current effective value Ia exceeds a corresponding threshold value, cutting off a power supply, and sending out early warning;
or carrying out overvoltage protection early warning on the real-time voltage value U and the effective voltage value Ua, and carrying out overvoltage protection, cutting off a power supply and sending out early warning when the real-time voltage value U and the effective voltage value Ua exceed corresponding threshold values;
and fifthly, performing bidirectional overrun protection early warning on the electric signals on the line.
Preferably, an electrical signal acquisition circuit is constructed, the electrical signal acquisition circuit comprising:
the voltage divider comprises a plurality of voltage divider resistors connected in series, wherein the first voltage divider resistor is connected with a live wire incoming line end, the last voltage divider resistor is connected with a non-inverting input end of a first comparator, and the output end of the first comparator is connected with a voltage acquisition end;
a first end of the voltage sampling resistor is connected with a non-inverting input end of the first comparator, a second end of the voltage sampling resistor is connected with a first power end, and the first power end is connected with a zero line incoming line end;
a first voltage divider circuit comprising two resistors connected in series, wherein a first end of the first voltage divider circuit is connected to a first power supply terminal, a second end of the first voltage divider circuit is connected to an output terminal of the first comparator, and a middle end of the first voltage divider circuit is connected to an inverting input terminal of the first comparator;
the current sampling resistor is connected with the in-phase input end of a second comparator and one end of an external load at a first end, the other end of the external load is connected to the live wire incoming line end, the second end of the current sampling resistor is connected with the zero line incoming line end, and the output end of the second comparator is connected to the current acquisition end;
and the second voltage division circuit comprises two resistors connected in series, a first end of the second voltage division circuit is connected with a first power supply end, a second end of the second voltage division circuit is connected with an output end of the second comparator, and a middle end of the second voltage division circuit is connected with an inverting input end of the second comparator.
Preferably, a bidirectional overrun protection circuit is constructed, the bidirectional overrun protection circuit comprising:
the inverting input end of the third comparator is connected with the current signal or voltage signal end, and the non-inverting input end of the third comparator is connected with the middle of a third voltage division circuit;
the non-inverting input end of the fourth comparator is connected with the current signal or voltage signal end, and the inverting input end of the fourth comparator is connected with the middle of a fourth voltage-dividing circuit;
the base electrode of the first triode is respectively connected with the output ends of the third comparator and the fourth comparator, the collector electrode of the first triode is connected with the first end of a fifth voltage-dividing circuit, and the second end of the fifth voltage-dividing circuit is grounded; and
and the base electrode of the second triode is connected to the middle end of the fifth voltage division circuit, the emitting electrode of the second triode is grounded, and the collecting electrode of the second triode is connected to the output end of the bidirectional overrun protection circuit.
Preferably, the first comparator to the fourth comparator are connected to a second power supply end, the voltage value of the first power supply end is half of the voltage value of the second power supply end, and the emitter of the first triode is connected to the second power supply end.
Preferably, a/D sampling is performed on the real-time current, and the calculation method of the real-time current value I is as follows:
I＝(IAD/X*VCC-VCC/2)/(1+R3/R2)/Ris；
wherein, X is the full scale numerical value of A/D, the instant A/D data of the current is IAD, VCC is the voltage value of the second power supply, Ris is the current sampling resistor, and R3 and R2 are two resistors in the second voltage division circuit.
Preferably, a/D sampling is performed on the real-time voltage, and the calculation method of the real-time voltage value U is as follows:
U＝(UAD/X*VCC-VCC/2)/(1+R11/R10)*(R5+R6+R7+R8+R9)/R9；
the real-time A/D data of the voltage is UAD, VCC is a voltage value of the second power supply terminal, R9 is a voltage sampling resistor, R11 and R10 are two resistors in a first voltage division circuit, and R5, R6, R7 and R8 are the voltage division resistors.
Preferably, in the first step, the current effective value Ia is calculated by:
the calculation method of the voltage effective value Ua comprises the following steps:
the number of data acquired In one period of A/D is N, N is 1,2,3 … N, In is the nth real-time current value acquired In one period, and Un is the nth real-time voltage value acquired In one period.
Preferably, the input end of the bidirectional overrun protection circuit is connected with the output end of the electric signal acquisition circuit, the third comparator performs negative overrun protection comparison on the real-time current value I or the real-time voltage value U, the fourth comparator performs positive overrun protection comparison on the real-time current value I or the real-time voltage value U, and when the negative overrun or the positive overrun protection is performed, the first triode is triggered to be conducted, so that the second triode is triggered to output a protection driving signal.
Preferably, a capacitor is respectively connected between the non-inverting input terminal of the third comparator and the ground line, between the inverting input terminal of the fourth comparator and the ground line, and between the base of the second triode and the ground line.
Preferably, the base of the first triode is connected with the output ends of the third comparator and the fourth comparator through a resistor, and the inverting input end of the third comparator and the non-inverting input end of the fourth comparator are connected with the output end of the electric signal acquisition circuit through a resistor.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention can remotely monitor the electric signal on the distribution box, thereby facilitating the monitoring and control of the terminal;
2. through improvement of a software algorithm, threshold judgment is carried out according to the collected signals, and early warning and protection processing are carried out when the effective value or the instantaneous value of any electric signal exceeds the limit;
3. through the improvement of hardware, when overcurrent or overvoltage takes place, can in time send the early warning and protect and handle through two-way overrun protection circuit to realize the duplicate protection of software and hardware, improved the security of circuit power consumption.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a power supply circuit diagram;
FIG. 2 is a diagram of an electrical signal acquisition circuit;
fig. 3 is a circuit diagram of a bi-directional over-limit protection circuit.
Detailed Description
The present invention is described in further detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description.
The invention provides an electricity safety early warning method of an intelligent distribution box.
As shown in fig. 1-2, the electrical signal acquisition circuit includes:
the voltage divider comprises a plurality of voltage divider resistors R5-R8 which are connected in series, wherein the first voltage divider resistor R5 is connected with the live wire incoming line end, the last voltage divider resistor R8 is connected with the non-inverting input end of a first comparator OP1, and the output end of the first comparator OP1 is connected with the voltage acquisition end through a resistor R12.
The first end of the voltage sampling resistor R9 is connected with the in-phase input end of the first comparator OP1, the second end of the voltage sampling resistor R9 is connected with a first power end VCC/2, the first power end VCC/2 is connected with a zero line incoming line end, and two ends of the voltage sampling resistor R9 are connected with a capacitor C9 in parallel.
The first voltage division circuit comprises two resistors R10 and R11 which are connected in series, a first end of the R10 is connected with a first power supply terminal VCC/2, a second end of the R11 is connected with an output end of the first comparator OP1, and a middle end of the R10 and the R11 is connected with an inverting input end of the first comparator OP 1.
The current sampling resistor Ris is connected to the zero line incoming line end in series, the first end of the current sampling resistor Ris is connected with the non-inverting input end of a second comparator OP2 through a resistor R1, the second end of a resistor R1 and the two ends of the first end of the current sampling resistor Ris are connected with a capacitor C7 in parallel, and the output end of the second comparator OP2 is connected to the current collecting end through a resistor R4.
And the second voltage division circuit comprises two resistors R2 and R3 which are connected in series, wherein a first end of the R2 is connected with a first power supply end VCC/2, a second end of the R3 is connected with an output end of the second comparator OP2, and a middle end of the R2 and the R3 is connected with an inverting input end of the second comparator OP 2.
In the above technical solution, the first comparator OP1 to the fourth comparator OP4 are connected to the second power supply terminal VCC, and the voltage value of the first power supply terminal is half of the voltage value of the second power supply terminal. As shown in fig. 1, the first three-terminal regulator outputs a second power terminal VCC, and the second three-terminal regulator outputs a first power terminal VCC/2. An emitter of the first triode Q1 is connected to the second power terminal VCC.
The electricity safety early warning method of the intelligent distribution box specifically comprises the following steps:
step one, acquiring a real-time current value I on an incoming line of a distribution box, and calculating a current effective value Ia; A/D sampling is carried out on the real-time current, and the calculation method of the real-time current value I comprises the following steps:
I＝(IAD/X*VCC-VCC/2)/(1+R3/R2)/Ris；
wherein, X is the full scale numerical value of A/D, the instant A/D data of the current is IAD, VCC is the voltage value of the second power supply, Ris is the current sampling resistor, and R3 and R2 are two resistors in the second voltage division circuit.
In the first step, the calculation method of the current effective value Ia is as follows:
step two, acquiring a real-time voltage value U on an inlet wire of a distribution box, and calculating a voltage effective value Ua; A/D sampling is carried out on the real-time voltage, and the calculation method of the real-time voltage value U comprises the following steps:
U＝(UAD/X*VCC-VCC/2)/(1+R11/R10)*(R5+R6+R7+R8+R9)/R9；
the real-time A/D data of the voltage is UAD, VCC is a voltage value of the second power supply terminal, R9 is a voltage sampling resistor, R11 and R10 are two resistors in a first voltage division circuit, and R5, R6, R7 and R8 are the voltage division resistors.
The calculation method of the voltage effective value Ua comprises the following steps:
the number of data acquired In one period of A/D is N, N is 1,2,3 … N, In is the nth real-time current value acquired In one period, and Un is the nth real-time voltage value acquired In one period.
Setting an absolute threshold of a real-time current value I and an absolute threshold of a real-time voltage value U in a software algorithm, and setting an effective threshold of a current effective value Ia and an effective threshold of a voltage effective value Ua; for example, the absolute threshold may be 1.3 times of the peak value of the voltage or current, and the effective threshold may be 1.2 times of the effective value of the voltage or current, and may be specifically set according to the total power of the line and the equipment parameters;
fourthly, performing overcurrent protection early warning on the real-time current value I and the current effective value Ia on a software algorithm according to the instantaneous value and the effective value obtained by calculation in the first step, and performing overcurrent protection, cutting off a power supply and sending out early warning when the real-time current value I or the current effective value Ia exceeds a corresponding threshold value;
or carrying out overvoltage protection early warning on the real-time voltage value U and the effective voltage value Ua, and carrying out overvoltage protection, cutting off a power supply and sending out early warning when the real-time voltage value U and the effective voltage value Ua exceed corresponding threshold values; therefore, the electric signals are effectively pre-warned and protected on software;
and fifthly, performing bidirectional overrun protection early warning on the electric signals on the line. Specifically, a bidirectional over-limit protection circuit is constructed, as shown in fig. 3, the bidirectional over-limit protection circuit includes:
the inverting input end of the third comparator OP3 is connected with the current signal or voltage signal end, and the non-inverting input end of the third comparator OP3 is connected with the middle of a third voltage division circuit R14 and R15;
the non-inverting input terminal of the fourth comparator OP4 is connected to the current signal or voltage signal terminal, and the inverting input terminal of the fourth comparator OP4 is connected to the middle of a fourth voltage-dividing circuit R17 and R18;
the first triode Q1 is a P-type triode, the base of the first triode Q1 is connected with the output ends of the third comparator OP3 and the fourth comparator OP4, respectively, the collector of the first triode Q1 is connected with the first end of a fifth voltage-dividing circuit, and the second end of the fifth voltage-dividing circuit is grounded; and
the second triode Q2 is an N-type triode, the base of the second triode Q2 is connected to the middle end of the fifth voltage division circuit, the emitting electrode of the second triode Q2 is grounded, and the collecting electrode of the second triode Q2 is connected to the output end of the bidirectional overrun protection circuit.
A capacitor C11 is arranged between the non-inverting input terminal of the third comparator OP3 and the ground, a capacitor C12 is arranged between the inverting input terminal of the fourth comparator OP4 and the ground, and a capacitor C13 is respectively connected between the base of the second triode Q2 and the ground.
The base of the first triode Q1 is connected with the output end of the third comparator OP3 through a resistor R19, the base of the first triode Q1 is connected with the output end of the fourth comparator OP4 through a resistor R20, and the inverting input end of the third comparator OP3 is connected with the output end of the electric signal acquisition circuit through a resistor R13. Meanwhile, the non-inverting input terminal of the fourth comparator OP4 is connected to the output terminal of the electrical signal acquisition circuit through a resistor R16.
The input end of the bidirectional overrun protection circuit is connected with the output end of the electric signal acquisition circuit, the third comparator OP3 carries out negative overrun protection comparison on the real-time current value I or the real-time voltage value U, the fourth comparator OP4 carries out positive overrun protection comparison on the real-time current value I or the real-time voltage value U, and when the negative overrun or the positive overrun protection is carried out, the first triode Q1 is triggered to be conducted, and then the second triode Q2 is triggered to output a protection driving signal.
As described above, the invention alarms and protects when any one of the effective value or the absolute value exceeds the set value by monitoring and calculating the electric signal value on the line in software and comparing the electric signal value with the set value, and simultaneously, the invention can send out early warning and protect processing in time by the bidirectional overrun protection circuit through the primary bidirectional overrun protection in hardware when overcurrent or overvoltage occurs.
For example, if the effective value of the current is limited, the effective value of the current calculated by software is compared with a set value to determine whether to protect. Meanwhile, an absolute value threshold can be calculated according to the effective value threshold, any data exceeds the absolute value threshold, the protection strategy is started immediately, and the protection speed is high. In addition, after one-stage bidirectional overrun protection is added on hardware, short-circuit overcurrent can be protected more quickly.
It will be appreciated that the overvoltage may also be margin protected by this bi-directional over-limit protection circuit.
In conclusion, the invention can remotely monitor the electric signal on the distribution box, and is convenient for terminal monitoring and control; meanwhile, through improvement of a software algorithm, threshold judgment is carried out according to the collected signals, and when the effective value or the instantaneous value of any electric signal exceeds the limit, early warning and protection processing are carried out; furthermore, through the improvement of hardware, when overcurrent or overvoltage occurs, early warning can be timely sent out through the bidirectional overrun protection circuit and protection processing is carried out, so that double protection of software and hardware is realized, and the safety of line power utilization is improved.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details shown and described herein without departing from the general concept defined by the claims and their equivalents.
Claims (8)
1. The electric safety early warning method for the intelligent distribution box is characterized by comprising the following steps of:
step one, acquiring a real-time current value I on an incoming line of a distribution box, and calculating a current effective value Ia;
step two, acquiring a real-time voltage value U on an inlet wire of a distribution box, and calculating a voltage effective value Ua;
setting an absolute threshold of a real-time current value I and an absolute threshold of a real-time voltage value U, and setting an effective threshold of a current effective value Ia and an effective threshold of a voltage effective value Ua;
fourthly, carrying out overcurrent protection early warning on the real-time current value I and the current effective value Ia, carrying out overcurrent protection when the real-time current value I or the current effective value Ia exceeds a corresponding threshold value, cutting off a power supply, and sending out early warning;
or carrying out overvoltage protection early warning on the real-time voltage value U and the effective voltage value Ua, and carrying out overvoltage protection, cutting off a power supply and sending out early warning when the real-time voltage value U and the effective voltage value Ua exceed corresponding threshold values;
fifthly, performing bidirectional overrun protection early warning on the electric signals on the line;
constructing an electrical signal acquisition circuit comprising:
the voltage divider comprises a plurality of voltage divider resistors connected in series, wherein the first voltage divider resistor is connected with a live wire incoming line end, the last voltage divider resistor is connected with a non-inverting input end of a first comparator, and the output end of the first comparator is connected with a voltage acquisition end;
a first end of the voltage sampling resistor is connected with a non-inverting input end of the first comparator, a second end of the voltage sampling resistor is connected with a first power end, and the first power end is connected with a zero line incoming line end;
a first voltage divider circuit comprising two resistors connected in series, wherein a first end of the first voltage divider circuit is connected to a first power supply terminal, a second end of the first voltage divider circuit is connected to an output terminal of the first comparator, and a middle end of the first voltage divider circuit is connected to an inverting input terminal of the first comparator;
the current sampling resistor is connected with the in-phase input end of a second comparator and one end of an external load at a first end, the other end of the external load is connected to the live wire incoming line end, the second end of the current sampling resistor is connected with the zero line incoming line end, and the output end of the second comparator is connected to the current acquisition end;
a second voltage division circuit, including two resistors connected in series, wherein a first end of the second voltage division circuit is connected to a first power supply terminal, a second end of the second voltage division circuit is connected to an output terminal of the second comparator, and a middle end of the second voltage division circuit is connected to an inverting input terminal of the second comparator;
constructing a bidirectional overrun protection circuit, the bidirectional overrun protection circuit comprising:
the inverting input end of the third comparator is connected with the current signal or voltage signal end, and the non-inverting input end of the third comparator is connected with the middle of a third voltage division circuit;
the non-inverting input end of the fourth comparator is connected with the current signal or voltage signal end, and the inverting input end of the fourth comparator is connected with the middle of a fourth voltage-dividing circuit;
the base electrode of the first triode is respectively connected with the output ends of the third comparator and the fourth comparator, the collector electrode of the first triode is connected with the first end of a fifth voltage-dividing circuit, and the second end of the fifth voltage-dividing circuit is grounded; and
and the base electrode of the second triode is connected to the middle end of the fifth voltage division circuit, the emitting electrode of the second triode is grounded, and the collecting electrode of the second triode is connected to the output end of the bidirectional overrun protection circuit.
2. The electricity safety precaution method for intelligent distribution box according to claim 1, characterized in that the power supply terminals of said first to fourth comparators are connected to a second power supply terminal, the voltage value of said first power supply terminal is half of the voltage value of said second power supply terminal, and the emitter of said first triode is connected to said second power supply terminal.
3. The electricity safety early warning method for the intelligent distribution box according to claim 2, wherein a/D sampling is performed on a real-time current, and the calculation method of the real-time current value I is as follows:
I＝(IAD/X*VCC-VCC/2)/(1+R3/R2)/Ris；
wherein, X is the full scale numerical value of A/D, the instant A/D data of the current is IAD, VCC is the voltage value of the second power supply, Ris is the current sampling resistor, and R3 and R2 are two resistors in the second voltage division circuit.
4. The electricity safety early warning method for the intelligent distribution box according to claim 3, wherein A/D sampling is performed on real-time voltage, and the calculation method of the real-time voltage value U is as follows:
U＝(UAD/X*VCC-VCC/2)/(1+R11/R10)*(R5+R6+R7+R8+R9)/R9；
the real-time A/D data of the voltage is UAD, VCC is a voltage value of the second power supply terminal, R9 is a voltage sampling resistor, R11 and R10 are two resistors in a first voltage division circuit, and R5, R6, R7 and R8 are the voltage division resistors.
5. The electric safety early warning method for the intelligent distribution box according to claim 4, wherein in the first step, the calculation method of the current effective value Ia comprises the following steps:
the calculation method of the voltage effective value Ua comprises the following steps:
the number of data acquired In one period of A/D is N, N is 1,2,3 … N, In is the nth real-time current value acquired In one period, and Un is the nth real-time voltage value acquired In one period.
6. The electricity safety early warning method for the intelligent distribution box according to claim 5, wherein an input end of the bidirectional overrun protection circuit is connected with an output end of the electric signal acquisition circuit, the third comparator performs negative overrun protection comparison on the real-time current value I or the real-time voltage value U, the fourth comparator performs positive overrun protection comparison on the real-time current value I or the real-time voltage value U, and when the negative overrun or the positive overrun protection is performed, the first triode is triggered to be conducted, and then the second triode is triggered to output a protection driving signal.
7. The electric safety early warning method for the intelligent distribution box according to claim 6, wherein a capacitor is respectively connected between a non-inverting input terminal of the third comparator and the ground wire, between an inverting input terminal of the fourth comparator and the ground wire, and between a base of the second triode and the ground wire.
8. The electrical safety early warning method for the intelligent distribution box according to claim 7, wherein the base of the first triode is connected to the output terminals of the third comparator and the fourth comparator through a resistor, respectively, and the inverting input terminal of the third comparator and the non-inverting input terminal of the fourth comparator are connected to the output terminal of the electrical signal acquisition circuit through a resistor, respectively.
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)
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109638967A CN109638967A (en) | 2019-04-16 |
| CN109638967B true CN109638967B (en) | 2021-03-23 |
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| CN101534012B (en) * | 2009-04-13 | 2011-06-15 | 温州市亿德科技有限公司 | Intelligent integrated comprehensive low-pressure distribution box |
| CA2901975C (en) * | 2013-03-13 | 2017-11-28 | Aspin Kemp & Associates Holding Corp. | Breaker design for power system resiliency |
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