CN113625100B - Method for detecting voltage loss of user terminal - Google Patents
Method for detecting voltage loss of user terminal Download PDFInfo
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- CN113625100B CN113625100B CN202110692616.XA CN202110692616A CN113625100B CN 113625100 B CN113625100 B CN 113625100B CN 202110692616 A CN202110692616 A CN 202110692616A CN 113625100 B CN113625100 B CN 113625100B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000005070 sampling Methods 0.000 claims abstract description 10
- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 238000001514 detection method Methods 0.000 claims abstract description 5
- 238000002955 isolation Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 4
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention relates to the technical field of power transmission line detection, in particular to a circuit method for detecting voltage loss of a user side, which comprises a circuit and is characterized in that: the circuit comprises a voltage and current sampling circuit, a comparison circuit and a protection circuit, wherein the voltage and current sampling circuit is mainly used for collecting voltage and current of a user terminal system, the comparison circuit is mainly used for comparing voltage and current relations under different load conditions, the larger the load current is, the larger the voltage drop of the system is, the smaller the load current of the system is, the higher the voltage of the user terminal is, and the protection circuit is mainly used for detecting that when the voltage of the user terminal is lower than a certain value under a certain load current condition, the rear alarm is started and information uploading is carried out; the method has the advantages of low cost, simplicity, reliability and accurate measurement, can detect whether the voltage drop of the circuit exceeds the specified range, and can start the protection circuit at the rear part to protect the safety of electric equipment at the rear part if the voltage drop exceeds the specified range.
Description
Technical Field
The invention relates to the technical field of power transmission line detection, in particular to a method for detecting voltage loss of a user side.
Background
Because the reactance exists in the transmission line, when the transmission line passes through the current, voltage drop is generated on the line, under normal conditions, the voltage drop of the line is within a certain range under the condition of passing normal rated load, but along with the running of the line, the ageing phenomenon exists on the line, the resistance reactance can be increased, meanwhile, because the long-time running of the line joint also exists, the contact resistance of the joint part is increased, the voltage drop of the line can be increased, the voltage drop can lead the voltage drop of a user terminal to be greatly reduced under serious conditions and can not be used, even the phenomenon of accident can be caused, the damage is extremely large, and the detection of the voltage drop is always a technical problem which needs to be solved urgently.
Disclosure of Invention
The invention aims to solve the technical problems of the prior art, and provides a method for detecting the voltage loss of the user end, which has the advantages of low cost, simplicity, reliability and accurate measurement, can detect whether the line voltage drop exceeds a specified range under the condition of corresponding current according to the load current and the corresponding line voltage drop, and can start a rear protection circuit to protect the safety of electric equipment at the rear once the line voltage drop exceeds the specified range.
In order to solve the technical problems, the invention adopts the following technical scheme: the method for detecting the voltage loss of the user terminal comprises a circuit and is characterized in that: the circuit comprises a voltage and current sampling circuit, a comparison circuit and a protection circuit, wherein the voltage and current sampling circuit is mainly used for collecting voltage and current of a user terminal system, the comparison circuit is mainly used for comparing voltage and current relations under different load conditions, the larger the load current is, the larger the voltage drop of the system is, the smaller the load current of the system is, the higher the voltage of the user terminal is, and the protection circuit is mainly used for detecting that when the voltage of the user terminal is lower than a certain value under a certain load current condition, the rear alarm is started and information uploading is carried out.
The circuit method comprises the following steps:
the first step: the high-voltage high-current signal is linearly converted into a low-voltage low-current signal through a mutual inductor TV and a mutual inductor TA; the secondary side of the voltage transformer TV is connected with the resistors R1-R3 to perform voltage division, the low-voltage signal is converted into an alternating current signal with the peak value of plus or minus 3V, the secondary side of the current transformer TA is connected with the resistors R7-R9 to convert the current signal into a voltage signal, and meanwhile the converted voltage signal is divided, so that the voltage transformer TA is suitable for the voltage amplitude requirement of a rear circuit.
And a second step of: the two voltage and current signals are still alternating current signals at the moment, direct current voltage signals are led out from the middle of RW1, R6 and RW2, R12 for the acquisition requirement of a rear circuit, and are overlapped on the front alternating current voltage and current signals, so that the alternating current signals are lifted to be above zero points and are converted into direct current signals.
And a third step of: under normal conditions, the voltage at the "+" polarity end of the op-amp UC1A is higher than the "-" polarity end, and at this time, the output end of UC1A is at high level.
Fourth step: then, the voltage at the "-" polarity terminal of the comparator UC1B is higher than the "+" polarity terminal, so that the comparator UC1B outputs a low level, and the protection circuit at the rear part is not operated. The voltage drop action threshold value of the circuit can be adjusted by adjusting the adjustable resistor RW3 and the resistor R15 connected to the polar end of the comparator UC1B "+".
Fifth step: when the line voltage drop exceeds the set range, the voltage at the "+" polarity end of the op-amp UC1A is lower than the "-" polarity end, and at this time, the output end of UC1A is at a low level.
Sixth step: then, the voltage at the "-" polarity terminal of the comparator UC1B is lower than the "+" polarity terminal, so that the comparator UC1B outputs a high level, and the rear protection circuit operates.
Further speaking: the detection method realizes mutual isolation with a high-voltage circuit through a transformer, and voltage and current collection is realized through a voltage dropping resistor and a current sampling resistor on the secondary side of the transformer respectively.
Further speaking: the circuit voltage threshold can be set arbitrarily according to the actual condition of the power transmission line.
Further speaking: after the voltage drop of the circuit exceeds the specified range, the circuit can start the protection circuit to cut off the electric equipment at the rear part and protect the safety of the equipment.
Further speaking: aiming at the alternating current acquisition signals, the circuit converts the positive and negative alternating signals into direct current signals in order to accurately realize the acquisition and comparison of the signals, so that the circuit is simpler and more reliable.
The beneficial effects of the invention are as follows: the method for detecting the voltage loss of the user side has the advantages of low cost, simplicity, reliability, accurate measurement, capability of detecting whether the circuit voltage drop exceeds a specified range under the condition of corresponding current according to the load current and the corresponding circuit voltage drop, and starting a protection circuit at the rear part to protect the safety of electric equipment at the rear part once the circuit voltage drop exceeds the specified range.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Description of the embodiments
The present invention will be described in further detail with reference to examples.
As shown in fig. 1: the method for detecting the voltage loss of the user terminal comprises a circuit and is characterized in that: the circuit comprises a voltage and current sampling circuit, a comparison circuit and a protection circuit, wherein the voltage and current sampling circuit is mainly used for collecting voltage and current of a user terminal system, the comparison circuit is mainly used for comparing voltage and current relations under different load conditions, the larger the load current is, the larger the voltage drop of the system is, the smaller the load current of the system is, the higher the voltage of the user terminal is, and the protection circuit is mainly used for detecting that when the voltage of the user terminal is lower than a certain value under a certain load current condition, the rear alarm is started and information uploading is carried out.
The implementation method is as follows: firstly, a high-voltage large-current signal is linearly converted into a low-voltage small-current signal through a mutual inductor TV and a mutual inductor TA; the secondary side of the voltage transformer TV is connected with the resistors R1-R3 to perform voltage division, the low-voltage signal is converted into an alternating current signal with the peak value of plus or minus 3V, the secondary side of the current transformer TA is connected with the resistors R7-R9 to convert the current signal into a voltage signal, and meanwhile the converted voltage signal is divided, so that the voltage transformer TA is suitable for the voltage amplitude requirement of a rear circuit. The two voltage and current signals are still alternating current signals at the moment, direct current voltage signals are led out from the middle of RW1, R6 and RW2, R12 for the acquisition requirement of a rear circuit, and are overlapped on the front alternating current voltage and current signals, so that the alternating current signals are lifted to be above zero points and are converted into direct current signals.
Under normal conditions, the voltage at the "+" polarity end of the op-amp UC1A is higher than the "-" polarity end, and at this time, the output end of UC1A is at high level. Then, the voltage at the "-" polarity terminal of the comparator UC1B is higher than the "+" polarity terminal, so that the comparator UC1B outputs a low level, and the protection circuit at the rear part is not operated. The voltage drop action threshold value of the circuit can be adjusted by adjusting the adjustable resistor RW3 and the resistor R15 connected to the polar end of the comparator UC1B "+".
When the line voltage drop exceeds the set range, the voltage at the "+" polarity end of the op-amp UC1A is lower than the "-" polarity end, and at this time, the output end of UC1A is at a low level. Then, the voltage at the "-" polarity terminal of the comparator UC1B is lower than the "+" polarity terminal, so that the comparator UC1B outputs a high level, and the rear protection circuit operates.
The method for detecting the voltage loss of the user side has the advantages of low cost, simplicity, reliability, accurate measurement, capability of detecting whether the circuit voltage drop exceeds a specified range under the condition of corresponding current according to the load current and the corresponding circuit voltage drop, and starting a protection circuit at the rear part to protect the safety of electric equipment at the rear part once the circuit voltage drop exceeds the specified range.
The above description is only of the preferred embodiments of the present invention, and is not intended to limit the present invention. Any simple modification, variation and equivalent variation of the above embodiments according to the technical substance of the invention still fall within the scope of the technical solution of the invention.
Claims (4)
1. The method for detecting the voltage loss of the user terminal comprises a circuit and is characterized in that: the circuit comprises a voltage and current sampling circuit, a comparison circuit and a protection circuit, wherein the voltage and current sampling circuit is mainly used for collecting voltage and current of a user terminal system, the comparison circuit is mainly used for comparing voltage and current relations under different load conditions, the larger the load current is, the larger the voltage drop of the system is, the smaller the load current of the system is, the higher the voltage of the user terminal is, and the protection circuit is mainly used for detecting that when the voltage of the user terminal is lower than a certain value under a certain load current condition, the rear alarm is started and information uploading is carried out; the circuit method comprises the following steps:
the first step: the high-voltage high-current signal is linearly converted into a low-voltage low-current signal through a mutual inductor TV and a mutual inductor TA; the secondary side of the voltage transformer TV is connected with resistors R1-R3 to perform voltage division, the low-voltage signal is converted into an alternating current signal with a peak value of plus or minus 3V, the secondary side of the current transformer TA is connected with resistors R7-R9 to convert the current signal into a voltage signal, and meanwhile the converted voltage signal is divided, so that the voltage transformer TA is suitable for the voltage threshold requirement of a rear circuit;
and a second step of: the two voltage and current signals are still alternating current signals at the moment, direct current voltage signals are led out from the middle of RW1, R6 and RW2 and R12 for the acquisition requirement of a rear circuit, and are superposed on the alternating current voltage and current signals at the front side, so that the alternating current signals are lifted to be above zero, and are converted into direct current signals;
and a third step of: under normal conditions, the voltage of the "+" polarity end of the operational amplifier UC1A is higher than that of the "-" polarity end, and at the moment, the output end of the UC1A is at a high level;
fourth step: then the voltage at the "-" polarity end of the comparator UC1B is higher than the "+" polarity end, so that the comparator UC1B outputs a low level, and a protection circuit at the rear part does not act, and the adjustable resistor RW3 and the resistor R15 connected to the "+" polarity end of the comparator UC1B are used for adjusting the adjustable resistor RW3, so that the voltage drop action threshold value of the circuit can be adjusted;
fifth step: when the line voltage drop exceeds the set range, the voltage of the "+" polarity end of the operational amplifier UC1A is lower than the "-" polarity end, and at the moment, the output end of the UC1A is at a low level;
sixth step: then, the voltage at the "-" polarity terminal of the comparator UC1B is lower than the "+" polarity terminal, so that the comparator UC1B outputs a high level, and the rear protection circuit operates.
2. The method for detecting voltage loss at a client according to claim 1, wherein: the detection method realizes mutual isolation with the high-voltage circuit through the transformer, and the voltage and current are collected through the voltage dropping resistor and the current sampling resistor on the secondary side of the transformer.
3. The method for detecting voltage loss at a client according to claim 1, wherein: the circuit voltage threshold is set arbitrarily according to the actual transmission line condition.
4. The method for detecting voltage loss at a client according to claim 1, wherein: after the voltage drop of the circuit exceeds the specified range, the circuit starts the protection circuit, cuts off the electric equipment at the rear part and protects the safety of the equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110692616.XA CN113625100B (en) | 2021-06-22 | 2021-06-22 | Method for detecting voltage loss of user terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110692616.XA CN113625100B (en) | 2021-06-22 | 2021-06-22 | Method for detecting voltage loss of user terminal |
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| CN113625100A CN113625100A (en) | 2021-11-09 |
| CN113625100B true CN113625100B (en) | 2024-01-12 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005300295A (en) * | 2004-04-09 | 2005-10-27 | Matsushita Electric Ind Co Ltd | Dc voltage detecting circuit equipped with noise reduction processing function |
| CN101499644A (en) * | 2008-02-02 | 2009-08-05 | 华润矽威科技（上海）有限公司 | Under-voltage protection circuit with low starting current |
| CN102355046A (en) * | 2011-09-09 | 2012-02-15 | Tcl新技术（惠州）有限公司 | Voltage detection and power failure protection device and implementation method |
| CN202159973U (en) * | 2011-07-07 | 2012-03-07 | 天津市松正电动汽车技术股份有限公司 | Voltage detection protection circuit |
| WO2017167096A1 (en) * | 2016-03-28 | 2017-10-05 | 比亚迪股份有限公司 | Negative voltage detection circuit |
-
2021
- 2021-06-22 CN CN202110692616.XA patent/CN113625100B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005300295A (en) * | 2004-04-09 | 2005-10-27 | Matsushita Electric Ind Co Ltd | Dc voltage detecting circuit equipped with noise reduction processing function |
| CN101499644A (en) * | 2008-02-02 | 2009-08-05 | 华润矽威科技（上海）有限公司 | Under-voltage protection circuit with low starting current |
| CN202159973U (en) * | 2011-07-07 | 2012-03-07 | 天津市松正电动汽车技术股份有限公司 | Voltage detection protection circuit |
| CN102355046A (en) * | 2011-09-09 | 2012-02-15 | Tcl新技术（惠州）有限公司 | Voltage detection and power failure protection device and implementation method |
| WO2017167096A1 (en) * | 2016-03-28 | 2017-10-05 | 比亚迪股份有限公司 | Negative voltage detection circuit |
Non-Patent Citations (1)
| Title |
|---|
| 基于模拟电路的自复式过欠压保护器设计与实现;易先君;;电器与能效管理技术(08);全文 * |
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