CN113625100A - User side voltage loss detection circuit method - Google Patents
User side voltage loss detection circuit method Download PDFInfo
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- CN113625100A CN113625100A CN202110692616.XA CN202110692616A CN113625100A CN 113625100 A CN113625100 A CN 113625100A CN 202110692616 A CN202110692616 A CN 202110692616A CN 113625100 A CN113625100 A CN 113625100A
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- 238000001514 detection method Methods 0.000 title claims abstract description 8
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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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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 the voltage and current of a user end system, the comparison circuit is mainly used for comparing the relation between the voltage and the current under different load conditions, the larger the load current is, the larger the voltage drop of the system is, and conversely, the smaller the load current of the system is, the higher the voltage of the user end is, and the protection circuit is mainly used for detecting that when the voltage of the user end is lower than a certain value under the condition of certain load current, the rear part alarm is started and the information is uploaded; the method has the advantages of low cost, simplicity, reliability, accurate measurement, capability of detecting whether the voltage drop of the line exceeds a specified range, starting a rear protection circuit if the voltage drop exceeds the specified range, and protecting the safety of rear electric equipment.
Description
Technical Field
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.
Background
Because the electric transmission line has reactance, when the electric transmission line passes through current, voltage drop can be generated on the line, under the normal condition, under the condition of passing through normal rated load, the voltage drop of the line is within a certain range, but along with the operation of the line, the line has an aging phenomenon, the resistance reactance can be increased, and meanwhile, because of the long-time operation of a line joint, the contact resistance of the joint part is also increased, so that the line voltage drop can be increased, the voltage drop can cause the phenomenon that the voltage of a user terminal is greatly reduced and cannot be used under the serious condition, even accidents can be caused, the damage is extremely large, and the detection of the voltage drop is a technical problem which needs to be solved urgently all the time.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a user side voltage loss detection circuit method, which has the advantages of low cost, simplicity, reliability, accurate measurement, and capability of detecting whether the line voltage drop exceeds the specified range under the corresponding current condition according to the load current and the corresponding line voltage drop, and starting the rear protection circuit to protect the rear power consumption equipment from being safe once the line voltage drop exceeds the specified range.
In order to solve the technical problems, the invention adopts the technical scheme that: a method for detecting a voltage loss of a 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 end system, the comparison circuit is mainly used for comparing the relation between the voltage and the current under different load conditions, the larger the load current is, the larger the voltage drop of the system is, and conversely, the smaller the load current of the system is, the higher the voltage of the user end is, and the protection circuit is mainly used for detecting that when the voltage of the user end is lower than a certain value under the condition of certain load current, the rear part alarm is started and information is uploaded.
The circuit method comprises the following steps:
the first step is as follows: high-voltage and high-current signals are linearly converted into low-voltage and low-current signals through transformers TV and TA; the secondary side access resistor R1-R3 of the voltage transformer TV plays a role in voltage division, low-voltage signals are converted into alternating-current signals with positive and negative 3V peak values, the secondary side access resistor R7-R9 of the current transformer TA converts the current signals into voltage signals, and the converted voltage signals are divided, so that the voltage transformer TV is suitable for the voltage amplitude requirement of a rear circuit.
The second step is that: the two voltage and current signals are still alternating current signals at this time, and for the requirement of rear circuit acquisition, direct current voltage signals are led out from the middle of the RW1, the R6, the RW2 and the R12, and are superposed on the front alternating current voltage and current signals, so that the alternating current signals are raised above a zero point and are converted into direct current signals.
The third step: under normal line voltage drop, the voltage at the + polarity end of the operational amplifier UC1A is higher than the voltage at the-polarity end, and at this time, the output end of UC1A is at high level.
The fourth step: then, the voltage at the "+" polarity end of the comparator UC1B is higher than that at the "+" polarity end, so that the comparator UC1B outputs a low level, and the rear protection circuit does not operate. The adjustable resistor RW3 and the resistor R15 connected to the + polarity end of the comparator UC1B, and the line drop action threshold can be adjusted by adjusting the adjustable resistor RW 3.
The fifth step: when the line voltage drop is beyond the set range, the voltage at the "+" polarity end of the operational amplifier UC1A is lower than the "-" polarity end, and at this time, the output end of UC1A is at low level.
And a sixth step: then, the voltage at the "+" polarity terminal of the comparator UC1B is lower than that at the "+" polarity terminal, so that the comparator UC1B outputs a high level, and the rear protection circuit operates.
Further speaking: the detection circuit is isolated from the high-voltage circuit through a mutual inductor, and voltage and current are collected on the secondary side of the mutual inductor through a voltage reduction resistor and a current sampling resistor respectively.
Further speaking: the threshold value of the voltage judgment can be set arbitrarily according to the actual power transmission line condition.
Further speaking: when the voltage drop exceeds the specified range, the circuit can start the protection circuit to cut off the rear electric equipment, so that the safety of the equipment is protected.
Further speaking: aiming at the alternating current acquisition signal, in order to accurately realize the acquisition and comparison of the signal, the circuit realizes the conversion of the positive and negative alternating signals into the direct current signal, so that the circuit is simpler and more reliable.
The invention has the beneficial effects that: the method for detecting the voltage loss of the user side has the advantages of low cost, simplicity, reliability and accurate measurement, and can detect whether the line voltage drop exceeds a specified range under the condition of corresponding current according to the magnitude of load current and the corresponding line voltage drop, and once the line voltage drop exceeds the specified range, a rear protection circuit can be started to protect rear electric equipment.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples.
As shown in fig. 1: a method for detecting a voltage loss of a 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 end system, the comparison circuit is mainly used for comparing the relation between the voltage and the current under different load conditions, the larger the load current is, the larger the voltage drop of the system is, and conversely, the smaller the load current of the system is, the higher the voltage of the user end is, and the protection circuit is mainly used for detecting that when the voltage of the user end is lower than a certain value under the condition of certain load current, the rear part alarm is started and information is uploaded.
The implementation method comprises the following steps: firstly, high-voltage and high-current signals are linearly converted into low-voltage and low-current signals through transformers TV and TA; the secondary side access resistor R1-R3 of the voltage transformer TV plays a role in voltage division, low-voltage signals are converted into alternating-current signals with positive and negative 3V peak values, the secondary side access resistor R7-R9 of the current transformer TA converts the current signals into voltage signals, and the converted voltage signals are divided, so that the voltage transformer TV is suitable for the voltage amplitude requirement of a rear circuit. The two voltage and current signals are still alternating current signals at this time, and for the requirement of rear circuit acquisition, direct current voltage signals are led out from the middle of the RW1, the R6, the RW2 and the R12, and are superposed on the front alternating current voltage and current signals, so that the alternating current signals are raised above a zero point and are converted into direct current signals.
Under normal line voltage drop, the voltage at the + polarity end of the operational amplifier UC1A is higher than the voltage at the-polarity end, and at this time, the output end of UC1A is at high level. Then, the voltage at the "+" polarity end of the comparator UC1B is higher than that at the "+" polarity end, so that the comparator UC1B outputs a low level, and the rear protection circuit does not operate. The adjustable resistor RW3 and the resistor R15 connected to the + polarity end of the comparator UC1B, and the line drop action threshold can be adjusted by adjusting the adjustable resistor RW 3.
When the line voltage drop is beyond the set range, the voltage at the "+" polarity end of the operational amplifier UC1A is lower than the "-" polarity end, and at this time, the output end of UC1A is at low level. Then, the voltage at the "+" polarity terminal of the comparator UC1B is lower than that at 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 and accurate measurement, and can detect whether the line voltage drop exceeds a specified range under the condition of corresponding current according to the magnitude of load current and the corresponding line voltage drop, and once the line voltage drop exceeds the specified range, a rear protection circuit can be started to protect rear electric equipment.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (5)
1. A method for detecting a voltage loss of a 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 the voltage and current of a user end system, the comparison circuit is mainly used for comparing the relation between the voltage and the current under different load conditions, the larger the load current is, the larger the voltage drop of the system is, and conversely, the smaller the load current of the system is, the higher the voltage of the user end is, and the protection circuit is mainly used for detecting that when the voltage of the user end is lower than a certain value under the condition of certain load current, the rear part alarm is started and the information is uploaded; the circuit method comprises the following steps:
the first step is as follows: high-voltage and high-current signals are linearly converted into low-voltage and low-current signals through transformers TV and TA; the secondary side of the voltage transformer TV is connected with resistors R1-R3 to play a role in voltage division and convert low-voltage signals into alternating-current signals with positive and negative 3V peak values, the secondary side of the current transformer TA is connected with resistors R7-R9 to convert current signals into voltage signals, and the converted voltage signals are divided, so that the voltage amplitude requirement of a rear circuit is met;
the second step is that: the two voltage and current signals are still alternating current signals at the moment, and for the requirement of rear circuit acquisition, direct current voltage signals are led out from the middle parts of RW1, R6, RW2 and R12 and are superposed on the alternating current voltage and current signals at the front side, so that the alternating current signals are raised to be above a zero point and are converted into direct current signals;
the third step: under normal line voltage drop, the voltage of the + polarity end of the operational amplifier UC1A is higher than the-polarity end, and at this time, the output end of UC1A is at high level;
the fourth step: then, the voltage at the "+" polarity end of the comparator UC1B is higher than that at the "+" polarity end, so that the comparator UC1B outputs a low level, and the rear protection circuit does not operate. An adjustable resistor RW3 and a resistor R15 which are connected with the polarity end of the comparator UC1B '+', and the voltage drop action threshold of the line can be adjusted by adjusting the adjustable resistor RW 3;
the 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 this time, the output end of UC1A is at low level;
and a sixth step: then, the voltage at the "+" polarity terminal of the comparator UC1B is lower than that at the "+" polarity terminal, so that the comparator UC1B outputs a high level, and the rear protection circuit operates.
2. The method of claim 1, wherein the method further comprises: the detection circuit is isolated from the high-voltage circuit through a mutual inductor, and voltage and current are collected on the secondary side of the mutual inductor through a voltage reduction resistor and a current sampling resistor respectively.
3. The method of claim 1, wherein the method further comprises: the threshold value of the voltage judgment can be set arbitrarily according to the actual power transmission line condition.
4. The method of claim 1, wherein the method further comprises: when the voltage drop exceeds the specified range, the circuit can start the protection circuit to cut off the rear electric equipment, so that the safety of the equipment is protected.
5. The method of claim 1, wherein the method further comprises: aiming at the alternating current acquisition signal, in order to accurately realize the acquisition and comparison of the signal, the circuit realizes the conversion of the positive and negative alternating signals into the direct current signal, so that the circuit is simpler and more reliable.
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 true CN113625100A (en) | 2021-11-09 |
| CN113625100B 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 |
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| 易先君;: "基于模拟电路的自复式过欠压保护器设计与实现", 电器与能效管理技术 * |
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