CN108508258B - Monitoring system - Google Patents
Monitoring system Download PDFInfo
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- CN108508258B CN108508258B CN201710111838.1A CN201710111838A CN108508258B CN 108508258 B CN108508258 B CN 108508258B CN 201710111838 A CN201710111838 A CN 201710111838A CN 108508258 B CN108508258 B CN 108508258B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 29
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 230000005611 electricity Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 description 15
- 230000000694 effects Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention discloses a monitoring system, relates to the field of electrical equipment, and achieves the aim of providing a low-cost and easy-to-implement current monitoring system with high accuracy. The main technical scheme of the invention is as follows: a monitoring system, comprising: an apparatus; the conversion part comprises a current transformer and a current transducer, one end of the current transformer is connected with the equipment, the other end of the current transformer is connected with the current transducer, the current transformer is used for outputting the current of the equipment to the current transducer in a current reducing way, and the current transducer is used for secondarily reducing the current; and the receiving part is connected with the current transducer and is used for receiving the output current of the current transducer. The invention is mainly used for monitoring the operation of equipment.
Description
Technical Field
The invention relates to the field of electrical equipment, in particular to a monitoring system.
Background
Remote current monitoring technology of power equipment is used in electric automation systems of various industries, but current monitoring instruments are more and more distant from a power distribution device due to the fact that modern large-scale industries are more and more large. The cable length between the current detection instrument and the distribution device is prolonged to hundreds of meters or even longer from tens of meters or tens of meters, the cable impedance is greatly increased, the finally monitored current value is greatly deviated, and the purpose of current monitoring cannot be achieved.
In the prior art, the electrical loss of the cable has a direct relation with the resistance, so that the electrical loss of the cable is reduced by selecting a mode of reducing the resistance, and the size of the resistance of the cable is related to the material, the length, the cross-sectional area and the temperature, and the working environment temperature is stable due to the fact that the length of the cable is stable, so that the cable is mainly changed in material selection and the cross-sectional area, but the cable is made of a material with low resistivity or thickened, and the cable needs more cost, and the cable is not practical for production. Thus, there is a need for a cost-effective way to increase the accuracy of current monitoring.
Disclosure of Invention
In view of the above, the embodiment of the present invention provides a monitoring system, and mainly aims to provide a low-cost, easy-to-implement and high-accuracy current monitoring system.
In order to achieve the above purpose, the present invention mainly provides the following technical solutions:
in one aspect, an embodiment of the present invention provides a monitoring system, including:
an apparatus;
The conversion part comprises a current transformer and a current transducer, one end of the current transformer is connected with the equipment, the other end of the current transformer is connected with the current transducer, the current transformer is used for outputting the current of the equipment to the current transducer in a current reducing way, and the current transducer is used for secondarily reducing the current;
And the receiving part is connected with the current transducer and is used for receiving the output current of the current transducer.
Further, the receiving section includes an ammeter.
Further, the receiving part further comprises a current sensor, one end of the current sensor is connected with the ammeter, the other end of the current sensor is connected with the equipment, and when the output current of the current transmitter exceeds the preset value of the current sensor, the current sensor adjusts the equipment.
Further, the receiving part further includes a PLC (i.e., programmable Logic Controller, a programmable logic controller), one end of the PLC is connected to the ammeter, the other end is connected to the device, and when the output current of the current transmitter exceeds the preset value of the PLC, the PLC adjusts the device.
Further, the receiving part comprises a digital-to-analog converter and a computer, one end of the digital-to-analog converter is connected with the computer, the other end of the digital-to-analog converter is connected with the current transducer, and the digital-to-analog converter converts the output current of the current transducer into a digital signal and transmits the digital signal to the computer.
Further, the current transmitter comprises an alarm which is connected with the receiving part, and when the output current of the current transmitter exceeds the preset value of the receiving part, the alarm is started; and when the output current of the current transmitter returns to the preset value of the receiving part, the alarm is closed.
Further, an air switch is provided between the apparatus and the converting part for protecting the converting part and the receiving part.
The embodiment of the invention provides a monitoring system, which comprises: an apparatus, a converting section, and a receiving section; the conversion part comprises a current transformer and a current transducer, one end of the current transformer is connected with the equipment, the other end of the current transformer is connected with the current transducer, the current transformer is used for reducing the current of the equipment and outputting the reduced current to the current transducer, and the current transducer is used for secondarily reducing the current; the receiving part is connected to the current transducer and is used for receiving the output current of the current transducer. In the prior art, since the electrical resistance is increased due to the increase of the cable, the electrical loss of the cable is increased, in order to obtain a more accurate measured value, a material with lower resistivity is generally selected to manufacture the cable, or the sectional area of the cable is increased, so that the electrical resistance of the cable is reduced, and the electrical loss is further reduced, but the production cost is greatly increased, and the cable cannot be widely applied to actual production. After the current transformer and the current transducer are used, high-voltage and high-current alternating current flowing through the equipment can be changed into common low-voltage alternating current by the current transformer, and finally the low-voltage and low-current direct current is converted into low-voltage and low-current direct current by the current transducer, and finally the output current of the current transducer is controlled to be 0 to 5 volts and 4 to 20 milliamperes, so that the voltage drop of the cable is small due to the small current, the electric loss is weak, the information of the receiving part is very accurate, and meanwhile, the system does not need to replace the cable on a large scale, so that the production cost can be effectively controlled. The invention can effectively monitor the running condition of the equipment, and can obtain good effect due to the accuracy of the data received by the receiving part no matter the invention is used for recording data or keeping the equipment in good running condition.
Drawings
FIG. 1 is a schematic diagram of a monitoring system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of another monitoring system according to an embodiment of the present invention.
Detailed Description
In order to further describe the technical means and effects adopted by the invention to achieve the preset aim, the following detailed description will refer to the specific implementation, structure, characteristics and effects of the monitoring system according to the invention with reference to the accompanying drawings and the preferred embodiments.
As shown in fig. 1, an embodiment of the present invention provides a monitoring system including:
An apparatus 1; the device 1 may be a motor or a water pump, and may be a different device 1 according to the requirements of plant monitoring, and the monitoring system may be used as long as the device 1 is powered.
A conversion unit 2 including a current transformer 21 and a current transducer 22, wherein one end of the current transformer 21 is connected to the device 1, and the other end is connected to the current transducer 22, the current transformer 21 is used for reducing the current of the device 1 and outputting the reduced current to the current transducer 22, and the current transducer 22 secondarily reduces the current; the current transformer 21 can be used for converting high-voltage and high-current alternating current output by the device 1 into low-voltage and low-current alternating current, but the current still causes a large voltage drop of the cable, so that the electrical loss on the cable is high. The current transducer 22 is used again, so that the low-voltage low-current alternating current output by the current transformer 21 can be converted again to be changed into low-voltage micro-current direct current, and finally the output current of the current transducer 22 is controlled to be 0 to 5 volts, 4 to 20 milliamperes.
And a receiving unit connected to the current transducer 22 for receiving an output current of the current transducer 22. Different ones of the above-described receptacles may be used according to different requirements.
The following describes the operation and principle of the monitoring system in this embodiment in detail:
The device 1 outputs high-voltage high-current alternating current, which is converted into low-voltage low-current alternating current by the current transformer 21, and is converted into low-voltage micro-current direct current by the current transformer 21, and the receiving part receives current signals by long-distance transmission.
The embodiment of the invention provides a monitoring system, which comprises: an apparatus, a converting section, and a receiving section; the conversion part comprises a current transformer and a current transducer, one end of the current transformer is connected with the equipment, the other end of the current transformer is connected with the current transducer, the current transformer is used for reducing the current of the equipment and outputting the reduced current to the current transducer, and the current transducer is used for secondarily reducing the current; the receiving part is connected to the current transducer and is used for receiving the output current of the current transducer. In the prior art, since the electrical resistance is increased due to the increase of the cable, the electrical loss of the cable is increased, in order to obtain a more accurate measured value, a material with lower resistivity is generally selected to manufacture the cable, or the sectional area of the cable is increased, so that the electrical resistance of the cable is reduced, and the electrical loss is further reduced, but the production cost is greatly increased, and the cable cannot be widely applied to actual production. After the current transformer and the current transducer are used, high-voltage and high-current alternating current flowing through the equipment can be changed into common low-voltage alternating current by the current transformer, and finally the low-voltage and low-current direct current is converted into low-voltage and low-current direct current by the current transducer, and finally the output current of the current transducer is controlled to be 0 to volt to 0 milliamp, so that the voltage drop of the cable is small due to the small current, the electric loss is weak, the information of the receiving part is very accurate, and meanwhile, the system does not need to replace the cable on a large scale, so that the production cost can be effectively controlled. The invention can effectively monitor the running condition of the equipment, and can obtain good effect due to the accuracy of the data received by the receiving part no matter the invention is used for recording data or keeping the equipment in good running condition.
The invention is described in further detail below with reference to the drawings and examples.
For most cases, only the operation of the device 1 is to be checked, so that only a simple current indication is needed, and in particular the receiving part comprises the ammeter 3. Because the operation condition of the device 1 to be observed may need to observe a plurality of devices 1 according to the requirement, a plurality of monitoring systems may be used, at this time, the ammeter 3 may be centrally placed, so that the operator can conveniently look at the ammeter, and the operator does not need to patrol in the factory all the time.
Since the monitoring of the device 1 is to ensure that the device 1 is in a good working state, thereby ensuring production efficiency, and to be able to better regulate the device 1, specifically, the receiving portion further includes a current sensor 4, one end of the current sensor 4 is connected to the ammeter 3, the other end is connected to the device 1, and when the output current of the current transducer 22 exceeds the preset value of the current sensor 4, the current sensor 4 regulates the device 1. After the current sensor 4 is used, the working condition of the equipment 1 can be automatically adjusted without manual uninterrupted monitoring, so that the equipment 1 runs more intelligently, the working strength of workers is reduced, and meanwhile, the equipment 1 is regulated and controlled more rapidly without the need for the workers to go to a far place for operation.
In some cases, a plurality of different operations may be required according to the magnitude of the current received by the ammeter 3, and specifically, the receiving unit further includes a PLC (i.e., programmable Logic Controller, a programmable logic controller), one end of the PLC is connected to the ammeter 3, the other end is connected to the device 1, and when the output current of the current transmitter 22 exceeds the preset value of the PLC, the PLC adjusts the device 1. Because the PLC can perform programming and can process multiple sets of data simultaneously, the same PLC can be used for a plurality of devices 1, on one hand, the cost can be further reduced, on the other hand, the data can be displayed on the devices 1 which work in an abnormal state, due to the fact that due effect can not be obtained through adjustment, the abnormal operation of the devices 1 is possibly caused by another related device 1, and the other related device 1 can be adjusted through the judgment of the PLC, so that the devices 1 working in the abnormal state can work normally, the whole problem judgment is more intelligent, meanwhile, the judgment is quicker, and the adjustment of the devices 1 by manually running waves is not needed.
As shown in fig. 2, since the current is transmitted over a cable with an electric loss, and is transmitted over a long distance, even though the electric loss is weak, the final data is somewhat erroneous, and in order to make the error smaller, specifically, the receiving unit includes a digital-to-analog converter 5 and a computer 6, one end of the digital-to-analog converter 5 is connected to the computer 6, the other end is connected to the current transducer 22, and the digital-to-analog converter 5 converts the output current of the current transducer 22 into a digital signal and transmits the digital signal to the computer 6. The digital-to-analog converter 5 is arranged at a position far from the current transducer 22, so that the passing cable of the current output by the current transducer 22 is shorter, the electric loss is less, the analog signal of the current is converted into a digital signal through the digital-to-analog converter 5, and then the digital signal is transmitted through a long cable and is transmitted to the computer 6, and the digital signal cannot be weakened due to the length of the cable, so that the accuracy of the data received by the computer 6 can be more effectively ensured. Meanwhile, the computer 6 can continuously monitor and record the running condition of the equipment 1 in real time, and can realize intelligent adjustment by matching with programming, and can also lighten the workload of workers.
Since the problems with the apparatus 1 are endless, and the judgment and resolution of the receiving section is limited, in order to enable the staff to know the occurrence of the apparatus 1, the apparatus comprises an alarm connected to the receiving section, and activated when the output current of the current transducer 22 exceeds the preset value of the receiving section; when the output current of the current transducer 22 returns to the preset value of the receiving portion, the alarm is turned off. On the one hand, the device 1 can remind workers, and after automatic repair, the device 1 is subjected to analysis on fault reasons, fault time, fault frequency and the like, so that the device 1 is more comprehensively known, and on the other hand, when the receiving part can not solve the problem, the workers can get to the manual work to remove the problem even if the workers arrive, so that the device 1 can be put into normal work as soon as possible.
In order to prevent overload operation or short circuit of the device 1, an air switch is provided between the device 1 and the converting part 2 for protecting the converting part 2 and the receiving part. Because the current transducer 22 and the ammeter 3 can input limited current, the current transducer 22 and the ammeter 3 can be damaged by excessive current, and the current sensor 4 can be damaged by the relatively sensitive device such as the current sensor 4, when the air switch is used, the device 1 can be overloaded or the circuit is short-circuited, and the circuit is disconnected, so that the current transducer 22, the ammeter 3, the current sensor 4 and the like are protected, and meanwhile, the air switch can be reused, so that the production cost is further saved, and the maintenance cost is also saved.
The embodiment of the invention provides a monitoring system, which comprises: an apparatus, a converting section, and a receiving section; the conversion part comprises a current transformer and a current transducer, one end of the current transformer is connected with the equipment, the other end of the current transformer is connected with the current transducer, the current transformer is used for reducing the current of the equipment and outputting the reduced current to the current transducer, and the current transducer is used for secondarily reducing the current; the receiving part is connected to the current transducer and is used for receiving the output current of the current transducer. In the prior art, since the electrical resistance is increased due to the increase of the cable, the electrical loss of the cable is increased, in order to obtain a more accurate measured value, a material with lower resistivity is generally selected to manufacture the cable, or the sectional area of the cable is increased, so that the electrical resistance of the cable is reduced, and the electrical loss is further reduced, but the production cost is greatly increased, and the cable cannot be widely applied to actual production. After the current transformer and the current transducer are used, high-voltage and high-current alternating current flowing through the equipment can be changed into common low-voltage alternating current by the current transformer, and finally the low-voltage and low-current direct current is converted into low-voltage and low-current direct current by the current transducer, and finally the output current of the current transducer is controlled to be 0 to 5 volts and 4 to 20 milliamperes, so that the voltage drop of the cable is small due to the small current, the electric loss is weak, the information of the receiving part is very accurate, and meanwhile, the system does not need to replace the cable on a large scale, so that the production cost can be effectively controlled. The invention can effectively monitor the running condition of the equipment, and can obtain good effect due to the accuracy of the data received by the receiving part no matter the invention is used for recording data or keeping the equipment in good running condition.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (2)
1. A monitoring system, comprising:
the equipment needs electricity;
The conversion part comprises a current transformer and a current transducer, one end of the current transformer is connected with the equipment, the other end of the current transformer is connected with the current transducer, the current transformer is used for outputting the current of the equipment to the current transducer in a current reducing way, and the current transducer is used for secondarily reducing the current;
the receiving part is connected with the current transducer and is used for receiving the output current of the current transducer;
The receiving part comprises an ammeter;
The receiving part further comprises a current sensor, one end of the current sensor is connected with the ammeter, the other end of the current sensor is connected with the equipment, and when the output current of the current transmitter exceeds the preset value of the current sensor, the current sensor adjusts the equipment;
The receiving part also comprises a PLC (Programmable Logic Controller, a programmable logic controller), one end of the PLC is connected with the ammeter, the other end of the PLC is connected with the equipment, and when the output current of the current transmitter exceeds the preset value of the PLC, the PLC adjusts the equipment;
The receiving part comprises a digital-to-analog converter and a computer, one end of the digital-to-analog converter is connected with the computer, the other end of the digital-to-analog converter is connected with the current transducer, and the digital-to-analog converter converts the output current of the current transducer into a digital signal and transmits the digital signal to the computer;
The current transmitter comprises an alarm which is connected with the receiving part, and the alarm is started when the output current of the current transmitter exceeds the preset value of the receiving part; and when the output current of the current transmitter returns to the preset value of the receiving part, the alarm is closed.
2. The monitoring system of claim 1, further comprising an air switch disposed between the device and the converting portion for protecting the converting portion and the receiving portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710111838.1A CN108508258B (en) | 2017-02-28 | 2017-02-28 | Monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710111838.1A CN108508258B (en) | 2017-02-28 | 2017-02-28 | Monitoring system |
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| Publication Number | Publication Date |
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| CN108508258A CN108508258A (en) | 2018-09-07 |
| CN108508258B true CN108508258B (en) | 2024-05-17 |
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| CN201710111838.1A Active CN108508258B (en) | 2017-02-28 | 2017-02-28 | Monitoring system |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114675070A (en) * | 2022-03-29 | 2022-06-28 | 广州发展电力科技有限公司 | Motor remote current measuring system and measuring method |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000241466A (en) * | 1999-02-18 | 2000-09-08 | Hitachi Ltd | Small energy converter with split type current transformer |
| KR100721251B1 (en) * | 2005-12-02 | 2007-05-22 | 엘에스산전 주식회사 | Monitoring system of underground power line |
| JP2009156835A (en) * | 2007-12-28 | 2009-07-16 | Rohm Co Ltd | Current monitoring circuit and motor driving apparatus using this |
| CN103278733A (en) * | 2013-05-30 | 2013-09-04 | 孟津县电业公司 | Cable ground connection remote monitoring method and remote monitoring system |
| CN103578156A (en) * | 2013-11-08 | 2014-02-12 | 苏州康开电气有限公司 | Intelligent information acquisition system of electromechanical equipment |
| JP3191295U (en) * | 2014-02-03 | 2014-06-19 | 有限会社ベクトル | Current sensor |
| CN104251715A (en) * | 2013-06-27 | 2014-12-31 | 通用电气公司 | Systems and methods for shielding current transducers |
| CN204595536U (en) * | 2015-05-20 | 2015-08-26 | 国家电网公司 | A kind of quality of power supply of generating plant and internet electric energy real-time monitoring system |
| CN204945227U (en) * | 2015-09-11 | 2016-01-06 | 国网江西省电力公司赣东北供电分公司 | A kind of concentrator that uses carries out data collector |
| CN105699836A (en) * | 2016-03-29 | 2016-06-22 | 国网上海市电力公司 | Method for detecting grounding current of transformer core |
| GB201621000D0 (en) * | 2016-12-09 | 2017-01-25 | Haigh Group The Ltd | Device for monitoring an electrical apparatus |
| CN206450751U (en) * | 2017-02-28 | 2017-08-29 | 新疆心连心能源化工有限公司 | Monitoring system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7174261B2 (en) * | 2003-03-19 | 2007-02-06 | Power Measurement Ltd. | Power line sensors and systems incorporating same |
-
2017
- 2017-02-28 CN CN201710111838.1A patent/CN108508258B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000241466A (en) * | 1999-02-18 | 2000-09-08 | Hitachi Ltd | Small energy converter with split type current transformer |
| KR100721251B1 (en) * | 2005-12-02 | 2007-05-22 | 엘에스산전 주식회사 | Monitoring system of underground power line |
| JP2009156835A (en) * | 2007-12-28 | 2009-07-16 | Rohm Co Ltd | Current monitoring circuit and motor driving apparatus using this |
| CN103278733A (en) * | 2013-05-30 | 2013-09-04 | 孟津县电业公司 | Cable ground connection remote monitoring method and remote monitoring system |
| CN104251715A (en) * | 2013-06-27 | 2014-12-31 | 通用电气公司 | Systems and methods for shielding current transducers |
| CN103578156A (en) * | 2013-11-08 | 2014-02-12 | 苏州康开电气有限公司 | Intelligent information acquisition system of electromechanical equipment |
| JP3191295U (en) * | 2014-02-03 | 2014-06-19 | 有限会社ベクトル | Current sensor |
| CN204595536U (en) * | 2015-05-20 | 2015-08-26 | 国家电网公司 | A kind of quality of power supply of generating plant and internet electric energy real-time monitoring system |
| CN204945227U (en) * | 2015-09-11 | 2016-01-06 | 国网江西省电力公司赣东北供电分公司 | A kind of concentrator that uses carries out data collector |
| CN105699836A (en) * | 2016-03-29 | 2016-06-22 | 国网上海市电力公司 | Method for detecting grounding current of transformer core |
| GB201621000D0 (en) * | 2016-12-09 | 2017-01-25 | Haigh Group The Ltd | Device for monitoring an electrical apparatus |
| CN206450751U (en) * | 2017-02-28 | 2017-08-29 | 新疆心连心能源化工有限公司 | Monitoring system |
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